Projection system for a motor vehicle

Abstract

The invention relates to a projection system 1, comprising: - a laser source (11A, 11B, 11C) configured to emit collimated light rays (Fx'); - a planar oscillating mirror (13) configured to oscillate between multiple positions and to reflect the collimated light rays (Fx') for each of the positions; - a projection assembly (15) for projecting the light rays reflected by the oscillating mirror (13), for each of the positions of the oscillating mirror, so as to project a light pattern (IM) onto a projection support (2), the light pattern being formed by superimposing the reflected and projected light rays for each of the positions of the oscillating mirror; the projection assembly (15) being convergent, such that the light rays projected by the projection assembly converge at a distance d2 that is greater than or equal to the predetermined distance d1 between the projection assembly and the projection support.

Description

Automotive projection system

[0001] The technical context of the present invention is that of automotive equipment. More particularly, the invention relates to a projection system for a motor vehicle comprising at least one laser source. The projection system according to the invention is intended to project a pattern onto a projection surface that may be located inside or outside the vehicle in which the projection system is intended to be mounted.

[0002] In the prior art, projection systems are known for projecting light patterns onto a projection surface. These projection systems may incorporate laser sources to ensure sufficient light intensity for the projected pattern. This ensures good contrast between the projected pattern and the projection surface, thus guaranteeing that the projected pattern is visible to an observer.

[0003] The purpose of these projection systems is to project light patterns onto the projection surface. An observer is therefore expected to look at these light patterns. However, it can happen that an observer looks towards the projection system, and thus at the laser source, rather than towards the projected light patterns. In this situation, the use of a laser source in the projection system can pose a risk to the observer's eye safety.

[0004] Several situations must be considered when assessing the eye risk associated with using a laser source. In one situation, an observer's eye may be at rest, or in another, the observer's eye may be focusing on a component of the projection system. It is essential to ensure that in each of these situations, observing the laser source does not pose a risk to the observer.

[0005] In known projection systems, the laser source can be associated with an oscillating mirror configured to oscillate between several positions and allowing the light rays emitted by the laser source to be reflected for each of the positions, so as to project an image of the light source, and form a light pattern on a projection medium.

[0006] Figure 1 illustrates the oscillating mirror 13 and the observer's eye, represented by the lens L and the retina R. In this figure, the observer's eye is at rest. It can be seen that for each position of the oscillating mirror 13, each position represented by a different dotted line, the light rays from the laser source (not shown) and reflected by the oscillating mirror are focused onto the retina R of the eye. For each of the three positions of the oscillating mirror 13 shown, the reflected rays converge at a point on the retina R, forming a bright spot. Because the oscillating mirror oscillates rapidly, it can assume several positions during a period corresponding to the eye's integration time. Thus, when the oscillating mirror 13 oscillates, the image i formed on the observer's retina R corresponds to the superposition of the bright spots formed during the eye's integration time.The image i is then larger than the image of the laser source, which helps to limit the risk to the eyes.

[0007] However, if the oscillating mirror 13 malfunctions, it can become stuck in one position. In this case, the image formed on the observer's retina R will correspond to the image of the laser source. Indeed, during the eye's integration time, only a bright spot will be produced on the retina, this bright spot being the image of the laser source. This situation presents a real danger to the observer's eye.

[0008] In the figure, we can observe the same projection system with the oscillating mirror 13 and the eye of an observer. This time, the observer's eye is focused on the oscillating mirror 13. The observer's eye is represented by the lens L and its image focal plane f'L, and its retina R.

[0009] It can be seen that for each position of the oscillating mirror 13, each position represented by a different dotted line, the size of the light spot formed on the retina R is identical. The eye's integration time therefore does not allow for an image on the retina larger than the size of the spot formed for each position of the oscillating mirror. The image i formed on the retina R results from the size of the light spot formed by the light rays from the laser source on the oscillating mirror. This spot size is slightly larger than the size of the laser source; however, the size of the resulting image i is too small to allow the projection system to be used without risk to the eye.

