A projection device, vehicle lighting and transportation vehicle

Abstract

This application provides a projection device, vehicle lighting, and transportation vehicle. The projection device includes a projection module, a prism assembly, and a position adjustment mechanism. At least a portion of the optical surfaces of the light-incident and / or light-exit portions of the prism assembly are planar. The prism assembly is connected to the position adjustment mechanism, which is configured to switch the prism assembly between at least two positions. When the prism assembly is located in at least one of the at least two positions, the emitted light from the projection module is refracted by the prism assembly. The projection position of the projection device changes as the position of the prism assembly changes. This application uses a prism assembly and a position adjustment mechanism in conjunction. By adjusting the position of the planar prism assembly through the position adjustment mechanism, the projection position of the projection module is adjusted to achieve near-field and far-field projection, while reducing manufacturing costs, reducing space occupation, and avoiding the introduction of aberrations.

Description

Technical Field

[0001] This application belongs to the field of vehicle lighting technology, and particularly relates to a projection device, vehicle lighting, and vehicle. Background Technology

[0002] With the development of automotive intelligence, consumers have developed more personalized demands for car lights. In addition to far-field lighting functions such as low beams, high beams, and cornering lights, intelligent car lights are increasingly incorporating information interaction through road projection. The projected patterns vary in distance depending on the situation, and basic lighting functions limit their ultra-near-field projection capabilities.

[0003] Current solutions for achieving near-field and far-field projection patterns in front of a vehicle include:

[0004] 1. Projection module dimming method: For ultra-near field (3m in front of the vehicle), a larger dimming travel is required, which may increase dimming costs;

[0005] 2. A reflective mirror system is placed in front of the projection module to control the angle of the reflective mirror. However, the reflective mirror system is complex and generally requires two reflective mirrors to work together; the reflective mirror system occupies a large space.

[0006] To address the aforementioned issues, patent application CN216591509U discloses an automotive lighting projection module, comprising a pattern generating device, a projection light path, and a projection adjustment device. The projection distance and angle of the projection module are altered by changing the position of the projection adjustment device. However, this patent only discloses the technical concept of changing the position of the projection adjustment device, and the specification only provides embodiments of rotating the internal reflector or rotating the light source. In practical implementation, many problems still exist, such as the overall size of the module and poor projection effects when switching projection positions. To address this, patent application CN118859614A discloses a projection device, vehicle light, vehicle, and projection method, providing a specific technical solution. It achieves focusing in both the near and far fields while adjusting the projection position using a curved prism. However, this patent uses a curved prism, which needs to simultaneously consider light deflection and focusing. The design and manufacturing of the curved prism surface are prone to deviations, introducing additional aberrations and affecting the projection effect. Utility Model Content

[0007] In view of the above-mentioned technical problems, this application provides a projection device, vehicle lighting fixture and vehicle. Compared with the prior art, this application adopts a prism assembly with the optical surfaces of the light-emitting part and the light-incident part as planes and a position adjustment mechanism, which can also realize near-field and far-field projection functions, while reducing manufacturing costs, reducing space occupation and avoiding the introduction of aberrations.

[0008] To achieve the above objectives, the technical solution of this application is as follows:

[0009] This application provides a projection device, including a projection module, a prism assembly, and a position adjustment mechanism. At least a portion of the optical surfaces of the light-incident portion and / or the light-exit portion of the prism assembly are planar. The prism assembly is connected to the position adjustment mechanism, and the position adjustment mechanism is configured to allow the prism assembly to switch between at least two positions.

[0010] When the prism assembly is located at one of the at least two positions, the light emitted from the projection module is refracted by the prism assembly.

[0011] The projection position of the projection device changes as the position of the prism assembly switches.

[0012] In a preferred embodiment of this application, the prism assembly includes a prism.

[0013] In a preferred embodiment of this application, the prism has a refractive index greater than 1.48 and an Abbe number greater than 50.

[0014] In a preferred embodiment of this application, the prism assembly includes multiple prisms, at least some of which have different Abbe coefficients.

[0015] In a preferred embodiment of this application, at least some of the multiple prisms are installed independently, and / or at least some of the adjacent prisms are fixedly attached to each other.

