Lighting system for a motor vehicle, emitting at least two light beams

Abstract

The invention relates to a motor vehicle lighting system (1) comprising a micro-electromechanical device (26) having a mirror (24) which is configured to tilt between a first position (A) and a second position (B), and two separate light-emitting means (4, 6) which are respectively configured to emit a light beam (FL1, FL2) towards the mirror (24) of the micro-electromechanical device (26), said mirror (24) reflecting each of the light beams (FL1, FL2) such that the tilting of the mirror causes the light beams to sweep a projection surface (10).

Description

[0001] DESCRIPTION

[0002] Title of the invention: Motor vehicle lighting system emitting at least two light beams

[0003] The present invention relates to the field of optoelectronics and finds particular application in the automotive industry. More specifically, it relates to lighting systems integrated into vehicles for the performance of lighting, signaling and / or decorative functions.

[0004] These automotive lighting systems, used both inside and outside vehicles, project light onto various surfaces to form patterns, warnings, or logos. On the exterior, they can serve as safety signals, for example, by projecting open door warnings or parking guidelines onto the ground. Inside, these lighting systems can be implemented to enhance the vehicle's aesthetics and generate purely decorative patterns, but they can also contribute to safety by projecting pictograms representing a risky driving situation into the driver's field of vision, for example.

[0005] Automotive lighting systems designed to project pictograms, traffic signs, or decorative patterns onto a projection surface can, for example, use an RGB (Red, Green, Blue) light emission system comprising three laser sources. The light beams of these three colors can be combined to form a single beam, thus offering a wide range of colors. These systems also include one or more mirrors onto which the combined laser beam is directed. These mirrors are configured to orient the beam toward a specific projection area by oscillating between a first and second position, enabling rapid scanning of the projection surface. This high speed gives the impression of a static image to the user.

[0006] However, the light beam can pose a danger to eye health. When viewed, the beam creates a retinal image which, depending on its intensity, can cause damage. The higher the intensity of the light beam and the longer its exposure time on the retina, the greater the risk of damage. Furthermore, a smaller retinal image concentrates the light beam's intensity onto a reduced area and increases the surface density of light power, thus increasing the risk of damage. Conversely, a larger retinal image disperses the light beam's intensity and decreases the surface density of light power, thereby reducing the risk of eye injury.

[0007] To increase the size of the retinal image, the reflective surface of the mirrors can be enlarged. This allows a larger spot to be projected onto the projection surface, thus reducing eye risks while maintaining the same beam power, which guarantees a bright projected image.

[0008] However, enlarging the mirrors can lead to a decrease in the resolution of the projected image. A larger projected spot results in a less precise scanning of the light beam, thus reducing the resolution of the projected image. Therefore, while using larger mirrors creates a less dangerous image for the eyes while maintaining brightness, it has the drawback of lower resolution.

[0009] There is therefore a need for a motor vehicle lighting system that can use high beam powers to achieve high brightness of the projected image, while reducing the potential danger to the eyes and maintaining high resolution of the projected image.

[0010] The objective of the invention described in this document is therefore to overcome the drawbacks of the prior art by presenting a motor vehicle lighting system comprising a micro-electromechanical device, in which a mirror is configured to tilt between a first position and a second position, and at least a first light emission means and a second light emission means, distinct from each other and respectively configured to emit a first light beam and a second light beam towards the mirror of the micro-electromechanical device, said mirror reflecting each of the light beams so that the tilting of the mirror causes a sweep of said light beams over a projection surface, the first light beam being directed onto the mirror of the micro-electromechanical device at a first point of the mirror, and the second light beam being directed onto a second point of the mirror.distinct from the first point.

[0011] The automotive lighting system includes a mirror configured to reflect light beams onto a projection surface. The oscillation of this mirror, controlled by a microelectromechanical device, allows the reflected rays to scan the entire projection surface, creating successive lines which, through the effect of retinal persistence, form a fixed image for the observer. To achieve this effect, the mirror must oscillate at a sufficiently rapid frequency.

