• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Lighting or signaling device, comprising - a light guide (3) having a transparent block, comprising an entrance surface (310) and a light exit surface (320), - one or more light sources ( 2) located opposite the entrance surface (310) of the light, this device is of the type in which the rays emitted by the light source penetrate into the transparent block (3) at the level of the surface of the light. input (310) of the light and propagate directly or by successive reflections on the walls of the transparent block in a general direction (D) common to the exit surface (320) through which they emerge. A strip (4) composed of a scattering material is arranged in a cross-section between the entrance surface (310) and the exit surface (320) of the light guide, so that the light rays pass through said strip ( 4) from the input surface (310) to the exit surface (320).
    公开号:FR3019259A1
    申请号:FR1452813
    申请日:2014-03-31
    公开日:2015-10-02
    发明作者:Francois Germon；Jean-Francois Doha；Boubacar Sagna
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    [0001] The invention relates to the field of lighting or signaling devices comprising an optical guide, and intended for example for motor vehicles. BACKGROUND OF THE INVENTION [2] The invention is also concerned with the methods of manufacturing these devices. [003] The optical guides are commonly used to bring an illuminating surface in inaccessible areas of the lighting device of a motor vehicle, taking various geometric shapes, so as to adapt to the requirements of style. [4] By optical guide or light guide is meant here a transparent or translucent part, inside which light rays move in a controlled manner, in a common general direction, from a first end of the guide or zone d an inlet having an entrance surface near which are disposed one or more light sources, to an exit area having an exit surface from which the light rays emerge, such that an observer has impression that the output surface is illuminated and corresponds to a light source. [5] Depending on the positioning of the light source and the exit surface, the propagation of light is direct or is made by successive internal reflections of the light rays on the faces of the light guide, called internal reflection faces. The exit surface may be formed by the opposite face or section to the entrance face or by a side face of the light guide. [7] The length of the light guide, as well as the shape and size of the sections of the guide are defined by the designer of the lighting device according to the aesthetic and technical constraints, so as inter alia to minimize the light losses in the portion of the waveguide between the entrance surface and the exit surface. [8] However, it is observed that the luminous intensity is likely to vary greatly between two distinct points of the exit surface. This is largely due to the fact that the light sources are in general point, and do not allow to illuminate homogeneously the entire section of the input face. In order to reduce these variations, the light sources can usefully be associated with diffusion means such as parabolic reflecting elements, to enlarge the size of the incoming beam. Another solution is to multiply the number of light sources by adjusting their distribution. The exit surface may also include heterogeneities whose patterns are arranged according to aesthetic criteria, such that the rays that reach the exit surface at a certain angle emerge outwards, as if the heterogeneities were there. even light sources. The invention aims to provide an alternative or complementary solution to the above exposed devices, easy and inexpensive to implement, and whose purpose is to homogenize the intensity of light at the level of the exit surface. The lighting or signaling device according to the invention comprises: - a light guide formed of a transparent or translucent block, comprising an input surface of the light and an output surface of the light, - one or more light sources located opposite the entrance surface of the light. This light guide is of the type in which the rays emitted by the light source (s) penetrate into the transparent block at the level of the entrance surface of the light and propagate directly or by successive reflections on the walls of the block. transparent in a common general direction towards the exit surface through which they emerge, and is characterized in that a strip, consisting of a diffusing material, is arranged in a cross section between the entrance surface of the light and the exit surface of the light, such that the light rays pass through said strip from the entrance surface of the light to the exit surface of the light. The luminous strip of diffusing material distributes the light rays that pass through it, and thus ensures a better homogeneity of the intensity of the light arriving at the exit surface. According to the invention, the term "diffusing material" is intended to mean a transparent material which has an haze greater than 30%, measured according to ASTM D 1003, the haze corresponding to the phenomenon of diffusion or dispersion of the light which passes through a transparent material, resulting in poor visibility and / or glare. Preferably, the strip is located between an input zone of the light and an exit zone of the light, so as not to disturb the exit of the light at said exit surface of the light. light. According to a first alternative, the strip has a constant thickness. According to a second alternative, the strip has a variable thickness. Preferably, to reduce the losses of light intensity, the