CN215416251U

CN215416251U - Projection optical machine and projector

Info

Publication number: CN215416251U
Application number: CN202121410485.3U
Authority: CN
Inventors: 朱青; 孙峰; 程炎
Original assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Current assignee: Shenzhen Anhua Photoelectric Technology Co ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-01-04
Anticipated expiration: 2031-06-23

Abstract

The utility model relates to a projection optical machine and a projector, wherein the projection optical machine comprises a shell, a lens module, a DMD module, a light beam adjusting module and a light source module, wherein the lens module, the DMD module, the light beam adjusting module and the light source module are positioned in the shell; the projection optical machine also comprises a light blocking piece, wherein the light blocking piece comprises a fixing part, a blocking part and a shading part; the shading part and the shading part are inserted between the lens component and the prism component, and the shading part is used for shading the lighting stray light; the fixed part is respectively and fixedly connected with the shell and the shading part and is vertical to the shading part; the shielding part is fixedly connected with the shading part and forms a first angle with the shading part, and is used for shielding the deflection light beam. The projection optical machine has simple and compact structure, can shield illumination stray light and polarized light beams, reduces the heat dissipation pressure of the DMD, and effectively ensures the working reliability of the optical machine.

Description

Projection optical machine and projector

Technical Field

The utility model relates to the technical field of projection, in particular to a projection optical machine and a projector.

Background

Digital Light Processing (DLP) projection display approaches are in line with the current demand for miniaturization of projection devices. The DLP projector collimates light emitted by a light source through a collimation light path, the light is expected to enter a fly-eye lens in a parallel mode as far as possible and then is emitted, then the light is focused by a converging lens behind the fly-eye lens to obtain an even central illumination light spot reaching Digital Micromirror Devices (DMDs), the DMD reflects the incident light, when the DMD is in an ON state, the DMD reflects the incident light to form a positive light beam, and the positive light beam reaches a lens module along a preset route and then is emitted to finish projection work.

Because the light source component adopted by the DLP projector is a surface light source rather than a point light source, and a collimating light path cannot be in a completely ideal state, light rays entering the fly-eye lens are difficult to be collimated into parallel light rays or light rays with a small divergence angle, large-angle light rays always enter the fly-eye lens, after the large-angle incident light rays are emitted through the fly-eye lens and the converging lens positioned behind the fly-eye lens, the track of the large-angle incident light rays can obviously deviate from the small-angle incident light rays, and special stray light of the fly-eye lens is formed.

Furthermore, when some of the micromirrors in the DMD are in the OFF state, the illumination light rays irradiated on these OFF state micromirrors are reflected in a direction at an angle to the positive light beam, and these light rays are called polarized light beams, which have high energy and, if not limited, can cause thermal damage to other components of the optical engine, so that it is necessary to take appropriate measures to solve this problem.

In the prior art, the shielding of the side lobe light and the shielding of the polarized light beam are respectively processed, such as shielding the side lobe light by a light shielding member, absorbing the polarized light beam by a matting varnish coated on a prism, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model provides a projection optical machine and a projector, which have simple and compact structures, can shield sidelobe light and polarized light beams, reduce the heat dissipation pressure of a DMD, effectively improve the working reliability of the DMD and prolong the service life of the DMD.

The technical scheme adopted by the utility model is as follows:

in a first aspect, the present invention provides a projection optical machine, which includes a housing, and a lens module, a DMD module, a light beam adjusting module and a light source module located inside the housing, where the light beam adjusting module includes a prism assembly, a fly-eye lens and a lens assembly located between the prism assembly and the fly-eye lens, and light emitted from the light source module passes through the fly-eye lens, the lens assembly and the prism assembly and enters the DMD module;

the projection optical machine further comprises a light blocking piece, wherein the light blocking piece comprises a fixing part, a blocking part and a shading part; the light shielding part and the shielding part are inserted between the lens component and the prism component, and the light shielding part is used for shielding side lobe light; the fixed part is respectively and fixedly connected with the shell and the shading part and is vertical to the shading part; the shielding part is fixedly connected with the shading part and forms a first angle with the shading part, and the shielding part is used for shielding the deflection light beam.