[0012] This oscillation frequency depends on the size of the mirror in the microelectromechanical device. For example, a mirror with a size of approximately 1 mm 2It oscillates at a frequency of approximately 25 kHz, allowing for the formation of 700 lines per image, which corresponds to high resolution. However, if this mirror stops moving, the reflected light beam becomes dangerous because it concentrates high power on a small area, which can damage the retina. Safety standards therefore limit the power of the laser beam to approximately 200 lux for a 1 mm microelectromechanical device mirror. 2 .

[0013] To mitigate this risk, a larger mirror for the microelectromechanical device can be used, for example 4 mm 2This allows the use of a light beam with a power of 700 lux, producing a brighter projected image. However, a larger mirror oscillates at a lower frequency, for example, around 15 kHz. This lower frequency results in a longer exposure time on the retina, which is negative, but this is largely offset by the larger size of the retinal image resulting from the increased mirror size. This, in turn, reduces the power density and thus the risk to the eye. Furthermore, the lower oscillation frequency reduces the number of lines per image, from 700 to 400 in this example, which decreases the resolution of the projected image.

[0014] Therefore, according to the invention, at least two light beams, the first and second beams, are reflected by different areas of the same mirror in order to be projected onto the projection surface. Thus, during each oscillation of the mirror between the first and second positions, two lines are formed, and two different pixels are generated with a single oscillation of the mirror. This allows the number of projected lines to be doubled for the same oscillation frequency. For example, for a 4 mm mirror 2 This translates to 800 lines per image, with a light output of 700 lux. This results in a brighter projected image, while reducing risks to eye safety through the use of a larger mirror, and without compromising the resolution of the projected image.

[0015] These two beams are emitted simultaneously by separate means of light emission and reflected simultaneously by the mirror common to both means of light emission.

[0016] The first and second light emission methods can use various technologies to emit a light beam. However, they must be configured to emit their light beams at two distinct points on the mirror.

[0017] By directing the light beams onto different points on the mirror's reflective surface, the first and second beams, for a given mirror position, are projected onto distinct areas of the projection surface. As the mirror moves, the beam sweep creates two separate lines. This increases resolution because, instead of producing a single line per mirror oscillation, two lines are created simultaneously.

[0018] This approach can also be extended to the use of more than two light beams reflected by a single mirror, which is particularly useful when using a large microelectromechanical device mirror. Indeed, as the size of the mirror increases, its oscillation frequency decreases, which, without the use of additional beams, would result in a significant reduction in the resolution of the projected image.

[0019] According to an optional feature of the invention, for a given tilting of the mirror between the first position and the second position, the first light beam sweeps a first area of ​​the projection surface and the second light beam sweeps a second area of ​​the projection surface distinct from the first area.

[0020] This distinct scanning of the two zones by the light beams results from the oscillation of the mirror, as well as from the fact that the first and second light beams are directed towards two different points on the mirror of the microelectromechanical device and sufficiently far apart, which is made possible by the mirror's ample size. Consequently, the line formed by the first light beam during the mirror's oscillation is traced in the first zone of the projection surface, while the line formed by the second light beam is traced in the second zone.

[0021] According to an optional feature of the invention, the first point on which the first light beam is directed and the second point on which the second light beam is directed are arranged on either side of a median axis of the mirror parallel to the direction of a tilting axis of said mirror.

[0022] In other words, the mirror is configured to pivot about a given tilting axis to move from the first position to the second position, and a median axis of the mirror is defined as the axis parallel to this tilting axis that divides the reflecting surface into two equal parts, the two points to which the light beams are directed being located in each of the parts of the mirror separated by this median axis. According to an optional feature of the invention, the tilting of the mirror is configured so that the first and second light beams respectively reflected by the mirror form parallel lines on the projection surface.

[0023] Specifically, the tilting axis of the microelectromechanical device's mirror can be oriented perpendicular to the main direction of light beam propagation towards the mirror. Thanks to this configuration, the two lines formed by the reflection of the light beams during the mirror's oscillation are parallel to each other, allowing the creation of the same image as with a single beam, but with twice the resolution.

