Light signal projection unit, vehicle and projection method

Abstract

The invention relates to an optical signal projection unit, a vehicle and a projection method. Wherein the optical signal projection unit comprises a projection part, and the projection part comprises a free-form surface lens piece, a film piece and a projection lens which are sequentially arranged from upstream to downstream; wherein the film piece comprises a light-transmitting area and a non-light-transmitting area, and the shape of the light-transmitting area provides a projection signal pattern of the light signal projection unit; the curved surface structure of the free-form surface lens piece corresponds to the shape of the light-transmitting area of the film piece piece. A light path provided by the light signal projection unit comprises the steps that a light beam is emitted from a light source part, most of the light beam is projected to a light-transmitting area of the film piece after the light beam passes through the free-form surface lens piece, most of the light beam passes through the light-transmitting area and then is emitted through the projection lens, and the light beam passes through the free-form surface lens piece. And providing a projection signal pattern corresponding to the light signal projection unit.

Description

Technical Field

[0001] The present application relates to a light signal projection unit, a vehicle and a projection method. Background Art

[0002] At present, road projection function is increasingly used in car lights, and it is no longer satisfied with being just a welcome light or atmosphere light. Instead, it is used as a communication language. Symbol pattern projection increases the communication and interaction between drivers and other road users, while enhancing the sense of technology, it effectively improves the traffic safety performance of the car, and provides a new direction for the development of intelligent car lights.

[0003] Headlights are important safety parts of vehicles. For projection lights, the regulations have added a new function, the light signal projection function. Specifically, the light signal projection function means working simultaneously with the light signal function to enhance the function of the signal by projecting symbols on the road surface. For example, relevant requirements include working simultaneously with the light signal function to enhance the function of the signal by projecting symbols on the road surface; the light color emitted by the projection function should be the same as the enhanced light signal function and should not cause ambiguity. The projection functions recognized by the regulations include: turn signals, reversing lights, position lights, clearance lights, and side marker lights, and the light color must meet the color coordinate requirements of the corresponding function.

[0004] The current solutions for optical signal projection units include traditional film projection solutions or MLA (muti lens array) projection solutions, but the principles of such solutions are not clear. Figure 1A as well as Figure 1B As shown, Figure 1A As shown, a collimating lens or lens group 21a is used to converge the light emitted by the light source unit 1 (LED) and evenly hit the film sheet 22. At this time, the light spot shape on the film sheet 22 is circular, as shown in FIG. Figure 1B In the middle oblique area, a large amount of light reaching the film is blocked by the non-light-transmitting area 222 of the film, and only the light irradiated to the light-transmitting area 221 of the film can pass through, and then is projected onto the ground through the projection lens to form a projection pattern, providing a light signal projection function. However, the inventors have found that a solution based on this principle will result in low system light efficiency. For scenes with small space arrangements of car lights, due to the low light efficiency (within 5%), the illumination of the ground pattern is within a few hundred lx, and the effect of its light signal projection is poor, which needs further improvement.

[0005] Therefore, the art needs an optical signal projection unit, a vehicle, and a projection method to solve at least one of the above problems. Summary of the invention

[0006] The technical problem to be solved by the present application is to provide a light signal projection unit, a vehicle and a projection method to realize a light signal projection solution with a compact structure and high light efficiency.

[0007] According to the first aspect of the present application, an optical signal projection unit includes a projection part, including: a free-form surface lens component, a film sheet component, and a projection lens, which are arranged in sequence from upstream to downstream; wherein the film sheet component includes a light-transmitting area and a non-light-transmitting area, and the shape of the light-transmitting area provides a projection signal pattern of the optical signal projection unit; the curved surface structure of the free-form surface lens component corresponds to the shape of the light-transmitting area of ​​the film sheet component; the optical path provided by the optical signal projection unit includes: a light beam is emitted from a light source part, and after the light beam passes through the free-form surface lens component, most of the light beam is projected onto the light-transmitting area of ​​the film sheet component, and after most of the light beam passes through the light-transmitting area, it is emitted through the projection lens to provide a projection signal pattern corresponding to the optical signal projection unit.