Optionally, the shading part comprises a first shading subsection, a second shading subsection, a third shading subsection and a fourth shading subsection which are sequentially connected end to end, and a middle through hole formed after the first shading subsection, the second shading subsection, the third shading subsection and the fourth shading subsection are connected can penetrate through a preset effective light to enter the prism assembly.

Optionally, the first shade subsection includes a portion proximate to the shade portion, and the retainer portion is connected to the portion proximate to the shade portion.

Optionally, the shielding portion is quadrilateral, the shielding portion is connected to the second side of the shading portion through the first side, the first side of the shielding portion and the second side of the shading portion are overlapped at an end point far away from the fixing portion, and the length of the first side of the shielding portion is smaller than that of the second side of the shading portion.

Optionally, the lens assembly includes a first relay lens, a support column is provided in the housing, the support column is used for positioning the first relay lens, an accommodating groove is formed between the support column and the prism assembly, the blocking portion is located in the accommodating groove, and the end of the support column close to the blocking portion is a plane parallel to the blocking portion.

Optionally, the support column is provided with a threaded hole, the casing comprises a cover plate, the cover plate is provided with a first via hole, the fixing part is provided with a second via hole, the connecting bolt passes through the first via hole, the second via hole and the threaded hole to fix the fixing part on the casing, and at least one part of the fixing part is attached to the casing.

Optionally, the housing includes a sidewall, a first slot is disposed on the sidewall, and the light shielding portion is inserted into the first slot.

Optionally, the light blocking member is an integral flat plate bending structure, the fixing portion is bent by 90 degrees relative to the light blocking portion, and the shielding portion is bent to form an angle relative to the light blocking portion.

In a second aspect, the utility model further provides a projector including the light engine as described above. According to the projection optical machine, the light blocking part is arranged between the lens component and the prism component, the through hole in the center of the light blocking part is used for allowing preset effective light to pass, and the side lobe light is difficult to pass due to the shielding of the light blocking part and can enter the prism component due to the difficulty of side lobe light, so that the side lobe light is difficult to exit to a DMD through the prism component; the shielding part of the light shielding piece shields the emergent light path of the bias light beam, so that OFF light is shielded by the light shielding piece and cannot irradiate other parts of the optical machine to cause heat damage; the heat dissipation pressure caused by the side lobe light borne by the DMD is avoided, and the reliability of the DMD and other parts is guaranteed; the integrated miniaturized projection optical machine structure is further realized, and the side lobe light and the polarized light beam are simultaneously shielded by adopting the light blocking component with a simplified and compact structure.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art will understand the technical features and technical solutions presented in the description.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

FIG. 1 is a schematic perspective view of a preferred embodiment of a projection light machine according to the present invention;

FIG. 2 is an exploded view of a preferred embodiment of a projection light engine provided in accordance with the present invention;

FIG. 3 is a schematic cross-sectional view of a preferred embodiment of a projection light machine according to the present invention;

FIG. 4 is a schematic structural view of a preferred embodiment of a flag provided by the present invention;

fig. 5 is a schematic perspective view of a preferred embodiment of the light projector without a light blocking member according to the present invention.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the nature of the present invention, well-known methods, procedures, and components have not been described in detail.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1 to 5, the present invention provides a projection optical engine, including a housing, and a lens module 100, a DMD module 200, a light beam adjusting module 300 and a light source module 400 which are located inside the housing, where the light beam adjusting module 300 includes a prism assembly 310, a fly-eye lens 320 and a lens assembly 330 located between the prism assembly 310 and the fly-eye lens 320, and light emitted from the light source module 400 passes through the fly-eye lens 320, the lens assembly 330 and the prism assembly 310 and enters the DMD module 200;

the optical projection engine further includes a light blocking member 340, where the light blocking member includes a fixing portion 341, a shielding portion 342, and a shielding portion 343; the shielding portion 342 and a light shielding portion 343 are interposed between the lens assembly 330 and the prism assembly 310, the light shielding portion 343 being for shielding side lobe light; the fixing portion 341 is fixedly connected to the housing and the light shielding portion 343, and is perpendicular to the light shielding portion 343; the shielding portion 342 is fixedly connected to the shielding portion 343, and forms a first angle with the shielding portion 343, for shielding the polarized light beam.

