• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    ARRANGEMENT TO GENERATE A LIGHTING LIGHT STANDARD, IMAGE FORMATING READER TO ELECTRICALLY READ A SYMBOL BY IMAGE CAPTURE AND METHOD TO GENERATE A LIGHTING LIGHT PATTERN A substantially uniform lighting pattern is generated on and to the along a symbol to be read by image capture. A solid-state image former is mounted on an angled printed circuit board on an angled ergonomic reader handle. A set of image-forming lens captures return light through a field of view from the symbol along a geometrical axis of formation and image, and projects the captured return light onto the image former. An illumination light source is mounted on the plate to emit illumination light at an acute angle of inclination in relation to the geometrical axis of image formation. An optical component includes a first lens portion with a polynominal incident surface to intercept, flex and align the illumination light emitted to generate the pattern in a scanning direction along the symbol, and a second lens portion (...) .
    公开号:BR112012030417B1
    申请号:R112012030417-8
    申请日:2010-12-28
    公开日:2021-03-02
    发明作者:Rong Liu；Edward Barkan；Mark Drzymala；Igor Vinogradov
    申请人:Symbol Technologies, Inc；
    IPC主号:
    专利说明:

    Description of the related technique
    [0001] Solid-state imaging systems or imaging readers have been used, in both manual and / or hands-free modes of operation, to electro-optically read targets, such as one-dimensional barcode symbols, particularly Universal Product Code (UPC) symbology having a row of bars and spaces spaced apart along a scanning direction, as well as two-dimensional symbols, such as Code 49 symbology having a plurality of vertically stacked rows of patterns of bars and spaces in a single symbol, as described in US Patent No. 4,794,239.
    [0002] The handheld imaging reader includes a housing having a secure grip by an operator, and an imaging module supported by the housing and pointed by the operator at the symbol during reading. The imaging module includes a solid state image maker with a photocell or light sensor array, which corresponds to image elements or pixels [PICture ELement = Figure Elements] in a field of view of the image maker , and a set of image-forming lenses to capture scattered and / or reflected return light from the symbol having an image formed along a geometric image-formation axis, and to project the return light onto the sensor array to start capturing an image of the symbol. Such an image builder may include a uni- or bidimensional charge coupling device (CCD) or a complementary metal oxide semiconductor (CMOS) device and associated circuits to produce and process electronic signals corresponding to a uni- or bidimensional array of data. pixels across the field of view.
    [0003] It is therefore known to use the image former to capture a monochromic image of the symbol as, for example, disclosed in U.S. Patent No. 5,703,349. It is also known to use the built-in multiple channel image maker to capture a full color image of the symbol as, for example, disclosed in U.S. Patent No. 4,613,895. It is common to provide a two-dimensional CCD with a resolution of 640 x 480 commonly found on VGA monitors, although other resolution sizes are possible.
    [0004] To increase the amount of feedback light captured by the sensor array, especially in dark environments and / or a far-reaching reading, the image-forming module generally also includes a lighting light set to illuminate the symbol with lighting for reflection and dispersion from it. When the sensor array is unidimensional, that is, linear, or bidimensional with an anamorphic field of view, the illumination light is preferably distributed along a small, distributed height pattern of illumination, also called the illumination or sweep line, which extends lengthwise along the symbol. The distributed lighting pattern is typically generated using a single light source, eg, a light-emitting diode (LED) sized in the millimeter range and a single cylindrical lens.
    [0005] Although generally satisfactory for its intended purpose, the use of the single LED and the single cylindrical lens has been problematic, because the distributed lighting pattern typically has a higher height than desired, has no sharp edges, is dominated by aberrations optical, and is non-uniform in intensity since the light intensity is brighter along an optical geometric axis on which the LED is centered, and then drops off moving away from the geometric axis, especially in extreme opposite regions of the pattern distributed lighting. The efficiency of the coupling between the LED and the cylindrical lens has also been poor. Adding an aperture point between the LED and the cylindrical lens will improve the sharpness (that is, decrease the height) of the distributed lighting pattern, but at the cost of weaker coupling efficiency and a more opaque distributed lighting pattern that, of course , degrades reading performance.
