CN202008573U

CN202008573U - laser projection optics with double compound eye lens

Info

Publication number: CN202008573U
Application number: CN 201120090694
Authority: CN
Inventors: 刘治新; 吴中雄
Original assignee: SHANGHAI SANXIN TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: SHANGHAI SANXIN TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2011-03-31
Filing date: 2011-03-31
Publication date: 2011-10-12
Anticipated expiration: 2021-03-31

Abstract

The utility model provides a laser projection optics with double compound eye lens, comprising a light sources and color combination module, a compound eye lens for light source extension, a vibration folding mirror, a collimation module, a double compound eye lens for spot correction and energy uniformity, a converging module, and a modulation imaging and projection module. In the projection system using compound eye lens for spot correction and energy uniformization, in order to weaken the grid texture produced by the compound eye lens and speckle produced from coherent interference on a projection screen, and reduce light loss as much as possible during the above process, the compound eye lens for light source expansion and the vibration folding mirror are further added between the collimation module and light sources, thus weakening the grid texture and coherent speckle produced during laser diffraction.

Description

Adopt the laser projection optical system of two fly's-eye lenses

Technical field

The utility model relates to field of projection display, relates in particular to a kind of laser projection optical system that adopts two fly's-eye lenses.

Background technology

LASER Light Source is by the beam shaping shaping and be expanded into area source, can produce the interference imaging point of arbitrariness, is called " speckle ".Adopt the optical system of LASER Light Source to have light efficiency height, advantage that colour gamut is wide, also exist the problem of laser speckle simultaneously.Speckle shows as a kind of interference line, is the recurrent regularly phenomenon of height of brightness.Simultaneously also in picture, form the grid texture in the system of shaping and light uniformization easily using fly's-eye lens to do.In the optical system of traditional use LASER Light Source, generally in light path, can use a light pipe or fly's-eye lens core optical element as spot shaping and uniformity of energy, in addition, in light path, also can increase diffusion sheet (Difuser) and be used to weaken speckle, these diffusion sheets are the fixed installation mode, or adopt vibrations or rotation mode.

But,, need to adopt the diffusion sheet that certain spread angle is arranged in order better to eliminate the grid texture that speckle and light beam form after by fly's-eye lens.But the common transmitance of diffusion sheet is lower, can cause the light efficiency losses of optical system excessive.

Summary of the invention

The utility model purpose is to provide a kind of laser projection optical system that adopts two fly's-eye lenses, use the utility model and can effectively improve laser speckle and the grid texture phenomenon that occurs in the projected picture, the transmitance of fly's-eye lens itself is higher simultaneously can be with light loss control within the acceptable range.

Adopt the laser projection optical system of two fly's-eye lenses, comprise light source and close the look module, be used for first fly's-eye lens, oscillating mirror, collimating module, spot shaping and the uniformity of energy of light source expansion second fly's-eye lens, convergence module, be modulated into picture and projection module.From light source and close the look module emitting laser light beam by behind first fly's-eye lens, it is more even relatively to be extended to energy distribution, the light beam that the cross section is bigger, light beam enters collimating module after reflecting by oscillating mirror afterwards, light beam passes through second fly's-eye lens again behind collimation, after throwed by projection module behind plus lens and the adjustment imaging device.Have at least one to be LASER Light Source in the described light source.

The laser projection optical system of the two fly's-eye lenses of the employing that the utility model provides increases by first fly's-eye lens between collimating module and oscillating mirror, light beam increases through the spread angle of light beam behind this fly's-eye lens, and the energy uniformity of light beam improves.Increase by second fly's-eye lens between collimating module and convergence module, light beam is realized spot shaping and inhomogeneity raising by this fly's-eye lens.

In the laser projection system provided by the utility model, adopt two fly's-eye lenses, two fly's-eye lenses all are to be rearranged by a plurality of lenslet bodies, and the parameter of two fly's-eye lenses can be identical also can be different.

In the laser projection system provided by the utility model, the catoptron of a vibration is arranged before collimating module, the direction of vibration of catoptron is identical with the normal of reflecting surface.Light beam light beam after first fly's-eye lens outgoing has obtained expanding bundle, and energy uniformity improves, light path through oscillating mirror reflection back light beam can change with the vibration of oscillating mirror again, thereby the coherence who effectively destroys laser reaches the purpose that weakens speckle.And light beam can effectively improve the grid texture phenomenon that causes owing to second fly's-eye lens in the angle of divergence increase through light beam behind first fly's-eye lens.

Description of drawings

The laser projection optical system configuration composition of the two fly's-eye lenses of the employing that Fig. 1 the utility model provides;

In Fig. 2 the utility model with the variation synoptic diagram of the vibration light beam light path of oscillating mirror;

In Fig. 3 the utility model light beam through first fly's-eye lens after the angle of divergence of light beam enlarge synoptic diagram.

Specific embodiments

Below in conjunction with each accompanying drawing the content that the utility model proposes is described in detail.The laser projection optical system configuration composition of the two fly's-eye lenses of the employing that Fig. 1 provides for the utility model.

Specific embodiments of the present utility model is: in the light path of LASER Light Source is arranged, by each light source and close the light beam that look module (101) forms, after making light beam obtain expanding bundle and homogenising by first fly's-eye lens (102) earlier, reflection is collimated light by collimating module (104) again through oscillating mirror (103), light beam behind the collimation arrives second fly's-eye lens (105) again, shines the light beam of convergence module (106) after converging and project screen via being modulated into picture and projection module (107) again after light beam is carried out shaping and homogenising.

By oscillating mirror light beam is reflected again behind the spread angle by first fly's-eye lens (102) increase light beam in the solution that the utility model provides, because the direction of mirrors vibrate is the normal direction of reflecting surface, then the light path of light beam after reflection is with the vibration of catoptron change (as shown in accompanying drawing 2), thereby effectively destroy the coherence of laser, weaken the speckle phenomena of projected picture.

Light beam is by first fly's-eye lens (102) the back angle of divergence and the long-pending increase (as shown in accompanying drawing 3) of beam cross section, can reduce effectively because the grid texture problem that light beam occurs owing to diffraction during by second fly's-eye lens (105).

More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. adopt the laser projection optical system of two fly's-eye lenses, this system comprises light source and closes the look module, the fly's-eye lens that is used for the light source expansion, oscillating mirror, collimating module, the fly's-eye lens of spot shaping and uniformity of energy, convergence module, be modulated into picture and projection module, it is characterized in that described from light source and close the look module emitting laser light beam by the diffusion of first fly's-eye lens after, after the oscillating mirror reflection, enter collimating module, light beam by second fly's-eye lens, is throwed by projection module through plus lens and after adjusting imaging device behind collimating module.

2. the laser projection optical system of the two fly's-eye lenses of employing according to claim 1 is characterized in that described light source has at least one to be LASER Light Source.

3. the laser projection optical system of the two fly's-eye lenses of employing according to claim 1, it is characterized in that having in the described optical system two fly's-eye lenses and two fly's-eye lenses can be identical also can be different.

4. according to the laser projection optical system of the two fly's-eye lenses of claim 1 or 3 described employings, it is characterized in that front at described collimating module of described two fly's-eye lenses is first fly's-eye lens, another back at described collimating module is second fly's-eye lens.

5. the laser projection optical system of the two fly's-eye lenses of employing according to claim 1 is characterized in that described oscillating mirror is positioned at before the collimating module.

6. adopt the laser projection optical system of two fly's-eye lenses according to claim 1 or 5, the direction of vibration that it is characterized in that described oscillating mirror is the normal direction of reflecting surface.