JP2014212115A - Optical module and lighting and/or signaling device for motor vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a solution for distinguishing degradation of light beam cutoff with regard to an adaptive high beam lighting function (or ADB: Adaptive Driving Beam), or a projection system having a light strip matrix.SOLUTION: A light beam, emitted from an LED 408 disposed at a first focal point of a reflector 402, is converged at the first focal point of the reflector 402, and emitted so as to converge toward a second focal point. A module 400 includes a shielding part and a lens 200. The shielding part, including a vertical surface 404, a horizontal surface 406, is disposed at the focal point with remaining a region 405, and a light beam passes the region 405 without being intercepted with the shielding part. The lens 200 is disposed in front of the focal point. The lens and the shielding part are disposed so that a light beam emitted by the module 400 has a vertical cutoff line and a horizontal cutoff line.

Description

  The present invention relates to the field of automotive lighting and / or signaling, and more particularly to automotive optical modules and lighting and / or signaling devices.

  At least one optical illumination and / or signaling device comprising at least one illumination module for illuminating the road with various illumination beams that perform illumination functions known as low beam (or low beam) and / or high beam illumination functions; It is a known practice to equip a car with a pair of optical devices in general.

  To perform the cross beam function, the optical device of the first vehicle prevents the second vehicle driver from being dazzled when the second vehicle encounters or overtakes the first vehicle. A light beam having a horizontal cutoff line located mainly below the horizontal line must be generated.

  For this reason, it is a well-known practice to provide an optical device in which a shielding part and a lens are arranged so as to generate this horizontal cut-off line, and the shielding part can be formed by a reflective horizontal surface also called a beam bender.

  In order to perform the high beam function, the optical device of the first vehicle must generate optical beam illumination mainly above the horizon. In order to prevent the driver of the second vehicle from being dazzled when the second vehicle encounters or overtakes the first vehicle, the first vehicle is the second vehicle. The high beam operation must be stopped when encountering or following.

  Recently, a partial illumination mode has been developed that forms a selective beam that generates a dark region where an anti-glare vehicle or person is recognized. For example, road lighting is better compared to using only low beam lighting, while overcoming the problem of excessive brightness for oncoming or following drivers, as caused by conventional long distance high beam lighting. It has been improved. Such a selective illumination function is called a variable orientation type traveling beam (ADB) or a selective high beam function.

  According to a first known solution for generating this selective high ADB function, a mechanized shielding device is used to generate a cut-off in the light beam generated by one or more illumination modules while simultaneously adding to the vehicle. By controlling the beams generated by the pair of headlights equipped, these beams are superimposed to obtain the required beam. French Patent No. 2923428 discloses an exemplary embodiment of such a solution with a mechanized shield.

  Another known solution for obtaining the ADB function is, for example, a light strip obtained from a light source matrix placed in front of an optical projection system such as a lens, which controls the on / off switching of these light sources. Is to use a matrix. EP-A-2280215 (A2) discloses a variant of this matrix of automotive lighting modules that perform ADB functions. This matrix comprises a plurality of light emitters, each light emitter being associated with a dedicated light guide and lens so as to generate a plurality of light strips, the projection shape of each light strip being generally rectangular and desired Are interlaced to produce an entire light beam corresponding to one of the illumination functions (especially low beam, high beam, selective high beam).

  To illustrate an example of such a selective high beam function, FIG. 1 ensures this selective high beam function, i.e. the light beam iso-illumination with a shadow region 102 corresponding to the detection vehicle 104 that is illuminated on the side. FIG. 100 is represented. In this example, the illumination beam from which the shadow region 102 is generated is obtained by the passing beam (solid curve 106) and the two complementary beams (dashed curve 108) located in FIG.

  In the present invention, when the vertical lateral cut-off line 110 is generated by the generation of such a shadow region 102, the sharpness of these vertical cut-off lines 110 is determined by the horizontal cut-off line 112 and the complementary beam horizontal cut-off line 112 and It includes the discovery that it must be adjustable independently of the sharpness of 114. Furthermore, if the shape of each strip is generally a matrix of light sources projected into the interlaced shape of the light strip, then two lateral cutoffs and one low cutoff that is substantially perpendicular to the lateral cutoff, It should be clearly understood that for each of the strips.

