Small vehicle-mounted white light DLP projection and vehicle

Abstract

The utility model belongs to the technical field of DLP projection, and particularly relates to a small vehicle-mounted white light DLP projection and a vehicle, which comprises a shell, a light source, a focusing lens group, a reflector, a DMD module and an imaging lens group, the focusing lens group is arranged on an emergent path of incident light rays emitted by the light source; the reflector is used for receiving and refracting the light focused by the focusing lens group; the DMD module is used for receiving the light reflected by the reflector; and the imaging lens group is used for projecting and imaging an image presented by the DMD module. According to the utility model, through the arrangement of the focusing lens group and the reflectors, the lighting efficiency of the whole projection system is improved, the energy consumption of the whole system is reduced, the cost is saved, and the structure is more compact and portable.

Description

Technical Field

[0001] This utility model relates to the field of DLP projection technology, and in particular to a small vehicle-mounted white light DLP projector and vehicle. Background Technology

[0002] DLP (Digital Light Processing) technology is an advanced display technology that relies on a Digital Micromirror Device (DMD) developed by Texas Instruments (TI) to display visual digital information. In-vehicle DLP projectors offer various personalized lighting modes, such as Spotlight, light carpet effects, and zebra crossing projection, while also providing safety features like low-speed steering assist, blind spot lane departure warning, and trajectory prediction. Dynamic ground projection technology can flexibly display various patterns within a single module, providing a novel lighting experience, such as illuminating the surrounding area or projecting vehicle information (including EV battery level, remaining range, tire pressure warnings, etc.) from side mirrors. This technology supports high-resolution projection, ensuring clearer communication and safer driving.

[0003] Automotive DLP projection technology utilizes a digital micromirror device (DMD) as its core imaging component, achieving digital optical processing by precisely controlling the deflection of the micromirrors. The DMD chip contains millions of tiny mirrors, each capable of independent deflection. Back-end circuitry transmits different signals to a CMOS chip, which in turn controls the deflection of the micromirrors within the DMD chip. The incident light source reflects light through the deflection of the micromirrors, forming an image.

[0004] Existing technology includes Chinese patent CN217060747U, a linear DLP micro-projection optical engine, comprising an illumination module, a light shaping module, a compensation prism, a reflection module, a wedge prism, a DMD display chip, a right-angle prism, and a projection lens. The light beam is emitted from the illumination module, shaped by the light shaping module, and then totally reflected by the inclined surface of the compensation prism onto the reflection module. It is then reflected again by the reflection module back into the compensation prism, and sequentially passes through the wedge prism and the right-angle prism to illuminate the DMD display chip. The imaged light beam is then reflected back to the right-angle prism, and totally reflected by the inclined surface of the right-angle prism to the projection lens for output. It is compact in size and facilitates optimized beam position adjustment, improving light efficiency.

[0005] Chinese patent CN212905879U discloses a DLP micro-projection optical engine with a tower-type optical device, comprising a beam combining module, a beam focusing module, an RTIR prism module for series illumination and projection, a DMD light modulator, and a telecentric projection lens. The plane containing the optical axes of the illumination focusing module, the RTIR prism module, the DMD light modulator, and the telecentric projection lens forms an angle of 35° to 60° with the plane containing the optical axis of the illumination focusing module. This design addresses the inherent problems of poor design stability, difficult assembly processes, and low production yield of conventional DMD light modulators, while retaining the inherent structural stability, reliable design, simple assembly process, and high production yield of the currently mainstream RTIR prism beam combining telecentric optical design framework.

[0006] However, most DLP projection systems employ a combination of wedge prisms and right-angle prisms to achieve light transmission and total internal reflection, with air gaps between the mating surfaces. This method not only adds two extra prisms, affecting light emission efficiency, but also occupies a significant amount of space, hindering component heat dissipation. Furthermore, it increases material costs, complicates assembly, and may affect image projection quality due to accumulated tolerances. Utility Model Content

[0007] The technical problem to be solved by this utility model is: in order to solve the technical problems of low light output efficiency, large space occupation, difficult assembly and the impact of tolerance accumulation on projection effect in the existing technology, this utility model provides a small vehicle-mounted white light DLP projector and vehicle. By arranging the focusing lens group and reflector, the light efficiency of the overall projection system is improved, the energy consumption of the whole system is reduced, the cost is saved, and the structure is more compact and portable.

