Film member for projection lamp, preparation method therefor, and projection lamp to which film member is applied

Abstract

A film member for a projection lamp, a preparation method therefor, and a projection lamp to which a film member is applied. The film member comprises a first transparent substrate (1) and a luminous flux control part, wherein the first transparent substrate (1) is provided with a first light-shielding layer (2), the first light-shielding layer (2) is used for being arranged on an image surface of a projection lamp, the first light-shielding layer (2) comprises a first light-transmitting region (3) and a first shielding region (4), and light passes through the film member to form a film pattern; and the luminous flux control part is used for reducing the luminous flux of a preset region in the film pattern. The film member for a projection lamp, the preparation method therefor, and the projection lamp to which a film member is applied have the following advantage: improving the illumination uniformity simply by adding a luminous flux control part, without changing the original structure.

Description

Film for projection lamp, preparation method thereof, and projection lamp using the same Technical Field

[0001] The present invention relates to the technical field of lamp accessories, in particular to a film element for a projection lamp, a preparation method thereof and a projection lamp using the film element. Background Art

[0002] In recent years, consumers' demand for personalized vehicles has become increasingly prominent, and their expectations for car decoration have also become increasingly high. Decorative lighting, especially exterior ambient lighting, is a key means of highlighting individuality and vehicle quality, and is gaining increasing attention from major automakers and consumers. Currently, exterior ambient lighting is most commonly found in the front and rear of vehicles, while areas below the body are relatively less common. Side exterior ambient lighting currently includes decorative handle lights, door projection lights, rearview mirror projection lights, and carpet lights.

[0003] However, the overall uniformity of existing projection lamps is poor; in particular, carpet lamps (carpet lamps are tilted projection lamps with a projection angle generally greater than 70°) usually have an overall uniformity of only 10%. As shown in Figure 7, the front end is brighter and the tail end is darker, and the transition is fast. This is also the main defect of carpet lamps currently on the market. Summary of the Invention

[0004] An object of the present application is to provide a film for a projection lamp, a preparation method thereof, and a projection lamp using the film, which can improve lighting uniformity.

[0005] The technical solution adopted in this application is: a film element for a projection lamp, comprising a first transparent substrate and a light transmittance control unit, wherein a first light-shielding layer is provided on the first transparent substrate, and the first light-shielding layer is used to be arranged on the image plane of the projection lamp; the first light-shielding layer includes a first light-transmitting area and a first shielding area; light forms a film pattern after passing through the film element; the light transmittance control unit is used to reduce the light flux of a preset area in the film pattern.

[0006] Compared with the existing technology, the advantage of the present application is that the original structure does not need to be changed, and the improvement of lighting uniformity can be achieved by simply adding a light transmission control unit.

[0007] In some embodiments of the present application, the light transmission control unit adopts a second shading layer, and the second shading layer is arranged on a side of the first transparent substrate opposite to the first shading layer; the second shading layer includes a first dot matrix density gradient area; the projection of the first light transmission area along the thickness direction of the film overlaps with the projection of the first dot matrix density gradient area along the thickness direction of the film.

[0008] Furthermore, the second shading layer also includes a second shading area; the area of ​​the first shading area projected along the thickness direction of the film is larger than the area of ​​the second shading area projected along the thickness direction of the film, and the projection of the first shading area along the thickness direction of the film completely covers the projection of the second shading area along the thickness direction of the film.

[0009] In some embodiments of the present application, the light transmission control unit includes a second transparent substrate close to the first transparent substrate, and a third shading layer is provided on the second transparent substrate; the third shading layer includes a second dot matrix density gradient area; the projection of the first light transmission area along the thickness direction of the film overlaps with the projection of the second dot matrix density gradient area along the thickness direction of the film.

[0010] Furthermore, the distance between the first light-shielding layer and the third light-shielding layer is in the range of 0.2 mm to 0.7 mm.

[0011] Furthermore, the third shading layer also includes a third shading area; the area of ​​the first shading area projected along the thickness direction of the film is larger than the area of ​​the third shading area projected along the thickness direction of the film, and the projection of the first shading area along the thickness direction of the film completely covers the projection of the third shading area along the thickness direction of the film.