[0010] In this case, where the observer's eye focuses on the oscillating mirror, if the oscillating mirror malfunctions and becomes stuck in one position, this does not change the size of the image i formed on the retina. However, as explained, this image size i is too small to guarantee the observer's ocular safety.

[0011] Thus, whatever the situation considered: eye at rest or eye focused on the oscillating mirror, there is always a risk that an observer's eye may see an image i formed by a luminous spot produced by the projection system for a given position of the oscillating mirror.

[0012] This drawback results in the integration of laser sources, particularly in the automotive sector, being regulated and limited. For example, the power of laser sources integrated into automotive lighting devices, such as headlights, used to illuminate the road or make the vehicle visible to other road users, or in projection systems used to project a light pattern inside or outside the vehicle, is greatly limited.

[0013] Due to the limited power of laser sources in projection systems, the contrast of the projected light pattern onto the projection surface may be insufficient. This is particularly true in daylight. The projection surface is already illuminated by ambient light, including sunlight, and significant laser power is required to project a light pattern that contrasts with the already ambient light. Therefore, laser sources are poorly suited for projecting light patterns onto a projection surface, especially in bright daylight. Consequently, the advantages of using such laser sources are limited.

[0014] The invention falls within this context and aims to offer an alternative projection system to known projection systems, intended to be integrated into a motor vehicle, and comprising laser sources enabling the projection of a visible and contrasting light pattern, while ensuring the eye safety of observers.

[0015] To this end, the invention relates to a projection system for a motor vehicle designed to project a light pattern onto a projection support located at a predetermined distance from the projection system, the projection system comprising: - a light emission assembly including at least one laser source and configured to emit collimated light beams; - a plane oscillating mirror, configured to oscillate between several positions and to reflect the collimated light beams emitted by the light emission assembly for each of the positions, and;- a projection assembly configured to project the light rays reflected by the oscillating mirror, for each of the positions of the oscillating mirror, so as to project the light pattern onto the projection support located at said predetermined distance from the projection system, said predetermined distance being considered between the projection assembly and the projection support, the light pattern being formed by the superposition of the reflected and projected light rays for each of the positions of the oscillating mirror; the projection assembly being convergent, so that the light rays projected by the projection assembly converge at a distance greater than or equal to said predetermined distance between the projection assembly and the projection support.;

[0016] It is understood that the projection surface can be the road on which the motor vehicle travels, or a component of that motor vehicle, such as the dashboard. The predetermined distance between the projection surface and the projection assembly is defined by the placement of the projection system on or within the vehicle. This placement is known at the time the projection system is designed. It is therefore possible to size the projection system according to its future placement on or within the vehicle.

[0017] The projection system directs the reflected light rays towards the projection surface, so that the projected light pattern is formed on the projection surface.

[0018] The predetermined distance between the projection system and the projection surface is also called the projection distance. The distance at which the projected light rays converge corresponds to the distance between the projection system and the plane in which the projected light rays converge. This distance is also called the convergence distance of the light rays projected by the projection system.

[0019] The convergence distance is greater than or equal to the predetermined distance between the projection system and the projection surface. For example, the projection system has a focal length greater than the predetermined distance between the projection system and the projection surface. Thus, the light rays reflected by the oscillating mirror, arriving collimated on the projection system, converge at the focal point of the projection system, which is located downstream of the projection surface.

[0020] When an observer is near the projection system, regardless of their position, their eye is located between the projection assembly and the projection surface, but not downstream of the projection surface. Thus, regardless of the observer's position, the projection assembly projects an image downstream of the observer's eye. The projected image is therefore a virtual object for the observer's eye. Consequently, it is not possible for the observer's eye to focus on the image projected by the projection assembly, whether the eye is at rest or focused on the oscillating mirror.

[0021] Because the observer's eye cannot accommodate to a virtual object, the size of the retinal image is increased compared to the case where the eye sees the image of the source as a real object and can then focus on that real object, corresponding to the image of the source. The observer's eye safety is therefore improved.

[0022] According to an example embodiment, the projection assembly includes at least one converging lens and / or at least one converging reflector.