[0016] More preferably, the light-incident portion of the prism is a plane or a stepped surface, and the light-exit portion of the prism is a plane or a stepped surface;

[0017] The stepped surface includes an end face and a connecting surface, the connecting surface connects adjacent end faces, and when the prism assembly is located at a position that allows the emitted light from the projection module to be refracted by the prism assembly, at least a portion of the end face of the stepped surface facing / away from the projection module is a plane.

[0018] In a preferred embodiment of this application, the mating surfaces of adjacent prisms that are surface-mounted are planar.

[0019] Preferably, the opposing optical surfaces of adjacent prisms that are surface-mounted and fixed are parallel to each other.

[0020] In a preferred embodiment of this application, the angle between the optical surfaces of the light-incident portion and the light-exit portion of the prism assembly is A, and the angle between the light-incident portion and the light-exit portion of one prism in the prism assembly is B. The angle B is greater than the angle A, and the angle A is greater than 0° and less than or equal to 40°.

[0021] In a preferred embodiment of this application, the prism assembly includes a first prism and a second prism, wherein the absolute value of the difference between the Abbe coefficient of the first prism and the Abbe coefficient of the second prism is greater than 20.

[0022] In a preferred embodiment of this application, the refractive index of the first prism is less than 1.6, and the refractive index of the second prism is greater than 1.5.

[0023] In a preferred embodiment of this application, the Abbe coefficient of the first prism is greater than 50, and the Abbe coefficient of the second prism is less than or greater than 50.

[0024] In a preferred embodiment of this application, the first prism is made of crown glass and the second prism is made of flint glass.

[0025] In a preferred embodiment of this application, at least a portion of the light-incident portion and the light-exit portion of the prism have an anti-reflection coating.

[0026] In a preferred embodiment of this application, the angle between the light emitted from the projection module after refraction by the prism assembly and the light emitted from the projection module is a deflection angle, wherein the deflection angle is greater than 0° and less than or equal to 15°.

[0027] Based on the same concept, a second aspect of this application provides a vehicle lighting fixture, including a projection device as described in any embodiment.

[0028] Based on the same concept, a third aspect of this application provides a means of transportation, including vehicle lights as described in any embodiment.

[0029] Because this application adopts the above technical solution, it has the following advantages and positive effects compared with the prior art:

[0030] The projection device provided in this application includes a projection module, a prism assembly, and a position adjustment mechanism. The position adjustment mechanism can adjust the position of the prism assembly to adjust the position of the projected pattern on the projection module, thereby achieving a change in the position of the projected pattern as the position of the prism assembly changes. When the prism assembly is in at least one position, the emitted light from the projection module is refracted by the prism assembly. Therefore, by adjusting the position of the prism assembly through the position adjustment mechanism, this application can achieve switching of the projection position of the projection device, thereby enabling switching between near-field and far-field modes.

[0031] For example, the position adjustment mechanism can switch the prism between at least a first position and a second position. When the position adjustment mechanism adjusts the prism assembly to the first position, the light rays emitted from the projection module are refracted by the prism assembly, deflected, and projected onto a position in front of the projection module, i.e., the first projection position. When the position adjustment mechanism adjusts the prism assembly to the second position, the light rays emitted from the projection module are directly projected onto the second projection position without passing through the prism assembly. The first projection position is closer to the projection module than the second projection position. In some variations, the second projection position may also be closer to the projection module than the first projection position.

[0032] Therefore, this application achieves near-field and far-field switching through a mirror system, reducing the space occupied by the structure.

[0033] At least some of the optical surfaces of the light-incident and / or light-excising parts of the prism in the prism assembly are planar, which is simpler to manufacture and reduces costs compared to curved prisms, making it more economical; at the same time, it avoids introducing additional aberrations that affect the projection effect.