When the projection light machine works, R, G, B three-primary-color time sequence light is emitted by the light source module, a collimation light path in the light source module collimates the light emitted by the light source, the collimated light passes through the fly-eye lens and the lens assembly in sequence and then enters the prism assembly to reach Digital micro-mirror Devices (DMDs), the DMDs reflect the incident light, when the DMDs are in an ON state, the DMDs reflect the incident light to form a positive light beam, the positive light beam reaches the lens module along a preset route and then is emitted, and a picture is projected onto a curtain.

According to the projection optical machine provided by the utility model, the light blocking part is arranged between the lens component and the prism component, the through hole in the center of the light blocking part is used for allowing preset effective light to pass, and the sidelobe light is difficult to pass due to the shielding of the light blocking part and can enter the prism component due to the difficulty of the sidelobe light, so that the sidelobe light is difficult to exit to a DMD through the prism component; the shielding part of the light shielding piece shields the emergent light path of the bias light beam, so that OFF light is shielded by the light shielding piece and cannot irradiate other parts of the optical machine to cause heat damage; the heat dissipation pressure caused by the side lobe light borne by the DMD is avoided, and the reliability of the DMD and other parts is guaranteed; the integrated miniaturized projection optical machine structure is further realized, and the side lobe light and the polarized light beam are simultaneously shielded by adopting the light blocking component with a simplified and compact structure.

As will be understood by those skilled in the art, the light blocking member is preferably made of metal or alloy material in order to facilitate the conduction of the heat of the light blocking member to the outside.

Alternatively, referring to fig. 4, the shading portion 343 includes a first shading sub-portion 3431, a second shading sub-portion 3432, a third shading sub-portion 3433 and a fourth shading sub-portion 3434 connected end to end, and a central through hole 3435 formed after the first shading sub-portion 3431, the second shading sub-portion 3432, the third shading sub-portion 3433 and the fourth shading sub-portion 3434 are connected can transmit a predetermined effective light to enter the prism assembly 310.

Considering that light rays incident into the fly-eye lens at a large angle may come from various directions, and side lobe light generated thereby may exist at various angles of the outer ring of the central illumination spot, the light shielding part is set to a form including a first light shielding part, a second light shielding part, a third light shielding part and a fourth light shielding part which are connected end to end in sequence, and a central through hole for transmitting a predetermined effective light ray is left after the first light shielding part, the second light shielding part, the third light shielding part and the fourth light shielding part are connected end to end. As will be understood by those skilled in the art, the effective light rays should mainly be light rays that are incident ON the prism and then exit ON the DMD, and when the DMD is in the ON state, the effective light rays can be reflected by the DMD to become positive light beams and exit along the lens module, thereby completing the projection operation. And a frame body formed by connecting the first shading branch, the second shading branch, the third shading branch and the fourth shading branch end to end can block sidelobe light in the outer ring 360-degree direction of the central lighting spot.

Alternatively, the first shade subsection 3431 includes a portion adjacent to the shield portion 342 to which the fixed portion 341 is connected.

The fixing part is connected with the part, close to the shielding part, of the first light shielding part, so that the occupied space and the material use of the fixing part can be saved while the mutual fixation between the light shielding part and the shell is completed, furthermore, the connecting part of the fixing part and the first light shielding part is close to the shielding part, the structural strength of the light shielding part can be further enhanced, the light shielding part and the shielding part are not prone to deformation, and the light shielding effect of the light shielding part and the shielding part is guaranteed.