[0024] According to an optional feature of the invention, the first zone of the projection surface and the second zone of the projection surface are adjacent zones.

[0025] It is understood that the two lines created are thus adjacent in the final projected image, producing an alternation of lines from the first and second beams of light. This final image is achieved by incrementally shifting the mirror's orientation so that the reflected light beam is shifted in a direction perpendicular to the direction of the line formed by the light beam during a mirror oscillation. In this context, shifting the line formed by the reflection of the first light beam by a given increment is accompanied by shifting the line formed by the reflection of the second light beam by the same given increment, thus ensuring that the beams emitted simultaneously are projected side by side.In other words, the step size for the mirror between each oscillation is determined by the thickness, or number of pixels, of two lines formed respectively by the reflection of the two light beams.

[0026] According to an optional feature of the invention, the first light-emitting means is configured to receive a first control instruction for the emission of the first light beam, and the second light-emitting means is configured to receive a second control instruction for the emission of the second light beam, said control instructions being synchronized. In other words, the control instruction sent to the first light-emitting means, which may in particular consist of an instruction to activate and set the operating intensity of the light source(s) comprising the light-emitting means, is an instruction that, for a given oscillation of the mirror, depends on the control instruction sent to the second light-emitting means, so that the first and second zones of the projection surface are scanned appropriately to form the desired image.Depending on its shape, and the shape to be given to each of the pixels formed by the reflection of the first and second light beams, the instruction sent to the first means of light emission for a given oscillation of the mirror can be similar to that sent to the second means of light emission.

[0027] According to an optional feature of the invention, the first light emission means and the second light emission means each comprise at least one laser source.

[0028] According to an optional feature of the invention, each of the light emission means comprises several laser sources emitting light beams, as well as a mixing means for combining the light beams in order to form respectively the first light beam and the second light beam.

[0029] For example, the first light emission means comprises a plurality of laser sources and a first mixing means, while the second light emission means also comprises a plurality of laser sources and a second mixing means. The first light beam is thus created by mixing the light rays from the plurality of laser sources and combining them using the first mixing means, while the second light beam is formed by mixing the light rays from the plurality of laser sources and combining them using the second mixing means. By using a plurality of laser sources, it is possible to adjust the color of the light beam according to the laser sources selected and the percentage of their light rays in the final beam.A command instruction sent to one of the light emission means then includes information on the laser source(s) to be activated, and at what intensity, and on the configuration to be given, if applicable, to the mixing means.

[0030] According to an optional feature of the invention, the mixing means each comprise at least one dichroic mirror.

[0031] Dichroic mirrors selectively reflect certain wavelengths while allowing others to pass through, thus enabling light rays to be combined into a beam of light efficiently.

[0032] According to an optional feature of the invention, the mirror of the microelectromechanical device has a size between 4 and 10 mm 2 .

[0033] This preferred mirror size allows for the projection of a sufficiently large spot to minimize the risk of eye damage when observing the light beam. For this size range, the light output is generally between 700 and 2000 lux.

[0034] According to an optional feature of the invention, the mirror of the microelectromechanical device flips between the first position and the second position at a flip frequency between 3 and 15 kHz.

[0035] This frequency is influenced by the size of the mirror, which is between 4 and 10 mm. 2 which tends to reduce the oscillation frequency. However, it is possible, thanks to the system described by the invention, to maintain high resolution even with lower frequencies, in particular those between 3 and 15 kHz.

[0036] According to an optional feature of the invention, the first light-emitting means and the second light-emitting means each comprise a red laser source, a blue laser source, and a green laser source. In this case, both light-emitting means utilize RGB technology. The use of RGB technology allows for dynamic color control for each beam while being energy-efficient.

[0037] Other features, details and advantages of the invention will become clearer upon reading the following description on the one hand, and the illustrative and non-limiting examples of embodiments given with reference to the attached drawings on the other hand, in which:

[0038] [Fig. 1] is a schematic diagram of a motor vehicle lighting system according to the invention;

[0039] [Fig. 2] is a schematic diagram of the operating principle of a mirror of a microelectromechanical device of the automotive vehicle lighting system of Figure 1.

