CN216248739U

CN216248739U - Reflective prism-free illumination system for micro projection

Info

Publication number: CN216248739U
Application number: CN202122795765.7U
Authority: CN
Inventors: 林丰; 邹思源; 魏威; 董俊; 贺银波
Original assignee: Shenzhen Eviewtek Technology Co ltd
Current assignee: Shenzhen Eviewtek Technology Co ltd
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2022-04-08
Anticipated expiration: 2031-11-16

Abstract

The utility model discloses a reflective prism-free illumination system for micro projection, which comprises an integrated laser light source, a reflector, a DMD chip and an imaging lens, wherein the imaging lens and the DMD chip are arranged on the same vertical plane, and the DMD chip is arranged below the imaging lens; the laser light source is arranged on one side of the DMD chip, and light beams emitted by the laser light source are reflected to the effective reflecting surface of the DMD chip through the reflectors and finally perpendicularly shot into the imaging lens. The utility model provides a reflective no prism lighting system for miniature projection, no prism design eliminate the negative effects of beam splitting prism to the system completely, adopt the design of free-form surface reflector, further reduce system's reflector quantity, can not only guarantee each item optical index of projecting apparatus, can also reduce the number of times of light through the optical surface.

Description

Reflective prism-free illumination system for micro projection

Technical Field

The utility model relates to the technical field of miniature projectors, in particular to a reflective prism-free illumination system for miniature projection.

Background

The micro projector comprises a bottom layer made of technologies in the crossing field of optical, mechanical and electrical engineering and the like; the final imaging effect of the projection is closely related to the illumination system of the micro projector besides the imaging lens. The design composition of the illumination system directly affects the parameters of the whole projector such as imaging quality, output efficiency, uniformity and the like. The prior micro projector illumination system mainly comprises a plurality of lenses, a light homogenizing element and a light splitting prism, and finally projects a picture through the light splitting prism and an imaging lens, wherein the main transmission mode of a light path in the system is projection and refraction.

The existing micro projection system mainly comprises a plurality of lenses, a light homogenizing element (fly-eye lens or square bar) and a prism. A lens has two optical surfaces, and if one optical surface has a light attenuation coefficient of x, one lens has a loss of x2 to the system light. If the system light passes through n lenses, x2n loss will be caused. In addition, the prism of the partial mirror placed in front of the DMD can cause multiple reflection and transmission of light, and the prism of the partial mirror has material properties with higher refractive index, so that more efficiency loss is inevitably caused, and the back focal length of the imaging lens is influenced.

The utility model mainly solves the defects and provides a reflective prism-free lighting system for micro projection.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention aims to provide a reflective prism-free illumination system for micro-projection, in which a sheet of reflector has only one optical surface, and the prism-free design completely eliminates the negative effect of the beam splitter prism on the system. By adopting the design of the free-form surface reflector, the number of system reflectors can be further reduced, various optical indexes of the projector can be ensured, and the times of light rays passing through the optical surface can be reduced.

In order to achieve the purpose, the utility model provides the following technical scheme: a reflective non-prism lighting system for micro projection comprises an integrated laser light source, a reflector, a DMD chip and an imaging lens, wherein the imaging lens and the DMD chip are arranged on the same vertical plane, and the DMD chip is arranged below the imaging lens; the laser light source is arranged on one side of the DMD chip, and light beams emitted by the laser light source are reflected to the effective reflecting surface of the DMD chip through the reflectors and finally perpendicularly shot into the imaging lens.

Preferably, in the above-mentioned reflective prism-free illumination system for micro-projection, the reflector is designed as a free-form surface reflector, and one reflector has only one optical surface.

Preferably, in the above-mentioned reflective prism-free illumination system for micro projection, the reflectors are arranged in a manner including a combination of three reflectors or a combination of two reflectors.

According to the technical scheme, compared with the prior art, the high-efficiency uniform illumination system for 3D printing is simple in composition structure, the number of lenses in a projector is reduced, a beam splitting prism is omitted, efficiency loss caused by the lenses and the prism is reduced, and uniformity of picture brightness is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic diagram of a three-reflector structure according to the present invention.

FIG. 2 is a schematic diagram of the uniformity of the DMD chip of FIG. 1 at the active surface.

Fig. 3 is a schematic diagram of a two-reflector structure according to the present invention.

FIG. 4 is a schematic diagram of the uniformity of the DMD chip of FIG. 3 at the active surface.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, a reflective prism-free illumination system for micro projection according to the present invention includes an integrated laser source 1, a reflector 2, a DMD chip 3 and an imaging lens 4, wherein the imaging lens 4 and the DMD chip 3 are disposed on a same vertical plane, and the DMD chip 3 is disposed under the imaging lens 4; the laser light source 1 is arranged on one side of the DMD chip 3, light beams emitted by the laser light source 1 are reflected to an effective reflecting surface of the DMD chip 3 through the reflectors 2, and finally the light beams vertically enter the imaging lens 4.

Preferably, in the above-mentioned reflective prism-free illumination system for micro-projection, the reflector 2 is designed as a free-form surface reflector, and one reflector has only one optical surface.

Preferably, in the above-mentioned reflective prism-free illumination system for micro projection, the reflector 2 is disposed in a manner including three reflector combinations or two reflector combinations.

The embodiment of the application shows the form of two reflectors and the form of three reflectors respectively, and the principle is that the control of light rays is realized by using a reflection mode, so that the control of the size, the angle and the energy distribution of light beams emitted by a light source is completed; in addition, according to the embodiment of the application, the reflector 2 replaces a lens and a beam splitter prism, the composition of the illumination system is completed, the shape and the uniformity of light spots at the DMD chip 3 are ensured, the uniformity (the minimum value and the maximum value) is about 85%, the incident angle of light is highly matched with the deflection angle of the DMD chip, the light path does not need to be changed by the beam splitter prism, and the light directly enters the imaging system after being reflected by the DMD chip 3.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reflective prism-free illumination system for miniature projection, comprising: the lighting system comprises an integrated laser light source, a reflector, a DMD chip and an imaging lens, wherein the imaging lens and the DMD chip are arranged on the same vertical plane, and the DMD chip is arranged below the imaging lens; the laser light source is arranged on one side of the DMD chip, and light beams emitted by the laser light source are reflected to the effective reflecting surface of the DMD chip through the reflectors and finally perpendicularly shot into the imaging lens.

2. A reflective prism-free illumination system for micro-projection as claimed in claim 1, wherein the reflector is a free-form reflector design and one reflector has only one optical surface.

3. A reflective prism-free illumination system for micro-projection as claimed in claim 1, wherein the reflectors are arranged in a manner comprising three or two reflector combinations.