[0012] In some embodiments of the present application, the light transmittance control unit adopts a transparent film layer, which is arranged on a side of the first transparent substrate opposite to the first shading layer; the transparent film layer includes a gradient area with a gradual transparency change, and the projection of the first light transmittance area along the thickness direction of the film overlaps with the projection of the gradient area along the thickness direction of the film.

[0013] The method for preparing a film for a projection lamp obtained by the present invention includes a preparation step and a specific pattern making step;

[0014] The preparation steps include: plating chrome on both sides of the first transparent substrate, then coating with photosensitive adhesive, and finally baking;

[0015] The specific pattern production steps include: respectively laying out drawings for the first light-shielding layer and the second light-shielding layer, then outputting a master, first exposing and copying the first light-shielding layer, then exposing and copying the second light-shielding layer, and then sequentially performing development, chrome removal, glue removal, drying, cutting and cleaning operations.

[0016] A projection lamp obtained by the present invention includes a light source, an illumination lens group, the above-mentioned film for the projection lamp and an imaging lens group in sequence along the optical axis. The projection lamp can form a projection pattern corresponding to the film pattern on a preset projected surface. The projection pattern includes a near lamp end and a far lamp end. The light flux control unit can reduce the luminous flux of a preset area in the film pattern so that the closer the corresponding projection pattern is to the near lamp end, the greater the reduction in illuminance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] [Corrected 11.03.2025 according to Rule 26] Figure 1 is a schematic diagram of the structure of Example 1 of the present invention;

[0018] [Corrected 11.03.2025 according to Rule 26] Figure 2 is a schematic diagram of the structure of Example 2 of the present invention;

[0019] [Corrected 11.03.2025 according to Rule 26] Figure 3 is a schematic diagram of the structure of Example 3 of the present invention;

[0020] [Corrected 11.03.2025 according to Rule 26] Figure 4 is a schematic diagram of the structure of Example 5 of the present invention;

[0021] [Corrected 11.03.2025 according to Rule 26] Figure 5 is a schematic diagram of the front and back surfaces of Example 1 of the present invention;

[0022] [Corrected 11.03.2025 according to Rule 26] FIG6 is a light transmission schematic diagram of the first dot matrix density gradient change area of ​​Example 1 of the present invention;

[0023] [Corrected 11.03.2025 in accordance with Rule 26] Figure 7 is a schematic diagram of the projection effect of a conventional carpet light;

[0024] [Corrected 11.03.2025 according to Rule 26] Figure 8 is a schematic diagram of the projection effect of Example 1 of the present invention.

[0025] In the figure: 1. first transparent substrate; 2. first shading layer; 3. first light-transmitting area; 4. first shielding area; 5. second shading layer; 6. first dot matrix density gradient area; 7. second shielding area; 8. second transparent substrate; 9. third shading layer; 10. second dot matrix density gradient area; 11. third shielding area; 12. transparent film layer; 13. light source; 14. illumination lens group; 15. imaging lens group; 16. first area; 17. second area; 18. third area; 19. fourth area; 20. fifth area. DETAILED DESCRIPTION

[0026] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments. Example 1:

[0027] This embodiment provides a film element for a projection lamp, as shown in FIG1 , comprising a first transparent substrate 1 and a light transmission control unit. A first light-shielding layer 2 is provided on the first transparent substrate 1, and is intended to be positioned on the image plane of the projection lamp. The first light-shielding layer 2 includes a first light-transmitting area 3 and a first shielding area 4. Light passing through the film element forms a film pattern. The light transmission control unit is configured to reduce the luminous flux of a predetermined area within the film pattern. The film pattern refers to the pattern projected after light passes through the first light-transmitting area 3; the predetermined area refers to the area of ​​the film pattern where the luminous flux is to be reduced. Improving illumination uniformity can be achieved by simply adding a light transmission control unit without changing the original structure.