The criteria for optimizing these cut-off lines determined from actual tests appear to be distinct and not easily compatible. That is,
-On the one hand, the sharpness of the horizontal cut-offs 112 and 114 needs to be relatively strongly degraded, especially if the cut-off line of the two beams is generated by a beam vendor. Without this degradation, horizontal cut-off line overlays are not easily completed, so each beam's unique cut-off line appears clearly (contrast problem) and alternates (uniformity problem between areas where contrast is significant). .
-On the other hand, if the driver of the vehicle 104 located in the shadow area 102 is not dazzled by the complementary beam and at the same time, particularly when generated by the interlacing of the light strips, the projection beam contrast and uniformity defects To ensure that the vertical cut-off 110 is kept relatively sharp.

  Also, in the case of a projection system having a light strip matrix, the problem of the visual comfort of the driver of the vehicle equipped with the system and the uniformity of the projection beam is important even when no shadow areas occur. That is, since the projection beam arises from the interlacing and / or juxtaposition of multiple light strips, the vertical cutoff of each of these strips appears to be as visually uniform and continuous as possible. And if multiple light striplines are used, the horizontal cut-off between the two lines must also be blurred so that the beam uniformity is preserved and no contrast defects occur between the lines. . In addition, it is necessary to make the vertical and horizontal cutoff sharpness and blur of the light strip independent and distinguishable in order to obtain satisfactory results in terms of visual comfort. It is clear from the simulations and tests performed.

  As used herein, the terms "vertical" and "horizontal" refer to directions, particularly the beam cutoff direction, and in the case of the term "vertical", they are oriented perpendicular to the horizontal plane, In the case of the term “horizontal”, it is oriented parallel to the horizontal plane. These directions should be taken into account in the operating situation of the device in the vehicle. The use of these terms does not imply that slight changes in the vertical and horizontal directions are excluded from the present invention. In the present specification, for example, an inclination of approximately ± 10 ° with respect to these directions is considered a slight change in two preferred directions.

  In order to obtain a cut-off with a relatively high degradation of sharpness, a micro-structure that diffuses light in different directions is applied to the surface of the lens as described in French Patent No. 2925656 from Holophane. It is a known practice to provide. However, since such degradation obtained using this known solution applies equally to horizontal and vertical cutoffs, a comparison is needed to prevent glare in relation to the ADB function. There is a problem that high sharpness is indispensable.

  The object of the present invention is to eliminate the disadvantages of the prior art, in particular the cutting of the light beam in connection with an adaptive high beam illumination function (or ADB) or in connection with a projection system with a light strip matrix. It is to propose a solution that distinguishes off degradation.

  The first subject of the invention is an optical module of an illumination and / or signaling device, comprising at least one light source for generating a light beam and at least one means for cutting off the light beam, comprising one or more The cutoff means includes means arranged to generate at least one low cutoff and a lateral cutoff of the light beam from the light source and along the path of the light beam after the one or more cutoff means. First and second photoactive surfaces disposed in series, wherein the first photoactive surface comprises at least a first series of patterns extending in a first direction, and a second photoactive surface The optical module is characterized in that the surface comprises at least a second series of patterns extending in a second direction, wherein the first and second directions are substantially perpendicular.

  Substantially vertical is intended herein to mean 90 ° ± 10 ° (inclusive) intersection.

  Since these two series of extended patterns are intended to obtain a horizontal cut-off line sharpness that is different from the vertical cut-off line sharpness of the transmitted beam, the invention makes it possible to The selective high beam function can be used to increase driving comfort and driving safety. Indeed, the sharpness of the horizontal cut-off line is determined by one of the two series of patterns and can be relatively low to avoid inconvenient alternation of contrast and in some cases limit these contrasts. On the other hand, the sharpness of the vertical cut-off line is determined by the other series of patterns, particularly in the case of an illumination system with a light source matrix, which reduces the contrast alternation between interlaced light strips and at the same time It can be relatively high so as to avoid the possibility that the driver located in the shielding area will be dazzled.

