• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    position detection systems for use on touch screens and prismatic film used in them a dual light source position detection system is provided for use on touch screens that uses parallax to determine the position of an interposing object, and a prismatic film that is clearly retroreflective through a wide entry angle to optimize the accuracy of position parallax determination. the position detection system includes at least one camera positioned to receive light radiation passing through a detection area and which generates a signal representative of an image; two separate sources of light radiation, which can be leds or ir emitters positioned adjacent to the camera to emit radiation light radiation that covers at least a portion of a detection area, and a prismatic film positioned along a periphery of at least a portion of the detection area that retro reflects light radiation from the two sources to the camera. the prismatic film includes a plurality of retroreflective elements of a triangular cube corner that have dihedral angle errors e1, e2, and e3 such that e1 ~ e2 (different) 0 and e3 ~ 0 to improve the efficiency of the retroreflection of radiation from light from two separate leds or emitters to go along the sides of the detection area. if two cameras are mounted in opposite corners on the same side of the touchscreen and two sources of dual radiation are used in combination with these cameras, a clear determination can be made of the location of two objects simultaneously interposed.
    公开号:BR112012014042B1
    申请号:R112012014042-6
    申请日:2010-12-10
    公开日:2020-12-15
    发明作者:Steven R. Chapman；Simon Bridger
    申请人:Avery Dennison Corporation；Next Holding Ltd；
    IPC主号:
    专利说明:

    Cross Reference to Related Orders
    [001] This application claims the benefit of the Provisional Application of US 61 / 285,684 filed on December 11, 2009, and US 61 / 406,644 filed on October 26, 2010, which are incorporated herein in full by reference. Field of the Invention
    [002] The present invention generally relates to a system and method for detecting the position of an object within a touch screen or a position detection system and a retroreflective or prismatic film used in this way. More specifically, the invention relates to a low profile position detection system for use on touch screens or position detection systems that employ a large spacing between the source and the detector on the screen plane, and a prismatic film that it is clearly retroreflective at wider viewing angles, and across a wide range of entry angles. Description of the state of the art
    [003] Some position detection systems related to touch screens detect the interruption of radiation (for example, light) by means of an opaque interposing object (for example, a finger, pen etc. Such systems generally use radiation transmitters such as LEDs or IR emitters that are typically mounted in opposite corners on the same side of the touchscreen Each LED or IR emitter light source transmits a fan-shaped pattern in 90 ° of light across the field of touch screen, parallel to the surface of the field of view.
    [004] A retroreflective laminated metal material can be positioned around the perimeter of the touchscreen's active field, as disclosed in United States Patent No. 4,507,557. The retroreflective laminated metal material is generally arranged to reflect the light received from the LED light sources back towards the source source. The light incident on the front surface of the laminated metal falls on the retro-reflective elements, and is reflected back outwards through the front surface in a direction nominally 180 degrees with respect to the direction of incidence. Digital cameras are located in the same opposite corners where the LED light sources are mounted to detect the reflected retro light that passes through the touchscreen field and detects the existence of any interruption in this radiation by an opaque object.
    [005] A problem with the use of certain retroreflective laminated metal materials, conventional in touchscreen applications and / or position detection systems, is that dirt and / or moisture can penetrate the structure and adversely affect the retroreflectivity of the retroreflective laminated metal material. Another problem with conventional retroreflective laminated metal material used in touchscreen applications and / or position detection systems is the difficulty in obtaining a uniform background across the area of interest (for example, the detection area ), against which the opaque object can be contrasted. Many conventional models of retroreflective laminated metal material provide a non-uniform background and have portions, especially in or near corner regions where the detected signal is very weak. This makes it difficult to detect the movement of the opaque object in such areas.
    [006] In operation, the position of the interposing object is typically determined by triangulation. When an interposing object such as a fingertip interrupts the pattern of light beams radiated from LED light sources or IR emitters, a discrete shadow is created along a horizontal axis in the pattern of the reflected reflected light received by the two digital cameras. Each of the digital cameras generates a signal in which the discrete shadow aligns as an intensity of depression in light along a point on the horizontal axis of the camera's field of view. A digital control circuit receives these signals from the digital camera and converts the horizontal position of the shadow into angles θi, θ2 whose vertex originates with digital cameras. As digital cameras are separated by a known distance D at opposite ends of the same side of the touchscreen, the intervening object's y coordinate can be computed by the digital control circuit using the formula y = D / (1 / tan θ1 + 1 / tan θ2), and the x coordinate can be computed as x = y (1 / tan θ1). Brief Summary of the Invention
    [007] The embodiments of the present invention described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description. More specifically, the modalities are chosen and described so that others skilled in the art can consider and understand the principles and practices of the present invention.
    [008] Although such previous touchscreen configurations are generally suitable for their intended purpose, the applicant noted that such touchscreen configurations can reliably detect only a single touch at a time. A double tap will produce two depressions in each digital signal, one for each object. As it may not be clear which depression in the second camera signal corresponds to a certain depression in the first camera signal, the resulting signal data can be ambiguous, making it impossible to determine with certainty the coordinate location of the two interposing objects.
    [009] A first aspect of the invention is the placement of both, source and detector, on the plane of the touchscreen. This allows the size of the camera perpendicular to the plane of the screen to be minimized. The location of the font along the camera's longitudinal axis also maximizes parallax effects.
    [0010] A second aspect of the invention relates to a position detection system having cameras that use parallax to determine if the position of an interposing object is clear. For this purpose, the position detection system comprises a camera positioned to receive electromagnetic radiation through a detection area that generates a signal representative of an image; two spaced sources of electromagnetic radiation, positioned adjacent to the camera to produce electromagnetic radiation that overlaps at least a portion of a detection area, and a prismatic film positioned along a periphery of at least a portion of the reflecting detection area backwards the electromagnetic radiation from the two sources to the camera. In such a configuration, the camera generates a double image of any opaque object, interposed in the detection area, which in turn allows a digital processor to perform a parallax-based computation of the location of an object in the detection area based on the angle and distance to the object from the camera lens. If two cameras are mounted in opposite corners on the same side of the touchscreen and two sources of dual radiation are used in combination with these cameras, a clear determination can be made of the location of two objects simultaneously interposed. Alternatively, if only a single touch capability is desired, then only a single camera in combination with a dual radiation source is required.
