A lighting device configured to perform at least two lighting functions.

Abstract

A lighting device configured to perform two lighting functions. A lighting device comprising at least one matrix device (2) in which a mask (23) is interposed between the input microlens matrix (21) and the output microlens matrix (22) and in which light circulation channels (5) are formed between an input microlens (20) and an output microlens (24), the mask (23) comprising mask portions (231, 232) respectively arranged in a light circulation channel (5) and provided with at least one aperture (26) capable of allowing light rays to pass from the input microlens (20) to the output microlens (24), characterized in that it comprises a plurality of selectively addressable light sources (41, 42), the apertures (26) provided in the mask being distributed into a plurality of aperture types with at least one aperture of a first type (261) and one aperture of a second type (262).Figure for the abbreviation: Figure 5.

Description

Title of the invention: Lighting device configured to perform at least two lighting functions.

[0001] The present invention relates to the field of lighting devices, in particular those capable of equipping a motor vehicle. The present invention relates more particularly to such lighting devices capable of generating at least one lighting light function and one signaling light function.

[0002] Vehicles, and in particular motor vehicles, are commonly equipped with headlights for generating various light functions such as road lighting or signaling the vehicle to other road users, including daytime running light functions or direction indicator light functions.

[0003] In certain applications, light rays emitted by a light source are directed within a microlens array device also known by the English acronym MLA for "microlens array" to shape a beam allowing the realization of a light function.

[0004] Within this microlens matrix, an occulting element is capable of blocking certain light rays so as to modulate the associated light function.

[0005] The matrix device comprises an array of input microlenses, an array of output microlenses and a mask interposed between these arrays. The matrix device is configured to form light circulation channels between one of the input microlenses and one of the output microlenses, the mask comprising mask portions respectively arranged in one of the light circulation channels. Each mask portion is provided with at least one opening capable of allowing light rays to pass from the input microlens to the output microlens. The openings in the mask are configured to give a shape to the rays transmitted by the array of input lenses and to allow the array of output lenses to project this shape onto the road.

[0006] Furthermore, vehicles and more particularly motor vehicles have increasingly compact headlights within which the same light module is capable of generating several light functions and in particular a lighting function and a signaling function.

[0007] In this context, it is sought to emit light beams specific to each of the light functions generated by the module through the same lighting surface. In other words, in a search for a visual identity of the lighting of a vehicle, it is desired that an observer outside the vehicle sees the same illuminated surface whether it is a lighting function or a signaling function which is provided by the projector.

[0008] The microlens matrix devices of the prior art are not suitable for such requirements, insofar as a single light source is arranged in front of the input microlens matrix. However, the inventors wish to be able to implement such a microlens matrix device insofar as these devices make it possible to give the functional illuminating surface a great deal of freedom of shape, and therefore freedom of style for the projector equipped with the matrix device, by means of discretization by the unit area of ​​the input and output microlenses.

[0009] In this context, the present invention proposes a light device comprising at least light emission means and a microlens matrix device, the light emission means being configured to emit light rays into the matrix device, the matrix device comprising at least one mask, an input microlens matrix, an output microlens matrix, the matrix device being configured to form light circulation channels respectively arranged between an input microlens and an output microlens, the mask being interposed between the input microlens matrix and the output microlens matrix and comprising mask portions respectively arranged in one of the light circulation channels,each mask portion being provided with at least one opening capable of allowing light rays to pass through a light circulation channel from the input microlens to the output microlens, characterized in that the light emission means comprise a plurality of selectively addressable light sources, and in that the openings provided in the mask are distributed into a plurality of types of opening such that a first set of mask portions comprises an opening of a first type and a second set of mask portions comprises an opening of a second type.

[0010] Each input and output microlens comprises a curved surface, facing the outside of the matrix device, and the thickness of material which extends from the curved surface to the mask, the mask forming the boundary between the input microlens array and the output microlens array. The channels are defined as a strip of the material of the matrix device formed by an input microlens and an output microlens arranged opposite the input microlens if the main optical axis is considered, and there is no structural element within the matrix device, such as a partition for example, to generate a physical delimitation between two neighboring channels.

[0011] If light traveling in a flow channel encounters an opening in the mask portion associated with that flow channel, the light may be propagated toward the output microlens array, which enables the realization of a light function. If this light comes from a first light source, a first light function can be realized and if this light comes from a second light source, a second light function can be realized. In both cases, the light participating in realizing the light function exits from a common illumination surface, formed by an exit surface of the output microlens array.

[0012] The light device comprises a main optical axis, the first and second light functions being emitted globally along this main axis. In other words, the light beams of the first and second light functions each extend in a volume containing said main optical axis.

[0013] The input microlens array and the output microlens array may both be perpendicular to the main optical axis. In this case the light circulation channels are respectively arranged along the main optical axis, i.e. parallel to this axis.

[0014] The input microlens array and the output microlens array may both be inclined relative to the main optical axis, i.e. the median virtual surfaces on which said microlens arrays respectively rest are inclined relative to a plane perpendicular to said axis. In a first configuration, each output microlens is laterally offset relative to the respective associated input microlens to define a light circulation channel, relative to the main optical axis. In this configuration, the light circulation channels are respectively inclined relative to the main optical axis.In another configuration, certain sets of input microlenses and output microlenses respectively associated to define a light circulation channel are respectively axially offset with respect to at least one of the adjacent sets, relative to the main optical axis. Thus, there are steps present on the external faces of the input microlens array and the output microlens array, these steps generating an overall inclination of these arrays. In this configuration, the light circulation channels are respectively arranged along the main optical axis, i.e., parallel to this axis. It should be noted that said median virtual surfaces may be flat or curved.