[0040] The features and variants of the invention can be combined in various ways, provided they are not incompatible or mutually exclusive. In particular, variants of the invention may be conceived comprising only a selection of the features described below, isolated from the other described features, if this selection of features is sufficient to confer a technical advantage and / or to differentiate the invention from prior art.

[0041] In the figures, elements common to several figures retain the same reference.

[0042] Figure 1 is a schematic diagram of a lighting system 1 of a motor vehicle according to the invention.

[0043] The motor vehicle lighting system 1 includes a light emission device 2 configured to simultaneously emit at least two distinct light beams, here a first light beam FL1 and a second light beam FL2, and a micro-electromechanical device 26.

[0044] More specifically here, the light emission device 2 comprises a first light emission means 4 and a second light emission means 6. The first light emission means 4 is configured to emit the first light beam FL1, and the second light emission means 6 is configured to emit the second light beam FL2.

[0045] The first light-emitting means 4 comprises at least one laser source, and in this embodiment, a plurality of laser sources. More specifically, it uses RGB (Red, Green, Blue) technology with a blue laser source 8, a green laser source 10, and a red laser source 12. Each of these laser sources produces a light beam corresponding to its specific color: the blue laser source 8 therefore produces a blue light beam, the red laser source 12 produces a red light beam, and the green laser source 10 produces a green light beam. The activation of at least one laser source, here of the three laser sources, is achieved via a control means (not shown here) configured to generate, depending on the need to emit a specific pictogram or signal beam, a command to operate the light-emitting means.This control instruction includes data relating to the activation and operating intensity of each of the laser sources for a given configuration of the electromechanical device as detailed below.

[0046] The light rays emitted by the laser sources of the first light-emitting means 4 are directed to a first mixing means 14, configured to combine these light rays and form the first light beam FL1. The first mixing means 14 comprises, for this purpose, a plurality of dichroic mirrors. Although other mixing technologies can be used, dichroic mirrors are particularly effective at combining the three light rays into a single light beam and directing them in a specific direction.

[0047] In this embodiment, the first mixing means 14 comprises a blue dichroic mirror 141, a green dichroic mirror 142 and a red mirror 143. These mirrors are positioned to intercept the light rays emitted respectively by the blue laser source 8, the green laser source 10 and the red laser source 12. The dichroic mirrors selectively reflect certain wavelengths while allowing others to pass through, making it possible to combine the light rays into a single light beam.

[0048] In the embodiment shown in Figure 1, the blue dichroic mirror 141 and the green dichroic mirror 142 must reflect blue and green light respectively, while allowing other wavelengths to pass through. The red mirror 143, on the other hand, does not need to be dichroic, as it only reflects red light.

[0049] It should be noted that in other embodiments, the red mirror 143 could, however, be dichroic. Indeed, said red mirror 143 can be positioned to allow blue and green light to pass through it, while reflecting the red light. In this case, the red mirror 143 must then be dichroic to allow these wavelengths to pass through. This configuration is particularly advantageous in the generation of white light, where red light is often the limiting component since it represents approximately 50% of the total energy intensity of the FL light beam. Positioning the red mirror 143 to allow blue and green light to pass through thus prevents the red light from passing through other dichroic mirrors, thereby minimizing the loss of light intensity due to attenuation caused by passing through the blue dichroic mirror 141 and the green dichroic mirror 142.

[0050] Similarly, the second means of light emission 6 also uses RGB technology and therefore includes a blue laser source 16 producing a blue light beam, a green laser source 18 producing a green light beam and a red laser source 20 producing a red light beam.