[0034] The automotive lighting and vehicles provided in this application have the same technical effects as the aforementioned optical components. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the near-field projection mode of the projection device according to an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the far-field projection mode of the projection device according to an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of one embodiment of the prism assembly in this application. Figure 1 ;

[0038] Figure 4 This is a schematic diagram of one embodiment of the prism assembly in this application. Figure 2 ;

[0039] Figure 5 Installation illustration of another embodiment of the prism assembly of this application. Figure 1 ;

[0040] Figure 6 Installation illustration of another embodiment of the prism assembly of this application. Figure 2 ;

[0041] Figure 7 This is a schematic diagram of another embodiment of the prism assembly of this application.

[0042] Explanation of reference numerals in the attached drawings: 1-Projection module; 2-Prism assembly; 201-Prism; 202-Prism; 203-First prism; 204-Second prism; 3-Position adjustment mechanism; 4-First position; 5-Second position; 6-Ray emitted from the projection module; 7-Stepped surface; 701-End face; 702-End face; 8-First optical surface; 9-Second optical surface; 10-Light incident part of the prism assembly; 11-Light emitting part of the prism assembly; 12-Light incident part of the prism; 13-Light emitting part of the prism. Detailed Implementation

[0043] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of a projection device, automotive lighting fixture, and vehicle according to this application. Identical or similar reference numerals denote identical or similar components. The following description of this application with reference to the accompanying drawings is intended to explain the overall concept of this application and should not be construed as a limitation thereof.

[0044] According to the general concept of this application, a projection device is provided, including a projection module, a prism assembly, and a position adjustment mechanism. The prism assembly is connected to the position adjustment mechanism, which is configured to switch the prism assembly between at least two positions. When the prism assembly is in one of the at least two positions, the emitted light from the projection module is refracted by the prism assembly. The projection position of the projection device changes as the position of the prism assembly switches.

[0045] The position adjustment mechanism of this application can adjust the position of the prism assembly to adjust the position of the projected pattern of the projection module, thereby realizing the change of the projected pattern position with the position of the prism assembly. By adjusting the position of the prism assembly through the position adjustment mechanism, the projection position of the projection device can be switched, thus enabling the switching between near-field and far-field modes. Compared with achieving near-field and far-field switching through a reflector system, this reduces the structural space occupied.

[0046] Meanwhile, at least a portion of the optical surfaces of the light-incident and / or light-exit portions of the prism in this application's prism assembly are planar. This means that this application uses a prism with at least a portion of its optical surfaces being planar, which reduces the manufacturing cost of the prism, making it economical, and also avoids introducing additional aberrations. The projection module of this application can employ high-resolution imaging technologies such as miniLED, microLED, DMD, LCOS, and LCD, achieving high-resolution near-field and far-field projection. This application can be applied to projection modules using different imaging technologies, which will not be elaborated upon here. In some variations, this application can also be applied to vehicle lights with only a few light sources for conventional lighting functions.

[0047] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a full understanding of the embodiments disclosed herein. It will then be apparent that one or more embodiments may be practiced without these specific details.

[0048] Example 1

[0049] See Figure 1-2 The diagram illustrates the projection device of Embodiment 1 of this application, including a projection module 1, a prism assembly 2, and a position adjustment mechanism 3.

[0050] The projection module 1 is capable of projecting patterns with hundreds of pixels, tens of thousands of pixels, or millions of pixels. That is, the projection module 1 of this application can project patterns with different resolutions and pixel counts, which will not be elaborated here. At least a portion of the optical surfaces of the light-incident part and / or light-excising part of the prism assembly 2 are planar. The prism assembly 2 is connected to the position adjustment mechanism 3, which is configured to adjust the position of the prism assembly 2, so that the prism assembly 1 switches between at least two positions to adjust the projection position of the projection module 1 and realize different projection modes.

[0051] Specifically, for example Figure 1-2 The prism assembly 2 has at least a first position 4 and a second position 5. For example... Figure 1 As shown, when the prism assembly 2 is in the first position 4, the prism assembly 2 is in front of the projection module 1. The light rays 6 emitted from the projection module are refracted by the prism assembly 2, deflected downwards, and projected onto the first projection position in front of the projection module 1.

[0052] like Figure 2 As shown, when the prism assembly 2 is in the second position 5, the light 6 emitted from the projection module is directly projected to the second projection position in front of the projection module without passing through the prism assembly 2.

