CN113917769A

CN113917769A - Projection light machine and projection equipment

Info

Publication number: CN113917769A
Application number: CN202110700628.2A
Authority: CN
Inventors: 朱青; 王源; 孙峰
Original assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Current assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-01-11
Anticipated expiration: 2041-06-23
Also published as: CN113917769B

Abstract

The invention relates to a projection optical machine and projection equipment, wherein an optical machine shell of the projection optical machine comprises a bottom shell, a first cover plate, a second cover plate and a heat dissipation and light blocking assembly, the bottom shell is provided with a light source cavity and a lens group cavity which are connected at the end parts, the side wall of the lens group cavity is externally connected with a main body lens flange, the bottom of the bottom shell is provided with a hollow structure for the heat dissipation and light blocking assembly to pass through, the main body lens flange and a connecting terminal of a light source module extend out of the bottom shell, and the main body lens flange is provided with a mounting groove; the light source cavity extends from the lens group cavity to one side of the main body lens flange; the first cover plate covers the lens cavity, and the second cover plate covers the light source cavity; the galvanometer module is arranged in the mounting groove; the lens module is arranged on the main body lens flange; the light beam adjusting module is arranged in the lens group cavity and comprises a prism assembly, a fly-eye lens and a lens assembly; the light source module is arranged in the light source cavity. The invention can reduce the volume of the projection light machine as much as possible and improve the debugging efficiency.

Description

Projection light machine and projection equipment

Technical Field

The invention relates to the technical field of projection, in particular to a projection optical machine and projection equipment.

Background

The projection device is a device for projecting images or videos onto a curtain or a wall, is widely applied to offices, schools, entertainment places and the like, gradually permeates into the daily life of people, and in order to adapt to the convenience of life, the miniaturized and miniaturized projection device gradually becomes a great important development trend of projection display. Digital Light Processing (DLP) projection display mode has the characteristics of high brightness, high contrast and high resolution, is combined with a novel LED Light source, can realize miniaturized portable miniature projection, and meets the requirements of people on portability and freedom of projection display.

The projection imaging quality of the DLP projection equipment is closely related to the fixing mode of the optical path and the optical components. In DLP projection devices, a three-color (R, G, B) diode (LED) is usually used as a light source, and the light source passes through an optical modulation module, a DMD module (Digital Micro-mirror Device) and a lens module in sequence and is projected onto a target plane. DLP projection equipment belongs to optical precision equipment, when certain link in the light path appears the error, can lead to subsequent light path to propagate the deviation and be enlargeed, perhaps, the light source utilization ratio is reduced, directly influences whole projection system's energy utilization, projection homogeneity, projection quality etc.. Therefore, when the installed projection light machine is tested, all the optical elements inside the projection light machine are often required to be adjusted, in order to pursue the microminiaturization development of the DLP projection equipment, the size of the projection equipment is smaller and smaller, a plurality of parts are required to be disassembled for each adjustment, and the assembly and debugging process is increased; the space area of the whole optical machine shell is too large, so that the probability of dust entering the optical machine shell is increased, and the projection effect is influenced; moreover, due to the compact and tight structure of the projection device, the problem of poor heat dissipation performance and the like can also be caused in the process of size reduction, so that the working reliability of the projection device is reduced, and even the service life of the projection device is shortened.

Disclosure of Invention

Based on the above situation, the main objective of the present invention is to provide a projection optical engine and a projection device, so as to solve the problem of complicated process in debugging the projection optical engine in the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the invention provides a projection optical machine, which comprises an optical machine shell, a lens module, a galvanometer module, a DMD module, a light beam adjusting module and a light source module,

the optical machine shell comprises a bottom shell, a first cover plate, a second cover plate and a heat dissipation and light blocking assembly, wherein the bottom shell is provided with a light source cavity and a lens group cavity which are connected at end parts, a main lens flange is connected to the outside of the side wall of the lens group cavity, a hollow structure is arranged at the bottom part of the bottom shell, the main lens flange extends out of an opening of the lens group cavity, and a mounting groove is arranged at one side of the main lens flange, which is far away from the lens group cavity; the light source cavity extends from the lens group cavity to one side where the main body lens flange is located; the first cover plate covers the lens cavity, and the second cover plate covers the light source cavity;

the galvanometer module is mounted in the mounting groove;

the lens module is arranged on the main body lens flange;

the DMD module is arranged on the outer wall of the lens group cavity far away from the light source cavity;

the light beam adjusting module is arranged in the mirror group cavity and comprises a prism assembly close to the DMD module, a fly-eye lens close to the light source cavity and a lens assembly positioned between the prism assembly and the fly-eye lens;

the light source module is partially arranged in the light source cavity, the light emitting direction of the light source module faces the fly-eye lens, the light source module comprises a plurality of light source assemblies distributed along the circumferential direction of the light source cavity, each light source assembly comprises a connecting terminal, and each connecting terminal extends out of the second cover plate and is distributed on one side of the light source cavity, which is far away from the lens group cavity, and on two sides of the light source cavity, which are opposite to each other along the optical axis direction of the lens module;

the heat dissipation light blocking assembly is installed on the outer side of the bottom shell, and part of the hollow structure extends into the lens group cavity and is located between the main body lens flange and the prism assembly.