    [0011] The applicant further noted that the retroreflective properties of the prismatic films of the prior art limit the accuracy of parallax-based location computation. The accuracy of such computations increases with the separation distance between two sources of electromagnetic radiation. However, prior art prismatic films have a limited range of viewing angles for efficient retroreflection. Consequently, the further apart the two sources are, the darker or more blurred one or the other, or both, the parallax images become, and the smaller the signal / noise ratio becomes.
    [0012] Consequently, a third aspect of the invention is the provision of a prismatic film that is clearly retroreflective through an unusually wide range of viewing angles along the horizontal axis of the film. To that end, the prismatic film of the invention includes a plurality of triangular cube corner retroreflective elements having dihedral angle errors e1, e2 and e3 such that ei ~ e2 ^ 0 and e3 ~ 0. Preferably, | ei | and | e | are between approximately 0.02 ° and 0.20 °. Approximately half of the plurality of triangular cube corner retroreflective elements may have ei and e2 dihedral angle errors between approximately 0.02 ° and 0.20 °, and the remaining half of the plurality of triangular cube corner retroreflective elements have errors of dihedral angle ei and e2 between approximately -0.02 ° and -0.20 °. In addition, the triangular cube corner elements may have a more parallel sloping edge between approximately 80 ° and 20 °. Finally, to further improve retroreflectivity over a wide range of entry angles, the prismatic film can include a metallized layer arranged over at least a portion of the retroreflective substrate.
    [0013] In a still further aspect of the present invention, a prismatic film is described and includes a prismatic film that has a retroreflective substrate including a plurality of triangular cube corner retroreflective elements; and where the reflected retro light pattern has a greater horizontal dispersion than a vertical dispersion at the 0 ° and 60 ° entry angles. In addition, the dispersion in the horizontal direction is 1.5 times greater than in the vertical direction.
    [0014] A prismatic film in one or more of the previous modes in which the triangular cube corner elements are inclined between -10 ° and -6 ° and in an additional mode between -15 ° and -6 °.
    [0015] In a further exemplary embodiment of the present invention, a detached prismatic film includes a prismatic film that has a retroreflective substrate including a plurality of triangular cube corner retroreflective elements. The retroreflective cube corner elements have dihedral angle errors e1, e2, and e3 such that ei ~ e2 ^ 0 and e3 ~ 0, in which the various triangular cube corner elements are inclined between -10 ° and -6 °.
    [00i6] Other features and advantages of the present invention will become apparent to those skilled in the art from the following detailed description. It should be understood, however, that the detailed description of the various specific embodiments and examples, while indicating preferred embodiments and other embodiments of the present invention, is provided by way of illustration only and not limitation. Many changes and modifications within the scope of the present invention can be made without departing from its essence, and the invention includes all such modifications. Brief Description of Drawings
    [0017] These, as well as other objectives and advantages of this invention, will become more fully understood and considered by reference to the following more detailed description of the presently preferred exemplary embodiments of the invention in conjunction with the accompanying drawings, of which: Figure 1 is a schematic view of a touch screen system according to the aspects of the present invention; Figure 2 is a cross-sectional view of the touch screen system of Figure 1 according to the present invention; Figures, 3 and 4, are seen in cross-section of prismatic film modalities according to the present invention; Figure 3a is a cross-sectional view of a prismatic film embodiment according to the present invention; Figure 5 is a plan view of the prismatic film with an arrangement of inclined cube corner retroreflective elements as shown in Figures 3 and 4; Figure 6 is a plan view of an exemplary tilted cube corner retroreflective structure according to aspects of the present invention; Figure 7 is a plan view of prismatic film detached from retroreflective elements of angled cube corner as shown in Figure 6; Figure 8 is a cross-sectional view of Figure 5 taken along line 9-9; Figure 9 illustrates the dihedral angle errors e1, e2, e3 present on the faces of the cube corners of the invention; Figures 10A-10H are diagrams of conventional tipped cube corner points with more parallel edges at 0 °, 16 ° and -8 ° for entry angles (beta) of 0 ° and 60 °; Figures 11A-11D are diagrams of cube corner points of the invention with an inclined edge more parallel at 0 ° and 16 ° for entry angles (beta) of 0 ° and 60 °; Figures 12A, 12C, 12E, 13A, 13C, 13E are simulated light return patterns generated by the inclined edge of conventional cube corners more parallel at 0 ° and 16 ° for entry angles (beta) of 0 °, 60 ° and -8 °; Figures 12B, 12D, 12F, 13B, 13D, 13F are simulated light return patterns generated by anomalous cube corners according to the example of the slant edge of the invention more parallel at 0 ° and 16 ° for entry angles ( beta) 0 °, 60 ° and -8 °; and Figure 14 is an exemplary camera signal graph for different screen sizes having an aspect ratio of 16/9. Detailed Description of the Invention
    [0018] The present invention is now illustrated in greater detail by means of the following detailed description which represents the best currently known way of carrying out the invention. However, it should be understood that this description should not be used to limit the present invention, but rather is provided for the purpose of illustrating the general features of the invention.
    [0019] A disadvantage of using prism arrangements with positive inclination on a touchscreen is the phenomenon of "flickering". At certain entry angles, light from the LED can enter the prismatic film, reject from just two of the cube corner faces and return to the opening of the camera. This creates a sharp "spike" in the camera signal at that specific angle.
    [0020] The presence of "spikes" in the camera signal is undesirable. Thus, for many applications, it is desirable to choose an inclination for which flicker only occurs at entry angles not seen in the touchscreen geometry. Typical touch screens see entry angles varying up to approximately 60 °. The following graphic shows the location of the flickers for touch screens with the retroreflective strip perpendicular to the plane of the screen. For slopes of + 7 ° and + 15.5 °, the location of the scintillations can be found: 45 ° and 30 °, respectively. It can be seen that no flicker occurs for the input angles of interest (0 ° - 60 °), if the inclination varies from approximately -19 ° to -0.5 °. In a similar way, prisms with an inclination = + 15.5 ° provide flicker at an entry angle of approximately 30 °.
    [0021] If the retroreflective film is slightly angled, so that it is no longer perpendicular to the plane of the touchscreen, the location of the flicker may change somewhat. To illustrate this, the following graph shows the retroreflective efficiency of triangular cube corners with various inclinations, as a function of the entry angle (β) and orientation angle (®s). White coated are the angles at which "flicker" will occur. Coated in black are the angles found in the touch screen geometry. The four black lines correspond to the different inclinations of the retroreflective film (-30 °, -10 °, 10 °, 30 °). The graphs show that avoiding flicker in the case of an inclined retroreflector requires a narrower range of inclinations. For example, a touch screen with a reflective retro film tilted at 10 ° will prevent flickering if the inclination varies from approximately -15 ° to approximately 0 °.