[0053] In one embodiment where projection module 1 is applied to vehicle lights, the light beam 6 emitted from the projection module is refracted by prism assembly 2, causing it to deflect downwards and project onto the ground in front of the vehicle lights—this is the near-field projection mode. Conversely, the light beam 6 emitted from the projection module is directly projected onto the front of the vehicle lights without passing through prism assembly 2—this is the far-field projection mode. In some specific applications, the near-field projection mode can be used to project welcome animations, interactive information, etc.; the far-field projection mode can be used for the lighting function of the vehicle lights. It should be understood that this application does not limit the pattern content and lighting function of projection module 1.

[0054] In this embodiment, the first projection position is closer to the projection module than the second projection position. However, this application does not limit the direction in which the light rays emitted from the projection module 6 are deflected by the prism assembly 2. As shown in Figure 1, if the light rays emitted from the projection module 6 are deflected downwards by the prism assembly 2, the first projection position is closer to the projection module than the second projection position; if the light rays emitted from the projection module are deflected upwards by the prism assembly, the first projection position is farther from the projection module than the second projection position. Figure 1 As shown, the angle between the light ray 6 emitted from the projection module and the light ray 6 emitted from the projection module after refraction by the prism assembly 2 is the deflection angle α. The deflection angle α defines the relative positional relationship between the first projection position and the second projection position. In practical applications where the near-field projection mode is used to project welcoming animations, interactive information, etc., and the far-field projection mode is used for the lighting function of vehicle lights, in order to meet the positional requirements of the lighting and projection functions, the deflection angle α can be greater than 0° and less than or equal to 15°.

[0055] One preferred embodiment, such as Figure 3-4 As shown, the prism assembly 2 includes a prism 201. The light rays 6 emitted from the projection module are projected onto the first optical surface 8 of the prism 201. The emitted light rays are refracted within the prism 201 and exit from the second optical surface 9 of the prism 201. The exited light rays are deflected downwards compared to the light rays 6 emitted from the projection module and are projected onto the ground in front of the projection module 1. In this case, the first optical surface 8 is the light-incident portion of the prism 201, and the second optical surface 9 is the light-exiting portion of the prism 201. Since light is reversible, in some variations, the light rays 6 emitted from the projection module enter from the second optical surface 9 of the prism 201 and exit after being refracted by the first optical surface 8 of the prism 201. The exited light rays are deflected downwards compared to the light rays 6 emitted from the projection module and are projected onto the ground in front of the projection module 1. In this case, the second optical surface 9 is the light-incident portion of the prism 201, and the first optical surface 8 is the light-exiting portion of the prism 201. The angle between the light-incident and light-excising parts of prism 201 (the apex angle of prism 201) can be greater than 0° and less than or equal to 40° to satisfy the aforementioned deflection angle α range. Since light of different frequencies has different refractive indices in the medium, and the geometry of the prism further separates light with different refraction angles, a single prism 201 may easily cause light dispersion. In order to reduce the dispersion of light after the projection module 1 passes through prism 201, preferably, the refractive index of prism 201 is greater than 1.48 and the Abbe number is greater than 50.

[0056] Furthermore, at least a portion of the optical surfaces of the light-incident portion and / or light-exit portion of the prism 201 can be planar. The optical surface of the light-incident portion of the prism 201 can be entirely planar, or it can be partially planar, for example, the central portion of the optical surface can be planar; or, for example, the peripheral portion of the optical surface can be planar. Many more variations are possible in this application, which will not be elaborated here. The optical surface of the light-exit portion of the prism 201 can also be entirely planar, and the optical surface of the light-incident portion of the prism 201 can also be partially planar.