    [0006] For a brighter distributed lighting pattern, a pair of LEDs spaced apart and a pair of cylindrical lenses can be employed. However, this additionally increases cost, introduces more optical aberrations, and further reduces coupling efficiency. The illumination lights emitted by the pair of LEDs also overlap in a central region of the distributed lighting pattern, thus creating a “hot”, bright point and abrupt transitions of light intensity in the distributed lighting pattern, all of which can make the reading performance deteriorates.
    [0007] The known imaging systems are located above a reading housing window through which the illumination light and the return light pass. Therefore, the field of view of the imaging lens assembly is relatively wide to reliably read symbols located in the range of working distances from the window. This, in turn, reduces the resolution in the distant range of working distances from the window and also spreads the illumination over a wider area, thereby reducing its intensity and again reducing the reading performance.
    [0008] For good ergonomics, the housing handle is advantageously tilted back, for example, by about fifteen degrees from the vertical. The illumination light assembly can advantageously be mounted on a printed circuit board (PCB) mounted on the inclined handle and therefore also inclined in relation to the vertical. The illumination light emitted by the LEDs on board the tilted PCB, therefore, needs to be redirected and aligned with the geometrical axis of image formation generally horizontal of the image lens. Known image formation readers ensure such alignment by configuring the handle and PCB on it to be rigidly vertical, but this results in a housing with a poor ergonomic design that increases operator fatigue and discomfort and decreases productivity. Summary of the invention
    [0009] A feature of the present invention resides in, recorded briefly, an arrangement to generate a substantially uniform distributed lighting pattern of light over and over a symbol to be read by image capture. The array includes an image forming system having a solid state image former with an array of image sensors, such as a CCD or CMOS, and an image forming lens assembly to capture feedback light through a field of view from the symbol and along an axis of image formation, and to project the return light captured in the array. The arrangement is one-dimensional, that is, linear, or it is two-dimensional with an anamorphic field of view. The field of view of the imaging system is generally perpendicular to the geometrical axis of imaging and generally matches the pattern of distributed illumination of light over and across the symbol. The imaging lens assembly preferably includes a plurality of imaging lens, advantageously a double or a Cooke trio, spaced apart along the geometrical axis of imaging, or in close proximity to each other.
    [0010] The arrangement additionally includes an illumination light set having an illumination light source to emit illumination light at an acute angle of inclination in relation to the geometric axis of image formation, and an optical component including a first portion of lens to intercept, deflect and align the illumination light emitted to generate the illumination light pattern distributed substantially uniformly throughout the symbol in a scanning direction generally perpendicular to the image formation axis, and a second portion of lens to collimate the illumination light aligned in a transverse direction generally perpendicular to the scanning direction to generate the substantially uniform distributed illumination light pattern over the symbol. Advantageously, the optical component may comprise a lower half of a symmetrical full-size lens on an optical geometrical axis which is offset from the image-forming geometry axis.
    [0011] The light source includes at least one light-emitting diode (LED) and, preferably, a plurality of LEDs, such as a pair of LEDs spaced apart along a scanning direction along the length of the symbol. An opening point is positioned between each LED and the optical component, preferably in close proximity to the LED, to limit the vertical extent or height of the illumination light emitted on the optical component and, in turn, the vertical height of the light pattern. lighting distributed along the transverse direction. The LEDs and the array are preferably mounted on the surface on a printed circuit board (PCB) inclined at the acute angle of inclination in relation to the geometrical axis of image formation. In the preferred configuration, the tilted PCB is mounted inside an inclined handle of an ergonomic image reader to read the symbol electro-optically by image capture. The reader has a window through which the return light and the distributed light pattern of light pass. The window can be tilted in relation to the geometric axis of image formation to prevent reflections of the illuminated light emitted from reaching the image lens assembly. The imaging lens assembly is located remotely from the window, for example, more than forty millimeters away.