    [0022] United States Patent 4,588,258 to Hoopman discloses retroreflective articles having a generally negative inclination producing wide angularity, when using sets of pairs combined with the hub axes of the cubes in each pair being tilted towards each other.
    [0023] For the purposes of this application, certain terms are used in a specific sense as defined here and other terms in accordance with industry practice, such as current ASTM definitions, for example.
    [0024] United States patent application, serial number 12 / 351,913, entitled "Retroreflector for use in touch screen applications and position sensing systems" filed on January 12, 2009 (having a common inventor and assigned to the same assignee who the present application) is hereby incorporated by reference as necessary for a complete understanding of the present invention.
    [0025] The term "cube" or "cube corner elements" (also "cube corner prisms" or "cube corners" or "cube corner retroreflective elements"), as used herein, includes those elements consisting of on three faces that cross each other, whose dihedral angles are generally in the order of 90 °, but not necessarily exactly 90 °.
    [0026] The term "cube shape" as used here means the two-dimensional geometric figure defined by the projection of the cube perimeter in the direction of the refracted main radius. For example, a triangular cube has a cube shape that is a triangle.
    [0027] The term "dihedral angle error" as used here refers to the difference between the effective dihedral angle and 90 degrees. Each cube corner element has three dihedral angle errors, e1, e2 and e3. For an inclined cube corner with a cube shape that is an isosceles triangle, we adopted a convention whereby the e3 label is assigned to the dihedral angle between the two faces with the same (but inverted) shape.
    [0028] The term "retroreflective substrate" as used herein means a thickness of a material having an arrangement of corner elements of cube, male or female, formed on a second surface thereof. The first surface may be flat, or it may be otherwise irregular in a pattern generally corresponding to the arrangement of cube corner elements on the rear surface. For male cube corner elements, the term "substrate thickness" means the thickness of the material on which the cube corner elements rest. For female cube corner elements, the term "retroreflective substrate thickness" means the total thickness of the material in which the female cube corner elements form cavities.
    [0029] The term "cube axis" as used here means a central axis which is the tri-sector of the internal space defined by the three intersecting faces of a cube corner element. The term "inclined cube corner" as used herein means a cube corner having its axis not perpendicular to the laminated metal surface. The slope is measured as the angle between the hub axis and the normal of the rolled metal surface. It is observed that when there is inclination, a plan view perpendicular to the laminated metal surface shows the face angles at the apex not all at 120 degrees.
    [0030] The term "input angle" as used here means the angle between the lighting axis and the optical axis (retroreflector axis). The entry angle is measured between the incident radius and the retroreflector axis. The entry angle is a measure only of the amount by which an incident radius is tilted in relation to the retroreflector axis and does not refer to its normal.
    [0031] The term "more parallel face slope" (or "slanted in a more parallel face direction" or "slanted in a more parallel face direction") and "more parallel edge slope" as used herein refers to the cube positioning in relation to the main refracted radius. When the angles between the cube faces and the main refracted radius are not all 35, 36 °, the cube has a "more parallel face" or "more parallel edge" depending on whether the angle face with respect to the radius main refracted which is more different than 35.26 ° is respectively greater or less than 35.26 °. In the case of rolled metal or other retroreflectors for which the main refracted radius is nominally perpendicular to the front surface of the retroreflector, then for cubes with a more parallel face the selected cube face will also be more parallel to the front surface of the reflector than any face of a non-tilted cube.
    [0032] An exemplary position detection system 100 according to the aspects of the present invention is illustrated in Figure 1. Figure 1 illustrates a plan view of a display 102 (for example, a computer display, a touchscreen display) touch, etc.) having a screen area or field of view 104 surrounded by a raised frame or border 106. Although shown in the context of a computer display, the position detection system 100 can be used in any type of optical position detection system. The inner surface of the edge 106, which is generally substantially perpendicular to the field of view 104 of the display screen 102, is provided with a prismatic film (also referred to herein as retroreflective film 108). The prismatic film 108, which is discussed in detail below, provides a retroreflective surface around at least a portion of the field of view 104 (also referred to here as a detection field). That is, the prismatic film 108 provides a surface that reflects radiation from a source radiation source back to the source source.
    [0033] The composition of the prismatic film 108 can be applied directly to the frame 106 using an adhesive or other fixing means, or it can be manufactured first in the form of an adhesive tape, which is subsequently applied to the inner surface of the edge 106. It is desirable to align the prismatic film in such a way that a plane of maximum input angularity associated with the prismatic film is substantially parallel to the field of view, the field of detection and / or the display to optimize possible detection of an object in the area of interest. As discussed more fully below, the prismatic film 108 comprises a retroreflective film having multiple layers, one of which includes a plurality of triangular cube corner retroreflective elements that reflect the incoming radiation. In an alternative embodiment, the film may include only a single layer that includes a plurality of retroreflective triangular cube corner elements. Triangular cube corners can have a negative slope ranging from -10 ° to -6 °.
    [0034] The embodiments of the present invention described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description. More specifically, the modalities are chosen and described so that others skilled in the art can consider and understand the principles and practices of the present invention.
    [0035] The position detection system 100 shown in Figure 1 further includes two dual radiation sources 110, 112, each of which includes two separate point sources (or substantially point sources) 111a, 111b and 113a, 113b. The first source of dual radiation 110 can be arranged in one corner of the field of view 104 and the second source 112 can be arranged in another corner of the field of view 104. In a preferred embodiment, the first source and the second source of dual radiation 110, 112 are mounted along the same side 114. As shown in Figure 1, side 114 may not be provided with prismatic film 108, which is provided on the other three sides of display 102. Those of ordinary skill in the art will readily consider that the exact location of the dual radiation sources 110, 112 may vary depending on a variety of model considerations, including environment, application, etc. Similarly, those of ordinary skill in the art will consider that the entire perimeter of the field of view can be enveloped by the prismatic film 108.
    [0036] Dual radiation sources 110, 112 together illuminate the entire field of view 104 with radiation, which extends in a direction parallel to the plane of field of view 104. Dual radiation sources can provide any desirable spectrum of radiation electromagnetic. That is, the radiation sources can be selected to operate in any desired frequency range or any desired wavelength. For example, the sources can be a source of infrared radiation, radio frequency radiation, visible light radiation, light emitting diode (LED), laser, IR emitter, etc. In a preferred embodiment, point sources 111a, 111b and 113a, 113b of dual radiation sources 110, 112 are infrared light emitting diodes.