[0051] Each of the light beams emitted by the laser sources of the second light-emitting means 6 is directed to a second mixing means 22 configured to combine the light beams to form the second light beam FL2. The second mixing means 22 also comprises a plurality of dichroic mirrors, although other mixing technologies can be used to efficiently combine the three light beams into a single light beam. In this embodiment, the second mixing means 22 includes a blue dichroic mirror 221, a green dichroic mirror 222, and a red mirror 223, which are positioned to intercept the light beams emitted respectively by the blue laser source 16, the green laser source 18, and the red laser source 20 of the second light-emitting means 6. These mirrors thus combine the three light beams to form the second light beam FL2.

[0052] Similar to the first mixing means 14, the blue dichroic mirror 221 and the green dichroic mirror 222 of the second mixing means 22 are dichroic because they must reflect blue light and green light respectively, while allowing other wavelengths to pass through, whereas the red mirror 223 does not need to be dichroic, since it only has to reflect red light.

[0053] The first light beam FL1 and the second light beam FL2 are both directed respectively by the first mixing means 14 and the second mixing means 22 towards the same mirror 24 of a micro-electromechanical device 26.

[0054] This mirror 24 reflects the first light beam FL1 and the second light beam FL2 towards a projection surface 28, thus allowing the light beams FL1, FL2 to be projected onto this projection surface 28. It should be noted that the micro-electromechanical device 26 can comprise a plurality of mirrors 24, and that the description given for a single mirror also applies to this plurality of mirrors.

[0055] Thus, according to the invention, at least one mirror of a microelectromechanical device is common to two distinct light emission means, it being understood that the light emission means can be considered distinct as long as at least some of their components are distinct. More specifically, it could be envisaged that dichroic mirrors could be common to the two light emission means, provided that laser sources are specific to each of the light emission means and that this distinction allows for distinct light beams to be emitted simultaneously onto a common mirror.

[0056] Figure 2 is a schematic diagram of the operating principle of the mirror 24 of the micro-electromechanical device 26. This figure allows us to better understand how the two light beams FL1, FL2 interact with this mirror 24 in order to form an image projected onto the projection surface 28.

[0057] The mirror 24 of the micro-electromechanical device 26 is designed to oscillate between a first position A and a second position B, this oscillation being controlled by the micro-electromechanical device 26.

[0058] The oscillation of the mirror 24 of the microelectromechanical device 26 allows the projection surface 28 to be scanned with a reflected beam of light. Thanks to the effect of retinal persistence, these lines can contribute to forming a fixed image for the observer, by the addition of different successive lines offset from one another. In order to avoid generating discomfort due to this retinal persistence, the size of the mirror 24 of the microelectromechanical device 26 is between 4 and 10 mm 2 , which results in an oscillation frequency of approximately 3 to 15 kHz.

[0059] According to the invention, an oscillation or tilting of the mirror 24 between these two positions A, B helps to generate two distinct lines, respectively formed by the reflection of the first light beam FL1 and the second light beam FL2.

[0060] This method makes it possible to maintain a high resolution even with a large mirror 24 of the micro-electromechanical device 26, as will be explained in more detail in the following sections of the description.

[0061] When it oscillates between the first position A and the second position B, the first light beam FL1 and the second light beam FL2 are projected onto different places on the projection surface 28.

[0062] More specifically, the mirror 24 of the micro-electromechanical device 26 directs the first light beam FL1 towards a first zone 30 of the projection surface 28, while the second light beam FL2 is projected by the mirror 24 of the micro-electromechanical device 26 onto a second zone 32 of the projection surface 28.

[0063] To ensure that the first beam FL1 and the second beam FL2 are projected onto two distinct areas of the projection surface 28, the light-emitting device 2 directs the light beams FL1, FL2 to two different locations on the mirror 24 of the micro-electromechanical device 26. More specifically, the light-emitting device 2 directs the first light beam FL1 to a first point 241 on the mirror 24 and the second light beam FL2 to a second point 242 on the mirror 24. These two points on the mirror 24 of the micro-electromechanical device 26 are ray focal points that are sufficiently far apart so that when a beam reaches them, the beams reflected by each point on the mirror are directed towards different areas of the projection surface 28.As an example, the two focal points of the distinct light beams are arranged respectively in one half of the mirror which is their own, on either side of a median axis parallel to the orientation of the tilting axis of the mirror.