[0028] In order to reliably control the amount of light passing through, the light passing control unit adopts a second shading layer 5, which is arranged on the side of the first transparent substrate 1 opposite to the first shading layer 2; the second shading layer 5 includes a first dot matrix density gradient area 6; the projection of the first light-transmitting area 3 along the thickness direction of the film overlaps with the projection of the first dot matrix density gradient area 6 along the thickness direction of the film. The design of the second light-shielding layer 5 can block the light passing through the first light-transmitting area 3, thereby reducing the amount of light passing through. The first transparent substrate 1 has little change, and there is no need to change the original structure and mold of the projection lamp, which reduces the improvement cost. The second light-shielding layer 5 is arranged on the other side of the first transparent substrate 1 and will not affect the arrangement of the first light-shielding layer 2. The design of the first dot matrix density gradient area 6 can control the amount of light passing through different areas through different dot matrix arrangements, which is convenient for adjusting the amount of light passing through each area. The projection lamp using the film element of the prior art can form a projection pattern by obliquely projecting onto the preset irradiated surface, but the projection pattern is bright near and dark far away, which is uneven. However, the projection lamp using the film element of this embodiment has a second light-shielding layer 5 area corresponding to the bright part of the original projection pattern. The dot matrix on the first light-transmitting area 3 is dense, resulting in a greater reduction in light transmittance. The dot matrix on the second light-shielding layer 5 corresponding to the brighter portion of the original projection pattern is loose, resulting in a smaller reduction in light transmittance. The gradual change in dot matrix density can improve the overall brightness and darkness uniformity of the projected image and make the transition more natural. The projection of the first light-transmitting area 3 along the thickness direction of the film overlaps with the projection of the first dot matrix density gradient zone 6 along the thickness direction of the film, so that the first dot matrix density gradient zone 6 can reduce the brightness of the film pattern. The projection of the first light-transmitting area 3 and the projection of the first dot matrix density gradient zone 6 can either partially overlap, where the first dot matrix density gradient zone 6 only reduces the brightness of a portion of the film pattern, or completely overlap, where the first dot matrix density gradient zone 6 reduces the brightness of the entire film pattern, resulting in a more natural transition. In this embodiment, the projection of the first light-transmitting area 3 along the thickness direction of the film can completely overlap with the projection of the first dot matrix density gradient zone 6 along the thickness direction of the film.

[0029] To simplify the process, the second light-shielding layer 5 also includes a second shielding area 7. The projection of the first shielding area 4 along the film thickness is larger than the projection of the second shielding area 7 along the film thickness, and the projection of the first shielding area 4 along the film thickness completely covers the projection of the second shielding area 7 along the film thickness. The design of the second shielding area 7 reduces the area required for subsequent processing, reducing the cost and time of film processing. The projection of the first shielding area 4 covers and exceeds the projection of the second shielding area 7, ensuring that the second shielding area 7 does not affect the film pattern.

[0030] The film of this embodiment is shown in FIG5 . The left half is the front side, which is positioned on the image plane of the projector. The black portion of the front side is the first shielded area 4, and the white portion in the middle of the black portion of the front side is the first light-transmitting area 3. The right half is the back side. The black portion of the back side is the second shielded area 7, and the blurred triangular area on the back side is the first dot matrix density gradient area 6. As shown in FIG6 , the first dot matrix density gradient area 6 includes, in sequence, a first area 16, a second area 17, a third area 18, a fourth area 19, and a fifth area 20. The dots on the first area 16 to the fifth area 20 are arranged from dense to sparse, resulting in 25% light transmission in the first area 16, 50% light transmission in the second area 17, 80% light transmission in the third area, 90% light transmission in the fourth area, and 95% light transmission in the fifth area. The light transmission of the oblique projection passing through these different areas is relatively uniform when projected onto the ground. The dotted lines in FIG6 do not represent the dot matrix arrangement, but are used to illustrate the area separation. For example, the first area 16 is the area near the bottom dotted line.

[0031] The second shading layer 5 can be either behind the first light-transmitting area 3, where the light first passes through the first light-transmitting area 3 and then the second shading layer 5 reduces the luminous flux, or in front of the first light-transmitting area 3, where the light first passes through the second shading layer 5 to reduce the luminous flux and then passes through the first light-transmitting area 3.