    [0037] The prismatic film 108 provided around the perimeter of the field of view reflects the infrared radiation back towards the respective source sources as indicated by the arrows within the field of view. Thus, for example, dual infrared radiation rays originating from point sources 111a, 111b of source 110 extend outwardly to the side of the display screen and are reflected 180 ° to return to source 110; as shown in Figure 1. Electromagnetic radiation is reflected backwards towards its source by the prismatic film 108. One or more of the layers that overlap the triangular cube corner elements of the prismatic film 108 work to allow for the greatest part of the infrared radiation through (for example, a double-pass transmission of approximately 74% to approximately 100%) and substantially block visible light, which gives the film an appearance of darkness. These aspects of the invention will be discussed further below.
    [0038] Point sources 111a, 111b and 113a, 113b of dual radiation sources 110, 112 are arranged symmetrically along a horizontal axis H1 on either side of lenses 115 and 116, respectively (as shown in Figure 2), for reasons that will become evident afterwards. The H1 axis is coplanar with the longitudinal axis H2 of the prismatic film 108. The lenses 115 and 116 are additionally arranged in front of cameras 117, 118, respectively. Lenses 115 and 116 focus the retro radiation reflected on an image capture device from cameras 117 and 118. Point sources 111a, 111b and 113a, 113b are positioned at a distance x distant from lenses 115, 116 as shown in Figure 2 In the preferred embodiment, the distance x is preferably between approximately 1 and 6 millimeters for touch screens whose longest side ranges from approximately 17 to 30 inches for reasons discussed in detail below. More preferably, the distance x is between approximately 2 and 4 millimeters for touch screens of such sizes. Cameras 117, 118 can be line scan cameras and / or area scan cameras. The image capture device of cameras 117, 118 can include a charge-coupled device sensor (CCD) that is formed by an array of photosensitive elements (e.g., pixels). A line-scan camera usually acquires an image on a single line of pixels. An area-scanning camera, like a conventional camera, includes a pixel CCD sensor (usually rectangular in shape) that generates two dimensional frames corresponding to the length and width of the acquired image. The reflected radiation passes through the corresponding lenses (for example, lens 115 or lens 116, depending on the location of the irradiation source) and forms an image of an object detected by the CCD sensor. The CCD sensor converts the detected radiation in a photodiode array into an electrical signal and emits the measured quantity. A single scan line from a line scan camera can generally be thought of as a one-dimensional mapping of the brightness related to each single point on an observed line. A linear scan generates a line, showing on the y-axis the clarity of each point provided in gray levels (for example, from 0 to 255 levels for an 8-bit CCD sensor or from 0 to 1023 for a 10-bit CCD sensor ). The outputs from cameras 117, 118 can be processed by a control unit 119. Control unit 119 includes a digital processor that processes the output signals received from the cameras into signals indicative of the x and y coordinate position of object 109 via of a parallax algorithm. Those of ordinary skill in the art will readily consider that a scan performed from an area camera will generate a two-dimensional mapping of the brightness related to each point in the observed area.
    [0039] The operation of the position detection system 100 is best understood with reference to Figures 1 and 2, which will be explained first with reference to the dual radiation source 110. The dual radiation source 110 emits two radiation beams infrared from its pair of point sources 111a, 111b. Field of view 104 has a prismatic film 108 along three sides of frame 106, in which both point sources 111a, 111b are directed. The two different beams of infrared radiation generated by point sources 111a, 111b hit an object 109, interposed within the field of view 104 at different angles due to its 2x displacement from each other, creating two shadows of object 109 located in either from the sides of the object 109. The two beams of infrared radiation reaching the prismatic film 108 are reflected back to the line scan camera 117. Infrared radiation passes through lens 115 to the line scan camera 117, which by it in turn focuses an image on the camera's CCD that includes an image of the interposing object 109 and the shadows flanking it.
    [0040] The total separation between object 109 and the shadows flanking it along the horizontal axis H1 is linearly proportional to the distance between object 109 and the point light sources 111a, 111b, being greater when object 109 is closer to the spot light sources 111a, 111b and smaller when object 109 is further away. The value of the separation distance from the flank shadows is also proportional to the 2x distance between the point light sources 111a, 111b. The distance between object 109 and the front of lens 115 can be accurately computed if the distance 2x is known through a parallax algorithm from the amount of separation observed between object 109 and its flank shadows. The proportional line scan camera generates a corresponding line image that corresponds to the image along the longitudinal axis H2 of the prismatic film 108, having a digitized clarity value that depends on the resolution of the line scan camera for the various points along from the scanner line. For any position in the line image that does not receive radiation, a logic value of 0 is generated. For example, if an opaque object 109, such as a pen or human finger, enters the field of view, a shadow is cast over the lens and the corresponding line-scan camera, which results in very little or no charge being detected by the line scan camera for that specific pixel or pixel area. Where radiation is detected, the radiation discharges a corresponding CCD sensor associated with the line scan camera, which generates a substantially higher signal value depending on the line scan camera resolution. The combination of the image of object 109, with the shadow of its flank, generates a depression or trough in the image signal generated by camera 117 (or even three discrete depressions or troughs) whose amplitude along the H2 axis can be converted into a distance between object 109 and point radiation sources 111a, 111b by the digital processor of control circuit 119 via a parallax algorithm (or a lookup table generated by such an algorithm). In addition, the angle θi can be determined by the digital control circuit processor 119 from the location of the depression midpoint (or group of depressions) along the horizontal axis of the CCD of the camera ii7. Therefore, the location of a single interposing object i09 can be completely determined by a single camera ii7 in combination with the dual radiation source ii0 and the digital processor of the control circuit ii9. Although the determination can initially be in polar coordinates, the conversion to Cartesian X, Y coordinates is easily implemented. In addition, if a combination of two sources of dual radiation ii0, ii2 and line scan cameras ii7, ii8 is provided, as shown in Figure i, and operated simultaneously, then the X and Y position of two interposing objects can simultaneously be determined clearly, since only a combination of a camera and dual light source is needed to determine the X, Y coordinates of a single interposing object.
    [004i] The prismatic film (also referred to here as the retroreflective film) i08 will be discussed now. With reference to Figure 3, an exemplary prismatic film i08 according to aspects of the present invention is illustrated in the cross-sectional view. The prismatic film i08 includes a first substrate i20 that has a first surface i22 and a second surface i24. The first surface i22 (also referred to as the front surface) of the prismatic film i08 is generally flat (and typically smooth). The second surface 124 is also generally flat and is attached to a second substrate 126.