[0008] The technical solution adopted by this utility model to solve its technical problem is: a small vehicle-mounted white light DLP projector, comprising:

[0009] case;

[0010] light source;

[0011] A focusing lens group, wherein the focusing lens group is disposed on the exit path of the incident light emitted by the light source;

[0012] A reflecting mirror, used to receive and refract light focused by the focusing lens group;

[0013] The DMD module is used to receive light reflected by the reflector.

[0014] An imaging lens group for projecting an image presented via the DMD module;

[0015] The light source and the focusing lens group are arranged sequentially in the housing along the horizontal direction, the DMD module and the imaging lens group are arranged sequentially in the housing along the vertical direction, and the reflector is inclinedly arranged in the housing and faces the DMD module and the focusing lens group.

[0016] The specific technical benefits are as follows: By replacing the two prisms in the existing technology with a single reflector, light absorption loss is reduced, reflection efficiency is improved, and product yield is increased. Furthermore, by reducing the number of components, tolerance accumulation is reduced, providing space for heat dissipation in the module and facilitating heat dissipation from the components within the housing. The tilted reflector allows for a more compact arrangement of the light source, focusing lens group, DMD module, and imaging lens group within the housing, reducing the distance between the illumination optics and imaging optics. This further reduces the overall size of the DLP projection system, making it more compact and portable.

[0017] Furthermore, the light source is a white LED light source.

[0018] The specific technical benefits are: white LED light sources have higher luminous efficacy and lower cost compared to colored light sources.

[0019] Furthermore, the imaging lens group includes an imaging lens barrel, and a first retaining ring, a first lens, a second lens, a second retaining ring, a third lens, a third retaining ring, and a fourth lens coaxially disposed within the imaging lens barrel, wherein the first retaining ring, the first lens, the second lens, the second retaining ring, the third lens, the third retaining ring, and the fourth lens are arranged sequentially along the direction close to the DMD module.

[0020] The specific technical effect is that the lens is installed inside the imaging barrel by a retaining ring to ensure the concentricity between the first lens, the second lens, the third lens and the fourth lens. The better the concentricity, the smaller the imaging deviation, and thus the better the projection effect.

[0021] Furthermore, the imaging lens barrel is threadedly connected to the housing.

[0022] The specific technical benefits are: the use of a threaded connection allows for focusing and lens calibration.

[0023] Furthermore, the focusing lens group includes a sixth lens, a seventh lens, a compound eye lens, and an eighth lens arranged coaxially, and the sixth lens, the seventh lens, the compound eye lens, and the eighth lens are arranged sequentially between the light source and the reflector.

[0024] The specific technical effects are as follows: the light beam is uniformly shaped by the compound eye lens, and then the beam shaped by the compound eye lens is focused into an illumination spot by the eighth lens and then projected onto the reflector; the light beam is focused and collimated by the sixth and seventh lenses.

[0025] Furthermore, the focusing lens group also includes: a first illumination lens barrel and a fourth retaining ring, wherein the compound eye lens and the eighth lens are both disposed within the first illumination lens barrel, and the fourth retaining ring is disposed on the compound eye lens.

[0026] Furthermore, the focusing lens group also includes: a second illumination lens barrel and a fifth retaining ring, wherein the sixth lens and the seventh lens are both disposed within the second illumination lens barrel, and the fifth retaining ring is disposed between the sixth lens and the seventh lens.

[0027] The specific technical effect is as follows: the compound eye lens is installed in the first illumination tube by the fourth retaining ring, and the sixth and seventh lenses are installed in the second illumination tube by the fifth retaining ring, so as to ensure the concentricity between the sixth, seventh, compound eye lenses and the eighth lens. The better the concentricity, the less likely the light source is to defocus, thereby improving the focusing and collimation effect of the light, and making the light that hits the DMD module after being reflected by the mirror more efficient.

[0028] Furthermore, the DMD module includes a DMD chip, a micromirror, and multiple microlenses, all of which are disposed on the DMD chip, and the multiple microlenses are arranged in an array.

[0029] The specific technical effect is that the DMD chip controls the state and flip frequency of the microlens and micromirrors to achieve changes in the projection of images and the output light pattern.

[0030] Furthermore, it also includes: a light source board, a heat sink, and a fan, wherein the light source board is mounted on one end of the housing, the light source is mounted on one side of the light source board, the heat sink is mounted on one end of the housing and located on the other side of the light source board, and the fan is mounted on the heat sink.

[0031] The specific technical effect is that the heat dissipation effect is further increased by setting a heat sink and a fan on one side of the light source board.