    [0012] The lighting lights emitted from each LED overlap in a central area of the distributed lighting pattern. Therefore, to reduce the luminous intensity in the central zone, the first lens portion is configured with an incident polynomial surface, also operative to optically modify the illumination light to generally be along a straight line along the scanning direction. The second lens portion is configured with an aspherical surface of toroidal or cylindrical outlet to project the illumination light of the limited vertical height passing through the opening point in the direction of the symbol, and to collimate the illumination light aligned over the symbol. The optical component can be a single lens extending along the scanning direction between the LEDs, or a pair of discrete lenses, each for each LED, each lens being configured with the first and second lens portions.
    [0013] According to this invention, the optical component forms the light pattern of illumination distributed over and along the symbol with a uniform intensity not dominated by optical aberrations or abrupt transitions of intensity. The coupling efficiency between the light source and the optical component is greatly improved, thereby increasing light production, intensifying reading performance, and improving the visibility of the distributed light pattern. The reader's ergonomics is enhanced.
    [0014] Another feature of the present invention resides in a method for generating the illumination light pattern distributed substantially uniformly over and along the symbol to be read by image capture. The method is performed by capturing return light through a field of view from the symbol along a geometrical axis of image formation, projecting the captured return light onto a solid state image former, emitting illumination light in a acute angle of inclination in relation to the geometric axis of image formation, intercepting, flexing and aligning the illumination light emitted with a first lens portion of an optical component, and collimating the illumination light aligned with a second lens portion of the component optical to generate the light pattern of illumination substantially uniformly distributed over and along the symbol.
    [0015] The new aspects that are considered to be characteristic of the invention are registered in particular in the attached claims. The invention itself, however, as far as its construction as well as its method of operation, together with its additional objectives and advantages, will be better understood from the following description of specific configurations when read in connection with the accompanying drawings. Brief description of the drawings
    [0016] Figure 1 is an elevation view of a portable image formation reader operative to generate a substantially uniform distributed light pattern over and over a target or symbol to be read by image capture according to this invention;
    [0017] Figure 2 is a schematic diagram of the various components of the reader in Figure 1;
    [0018] Figure 3 is an exploded perspective view of the various components of the reader in Figure 1, including the lighting set in Figure 2;
    [0019] Figure 4 is a perspective view assembled of the components of Figure 3;
    [0020] Figure 5 is an enlarged side view, highlighted representing the operation of the lighting light set of figure 4;
    [0021] Figure 6 is an enlarged cross-sectional view, detached from the image-forming lens assembly;
    [0022] Figure 7 is a perspective view of a configuration of an optical component of the illumination light assembly; and
    [0023] Figure 8 is a perspective view of another configuration of an optical component of the illumination light assembly. Detailed description of preferred settings
    [0024] Reference numeral 30 in figure 1 generally identifies an ergonomic imaging reader configured as a pistol-shaped housing having a barrel or upper body 32 and a lower handle 28 angled back away from body 32 in one inclination angle of, for example, fifteen degrees in relation to the vertical. A window 26 is located adjacent to the front or nose of the body 32 and is also preferably inclined at an angle of inclination of, for example, fifteen degrees, as best shown in figure 5, in relation to the vertical. The imaging reader 30 is held in an operator's hand and used in a manual mode in which a trigger 34 is pulled manually to initiate imaging of target signals, especially one-dimensional symbols, to be read in a range of working distances in relation to window 26. Accommodations of other configurations can also be used.
    [0025] As shown schematically in figure 2, an image formation system or module includes an image former 24 mounted on a printed circuit board (PCB) 22 in reader 30. PCB 22 is mounted inside the inclined handle 28 and , as best shown in figure 5, is also tilted at an angle of inclination of, for example, fifteen degrees, in relation to the vertical. The image trainer 24 is a solid state device, for example, a CCD or CMOS image trainer having a one-dimensional array of image sensors or addressable pixels arranged in a single linear row, or a two-dimensional array of such sensors arranged in mutually orthogonal rows and columns, preferably with an anamorphic field of view, and operative to detect return light captured by an image-forming lens assembly 20 along an image-forming geometric axis 46 through window 26. The return light is scattered and / or reflected from a target or symbol 38 across the field of view. The field of view is generally perpendicular to the geometric axis of image formation 46.
