CN213210527U

CN213210527U - Large-projection-range composite micro-lens array and projection system

Info

Publication number: CN213210527U
Application number: CN202022563117.4U
Authority: CN
Inventors: 张海升
Original assignee: Suzhou Jingfang Photoelectric Technology Co ltd
Current assignee: Suzhou Jingfang Photoelectric Technology Co ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-05-14
Anticipated expiration: 2030-11-09

Abstract

The utility model relates to a compound microlens array of big scope of throwing, including a plurality of optical channel units that closely arrange with the array mode, each optical channel unit all contains the condensing lens, the pattern formation layer that sets gradually along the optical axis direction, transparent basement and throws lens, and transparent basement is the plano-convex lens, and condensing lens is aspheric lens or free-form surface lens with throwing lens, and condensing lens and throwing lens are plano-convex lens. The utility model discloses an introduce special aspheric surface, free-form surface lens design and expand the angle of projection of current microlens array camera lens to more than 40 degrees from the 20 degrees projection light cone angle of market mainstream, satisfy the demand of bigger projection scope; different from the tradition, the micro-lens array lens can be arranged on an automobile chassis to project a pattern to a road surface at a large glancing angle, and the damage to the pattern projection effect caused by closing of an automobile door can be avoided.

Description

Large-projection-range composite micro-lens array and projection system

Technical Field

The utility model belongs to the optical lighting field, in particular to micro lens array and projection system.

Background

The projection system is an optical system that images an object illuminated on a projection screen. The short-distance projection system can be applied to the side face of an automobile for welcoming, can also be applied to the front and the rear of the automobile for warning and reminding, and can also be applied to desktop projection, such as projection of keyboard images. For example, CN208871411U, the existing usher lamp usually needs to be installed on the rear-view mirror and the front door handle of the car to project a clear enough pattern on the ground, because the existing microlens array lens in the market is a spherical lens, and the maximum light cone angle is about 20 degrees, the projection range of the road pattern is limited, and the projection area must be increased by increasing the projection distance. In addition, the traditional welcome lamp is arranged at the positions of a rearview mirror or a handle and the like, and the projection effect can be influenced when the door of the automobile is opened or closed. Finally, the area projected by the existing microlens arrays is limited, and the consumer demand for larger projected images is rapidly growing, and how to increase the projected area while maintaining the existing advantages of the microlens arrays is a pain point in the market.

Disclosure of Invention

In order to solve the technical problem, the utility model aims at solving the problem of the undersize of the array projection area of the existing microlens, and obtaining a microlens array with a larger projection range.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: a composite micro-lens array with a large projection range comprises a plurality of light channel units which are closely arranged in an array mode, wherein each light channel unit comprises a condensing lens, a pattern generation layer, a transparent substrate and a projection lens which are sequentially arranged along the direction of an optical axis, the transparent substrate is a flat mirror, the condensing lens and the projection lens are plano-convex lenses, the condensing lens and the projection lens are aspheric lenses or free-form surface lenses, and the thickness of the transparent substrate is T₂The curvature radius of the condensing lens is C₁The radius of curvature of the projection lens is C₂And satisfies 0.1. ltoreq. C₁/T₂≤0.3，-15≤C₂/T₂≤5。

In the above technical solution, it is further preferable that the thickness T of the transparent substrate₂Is 2 mm-4.5 mm.

In the above technical solution, it is further preferable that the abbe number of the transparent substrate is not less than 60.

In the above-described aspect, it is further preferable that abbe numbers of the condenser lens and the projection lens are 50 or more.

In the foregoing technical solution, it is further preferable that the central thickness of the condenser lens is T₁And satisfies 0.05. ltoreq. T₁/T₂ ≤0.5。

In the foregoing technical solution, it is further preferable that the projection lens has a center thickness of T₃And satisfies 0.01. ltoreq. T₃ /T₂≤0.4。

In the above aspect, it is further preferable that the light collecting lens, the pattern generating layer, the transparent substrate, and the projection lens are integrally formed by gluing or thermocompression bonding.