[0032] As shown in Figure 8, this design reduces the brightness at the front of the carpet light while maintaining brightness at the rear, creating a more natural transition and improving overall uniformity by 40%. This can also be applied to products such as car welcome projection lights and interior door panel projection lights. Example 2:

[0033] This embodiment provides a film element for a projection lamp, as shown in FIG2 , comprising a first transparent substrate 1 and a light flux control unit. A first light-shielding layer 2 is provided on the first transparent substrate 1, and is intended to be positioned on the image plane of the projection lamp. The first light-shielding layer 2 includes a first light-transmitting area 3 and a first shielding area 4. Light passing through the film element forms a film pattern. The light flux control unit is configured to reduce the luminous flux of a predetermined area within the film pattern. The film pattern is the pattern projected after light passes through the first light-transmitting area 3; the predetermined area is the area within the film pattern where the luminous flux is to be reduced. Improving illumination uniformity can be achieved by simply adding a light flux control unit without changing the original structure.

[0034] In order to reliably control the amount of light passing through, the light passing control unit includes a second transparent substrate 8 close to the first transparent substrate 1, and a third light-shielding layer 9 is provided on the second transparent substrate 8; the third light-shielding layer 9 includes a second dot matrix density gradient area 10; the projection of the first light-transmitting area 3 along the thickness direction of the film overlaps with the projection of the second dot matrix density gradient area 10 along the thickness direction of the film. The design of the second transparent substrate 8 does not require further processing of the first transparent substrate 1, and the original projection lamp can be directly upgraded by adding the second transparent substrate 8 to ensure the user experience of the old product. The conventional projection lamp film does not need to be discarded and can continue to be used after adding the second transparent substrate 8; the design of the third light-shielding layer 9 can block the light passing through the first light-transmitting area 3, thereby reducing the amount of light passing through. The third light-shielding layer 9 is provided on the second transparent substrate 8, and the processing is simple and convenient; the design of the second dot matrix density gradient area 10, through different dot matrix arrangements, The light transmission amount of different areas can be controlled, facilitating the adjustment of the light transmission amount of each area; the projection of the first light-transmitting area 3 along the thickness direction of the film overlaps with the projection of the second dot matrix density gradient area 10 along the thickness direction of the film, so that the second dot matrix density gradient area 10 can reduce the brightness of the film pattern. The projection of the first light-transmitting area 3 and the projection of the second dot matrix density gradient area 10 can either partially overlap, with the second dot matrix density gradient area 10 only reducing the brightness of a portion of the film pattern, or completely overlap, with the second dot matrix density gradient area 10 reducing the brightness of the entire film pattern, resulting in a more natural transition. In this embodiment, the projection of the first light-transmitting area 3 along the thickness direction of the film can completely overlap with the projection of the second dot matrix density gradient area 10 along the thickness direction of the film; the second transparent substrate 8 abuts the first light-shielding layer 2, making the installation between the first transparent substrate 1 and the second transparent substrate 8 simple and convenient; the third light-shielding layer 9 does not contact the first light-shielding layer 2, preventing mutual collision and wear.

[0035] In order to ensure the control effect, the distance between the first shading layer 2 and the third shading layer 9 is in the range of 0.2mm-0.7mm. When the distance is less than 0.2mm, the projection pattern will form a granular visual effect of light and dark distribution. The smaller the distance, the more obvious the granular effect. This is also the reason why the first dot matrix density gradient area 6 in Example 1 cannot be directly combined with the first light-transmitting area 3. The glass substrate for making film pieces is generally 0.4-0.6mm thick.

[0036] To simplify the process, the third light-shielding layer 9 also includes a third shielding area 11. The projection of the first shielding area 4 along the film thickness is larger than the projection of the third shielding area 11 along the film thickness, and the projection of the first shielding area 4 along the film thickness completely covers the projection of the third shielding area 11 along the film thickness. The design of the third shielding area 11 reduces the area required for subsequent processing, reducing the cost and time of film processing. The projection of the first shielding area 4 covers and exceeds the projection of the third shielding area 11, ensuring that the third shielding area 11 does not affect the film pattern.