[0015] Conversely, if light flowing in a flow channel does not encounter an opening in the mask portion associated with that channel, the light is blocked by the mask in that channel.

[0016] While it is notable that part of the emitted light intensity is lost within the matrix device, since light rays emitted by a light source are blocked in the circulation channels comprising a type of opening which does not correspond to the light function, the matrix device according to the invention makes it possible to easily and precisely produce different light functions with the same lighting surface, the mask being produced by lithography to produce different types of openings specific to the production of this or that light function.

[0017] It is to be understood that the mask comprises a plurality of portions and that each of the light circulation channels comprises a mask portion which is associated with the circulation channel.

[0018] The light sources are said to be selectively addressable insofar as they can be activated independently of one another, by an electronic control device. More particularly, when one of the light sources is activated, the other or other light sources are deactivated and only one light source is capable of emitting light rays. In other cases, at least some of the light sources, in particular all the light sources, are switched on simultaneously, which makes it possible to simultaneously generate the respectively associated light functions.

[0019] The light sources may in particular be light-emitting diodes.

[0020] The input microlens array and the output microlens array are composed of microlenses whose dimensions are of the order of a millimeter, between 0.3 mm and 10 mm.

[0021] More particularly, according to an advantageous embodiment of the invention, the projection microlenses all have a size, in diameter, height and / or width, in front view, less than or equal to 10 mm. This makes it possible to limit the thickness of the microlenses, and thus to limit the mass of the part. Furthermore, according to an advantageous embodiment of the invention, the projection microlenses all have a size, in diameter, height and / or width, in front view, greater than or equal to 0.3 mm. This makes it possible to manufacture the optical device by an injection method that is simple to implement. According to an advantageous embodiment of the invention, the projection lenses all have a size, in diameter, height and / or width, in front view, of between 0.5 and 5 mm. This allows the projection lenses to be small enough not to be distinguished at the usual observation distance.

[0022] According to an optional characteristic of the invention, the light device comprises a collimator common to the plurality of light sources, the collimator being interposed between said light sources and the matrix of input microlenses.

[0023] The collimator is configured to reorient the rays which pass through it so as to form at the output a beam of rays which are substantially parallel to each other and thus to direct these light rays homogeneously towards the microlenses of the input microlens matrix. By “substantially parallel” it is understood that the rays may have an angular offset related to the size of the light source that generates them. After passing through the collimator, the light rays emitted by one or other of the selectively addressable light sources are thus directed homogeneously onto each of the input microlenses.

[0024] According to an optional characteristic of the invention, the light device comprises a first light source, the activation of which participates in generating a first light function, and a second light source, the activation of which participates in generating a second light function, the light rays emitted by the first light source being intended to pass through the mask via an opening of a first type and the light rays emitted by the second light source being intended to pass through the mask via an opening of a second type.

[0025] It should be noted that by "participate in generating", it is understood that the light device according to the invention can be the only device allowing the desired lighting or signaling beam to be produced or that the light beam generated by this light device can be combined with other light beams generated by other light devices to form said beam, whether or not these other light devices comply with the invention. Furthermore, the expression also covers the fact that the first light function can form part of the second light function, and vice versa.

[0026] According to an optional characteristic of the invention, the first light source and the second light source are distributed on either side of a defined plane, the first light source being closer to said defined plane than the second light source. The first source may, if necessary, be arranged partly on this defined plane. The defined plane considered is a plane substantially perpendicular to one and / or the other of the microlens matrices and it comprises the main optical axis of the light device. This defined plane may in particular be a median plane, if necessary a plane of symmetry, of the collimator.

[0027] According to an optional characteristic of the invention, each output microlens of a light circulation channel is configured to have an object focus at the opening formed in the mask portion associated with said light circulation channel. According to an optional characteristic of the invention, the focus of an exit microlens of a circulation channel comprising an opening of a first type is arranged substantially on a border delimiting said opening. This is notably implemented for circulation channels intended to be crossed by light rays participating in forming a lighting function, and notably a dipped beam function for which it is desired to have a clear cut-off of the beam, the cut-off of the beam then being achieved by said border delimiting the opening on which the object focus evoked is placed.

[0028] According to an optional characteristic of the invention, the openings of a first type have a raised edge forming a cut-off edge for a lighting beam.

[0029] According to an optional characteristic of the invention, the object focus of an exit microlens of a circulation channel comprising an opening of a second type is arranged substantially in the center of said opening. By substantially in the center, it should be understood that this object focus is arranged far from an edge delimiting the second opening, which includes for example a position in which the object focus is arranged at two-thirds of a distance between two opposite edges delimiting this second opening. This is notably implemented for circulation channels intended to be crossed by light rays participating in forming a signaling function.

[0030] According to an optional characteristic of the invention, the mask is formed by a glass slide comprising at least one opaque layer deposited on one face of the glass slide, the openings being formed by cutouts in this opaque layer. More particularly, the opaque layer is deposited on the face of the glass slide which is opposite the input microlens array.