    [0026] The imaging lens assembly 20 is part of the imaging system and is operative to focus the return light on the array of image sensors to allow the symbol 38 to be read. Details of the image-forming lens assembly 20, as best seen in figure 6, are described below. The symbol 38 can be located anywhere in a range of working distances between a close working distance (WD1) and a remote working distance (WD2). In a preferred configuration, WD1 is about 12.7 mm (half an inch) from window 26, and WD2 is about 508.0 mm (twenty inches) from window 26. The image lens assembly 20 is located remotely from window 26, for example, about forty millimeters away.
    [0027] An illumination light assembly is also mounted on the image formation reader and includes an illumination light source, eg, at least one light emitting diode (LED), and preferably a plurality of LEDs, such as a pair of LEDs 10, 12, and an optical component configured to generate a substantially uniform distributed light pattern over and along the symbol 38 to be read by image capture. At least part of the scattered and / or reflected return light is derived from the illumination light pattern over and along the symbol 38. The optical component may comprise a lower half of a full-size lens (shown in dashed lines in figure 5 ) which is symmetrical about an optical geometric axis 56. The optical component can be a single lens as shown in figure 7, or a pair of lenses 16, 18 as shown in figure 8. Details of the illumination light set, as well seen in figs. 3-5, are described below. The window 26 is tilted to prevent reflections of the illumination light from the LEDs 10, 12 from reaching the image-forming lens assembly 20.
    [0028] As shown in figure 2, the image former 24 and the LEDs 10, 12 are operatively connected to an operating controller or microprocessor 36 to control the operation of these components. A memory 14 is connected and accessible to controller 36. Preferably, the microprocessor is the same as that used to process the return light from target symbols 38 and to decode the captured target images.
    [0029] In operation, microprocessor 36 sends a command signal to energize LEDs 10, 12 for a short exposure time, say 500 microseconds or less, and energizes and exposes image trainer 24 to collect light from return, eg illumination light and / or ambient light, starting from target symbol 38 only during the aforementioned exposure period. A typical arrangement requires about 18-33 milliseconds to acquire the entire target image and operates at a frame rate of around 30-60 frames per second.
    [0030] Turning now to figs. 3-5, both LEDs 10, 12 and image maker 24 are each mounted on the slanted PCB 22. Surface mounting eliminates the use of separate ribbon cables and PCBs and connectors. LEDs 10, 12 are mounted at a higher elevation than, and on opposite sides of, the image former 24. LEDs 10, 12 are spaced apart along a scanning direction along the length of the symbol 38. When energized, each LED 10, 12 emits downwards a beam of illumination light substantially against the optical component 16, 18 at the acute tilt angle in relation to the generally horizontal image-forming axis 46. An aperture point 40 is positioned on the optical geometric axis 56 in front of each LED, preferably in the vicinity of the respective LED, to limit the vertical extent or height of the illuminated light beam incident on the optical component 16, 18. LEDs 10, 12 are contained in a housing 42 overlaid by a canopy 44. The optical component 16, 18 is supported in front of the housing 42.
    [0031] Optical component 16, 18 forms an image of each aperture point 40 and includes a first portion of lens 48 to intercept, deflect and align the emitted light beams to generate the substantially uniform distributed light pattern of light. along the scanning direction which is generally perpendicular to the geometrical imaging axis 46, and a second lens portion 50 for vertically collimating the light beams aligned along a transverse direction generally perpendicular to the scanning direction. The light beams emitted from the LEDs overlap in the central zone of the distributed lighting pattern. The first lens portion 48 is configured with an incident polynomial surface 52 to reduce the luminous intensity of the overlapping beams in the central zone, and to conform the pattern of illumination distributed as a generally straight line along the scanning direction. The second lens portion 50 is configured with an aspherical surface of toroidal or cylindrical outlet 54 to project the illumination light of limited vertical height passing through the opening point 40 against the symbol 38 and to collimate the illumination light aligned over and along symbol 38. Optical component 16, 18 can be a single lens (see figure 7) extending along the scanning direction between LEDs 10, 12. Alternatively, the optical component comprises a pair of lenses 16, 18 ( see figure 8) one for each LED, each lens 16, 18 having separately the first and second lens portions 48, 50 and configured separately with the incident polynomial surface 52 and the toroidal or cylindrical exit surface 54. Each polynomial surface 52 creates an asymmetrical pattern of luminous intensity with less intense light in the central zone; therefore, when the less intense lights of both beams overlap in the central zone, they tend to combine the intensity of the light in opposite extreme zones of the distribution pattern across the entire range of working distances.
