Micro-lens projection lens assembly

Abstract

The utility model discloses a micro-lens projection lens assembly, and belongs to the technical field of optical projection. Aiming at the problems of low assembly efficiency, low optical utilization rate and limited installation direction of the micro-lens projection lens assembly in the prior art, the micro-lens array and the collimating lens are installed in the internal cavity structure of the installation support, and then the micro-lens array is fixed in the installation support through the installation front cover, so that the micro-lens projection lens assembly can be installed in the micro-lens projection lens assembly. The mounting front cover, the micro-lens array, the mounting bracket and the collimating lens are assembled into the stable micro-lens projection lens assembly in advance and then participate in the assembly of the whole lamp, so that the assembly efficiency and stability are effectively improved; the multi-angle installation direction can be met by using the micro-lens array of the square structure, and meanwhile, the bottom end of the collimating lens is arranged to be a curved surface, so that the collimation degree and the optical utilization rate of the collimating lens are remarkably improved under the condition of the same light source, imaging is clearer, and high practicability and application universality are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical projection, and more specifically, to a microlens projection lens assembly. Background Art

[0002] A microlens array (MLA) is an array composed of lenses with a micron-level clear aperture and relief depth. It not only has the basic functions of traditional lenses such as focusing and imaging, but also has the characteristics of small unit size and high integration, enabling it to complete functions that traditional optical elements cannot, and can form many new optical systems, and is widely used in multiple fields such as projectors, welcome projection lights, warning lighting / projection, etc. The microlens array can integrate an image into a micro-optical lens to generate a clear and colorful image.

[0003] The imaging part of the existing microlens array (MLA) module is generally composed of parts such as a collimating lens, an MLA, and an MLA mounting bracket, and generally participates in the assembly of the whole lamp as loose parts, with low stability and assembly efficiency; at the same time, the conventional collimating lens adopts a plano-convex collimating design scheme, and the collimation degree of the light is ±6°, and the optical utilization rate is about 70%, and the system efficiency is not high; in addition, the existing MLA design generally adopts a rectangular design, and can only meet the installation in two directions, namely 0° and 180° relative to the module direction, which limits the use scenarios and assembly environments of the whole lamp. Summary of the Utility Model

[0004] 1. Technical Problems to be Solved

[0005] The purpose of the utility model is to provide a microlens projection lens assembly to solve the problems of low assembly efficiency, low optical utilization rate, and limited installation directions of the microlens projection lens assembly proposed in the above background art.

[0006] 2. Technical Solutions

[0007] The purpose of the utility model is achieved through the following technical solutions.

[0008] A microlens projection lens assembly includes a front mounting cover, a microlens array, a mounting bracket, and a collimating lens;

[0009] The mounting bracket is composed of a bracket housing, the bracket housing is an internal cavity structure, and a cross-shaped bracket is provided in the internal cavity structure; the microlens array is located on one side of the cross-shaped bracket, and the collimating lens is located on the other side of the cross-shaped bracket; the front mounting cover is connected to one end of the mounting bracket for fixing the microlens array.

[0010] Furthermore, the microlens array is a rectangular structure; the rectangular structure is a square structure.

[0011] Further, the collimating lens includes a plurality of spherical surfaces and a curved surface covering the bottoms of the plurality of spherical surfaces.

[0012] Further, one end of the cross-shaped bracket is provided with light-shielding ribs, and the light-shielding ribs are spaced apart from the plurality of spherical surfaces.

[0013] Further, the bracket housing is of a rectangular structure, a bracket card slot is provided at the vertex of one end of the bracket housing, a bracket buckle is provided at one end of the collimating lens, and the bracket buckle is installed in the bracket card slot for fixing the mounting bracket and the collimating lens.

[0014] Further, mounting bracket positioning ribs are oppositely arranged on two sides of one end of the bracket housing, and fixing holes are oppositely arranged on the other two sides of one end of the mounting bracket.

[0015] Further, a first positioning groove and a second positioning groove are oppositely arranged on two sides of the other end of the bracket housing; the mounting front cover includes a front cover bracket which is of a rectangular structure, and a first positioning rib and a second positioning rib are oppositely arranged on two sides of one end of the front cover bracket; the first positioning rib and the second positioning rib are respectively fixedly installed in the first positioning groove and the second positioning groove.