[0031] According to an optional characteristic of the invention, the openings of a first type and the openings of a second type are arranged alternately on the mask along at least one main elongation direction. In other words, according to an optional characteristic of the invention, at least two successive mask portions have openings of a different type. The matrix device extends mainly in a functional plane by two main elongation directions, perpendicular to the main optical axis of the optical axis, and each matrix of microlenses, input or output, is formed of microlenses arranged in rows and columns along these two main elongation directions. An alternation of the openings of the different types can be done along one of the elongation directions or along both directions.

[0032] According to an optional feature of the invention, the number of different types of opening is equal to the number of different light sources. For example: if two light functions are provided, with two light sources facing a common collimator, two types of openings are made in the mask. When a first light source is activated, the light rays are focused by each input microlens within their associated circulation channel onto first zones of the mask portion present in this channel. When the second light source is activated, the light rays are focused by each input microlens within their associated circulation channel, onto second zones of the mask portion present in this channel, offset relative to the first zones according to the direction of offset of the light sources relative to each other. Depending on the type of opening present in the light circulation channel, the first zones and the second zones are arranged in a transparent part of the mask formed by the opening or in an opaque part of the mask, and the light rays may or may not propagate accordingly within the matrix device.

[0033] According to an optional characteristic of the invention, the output microlenses associated with a light circulation channel equipped with a mask portion with an opening of the first type have an optical axis whose relative position within the light circulation channel is distinct from the corresponding relative position of the optical axis of the output microlenses associated with a light circulation channel equipped with a mask portion with an opening of the second type. Thus, providing an off-center exit microlens so that its center is aligned with the aperture or the edge of the aperture helps to appropriately deflect light rays.

[0034] According to an optional characteristic of the invention, the openings of a first type, respectively the openings of a second type are configured within the mask so that at least one of the openings of the first type, respectively at least one of the openings of the second type, has a shape and / or a dimension different from the other openings of the same type.

[0035] In this way, it is understood that the invention also covers cases where the windows formed by the openings can differ from one portion of mask to another for the realization of the same function, for example to have more precise control within the globally generated light beam. By way of example, windows of different widths allow good precision on the evolution of the photometric values ​​on a horizontal section of the beam.

[0036] According to an optional characteristic of the invention, the input microlenses and the output microlenses respectively have an external surface, in particular a curved surface, facing the outside of the matrix device, and the matrix device is configured to have an output surface, formed by the plurality of external surfaces of the output microlenses, which is inclined relative to a longitudinal direction along which the main optical axis of the light device extends.

[0037] For this purpose, the entire matrix device, and the light circulation channels as well, can be inclined relative to this main optical axis, with the external surfaces of the output microlenses extending in a plane substantially parallel to the plane in which the external surfaces of the input microlenses extend. The microlenses, and in particular the output microlenses, are then configured to bend the light rays towards the main optical axis of the light device.

[0038] Alternatively, the input microlens array and the output microlens array remain in a vertical and transverse plane, perpendicular to a longitudinal direction L along which the main optical axis of the light device extends, with light circulation channels remaining in this orientation parallel to the optical axis, and the external surfaces of the input microlenses are axially offset from each other, so as to form transverse rows axially offset from each other and therefore staircase steps which create the tilting effect when viewing the screen as a whole.

[0039] According to an optional characteristic of the invention, the openings of the first type are of different shapes and / or dimensions from the openings of the second type.

[0040] According to an optional characteristic of the invention, the openings of the first type are identical to each other, and the openings of the second type are identical to each other.

[0041] According to an optional characteristic of the invention, at least one of the first openings, respectively at least one of the second openings, has a shape and / or a dimension different from the other first openings, respectively from the other second openings.

[0042] The invention also relates to a motor vehicle comprising at least one lighting device in accordance with what has just been described previously.

[0043] Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows on the one hand, and examples of embodiment given for informational and non-limiting purposes with reference to the appended schematic drawings on the other hand, in which:

[0044] [Fig. 1] represents a light device according to the present invention, making light sources visible, a collimator common to these light sources and a matrix device, comprising in particular a matrix of input microlenses, a mask and a matrix of output microlenses;

[0045] [Fig.2] represents in perspective the components of the matrix device of [Fig.l], with the mask arranged between the microlens arrays;

[0046] [Fig.3] represents a detailed view of a part of the mask of the matrix device of [Fig.2], making visible a portion of mask of a first type and a portion of mask of a second type;

[0047] [Fig.4] represents a general view of the operation of the light device according to the invention providing a first light function, with the schematic representation of light rays propagating in the light device when a first light source is made active;

[0048] [Fig.5] represents a local view of the matrix device, centered on two channels of adjacent light circulation, when the light device ensures the first light function as illustrated in [Fig.4];

[0049] [Fig.6] represents a general view of the operation of the light device according to the invention providing a second light function, with the schematic representation of light rays propagating in the light device when a second light source is made active;

[0050] [Fig.7] represents a local view of the matrix device, centered on the two channels adjacent light circulation devices illustrated in [Fig.4], when the light device provides the second light function as illustrated in [Fig.6].

[0051] It should first be noted that although the figures set out the invention in detail for its implementation, these figures can of course be used to better define the invention, where appropriate. It should also be noted that these figures only set out examples of embodiments of the invention.

[0052] The features, variants and different embodiments of the invention may be combined with each other, in various combinations, provided that they are not incompatible or mutually exclusive. In particular, variants of the invention may be imagined comprising only a selection of features described below in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the state of the art.

[0053] In the figures, the elements common to several figures retain the same reference.