[0057] To reduce the thickness and space occupied by the prism assembly 2, the light-incident portion and / or light-exit portion of the prism 201 can be stepped surfaces (stepped surfaces of prism assemblies with individual prisms are not shown in the diagram, but can be referenced). Figure 7 The stepped surface includes an end face and a connecting surface, with the connecting surface connecting adjacent end faces. When the prism assembly 2 is positioned such that the light rays 6 emitted from the projection module are refracted by the prism assembly 2, at least a portion of the end face of the stepped surface facing / away from the projection module 1 is planar (i.e., at least a portion of the optical surface is planar). Thus, the optical surfaces of the light-incident / light-exit portion are formed through the end face of the stepped surface. Taking the light-incident portion as an example, the stepped surface is equivalent to dividing the original light-incident portion into multiple small end faces in a stepped manner. At the same time, the connecting surface of the stepped surface allows the end face to be closer to the light-exit portion of the prism (and...). Figure 6 (As shown in the comparison with the first prism 203), thus reducing the thickness of the prism. Furthermore, all end faces of the stepped surface can also be planes. Compared with ordinary plane prisms, the stepped surface configuration has the advantages of smaller size and lighter weight, reducing the space occupied by prism 201.

[0058] In another preferred embodiment, such as Figure 5-7 As shown, the prism assembly 2 includes multiple prisms 202, each with a different Abbe coefficient. The multiple prisms 202 also deflect the light rays 6 emitted from the projection module as they pass through the prism assembly 2. Furthermore, by setting different Abbe coefficients, light of different frequencies is separated in one prism, and then the refraction angle of different colors of light is adjusted by another lens, thereby compensating for any dispersion that may occur with a single prism.

[0059] Preferably, at least some of the prisms 202 in the multi-prism assembly 202 can be installed independently, and the relative optical surfaces of adjacent independently installed prisms 202 can be parallel or non-parallel. The position adjustment mechanism 3 adjusts the position of the prism assembly 2 as a whole, or the position adjustment mechanism 3 can also adjust at least some of the prisms 202 individually. In some variations, the surfaces of at least some of the prisms 202 in the multi-prism assembly 2 are bonded and fixed together to form the prism assembly 2. For example, adhesive can be used to bond and fix the surfaces of adjacent prisms 202, and the bonding surfaces of adjacent prisms 202 are parallel and fixedly connected to each other. The adhesive bonding method is more stable than the independent installation method and can avoid errors in light refraction caused by tolerance issues in independent installation. All the prisms 202 in the prism assembly 2 can be installed independently (e.g., Figure 5 As shown), all prisms 202 in prism assembly 2 can also be surface-mounted and fixed (e.g. Figure 6 (as shown), or some prisms 202 are installed independently, and some prisms 202 are fixedly attached to the surface. This application is not limited to this.

[0060] Preferably, at least a portion of the optical surfaces of the light-incident and / or light-exit portions of the prism 202 in the prism assembly 2 can be planar. Further, as... Figure 7 As shown, to reduce the space occupied by the prism assembly 2, at least a portion of the light-incident and / or light-exit portions of the prisms 202 in the prism assembly 2 can be stepped surfaces 7. The stepped surface 7 includes an end face 701 and a connecting surface 702, with the connecting surface 702 connecting adjacent end faces 701. When the prism assembly 2 is positioned such that the emitted light from the projection module 1 is refracted by the prism assembly, the stepped surface 7 is planar, facing (when the light-incident portion is stepped) / facing away (when the light-exit portion is stepped) from at least a portion of the end faces 701 of the projection module 1. Taking the light-incident portion as an example, the stepped surface 7 effectively divides the original light-incident portion into multiple smaller end faces in a stepped manner. Simultaneously, the connecting surface 702 of the steps allows the end face 701 to be closer to the light-exit portion of the prism 202, thereby reducing the thickness of the prism 202. Compared to ordinary planar prisms, the stepped surface 7 has the advantages of smaller size and lighter weight, reducing the space occupied by the prism 202. Specifically, stepped surfaces 7 can be provided on the light-incident and / or light-exiting portions of all prisms 202 in an independently installed prism assembly, or on only some light-exiting or light-incident portions. Preferably, for the surface-fitted and fixed prism assembly 2, the surfaces on which adjacent prisms 202 are fitted and fixed are flat for secure fixing.