thickness of the strip has a value less than 0.2 times, and preferably 0.1 times a characteristic length of the cross section occupied by said strip. In practice, the thickness of the strip is preferably less than 10 mm, and more preferably less than 5 mm. The cross section on which the strip is disposed is substantially perpendicular to the common general direction of progression of light rays. Alternatively, the cross section on which the strip is arranged at a given angle, less than 90 °, with the common general direction of progression of light rays [0023] The strip may occupy the entire cross section on which it is placed, or only a part of said cross section. Preferably the strip is molded in the transparent block. The invention also relates to the method of manufacturing a lighting or signaling device as defined above, wherein the strip is obtained by injecting the diffusing material in a section of a block. transparent previously left free. Preferably, according to a first alternative, the manufacturing method provides the steps in which: - the material forming the transparent block is injected into a mold comprising a movable insert at a given cross section and prefiguring the shape of the strip then, - the mobile insert is released, and the diffusing material forming the strip is injected into said cross section thus released. According to a second alternative, the manufacturing method can provide the steps in which: the material forming the transparent block is injected into a first mold, or a first cavity of a rotary mold, comprising a bead; at a given cross section and prefiguring the shape of the strip then - the block thus formed is transferred into a second mold, or respectively into a second cavity of a rotating mold, and the diffusing material forming the strip is injected into said cross section left free. According to a variant of the second alternative, the manufacturing method uses a rotary mold for bi-injection, the first injection forming the strip of diffusing material which is then overmolded by the material forming the transparent block during a second injection, after rotation of the mold. The invention will be better understood on reading the accompanying figures, which are provided by way of example and are not limiting in nature, in which: - Figure 1 shows a top view of a device according to the invention comprising a diffusing band. FIG. 2 represents a comparison of the light intensity diagrams at the output of two similar devices comprising (FIG. 2b), or not (FIG. 2 a), a diffusing strip.
    [0002] Figure 3 shows a perspective view of a device according to the invention. FIG. 4 represents a view from above of another device according to the invention. FIGS. 5a, 5b and 5c schematically illustrate a first method of producing a device according to the invention. FIGS. 6a, 6b and 6c show schematically a second method of producing a device according to the invention. The device 1, illustrated in Figure 1, comprises a block 3 made of transparent material and forming a light guide. It can be colored or not. In order to channel the light, the transparent block 3 is made of a material such as transparent plastic which has a refractive index higher than the ambient environment, as a rule that the ambient air, in which it is intended to be immersed. The materials commonly used are polymers, generally thermoplastic, preferably selected from the group consisting of polymers or amorphous copolymers such as polyacrylics, polyesters, polycarbonates, polyethers sulfones or poly set epoxy siloxanes and cyclic olefin polymers. Some of these polymers, such as polymethyl methacrylate, have a very pronounced and crystalline translucent appearance, and are known as crystal plastic, particularly sought after for the stylistic effects they provide. The light guide (3) is separable into three distinct areas, the (fictitious) boundaries are visualized by bold and dotted lines: - An input area 31 comprising one or more input faces 310 , and which includes the area downstream of the, or entry surfaces. An exit zone 32 comprising an exit surface 320, and which comprises the zone situated upstream of the exit surface. An intermediate zone 30 situated between the input zone 31 and the output zone 32 and constituting the actual light guide, and in which the light propagates according to the known principles and briefly described above, since the input surface 310 to the outlet surface 320, directly or by successive reflections on the inner faces of the light guide in a common general direction, denoted D. The device illustrated in FIG. 1 comprises two sources of light 2 each arranged opposite the input faces 310 located in the input zone 31. The main optical axis of each source is also oriented in the general direction D. The number of light sources is not limiting and may be subject to successive adjustments depending on the desired effect. Each light ray admitted into the light guide by the input face 310, and which does not propagate directly to the exit face, reaches an inner wall of the light guide at a given angle relative to the normal surface reached. When this angle is greater than a certain threshold angle, it is reflected inside the light guide. The light rays propagate in the light guide by successive reflections on the inner walls to reach the exit zone 32 at which it is arranged that they reach the inner walls of the exit surface 320 with an angle of incidence with the normal lower than the threshold value, so that they emerge outwardly through the outlet surface 320 of the device. The device of Figure 1 comprises a strip 4 disposed between the