[0054] In the description which follows, reference will be made to an orientation which is a function of the Longitudinal, Vertical and Transverse axes as defined by the trihedron L, V, T shown in FIGS. 1 to 7, with the longitudinal axis L corresponding to the general direction of propagation of the light rays and the vertical and transverse axes V, T which participate in defining a main elongation plane of the microlens matrix device forming part of the light device, perpendicular to the longitudinal axis L. More particularly, the vertical axis V and the transverse axis T correspond respectively to the height and the width of windows produced in a mask as will be described in more detail below, these windows having a width dimension greater than that of the height.The choice of names for these axes does not limit the orientation that the lighting device can take, particularly when it is installed in a motor vehicle.

[0055] [Fig.l] schematically illustrates a light device 1 comprising a matrix device 2 of microlenses, a collimator 3 and light emission means 4.

[0056] The light emission means 4 comprise a plurality of light sources miners which, in the embodiment shown, are two in number, including a first light source 41 and a second light source 42. As will be mentioned later, the number of light sources can vary as long as the matrix device is configured accordingly. Each of the light sources is selectively addressable. Here, each of the first and second light sources 41, 42 is thus able to turn on and off independently of one another, for example by means of an electronic control device.

[0057] The light sources 41, 42 are arranged on either side of a defined plane comprising a main optical axis 10 of the light device. In the example illustrated, the first light source 41 and the second light source 42 are distributed on either side of this defined plane, the distance of each of the light sources relative to the defined plane being able to vary according to the light function that these light sources participate in achieving.

[0058] The collimator 3 and the light emission means 4 are positioned relative to each other so that the light rays emitted by each of the light sources 41, 42 pass through the collimator 3. This collimator 3 is configured to capture light rays emitted by each of the light sources, here the first light source 41 or the second light source 42, and to orient them substantially parallel to each other and to direct them towards the matrix device 2, and more specifically towards an array of input microlenses 21.

[0059] The microlens matrix device 2 comprises said input microlens matrix 21, an output microlens matrix 22 and a mask 23 interposed between the input microlens matrix 21 and the output microlens matrix 22. In the illustrated example, each microlens matrix 21, 22 and the mask 23 extend mainly along a vertical and transverse plane, perpendicular to a longitudinal direction L along which the main optical axis 10 of the light device 1 extends. Alternatively, the matrix device can take a position inclined relative to the main optical axis, in particular to adapt to a curve of the vehicle in which it is to be integrated.This inclined position can be taken by tilting the matrix device as a whole or by forming steps at the output surface of the matrix device formed by an external surface of the output microlens array.

[0060] The output surface of the matrix device, i.e. the external surface of the matrix of output microlenses 22, forms a lighting surface of the lighting device 1, i.e. a surface through which the light rays exit to generate a light beam outside the vehicle, which is common to each of the lighting functions capable of being performed by the lighting device.

[0061] Each microlens matrix, input or output, has an external surface, facing away from the mask, and an internal volume, formed by the thickness of material which extends from the external surface to the mask, the mask forming the boundary between the input microlens matrix and the output microlens matrix.

[0062] The input microlens array 21 is formed of a plurality of input microlenses 20 juxtaposed next to each other, both in the vertical direction, as visible in [Fig. 1], and in the transverse direction. These input microlenses each have a curved surface whose juxtaposition, where appropriate with a longitudinal offset which generates a step from one curved surface to the other, forms the external surface of the input microlens array, and they each have a thickness of material extending between the curved surface and the mask to be able to propagate the light from one to the other.

[0063] Each input microlens 20 is configured within the matrix device 2 such that it has an image focus on the mask 23. The light rays coming from the collimator 3 and passing through an input microlens 20 converge towards a focal point present on the mask 23. In the example illustrated, the input microlenses 20 are identical to each other.

[0064] In accordance with the arrangement of the input microlens array 20, the output microlens array 22 is formed of a plurality of output microlenses 24 juxtaposed next to each other, both in the vertical direction, as seen in [Fig.l], and in the transverse direction.

[0065] These output microlenses each have a curved surface whose juxtaposition, where appropriate with a longitudinal offset which generates a step from one curved surface to the other, forms the external surface of the matrix of output microlenses, i.e. the output surface of the matrix device, and they each have a thickness of material extending between the mask and the curved surface to be able to propagate the light from one to the other.

[0066] It is notable in the figures schematically representing the matrix device that only the external surface of the input and output microlenses is represented, but it should be noted that each microlens is not just formed by the curved surface but indeed includes the thickness of material which goes from this curved surface to the mask, or to the mask support when there is one.

[0067] Each output microlens 24 is configured within the matrix device 2 such that it has an object focus on the mask 23. The light rays propagating within the matrix device and passing through this object focus are reoriented by the corresponding output microlens 24 into a light beam to be projected onto the road scene to participate in forming a lighting or signaling beam.

[0068] It should be noted that each input microlens 20 is associated with a single output microlens 24 such that the image focus of an input microlens 20 coincides with the object focus of an output microlens 24.

[0069] In other words, the matrix device 2 according to the invention is configured to comprise within it light circulation channels 5, extending respectively, in a direction parallel to that of the main optical axis 10, between an input microlens 20 and an associated output microlens 24. The light rays shaped by the collimator which are caused to pass through an input microlens 20 propagate essentially in the light circulation channel 5 associated with this input microlens 20 and they exit the matrix device 2 essentially through the output microlens 24 associated with this light circulation channel, once they have been able to pass through the mask 23 arranged across the light circulation channel 5.