[0061] Preferably, such as Figure 6As shown, the angle between the optical surfaces of the light-incident section 10 and the light-exit section 11 of the prism assembly 2 (if the light-incident section / light-exit section is a stepped surface, the combination of the end faces of the stepped surface is the corresponding optical surface of the light-incident section / light-exit section) is A, and the angle between the optical surfaces of the light-incident section 12 and the light-exit section 13 of one prism 202 in the prism assembly 2 is B. The angle B is greater than the angle A, which can realize the inverted installation of the current prism 202 and its adjacent prism 202. The inverted installation of the current prism 202 and its adjacent prism 202 makes it possible that after the light of different frequencies is separated in the current prism 202, the inverted adjacent prism reduces the separation angle of the light of different frequencies. Thus, by ensuring that the dispersion of a specific wavelength is canceled through the current prism 202 and its adjacent prism 202 to achieve dispersion compensation, the light is deflected at a predetermined angle. Furthermore, the included angle A can be greater than 0° and less than or equal to 40°, thereby controlling the deflection angle of the emitted light 6 from the projection module.

[0062] In some specific implementations, in embodiments where the prism assembly 2 includes multiple prisms 202, the larger the difference in Abbe coefficients between the prisms 202 in the prism assembly 2, the better. Since the dispersion effects of the multiple prisms 202 are in opposite directions, the dispersion compensation of the multiple prisms 202 is thus better. Preferably, the difference in Abbe coefficients between the first prism 203 and the second prism 204 is 20 or greater.

[0063] Taking two sheet prisms as an example, see Figure 5-7 As shown, the prism assembly 2 includes a first prism 203 and a second prism 204. To obtain a suitable deflection angle and compensate for dispersion, appropriate Abbe coefficients and refractive indices are required based on the aberration conditions and deflection angle. Preferably, the first prism 203 is a prism with a low refractive index and a high Abbe coefficient, and the second prism 204 is a prism with a high refractive index and a low Abbe coefficient. Both approaches—the first prism 203 being placed near the projection module 1 and the second prism 204 being placed near the projection module 1—can achieve this. Since the light path is reversible, only one prism with a high Abbe coefficient and a low refractive index, along with one prism with a low Abbe coefficient and a high refractive index, are needed to deflect the light while compensating for dispersion.

[0064] Furthermore, to achieve better dispersion compensation, the Abbe coefficient of the first prism 203 can be greater than 50, and the Abbe coefficient of the second prism 204 can be less than 50. The refractive index of the first prism 203 can be less than 1.6, and the refractive index of the second prism 204 can be greater than 1.5. Furthermore, the refractive index and Abbe coefficient are related to the material of the prism; therefore, the materials of the two prisms can be matched. Preferably, the material of the first prism 203 is crown glass, and the material of the second prism 204 is flint glass.

[0065] In this embodiment, regardless of whether the prism assembly 2 includes one prism 201 or multiple prisms 202, the light from the projection module 1 needs to be refracted by each prism. To reduce light energy loss, preferably, at least some of the prisms have an anti-reflection coating on their light-incident and / or light-exit portions. Since the prisms are used to deflect the light emitted from the projection module 6, the anti-reflection coating reduces light reflection, thereby reducing Fresnel loss, and also improves the contrast and brightness of the projected pattern. The anti-reflection coating can be prepared using existing coating methods, such as deposition or spraying.

[0066] In this embodiment, the position adjustment mechanism 3 can be as follows: Figure 1-2 The rotation mechanism, such as a rotary motor or a linear reciprocating motor paired with a transmission assembly, can be used to rotate the output end; this is not limited here. The rotation mechanism controls the rotation of the prism assembly 2. When it rotates to the second position 5, the light rays 6 emitted from the projection module do not pass through the prism assembly 2. When the rotation mechanism controls the rotation of the prism assembly 2 to the first position 4, the light rays 6 emitted from the projection module pass through the prism assembly 2.

[0067] In this embodiment, the position adjustment mechanism 3 can also be a lifting mechanism for adjusting the vertical position of the prism assembly 2, such as a lifting motor, a mechanism with a telescopic rod, or a motor combined with a transmission component to adjust the vertical position of the output end. No limitation is made here. The lifting mechanism controls the vertical movement of the prism assembly 2 by raising and lowering it. Lowering the height controls the downward movement of the prism assembly 2, so that the light rays 6 emitted from the projection module do not pass through the prism assembly 2; raising the height controls the upward movement of the prism assembly 2, so that the light rays 6 emitted from the projection module pass through the prism assembly 2.

