CN114690522A

CN114690522A - Optical projection lamp

Info

Publication number: CN114690522A
Application number: CN202011638911.9A
Authority: CN
Inventors: 占爽
Original assignee: Suzhou Jingfang Photoelectric Technology Co ltd
Current assignee: Suzhou Jingfang Photoelectric Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-07-01

Abstract

The invention relates to an optical projection lamp, which is provided with a plurality of optical systems, wherein each optical system respectively comprises a light source, a collimating mirror and a micro-lens array which are sequentially arranged from front to back along a light path, the micro-lens array is provided with a plurality of light channels with display patterns, and images formed by the plurality of light channels in each optical system are overlapped. The invention adopts a plurality of optical systems, and the optical axes of the optical systems are arranged in a set angle, so that the images of the optical systems can be mutually overlapped or complemented, thereby enlarging the whole projection area or improving the brightness of the projection.

Description

Optical projection lamp

Technical Field

The invention belongs to the technical field of optical projection, and particularly relates to a projection lamp applying a micro-lens array technology.

Background

A Micro Lens Array (MLA) is an array type multi-lens structure with a multi-channel structure produced by a semiconductor manufacturing technology, can be applied to the fields of projectors, greeting projection lamps, warning illumination/projection and the like, and can integrate images into a Micro optical lens to generate clear images with gorgeous colors.

Referring to fig. 1, the conventional advertisement or greeting projection lamp generally uses an optical projection principle, and uses a high-brightness light source to project the pattern content on the film to the ground or other planes through an optical system composed of plastic or glass lenses, so as to form an image display and advertisement effect with rich visual impact. But the disadvantages of complex structure, large equipment volume, limited projection area and the like.

Disclosure of Invention

In order to solve the above technical problems, it is an object of the present invention to provide an optical projection lamp different from the existing structure.

In order to achieve the purpose of the invention, the invention adopts the following technical scheme: an optical projection lamp is composed of multiple optical systems including light source, collimator lens, and micro lens array with multiple optical channels with display pattern, and multiple optical channels in each optical system.

In one embodiment of the invention, the images formed by a plurality of said optical systems coincide or partially coincide with each other.

In another embodiment of the present invention, the images formed by the plurality of optical systems do not coincide with each other.

In another embodiment of the present invention, each of the light channels includes a transparent substrate, a patterned layer disposed on a front side of the transparent substrate, a first lens disposed on a front side of the patterned layer, and a second lens disposed on a rear side of the transparent substrate.

In another embodiment of the present invention, the first lens, the transparent substrate, the pattern forming layer, and the second lens are integrally formed.

In another embodiment of the present invention, the pattern forming layer includes a mask and a plurality of light holes formed on the mask.

In another embodiment of the present invention, the light source is one of an LED light source, a halogen lamp, an ultra-high pressure mercury lamp, a xenon lamp, and an incandescent lamp.

The invention adopts a plurality of optical systems, and the optical axes of the optical systems are arranged in a set angle, so that the images of the optical systems can be mutually overlapped or complemented, thereby enlarging the whole projection area or improving the brightness of the projection. Each optical system collimates light emitted by the LED light source into parallel light through a collimating lens, and then forms different patterns on an image surface medium through a micro lens array and a pattern light shield integrated in the micro lens array. By complementarily mounting a plurality of MLAs (micro lens arrays) in angle or distance, the projection pattern is larger in brightness, more uniform and larger in width.

Compared with the prior art, the invention has the advantages of simple and compact structure, large image plane projection area and uniform and clear pattern.

Drawings

FIG. 1 is a schematic diagram of a conventional projection lamp;

FIG. 2 is a schematic view of an optical system of the projection lamp of the present invention;

FIG. 3 is a schematic diagram of an optical path structure of the optical system;

FIG. 4 is a front view of a microlens array;

FIG. 5 is a bottom view of a microlens array;

wherein: 10. a light source; 11. a converging lens; 12. a color wheel; 13. trimming the lens; 14. a digital micro-mirror; 15. a DLP circuit; 16. a projection lens; 17. a projection screen; 2. a light source; 21. a collimating mirror; 22. a microlens array; 23. a first lens; 24. a pattern forming layer; 25. a transparent substrate; 26. a second lens; 100. a first optical system; 200. a second optical system; 300. a third optical system; 400. and (5) projecting.

Detailed Description

For the purpose of illustrating the technical content, the constructional features, the achieved objects and the effects of the invention in detail, reference will be made to the following detailed description of the embodiments in conjunction with the accompanying drawings.

This patent is directed to protecting an optical projection lamp having a housing and a plurality of optical systems disposed within the housing. In the embodiment shown in fig. 2 and 3, a projection lamp comprising 3 optical systems is shown. Each optical system comprises a light source 2, a collimating mirror 21 and a micro-lens array 22 which are sequentially arranged from front to back along a light path, the micro-lens array 22 is provided with a plurality of light channels with display patterns, and images formed by the plurality of light channels are approximately superposed.