  Another advantage of the present invention is that it is low cost and low complexity when compared to a device with movable optical elements on a photoactive surface, for example, by simply incorporating a series of patterns into a lens, statically and ultimately. It becomes possible to provide a sex lighting device. Furthermore, in the case of an illuminating device equipped with a projection lens, by adapting the existing device by replacing the projection lens with the lens according to the present invention, a large amount of industrial investment is made or the manufacturing method of these devices is remarkably modified. Thus, the device can be provided with an ADB function with improved visual comfort.

  In an embodiment of the first variant, the first photoactive surface and the second photoactive surface are diopters.

  In particular, most preferably the two photoactive surfaces are the entrance and exit surfaces of the lens. Thus, the lens for an optical module comprises an optical entrance surface and an optical exit surface, the optical entrance surface comprises at least a first series of patterns extending in a first direction, and the optical exit surface comprises a first A second series of patterns extending in two directions, wherein the first and second directions are substantially perpendicular.

  In the second variation, one of the first and second photoactive surfaces is a diopter and the other is a reflector.

  In the last variation, the first photoactive surface and the second photoactive surface are reflectors.

  Thus, it will be readily appreciated that the illumination module according to the present invention can be adapted to numerous configurations for projecting a light beam.

  The final subject of the invention is an automotive lighting and / or signaling device comprising at least one optical module according to the invention.

  Other advantages and features of the invention will become apparent from the following description of embodiments of the invention, given by way of non-limiting exemplary embodiment, with reference to the accompanying drawings.

FIG. 4 is an isometric view of a light beam performing a selective high beam function as described above. FIG. 2 is an outer surface of a lens according to the present invention and a detailed view of the outer surface. It is a typical view of the deflection | deviation of the light ray implemented in this invention. FIG. 3 is an isometric view of an LED emission beam transmitted by a lens according to the prior art. FIG. 3 is an isometric view of an LED emission beam transmitted by a lens according to the invention provided with a pattern; FIG. 6 is a diagram of a modified embodiment of a lens change according to the present invention. It is a figure which shows the change of the intensity | strength gradient of FIG. 5 obtained by the change modification of FIG. 6 shows another variant embodiment of the lens variation according to the invention, the scales of the axes X and Z being identical to those of the axes X and Z in FIG. 6a, respectively. It is a figure which shows the change of the intensity | strength gradient of FIG. 5 obtained by the change modification of FIG. 7a, and the scale of the axis | shaft X and the axis | shaft Z is the same as that of the axis | shaft X and the axis | shaft X of FIG. FIG. 6 is a schematic view of a modified embodiment of the optical module according to the present invention.

  Referring to FIG. 2, the lens 200 of the optical module comprises an optical entrance surface (not shown) and an optical exit surface (202). This lens 200 is a converging lens and has an optical axis common to the optical entrance surface and the optical exit surface 202. In the embodiment employed, the lens 200 is biconvex, but may be provided with a flat or concave surface without departing from the scope of the present invention.

  The lens 200 has a first series of patterns (not shown) extending in a first direction on the optical entrance surface and a second series 204 of patterns 206 extending in the second direction on the optical exit surface 202. And the first and second directions are substantially vertical.

  In the illustrated embodiment, each optical surface comprises a single series of patterns. According to a variant, each of the one and / or the other optical surface comprises a plurality, for example three independent continuous patterns, which are each stretched in the same direction over the same plane.

  In the exemplary embodiment shown in FIG. 2, the second continuous 204 pattern 206 is intended to reduce the sharpness of the horizontal cut-off line, and the pattern 206 is similar to the horizontal direction, preferably a line. Stretched in the shape. Thus, the first series of patterns located at the entrance surface extends vertically to reduce the sharpness of the vertical cut-off line, but rather than the sharpness reduction provided for the horizontal cut line. Stretch in a non-significant way. A reverse configuration in which the pattern extends in the horizontal direction on the inner surface of the lens and in the vertical direction on the outer surface is also possible.