[0008] The beneficial effects of the technical solution of the optical signal projection unit introduced above include but are not limited to, by arranging a free-form surface lens upstream of the film piece, so that after the light beam passes through the free-form surface lens, most of the light beam is projected to the light-transmitting area of ​​the film piece, and after most of the light beam passes through the light-transmitting area, the optical path structure that exits through the projection lens, that is, the free-form surface optical structure on the free-form surface lens according to the pattern on the film, that is, the corresponding free-form surface lens is designed according to the target pattern, so that the light spot emitted by the light source part is projected to the film position after passing through the free-form surface lens is consistent with the pattern of the film itself, so that most of the light can be projected through the light-transmitting area of ​​the film, thereby improving the light efficiency of the system, thereby improving the illumination of the final projection pattern, and realizing the provision of a light signal projection pattern with high brightness and clear pattern.

[0009] In one or more embodiments of the optical signal projection unit, the projection signal pattern includes a first signal pattern portion and a second signal pattern portion, the light-transmitting area includes a first light-transmitting area and a second light-transmitting area corresponding to the first signal pattern portion and the second signal pattern portion, and the first light-transmitting area is a non-light-transmitting area between the first light-transmitting area and the second light-transmitting area; the free-form surface lens component includes a first curved surface piece corresponding to the first light-transmitting area and the first signal pattern portion, so that after the first light beam passes through the first curved surface piece, most of the first light beam is projected onto the first light-transmitting area of ​​the film sheet, and the free-form surface lens component also includes a second curved surface piece corresponding to the second light-transmitting area and the second signal pattern portion, so that after the second light beam passes through the second curved surface piece, most of the second light beam is projected onto the second light-transmitting area of ​​the film sheet.

[0010] In one or more embodiments of the optical signal projection unit, the light source portion includes an LED light source integrated into a printed circuit board.

[0011] In one or more embodiments of the optical signal projection unit, the free-form surface lens element is fixedly mounted on one side of the printed circuit board, and a heat dissipation structure is provided on the other side of the printed circuit board.

[0012] In one or more embodiments of the optical signal projection unit, a first shell is further included, the first shell is provided with an aperture, and the film sheet is arranged inside the first shell and downstream of the aperture.

[0013] In one or more embodiments of the optical signal projection unit, a second shell is further included, wherein the second shell is adjacently connected to the first shell in the optical axis direction, and a projection lens is disposed in the second shell.

[0014] In one or more embodiments of the optical signal projection unit, the projection lens includes a plurality of lenses, the second housing includes a plurality of sub-housings, and each sub-housing is respectively arranged corresponding to each lens.

[0015] A vehicle according to a second aspect of the present application comprises the light signal projection unit described in the first aspect.

[0016] The beneficial effects of the technical solution of the vehicle introduced above include but are not limited to, due to the use of the light signal projection unit described in the second aspect, the vehicle can provide a light signal projection pattern with higher brightness and clearer pattern to meet regulatory requirements.

[0017] In one or more embodiments of the vehicle, the light efficiency of the light signal projection unit is 25%-30%, and the maximum illumination is 5000lx.

[0018] According to a third aspect of the present application, a light signal projection method is provided, which uses a plurality of light signal projection units according to the first aspect, including a first projection unit and a second projection unit; the projection method comprises:

[0019] When the first signal pattern needs to be projected, a light beam is emitted from the light source portion of the first projection unit. After the light beam passes through the free-form surface lens, most of the light beam is projected onto the light-transmitting area of ​​the film sheet. After most of the light beam passes through the light-transmitting area, it is emitted through the projection lens to provide a first signal pattern corresponding to the optical signal projection unit;

[0020] When it is necessary to project a second signal pattern different from the first signal pattern, a light beam is emitted from the light source part of the second projection unit. After the light beam passes through the free-form surface lens component, most of the light beam is projected onto the light-transmitting area of ​​the film sheet. After most of the light beam passes through the light-transmitting area, it is emitted through the projection lens to provide a second signal pattern corresponding to the optical signal projection unit.

[0021] The beneficial effects of the technical solution of the optical signal projection method introduced above include, but are not limited to, being able to provide different optical signal projection patterns with higher brightness and clearer patterns. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0023] Figure 1A , Figure 1B Schematic diagram of the structure of some optical components in the prior art.

[0024] Figure 2 is a schematic diagram of the assembly structure of the optical signal projection unit of some embodiments.

[0025] Figure 3 is a schematic diagram of the exploded structure of the optical signal projection unit of some embodiments.

[0026] Figure 4 is a schematic cross-sectional structural diagram of an optical signal projection unit in some embodiments.

[0027] Figure 5 Schematic diagram of the structure of a free-form surface lens element of an optical signal projection unit in some embodiments.

[0028] Figure 6 The free-form surface lens element of the optical signal projection unit of some embodiments corresponds to a projection pattern of a plurality of curved surface lenses.