Optionally, the shielding portion 342 is a quadrilateral shape, the shielding portion 342 is connected to the second side of the shielding portion 343 through a first side, the first side of the shielding portion 342 and the second side of the shielding portion 343 overlap at an end point far away from the fixing portion 341, and the length of the first side of the shielding portion 341 is smaller than the length of the second side of the shielding portion 342.

The shielding part is set to be quadrilateral, so that the emergent light path of the polarized light beam is shielded as much as possible, and the polarized light beam cannot irradiate other parts which are not high in temperature resistance in the optical machine. The area of the shielding part can fully shield the polarized light beams to realize the function, so that the size of the shielding part is not required to be further increased, the length of the first side edge of the shielding part is smaller than that of the second side edge of the shielding part, the shielding part is not too long, so that the fixing part is interfered, and the normal fixing and assembling between the fixing part and the shell are not facilitated.

Optionally, the lens assembly 330 includes a first relay lens 331, a supporting column 332 is disposed in the housing for positioning the first relay lens 331, a receiving groove 333 is formed between the supporting column 332 and the prism assembly 310, the shielding portion 342 is disposed in the receiving groove 333, and an adjacent end 3331 of the supporting column 332 adjacent to the shielding portion 342 is a plane parallel to the shielding portion 342.

In order to realize the spacing of the shielding part and not introduce more components to cause the inner structure of the optical machine to be complicated or be unfavorable for the small integration of the optical machine, the supporting column for fixing and positioning the first relay lens is utilized as the spacing component of the shielding part, so that the shielding part is positioned between the accommodating grooves formed between the supporting column and the prism assembly, and the unexpected displacement change can not occur. Make the support column close to the end that closes on of occlusion part is the plane parallel with occlusion part, has certain distance between this plane and the occlusion part plane, then can further prevent to take place to interfere between support column and the occlusion part.

Optionally, a threaded hole 3321 is formed in the supporting pillar 332, the housing includes a cover plate 500, a first via hole 510 is formed in the cover plate, a second via hole 3411 is formed in the fixing portion 341, the connecting bolt 350 passes through the first via hole 510, the second via hole 3411 and the threaded hole 3321, the fixing portion 341 is fixed to the housing, and at least a portion of the fixing portion 341 is attached to the housing.

The existing support column for positioning the first relay lens in the optical machine is used as a fixed connecting piece for the light blocking piece and the shell, so that the optical machine is beneficial to the simplification and miniaturization of the structure; through being equipped with the screw hole on the support column, set up the form of the corresponding via hole in position respectively on the apron of casing and the fixed part, can fix the mounting on the casing simply conveniently. Make partly and the casing laminating of fixed part, like this, shielding part and the portion that is in the light can be conducted the casing of ray apparatus through the fixed part owing to the heat that is brought by the light that is sheltered from, and the casing surface area of ray apparatus is great, is favorable to aforementioned heat to be conducted outside air as early as possible fully in, avoids the part that is in the light overheated.

Optionally, the housing includes a sidewall, a first slot 600 is disposed on the sidewall, and the light shielding portion 343 is inserted into the first slot 600.

Utilize the existing lateral wall of ray apparatus casing, set up a first slot, fix a position the shading portion, realize the spacing to the shading portion on the one hand, on the other hand, owing to do not introduce more locating component, be favorable to simplification, the miniaturization of ray apparatus structure. In one embodiment, the fourth light shielding portion of the light shielding portion may be inserted into the first slot, and at this time, as will be understood by those skilled in the art, the portion of the fourth light shielding portion entering the first slot does not shield the side lobe light (the corresponding portion of the side lobe light may be shielded by the outer sidewall of the first slot), and the portion of the fourth light shielding portion exposed outside the first slot continues to shield the side lobe light.