[0064] It should be noted that when the mirror 24 of the micro-electromechanical device 26 oscillates from the first position A to the second position B, the first light beam FL1 sweeps the first area 30 of the projection surface 28, and the second light beam FL2 sweeps the second area 32 of the projection surface 28.

[0065] To scan the first zone 30 of the projection surface 28, the mirror 24 of the micro-electromechanical device 26 reflects, in the first position A, the first light beam FL1 onto a first location 301 of the first zone 30. In the second position B, the mirror 24 of the micro-electromechanical device 26 reflects the first light beam FL1 onto a second location 302 of the first zone 30.

[0066] It is therefore understood that, when the mirror 24 of the micro-electromechanical device 26 oscillates between the first position A and the second position B, the first light beam FL1 moves between the first place 301 and the second place 302 of the first area 30 of the projection surface 28. The rapid oscillation of the mirror 24 of the micro-electromechanical device 26 creates the illusion of a first continuous line 304 on the projection surface 28 due to the retinal persistence of the human eye.

[0067] Similarly, in the first position A, the mirror 24 of the microelectromechanical device 26 reflects the second light beam FL2 onto the second zone 32 of the projection surface 28 at a first location 321. When the mirror 24 of the microelectromechanical device 26 is positioned in the second position B, it reflects the second light beam FL2 onto a second location 322 of the second zone 32. Thus, when the mirror 24 of the microelectromechanical device 26 moves from the first position A to the second position B, the second light beam FL2 moves from the first location 321 to the second location 322 of the second zone 32, and the rapid oscillation of the mirror 24 of the microelectromechanical device 26 forms a second continuous line 324 between this first location 321 and this second location 322.

[0068] It should be noted that in this embodiment, the first light beam FL1 and the second light beam FL2 scan the projection surface 28 in parallel. This means that, when the mirror 24 of the microelectromechanical device 26 moves from the first position A to the second position B, the first light beam FL1 moves from the first location 301 to the second location 302 of the first zone 30 of the projection surface 28, and the second light beam FL2 moves from the first location 321 to the second location 322 of the second zone 32 of the projection surface 28, such that the first continuous line 304 and the second continuous line 324 are parallel. It is also understood that, in this embodiment, the first continuous line 304 and the second continuous line 324 are therefore formed simultaneously.

[0069] In this embodiment, the first zone 30 and the second zone 32 of the projection surface 28 are adjacent. Thus, when the light beams FL1, FL2 are projected and the mirror 24 of the micro-electromechanical device 26 oscillates between the first position A and the second position B, the first continuous line 304 and the second continuous line 324, formed respectively by the first light beam FL1 and the second light beam FL2, are also adjacent.

[0070] By using both the first light beam FL1 and the second light beam FL2, reflected by the same mirror 24 of the micro-electromechanical device 26 and projected onto the projection surface 28, we therefore double the total number of projected lines for a given oscillation frequency since each oscillation thus forms two distinct lines, namely the first continuous line 304 and the second continuous line 324.

[0071] As previously mentioned, the control instruction sent to a light-emitting means includes data relating to the activation and operating intensity of each laser source, and this control instruction is linked to the orientation of the electromechanical device's mirror. For example, a different control instruction can be sent to the light-emitting means when the mirror performs a new oscillation, so as to form a continuous line of a different color or size and contribute to forming a visual object of the appropriate shape and color. The control instructions sent simultaneously to the two light-emitting means are independent of each other and, depending on the shape to be projected onto the projection area by the light system, they can be similar or distinct.In other words, if the two light beams are said to be distinct, forming two different pixels in the projected image for the same mirror oscillation, it is because they are emitted simultaneously at two distinct points of the mirror.