[0070] The light circulation channels are defined as a strip of material of the matrix device formed by the input microlens matrix and the output microlens matrix. In other words, a circulation channel is defined by a strip of material of an input microlens and by a strip of material of the output microlens extending in continuity, if we consider the main optical axis, of said input microlens. No structural element, such as a partition for example, is provided within the matrix device to generate a physical delimitation between two neighboring channels.

[0071] As will be described in more detail below, the output microlenses 24 may have a different configuration depending on the light circulation channel 5 in which they are arranged. In particular, certain output microlenses 24 may have, relative to the light circulation channel specific to them and to the light function that they must participate in generating, a symmetrical or asymmetrical configuration, or more particularly centered or off-centered, with an optical axis of the output microlens which is coincident with or offset relative to a median axis of the associated light circulation channel.

[0072] Each light circulation channel 5 comprises a portion of the mask 23 extending across the matrix device between the input microlens matrix 21 and the output microlens matrix 22, the mask 23 consisting of a plurality of mask portions 231, 232 juxtaposed with each other and respectively arranged in a light circulation channel 5 which is specific to them.

[0073] Mask portions 231, 232 comprise openings 26, visible in [Fig. 2], through which the rays deflected by the corresponding input microlens 20 are able to pass to continue their propagation through the matrix device 2. These mask portions 231, 232 thus respectively comprise an opaque part 233, which blocks the propagation of the light rays when they encounter this opaque part, and a transparent part 234, formed by the opening 26 and allowing the propagation of light rays brought to meet this transparent part.

[0074] Each output microlens 24 is more particularly configured to have an object focus positioned in the opening 26 forming the transparent part 234 of the mask portion 231, 232 arranged in the light circulation channel 5 corresponding to it. As will be described below, the object focus of the output microlenses 24 can be positioned in a central position of the opening 26 or in an off-center position, and in particular on an edge delimiting the opening 26.

[0075] In the previously mentioned context of input microlenses 20 focused on the mask, it is understood that if the light rays focused by the input microlens 20 of a light circulation channel 5 are directed onto the opaque part 233 of the mask portion 231, 232 arranged across this light circulation channel 5, the light is blocked at the mask 23 and does not propagate to the output microlens 24 associated with this light circulation channel. Conversely, if the input microlens 20 of another light circulation channel focuses light rays onto the transparent part 234 of the mask portion 231, 232 arranged across this other light circulation channel, the light is directed towards the output microlens 24 associated with this light circulation channel.

[0076] The matrix device is made of a transparent material, with here the mask 23 which is formed by a glass slide surrounded by a plastic material, the glass slide comprising at least one opaque layer deposited on one face of the glass slide, the opaque layer being cut, for example by a laser cutting operation, to produce each of the openings 26. The cut part(s) thus form the transparent part 234 of the mask portions 231, 232 and the remainder forms the opaque part 233.

[0077] The position of the mask 23 within the matrix device 2, as illustrated in [Fig. 1] and repeated in Figures 4 and 6, is given here for information purposes. The mask 23 could, without departing from the context of the invention, be moved along the main optical axis 10 to move closer to the input microlens matrix 21 or the output microlens matrix 22, provided that the microlenses are configured to have a focus on the mask as previously mentioned.

[0078] Furthermore, the position of the mask takes into account the thickness, i.e. the dimension along the longitudinal axis L, of the matrix of input microlenses and that of the matrix of output microlenses, the thickness of the input microlenses being able to be at least twice that of the output microlenses insofar as there are two output microlenses for each channel for one input microlens.

[0079] The mask 23 comprises mask portions of a first type 231 and mask portions of a second type 232, the mask portions being distinguished by the position of the openings 26 relative to the corresponding mask portion, and also being able to be distinguished from each other by the shape and dimensions of the opening provided therein.

[0080] In the illustrated example, the mask portions 231, 232 are distinguished from each other by the vertical positioning of the opening 26 within its mask portion. More particularly, as can be seen in [Fig. 3] for example, as well as in FIGS. 5 and 7, the mask portions 231, 232 have a vertical dimension Dv which is equal from one mask portion to the other, extending between an upper vertical edge 28 and a lower vertical edge 30. The mask portions 231, 232 are juxtaposed next to each other so that a lower vertical edge 30 of a mask portion coincides with an upper vertical edge 28 of a neighboring mask portion.In this context, the mask portions are distinguished from each other in that on the one hand the opening 26 of a mask portion of a first type 231 is delimited between a first border extending at a first distance DI from the upper vertical edge 28 of this mask portion and a second border extending at a second distance D2 from this upper vertical edge 28, and in that on the other hand the opening 26 of a mask portion of a second type 232 is delimited between a first border extending at a third distance D3 from the upper vertical edge 28 of this mask portion and a second border extending at a fourth distance D4 from this upper vertical edge 28. The value of the first distance DI is different from the value of the third distance D3, and the value of the second distance D2 is different from the value of the fourth distance D4.In the example illustrated, the value of the first distance DI is smaller than the value of the third distance D3, and the value of the second distance D2 is smaller than the value of the fourth distance D4, the vertical dimension of each of the openings being substantially the same.

[0081] The mask 23 comprises a plurality of these different types of mask portions, and it is thus possible to identify a first set 6 of mask portions of the first type 231 and a second set 7 of mask portions of the second type 232. As will be detailed later, it is notable that the number of sets 6, 7 of mask portions is equal to the number of different light sources 41, 42 associated with the same collimator 3, and equal to the number of light functions capable of being emitted through the same output surface, namely the matrix of output microlenses 22 or the same optical surface of a projector at the output of the matrix device 2.