    [0032] As shown in figure 6, the imaging lens assembly 20 includes a plurality of imaging lens 58, 60, 62, preferably configured with a double or a Cooke trio spaced apart along the geometric axis forming image 46, or in close proximity to each other, and mounted on a fastener 64. The central lens 60 has a negative degree. The trio compensates for optical aberrations.
    [0033] Returning to figure 5, the center of the opening point 40 is on, or is substantially parallel to, and close to, the optical geometric axis 56 such that the rays of illumination light emitted leaving the optical component 16, 18 are substantially parallel to the optical geometric axis 56. A central geometric axis 70 is defined as the geometric center of the optical component 16, 18 and is linear with, or substantially parallel to and close to, the image forming axis 46. The central geometric axis 70 it is also substantially parallel to, and vertically offset from, the optical geometric axis 56. In some configurations, it may be desirable for the center of the aperture point 40 to be offset or inclined with respect to the optical geometric axis 56, such that the illuminating light rays leaving are directed at an angle of inclination in relation to the central geometric axis 70.
    [0034] The arrangement of this invention wastes less lighting than arrangements of the prior art and better combines the field of view of illumination with the field of view of the image formation system. This invention allows a lower resolution image maker to be employed, but without sacrificing legibility over longer working distances.
    [0035] It will be understood that each of the elements described above, or two or more together, can also find a useful application in other types of constructions differing from the types described above. For example, the optical component can be replaced by a lens and an optical wedge.
    [0036] Although the invention has been illustrated and described as an arrangement or module for, and a method for, generating a substantially uniform illumination light pattern over and along a symbol to be read by image capture by a reader image maker, it is not intended to be limited to the details shown, since various structural modifications and changes can be made without deviating in any way from the spirit of the present invention.
    [0037] Without further analysis, the foregoing will thus fully reveal the foundation of the present invention that others can, applying current knowledge, readily adapt it for various applications without omitting features that, from the point of view of the prior art, reasonably constitute the essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations must and are intended to be understood within the meaning and scope of equivalence of the following claims.
    [0038] What is claimed as new and desired to be protected by a Patent Letter is registered in the attached claims.
    权利要求:
    Claims (18)
    [0001]
    1. Arrangement to generate a pattern of illumination light, uniformly distributed over and along a symbol to be read by image capture, comprising: - an image formation system including a solid state image former (24) having an array of image sensors and an image-forming lens assembly (20) for capturing return light over a field of view from the symbol (38) along an image-forming geometry axis (46) and for projecting the captured return light onto the arrangement; and - an illumination light assembly including an illumination light source (10, 12) for emitting illumination light at an acute tilt angle with respect to the image-forming geometry axis (46) and an optical component including a first lens portion (48) to intercept, deflect and align the illumination light emitted to generate the pattern in a scanning direction along the symbol (38), and a second lens portion (50) to collimate the aligned illumination light to generate the pattern in a transverse direction perpendicular to the scanning direction; and characterized by the fact that the light source includes at least one pair of light emitting diodes (10, 12) (LED) mounted on the surface on a printed circuit board (22) (PCB) tilted at the aforementioned acute angle of inclination in in relation to the geometrical axis of image formation (46) and the image maker (24) is also mounted on the surface of the (PCB).
    [0002]
    2. Arrangement according to claim 1, characterized by the fact that the optical component has a central geometric axis (70) and an opening point (40) having a center positioned in relation to the optical geometric axis such that the illumination light emitted is directed at the mentioned angle of inclination in relation to the central geometric axis (70).