In the above technical solution, it is further preferable that the plurality of light channel units are arranged in a hexagonal array.

The utility model also provides a projection system, it includes light source, collimating lens, the above-mentioned compound microlens array of arranging along the optical axis direction, projection system's light cone angle more than or equal to 40 degrees.

Compared with the prior art, the utility model obtain following beneficial effect: the utility model discloses a microlens array of special design, can project the pattern that designs on the road surface, introduce special aspheric surface, free-form surface lens design and expand the projection angle of current microlens array camera lens to more than 40 degrees from the 20 degrees projection light cone angles of market mainstream, satisfy the demand of bigger projection scope; different from the tradition, the micro-lens array lens can be arranged on an automobile chassis to project a pattern to a road surface at a large glancing angle, and the damage to the pattern projection effect caused by closing of an automobile door can be avoided.

Drawings

Fig. 1 is a schematic diagram of an optical path of the projection system of the present invention;

fig. 2 is a schematic structural diagram of a projection system of the present invention;

fig. 3 is a front view of the composite microlens array of the present invention;

FIG. 4 is a schematic structural diagram of an optical channel unit;

wherein: 1. a light source; 2. a collimating lens; 3. a microlens array; 30. an optical channel unit; 31. a condenser lens; 32. a pattern generation layer; 33. a transparent substrate; 34. a projection lens.

Detailed Description

To explain the technical content, structural features, achieved objects and functions of the present invention in detail, the following detailed description is made with reference to the accompanying drawings. It is to be understood that the embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive of the scope of protection. The following disclosure provides many different embodiments or examples for implementing different structures of the patent, and to simplify the disclosure of the patent, specific example components and arrangements are described below. Further, this patent provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the application of other materials.

The attached figures 1-2 show that the projection system of the utility model can be used for car welcome lamp, desktop projection lamp and the like, and is used for projecting on a target plane P₀Predetermined patterns, such as characters, graphic symbols, patterns, etc., are projected on the base plate. This projection system includes the light source 1 that arranges in proper order along the optical axis direction, collimating lens 2 and compound microlens array 3, wherein, this light source 1 chooses for use the miniature LED of hi-lite, can give out white light or other colour light, what light source 1 sent is divergent light, go out after collimating lens 2 arrangement, through projecting behind the microlens array on ground or desktop, because microlens array's effect, make this projection system have the light cone angle theta of more than or equal to 40 degrees, better effect of dispersing has, can produce bigger projection area on shorter image plane distance. The microlens array 3 is made of an integrated wafer level optical lens (WLO), has a small size, and can be mounted on an object such as an automobile chassis.

As shown in fig. 3 to 4, the composite microlens array is composed of a first microlens array (condensing lens 31 array), a second microlens array (projection lens 34 array), a transparent substrate 33, and a pattern generating layer 32, wherein the pattern generating layer 32 is adhered to one side surface of the transparent substrate 33 by an organic adhesive, the first microlens array is formed on the pattern generating layer 32 by using a semiconductor processing technique, and the second microlens array is formed on the other side surface of the transparent substrate 33 by using a semiconductor processing technique. The first microlens array, the pattern generation layer 32, the transparent substrate 33, and the second microlens array together form a light tunnel unit 30 including a plurality of light tunnel units closely arranged in an array. Generally, the microlens array 3 often includes tens to hundreds of such optical channel units 30, and a plurality of the optical channel units 30 are arranged in a hexagonal array or a rectangular array to increase the efficiency of light energy utilization.