In one embodiment of the present invention, the optical axes of the plurality of optical systems form a specific angle, so that the images of the optical systems on the target plane are overlapped, partially overlapped or not overlapped. When the images of the optical systems coincide with each other, a superimposed, brightness-enhanced projection 400 can be formed on the target plane; when the images of the optical systems are not overlapped, the projection area can be enlarged on the target plane, and the purpose of expanding the width or the length of the projection 400 is achieved; when the imaging parts of the optical systems are overlapped, a projection 400 with a difference in brightness can be formed (the overlapped part is bright, and the non-overlapped part is dark), or the images of a plurality of optical systems can be spliced with each other to form a projection 400 of a complete pattern.

In another embodiment of the present invention, it is also possible to realize mutual coincidence, partial coincidence or non-coincidence of images of the optical systems on the target plane by making the optical systems have a certain distance therebetween. Or a plurality of optical systems can be arranged according to a certain angle and distance, so that the pattern areas covered by the optical systems are superposed and complemented, thereby achieving the function of widening the pattern width on the image surface.

Fig. 3 is a schematic structural diagram of an optical system of the projection lamp, and it can be seen that the optical system of the projection lamp is composed of a light source 2, a collimator lens 21, and a microlens array 22. The light source 2, the collimator lens 21, and the microlens array 22 are arranged in this order from front to back along the optical path. The micro lens array 22 has a plurality of light channels with display patterns, and image surface focuses of the plurality of light channels coincide.

The light source 2 is one of an LED light source, a halogen lamp, an ultra-high pressure mercury lamp, a xenon lamp and an incandescent lamp. The light emitted from the light source 2 is collimated into parallel light by the collimator lens 21, and then passes through the microlens array 22 and the pattern forming layer 24 integrated inside the microlens array 22, thereby forming different patterns on the image plane medium. Because the image plane focuses of the optical channels are overlapped, light beams passing through the micro lens array can be superposed on an image plane medium, and therefore display definition and brightness are improved.

Referring to fig. 4 and 5, in one embodiment, each of the light channels includes a transparent substrate 25, a patterned layer 24 disposed on a front side of the transparent substrate 25, a first lens 23 disposed on a front side of the patterned layer 24, and a second lens 26 disposed on a rear side of the transparent substrate 25. Optionally, the transparent substrate 25 is a flat mirror structure as a support, and the material may be made of glass or polymer material. The first lens and the second lens are used for finishing the function of beam shaping and are made of high polymer materials; the pattern forming layer 24 serves as an input pattern, controlling the pattern on the final image plane.

In another embodiment of the present invention, the first lens 23, the transparent substrate 25, the pattern forming layer 24, and the second lens 26 are integrally formed by wafer level lens manufacturing technology. The first lens 23 and the second lens 26 are respectively molded on the transparent substrate 25 by using a polymer material.

In this embodiment, the pattern forming layer 24 includes a mask and a plurality of light holes 27 formed on the mask, and the light holes 27 form pattern content, and when light passes through the microlens array, the light is projected on the focal plane with the same pattern content as the light holes 27.

The micro-lens array is introduced into the projection lamp to replace the original pattern film and the original plastic lens, so that the light source is more hidden, and the projection distance is increased. Meanwhile, a plurality of optical systems are adopted for projection, so that the plurality of optical systems are installed according to a certain angle and distance, a plurality of superposed or complementary projection patterns can be obtained, and the function of widening the pattern width on the image surface is achieved. Since the pattern partial area is formed by superimposing the projection patterns of the plurality of optical systems, the brightness/illuminance of each area on the surface pattern can be controlled by controlling the size of the light transmission hole of the pattern forming layer on each microlens array or by adjusting the illuminance of the light source of each optical system.

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 merely illustrative of the principles of the invention, but various changes and modifications may be made without departing from the spirit and scope of the invention, the scope of which is defined by the appended claims, the description and the equivalents thereof.

Claims

1. An optical projection lamp, characterized by: the display device is provided with a plurality of optical systems, each optical system comprises a light source (2), a collimating mirror (21) and a micro-lens array (22) which are sequentially arranged from front to back along a light path, the micro-lens array (22) is provided with a plurality of light channels with display patterns, and images formed by the plurality of light channels in each optical system are overlapped.

2. An optical projection lamp as claimed in claim 1, characterized in that: images formed by a plurality of the optical systems are overlapped or partially overlapped with each other.

3. An optical projection lamp as claimed in claim 1, characterized in that: images formed by the optical systems do not coincide with each other.

4. An optical projection lamp as claimed in claim 1, characterized in that: each light channel comprises a transparent substrate (25), a pattern forming layer (24) arranged on the front side of the transparent substrate (25), a first lens (23) positioned on the front side of the pattern forming layer (24) and a second lens (26) arranged on the rear side of the transparent substrate (25).

5. An optical projection lamp as claimed in claim 4, characterized in that: the first lens (23), the transparent substrate (25), the pattern forming layer (24) and the second lens (26) are integrally formed.

6. An optical projection lamp as claimed in claim 1, characterized in that: the pattern forming layer (24) comprises a photomask and a plurality of light holes (27) arranged on the photomask.

7. An optical projection lamp as claimed in claim 1, characterized in that: the light source (2) is one of an LED light source, a halogen lamp, an ultrahigh pressure mercury lamp, a xenon lamp and an incandescent lamp.