[0016] Further, a first front cover card slot and a second front cover card slot are oppositely arranged on the other two sides of the other end of the bracket housing; a first front cover buckle and a second front cover buckle are oppositely arranged on the other two sides of one end of the front cover bracket; the first front cover buckle and the second front cover buckle are respectively fixedly connected with the first front cover card slot and the second front cover card slot.

[0017] Further, a collimating positioning rib is connected to one end of the bracket buckle of the collimating lens.

[0018] 3. Advantageous effects

[0019] Compared with the prior art, the advantages of the present utility model are as follows:

[0020] (1) For a microlens projection lens assembly provided by the present utility model, the microlens array and the collimating lens are installed in the cavity structure of the mounting bracket, and then the microlens array is fixed in the mounting bracket through the mounting front cover. Thus, after the mounting front cover, the microlens array, the mounting bracket and the collimating lens are pre-assembled into a stable microlens projection lens assembly and then participate in the assembly of the whole lamp, the assembly efficiency and stability can be effectively improved.

[0021] (2) The micro-lens projection lens assembly provided by the present utility model has the bottom end of the collimating lens set as a curved surface, so that under the same light source conditions, the optical path design can be optimized, the collimation degree and optical utilization rate of the collimating lens can be improved, the imaging can be made clearer, and the design method is simple, easy to process and manufacture, and has strong practicability and wide applicability.

[0022] (3) The micro-lens projection lens assembly provided by the present utility model adopts a micro-lens array with a square structure. Relative to the horizontal direction of the micro-lens projection lens assembly, it can meet multi-angle installation directions, enabling the entire lamp to be applicable to a wider range of installation environments and usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the front view of the lens assembly in the embodiment of the present utility model;

[0024] Figure 2 It is the right view of the lens assembly in the embodiment of the present utility model;

[0025] Figure 3 It is the rear view of the lens assembly in the embodiment of the present utility model;

[0026] Figure 4 It is the exploded view of the lens assembly in the embodiment of the present utility model;

[0027] Figure 5 It is the sectional view of the lens assembly in the embodiment of the present utility model Figure 1 ;

[0028] Figure 6 It is the sectional view of the lens assembly in the embodiment of the present utility model Figure 2 ;

[0029] Figure 7 It is the sectional view of the lens assembly in the embodiment of the present utility model Figure 3 ;

[0030] Figure 8 It is the front view of the installation of the lens assembly and the PCB circuit board in the embodiment of the present utility model;

[0031] Figure 9 It is the rear view of the installation of the lens assembly and the PCB circuit board in the embodiment of the present utility model;

[0032] Figure 10 It is the schematic diagram of the projection method in the embodiment of the present utility model.

[0033] Explanation of the reference numerals in the figures: 1. Installation front cover; 101. Front cover bracket; 102. First positioning rib; 103. Second positioning rib; 104. First front cover buckle; 105. Second front cover buckle;

[0034] 2. Micro-lens array;

[0035] 3. Mounting bracket; 301. Bracket housing; 302. Cross-shaped bracket; 303. First positioning groove; 304. Second positioning groove; 305. First front cover card slot; 306. Second front cover card slot; 307. Mounting guide; 308. Mounting bracket positioning rib; 309. Fixing hole; 310. Bracket card slot; 311. Light shielding rib;

[0036] 4. Collimating lens; 401. Spherical surface; 402. Collimating support rib; 403. Collimating lens buckle; 404. Bracket buckle; 405. Curved surface; 406. Collimating positioning rib;

[0037] 5. PCB circuit board; 501. First mounting bracket positioning hole; 502. Second mounting bracket positioning hole; 503. First positioning hole; 504. Second positioning hole; 505. First collimating positioning hole; 506. Second collimating positioning hole;

[0038] 6. LED lamp. Specific embodiments

[0039] The following combines the specification drawings and specific embodiments to describe the present utility model in detail.