    [0042] The second substrate 126 has a first surface 128 and a second surface 130. As shown in Figure 3, the first surface 128 of the second substrate 126 is generally flat (and typically smooth) and generally confronts the second surface 124 of the first substrate 120. The second surface 130 of the second substrate 126 is also generally flat and is attached to a retroreflective substrate 132.
    [0043] The first and second substrate 120, 126 can be comprised of a material, such as a polymer that has a high modulus of elasticity. The polymer can be selected from a wide variety of polymers, including, but not limited to, polycarbonates, polyesters, polystyrenes, polyarylates, styrene-acrylonitrile copolymers, urethane, acrylic acid esters, cellulose esters, ethylenically unsaturated nitrites, epoxy acrylates hard, acrylics and the like, polycarbonate and acrylic polymers being preferred. Preferably, the first and second substrates are colored and / or have an evenly distributed ink over the first, and second, substrates. In one embodiment, the first substrate 120 has a red ink distributed over it and the second substrate 126 has a blue ink distributed over it. In another embodiment, the first substrate 120 has a blue ink distributed over it and the second substrate 126 has a red ink distributed over it. The first, and the second, substrates 120 and 126 have ink distributed evenly over all of them. Those of ordinary skill in the art will readily consider that aspects of the present invention include the use of any desirable color, or combination of colors, to achieve the desired functionality, aesthetic appearance, etc., discussed here. For example, substrates 120, 126 can have different colored inks distributed completely over them. See, for example, United States published applications 20030203211 and 20030203212 (assigned to the same assignee as the present application) which are hereby incorporated by reference as is necessary for a complete understanding of the present invention.
    [0044] The substrates are preferably chosen to be highly transparent at infrared wavelengths and non-transparent at visible light wavelengths, which will provide a substantially black appearance. The clear second plane provided by the film is preferably made so that it is clear and uniform, as reasonably possible, to allow the detection of an object 109 within the field of the prismatic film 108 (for example, the field of view 104).
    [0045] The retroreflective substrate 132 has a first surface 134 and a second surface 136. As shown in Figure 3, the first surface 134 is generally flat (and typically smooth) and generally confronts the second surface 130 of the second substrate 126. The second surface 136 includes, or otherwise defines, a plurality of cube corner retroreflective elements 140 and can be faced with an adhesive 143 for use in an application. The retroreflective substrate 132, including the cube corner elements 140 formed there, can be comprised of a transparent plastic material, such as a polymer that has a high modulus of elasticity. The polymer can be selected from a wide variety of polymers, including, but not limited to, polycarbonates, polyesters, polystyrenes, polyarylates, styrene-acrylonitrile copolymers, urethane, acrylic acid esters, cellulose esters, ethylenically unsaturated nitrites, acrylates and hard epoxy, acrylic, and the like, with polycarbonate and acrylic polymers being preferred.
    [0046] The prismatic film of Figure 3a provides a signal layer film as opposed to the multilayer film as provided in Figures 3 and 4. For convenience, similar reference numerals are used in describing the embodiment of Figure 3a. An exemplary prismatic film 108 according to aspects of the present invention is illustrated in the cross-sectional view. The retroreflective substrate 132 has a first surface 134 and a second surface 136. As shown in Figure 3a, the first surface 134 is generally flat (and typically smooth). The second surface 136 includes, or otherwise defines, a plurality of cube corner retroreflective elements 140, and can be faced with an adhesive 143 for use in an application. The retroreflective substrate 132, including the cube corner elements 140 formed there, can be comprised of a transparent plastic material, such as a polymer that has a high modulus of elasticity.
    [0047] In another embodiment illustrated in Figure 4, the first and second substrate 120, 126 can be replaced by a single substrate 150. Substrate 150 has a single layer of paint to absorb visible light with a front surface 152 and an opposite posterior surface 154. The posterior surface 154 confronts the retro-reflective substrate 132, as discussed above with respect to the second substrate. The front surface 152 is generally smooth. In one embodiment, substrate 150 is black in color. The benefits associated with a single layer of paint are that of making the total film structure thinner and increasing the uniformity of transmission through the single layer of paint 150.
    [0048] In a preferred embodiment, the retroreflective substrate 132, including the cube corner elements formed there, is made of acrylic, for example, an acrylic material having a refractive index of approximately 1.49. Of course, other suitable materials having a higher or lower refractive index can be employed without departing from the scope of the present invention. The cube corner elements can be formed within, or as an integral part of the substrate using, for example, any of the methods described in United States Patents 6,015,214 (RE 40,700) and 6,767,102 (RE 40,455) (assigned to the same assignee of the present application) which are incorporated herein by reference as necessary for a complete understanding of the present invention.
    [0049] As more fully described below, the substrate refractive index, the size and slope of the cube corner elements can be selected to provide the desired retro-reflectivity and uniformity. Although the present invention is being described with respect to cube corner elements that are formed integrally as part of the substrate, it should be considered that the present invention is applicable to cube corner elements that are formed separately (for example, by casting) or molding) from the substrate and attached to the substrate.
    [0050] The various cube corner elements 140 are metallized 142, with a suitable metal, such as aluminum, silver, nickel, gold or the like. Such metallization can be provided by depositing (for example, sputtering or vacuum deposition) a metal film on the surfaces of the cube corner elements. The metalized cube corner side of the substrate can be coated with, or otherwise embedded in, an adhesive 143 (forming, for example, a conspicuous tape-like product). The metallization of the cube corner elements allows the display to be cleaned and otherwise not subject to contaminants and / or moisture that could have detrimental effects on the retro-reflective film 108. United States Patent 7,445,347 (assigned to same assignee of the present application) is hereby incorporated by reference as necessary for a complete understanding of the present invention.
    [0051] Referring now to Figures 5-8 and continuing with reference to Figure 3, the retroreflective film 108 includes a plurality of individual cube corner elements 140 (Figure 3) that are arranged in, or otherwise formed as, a arrangement 200 (Figure 5. Each cube corner element 140 is formed by three faces substantially, but not completely perpendicular 202 that meet at an apex 204. The faces intersect at the dihedral edges 206. The angles at the dihedral edges 206, between the mutually crossed faces 202 are commonly referred to as dihedral angles. In a geometrically perfect cube corner element, each of the three dihedral angles is exactly 90 °. However, in the present invention, a specific error pattern is deliberately incorporated into two of the three dihedral angles to improve the clarity of the retro-detected radiation reflected along the longitudinal axis of the prismatic film 108, as will be described in detail below. lead.