[0068] Example 2

[0069] This embodiment provides an automotive lighting fixture, including the projection device of Embodiment 1, to have the same technical effect as the projection device.

[0070] Example 3

[0071] This embodiment provides a vehicle including the automotive lighting fixture of Embodiment 2, to have the same technical effect as the automotive lighting fixture.

[0072] The embodiments of this application have been described in detail above with reference to the accompanying drawings, but this application is not limited to the above embodiments. Even if various changes are made to this application, if these changes fall within the scope of the claims of this application and their equivalents, they shall still fall within the protection scope of this application.

Claims

1. A projection device, characterized by The device includes a projection module, a prism assembly, and a position adjustment mechanism. At least a portion of the optical surfaces of the light-incident and / or light-exit portions of the prism assembly are planar. The prism assembly is connected to the position adjustment mechanism, which is configured to allow the prism assembly to switch between at least two positions. When the prism assembly is located at at least one of the at least two positions, the emitted light from the projection module is refracted by the prism assembly. The projection position of the projection device changes as the position of the prism assembly switches.

2. The projection device according to claim 1, characterized in that, The prism assembly includes a prism.

3. The projection device according to claim 2, characterized in that, The prism has a refractive index greater than 1.48 and an Abbe number greater than 50.

4. The projection device according to claim 1, characterized in that, The prism assembly includes multiple prisms, at least some of which have different Abbe coefficients.

5. The projection device according to claim 4, characterized in that, At least some of the multiple prisms are installed independently; and / or At least some of the surfaces of the multiple prisms are bonded and fixed together.

6. The projection device according to claim 2 or 5, characterized in that, The light-incident portion of the prism is a flat surface or a stepped surface, and the light-exit portion of the prism is also a flat surface or a stepped surface. The stepped surface includes an end face and a connecting surface, the connecting surface connects adjacent end faces, and when the prism assembly is located at a position that allows the emitted light from the projection module to be refracted by the prism assembly, at least a portion of the end face of the stepped surface facing / away from the projection module is a plane.

7. The projection device according to claim 6, characterized in that, The bonding surfaces of adjacent prisms that are surface-bonded are flat.

8. The projection device according to claim 5, characterized in that, The opposing optical surfaces of adjacent prisms that are surface-bonded and fixed are parallel to each other.

9. The projection device according to claim 4, characterized in that, The angle between the optical surfaces of the light-incident part and the light-exit part of the prism assembly is A, and the angle between the optical surfaces of the light-incident part and the light-exit part of one prism in the prism assembly is B. The angle B is greater than the angle A, and the angle A is greater than 0° and less than or equal to 40°.

10. The projection device according to claim 4, characterized in that, The prism assembly includes a first prism and a second prism, wherein the absolute value of the difference between the Abbe coefficient of the first prism and the Abbe coefficient of the second prism is greater than 20.

11. The projection device according to claim 10, characterized in that, The refractive index of the first prism is less than 1.6, and the refractive index of the second prism is greater than 1.

5.

12. The projection device according to claim 10, characterized in that, The Abbe coefficient of the first prism is greater than 50; the Abbe coefficient of the second prism is less than 50.

13. The projection device according to any one of claims 10 to 12, characterized in that, The first prism is made of crown glass, and the second prism is made of flint glass.

14. The projection device according to claim 2 or 4, characterized in that, At least a portion of the light-incident and light-exit portions of the prism have anti-reflection coatings.

15. The projection device according to claim 1, characterized in that, The angle between the light emitted from the projection module after refraction by the prism assembly and the light emitted from the projection module is a deflection angle, which is greater than 0° and less than or equal to 15°.

16. A vehicle lamp, characterized in that, Includes the projection device according to any one of claims 1-15.

17. A means of transportation, characterized in that, Includes the vehicle lights as described in claim 16.

Images