    [0003]
    3. Arrangement according to claim 1, characterized in that the light source includes at least one light emitting diode (10, 12) (LED) and an opening point (40) between the LED and the optical component to limit a transverse size of the illumination light emitted incident on the optical component along the transverse direction.
    [0004]
    4. Arrangement according to claim 1, characterized in that the light source includes a pair of light-emitting diodes (10, 12) (LEDs) spaced along the scanning direction in the direction of the symbol's length (38 ), with the illumination light emitted from each LED overlapping in a central zone of the distributed lighting pattern and the first lens portion (48) having an incident polynomial surface to reduce light intensity in the central zone and to conform the distributed lighting pattern to be linearly along the scanning direction.
    [0005]
    5. Arrangement according to claim 1, characterized in that the second lens portion (50) has a cylindrical aspherical or toroidal outlet surface to collimate the aligned illumination light.
    [0006]
    6. Arrangement according to claim 1, characterized in that the light source includes a pair of light-emitting diodes (10, 12) (LEDs) spaced along the scanning direction in the direction of the symbol length (38 ) and the optical component being a single lens extending along the scanning direction between the LEDs.
    [0007]
    7. Arrangement according to claim 1, characterized in that the light source includes a pair of light-emitting diodes (10, 12) (LEDs) spaced along the scanning direction in the direction of the symbol's length (38 ) and the optical component comprising a pair of lenses (16, 18), one for each LED, each lens having the first (48) and second (50) lens portions.
    [0008]
    8. Arrangement to generate a pattern of illumination light, uniformly distributed over and along a symbol to be read by image capture, comprising: - an image formation system having an arrangement of image sensors and a lens set image formation (20) to capture return light over a field of view from the symbol (38) along an image formation geometry axis (46) and to project the captured return light onto the array; - an optical component including a first lens portion (48) to intercept, deflect and align the illumination light emitted to generate the pattern in a scanning direction along the symbol (38) and a second lens portion (50) for collimate the illumination light aligned to generate the pattern in a transverse direction perpendicular to the scanning direction the arrangement being characterized by the fact that it comprises a set of illumination light including an illumination light source (10, 12) to emit illumination light at an acute angle of inclination in relation to the geometric axis of image formation (46); and the optical component having a central geometric axis (70) and an opening point (40) having a center positioned on an optical geometric axis that is displaced from, and parallel to, the central geometric axis (70) along the direction transversal.
    [0009]
    9. Image formation reader to read electromagnetically a symbol by image capture, comprising: - a housing having an ergonomic handle (28) inclined at an acute angle of inclination in relation to the vertical; - a printed circuit board (22) (PCB) mounted on the handle (28) and tilted at the said acute angle of inclination; and - an image forming module supported by the housing, the module including an image forming system including a solid state image former (24) having an array of image sensors mounted on the PCB and a forming lens assembly image (20) to capture return light through a field of view from the symbol (38) along an image formation axis (46) and to project the captured return light onto the array; and - an optical component including a first lens portion (48) to intercept, deflect and align the illumination light emitted to generate the pattern in a scanning direction along the symbol (38) and a second lens portion (50) to collimate the illumination light aligned to generate the pattern in a transverse direction perpendicular to the scanning direction, the reader being characterized by the fact that it comprises an illumination light set including an illumination light source mounted on the PCB to emit light from illumination in the said acute angle of inclination in relation to the geometric axis of image formation (46), the printed circuit board (22) (PCB) being inclined in the said acute angle of inclination in relation to the axis of image formation ( 46).
    [0010]
    10. Reader, according to claim 9, characterized in that the light source includes a pair of light emitting diodes (10, 12) (LEDs) spaced along the scanning direction in the direction of the symbol length (38 ), with the illumination light emitted from each LED overlapping in a central zone of the distributed illumination pattern, with the first lens portion (48) having an incident polynomial surface (52) to reduce the light intensity in the central zone and to conform the desired illumination pattern to be linearly along the scanning direction and the second lens portion (50) having a cylindrical aspherical or toroidal outlet surface or to collimate the aligned illumination light.
    [0011]
    11. Reader, according to claim 9, characterized by the fact that the housing has a window (26) through which the return light and the distributed illumination light pattern pass and the image-forming lens assembly (20) is located remotely from the window (26).