    [0052] As shown in Figure 6, each cube corner element 140 has a triangular cube shape with three base edges 210. In the present embodiment, each cube corner element 140 has an isosceles cube shape, where two of the base edges (for example, base edges having lengths a and b) are approximately the same length. Alternatively, one or more of the cube corner elements 140 may have a non-isosceles triangular cube shape. As the base edges 210 of the cube corner element 140 are linear and in a common plane, an arrangement of them is defined by intersecting sets of grooves. As shown in Figure 5, each cube corner element 140 is defined by three V-shaped grooves 212, 214, 216 which are individually a member of three sets of grooves that cross arrangement 200 in an intersecting pattern to form combined pairs of cube corner elements. Normally all three sets of grooves are cut to the same depth, but one or more sets of grooves can be vertically offset (that is, cut shallower or deeper with respect to the others). In addition, one of the groove sets can be moved horizontally, making the cube shape different from a triangle. Such cubes are still considered triangular cube corners and are within the scope of this invention. In the embodiment illustrated in Figure 6, faces adjacent to sides a and b have a groove semi-angle of approximately 38.5 degrees (for example, 38.5211 degrees), while the face adjacent to side c has a groove semi-angle of approximately 28.3 degrees (for example, 28.2639 degrees).
    [0053] Arrangement 200 can be replicated several times, for example, in approximately square tiles of a desired size. In the preferred embodiment, such tiles
    [0054] are provided in a linear arrangement as shown in Figure 7 whose longitudinal axis corresponds to the longitudinal axis of the film strip 108 arranged around the edge 106 of the position detection system 100 shown in Figure 1. Metal laminated with a tile or multiple tiles all having the same cube corner orientation are referred to as unfixed metal laminates.
    [0055] In prismatic films, a cube corner element is generally used with at least one other cube corner element as part of a combined pair and is commonly used with an arrangement of such elements. Such an arrangement is shown in Figures 5-7, and such a combined pair is shown in cross section in Figure 8. The cube corner elements illustrated in Figures 6 and 8 and repeated in the arrangements in Figures 5 and 7 are preferably angled in the direction of most parallel edge between approximately 8 ° and 24 °, and are most preferably inclined towards the most parallel edge between approximately 12 ° and 20 °. In an additional exemplary mode, the triangular cube corner elements are inclined between -10 ° and -6 ° and in another mode between -15 ° and -6 °. In the previous exemplary embodiments, each cube corner element is tilted in the direction of the most parallel edge 15.5 °. In addition, each cube corner element preferably has a cube depth between approximately 0.006 and 0.0055 and more preferably 0.002 and 0.0045 inches. In this exemplary embodiment, each cube corner element has a cube depth of 0.00325 inches.
    [0056] As discussed above, an aspect of the present invention relates to the provision of a retroreflective film that has a high clarity value. Consequently, highly reflective prismatic laminated metal is used to achieve this goal. However, the choice of prismatic laminated metal potentially compromises the desire for uniformity. The geometry of a typical touchscreen display is such that the entry angles range from 0 to 60 degrees. Those of ordinary skill in the art will readily consider this to be a very wide range through which to maintain uniform clarity with prismatic laminated metal. As the viewing angles also vary, specific care must be taken when selecting the geometry and size of the cube to obtain a combination of high clarity and good uniformity.
    [0057] For laminated, prismatic metal applications, triangular cube corner prisms are most commonly used, because they can be directly machined on a substrate using predominant or conventional diamond turning techniques. An algorithm was developed to simulate signal clarity and uniformity as a function of geometry and size for isosceles triangular cube corners cut with equal groove depths. For these cube corners, geometry and size are completely determined by two parameters: cube slope, and cube depth. Those of ordinary skill in the art will readily consider that other types of triangular cube corners are possible including, for example, scalene triangles and two-tier or three-tier cutting of the groove sets. In such cases, it is not the combination of cube inclination / cube depth itself that determines the clarity and uniformity of the signal, but rather the active opening size of each incident light direction.
    [0058] The applicant has found that the clarity of the image of an interposing member 109, and the flank shadows generated by the dual radiation sources 110, 112 can be improved if errors e1, e2 and e3 of a specific pattern are deliberately incorporated at dihedral angles normally 90 ° between the faces of the cube corners.
    [0059] The error pattern e1, e2 and e3; that forms part of that invention; it is best understood with reference to Figure 9, which illustrates a single cube corner element having three triangular faces 202a, 202b and 202c. As explained with reference to Figure 6, these faces 202a, 202b and 202c intersect to form three substantially dihedral edges 206 and three substantially dihedral angles e1, e2 and e3 representing the angles between faces 202b, 202c; 202a, 202c and 202a, 202b, respectively. In the cube corners of the invention, each of the dihedral angles includes a pattern of errors or divergences e1, e2 and e3 from the ideal 90 ° value such that ei ~ e2 and e3 ~ 0. Preferably, | ei | and | e | are> 0.033 ° (or 2 minutes) and | e3 | <0.033 ° (or 2 minutes). More preferably, | hey | and | e2 | they are between approximately 0.035 ° and 0, 10 °, and between approximately 0.03 ° and 0.20 ° and | e3 | is approximately 0 °. In the preferred embodiment, | ei | and | e2 | are both 0.063 ° (or 3.8 minutes) while | e3 | is 0 °. In a still preferred embodiment, ei and e2 ± 0; (e1 + e2) / 2> 0.03 ° and even more preferably (e1 + e2) / 2> 0.05 °. In an additional embodiment, e3 <0.03 ° and more preferably, where e3 <0.015 °. In an additional modality, | e1 - e2 | <0.06 ° and more preferably | e1 - e2 | <0.03 °.
    [0060] One way in which such error adjustment can be obtained is by cutting the V-grooves that form the opposite faces 202c of cube corner elements, adjacent at an angle that has the effect of either increasing or decreasing the angles dihedral by 0.063 °. These V-grooves correspond to the horizontal V-grooves of the cube corner arrangement illustrated in Figures 5 and 7. However, such a technique would provide all cube corners with an error pattern having the same sign, that is, e1 and e2 would all be , or positive, or negative, and the applicant noted that the inclusion of both positive and negative adjustments of errors would advantageously reduce the sensitivity of the film's performance to variations in the dihedral angles that could arise during the manufacturing process. One method of obtaining positive and negative adjustments for dihedral angle errors is as follows. The cutter used to cut the horizontal grooves along the short sides of the triangles illustrated in Figures 5 and 7 is tilted in one direction. This causes an increase in e1 and e2 in the cube corner elements on one side of the cutter, and a corresponding decrease in e1 and e2 in the cube corner elements on the other side of the cutter. This slanted cutter is used to cut alternating grooves. Then the substrate is rotated 180 ° and the missing grooves are cut. This provides the resulting cube corner arrangement with alternating rows of cube corners where e1 and e2 are + 0.063 ° and -0.063 °, respectively.