[0040] Embodiment

[0041] As Figures 1 - 4 shown, a microlens projection lens assembly provided in this embodiment includes a mounting front cover 1, a microlens array 2, a mounting bracket 3, and a collimating lens 4.

[0042] Specifically in this embodiment, as Figure 4 shown, the mounting front cover 1 includes a front cover bracket 101, and the front cover bracket 101 is a rectangular structure. In this embodiment, more preferably, the front cover bracket 101 is a square structure. On both sides of one end of the front cover bracket 101, a first positioning rib 102 and a second positioning rib 103 are oppositely arranged, and on the other two sides of one end of the front cover bracket 101, a first front cover buckle 104 and a second front cover buckle 105 are oppositely arranged.

[0043] In this embodiment, the microlens array 2 is a rectangular structure. More preferably, the microlens array 2 is set as a square structure. Thus, by setting the microlens array 2 as a square structure, relative to the horizontal direction of the microlens projection lens assembly, the square-structured microlens array 2 can be rotatably mounted, meeting the multi-angle mounting directions, including any assembly in four directions of 0°, 90°, 180°, and 270°, making the assembly of the microlens projection lens assembly into the vehicle more flexible, not restricted by the installation space, and thus applicable to a wider range of installation environments and usage scenarios.

[0044] The mounting bracket 3 is composed of a bracket housing 301. In this embodiment, the mounting bracket 3 has a rectangular structure. The bracket housing 301 is provided with an internal cavity structure, and a cross-shaped bracket 302 is installed in the internal cavity structure. The cross-shaped bracket 302 has a structure like a Chinese character 'tian' in the horizontal plane direction of the internal cavity structure. Further, the microlens array 2 is located on one side of the cross-shaped bracket 302, and the collimating lens 4 is located on the other side of the cross-shaped bracket 302.

[0045] In this embodiment, the mounting front cover 1 is connected to one end of the mounting bracket 3 for fixing the microlens array 2. Specifically, a first positioning groove 303 and a second positioning groove 304 are oppositely arranged on both sides of one end of the bracket housing 301, and a first front cover clamping groove 305 and a second front cover clamping groove 306 are provided on the other two sides of one end of the bracket housing 301. Further, the first positioning rib 102 and the second positioning rib 103 of the mounting front cover 1 are respectively fixedly installed in the first positioning groove 303 and the second positioning groove 304. At the same time, through the mounting guides 307 provided at both ends of the bracket housing 301, the first front cover buckle 104 and the second front cover buckle 105 of the mounting front cover 1 are respectively fixedly connected to the first front cover clamping groove 305 and the second front cover clamping groove 306. Thus, by connecting the mounting front cover 1 to the mounting bracket 3, the position of the microlens array 2 is ensured to be fixed.

[0046] It should be noted that a bracket clamping groove 310 is provided at the vertex of the other end of the bracket housing 301. In this embodiment, a bracket clamping groove 310 is provided at each of the four vertices of the other end of the bracket housing 301. Two mounting bracket positioning ribs 308 are oppositely arranged on both sides of one end of the bracket housing 301, and two fixing holes 309 are oppositely arranged on the other two sides of one end of the bracket housing 301.

[0047] In this embodiment, the collimating lens 4 includes a plurality of spherical surfaces 401 and a curved surface 405 covering the bottom ends of the plurality of spherical surfaces 401. It is worth noting that in this embodiment, the bottom end of the collimating lens 4 is provided with a free-form surface structure.

[0048] It should be noted that in the prior art, the large-angle light source emitted by the LED lamp 6 cannot be effectively converted into parallel light, while the curved surface 405 at the bottom end of the collimating lens 4 can convert the large-angle light source emitted by the LED lamp 6 into parallel light, achieving the maximum energy utilization rate.

[0049] Specifically, in this embodiment, the light source emitted by the LED lamp 6 is generally a Lambertian light source. The Lambertian light source is converged by the curved surface 405 at the bottom end of the collimating lens 4 to improve the energy utilization rate. The free-form surface structure can accurately control the incident or exit angle of light. Further, through the quadratic B-spline curve equation, it can be calculated that the angular distribution range of parallel light can be reduced from ±6° to ±3° through the curved surface 405 at the bottom end of the collimating lens 4. The specific calculation formula is:

[0050]

[0051] Among them, t represents a parameter with a value range of 0 to 1, and P(t) represents a quadratic curve to be optimized, which is composed of m small segments of curves. P m-1 (t) represents the m-th small segment of curve on P(t), and b m-1 , b m , b m+1 all represent three control points on P m-1 (t).