[0023] In the case where the projection assembly is formed by a single lens, then this lens is converging, and it has a focal length greater than the predetermined distance between the optical projection system and the projection support.

[0024] According to an example embodiment, the projection assembly comprises a first optical assembly, a second optical assembly and a translucent screen, interposed between the first optical assembly and the second optical assembly: - the translucent screen having an input face turned towards the first optical assembly and an output face, opposite to the input face, and turned towards the second optical assembly; - an image focus of the first optical assembly being disposed on the output face of the translucent screen, so that the first optical assembly is configured to form an intermediate image of said at least one laser source on the output face of the translucent screen; and - the second optical assembly being configured to project an image of the intermediate image in order to form the light pattern on the projection support.

[0025] Since the projection assembly focuses at a distance greater than the projection distance, the image of the intermediate image is positioned downstream of the projection support.

[0026] In this embodiment, eye safety is further enhanced by the presence of the translucent screen. The translucent screen also prevents an observer's eye from focusing on the image of the laser source. Combining the translucent screen with the projection system according to the invention, which focuses at a distance greater than the projection distance, ensures that even if the translucent screen fails, eye safety remains guaranteed. Indeed, even if the translucent screen malfunctions and an image of the laser source is formed at the projection system, the observer's eye will necessarily be positioned between the projection system and the image of the source projected by the system, preventing the observer's eye from focusing on the laser source image.

[0027] According to one embodiment, the second optical assembly includes an object focus positioned in front of the exit face of the translucent screen.

[0028] Thus, the light rays projected by the second optical assembly, and therefore by the projection assembly, are convergent, while maintaining a focal length less than the projection distance for the second optical assembly, which helps to limit the size of the projection system.

[0029] According to one embodiment, the emission assembly comprises a plurality of laser sources, including a red laser source, a green laser source, and a blue laser source.

[0030] Thus, the emission set can form a luminous pattern in color.

[0031] According to one embodiment, the light emission assembly includes collimating optics associated with each of said at least one laser source, the collimating optics being configured to collimate the light rays emitted by the laser source to which it is associated.

[0032] According to one embodiment, the projection system includes a control unit configured to turn the projection system on and off, and in particular said at least one laser source.

[0033] According to one embodiment, the control unit is configured to prevent the laser source from being activated or to deactivate the laser source when the vehicle in which the projection system is intended to be integrated is not resting on the ground.

[0034] According to one embodiment, the projection system includes a manual deactivation control for the projection system connected to the control unit.

[0035] According to one embodiment, the projection system includes a camera for detecting and measuring a change in the predetermined distance between the projection assembly and the projection support, the control unit being configured to decrease the light power of said at least one laser source or to turn off said at least one laser source, when the measured distance between the projection assembly and the projection support is greater than the convergence distance of the light rays projected by the projection assembly.

[0036] Various embodiments of the invention are envisaged, incorporating, according to all their possible combinations, the different optional features described herein.

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

[0038] Laillustre un partie d'un système de projection avec un miroir oscillant selon l'art antérieur, et l'œil d'un œil d'un œil d'un œil d'un œil d'un œil d'une œil d'une s'il en s'il ...

[0039] Laillustre un partie d'un système de projection avec un miroir oscillant selon l'art antérieur, et l'œil d'un œil d'un œil d'un œil d'un œil d'un œil d'une œil d'une œil oscillant;

[0040] Laillustre a projection system comprising an oscillating mirror and a projection assembly, according to a first embodiment of the invention;

[0041] Laillustre a luminous pattern formed by the projection system illustrated on a projection support;

[0042] The illustration schematically represents the image seen by the eye of an observer when the latter observes a virtual object;

[0043] Laillustre une partie du système de projection de la, et l'œil d'un œil d'un regarder en direction de la système de projection, l'œil d'observateur être à repos;

[0044] Laillustrates a part of the projection system, and the eye of an observer looking in the direction of the projection system, the observer's eye being focused on the oscillating mirror;

[0045] Laillustre a projection system according to the first embodiment in which the projection assembly comprises a first optical assembly, a second optical assembly and a translucent screen interposed between the first optical assembly and the second optical assembly.