  According to another feature, the pattern 206 is at least located in the central region 208 of each of the optical surfaces 202, including the optical axis of the corresponding surface. Considering the case of projecting the converging lens of the optical module, the optical axis of the optical entrance surface and the optical axis of the optical exit surface 202 are combined. That is, the lens 200 has a single common optical axis.

  More specifically, this feature can limit the chromatic aberration phenomenon. This chromatic aberration occurs because the refraction of the material constituting the lens is not constant depending on the wavelength of light (blue light is deflected more than red light). This phenomenon appears particularly when the light deflection is large. Thus, this phenomenon becomes more prominent at the upper and lower portions (positions away from the optical axis) of the lens than at the central portion (including the optical axis) of the lens. Since the pattern 206 is disposed at the center including the change, the white light is deflected in the vertical direction. This white light attenuates the color generated by the chromatic aberration phenomenon by covering the cut-off color with the white light.

  This central region 208 includes the optical axis and may be spread symmetrically or asymmetrically with respect to a plane parallel to the direction of the pattern.

  According to one variant, the central region 208 extends over a width of 10 to 40% of the dimension of the optical surface perpendicular to the pattern expansion direction.

  As in the exemplary embodiment shown in FIG. 2, the peripheral region 205 outside this central region 208 that includes the continuous 204 extended pattern 206 may be smooth.

  According to another variant, which is particularly preferred for applications in illumination systems formed by a light source matrix, the pattern 206 is in position throughout each of the optical surfaces 202. In one variation, these are a series of patterns that occupy the entire surface.

  According to yet another variant, the corresponding optical surface comprises a plurality of series of patterns, some of the series of patterns being adjacent or non-adjacent, occupying the central area, and surrounding areas. In the case of non-adjacent states, there is a smooth space between successive patterns.

  According to one embodiment, the pattern extends over a length that is 30-100% of the dimension of the optical surface parallel to the direction of expansion of the pattern.

In the embodiment shown in FIG. 2, a single continuous 204 pattern extends along the length of the lens 200 in the central region 208.
The width l, measured as the distance between the lines defining the continuous 204, the so-called spread is 20 mm, in this example approximately 36% of the 55 mm width l ′ of the lens surface 202, The width l ′ is measured between the upper and lower edges of the optical surface 202. However, depending on the variation, this width l of the series of patterns may be 10-40% of the width l ′ of the surface 202 of the lens 200.
The length L measured as the length of the continuous pattern 206 is equal to the length L ′ of the optical surface 202, in this example 65 mm, which is the side edge of the optical surface 202 Measured between parts. Depending on the variation, this length L may be limited to at least 30% of the length L ′ of the surface 202 of the lens 200.

  As shown with reference to FIG. 3, the pattern of the exit surface is expanded mainly in the horizontal direction, so that the light beam is deflected mainly in the vertical direction. In fact, the light rays contained in the horizontal plane 300 or 302 are not deflected in the horizontal direction but are deflected in the vertical direction. Light rays included in the vertical surface 304 are not deflected in the horizontal direction but are deflected in the vertical direction. In the embodiment shown, the same reason applies for the replacement in which the light beam is deflected by a pattern arranged perpendicular to the entrance surface of the lens.

  According to a preferred embodiment, the pattern is obtained by changing the thickness of the lens applied to the lens surface, following a predetermined profile. This is an embodiment that is easier to implement.

  In particular, as shown in the enlarged view of FIG. 2, the change in the thickness of the surface of the lens is in particular mathematical modeling, ie an undulation with a defined amplitude a and a defined pitch P. In this embodiment, the amplitude a is on the order of several tens of micrometers, while the pitch P is 1 mm.

  According to one variant of this embodiment, the change amplitude a and the change pitch P are constant.

  According to another variant of this embodiment, the change amplitude a and / or the change pitch P are variables.