[0052] Thus, through the free-form surface structure at the bottom end of the collimating lens 4, the optical path design can be optimized under the same light source conditions, reducing the collimation degree of the collimating lens 4 from ±6° to ±3°, improving the collimation degree and optical utilization rate of the collimating lens 4, making the imaging clearer, and the design method is simple, easy to process and manufacture, with strong practicability and wide applicability.

[0053] Furthermore, in this embodiment, the collimating lens 4 is composed of four spherical surfaces 401, and the four spherical surfaces 401 are respectively located within the cross-shaped bracket 302 of the mounting bracket 3. As Figure 5 shown, a light-shielding rib 311 is further provided at one end of the cross-shaped bracket 302. The light-shielding rib 311 is used to space apart the four spherical surfaces 401 to prevent the parallel light emitted between the four spherical surfaces 401 from interfering with each other. A bracket buckle 404 is provided at one end of the collimating lens 4. In this embodiment, four bracket buckles 404 are provided at one end of the collimating lens 4. Thus, the four bracket buckles 404 are respectively installed in the four bracket slots 310 of the bracket housing 301, so as to fix the mounting bracket 3 and the collimating lens 4. In this embodiment, collimating lens buckles 403 are further provided at both ends of the collimating lens 4 to further fix the mounting bracket 3 and the collimating lens 4. It should be noted that in this embodiment, two collimating support ribs 402 and two collimating positioning ribs 406 are respectively connected to one end of the four bracket buckles 404 of the collimating lens 4. The two collimating support ribs 402 are located on the diagonal of the collimating lens 4, and the two collimating positioning ribs 406 are located on the other diagonal of the collimating lens 4.

[0054] Thus, for a micro-lens projection lens assembly provided in this embodiment, the micro-lens array 2 and the collimating lens 4 are installed in the cavity structure of the mounting bracket 3, and then the micro-lens array 2 is fixed in the mounting bracket 3 through the mounting front cover 1. Thus, after the mounting front cover 1, the micro-lens array 2, the mounting bracket 3, and the collimating lens 4 are pre-assembled into a stable integrated micro-lens projection lens assembly and then participate in the assembly of the entire lamp, the assembly efficiency and stability can be effectively improved.

[0055] This embodiment also provides a projection method for a microlens projection lens assembly, including the following steps: constructing the described microlens projection lens assembly; further, fixing and installing the microlens projection lens assembly in the positioning holes of the PCB board 5 through the mounting bracket positioning ribs 308, fixing holes 309 and collimating positioning ribs 406. Specifically, as Figure 6 and Figure 9 shown, install the two mounting bracket positioning ribs 308 of the mounting bracket 3 in the first mounting bracket positioning hole 501 and the second mounting bracket positioning hole 502 of the PCB board 5 respectively; as Figure 8 and Figure 9 shown, install the two fixing holes 309 of the mounting bracket 3 in the first positioning hole 503 and the second positioning hole 504 of the PCB board 5 respectively; as Figure 7 and Figure 9 shown, install the two collimating positioning ribs 406 of the collimating lens 4 in the first collimating positioning hole 505 and the second collimating positioning hole 506 of the PCB board 5 respectively. Thus, pre-assemble the front mounting cover 1, microlens array 2, mounting bracket 3 and collimating lens 4 into a stable microlens projection lens assembly, which is integrally formed; in this embodiment, as Figure 5 shown, one end of the two collimating support ribs 402 is connected to the PCB board 5, and is further used to support the collimating lens 4; further, as Figure 7 shown, an LED lamp 6 is provided on one side of the PCB board 5, and the LED lamp 6, collimating lens 4 and microlens array 2 are arranged in sequence from front to back along the optical path; the PCB board 5 is connected to a power supply, and the LED lamp 6 emits light; further, as Figure 10 shown, the light source emitted by the LED lamp 6 is beam-shaped through the collimating lens 4 to form parallel light, and the parallel light forms a projection pattern through the microlens array 2. In this embodiment, the microlens array 2 is composed of a plurality of microlenses, and a specific pattern, that is, a channel, is etched by a lithography process at the mask position corresponding to each microlens. The parallel light passes through a plurality of channels and converges and combines on the target surface to form a pre-designed projection pattern.