    [0012]
    12. Method for generating a pattern of illumination light, uniformly distributed over a symbol (38) to be read by image capture, comprising the steps of: - capturing return light through a field of view from the symbol (38 ) along an image-forming geometric axis (46) and projecting the captured return light onto a solid-state image former (24); - intercepting, deflecting and aligning the illumination light emitted to generate the pattern in a scanning direction along the symbol (38) with a first lens portion (48) of an optical component; - collimate the aligned illumination light to generate the pattern in a transverse direction perpendicular to the scanning direction; the method being characterized by the fact that it emits illumination light at an acute angle of inclination in relation to the geometric axis of image formation (46); the emission step being performed by a pair of light-emitting diodes (10, 12) (LEDs) and the mounting on the surface of the LEDs and the image maker (24), to be on a printed circuit board (22) (PCB) tilted at the aforementioned acute angle of inclination in relation to the geometric axis of image formation (46).
    [0013]
    13. Method, according to claim 12, characterized in that the emission step is performed by at least one light emitting diode (LED) and the limitation of a transverse size of the emitted illumination light intercepted by the optical component along transverse direction by positioning an opening point (40) between the LED and the optical component.
    [0014]
    14. Method, according to claim 12, characterized in that the emission step is performed by a pair of light emitting diodes (10, 12) (LEDs) spaced along the scanning direction in the direction of the symbol length (38), with the illumination light emitted from each LED overlapping in a central zone of the distributed lighting pattern and configuring the first lens portion (48) with an incident polynomial surface (52) to reduce the intensity of light in the central zone and to conform the distributed lighting pattern to be linearly along the scanning direction.
    [0015]
    15. Method, according to claim 12, characterized by the fact that the second lens portion (50) is configured with a cylindrical aspheric surface or toroidal outlet to collimate the aligned illumination light.
    [0016]
    16. Method, according to claim 12, characterized in that the emission step is performed by a pair of light emitting diodes (10, 12) (LEDs) spaced along the scanning direction in the direction of the symbol length (38) and configure the optical component as a single lens extending along the scanning direction between the LEDs.
    [0017]
    17. Method, according to claim 12, characterized in that the emission step is performed by a pair of light emitting diodes (10, 12) (LEDs) spaced along the scanning direction in the direction of the symbol length (38) and configure the optical component as a pair of lenses (16, 18), one for each LED, each lens being configured with the first (48) and second (50) lens portions.
    [0018]
    18. Method for generating a pattern of illumination light, uniformly distributed over a symbol (38) to be read by image capture, comprising the steps of: - capturing return light through a field of view from the symbol (38 ) along an image-forming geometric axis (46) and projecting the captured return light onto a solid-state image former (24); - intercepting, deflecting and aligning the illumination light emitted to generate the pattern in a scanning direction along the symbol (38) with a first lens portion (48) of an optical component; - collimate the aligned illumination light to generate the pattern in a transverse direction perpendicular to the scanning direction; characterized by the fact that the emission step is performed by a pair of light emitting diodes (10, 12) (LEDs) and the mounting on the surface of the LEDs and the image maker (24), is on a printed circuit board ( 22) (PCB) tilted at the said acute angle of inclination in relation to the geometric axis of image formation (46); and - providing the optical component (16, 18) with a central geometric axis and positioning an opening point (40) with a center on an optical geometric axis (56) which is offset from, and parallel to, the central geometric axis ( 70) along the transverse direction.
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    US8450708B2|2013-05-28|
    EP2577558A1|2013-04-10|
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    EP2577558B1|2016-03-09|
    BR112012030417A2|2016-08-09|
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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]|
    2020-07-28| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|
    2020-12-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-03-02| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 02/03/2021, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/792,222|2010-06-02|
    US12/792,222|US8450708B2|2010-06-02|2010-06-02|Arrangement for and method of generating uniform distributed illumination pattern for imaging reader|
    PCT/US2010/062177|WO2011152853A1|2010-06-02|2010-12-28|Arrangement for and method of generating uniform distributed illumination pattern for imaging reader|
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