[0072] The new oscillation of the mirror is achieved by shifting its orientation so that the new lines formed on the projection area are offset by a given step, perpendicular to the direction of the lines. It should be noted that, according to the invention, shifting the mirror's orientation by a given step affects the formation of two continuous lines, each formed by the reflection of the two light beams. This approach is particularly advantageous when using a large mirror 24 in the microelectromechanical device 26, as it allows for maintaining high resolution. For example, with a 4 mm mirror 2The invention allows the projection of up to 800 lines per image at a frequency of 15 kHz with a light intensity of 700 lux. In comparison, using a single light beam with a mirror of this size would produce only 400 lines per image for the same frequency and light intensity. Thus, this solution not only preserves high image resolution while maintaining high projection brightness, but also reduces risks to eye safety thanks to the use of a larger mirror.

[0073] As described above, the present invention achieves its intended purpose by providing a light-emitting device that emits at least two light beams directed towards a mirror, which then projects these beams onto a projection surface. Indeed, by using at least two light beams, the invention makes it possible to obtain a high-resolution image, regardless of the size of the mirror used. This allows the use of a large mirror to ensure eye safety while maintaining a high resolution of the projected image.

[0074] The present invention is not limited to the means and configurations described and illustrated herein, and also extends to any equivalent means and configuration as well as any technically operative combination of such means.

Claims

DEMANDS 1. A motor vehicle lighting system (1) comprising a microelectromechanical device (26), having a mirror (24) configured to tilt between a first position (A) and a second position (B), and at least one first light-emitting means (4) and a second light-emitting means (6) distinct from each other and respectively configured to emit a first light beam (FL1) and a second light beam (FL2) towards the mirror (24) of the microelectromechanical device (26), said mirror (24) reflecting each of the light beams (FL1, FL2) such that the tilting of the mirror causes said light beams to be swept onto a projection surface (10), the first light beam (FL1) being directed onto the mirror (24) of the microelectromechanical device (26) at a first point (241) of the mirror (24), and the second light beam (FL2) being directed onto a second point (242) of the mirror (24), distinct from the first point (241).

2. Light system (1) of motor vehicle according to claim 1, wherein, for a given tilting of the mirror between the first position (A) and the second position (B), the first light beam (FL1) sweeps a first area (30) of the projection surface (28) and the second light beam (FL2) sweeps a second area (32) of the projection surface (28) distinct from the first area.

3. Lighting system (1) of motor vehicle according to any one of claims 3 or 4, wherein the first zone (30) of the projection surface (28) and the second zone (32) of the projection surface (28) are adjacent zones.

4. Light system (1) of motor vehicle according to any one of claims 1 to 3, wherein the first point (241) on which the first light beam (FL1) is directed and the second point (242) on which the second light beam (FL2) is directed are arranged on either side of a median axis of the mirror (24) parallel to the direction of a tilting axis of said mirror.

5. A motor vehicle lighting system (1) according to any one of claims 1 to 4, wherein the tilting of the mirror (24) is configured so that the first beam luminous beam (FL1) and the second luminous beam (FL2) respectively reflected by the mirror (24) form parallel lines on the projection surface (28).

6. Motor vehicle lighting system (1) according to any one of claims 1 to 5, wherein the first light-emitting means (4) and the second light-emitting means (6) comprise at least one laser source (8, 10, 12, 16, 18, 20).

7. Light system (1) of motor vehicle according to claim 6, in which each of the light emission means (4, 6) comprises several laser sources (8, 10, 12, 16, 18, 20) emitting light beams, and a mixing means (14, 22) for combining the light beams to form respectively the first light beam (FL1) and the second light beam (FL2).

8. Motor vehicle lighting system (1) according to claim 7, wherein the mixing means (14, 22) each comprise at least one dichroic mirror (141, 142, 143, 221, 222, 223).

9. A motor vehicle lighting system (1) according to any one of claims 1 to 8, wherein the mirror (24) of the micro-electromechanical device (26) has a size between 4 and 10 mm 2 .

10. Light system (1) of motor vehicle according to any one of claims 1 to 9, wherein the mirror (24) of the micro-electromechanical device (26) switches between the first position (A) and the second position (B) at a switching frequency between 3 and 15 kHz.

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