input surface 310 and the outlet surface 320 in a cross section of the light guide 30. It may be useful to place the transverse strip upstream of the exit zone, in the intermediate zone 30, so as inter alia not to interfere with the means situated in the exit zone and intended to modify the angle of reflection of the light rays in order to to make them emerge, especially when the exit surface is a lateral surface of the light guide. The output zone 32 will then be defined as being the zone in which the light rays are reoriented to reach the exit face 320 with an angle of incidence with the normal lower than the threshold value. The inlet zone 31, which does not have such stresses, may be limited to the only zone located just downstream of the entrance surface, after the light rays have penetrated into the light guide. It can be confused with the entrance surface. The intermediate zone 30 will be located between the input zone 31 and the output zone 32. In the following description, it is considered that a section is transversal when it is not parallel to the common general direction D according to which the light rays move from the input area 31 and the input surface 310 to the exit zone 32 and the exit surface 320. The cross section occupied by the strip can be a cross section, that is to say a section substantially perpendicular to the general direction D as shown in Figures 3 and 4, or a section at a given angle (a), less than 90 °, and as it is has seen above, greater than 0 °, with said general direction D, as shown in Figure 1. The strip 4 is formed of a translucent diffusing material. According to the invention, it is a transparent polymeric material which has a haze greater than 30%, measured according to the ASTM D 1003 standard. According to an exemplary embodiment, this material comprises a translucent matrix, which can also be the nature of materials used to make the light guide, and which contains nanoparticles on which the light is reflected in random directions and anisotropically, so that the light passing through the strip is diffused more homogeneously. By nanoparticle is meant here a particle having, in an orthonormal frame, one of its dimensions less than 100 nm, and a size between 2 and 1000 nm, and more preferably between 2 and 200 nm. Size being the size of the two other dimensions of the nanoparticle. The nanoparticles preferably have a polyhedral or spherical shape. These nanoparticles can usefully be of two types: - A first type of particle allows the scattering of light by total reflection of light rays incident on their surface. It is then nanoparticles of organic nature, such as carbon nanostructures, or inorganic nanocrystals, especially nanocrystals of metal oxides. - A second type of nanoparticle emits light following their excitation by an incident light ray. It is then nanoscale particles, such as quantum dots, of the order of 2 to 10 nm, comprising a semiconductor core, generally chemically modified surface. The density of the nanoparticles in the matrix of transparent material makes it possible to control the homogeneity of the emitted or diffused light. The strip of diffusing material is preferably thin to avoid in particular the loss of light intensity related to the diffusion of light in directions at an angle with the normal to the surface of the light guide below said angle threshold, which would then cause the output of light rays to the outside of the light guide outside the output surface 320 itself. The thickness e of the strip is measured here in a direction parallel to the so-called general common direction D of light ray circulation in the light guide. Also, it is arranged that the thickness e of the strip is less than 0.2 times, and preferably 0.1 times a characteristic length of the cross section occupied by said strip. This is called the characteristic length of the section, the length of the straight line 30 defining the longest free path. For a circular or elliptical section, the value of the largest diameter will be considered, for a polyhedron the value of the diagonal g having the greatest length will be considered, and for more complex sectional shapes, successive approaches will be taken. considering for example the developed length of the average fiber of said section. In the case illustrated in Figure 1 or Figure 3, the characteristic length will be the length of the diagonal g shown in dashed lines. In practice, and in the cases most commonly observed in the use to which the lighting or signaling device is intended, namely the equipment of motor vehicles, the thickness e of the diffuser strip is from order of a few millimeters and does not exceed ten millimeters even, and preferably five millimeters. It may be useful to vary said thickness e over the width of the section so as to modulate the diffusion effects depending on the location of the light sources. Similarly, it is quite possible to provide a strip of which some parts have a zero thickness, which amounts to arrange the strip on only part of the section of the light guide. The diagram shown in Figure 2 allows to highlight the phenomenon sought for a lighting device of the type shown in Figure 1. The ordinate values represent an evaluation of the light intensity measured at the level of the exit surface 320, as a function of the lateral position, the values of which are on the abscissa. Diagram 2a represents the light intensities measured at the exit surface of a device without a diffusing strip, and diagram 2b represents the same measurement for an identical device, this time provided with a diffusing strip 4 having a variable thickness e occupying