  According to a preferred variant, the amplitude is reduced as a function of the position of the lens with respect to the optical axis. In particular, in one embodiment, the amplitude of change decreases exponentially. Thereby, a more uniform beam can be obtained. The pitch may be a constant.

  The advantages of this feature will be described in more detail with reference to FIGS. 4 to 7b.

  Referring to FIGS. 4 and 5, emission by a light emitting diode (LED) by a lens according to the prior art (smooth entrance and exit surfaces, FIG. 4) or by a lens according to the invention (entrance and exit surfaces including a pattern, FIG. 5) An iso-illumination diagram obtained from the projected light is shown.

  In the case of a beam obtained using a lens according to the prior art shown in FIG. 4, an equivalent intensity curve, also called an iso-illumination curve, is very much both at the level of the lower cutoff 114 and at the vertical lateral cutoff 110. It is dense. This reflects the sharp cut-off of the beam.

  On the other hand, in the case of the beam obtained using the lens according to the invention shown in FIG. 5, the iso-illuminance curve is not very dense at the level of the lower cutoff 114 'and the level of the vertical cutoff 110'. Similarly, as can be observed from FIGS. 4 and 5, these isoluminance curves at the level of the lower cutoff 114 ′ and the vertical cutoff 110 of the beam obtained with the lens according to the invention are smooth lenses. Is less dense than the respective cut-offs of the beam obtained using.

  Thus, in the present invention, the sharpness of the horizontal cutoff is lower than the sharpness of the vertical cutoff.

  As mentioned above, in a simple embodiment, the profile is regular and corresponds to triangular modeling, ie modeling with a defined amplitude a and a defined pitch P. FIG. 6 a shows such a change, which represents a change in the central portion shown in a range of 20 mm in the vertical direction on both sides of the optical axis X of the lens 200. To show the change, the dimension along the vertical axis and the dimension along the optical axis are different. That is, the vertical axis Z is graduated in millimeters, whereas the optical axis X is graduated in micrometers.

  While efficient to solve the problems with the present invention, this change can be perfectly finished.

  FIG. 6b shows the contrast gradient of the beam obtained with the change of FIG. 6a as a function of the frequency position of the vertical axis V. The gradient used corresponds to the following equation:

Where I _(v) is the luminous intensity of the beam at a specified height V, the height is measured on the vertical axis V, and (I _{(V + 0.1 °)} ) is defined by increments of 0.1 degrees. Is the luminous intensity of the beam at a height corresponding to the height V.

  FIG. 6b shows a first gradient peak A corresponding to a light / dark cut-off with a more significant contrast and a second corresponding to a second cut-off with a significant contrast in the beam between two regions of different light intensity. The double cut-off phenomenon with the following gradient peak B is shown.

  The second cutoff in the beam can cause problems and compromises the uniformity of the beam.

  To improve the beam, one solution is to change the undulations, as can be seen from FIG. 7a.

  The change pattern is the same as that described above except that the amplitude A that decreases according to the lens position z is used with respect to the optical axis, and has the following format.

  As can be seen from FIG. 7b, a single vertex is obtained. Therefore, there is no double cutoff.

  The amplitude of the change may vary in the range of 0 to 50 μm depending on the desired blur.

  Of course, if the lens includes a plurality of first and / or second series of patterns, each of the series of patterns will have its own variation as a function of surface position and desired blur characteristics.

  In one embodiment, the pattern is a filament. Thus, the lens is particularly easy to manufacture by molding.

  According to one embodiment, the lens is an integral component, in particular obtained by molding.

  The subject of the invention is also an optical module of an illumination and / or signaling device, comprising at least one light source for generating a light beam and at least one means for cutting off the light beam, comprising one or more The cutoff means is arranged to generate at least one low cutoff and a lateral cutoff of the light beam from the light source and is continuous along the path of the light beam after the one or more cutoff means. And an optical module comprising first and second photoactive surfaces arranged in a constitutive manner.