[0029] Fig. 7A , Figure 7B They are respectively a light spot projected onto a film piece by a free-form surface lens of an optical signal projection unit of some embodiments, and a structural schematic diagram of a film piece.

[0030] Figure 8 is a light signal pattern projected onto the ground by the light signal projection unit of some embodiments.

[0031] Reference numerals:

[0032] 10-Light signal projection unit

[0033] 1- Light source

[0034] 2- Projection

[0035] 21-free-form surface lens, 211-first curved surface piece, 212-second curved surface piece, 213-third curved surface piece

[0036] 22-film sheet 221-light-transmitting area, 2211-first light-transmitting area, 2212-second light-transmitting area, 2213-third light-transmitting area, 222-non-light-transmitting area

[0037] 23-projection lens, 231-first lens, 232-second lens

[0038] 200 - beam, 201 - most of the beam, 2011 - first beam, 2012 - second beam, 2013 - third beam, 202 - small part of the beam

[0039] 300 - projected signal pattern, 301 - first signal pattern portion, 302 - second signal pattern portion, 303 - third signal pattern portion;

[0040] 4-Printed Circuit Board

[0041] 5- Heat dissipation structure

[0042] 6-First shell

[0043] 7- second housing, 71- first sub-housing, 72- second sub-housing. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and therefore the present application is not limited to the specific embodiments disclosed below.

[0046] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0047] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, upright, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present application. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0048] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0049] The optical signal projection unit described in the following embodiments takes the structure integrated in the vehicle lamp as an example, for example, it can be integrated and installed in the headlight or taillight, but is not limited to this, and can also be independent of the lamp, for example, installed in the front bumper, rear bumper, exterior rearview mirror, etc.

[0050] refer to Figures 2 to 6 As shown, in some embodiments, the optical component 10 of the lamp includes a projection part 2, including: a free-form surface lens piece 21, a film piece 22, and a projection lens 23 arranged in sequence from upstream to downstream; wherein the film piece 22 includes a light-transmitting area 221 and a non-light-transmitting area 222, and the shape of the light-transmitting area 221 provides a projection signal pattern 300 of the optical signal projection unit 10, and the curved surface structure of the free-form surface lens piece 21 corresponds to the shape of the light-transmitting area 221 of the film piece 22.

[0051] like Figure 4 As shown, the optical path provided by the optical signal projection unit 10 includes: a light beam 200 is emitted from the light source part 1, and after the light beam passes through the free-form surface lens component 21, most of the light beam 201 is projected onto the light-transmitting area 221 of the film sheet 22, and after most of the light beam 201 passes through the light-transmitting area 221, it is emitted through the projection lens 23, providing a projection signal pattern 300 corresponding to the optical signal projection unit 10.

[0052] The meaning of "most of the light beam" is 70% to 95% of the light flux or power of the light beam. It can be understood that most of the light beam 201 is projected to the light-transmitting area 221 of the film sheet 22, that is, only a small part 202 of the light beam is projected to the non-light-transmitting area 222 of the film sheet 22. In addition, as shown in the figure, the source of the light spot projected to the film sheet 22 is only the light beam passing through the free-form surface lens 21, without the influence of other light paths.

[0053] The “upstream” and “downstream” described here are relative to the propagation direction of light, that is, the position closer to the light source unit 1 is upstream.

[0054] like Figures 2 to 4As shown, the light source unit 1 can emit a light beam. The light source unit 1 may include a printed circuit board 4, i.e., a PCB board, integrated with LED light sources. All LED light sources may be integrated on the same PCB board or on different PCB boards. Figures 2 to 4 In the embodiment shown, the light signal projection unit 10 includes a light source 1, which is integrated into the vehicle lamp. However, the light signal projection unit 10 may also include the light source 1 and be independent of the lamp, for example, installed in the front bumper, rear bumper, exterior rearview mirror, etc. The light signal projection unit 10 receives the light beam generated from the light source 1 of the vehicle lamp, such as the headlight or taillight.

[0055] Continue to refer Figures 2 to 4 As shown, for the optical signal projection unit 10 of the integrated light source part 1, in some embodiments, the installation position of the free-form surface lens element 21 can be fixedly installed on one side of the printed circuit board 4, and the other side of the printed circuit board 4 is provided with a heat dissipation structure 5, such as a heat sink. The beneficial effect of this is that the structure of the optical signal projection unit 10 can be made compact to meet the requirements of the layout space in the vehicle.