Each of the light tunnel units 30 forms an independent optical imaging tunnel having an optical axis, a condenser lens 31, a pattern formation layer 32, a transparent substrate 33, and a projection lens 34. In each light channel unit 30, light incident through the collimating lens 2 is irradiated on the pattern generating layer 32 through the condensing lens 31, the pattern generating layer 32 is actually a mask, a partially hollowed pattern is engraved on the mask, only a hollowed part is light-transmitting after being irradiated by the light, and the pattern forms a projection on an image plane after passing through the transparent substrate 33 and the projecting lens 34. Each light channel unit 30 independently projects an image onto the road surface, and the images projected by each light channel unit on the road surface are completely the same, so that the projected images of the light channel units on the road surface are superposed, the brightness of the projected patterns can be increased, and simultaneously due to the unique multi-channel characteristic, the projection imaging can be performed under a very large projection angle, so that the projection imaging from the vehicle chassis becomes possible.

In the preferred embodiment of the present disclosure, the transparent substrate 33 is a flat mirror, the condensing lens 31 and the projecting lens 34 are plano-convex lenses, and the condensing lens 31 and the projecting lens 34 are aspheric lenses or free-form lenses. The thickness of the transparent substrate is T₂The radius of curvature of the condenser lens is C₁The radius of curvature of the projection lens is C₂And satisfies 0.1. ltoreq. C₁/T₂≤0.3，-15≤C₂/T₂5, in this example, the thickness T of the transparent substrate₂Is 2 mm-4.5 mm. The central thickness of the condensing lens is T₁And satisfies 0.05. ltoreq. T₁/T₂Less than or equal to 0.5. The center thickness of the projection lens is T₃And satisfies 0.01. ltoreq. T₃ /T₂Less than or equal to 0.4. The abbe number of the transparent substrate is 60 or more. The abbe numbers of the condenser lens and the projection lens are 50 or more.

This patent is based on array multichannel formation of image principle, and the design of microlens array plays crucial effect to formation of image definition, luminance, projection scope, through special design microlens array module, carries out aspheric surface design and free curved surface design with focusing lens and projection lens, rationally matches other sizes simultaneously for the angle of throwing increases to more than 40 degrees, increases the scope of projecting the formation of image on the road surface.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims, specification and equivalents thereof.

Claims

1. The utility model provides a compound microlens array of big projection range, includes a plurality of optical channel units that closely arrange with the array mode, each optical channel unit all contains condensing lens, pattern formation layer, transparent base and the projection lens that sets gradually along the optical axis direction, its characterized in that: the transparent substrate is a flat mirror, the condensing lens and the projecting lens are plano-convex lenses, the condensing lens and the projecting lens are aspheric lenses or free-form surface lenses, and the thickness of the transparent substrate is T₂The curvature radius of the condensing lens is C₁The radius of curvature of the projection lens is C₂And satisfies 0.1. ltoreq. C₁/T₂≤0.3，-15≤C₂/T₂≤5。

2. A large projection range composite microlens array as set forth in claim 1, wherein: the thickness T of the transparent substrate₂Is 2 mm-4.5 mm.

3. A large projection range composite microlens array as set forth in claim 1, wherein: the Abbe coefficient of the transparent substrate is more than or equal to 60.

4. A large projection range composite microlens array as set forth in claim 1, wherein: the abbe coefficients of the condenser lens and the projection lens are more than or equal to 50.

5. A large projection range composite microlens array as set forth in claim 1, wherein: the central thickness of the condensing lens is T₁And satisfies 0.05. ltoreq. T₁/T₂≤0.5。

6. The large projection range composite microlens array of claim 1, wherein: the center thickness of the projection lens is T₃And satisfies 0.01. ltoreq. T₃ /T₂≤0.4。

7. A large projection range composite microlens array as set forth in claim 1, wherein: the condensing lens, the pattern generating layer, the transparent substrate and the projection lens are integrally formed through gluing or thermal compression.

8. A large projection range composite microlens array as set forth in claim 1, wherein: the plurality of light channel units are arranged in a hexagonal array.

9. A projection system, characterized by: it includes light source, collimating lens, composite micro-lens array as claimed in any of claims 1-8, which is arranged along the optical axis direction, and the light cone angle θ of the projection system is greater than or equal to 40 degrees.