a whole section of the light guide, and as shown in Figure 1. There is a better distribution of light intensity. It will be noted here that when the cross section of the device, defined as a section orthogonal to the general common direction D, has a width I whose value is much greater than its height h (see FIG. 3 or 4), it is often useful to multiply the number of light sources. Here is meant by much greater than having a width I greater than one or two multiples of ten times the height h; The device according to the invention then makes it possible to homogenize the light coming from all these sources and to better distribute it over the entire exit surface. After passing through the diffusing strip 4, the light reaches the exit surface 320 where it emerges in the direction of the external area to be illuminated. The exit surface may be a face of the light guide occupying a section of the device as shown in Figure 1 or Figure 3. It may also be constituted by a side face as shown. In FIG. 4, it will be observed that, in the case of the latter device, because of the particular position of the exit surface 320, it is important to adjust and homogenise the quantities of light upstream of this surface of to give the impression that the whole surface is illuminated with the same intensity. This is made possible by the device according to the invention. Finally, the invention makes it possible to produce the exit surface in the same transparent material forming the light guide, and which can therefore have a crystal appearance such as that sought by the stylists. The manufacture of a lighting device according to the invention may usefully be by injection. This is possible when the material used is of a thermoplastic nature or the number of base materials useful for polymerization is reduced. The advantage of this method is that it provides a transparent block comprising a diffusing strip forming a single piece, thus reducing the light loss associated with the Fresnel coefficients between the input interfaces. and leaving the diffusing strip. According to a first method, the injection can be done directly in a mold 50, comprising a movable drawer 51 forming a reserve at the precise location of the strip. The transparent material itself is then injected and then the reserve is released by actuating the movable drawer 51. In the space thus released, the diffusing material 4 is injected, as is illustrated in FIGS. 5a and 5b. We then obtain a light guide 3 according to the invention, as shown in Figure 5c. According to a second method, if one does not wish to use a drawer mold, because of the high price of the latter, then one can realize the lighting device by injecting into a first mold 60, or a first cavity of a rotating mold for biinjection, the transparent material. This mold 60 comprises a fixed bead 61 prefiguring the shape of the band. Then this block of transparent material is transferred into a second mold 62, or respectively in a second cavity of said rotary mold, and the diffusing material is injected into the part thus released and previously occupied by the fixed cord, as illustrated. Figures 6a and 6b. According to a variant, it will be possible to invert the injection steps and overmould the block of diffusing material on the strip formed during the first injection. We then obtain a light guide 3 according to the invention, as shown in Figure 6c. It can be seen in FIGS. 6 that the transparent block includes a bridging connecting the parts situated upstream and downstream of the diffusing strip so as to allow easy transfer of the part between the two molds 60 and 62. [0069] In In both cases, it can be considered that the interfaces between the diffusing strip and the transparent block are free from air and that light passes from one material to another without loss of intensity. Embodiments of the invention serving as a basis for the present description, as well as the injection methods as described above are not limiting, provided that they make it possible to obtain the technical effects such as described and claimed.
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. Lighting or signaling device, in particular for a motor vehicle, comprising: - a light guide (3) comprising a transparent block, comprising an entrance surface (310) and a light exit surface (320), one or more light sources (2) located opposite the input surface (310) of the light, of the type in which the rays emitted by the light source penetrate into the transparent block (3) at the level of the entrance surface (310) of the light and propagates directly or by successive reflections on the walls of the transparent block in a general direction (D) common to the outlet surface (320) through which they emerge, characterized in a strip (4) consisting of a diffusing material is arranged in a cross-section between the light entry surface (310) and the light exit surface (320) so that the light rays pass through said strip (4) in from the light entry surface (310) to the light exit surface (320).
    [0002]
    2. Device according to claim 1, wherein the strip (4) is located between a light entry zone (31) and an exit zone of the light (32).
    [0003]
    3. Device according to claim 1 or claim 2, wherein the strip (4) has a thickness (e) constant.
    [0004]
    4. Device according to claim 1 or claim 2, wherein the strip (4) has a thickness (e) variable.
    [0005]
    5. Device according to claim 3 or claim 4, wherein the thickness (e) of the strip (4) has a value less than 0.2 times, and preferably 0.1 times a characteristic length (g) of the cross section occupied by said strip (4).