[0056] Continue to refer Figures 2 to 4 As shown, in some embodiments, the optical signal projection unit 10 may also include a first shell 6, the first shell 6 is provided with an aperture 61, and the film sheet 22 is arranged inside the first shell 6, downstream of the aperture 61. The beneficial effect of setting the aperture 61 is to block the cross-light between patterns to further improve the light efficiency and illumination of the patterns.

[0057] In some embodiments, the optical signal projection unit 10 further includes a second housing 7, which is adjacently connected to the first housing 6 in the light propagation direction, and a projection lens 23 is disposed in the second housing 7. It can be understood that the projection lens 23 can be compactly and reliably fixed by the second housing 7. The specific structure can be that in some implementations, the projection lens 23 includes a plurality of lenses, such as Figures 2 to 4 The first lens 231, the second lens 232, and the second housing 7 shown include a plurality of sub-housings, for example Figures 2 to 4 The first sub-shell 71 and the second sub-shell 72 are shown, and each sub-shell is respectively arranged corresponding to each lens. For example, as shown in the figure, the first sub-shell 71 is arranged corresponding to the fixed first lens 231 , and the second sub-shell 72 is arranged corresponding to the fixed second lens 232 .

[0058] The meaning of the film piece 22 here is similar to the general meaning in this field, that is, the principle of a film-type projector lamp. The film is generally a transparent film with a pattern printed on it. The film-type projector lamp uses the transparent area of ​​the film to transmit the pattern and projects the image to the target area through the projection lens. For example, for a vehicle light signal projection unit, it is generally projected onto the ground.

[0059] The projection lens 23 is used to focus the light output from the transparent area 221 of the film sheet 22 to the projection target area to realize the magnified display of the projection signal pattern. The lens type of the projection lens 23 may be a convex lens. By changing the distance between the convex lens and the film sheet 22 and the projection target area, the focal length and the size of the projected pattern can be changed, but it is not limited to this. For example, it may also include other types of lenses such as concave lenses and aspherical lenses. It can be understood that the number of lenses 23 is not limited to the two lenses shown in the figure, i.e., the first lens 231 and the second lens 232, and can be adjusted according to the actual pattern and light effect requirements.

[0060] The free-form surface lens element 21 is a lens that provides a free-form surface lighting effect. Free-form surface lighting is a lighting method that is significantly different from conventional surfaces such as spheres, paraboloids, spherical surfaces, polynomial surfaces, etc. Free-form surfaces generally refer to complex, unconventional continuous surfaces without rotational symmetry axes. Free-form surfaces can be regarded as composed of many surface pieces under the condition of satisfying certain continuity constraints. Examples of free-form surface descriptions can be hyperbolic surfaces, complex surfaces, XY polynomial surfaces, trapezoidal distortion correction surfaces, Forbes surfaces, Zernike polynomial surfaces, Gaussian basis function composite surfaces, non-uniform rational B-spline surfaces (NURBS surfaces), segmented annular surfaces, and spliced ​​aspheric surfaces, etc. Each surface piece has an independent mathematical expression, so the free-form surface has excellent local operation characteristics, which is convenient for realizing interactive surface modeling with flexible spatial layout and extremely high design freedom. Specifically, the light distribution of the light source and the target illumination area are divided in a certain way according to the light-emitting characteristics of the light source and the target illumination distribution, and the corresponding relationship between the light-emitting angle of the light source and the coordinates of the target illumination point is established according to the law of conservation of energy and the predetermined energy distribution method. Then, based on the corresponding relationship and the law of refraction, the surface data of the free-form surface is obtained through solving and iterative correction algorithms.