    [0061] A comparison of the point diagrams illustrated in Figures 10A-10H with those of Figures 11A-11D illustrates that an arrangement of cube corners inclined at 0 °, 16 ° and -8 ° from a more parallel edge and having the pattern of error e1, e2, and e3 of the invention advantageously contains the dispersion of light as much as possible within the plane of the touchscreen. When a cube corner is exposed to a point light source, each of the three faces of the cube corner generates two reflected back points as a result of the fact that part of the reflected light from each face is reflected from each of the other two cube faces. Figures 10A-10H are diagrams of conventional cube corner points inclined at 0 ° and 60 ° for entry angles (beta) of 0 ° and 60 °, where all the dihedral angles are 90 ° (that is, e1 = e2 = e3 = 0 °). Figures 10A-10H illustrate that, for all combinations of tilt and entry angle, all six retro-reflected points from the cube corner surfaces are accurately reflected back 180 ° back to the point light source in such a way that they all converge on the same x, y coordinates. In comparison, as illustrated by Figures 11A-11D, when a pattern of dihedral angle errors e1 = 6 min, e2 = 6 min and e3 = 0 is introduced into the cube corners, the three faces of the non-retro cube corners reflect the six points exactly 180 ° with respect to the point source, but instead retro reflect four of the six points at diverging points (approximately 0.4 °) along the x axis. The remaining two points are more compacted towards the x-axis when the cube tilt = 16 °. As the x-axis corresponds to the plane of the touch screen, Figures 11A-11D illustrate that the cube corners incorporating the tilt and the dihedral angle error pattern of the invention advantageously contain the dispersion and light as much as possible within the plane of the touch screen.
    [0062] Figures 12A-12F and 13A-13F represent the anticipated retro reflected patterns of light when diffraction is considered. Figures 12A, 12C, 12E, 13A, 13C, 13E are light pattern diagrams for conventional cube corners angled at 0 ° and 60 ° for entry angles (beta) of 0 ° and 60 °, where all angles dihedral are 90 ° (that is, e1 = e2 = e3 = 0 °). Figures 12B, 12D, 12F, 13B, 13D, 13F illustrate the differences in the light pattern diagrams of such cube corners when a dihedral angle error pattern e1 = 6 min. e2 = 6 min. and e3 = 0 is entered in them. In general, the reflected retro light is more concentrated along the x-axis, as seen best with respect to Figures 13B, 13D, 13F. A comparison of these diagrams confirms the conclusions reached with respect to Figures 10A-11D and Figures 11A-11D, that is, that the cube corners incorporating the inclination and the dihedral angle error pattern of the invention advantageously contain the dispersion of light as much as possible within the plane of the touchscreen.
    [0063] As provided in Figures 13B, 13D, 13F the detached prismatic film includes a plurality of triangular cube corner retroreflective elements in which the light source when reflected produces a light pattern having a greater horizontal dispersion than a vertical dispersion . The horizontal dispersion is at least 1.5 times greater at the 0 ° and 60 ° entry angles and the total light return at 60 ° is less than 10% of the light return at 0 ° and in some cases greater than than 30%.
    [0064] Finally, Figure 14 is an exemplary graph of camera signal for different screen sizes having an aspect ratio of 16/9. As is evident from the graph, for screen sizes of 17 inches, 19 inches, 22 inches, 26 inches and 30 inches, the minimum signal strength never drops below approximately 2.0 while the maximum signal strength can be as high as 30.0 through an observation angle of 90 °. Therefore, the retroreflective material of the invention provides sufficient retroreflection through a 90 ° angle to generate an easily detectable signal on cameras used in the preferred mode.
    [0065] It will thus be seen, according to the present invention, that a highly advantageous prismatic film for use with the touch screen and position detection system has been provided. Although the invention has been described in connection with what is currently considered to be the most practical and preferred modality, it will be apparent to those of ordinary skill in the art that the invention should not be limited to the disclosed modality, that many modifications and equivalent arrangements can be made. made therein, within the scope of the invention, the scope of which should be given the broadest interpretation of the present invention and in such a way as to cover all equivalent structures and products.
    [0066] Publications, patents and patent applications are referred to throughout this disclosure. All references cited herein are hereby incorporated by reference.
    权利要求:
    Claims (28)
    [0001]
    1. Position detection system (100), comprising: a camera (117) positioned to receive electromagnetic radiation through a detection area that generates a signal representative of an image; a dual source of electromagnetic radiation (110) positioned adjacent to the camera (117) to emit electromagnetic radiation that overlaps part of a detection area, and a prismatic film (108) positioned along a periphery of part of the detection area which retrofills electromagnetic radiation from the source to the camera (117), the prismatic film (108) being characterized by the fact that it includes a plurality of individual retro-reflective elements of triangular cube corner (140) having errors of dihedral angle e1, e2, and e3 such that ei ~ e2 ± 0 and e3 ~ 0, and where ei and e2 are both positive or both negative in each individual triangular cube corner retro-reflective element (i40).
    [0002]
    2. System according to claim i, characterized by the fact that the source of electromagnetic radiation is a pair of IR emitters.
    [0003]
    3. System, according to claim i, characterized by the fact that | ei | and | e2 | are between 0.03 ° and 0.20 °.
    [0004]
    4. System according to claim i, characterized by the fact that the plurality of triangular cube corner elements (140) is inclined between 8 ° and 24 °.
    [0005]
    5. System according to claim 1, characterized by the fact that the triangular cube corner retro-reflective elements (140) have a cube depth between 0.0508 and 0.14 mm.
    [0006]
    6. Position detection system (100), comprising: a camera (117) positioned to receive electromagnetic radiation through a detection area that generates a signal representative of an image; a dual source of electromagnetic radiation (110) positioned adjacent to the camera (117) to emit electromagnetic radiation covering at least part of a detection area, and a prismatic film (108) positioned along a periphery of part of the area of detection that retrofills electromagnetic radiation from the source to the camera (117), in which the prismatic film (108) is characterized by comprising a plurality of individual retro-reflective elements of triangular cube corner (140) and the radiation source, when reflected, it produces a light pattern that has a greater horizontal dispersion than a vertical dispersion at 0 ° and 60 ° entry angles, the triangular cube corner retroreflective elements (140) having dihedral angle errors ei, e2, and e3 such that ei ~ e2 Φ 0 and e3 ~ 0, and where e1 and e2 are both positive or both negative in each individual retro-reflective triangular cube corner element (140).