[0032] A vehicle comprising a small vehicle-mounted white light DLP projector as described in any of the preceding claims.

[0033] Compared with the prior art, the beneficial effects of this utility model are:

[0034] (1) By replacing the two prisms in the existing technology with a reflector, the absorption loss of light is reduced, the reflection efficiency is improved, and the product yield is improved.

[0035] (2) Furthermore, by reducing the number of components, the tolerance accumulation is reduced, providing space for heat dissipation of the module, which helps to disperse the heat of each component in the housing, saving material costs, reducing the number of parts to be assembled, saving assembly costs, reducing assembly difficulty, and improving production efficiency.

[0036] (3) The tilted reflector allows the light source, focusing lens group, DMD module and imaging lens group to be arranged more closely in the housing, reducing the distance between the illumination optics and imaging optics, thereby further condensing the volume of the entire DLP projection system, making it more compact and portable.

[0037] (4) By arranging compound eye lenses and reflectors, the light efficiency of the overall projection system is improved, the energy consumption of the entire system is reduced, the cost is saved, and the structure is more compact and portable.

[0038] (5) By controlling the angle of the reflector, the light emitted by the light source can be almost entirely focused on the area of ​​the DMD chip after being deflected by the reflector, so that the light can be completely covered on the entire DMD chip. Attached Figure Description

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] Figure 1 This is a schematic diagram of the structure of a small vehicle-mounted white light DLP projector according to the present invention;

[0041] Figure 2 for Figure 1 Optical path diagram of the middle part of the structure;

[0042] Figure 3 This utility model relates to a small vehicle-mounted white light DLP projector that projects an image onto the ground at a height of 0.5m and an angle of 28°.

[0043] In the diagram: 1. Housing; 2. Imaging lens barrel; 3. First retaining ring; 4. First lens; 5. Second lens; 6. Second retaining ring; 7. Third lens; 8. Third retaining ring; 9. Fourth lens; 10. First illumination lens barrel; 11. Light source board; 12. Heat sink; 13. Fan; 14. Reflector; 15. Fifth lens; 16. DMD module; 17. Eighth lens; 18. Fourth retaining ring; 19. Compound eye lens; 20. Second illumination lens barrel; 21. Seventh lens; 22. Fifth retaining ring; 23. Sixth lens; 24. Light source. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0045] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] like Figures 1 to 3 The diagram shows a preferred embodiment of the present invention. This embodiment provides a small vehicle-mounted white light DLP projector, comprising a housing 1, a light source 24, a focusing lens group, a reflector 14, a DMD module 16, and an imaging lens group. The focusing lens group is positioned on the exit path of the incident light emitted from the light source 24. The reflector 14 receives and refracts the light focused by the focusing lens group. The DMD module 16 receives the light reflected by the reflector 14. The imaging lens group projects the image presented by the DMD module 16.

[0048] The light source 24 and the focusing lens group are arranged in sequence in the housing 1 along the horizontal direction, the DMD module 16 and the imaging lens group are arranged in sequence in the housing 1 along the vertical direction, and the reflector 14 is inclinedly arranged in the housing 1 and faces the DMD module 16 and the focusing lens group.

[0049] It should be noted that, see Figure 1As shown, the direction from right to left is the horizontal direction, and the direction from bottom to top is the vertical direction.

[0050] Therefore, by replacing the two prisms in the existing technology with a single reflector 14, light absorption loss is reduced, reflection efficiency is improved, and product yield is increased. Furthermore, by reducing the number of components, tolerance accumulation is reduced, providing space for heat dissipation of the module and facilitating heat dissipation from the components within the housing 1. The tilted reflector 14 allows for a more compact arrangement of the light source 24, focusing lens group, DMD module 16, and imaging lens group within the housing 1, reducing the distance between the illumination optics and imaging optics. This further reduces the overall size of the DLP projection system, making it more compact and portable.

[0051] In this embodiment, the light source 24 is a white LED light source 24.

[0052] Therefore, the white LED light source 24 has higher luminous efficacy and lower cost compared to the colored light source 24.

[0053] In this embodiment, the imaging lens group includes an imaging lens barrel 2, and a first retaining ring 3, a first lens 4, a second lens 5, a second retaining ring 6, a third lens 7, a third retaining ring 8, and a fourth lens 9 coaxially disposed within the imaging lens barrel 2. The first retaining ring 3, the first lens 4, the second lens 5, the second retaining ring 6, the third lens 7, the third retaining ring 8, and the fourth lens 9 are arranged sequentially along the direction close to the DMD module 16.