[0037] The second transparent substrate 8 and the first transparent substrate 1 can either abut or leave a gap; the third light-shielding layer 9 can be located behind the first light-transmitting area 3, so that light first passes through the first light-transmitting area 3 and then has its light flux reduced by the third light-shielding layer 9; or it can be located in front of the first light-transmitting area 3, so that light first passes through the third light-shielding layer 9 to reduce its light flux and then passes through the first light-transmitting area 3. The improved projection effect is shown in Figure 8. Example 3:

[0038] This embodiment provides a film element for a projection lamp, as shown in Figure 3. The film element includes a first transparent substrate 1 and a light flux control unit. The first transparent substrate 1 is provided with a first light-shielding layer 2, which is intended to be positioned on the image plane of the projection lamp. The first light-shielding layer 2 includes a first light-transmitting area 3 and a first shielding area 4. Light passing through the film element forms a film pattern. The light flux control unit is configured to reduce the luminous flux of a predetermined area within the film pattern. The film pattern is the pattern projected after light passes through the first light-transmitting area 3. The predetermined area is the area within the film pattern where the luminous flux is to be reduced. Improving illumination uniformity can be achieved by simply adding a light flux control unit without changing the original structure.

[0039] To reliably control light transmission, the light transmission control unit utilizes a transparent film layer 12, which is disposed on the side of the first transparent substrate 1 opposite the first light-shielding layer 2. The transparent film layer 12 includes a gradient zone with a gradual change in transparency. The projection of the first light-transmitting zone 3 along the thickness of the film overlaps the projection of the gradient zone along the thickness of the film. The transparent film layer 12 is used to reduce light flux. Being disposed on the other side of the first transparent substrate 1, the transparent film layer 12 does not affect the arrangement of the first light-shielding layer 2. Different areas of the gradient zone have different transparency levels. Specifically, the gradient zone corresponding to the brighter portions of the original projected pattern has lower transparency and a greater reduction in light transmission, while the gradient zone corresponding to the brighter portions of the original projected pattern has higher transparency and a smaller reduction in light transmission. This ensures uniform brightness and a natural transition across the entire projected image. The projection of the first light-transmitting zone 3 and the gradient zone can either partially overlap, with the gradient zone only reducing the brightness of a portion of the film pattern, or completely overlap, with the gradient zone reducing the brightness of the entire film pattern, resulting in a more natural transition. In this embodiment, the projection of the first light-transmitting area 3 along the thickness direction of the film completely overlaps with the projection of the second dot density gradient area 10 along the thickness direction of the film. In this embodiment, the gradient area gradually changes the transparency of different areas by controlling the thickness of the film layer, thereby achieving control over the amount of light transmitted.

[0040] The transparent film layer 12 can be located behind the first light-transmitting area 3 , so that the light first passes through the first light-transmitting area 3 and then the light flux is reduced by the transparent film layer 12 ; or it can be located in front of the first light-transmitting area 3 , so that the light first passes through the transparent film layer 12 to reduce the light flux and then passes through the first light-transmitting area 3 . Example 4:

[0041] This embodiment provides a method for preparing a film for a projection lamp in Embodiment 1, comprising a preparation step and a specific pattern making step;

[0042] The preparation steps include: plating chrome on both sides of the first transparent substrate 1, then coating with photosensitive adhesive, and finally baking;

[0043] The specific pattern production steps include: respectively laying out the drawings of the first light-shielding layer 2 and the second light-shielding layer 5, then outputting the master, first exposing and copying the first light-shielding layer 2, then exposing and copying the second light-shielding layer 5, and then performing development, chrome removal, glue removal, drying, cutting and cleaning operations in sequence.

[0044] The preparation steps are applicable to any film part, which can be made and stored first, waiting for subsequent use, saving processing time when it is used later.

[0045] The specific pattern production step is used to produce specific patterns on the film, which requires different pattern layout designs. Example 5:

[0046] A projection lamp provided in this embodiment, as shown in Figure 4, includes a light source 13, an illumination lens group 14, the film for the projection lamp described in any one of Examples 1-3, and an imaging lens group 15 in sequence along the optical axis. The projection lamp can form a projection pattern corresponding to the film pattern on a preset projected surface. The projection pattern includes a near light end and a far light end. The light flux control unit can reduce the luminous flux of a preset area in the film pattern so that the closer the corresponding projection pattern is to the near light end, the greater the reduction in illumination.