[0046] Of course, the features, variants, and different embodiments of the invention can be combined in various ways, provided they are not incompatible or mutually exclusive. In particular, variants of the invention may include only a selection of features, described hereafter in isolation from the other described features, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the prior art.

[0047] In particular, all the variants and embodiments described can be combined with each other if there are no technical obstacles to this combination.

[0048] In the figures, elements common to several figures retain the same reference.

[0049] Figure 1 illustrates a projection system 1 for a motor vehicle according to a first embodiment of the invention. The projection system 1 is intended to be mounted in a motor vehicle. As can be seen in particular in Figure 1, the projection system 1 projects a luminous pattern IM onto a projection surface 2.

[0050] The projection surface 2 can be located inside or outside the vehicle in which the projection system 1 is intended to be mounted. For example, the projection surface 2 can be the road on which the motor vehicle is located or a component of that vehicle, such as a dashboard.

[0051] The projection system 1 includes a light emission assembly 3 configured to emit collimated light rays Fx', a plane oscillating mirror 13 configured to oscillate between several positions and to reflect the collimated light rays Fx' emitted by the light emission assembly 3 for each of the positions it takes, and a projection assembly 15 configured to project the light rays reflected by the oscillating mirror 13, for each of the positions of the oscillating mirror so as to project the light pattern IM onto the projection support 2.

[0052] The light pattern IM is formed by the superposition of the reflected light rays projected by the projection assembly 15, for each of the positions of the oscillating mirror 13.

[0053] The light emission assembly 3 comprises at least one laser source. In the example shown, the light emission assembly 3 comprises a plurality of laser sources, namely, a red laser source 11A, a green laser source 11B, and a blue laser source 11C. Each of the laser sources is associated with a collimation optic 12A, 12B, 12C which allows the light rays emitted by the laser source to be collimated.

[0054] The light emission assembly 3 also includes a first semi-reflective blade 14.1 and a second semi-reflective blade 14.2.

[0055] The light rays 10A emitted by the red laser source 11A are collimated by a first collimating optic 12A, then reflected by the second semi-reflecting plate 14.2 towards the oscillating mirror 13.

[0056] The light rays 10B emitted by the green laser source 11B are collimated by a second collimating optic 12B, then reflected by the first semi-reflecting plate 14.1 towards the oscillating mirror 13.

[0057] The light rays 10C emitted by the blue laser source 11c are collimated by a third collimating optic 12C, then transmitted by the first semi-reflective plate 14.1 and the second semi-reflective plate 14.2 to the oscillating mirror 13.

[0058] Thus, thanks to the semi-reflective plates 14.1 and 14.2, the light rays emitted by each of the laser sources are recombined, so that the light emission assembly 3 emits a single beam Fx' resulting from the emission of each of the laser sources. The use of the red laser sources 11A, green 11B, and blue 11C then makes it possible to form a colored light pattern IM. The color of the light pattern IM can also change over time depending on the amount of red, green, and blue light emitted at any given moment by the laser sources.

[0059] Furthermore, since the light rays emitted by each of the laser sources are collimated by their associated collimating optics, the light beam Fx' emitted by the light emission assembly 3 is collimated. The oscillating mirror 13 then receives this collimated light beam Fx'.

[0060] Since the oscillating mirror is flat, it reflects the light beam Fx' emitted by the light-emitting assembly, while maintaining the collimation of the light beam. The projection assembly 15 then receives a light beam reflected by the oscillating mirror 13, and collimated.

[0061] The projection set 15 is convergent such that the light rays projected by the projection set 15 converge at a convergence distance d2 which is greater than or equal to the projection distance d1, also called the predetermined distance, measured between the projection set 15 and the projection support 2. For example, the projection set 15 has a focal length which is greater than the projection distance d1.