Optionally, the light blocking member is an integral flat plate bending structure, the fixing portion 341 is formed by bending at 90 degrees with respect to the light blocking portion 343, and the shielding portion 342 is formed by bending at a first angle with respect to a corresponding portion of the light blocking portion 343.

The flat plate structure is bent to form the integrated light blocking piece, so that connecting pieces for fixedly connecting the fixing portion 341, the shielding portion 342 and the shielding portion 343 are reduced, the light blocking piece is convenient to manufacture, and the production efficiency is improved.

In a second aspect, the utility model further provides a projector including the light engine as described above.

It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the utility model.

Claims

1. A light projector comprises a shell, a lens module (100), a DMD module (200), a light beam adjusting module (300) and a light source module (400) which are positioned inside the shell, wherein the light beam adjusting module (300) comprises a prism assembly (310), a fly-eye lens (320) and a lens assembly (330) positioned between the prism assembly (310) and the fly-eye lens (320), and light emitted by the light source module (400) is incident to the DMD module (200) through the fly-eye lens (320), the lens assembly (330) and the prism assembly (310); the method is characterized in that:

the projection optical machine further comprises a light blocking member (340), wherein the light blocking member (340) comprises a fixing part (341), a shielding part (342) and a shielding part (343); the light shielding part (343) and a shielding part (342) are inserted between the lens assembly (330) and the prism assembly (310), and the light shielding part (343) is used for shielding side lobe light; the fixed part (341) is fixedly connected with the shell and the light shielding part (343) respectively and is vertical to the light shielding part (343); the shielding part (342) is fixedly connected with the shielding part (343) and forms a first angle with the shielding part (343) for shielding the polarized light beam.

2. The projection optical engine of claim 1, wherein the light shielding part (343) comprises a first light shielding section (3431), a second light shielding section (3432), a third light shielding section (3433) and a fourth light shielding section (3434) connected end to end, and the first light shielding section (3431), the second light shielding section (3432), the third light shielding section (3433) and the fourth light shielding section (3434) are connected to form a central through hole which is capable of transmitting a predetermined effective light to enter the prism assembly (310).

3. The light engine of claim 2, wherein the first shade subsection (3431) includes a portion adjacent to the shade portion (342), and the fixed portion (341) is connected to the portion adjacent to the shade portion.

4. The optical projection engine according to claim 1, wherein the shielding portion (342) is quadrilateral, the shielding portion (342) is connected to the second side of the light shielding portion (343) through a first side, the first side of the shielding portion (342) and the second side of the light shielding portion (343) are overlapped at an end point far away from the fixing portion (341), and the length of the first side of the shielding portion (342) is smaller than that of the second side of the light shielding portion (343).

5. The light engine of claim 1, wherein the lens assembly (330) comprises a first relay lens (331), a supporting column (332) for positioning the first relay lens (331) is disposed in the housing, a receiving groove (333) is formed between the supporting column (332) and the prism assembly (310), the shielding portion (342) is located in the receiving groove (333), and an adjacent end of the supporting column (332) adjacent to the shielding portion (342) is a plane parallel to the shielding portion (342).

6. The optical projection engine according to claim 5, wherein the supporting post (332) has a threaded hole (3321), the housing comprises a cover plate (500), the cover plate has a first through hole (510), the fixing portion (241) has a second through hole (3411), a connecting bolt (350) fixes the fixing portion (341) on the housing through the first through hole (510), the second through hole (3411) and the threaded hole (3321), and at least a portion of the fixing portion (341) is attached to the housing.

7. The light engine of claim 1, wherein the housing comprises a sidewall, the sidewall is provided with a first slot (600), and the light shielding portion (343) is inserted into the first slot (600).

8. The light engine according to any of the claims 1 to 7, wherein the light barrier is a one-piece flat plate bending structure, the fixing portion (341) is bent 90 degrees relative to the light blocking portion (343), and the blocking portion (342) is bent at an angle relative to the light blocking portion (343).

9. A projector comprising the light engine of any of claims 1-8.