CN209486454U

CN209486454U - The optical engine system of DLP projector

Info

Publication number: CN209486454U
Application number: CN201822033693.0U
Authority: CN
Inventors: 田海军; 何龙
Original assignee: Sichuan Changhong Electric Co Ltd
Current assignee: Sichuan Changhong Electric Co Ltd
Priority date: 2018-12-05
Filing date: 2018-12-05
Publication date: 2019-10-11
Anticipated expiration: 2028-12-05

Abstract

The utility model relates to field of projector, disclose a kind of optical engine system of DLP projector, can not efficiently separate to solve the problems, such as in existing laser television imaging ray with non-imaged light.The utility model successively includes light source, colour wheel, optical wand, relay optical system, reflecting mirror, TIR prism, dmd chip and projection lens, the relay optical system successively includes the first optical element and the second optical element, and the non-effective optical region on the TIR prism light-emitting surface is designed with the first light-absorption layer for absorbing stray light.The utility model is suitable for DLP projector.

Description

The optical engine system of DLP projector

Technical field

The utility model relates to field of projector, in particular to a kind of optical engine system of DLP projector.

Background technique

The imaging of DLP laser television is the light engine therein by realizing at multiple small lens reflecting light System Working Principle is as shown in Figure 1, the light that light source 1 generates is divided into red-green-blue light by colour wheel 2, by optical wand 3 by light The light uniformization in source 1 simultaneously carries out beam pattern conversion, then will be uniform by relay optical system 4, reflecting mirror 5 and TIR prism 6 Illumination after change is mapped on dmd chip 7, and imaging ray (ON state light) is reflected into projection by the modulation of dmd chip 7 Camera lens 8, then projected on screen by projection lens 8, rather than imaging ray (OFF state light) then passes through the tune of dmd chip 7 System is reflected into except camera lens.

ON state light and OFF state light are existed simultaneously in TIR prism light-emitting face based on the characteristic of DLP shadow casting technique Line transmission.Since DLP projector optical engine system is complicated, there are many optical element quantity in lighting system, therefore generate spuious Light is more.These stray lights finally transmit out also by TIR prism light-emitting face, will partially enter camera lens.In summary divide Analysis, TIR prism light-emitting surface exist simultaneously ON state light, OFF state light and spurious rays transmission.

Existing system structure does not modulate OFF state light specially, if system structure slightly deviation, OFF light also can There is fraction to enter camera lens, influences image quality.Processing of the prior art to stray light simultaneously, it is predominantly at one or seldom several Additional mechanism of diaphragm part at a optical element, since the design and assembling process of mechanism of diaphragm part are complicated, and partial optical element Between since gap is too small can not add mechanism of diaphragm part, therefore the stray light that can not be generated to all optical elements all have Effect processing, can only choose key position and be handled.Optical component before TIR, the stray light of generation, finally by TIR rib Mirror light-emitting face transmits out, finally can collect with except ON state and OFF state transmission path, therefore be emitted smooth surface in TIR, if It sets diaphragm and carries out the veiling glare processing that disappears, effect is best.Meanwhile OFF light is modulated on this face, it is maximally efficient.Because OFF light is Non-imaged light carries out absorption processing to such optics, but thus bring direct result is exactly to lead to TIR in the usual way Temperature is sharply increased, and influences the reliability of TIR and the heat dissipation performance of whole system.

Utility model content

Technical problem to be solved by the utility model is: a kind of optical engine system of DLP projector is provided, to solve The problem of imaging ray and non-imaged light can not efficiently separate in existing laser television.

To solve the above problems, the technical solution adopted in the utility model is: the optical engine system of DLP projector, according to Secondary includes light source, colour wheel, optical wand, relay optical system, reflecting mirror, TIR prism, dmd chip and projection lens, the relaying light System successively includes the first optical element and the second optical element, the non-effective optical region on the TIR prism light-emitting surface It is designed with the first light-absorption layer for absorbing stray light.

In order to be further reduced stray light, the lower edges face of first optical element, which is additionally provided with, absorbs stray light Second light-absorption layer.

Further, first light-absorption layer is arranged by way of printing or being coated with.

Further, the light source is laser, LED or light bulb.

The beneficial effects of the utility model are: the light that light source issues, can be in light after optical wand is modulated in the utility model Learn element lower edges face generate stray light, can also generate stray light in the non-effective optical region of TIR prism, by Light-absorption layer is arranged in the output optical zone TIR domain, and by spuious light absorption, can effectively avoid stray light and enter influences imaging clearly in projection lens Degree；Meanwhile exporting OFF state light, even if system has small deviations, OFF state light can be absorbed by light-absorption layer, will not Into camera lens, image quality is not influenced, and temperature rise will not be caused to increase since TIR absorbs OFF state light guide.The utility model is not required to Increase other structures part, easy to implement, structure is simple, and will not influence the projection of imaging ray, is conducive to improve imaging clearly Clear degree.Meanwhile absorbed layer only absorbs stray light and fraction OFF state light, can effectively reduce system temperature rise.