[0062] The projection surface 2 is therefore located upstream of the focal plane of the light rays projected by the projection system. Thus, if an observer looks towards the projection system 1, their eye is necessarily located between the projection surface 2 and the projection system 15, that is, upstream of the convergence plane of the projected light rays. Now, it is precisely the image formed at the convergence plane of the projected light rays that will in turn be perceived by the eye. As this image is located downstream of the observer's eye, it therefore constitutes a virtual object for the eye.

[0063] In the diagram, it is illustrated as a virtual object can be imaged by an eye. In this diagram, we can see that the projection system 1 projects the light rays so as to form an image AB. The eye of an observer, represented by the lens L, as well as its object focal plane fL, its object focal plane F, and its image focal plane f'L and its image focal plane F', is positioned between the projection system 1, and therefore the projection set 15 of the projection system, and the plane in which the light rays converge, and in which the image AB is formed.

[0064] The image AB then becomes a virtual object for the observer's eye. The observer's eye cannot focus on this virtual object. The image of the virtual object AB formed by the observer's eye corresponds to the image A'B'. It can be seen that this image A'B' is not formed at the image focal plane f'L of the eye. The image formed at the retina is therefore always larger than the image of the laser source.

[0065] Thus, thanks to the convergence of the projection assembly 15, and the positioning of the projection support 2 upstream of the focal plane of the light rays projected by the projection assembly 15, the eye safety of an observer can be ensured, regardless of the situation of the eye: at rest or focused on the oscillating mirror.

[0066] The case of the eye at rest is illustrated in Figure 1. We can see the oscillating mirror 13, the converging projection system 15, and the eye of an observer represented by the lens L and their retina R. For each position of the oscillating mirror 13, each position being represented by different dotted lines, the light rays from the laser source, reflected by the oscillating mirror 13 and projected by the projection system 15, are not focused on the retina R, but in front of the retina R. We can therefore see that the bright spot formed on the retina R for each position of the oscillating mirror is magnified compared to the example illustrated in Figure 2, in which the projection system does not include a converging projection system.

[0067] When the oscillating mirror 13 oscillates, the image i formed on the observer's retina R corresponds to the superposition of the light spots formed during the eye's integration time. The image i is then larger than a single light spot, which further limits the risk to the eye, although its effect on eye safety is less significant than when the projection system lacks a converging projection assembly, because each light spot already has larger dimensions.

[0068] In the event of a malfunction of the oscillating mirror 13, it may become stuck in a position. The image formed on the observer's retina R will then correspond to the bright spot formed on the retina for a given position of the oscillating mirror. However, as explained, this bright spot is magnified compared to the image of the laser source due to the positioning of the observer's eye upstream of the convergence plane of the light rays projected by the projection system. Thus, even in the event of a malfunction of the oscillating mirror, the observer's eye safety can be guaranteed.

[0069] The case of the eye focused on the oscillating mirror is illustrated in Figure 1. We can see the oscillating mirror 13, the converging projection system 15, and the observer's eye represented by the lens L and its image focal plane f'L, as well as their retina R. For each position of the oscillating mirror 13, each position being represented by different dashed lines, the light rays from the laser source, reflected by the oscillating mirror 13 and projected by the projection system 15, are not focused on the retina R, but in front of the retina R. We can therefore see that the bright spot formed on the retina R for each position of the oscillating mirror is magnified compared to the example illustrated in Figure 1, in which the projection system does not include a converging projection system.

[0070] When the oscillating mirror 13 oscillates, the image i formed on the observer's retina R corresponds to the superposition of the light spots formed during the eye's integration time. The image i is then larger than a single light spot, which further limits the risk to the eye.

[0071] In the diagram, the solid lines furthest from the optical axis of the projection system allow us to visualize the size of the light spot on the oscillating mirror 13 that corresponds to the superposition of the light spots formed on the retina R for different positions of the oscillating mirror 13, thus taking into account retinal persistence. At the level of the retina R, we can see that we are considering the width formed by the superposition of the light spots induced by the different positions of the oscillating mirror 13. Moving upwards towards the oscillating mirror 13, we can see that the beam size is then much larger than that of the oscillating mirror 13.