[0082] In the illustrated example, two types of mask portions 231, 232 are present and two lighting functions are provided by the lighting device 1 of the invention. with the first light source 41 which participates, when the latter is activated, in generating a first light function and with the second light source 42 which participates, when the latter is activated, in generating a second light function or an additional portion of the first light function.

[0083] In the illustrated example, the first light function is a lighting function and more particularly here a non-dazzling lighting for other road users, known under the name "dipped beam headlights". The second light function is a signaling function and more particularly here a signaling of the presence of the vehicle, known under the name "daytime running lights".

[0084] The choice of the light functions to be provided by the light device results in characteristics concerning the light sources 41, 42 and concerning the openings 26 formed in the mask portions 231, 232.

[0085] The light source associated with the performance of this or that type of light function is thus chosen according to the light intensity that this light function must or must not provide in order to comply with automobile regulations. Furthermore, as mentioned previously, the position of a light source relative to a defined plane comprising the main optical axis may depend on the light function to be performed and in particular on the sharpness of the contours of the light beam to be provided.

[0086] In particular, in the embodiment where the first light function is a “low beam” type lighting function and where the second light function is a signaling function, the first light source 41 allowing the first light function to be performed is closer to the defined plane than the second light source 42 allowing the second light function to be performed.

[0087] The openings 26 have shapes and dimensions that are distinct from one another. In particular, in the exemplary embodiment where the first light function is a “low beam” type lighting function, and as can be seen in particular in [Fig. 2], the openings 26 formed in the mask portions of a first type 231, hereinafter called first openings 261, are delimited by a cut-off edge 32 having a projection. This cut-off edge 32 aims to define in the light beam projected at the output of the matrix device a particular shape making it possible to avoid dazzling road users who are likely to cross the vehicle equipped with the light device. This cut-off edge 32 is the second border extending at a second distance D2 from the upper vertical edge 28 of the corresponding mask portion 231.

[0088] In the illustrated example, the openings 26 formed in the mask portions of a second type 232, hereinafter called second openings 262, are delimited by straight edges.

[0089] The light device 1 according to the invention is particular in that the light emission means 4 comprise a plurality of selectively addressable light sources 41, 42, and in that the openings 26 provided in the mask 23 are distributed into a plurality of opening types such that a first set 6 of mask portions comprises an opening of a first type 261 and a second set 7 of mask portions comprises an opening of a second type 262.

[0090] More particularly, several selectively addressable light sources 41, 42 are configured to illuminate the same matrix of input microlenses 21. It results from this arrangement that when a first light source 41 is active, the input microlenses 20 focus the light rays onto a first zone ZI of the mask portion 231, 232 which corresponds to them. In other words, an input microlens 20 associated with a light circulation channel 5 focuses the light rays emitted by the first light source 41 onto a first zone ZI of the mask portion 231, 232 arranged in this light circulation channel, and another input microlens associated with another light circulation channel focuses the light rays emitted by the first light source onto a first zone of the mask portion arranged in this other light circulation channel.The first zone ZI is located on the mask portion with a first spacing E1 (visible in [Fig.5]) relative to the upper vertical edge 28 of this mask portion. Depending on whether this first zone ZI is located in the opaque part 233 of the mask portion or in the opening 26, i.e. the transparent part 234, of the mask portion, the light rays can propagate towards the corresponding output microlens 24.

[0091] In this context, when the first light source 41 is activated, the light rays propagate only in the light circulation channels within which a mask portion of a certain type is arranged, here the mask portions of the first type 231 forming part of the first set 6.

[0092] When the second light source 42 is activated instead of the first light source 41, due to the different position of these two light sources relative to the optical axis of the collimator 3 and to the input microlenses 20 of the matrix device 2, the input microlenses 20 focus the light rays onto a second zone Z2 of the mask portion which corresponds to them. In other words, an input microlens 20 associated with a light circulation channel 5 focuses the light rays emitted by the second light source 42 onto a second zone Z2 of the mask portion arranged in this light circulation channel 5, and another input microlens associated with another light circulation channel focuses the light rays emitted by the second light source onto a second zone Z2 of the mask portion arranged in this light circulation channel 5, and another input microlens associated with another light circulation channel focuses the light rays emitted by the second light source onto a second zone Z2 of the mask portion arranged in this light circulation channel 5. the mask portion arranged in this other light circulation channel. The second zone Z2 is located on the mask portion with a second spacing E2 (visible in [Fig.7]) relative to the upper vertical edge 28 of this mask portion. Depending on whether this second zone Z2 is located in the opaque part 233 of the mask portion or in the opening 26, i.e. the transparent part 234, of the mask portion, the light rays can propagate towards the corresponding output microlens.

[0093] In this context, when the second light source 42 is activated, the light rays propagate only in the light circulation channels within which a mask portion of a certain type is arranged, here the mask portions of the second type 232.

[0094] According to the invention, it is thus possible to achieve the projection of two distinct light beams onto the same lighting surface, by blocking by the mask 23 a part of the rays focused by the input microlenses 20 when a first lighting function is desired and by blocking another part of the rays focused by the input microlenses 20 when a second lighting function is desired.

[0095] We will illustrate what has just been mentioned by describing more precisely the propagation of light rays emitted by the first light source, with reference to figures 4 and 5 then in a second step the propagation of light rays emitted by the second light source, with reference to figures 6 and 7.