[0061] Specifically, refer to Figures 5 to 8As shown, the projection signal pattern 300 may include a plurality of spaced parts. For example, as shown in the figure, the projection signal pattern 300 includes a first signal pattern portion 301 and a second signal pattern portion 302. The light-transmitting area 221 includes a first light-transmitting area 2211 and a second light-transmitting area 2212 corresponding to the first signal pattern portion 301 and the second signal pattern portion 302. The first light-transmitting area 2211 and the second light-transmitting area 2212 are between a non-light-transmitting area 222. The free-form surface lens 21 includes a first curved surface sheet 211 corresponding to the first The light-transmitting area 2211 and the first signal pattern portion 301 make it possible for the first light beam 2011 to project most of the first light beam 2011 onto the first light-transmitting area 2211 of the film sheet 22 after passing through the first curved sheet 211. The free-form surface lens 21 also includes a second curved sheet 212, corresponding to the second light-transmitting area 2212 and the second signal pattern portion 302, so that after the second light beam 2012 passes through the second curved sheet 212, most of the second light beam 2012 is projected onto the second light-transmitting area 2212 of the film sheet 22. The above first signal pattern portion 301, the second signal pattern portion 302 and the corresponding description are only to indicate that a single free-form surface lens 21 can have multiple curved sheets, not limited to two, and can be more or one. For example, as shown in the figure, there can be three, that is, the projected signal pattern 300 includes a first signal pattern portion 301, a second signal pattern portion 302, and a third signal pattern portion 303, and the corresponding free-form surface lens 21 includes a first curved surface piece 211, a second curved surface piece 212, and a third curved surface piece 213. For specific effects, please refer to Fig. 7A As shown, the first light beam 2011, the second light beam 2012, and the third light beam 2013 pass through the first curved surface sheet 211 and the second curved surface sheet 212 respectively. The shape of the light spot of the third curved surface sheet 213 on the film sheet 22 is as shown in FIG. Fig. 7A As shown, Figure 7B The shapes of the first light-transmitting area 2211, the second light-transmitting area 2212, the third light-transmitting area 2213, and the first signal pattern part 301, the second signal pattern part 302, and the third signal pattern part 303 of the film piece 22 are basically the same. For ease of assembly, a large free-form surface lens can be combined through structural design on the basis of three small free-form surfaces and installed in the optical signal projection unit 10.

[0062] As described above, the present application further provides a vehicle including the light signal projection unit 10 described in the above embodiment. The vehicle can provide a light signal projection pattern with high brightness and clear pattern, meeting regulatory requirements.

[0063] like Figure 8As shown, the optical signal projection unit 10 introduced in the above embodiment can achieve a light efficiency (luminous flux projected to the ground / LED output luminous flux) of 25%-30% for the signal projection unit 10, a maximum illumination of 5000lx, uniform pattern illumination, and clear boundaries.

[0064] In addition, it can be understood that in the entire system, it is not limited to a single optical signal projection unit 10, and multiple optical signal projection units can also provide different optical signal projection functions. That is, the present application also provides an optical signal projection method, using multiple optical signal projection units 10 introduced in the above embodiments, including a first projection unit and a second projection unit; the projection method includes:

[0065] When the first signal pattern needs to be projected, the light beam 200 is emitted from the light source part 1 of the first projection unit. After the light beam passes through the free-form surface lens 21, most of the light beam 201 is projected onto the light-transmitting area 221 of the film sheet 22. After most of the light beam 201 passes through the light-transmitting area 221, it is emitted through the projection lens 23 to provide the first signal pattern corresponding to the optical signal projection unit 10.

[0066] When it is necessary to project a second signal pattern different from the first signal pattern, a light beam 200 is emitted from the light source part 1 of the second projection unit. After the light beam passes through the free-form surface lens component 21, most of the light beam 201 is projected onto the light-transmitting area 221 of the film sheet 22. After most of the light beam 201 passes through the light-transmitting area 221, it is emitted through the projection lens 23 to provide a second signal pattern corresponding to the optical signal projection unit 10.

[0067] It can be understood that the different first signal patterns and second signal patterns here refer to the light signal projection function implemented according to regulatory requirements, such as turn light signal projection function, reversing light signal projection function, position light signal projection function, reversing light signal projection function, etc., and are not limited to this.

[0068] As introduced above, the beneficial effects of the optical signal projection unit, vehicle and projection method of the present application include but are not limited to, by arranging a free-form surface lens member upstream of the film piece, so that after the light beam passes through the free-form surface lens member, most of the light beam is projected onto the light-transmitting area of ​​the film piece, and after most of the light beam passes through the light-transmitting area, the light path structure is emitted through the projection lens, that is, the free-form surface optical structure on the free-form surface lens is designed according to the pattern on the film, that is, the corresponding free-form surface lens is designed according to the target pattern, so that the light spot emitted by the light source part and projected onto the film position after passing through the free-form surface lens is consistent with the pattern of the film itself, so that most of the light can be projected through the light-transmitting area of ​​the film piece, thereby improving the light efficiency of the system, thereby improving the illumination of the final projection pattern, and realizing the provision of a light signal projection pattern with higher brightness and clear pattern, and enabling the vehicle to provide a light signal projection pattern with higher brightness and clear pattern, thereby meeting regulatory requirements, and in addition, different light signal projection patterns can also be provided.