[0072] The solid lines closest to the optical axis of the projection system allow us to visualize the size of the light spot on the oscillating mirror 13 that corresponds to the light spot formed on the retina R. Specifically, the width of the light spot formed on the retina R is taken for the central position of the mirror. Moving towards the oscillating mirror 13, we can see that the beam size is then larger than the oscillating mirror 13 at the point of the oscillating mirror. It is therefore clear that the converging projection assembly 15, by projecting an image that corresponds to a virtual object for the observer's eye, magnifies the image of the laser source seen by the observer if they are looking towards the projection system 1. Thus, even if the oscillating mirror 13 is fixed in position, the light spot formed on the retina R is larger than the size of the laser source.

[0073] Thanks to the projection assembly 15, the eye safety of an observer who would observe in the direction of the projection system 1 is therefore ensured.

[0074] The projection assembly 15 may include at least one converging lens and / or at least one converging reflector. If the projection assembly consists of a single lens, then this lens is converging, and it has a focal length greater than the predetermined distance d1 between the optical projection system and the projection support.

[0075] Alternatively, and as illustrated on the, the projection assembly 15 may include a first optical assembly 6, a second optical assembly 7 and a translucent screen 8, interposed between the first optical assembly 6 and the second optical assembly 7.

[0076] According to this alternative, the translucent screen 8 has an input face 81 facing the first optical assembly 6 and an output face 82, opposite the input face, and facing the second optical assembly 7. An image focus F1i of the first optical assembly 6 is disposed on the output face 82 of the translucent screen 8, so that the first optical assembly 6 is configured to form an intermediate image Ix of said at least one laser source 11A, 11B, 11C on the output face 82 of the translucent screen 8.

[0077] The second optical assembly 7 is configured to project an image of the intermediate image Ix in order to form the light pattern IM on the projection support 2. The second optical assembly 7 may have an object focus F2o arranged in front of the output face 82 of the translucent screen, so that the light rays projected by the projection assembly and the second optical assembly 7 are convergent.

[0078] To enhance eye safety, the projection system 1 may also include a control unit 5 configured to activate and deactivate the projection system 1, and in particular the laser sources 11A, 11B, 11C.

[0079] Control unit 5 can be configured to prevent the laser source from being activated or to deactivate the laser source when the vehicle into which the projection system is intended to be integrated is not resting on the ground.

[0080] The control unit 5 thus makes it possible to prevent or stop the operation of the projection system 1 when the vehicle in which the projection system 1 is intended to be integrated is not in a normal operating mode. This embodiment applies in particular in the case where the projection surface 2 is the road on which the vehicle is traveling.

[0081] Indeed, when a vehicle is undergoing maintenance in a garage, an observer's eye could be positioned beyond the convergence distance. This is because, when the vehicle is no longer in contact with the ground, the distance between the projection system and the ground is greater than the predetermined distance between the projection system and the road for which it is designed. In other words, the convergence distance can become shorter than the distance between the projection system and the projection surface, which in this case is the ground. Therefore, an observer could position their eye beyond the convergence distance and focus on an image of the laser source, posing a risk to their eyesight. Automatically deactivating the projection system eliminates this danger.

[0082] The projection system may also include a manual deactivation control for the projection system linked to control unit 5, so that a user can deactivate the projection system if desired.

[0083] This deactivation command can be used by the driver to put the projection system into "maintenance mode," ensuring that the system is deactivated, and in particular that the laser source(s) are deactivated, if necessary. This feature is especially useful if the driver wishes to perform maintenance on the vehicle in which the projection system is intended to be integrated.

[0084] The projection system may also include a camera to detect and measure changes in the projection distance d1 between the projection assembly and the projection surface. The control unit 5 can then be configured to reduce the light output of the laser sources or switch them off when the measured projection distance exceeds the convergence distance d2.

[0085] The camera allows detection of the projection distance d1. If the projection distance d1 changes and becomes greater than the convergence distance d2, then the light power of the laser source(s) is reduced, or even the laser source(s) are turned off to ensure eye safety.