    [0007]
    7. Prismatic film (108), comprising: a prismatic film (108) detached having a retro-reflective substrate (132) including a plurality of individual retro-reflective elements of triangular cube corner (140), and retro-reflective cube-corner elements (140 ) being characterized by the fact that they have dihedral angle errors ei, e2, and e3 such that ei ~ e2 Φ0 and e3 ~ 0, in which each cube corner retroreflective element (i40) is defined by a plurality of grooves (2i2 , 2i4, 2i6), each having a fixed depth, where ei and e2 are both positive or both negative in each individual retro-reflective triangular cube corner element (i40).
    [0008]
    Prismatic film (i08) according to claim 7, characterized in that it additionally comprises a metallized layer arranged on a part of the cube corner elements (i40).
    [0009]
    9. Prismatic film (i08) according to claim 7, characterized by the fact that the plurality of triangular cube corner elements (i40) is inclined between i2 ° and 20 °.
    [0010]
    10. Prismatic film (i08), according to claim 7, characterized by the fact that the plurality of triangular cube corner elements (i40) has the most parallel and inclined edge.
    [0011]
    11. Prismatic film (i08), according to claim 7, characterized by the fact that half of the plurality of triangular cube corner retroreflective elements (140) have dihedral angle errors e1 and e2 between 0.03 ° and 0, 20 ° and the remaining half of the plurality of triangular cube corner retroreflective elements (140) have dihedral angle errors e1 and e2, between -0.03 ° and -0.20 °.
    [0012]
    12. Prismatic film (108) according to claim 7, characterized by the fact that the triangular cube corner retro-reflective elements (140) have a cube depth between 0.0508 and 0.14 mm.
    [0013]
    13. Prismatic film (108) according to claim 8, characterized by the fact that the film is transparent to infrared light, but is not transparent to visible light.
    [0014]
    14. Prismatic film (108) according to claim 7, characterized by the fact that the first substrate (120) was painted with an infrared paint and appears black in visible light.
    [0015]
    15. Prismatic film (108), according to claim 8, characterized by the fact that the metallized layer is formed from one of aluminum and gold.
    [0016]
    16. Prismatic film (108), according to claim 7, characterized by the fact that | e1 - e2 | / 2> 0.03 °.
    [0017]
    17. Prismatic film (108), according to claim 7, characterized by the fact that | e1 - e2 | / 2> 0.05 °.
    [0018]
    18. Prismatic film (108), according to claim 7, characterized by the fact that e3 <0.05 °.
    [0019]
    19. Prismatic film (108), according to claim 7, characterized by the fact that e3 <0.025 °.
    [0020]
    20. Prismatic film (108), according to claim 7, characterized by the fact that e1 - e2 <0.06 °.
    [0021]
    21. Prismatic film (108), according to claim 7, characterized by the fact that e1 - e2 <0.03 °.
    [0022]
    22. Prismatic film (108), comprising: a detached prismatic film (108) having a retro-reflective substrate (132) including a plurality of individual retro-reflective triangular cube corner elements (140); a light source including a pair of point source light-emitting diodes; and in which the light source, when reflected, produces a light pattern having a horizontal dispersion greater than a vertical dispersion at 0 ° and 60 ° entry angles, the triangular cube corner retroreflective elements (140) being characterized due to the dihedral angle errors e1, e2, and e3 such that ei ~ e2 ± 0 and e3 ~ 0, and where e1 and e2 are both positive or both negative in each individual retro-reflective triangular cube corner element ( i40).
    [0023]
    23. Prismatic film (i08), according to claim 22, characterized by the fact that the horizontal dispersion is i, 5 times greater than the vertical dispersion at 0 ° and 60 ° inlet angles.
    [0024]
    24. Prismatic film (108) according to claim 23, characterized by the fact that the total light return at 60 ° is 10% of the light return at 0 °.
    [0025]
    25. Prismatic film (108) according to claim 22, characterized by the fact that the total light return at 60 ° is 30% light return at 0 °.
    [0026]
    26. Prismatic film (108) according to claim 22, characterized in that the triangular cube corner elements (140) are inclined between -10 ° and -6 °.
    [0027]
    27. Prismatic film (108), comprising: a detached prismatic film (108) having a retroreflective substrate (132) including a plurality of triangular cube corner retroreflective elements (140), and cube corner retroreflective elements (140) being characterized by the fact that they have dihedral angle errors ei, e2, and e3 such that ei ~ e2 ± 0 and e3 ~ 0, in which the various triangular cube corner elements (i40) are inclined between -i5 ° and - 6 °, in which each cube corner retroreflective element (i40) is defined by a plurality of grooves, each having a fixed depth, and where ei and e2 are both positive or both negative in each individual retroreflective corner element of triangular cube (i40).
    [0028]
    28. Prismatic film (108) according to claim 27, characterized in that the plurality of triangular cube corner elements (140) is inclined between -10 ° and -6 °.
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    同族专利:
    公开号 | 公开日
    EP2510424B1|2016-10-19|
    PL2510424T3|2017-06-30|
    KR20180014190A|2018-02-07|
    US9098150B2|2015-08-04|
    WO2011072219A2|2011-06-16|
    BR112012014042A2|2018-05-29|
    RU2573763C2|2016-01-27|
    EP2510424A2|2012-10-17|
    KR101926406B1|2018-12-07|
    RU2012129187A|2014-01-20|
    KR101835448B1|2018-03-08|
    CN102859475A|2013-01-02|
    CN102859475B|2015-08-19|
    WO2011072219A3|2011-08-18|
    ZA201203810B|2013-08-28|
    KR20120109523A|2012-10-08|
    US20120056807A1|2012-03-08|
    ES2605595T3|2017-03-15|
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-08-06| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-08-25| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-15| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 15/12/2020, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US28568409P| true| 2009-12-11|2009-12-11|
    US61/285,684|2009-12-11|
    US40664410P| true| 2010-10-26|2010-10-26|
    US61/406,644|2010-10-26|
    PCT/US2010/059880|WO2011072219A2|2009-12-11|2010-12-10|Position sensing systems for use in touch screens and prismatic film used therein|
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