    [0006]
    6. Device according to claim 3 or claim 4, wherein the thickness (e) of the strip (4) is less than 10mm, and preferably less than 5mm.
    [0007]
    7. Device according to one of claims 1 to 6, wherein the cross section on which is arranged the strip (4) is substantially perpendicular to the common general direction (D) of progression of light rays.
    [0008]
    8. Device according to one of claims 1 to 6, wherein the cross section on which is arranged the strip makes a given angle (a), less than 90 °, with the common general direction (D) of progression of light rays
    [0009]
    9. Device according to one of claims 1 to 8, wherein the strip (4) occupies the entire cross section on which it is placed.
    [0010]
    10. Device according to one of claims 1 to 8, wherein the strip (4) occupies only partially the cross section on which it is placed.
    [0011]
    11. Device according to one of claims 1 to 10, wherein the strip (4) is molded in the transparent block (3).
    [0012]
    12. A method of manufacturing a lighting or signaling device according to one of claims 1 to 11, wherein the strip (4) is obtained by injecting the diffusing material in a section of a transparent block (3). ) previously left free.
    [0013]
    13. Manufacturing method according to claim 12, wherein: - the material forming the transparent block (3) is injected into a mold (50) having a movable insert (51) at a given cross section and prefiguring the shape of the strip then, - one releases the movable insert (51) and injects the diffusing material forming the strip (4) in said cross section thus released.
    [0014]
    The manufacturing method according to claim 12, wherein: the material forming the transparent block (3) is injected into a first mold (60) or into a first cavity of a rotating mold, comprising a bead (61) at a given cross-sectional level and prefiguring the shape of the strip then - the block (3) thus formed is transferred into a second mold (62), or respectively into a second cavity of said rotary mold, and the scattering material forming is injected the strip (4) in said cross section left free.
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    同族专利:
    公开号 | 公开日
    EP2927571A1|2015-10-07|
    FR3019259B1|2019-04-05|
    引用文献:
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    DE102012014622A1|2012-07-24|2014-01-30|Daimler Ag|Lighting device for motor vehicle, has base body with two sections of different composition, where sections of different optical polarity, particularly scattering- or absorption property, are connected to each other in firm manner|
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    WO2014199108A1|2013-06-14|2014-12-18|Automotive Lighting Rear Lamps France|Lighting module for motor vehicles having continuously evolving light homogeneity|
    TWI336890B|2007-12-21|2011-02-01|Nat Univ Tsing Hua|Built-in self-repair method for nand flash memory and system thereof|ITUB20155929A1|2015-11-26|2017-05-26|Automotive Lighting Italia S P A A Socio Unico|LIGHTING DEVICE FOR VEHICLES|
    FR3048785B1|2016-03-10|2018-04-13|Valeo Vision|GUIDE OF LIGHT WITH DIFFUSING MATERIAL|
    ITUA20164809A1|2016-06-30|2017-12-30|Automotive Lighting Italia Spa|AUTOMOTIVE HEADLIGHT INCLUDING A PORTION OF LUMINOUS EMISSION WITH OPALESCENT EFFECT|
    IT201600114519A1|2016-11-14|2018-05-14|Automotive Lighting Italia Spa|AUTOMOTIVE HEADLIGHT|
    WO2018189086A1|2017-04-14|2018-10-18|HELLA GmbH & Co. KGaA|Method and apparatus to improve the homogeneity of an edge-light|
    法律状态:
    2016-03-31| PLFP| Fee payment|Year of fee payment: 3 |
    2017-03-31| PLFP| Fee payment|Year of fee payment: 4 |
    2018-03-29| PLFP| Fee payment|Year of fee payment: 5 |
    2020-03-31| PLFP| Fee payment|Year of fee payment: 7 |
    2021-03-30| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1452813A|FR3019259B1|2014-03-31|2014-03-31|LIGHT GUIDE COMPRISING A BAND WITH DIFFUSING MATERIAL|
    FR1452813|2014-03-31|FR1452813A| FR3019259B1|2014-03-31|2014-03-31|LIGHT GUIDE COMPRISING A BAND WITH DIFFUSING MATERIAL|
    EP15162083.8A| EP2927571A1|2014-03-31|2015-03-31|Light guide having a strip made of diffusing material|
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