  The module comprises a first photoactive surface comprising at least a first series of patterns extending in a first direction, and a second photoactive surface comprising at least a second series of extensions extending in a second direction. Comprising a pattern, wherein the first and second directions are substantially vertical.

  In the context of the present invention, the first or second photoactive surface of the module is not formed by an outer lens that closes a lighting device in which such a module is incorporated.

  According to the present invention, the first and second photoactive surfaces are continuous but need not be consecutive in numerical order. In particular, various configurations are applicable in the context of the present invention.

  Preferably, the low cutoff is substantially horizontal and the lateral cutoff is substantially vertical.

  In a first variant embodiment, the first photoactive surface and the second photoactive surface are diopters. For example, the first photoactive surface may be the entrance or exit surface of the first lens, the second photoactive surface may be the entrance or exit surface of the second lens, Alternatively, the first photoactive surface may be the exit surface of a hemispherical connector element connected to the light guide and the second photoactive surface is the entrance or exit surface of the lens.

  In particular, in a preferred method, the two photoactive surfaces are the entrance and exit surfaces of the same lens, which is the lens described above.

  In the second variation, one of the first and second photoactive surfaces is a diopter and the other is a reflector.

  In the last variation, the first photoactive surface and the second photoactive surface are reflectors.

  In the context of the present invention, any type of reflector is conceivable. For example, a parabolic or elliptical mirror with a composite surface, or a horizontal axis cylindrical mirror.

  As in the case of the lens according to the invention described above, the series of patterns may have regular changes or changes with variable amplitude and / or variable pitch. In addition, a series of patterns on each of the photoactive surfaces extends over the area containing the optical axis of the relevant surface.

  According to one feature, the beam cut-off means may be a single one or a combination of the following forms: a shield, a light guide or a light source, and the light source is a light emitting diode. (LED).

  In the context of the present invention, the term shielding part is also a part made of opaque or reflective material and represents a total reflection diopter. It will be clearly understood that when a light guide is used as the beam cut-off means, it is the exit cross-sectional shape of the guide that makes the light-emitting shape with at least one cut-off. For example, when the cross section of the guide is rectangular, a substantially rectangular light strip is projected.

  FIG. 8 shows a first preferred embodiment of an optical module 400 according to the present invention comprising a light source located at a first focal point of reflector 402, here a reflector configured to receive LED 408. FIG. The reflector allows the light emitted by the LED 408 to be collected and sent to converge toward the second focus. Module 400 also includes a shield and lens 200 according to the present invention. The shield includes a vertical surface 404 and a horizontal surface 406 and is disposed at this focal point, leaving the region 405, and the light beam passes through this region 405 without encountering the shield. The lens 200 is also disposed in front of this focal point. This lens and this shield are arranged so that the beam emitted by the module 400 has a vertical cutoff line 110 'and a horizontal cutoff line 114'. According to a modification, the shielding part used in combination with the lens 200 is, for example, a rotary shielding part of the type described in French Patent Application No. 2997595.

  Sharpness reduction is performed for horizontal and vertical cutoffs. In the exemplary embodiment shown, the pattern change is such that the cutoff is not as pronounced in the horizontal direction as the vertical direction, but the vertical cutoff is not as steep.

  Of course, those skilled in the art will recall modules based on the present invention and, depending on the constraints encountered, that the cut-off is not as pronounced in the vertical direction as in the horizontal direction.

  Another preferred embodiment is a light guide or optical pattern, such as an optical pillow, where the exit cross-sectional shape produces a light strip with a substantially horizontal low cutoff and two substantially vertical lateral cutoffs. Is a combination of a light source connected to a main optical system including a projection lens and a projection lens having a series of patterns as described above. Such main optical systems are described, for example, in European Patent Application Publication No. 2122239, European Patent Application Publication No. 2280215 or German Patent Application Publication No. 102010023359.