[0086] This projection distance d1 can be modified in particular during the maintenance of the motor vehicle on which the projection system is installed or the maintenance of the projection system.

[0087] For example, consider a projection system mounted on a vehicle to project a light pattern onto the road. During vehicle maintenance, the vehicle may be raised above the ground. This changes the projection distance because the projection system is moved further away from the projection surface, which is the road on which the vehicle is traveling—that is, the ground on which the vehicle rests. The projection distance can then exceed the predetermined distance d1, or even the convergence distance d2. The camera detects this situation, and the control unit 5 of the light emission system can reduce the light output of the laser sources or turn them off completely to prevent them from posing a risk to an observer near the projection system.

Claims

Projection system (1) for a motor vehicle designed to project a light pattern (IM) onto a projection support (2) located at a predetermined distance (d1) from the projection system, the projection system comprising: - a light emission assembly (3) comprising at least one laser source (11A, 11B, 11C) and configured to emit collimated light beams (Fx'); - a plane oscillating mirror (13), configured to oscillate between several positions and to reflect the collimated light beams (Fx') emitted by the light emission assembly for each of the positions, and;- a projection assembly (15) configured to project the light rays reflected by the oscillating mirror (13), for each of the positions of the oscillating mirror, so as to project the light pattern (IM) onto the projection support (2) located at said predetermined distance (d1) from the projection system, said predetermined distance (d1) being considered between the projection assembly (15) and the projection support (2), the light pattern being formed by the superposition of the reflected and projected light rays for each of the positions of the oscillating mirror; the projection assembly (15) being convergent, so that the light rays projected by the projection assembly converge at a distance (d2) greater than or equal to said predetermined distance (d1) between the projection assembly and the projection support.; Projection system (1) according to any one of the preceding claims, wherein the projection assembly (15) comprises at least one converging lens and / or at least one converging reflector. Projection system (1) according to any one of the preceding claims, wherein the projection assembly (15) comprises a first optical assembly (6), a second optical assembly (7) and a translucent screen (8), interposed between the first optical assembly (6) and the second optical assembly (7): - the translucent screen (8) having an input face (81) facing the first optical assembly (6) and an output face (82), opposite to the input face, and facing the second optical assembly (7); - an image focus (F1i) of the first optical assembly (6) being disposed on the output face (82) of the translucent screen (8), so that the first optical assembly (6) is configured to form an intermediate image (Ix) of said at least one laser source (11A, 11B, 11C) on the output face (82) of the translucent screen (8);and- the second optical assembly (7) being configured to project an image of the intermediate image (Ix) in order to form the light pattern on the projection support.; Projection system (1) according to the preceding claim, in which the second optical assembly (7) has an object focus (F2o) disposed in front of the exit face (82) of the translucent screen (8). Projection system (1) according to any one of the preceding claims, wherein the emission assembly comprises a plurality of laser sources, and in particular a red laser source (11A), a green laser source (11B), and a blue laser source (11C). Projection system (1) according to any one of the preceding claims, wherein the light emission assembly comprises a collimating optic (12A, 12B, 12C) associated with each of said at least one laser source (11A, 11B, 11C), the collimating optic being configured to collimate the light rays emitted by the laser source to which it is associated. Projection system (1) according to any one of the preceding claims, comprising a control unit (5) configured to activate and deactivate the projection system, and in particular said at least one laser source (11A, 11B, 11C). Projection system (1) according to the preceding claim, wherein the control unit (5) is configured to prevent the activation of the laser source or to deactivate the laser source when the vehicle in which the projection system is intended to be integrated is not resting on the ground. Projection system (1) according to claim 7 or 8, comprising a manual deactivation control of the projection system connected to the control unit. Projection system (1) according to any one of claims 7 to 9, comprising a camera for detecting and measuring a change in the predetermined distance (d1) between the projection assembly and the projection support, the control unit being configured to decrease the light power of said at least one laser source (11A, 11B, 11C) or to turn off said at least one laser source, when the measured distance between the projection assembly and the projection support is greater than the convergence distance (d2) of the light rays projected by the projection assembly.

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