[0056] The above has schematically described the present utility model creation and its implementation manners. This description is not restrictive. Without departing from the spirit or basic features of the present utility model, the present utility model can be implemented in other specific forms. What is shown in the accompanying drawings is only one of the implementation manners of the present utility model creation, and the actual structure is not limited thereto. Any reference signs in the claims should not limit the claims involved. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of this creation, design structurally similar ways and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present utility model. In addition, the term "comprising" does not exclude other elements or steps, and the term "a" before an element does not exclude including "a plurality of" such elements. The multiple elements stated in the product claims can also be implemented by one element through software or hardware. Words such as first and second are used to indicate names and do not indicate any specific order.

Claims

1. A microlens projection lens assembly, characterized in that, It includes a mounting front cover (1), a microlens array (2), a mounting bracket (3), and a collimating lens (4); The mounting bracket (3) is composed of a bracket housing (301). The bracket housing (301) has an internal cavity structure, and a cross-shaped bracket (302) is provided in the internal cavity structure. The microlens array (2) is located on one side of the cross-shaped bracket (302), and the collimating lens (4) is located on the other side of the cross-shaped bracket (302). The mounting front cover (1) is connected to one end of the mounting bracket (3) for fixing the microlens array (2).

2. The microlens projection lens assembly according to claim 1, wherein, The microlens array (2) has a rectangular structure; the rectangular structure is a square structure.

3. A microlens projection lens assembly according to claim 1, characterized in that, The collimating lens (4) includes a plurality of spherical surfaces (401) and a curved surface (405) covering the bottom ends of the plurality of spherical surfaces (401).

4. A microlens projection lens assembly according to claim 3, characterized in that, One end of the cross-shaped bracket (302) is provided with a light-shielding rib (311), and the light-shielding rib (311) is spaced from a plurality of spherical surfaces (401).

5. A microlens projection lens assembly according to claim 4, characterized in that, The bracket housing (301) has a rectangular structure. A bracket card slot (310) is provided at the vertex of one end of the bracket housing (301). One end of the collimating lens (4) is provided with a bracket buckle (404), and the bracket buckle (404) is installed in the bracket card slot (310) for fixing the mounting bracket (3) and the collimating lens (4).

6. The microlens projection lens assembly according to claim 5, wherein On both sides of one end of the bracket housing (301), mounting bracket positioning ribs (308) are provided oppositely. On the other two sides of one end of the mounting bracket (3), fixing holes (309) are provided oppositely.

7. The microlens projection lens assembly according to claim 6, characterized in that, On both sides of the other end of the bracket housing (301), a first positioning slot (303) and a second positioning slot (304) are provided oppositely. The mounting front cover (1) includes a front cover bracket (101). The front cover bracket (101) has a rectangular structure. On both sides of one end of the front cover bracket (101), a first positioning rib (102) and a second positioning rib (103) are provided oppositely. The first positioning rib (102) and the second positioning rib (103) are respectively fixedly installed in the first positioning slot (303) and the second positioning slot (304).

8. The microlens projection lens assembly according to claim 7, characterized in that, On the other two sides of the other end of the bracket housing (301), a first front cover card slot (305) and a second front cover card slot (306) are provided oppositely. On the other two sides of one end of the front cover bracket (101), a first front cover buckle (104) and a second front cover buckle (105) are provided oppositely. The first front cover buckle (104) and the second front cover buckle (105) are respectively fixedly connected to the first front cover card slot (305) and the second front cover card slot (306).

9. The microlens projection lens assembly according to claim 5, wherein, One end of the bracket buckle (404) of the collimating lens (4) is connected with a collimating positioning rib (406).

Images