[0054] Therefore, by using a retaining ring to install the lens inside the imaging barrel 2, the concentricity between the first lens 4, the second lens 5, the third lens 7, and the fourth lens 9 is ensured. The better the concentricity, the smaller the imaging deviation, and thus the better the projection effect.

[0055] In this embodiment, the imaging lens tube 2 is threadedly connected to the housing 1.

[0056] Therefore, the use of a threaded connection structure allows for focusing and lens calibration.

[0057] In this embodiment, the focusing lens group includes a sixth lens 23, a seventh lens 21, a compound eye lens 19, and an eighth lens 17 arranged coaxially. The sixth lens 23, the seventh lens 21, the compound eye lens 19, and the eighth lens 17 are arranged sequentially between the light source 24 and the reflector 14.

[0058] Thus: the light beam is uniformly shaped by the compound eye lens 19, and then the beam shaped by the compound eye lens 19 is focused into an illumination spot by the eighth lens 17 and then hit on the reflector 14; the light beam is focused and collimated by the sixth lens 23 and the seventh lens 21.

[0059] In this embodiment, the focusing lens group further includes: a first illumination lens barrel 10 and a fourth retaining ring 18, with the compound eye lens 19 and the eighth lens 17 both disposed inside the first illumination lens barrel 10, and the fourth retaining ring 18 disposed on the compound eye lens 19.

[0060] In this embodiment, the focusing lens group further includes: a second illumination lens barrel 20 and a fifth retaining ring 22, a sixth lens 23 and a seventh lens 21 are both disposed inside the second illumination lens barrel 20, and the fifth retaining ring 22 is disposed between the sixth lens 23 and the seventh lens 21.

[0061] Therefore, the compound eye lens 19 is installed in the first illumination tube 10 by the fourth retaining ring 18, and the sixth lens 23 and the seventh lens 21 are installed in the second illumination tube 20 by the fifth retaining ring 22, so as to ensure the concentricity between the sixth lens 23, the seventh lens 21, the compound eye lens 19 and the eighth lens 17. The better the concentricity, the less likely the light source 24 is to defocus, thereby improving the focusing and collimation effect of the light, so that the light hitting the DMD module 16 after being reflected by the reflector 14 has a higher light efficiency.

[0062] In this embodiment, the DMD module 16 includes a DMD chip, a micromirror, and multiple microlenses. The micromirror and multiple microlenses are all disposed on the DMD chip, and the multiple microlenses are arranged in an array.

[0063] Therefore, the DMD chip controls the state and flipping frequency of the microlenses and micromirrors to achieve image projection and changes in the output light pattern.

[0064] In this embodiment, a fifth lens 15 is also included, which is mounted on the housing 1 and located above the DMD module 16.

[0065] In this embodiment, it also includes: a light source board 11, a heat sink 12 and a fan 13. The light source board 11 is mounted on one end of the housing 1, the light source 24 is mounted on one side of the light source board 11, the heat sink 12 is mounted on one end of the housing 1 and located on the other side of the light source board 11, and the fan 13 is mounted on the heat sink 12.

[0066] Therefore, the heat dissipation effect is further increased by setting a heat sink 12 and a fan 13 on one side of the light source board 11.

[0067] The optical path schematic diagram of this embodiment is as follows:

[0068] See Figure 2As shown, the light emitted by the light source 24 is focused and collimated by the sixth lens 23 and the seventh lens 21 in sequence, then uniformly shaped by the compound eye lens 19, and then focused into an illumination spot by the eighth lens 17 before hitting the reflector 14. After being reflected by the reflector 14 and refracted by the fifth lens 15, the light hits the DMD module 16. The DMD chip projects the image by controlling the state and flip frequency of the microlens array and micromirrors. The light projected by the chip passes through the fifth lens 15, the fourth lens 9, the third lens 7, the second lens 5 and the first lens 4 in sequence to project the pattern.

[0069] Example 2: A vehicle in this example uses a small vehicle-mounted white light DLP projector of this invention, and therefore also has the above-mentioned advantages.

[0070] In summary, compared with the prior art, the beneficial effects of this utility model are:

[0071] (1) By setting a reflector 14 to replace the two prisms in the existing technology, the absorption loss of light is reduced, the reflection efficiency is improved, and the product yield is improved.