  The final subject of the invention is an automotive lighting and / or signaling device comprising a transparent outer lens covering a housing containing at least one optical module, characterized in that it comprises at least one optical module according to the invention. And In the case of a device with a light source matrix, in particular, configurations comprising three, four or five modules may be considered for achieving high beam and variable orientation traveling beam (ADB) functions. The lighting and / or signaling device may further comprise other modules that are not covered by the present invention, such as, for example, low beam, direction change instructions or daytime signaling (daytime running light DRL) functions.

  The present invention has room for various modifications. In particular, the patterns have different shapes and may be continuous or discontinuous.

  Furthermore, an optical module may be used if the same module performs one or more illumination functions such as a passing beam function and / or a high beam function.

  As explained above, other variations of the present invention are possible when considering the various possibilities of creating a cut-off line.

  In addition, any type of light source may be used, such as high intensity discharge lamps (xenon technology), light emitting diodes (LEDs) or so-called laser diodes, such as when phosphorous deposits are excited by laser radiation. .

  Also, the shape and number of cut-off lines considered during the practice of the present invention may vary depending on the application, especially for projection systems having a matrix of light strips. More generally, the spatial distribution of bright and dark areas may vary from embodiment to embodiment of the present invention, for example, by acting on the form of a mechanized shield that forms a cutoff. Good.

  According to the invention, it is possible to produce a lighting module and a lighting device, in particular for a motor vehicle, in particular having a selected area.

Claims (15)

An optical module (400) of a lighting and / or signaling device comprising:
At least one light source for generating a light beam;
At least one means for cutting off the light beam, and one or more cutoff means arranged to generate at least one low cutoff and a lateral cutoff of the light beam from the light source; ,
First and second photoactive surfaces sequentially disposed along the path of the light beam after the one or more cutoff means;
With
The first photoactive surface comprises at least a first series of patterns extending in a first direction;
The second photoactive surface comprises at least a second series of patterns extending in a second direction;
The optical module according to claim 1, wherein the first and second directions are substantially perpendicular.   The optical module (400) of claim 1, wherein the first photoactive surface and the second photoactive surface are diopters. The module comprises a lens (200),
The first photoactive surface is formed by the entrance surface of the lens (200);
The second photoactive surface is formed by an exit surface (202) of the lens (200);
The lens has at least a first series of patterns (206) extending in a first direction on its optical entrance surface and a second series (204) extending in a second direction on its optical exit surface (202). The pattern (206)
The optical module (400) according to claim 1 or 2, characterized in that the first and second directions are substantially perpendicular.   The optical module (400) of claim 3, wherein the pattern (206) is located at least in a central zone (208) comprising a respective optical axis of each of the optical surfaces (202).   The optical module according to claim 4, characterized in that the central zone (208) extends over a width representing 10-40% of the dimension of the optical surface (202) perpendicular to the direction of expansion of the pattern. (400).   The optical module (400) according to claim 3 or 4, characterized in that the pattern (206) is located throughout each of the optical surfaces (202).   The optical module (400) according to any one of claims 3 to 6, characterized in that the pattern is obtained by a change in the thickness of the lens (200) applied on its surface.   The thickness change at the lens surface is an undulation with different amplitudes (a) and a defined pitch (P), in particular mathematical modeling, according to any one of claims 1 to 7 The optical module (400) of claim 1.   9. Optical module (400) according to claim 8, characterized in that the amplitude (a) of the change and the pitch (P) of the change are constants.   9. Optical module (400) according to claim 8, characterized in that the amplitude (a) is a variable as a function of the position of the lens with respect to the optical axis.   The optical module (400) of claim 8, wherein the pitch (P) is a variable.   The optical module (400) of claim 1, wherein one of the first and second photoactive surfaces is a diopter and the other is a reflector.   The optical module (400) of claim 1, wherein the first photoactive surface and the second photoactive surface are reflectors.   The means for cutting off the beam is performed alone or in combination from the form of a shield, a light guide or a light source, and the light source is a light emitting diode (LED). The optical module (400) according to any one of claims 13. An automotive lighting and / or signaling device comprising a transparent outer lens covering a housing containing at least one optical module,
Lighting and / or signaling device, characterized in that it comprises at least one optical module (400) according to any one of the preceding claims.

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