[0096] Figures 4 and 5 illustrate the lighting device when it provides a first lighting function, here “low beam” type lighting.

[0097] The first light source 41 is made active by appropriate control of an electronic control device associated with the light device. The first light source 41 emits rays towards the collimator 3, and the latter collects these rays and directs them into a beam of rays parallel to each other towards the input microlens matrix of the matrix device 2.

[0098] The collimator 3 is configured such that, when the light rays come from the first light source 41, these light rays emerge from the collimator 3 with a main inclination of a first angle al with respect to the main optical axis 10, taking into account, as specified, a delta of divergence of the rays due to the fact that the source is not point-like. In this context, the light rays are deflected by each input microlens 20 to encounter a first zone ZI of each portion of the mask 23 arranged across the light circulation channel 5 and visible in [Fig. 5]. Depending on the type of mask portion encountered by the light rays, they propagate towards the output microlens matrix 22 to be projected outside the vehicle or they are blocked by the mask 23.

[0099] As can be seen in [Fig.5] in particular, the first zone ZI is located on the mask portion with a first spacing E1 relative to the upper vertical edge 28 of this mask portion.

[0100] In the light circulation channels 5 where the mask portion is part of the first set 6, that is to say in the light circulation channels 5 comprising a mask portion of the first type 231, the light focused on the first zone ZI passes through an opening 26 forming the transparent part 234 of the mask portion, also called opening of a first type or first opening 261. For this purpose, considering the first distance DI and the second distance D2 associated with this first opening and previously mentioned, the value of the first spacing E1 is between the value of the first distance DI and the value of the second distance D2 which define the dimension of the first openings.More particularly here, the value of the first spacing El is substantially equal to the value of the second distance, so that the first zone Zl, on which the light rays are focused when the first light source 41 is active, is located substantially on the second edge of the first opening which forms the cut-off edge 32 previously mentioned.

[0101] In the light circulation channels where the mask portion is part of the second set 7, that is to say in the light circulation channels with a mask portion of the second type 232, the light focused on the first zone Z1 encounters the opaque part of the mask portion. For this purpose, the value of the first spacing E1 is not between the value of the third distance D3 and the value of the fourth distance D4 which define the dimension of the second openings 262 present in these light circulation channels. More particularly here, the value of the second spacing E2 is strictly less than the value of the third distance D3.

[0102] It follows from the above that the light rays emitted by the first light source 41 propagate within the matrix device 2 in the light circulation channels 5 associated with mask portions of the first type 231, with first openings 261. The output microlenses arranged downstream of these mask portions of the first type 231 are configured to deflect the light rays in the direction of the road on which the vehicle is traveling to form a non-dazzling lighting beam.

[0103] Figures 6 and 7 illustrate the lighting device when it provides a second lighting function, here a vehicle signaling function of the “daytime running lights” type.

[0104] The second light source 42 is made active by appropriate control of an electronic control device associated with the light device. The second light source 42 emits rays towards collimator 3, and the latter collects these rays and directs them into a beam of rays parallel to each other towards the matrix of input microlenses of matrix device 2.

[0105] The collimator 3 is configured such that, when the light rays come from the second light source 42, these light rays emerge from the collimator with a main inclination of a second angle a2 relative to the main optical axis 10, again taking into account, as specified, a delta of divergence of the rays due to the fact that the source is not point-like. In this context, the light rays are deflected by each input microlens 20 to encounter a second zone Z2 of each portion of the mask 23 arranged across the light circulation channel 5 and visible in [Fig. 7]. In accordance with what has been described previously, depending on the type of mask portion encountered by the light rays, these propagate towards the output microlens matrix 22 to be projected outside the vehicle or they are blocked by the mask 23.

[0106] As can be seen in [Fig.7] in particular, the second zone Z2 is located on the mask portion with a second spacing E2 relative to the upper vertical edge 28 of this mask portion.

[0107] In the light circulation channels where the mask portion is part of the first set 6, that is to say in the light circulation channels with a mask portion of the first type 231, the light focused on the second zone Z2 meets the opaque part 233 of the mask portion. For this purpose, the value of the second spacing E2 is not between the value of the first distance DI and the value of the second distance D2 which define the dimension of the first openings 261 present in these light circulation channels. More particularly here, the value of the second spacing E2 is strictly greater than the value of the second distance D2.

[0108] In the light circulation channels where the mask portion is part of the second set 7, that is to say in the light circulation channels with a mask portion of the second type 232, the light focused on the second zone Z2 passes through an opening forming the transparent part of the mask portion, also called an opening of a second type or second opening 262. For this purpose, considering the third distance D3 and the fourth distance D4 associated with this second opening 262 and previously mentioned, the value of the second spacing E2 is between the value of the third distance D3 and the value of the fourth distance D4 which define the dimension of the second openings. More particularly here, the value of the second spacing E2 is substantially a value equidistant from the values ​​of the third and fourth distances, so that the second zone Z2, on which the light rays are focused when the second light source is active, is located substantially in the center of the second opening, or two-thirds as mentioned previously, that is to say at a distance from the edge so that the majority of the rays which must pass through the opening are not blocked at the margin.

[0109] It follows from the above that the light rays emitted by the second light source 42 propagate within the matrix device 2 in the light circulation channels 5 associated with mask portions of the second type 232, with second openings 262. The output microlenses arranged downstream of these mask portions of the second type 232 are configured to reorient the light rays into a signaling beam substantially parallel to the direction of the main optical axis 10.