[0069] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. An optical signal projection unit (10), characterized in that: include: The projection part (2) comprises: a free-form surface lens (21), a film sheet (22), and a projection lens (23) arranged in sequence from upstream to downstream; The film sheet (22) comprises a light-transmitting area (221) and a non-light-transmitting area (222), and the shape of the light-transmitting area (221) provides a projection signal pattern (300) of the optical signal projection unit (10); The curved surface structure of the free-form surface lens element (21) corresponds to the shape of the light-transmitting area (221) of the film sheet element (22); The optical path provided by the optical signal projection unit (10) comprises: a light beam (200) is emitted from a light source unit (1); after the light beam passes through the free-form surface lens element (21), a majority of the light beam (201) is projected onto a light-transmitting area (221) of the film sheet element (22); after a majority of the light beam (201) passes through the light-transmitting area (221), it is emitted through the projection lens (23), thereby providing a projection signal pattern (300) corresponding to the optical signal projection unit (10).

2. The optical signal projection unit (10) according to claim 1, characterized in that: The projection signal pattern (300) comprises a first signal pattern portion (301) and a second signal pattern portion (302); the light-transmitting area (221) comprises a first light-transmitting area (2211) and a second light-transmitting area (2212) respectively corresponding to the first signal pattern portion (301) and the second signal pattern portion (302); a non-light-transmitting area (222) is located between the first light-transmitting area (2211) and the second light-transmitting area (2212); the free-form surface lens (21) comprises a first curved surface sheet (211) corresponding to the first light-transmitting area (2211) and the first signal pattern portion ( 301), so that after the first light beam (2011) passes through the first curved surface sheet (211), most of the first light beam (2011) is projected onto the first light-transmitting area (2211) of the film sheet (22); the free-form surface lens (21) further comprises a second curved surface sheet (212), corresponding to the second light-transmitting area (2212) and the second signal pattern portion (302), so that after the second light beam (2012) passes through the second curved surface sheet (212), most of the second light beam (2012) is projected onto the second light-transmitting area (2212) of the film sheet (22).

3. The optical signal projection unit (10) according to claim 1, characterized in that: The light source part (1) comprises an LED light source integrated on a printed circuit board (4).

4. The optical signal projection unit (10) according to claim 3, characterized in that: The free-form surface lens element (21) is fixedly mounted on one side of the printed circuit board (4), and a heat dissipation structure (5) is provided on the other side of the printed circuit board (4).

5. The optical signal projection unit (10) according to claim 4, characterized in that: It also includes a first shell (6), the first shell (6) is provided with an aperture (61), and the film sheet (22) is arranged inside the first shell (6) and downstream of the aperture (61).

6. The optical signal projection unit (10) according to claim 5, characterized in that: It also comprises a second shell (7), wherein the second shell (7) is adjacently connected to the first shell (6) in the light propagation direction, and a projection lens (23) is arranged in the second shell (7).

7. The optical signal projection unit (10) according to claim 6, characterized in that: The projection lens (23) comprises a plurality of lenses (231, 232), and the second housing (7) comprises a plurality of sub-housings (71, 72), each sub-housing (71, 72) being arranged corresponding to each lens (231, 232).

8. A vehicle, characterized in that: At least comprises the optical signal projection unit (10) as claimed in any one of claims 1 to 7.

9. The vehicle according to claim 8, characterized in that The light signal projection unit (10) has a light efficiency of 25%-30% and a maximum illumination of 5000 lx.

10. A method for projecting an optical signal, characterized in that: A plurality of optical signal projection units (10) as claimed in any one of claims 1 to 7 are used, including a first projection unit and a second projection unit; the projection method comprises: When it is necessary to project a first signal pattern, a light beam (200) is emitted from the light source part (1) of the first projection unit, and after the light beam passes through the free-form surface lens (21), a majority of the light beam (201) is projected onto a light-transmitting area (221) of the film sheet (22), and after a majority of the light beam (201) passes through the light-transmitting area (221), it is emitted through the projection lens (23), thereby providing a first signal pattern corresponding to the optical signal projection unit (10); When it is necessary to project a second signal pattern different from the first signal pattern, a light beam (200) is emitted from the light source part (1) of the second projection unit. After the light beam passes through the free-form surface lens part (21), a majority of the light beam (201) is projected onto a light-transmitting area (221) of the film sheet part (22). After a majority of the light beam (201) passes through the light-transmitting area (221), it is emitted through the projection lens (23) to provide a second signal pattern corresponding to the optical signal projection unit (10).

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