Detailed description of the invention

Fig. 1 is that the light of DLP projector in the prior art propagates schematic diagram；

Fig. 2 is the spuious light propagation schematic diagram of DLP projector in the prior art；

Fig. 3 is the spuious light propagation schematic diagram at TIR prism in the prior art；

Fig. 4 is utility model diagram；

Fig. 5 is that the stray light of relay optical system in the utility model is absorbed schematic diagram；

Fig. 6 is that the stray light in the utility model at TIR prism is absorbed schematic diagram；

Fig. 7 is the schematic diagram of light-absorption layer on TIR prism light-emitting surface；

In the figure, it is marked as 1- light source, 2- colour wheel, 3- optical wand, 4- relay optical system, 41- optical element, 5- reflecting mirror, 6-TIR prism, 61-TIR prism light-emitting surface, 7-DMD chip, 8- projection lens, the first light-absorption layer of 91-, 92 are the second light-absorption layer.

Specific embodiment

The utility model is further detailed with reference to the accompanying drawing for the ease of understanding the utility model,.

Fig. 1 to Fig. 3 is the optical engine system of DLP projector in the prior art, can be with the generation generation of stray light by figure At optical element 41 and at TIR prism 6.As shown in Fig. 2, the lower edges face of optical element 41 can be generated as caused by reflecting Stray light, stray light can be with normal imaging light forward projects, after reaching on dmd chip 7, and stray light becomes non-imaged Light, this part non-imaged light intersect on TIR prism light-emitting surface 61 with imaging ray, can not be in TIR prism light-emitting surface 61 Upper progress effective district point, the two enters together participates in imaging in projection lens 8；As shown in figure 3, what is generated at TIR prism 6 is spuious After light leaves TIR prism 6, thrown wholly or largely entering after the refraction of TIR prism light-emitting surface 61 as non-imaged light In shadow camera lens 8；Above-mentioned stray light can all seriously affect the clarity that last gained is imaged.

As shown in figure 4, a kind of optical engine system of DLP projector disclosed by the utility model, successively include light source 1, Colour wheel 2, optical wand 3, relay optical system 4, reflecting mirror 5, TIR prism 6, dmd chip 7 and projection lens 8, the relay optical system System 4 successively includes the first optical element 41 and the second optical element 42, and the lower edges face of optical element 41 is equipped with the second extinction Layer 92, the non-effective optical region on the light-emitting surface 61 of TIR prism 6 are equipped with the first light-absorption layer 91.As shown in figure 5, optical wand 3 generates Stray light when projecting the lower edges face of optical element 41, the second light-absorption layer 92 can be directly by spuious light absorption, stray light Will not then it enter in subsequent optical system, it, will not be right since the second light-absorption layer 92 is located at the edge surface of optical element 41 Imaging ray has any impact；As shown in fig. 6, TIR prism 6 generate stray light be go out by TIR prism it is non-on pass face 61 Effective optical region is refracted into projection lens 8, therefore the non-effective optical region setting on TIR prism light-emitting surface 61 First light-absorption layer 91, stray light are directly absorbed by the first light-absorption layer 91, and ON state imaging ray then passes through not set first extinction Effective optical region of layer 91 enters in projection lens 8,

Based on DLP shadow casting technique characteristic, after DMD reflects, there can be OFF state light, ideally, OFF shape State light can be reflected into except camera lens, but can because of small structural system deviation, part OFF light possibly into camera lens, therefore It needs to carry out absorption processing by the first light-absorption layer 91.Normal OFF state light, the effective coverage through not set light-absorption layer, no Into camera lens, shines directly on optical engine system front cover, absorbed by front cover.

As shown in fig. 7, the first light-absorption layer 91 is one layer of black light-absorbing film, consolidated by the ink layer for printing or being coated with It is fixed, do not increase additional knot component, greatlys save cost, simplified overall structure yet.

Claims

The optical engine system of 1.DLP projector successively includes light source (1), colour wheel (2), optical wand (3), relay optical system (4), reflecting mirror (5), TIR prism (6), dmd chip (7) and projection lens (8), the relay optical system (4) successively include First optical element (41) and the second optical element (42), which is characterized in that non-effective on the TIR prism light-emitting surface (61) Optical region is designed with the first light-absorption layer (91), the first light-absorption layer (91) be used for absorb TIR prism generation stray light and partially To the OFF light of projection lens (8).
2. the optical engine system of DLP projector as described in claim 1, which is characterized in that first optical element (41) lower edges face is provided with the second light-absorption layer (92) for absorbing stray light.
3. the optical engine system of DLP projector as described in claim 1, which is characterized in that first light-absorption layer (91) It is arranged by way of printing or being coated with.
4. the optical engine system of DLP projector as described in claim 1, which is characterized in that the light source (1) be laser, LED or light bulb.