[0047] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A film for a projection lamp, characterized in that: The invention comprises a first transparent substrate (1) and a light flux control unit, wherein a first light shielding layer (2) is provided on the first transparent substrate (1), and the first light shielding layer (2) is used to be arranged on the image plane of the projection lamp; the first light shielding layer (2) comprises a first light-transmitting area (3) and a first shielding area (4); light forms a film pattern after passing through the film element; and the light flux control unit is used to reduce the light flux of a preset area in the film pattern.

2. The film for a projection lamp according to claim 1, wherein: The light transmission control unit is a second light shielding layer (5), which is arranged on a side of the first transparent substrate (1) opposite to the first light shielding layer (2); the second light shielding layer (5) includes a first dot matrix density gradient change area (6); the projection of the first light transmission area (3) along the thickness direction of the film overlaps with the projection of the first dot matrix density gradient change area (6) along the thickness direction of the film.

3. The film for a projection lamp according to claim 2, wherein: The second light-shielding layer (5) further comprises a second shielding area (7); the area of the first shielding area (4) projected along the thickness direction of the film is larger than the area of the second shielding area (7) projected along the thickness direction of the film, and the projection of the first shielding area (4) along the thickness direction of the film completely covers the projection of the second shielding area (7) along the thickness direction of the film.

4. The film for a projection lamp according to claim 1, wherein: The light transmission control unit comprises a second transparent substrate (8) close to the first transparent substrate (1), and a third light shielding layer (9) is provided on the second transparent substrate (8); the third light shielding layer (9) comprises a second dot matrix density gradient change area (10); and the projection of the first light transmission area (3) along the thickness direction of the film overlaps with the projection of the second dot matrix density gradient change area (10) along the thickness direction of the film.

5. The film for a projection lamp according to claim 4, wherein: The distance between the first light-shielding layer (2) and the third light-shielding layer (9) is in the range of 0.2 mm to 0.7 mm.

6. The film for a projection lamp according to claim 4, wherein: The third light-shielding layer (9) further includes a third shielding area (11); the area of the first shielding area (4) projected along the thickness direction of the film is larger than the area of the third shielding area (11) projected along the thickness direction of the film, and the projection of the first shielding area (4) along the thickness direction of the film completely covers the projection of the third shielding area (11) along the thickness direction of the film.

7. The film for a projection lamp according to claim 1, wherein: The light transmission control unit adopts a transparent film layer (12), which is arranged on a side of the first transparent substrate (1) opposite to the first light shielding layer (2); the transparent film layer (12) includes a gradient zone with a gradual change in transparency, and the projection of the first light transmission zone (3) along the thickness direction of the film overlaps with the projection of the gradient zone along the thickness direction of the film.

8. A method for preparing a film for a projection lamp according to any one of claims 2 to 3, characterized in that: Includes preparation steps and specific pattern making steps; The preparation steps include: plating chrome on both sides of the first transparent substrate (1), then coating with photosensitive adhesive, and finally baking; The specific pattern production steps include: respectively performing drawing layout on the first light-shielding layer (2) and the second light-shielding layer (5), then outputting a master, firstly exposing and copying the first light-shielding layer (2), then exposing and copying the second light-shielding layer (5), and then sequentially performing development, chrome removal, glue removal, drying, cutting and cleaning operations.

9. A projection lamp, characterized in that: The invention comprises a light source (13), an illumination lens group (14), a film for a projection lamp according to any one of claims 1 to 7, and an imaging lens group (15) in sequence along the optical axis. The projection lamp can form a projection pattern corresponding to the film pattern on a preset projected surface. The projection pattern includes a near lamp end and a far lamp end. The light flux control unit can reduce the light flux of a preset area in the film pattern so that the closer the corresponding projection pattern is to the near lamp end, the greater the reduction in illuminance.

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