[0110] To do this, it is notable that the output microlenses arranged downstream of the mask portions of the second type 232 are made asymmetrical, so that their apex is substantially aligned longitudinally, that is to say parallel to the main optical axis 10, with the center of the corresponding second opening.

[0111] It can be seen, in particular by comparing figures 4 and 6, that the output surface of the light device, here formed by the matrix of output microlenses but which could be an optical surface of a projector arranged downstream of the matrix device, is illuminated over a substantially identical extent whether the first light function, via the activation of the first light source 41, or the second light function, via the activation of the second light source 42, is implemented.

[0112] In the illustrated example, the matrix device is configured such that the light circulation channels comprising mask portions of the first type 231 are arranged alternately with the light circulation channels comprising mask portions of the second type 232. This alternation is carried out both according to the vertical component and according to the transverse component, as illustrated in [Fig. 2], which makes it possible to ensure a light beam illuminating the entirety of the illumination surface formed by the output microlens matrix, without however forming dark lines which could be perceptible by an external observer. However, without departing from the context of the invention, it would be possible to envisage a different arrangement of the sets 6, 7 of the mask portions of different types, and for example a different alternation of these mask portions with several successive mask portions of the same type.

[0113] The invention as just described makes it possible to meet the aim it set itself, namely to enable the same light module to produce at least two different light functions, by proposing the same lighting surface, namely a surface through which light rays exit which has the same extent regardless of the lighting function implemented.

[0114] It is understood that the configuration of the matrix device proposed as an example with openings could be different, since it allows for the same illuminated surface to be provided regardless of the lighting function implemented. As a non-limiting example, it would be possible to provide, as mentioned, a different alternation of the mask portions of different types, and it would be possible to provide a lighting device which performs two different signaling functions, for example with daytime running lights and direction indicator lights, or two different lighting functions, for example with dipped beam headlights and a high-intensity light function to contribute to the production of a “high beam”.

Claims

Claims

1. A light device (1) comprising at least light emitting means (4) and a microlens matrix device (2), the light emitting means (4) being configured to emit light rays into the matrix device (2), the matrix device (2) comprising at least one mask (23), an input microlens matrix (21), an output microlens matrix (22), the matrix device (2) being configured to form light circulation channels (5) respectively arranged between an input microlens (20) and an output microlens (24), the mask (23) being interposed between the input microlens matrix (21) and the output microlens matrix (22) and comprising mask portions (231, 232) respectively arranged in one of the light circulation channels (5), each mask portion (231,232) being provided with at least one opening (26) capable of allowing light rays to pass through a light circulation channel (5) from the input microlens (20) to the output microlens (24), characterized in that the light emission means (4) comprise a plurality of selectively addressable light sources (41, 42) including at least a first light source (41) whose activation contributes to generating a first light function and a second light source (42) whose activation contributes to generating a second light function, and in that the openings (26) provided in the mask (23) are distributed into a plurality of opening types such that a first set (6) of mask portions (231) comprises an opening of a first type (261) and a second set (7) of mask portions (232) comprises an opening of a second type (262),the light rays emitted by the first light source (41) being intended to pass through the mask (23) only through an opening of a first type (261) and the light rays emitted by the second light source (42) being intended to pass through the mask only through an opening of a second type (262), the light device (1) comprising a collimator (3) common to the plurality of light sources (41, 42), the collimator (3) being interposed between said light sources (41, 42) and the input microlens matrix (21).,

2. Luminous device according to the preceding claim, characterized in that each output microlens (24) of a circulation channel of light (5) is configured to present an object focus at the opening (26) formed in the mask portion (231, 232) associated with said light circulation channel (5).

3. Luminous device according to the preceding claim, characterized in that the object focus of an output microlens (24) of a light circulation channel (5) comprising an opening of a first type (261) is arranged substantially on a border delimiting said opening.

4. Lighting device according to any one of the preceding claims, characterized in that the openings of a first type (261) have a raised edge forming a cut-off edge (32) of a lighting beam.

5. A light device according to any one of the preceding claims, characterized in that the object focus of an output microlens (24) of a light circulation channel (5) comprising an opening of a second type (262) is arranged substantially in the center of said opening.

6. Luminous device according to any one of the preceding claims, characterized in that the openings of a first type (261) and the openings of a second type (262) are arranged alternately on the mask (23) in at least one main direction of elongation.

7. A light device according to any one of the preceding claims, characterized in that the number of different types of aperture is equal to the number of different light sources.

8. A light device according to any one of the preceding claims, characterized in that the output microlenses (24) associated with a light circulation channel (5) equipped with a mask portion with an opening of the first type (261) have an optical axis whose relative position within the light circulation channel is distinct from the corresponding relative position of the optical axis of the output microlenses associated with a light circulation channel equipped with a mask portion with an opening of the second type (262).

9. Luminous device (1) according to one of the preceding claims, characterized in that the openings of the first type (261) are of different shapes and / or dimensions from the openings of the second type (262).

10. Luminous device (1) according to one of the preceding claims, ca- characterized in that the openings of the first type (261) are identical to each other, and in that the openings of the second type (262) are identical to each other.

11. Illumination device according to one of claims 1 to 9, characterized in that at least one of the first openings (261), respectively at least one of the second openings (262), has a shape and / or a dimension different from the other first openings (261), respectively from the other second openings (262).

12. Motor vehicle comprising at least one light device according to any one of the preceding claims.

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