[0072] (2) Furthermore, by reducing the number of components, the tolerance accumulation is reduced, providing space for heat dissipation of the module, which helps to disperse the heat of each component in the housing 1, saving material costs, reducing the number of parts to be assembled, saving assembly costs, reducing assembly difficulty, and improving production efficiency.

[0073] (3) The tilted reflector 14 makes the light source 24, the focusing lens group, the DMD module 16 and the imaging lens group more closely arranged in the housing 1, reducing the distance between the illumination optics and the imaging optics, thereby further condensing the volume of the entire DLP projection system, making it more compact and portable.

[0074] (4) By arranging the compound eye lens 19 and the reflector 14, the light efficiency of the overall projection system is improved, the energy consumption of the entire system is reduced, the cost is saved, and the structure is more compact and portable.

[0075] (5) By controlling the deflection angle of the reflector 14, the light emitted by the light source 24 can be almost entirely focused on the area of ​​the DMD chip after being deflected by the reflector 14, so that the light can be completely covered on the entire DMD chip.

[0076] The above description is based on the preferred embodiments of this utility model. Through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A small vehicle-mounted white light DLP projector, characterized in that, include: Shell (1); Light source (24); A focusing lens group is disposed on the exit path of the incident light emitted by the light source (24); A reflector (14) is used to receive and refract light focused by the focusing lens group; DMD module (16), the DMD module (16) is used to receive light reflected by the reflector (14); An imaging lens group for projecting an image presented via the DMD module (16); The light source (24) and the focusing lens group are arranged in sequence in the housing (1) along the horizontal direction, the DMD module (16) and the imaging lens group are arranged in sequence in the housing (1) along the vertical direction, and the reflector (14) is inclinedly arranged in the housing (1) and facing the DMD module (16) and the focusing lens group.

2. The small vehicle-mounted white light DLP projector as described in claim 1, characterized in that, The light source (24) is a white LED light source (24).

3. A small vehicle-mounted white light DLP projector as described in claim 1, characterized in that, The imaging lens group includes an imaging lens barrel (2) and a first retaining ring (3), a first lens (4), a second lens (5), a second retaining ring (6), a third lens (7), a third retaining ring (8), and a fourth lens (9) coaxially disposed within the imaging lens barrel (2). The first retaining ring (3), the first lens (4), the second lens (5), the second retaining ring (6), the third lens (7), the third retaining ring (8), and the fourth lens (9) are arranged sequentially along the direction close to the DMD module (16).

4. A small vehicle-mounted white light DLP projector as described in claim 3, characterized in that, The imaging lens tube (2) is threadedly connected to the housing (1).

5. A small vehicle-mounted white light DLP projector as described in claim 1, characterized in that, The focusing lens group includes a sixth lens (23), a seventh lens (21), a compound eye lens (19), and an eighth lens (17) arranged coaxially. The sixth lens (23), the seventh lens (21), the compound eye lens (19), and the eighth lens (17) are arranged sequentially between the light source (24) and the reflector (14).

6. A small vehicle-mounted white light DLP projector as described in claim 5, characterized in that, The focusing lens group further includes: a first illumination lens barrel (10) and a fourth retaining ring (18), the compound eye lens (19) and the eighth lens (17) are both disposed inside the first illumination lens barrel (10), and the fourth retaining ring (18) is disposed on the compound eye lens (19).

7. A small vehicle-mounted white light DLP projector as described in claim 5, characterized in that, The focusing lens group further includes: a second illumination lens barrel (20) and a fifth retaining ring (22), the sixth lens (23) and the seventh lens (21) are both disposed inside the second illumination lens barrel (20), and the fifth retaining ring (22) is disposed between the sixth lens (23) and the seventh lens (21).

8. A small vehicle-mounted white light DLP projector as described in claim 1, characterized in that, The DMD module (16) includes a DMD chip, a micromirror and multiple microlenses, all of which are disposed on the DMD chip and arranged in an array.

9. A small vehicle-mounted white light DLP projector as described in claim 1, characterized in that, Also includes: The light source board (11), heat sink (12) and fan (13) are provided. The light source board (11) is mounted on one end of the housing (1). The light source (24) is mounted on one side of the light source board (11). The heat sink (12) is mounted on one end of the housing (1) and located on the other side of the light source board (11). The fan (13) is mounted on the heat sink (12).

10. A vehicle, characterized in that, Including a small vehicle-mounted white light DLP projector as described in any one of claims 1 to 9.

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