Preferably, a notch is formed in the side edge, facing the first cover plate, of the second cover plate, and the projection of the notch is staggered with the projection position of each connecting terminal along the opening direction of the light source cavity;

the first cover plate extends into the gap to extend.

Preferably, first apron is the metal sheet, the second apron is plastic slab or metal sheet, the seam crossing of first apron and second apron has still covered dustproof sticker.

Preferably, a space is left between the connection terminal and the second cover plate.

Preferably, mirror group chamber with the opening in light source chamber is stair structure, first apron with the second apron all install in stair structure's ladder surface.

Preferably, a pressing protrusion protrudes from the inner side of the first cover plate, and the pressing protrusion presses against the prism assembly and the lens assembly.

Preferably, the first cover plate is a metal piece, and the second cover plate is a plastic piece.

Preferably, the optical enclosure further comprises a dustproof sticker covering the seam of the first cover plate and the second cover plate.

Preferably, the heat dissipation light blocking assembly comprises a heat dissipation member and a light blocking member connected to the heat dissipation member, the heat dissipation member comprises a heat dissipation portion with heat dissipation fins and a heat conduction portion connected to the heat dissipation portion, the heat dissipation portion is connected to the outer side of the bottom case, and the heat conduction portion extends between the prism assembly and the main body lens flange;

the light barrier is including installing in the installation department of heat dissipation portion with connect in the shielding part of installation department, the shielding part stretches into the mirror group chamber, and is located the camera lens module with DMD module between the prism subassembly is on the light path when dark state.

Preferably, the inner side wall of the lens group cavity is provided with a mounting structure, and the mounting structure is positioned on one side close to the opening of the bottom shell and is arranged opposite to the hollowed-out structure; the lens assembly includes a first relay lens proximate the prism assembly, the first relay lens being mounted to the mounting structure;

the thermally conductive portion is disposed opposite the mounting structure.

Preferably, the heat conducting part surrounds part of the edge of the prism assembly, and in the direction of the optical axis of the lens module, the heat conducting part and the shielding part at least partially overlap in projection.

The second aspect of the present invention provides a projection device, which includes a main chassis and the optical projector as described in any of the above, where the optical projector is installed in the main chassis.

The projection optical machine comprises a bottom shell, a first cover plate and a second cover plate of the bottom shell, wherein the first cover plate is covered with a lens group cavity of the bottom shell for mounting a light beam adjusting module, the second cover plate is covered with a light source cavity for mounting a light source module, the part of the light source cavity, which protrudes out of the lens group cavity, and the lens module are positioned on the same side of the lens group cavity, and meanwhile, a main body lens flange for mounting the lens module and a connecting terminal of the light source module extend out of the opening side of the bottom shell, so that the structure of the whole projection optical machine is more compact, the space utilization rate is improved, and the miniaturization development trend is favorably adapted; meanwhile, the first cover plate and the second cover plate which are separately arranged are adopted, and the components which are mainly required to be adjusted are the fly-eye lenses when the whole projection optical machine is debugged, so that the first cover plate is only required to be opened, the structures such as a connecting terminal and a main body lens flange can be avoided, and the assembly and debugging process is saved; and only the space area of the light beam adjusting module part needing to be adjusted is exposed through the first cover plate, so that the probability of dust and the like entering the optical case is reduced. On the other hand, the projection optical machine is compact in structure, heat is not easy to conduct, especially heat of light rays emitted by the DMD module in a dark state is serious, the heat dissipation light blocking assembly is additionally arranged at the main body lens flange, the light rays are prevented from entering the lens vibration to damage the lens vibration, and the influence on picture quality when the light rays enter the lens module to form a projection picture can be prevented as far as possible.

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

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:

FIG. 1 is a schematic structural diagram of a preferred embodiment of a projection optical machine provided by the present invention;

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

FIG. 3 is a cross-sectional view of a preferred embodiment of a projection light engine provided in accordance with the present invention;

fig. 4 and 5 are schematic structural diagrams of different viewing angles of a preferred embodiment of a carriage housing of the projection optical apparatus according to the present invention;

FIG. 6 is an exploded view of a preferred embodiment of the carriage housing of the projection light engine of the present invention;

fig. 7 is a schematic structural diagram of a bottom casing of a projection optical engine according to a preferred embodiment of the present invention;

fig. 8 is a schematic structural diagram of a preferred embodiment of a heat dissipation shielding assembly in a projector;

FIG. 9 is an exploded view of a preferred embodiment of a heat sink shield assembly in a projection engine according to the present invention;

fig. 10 is a schematic structural diagram of another preferred embodiment of the projection optical machine provided by the present invention.

In the figure:

10. an optical chassis; 11. a bottom case; 111. a light source cavity; 112. a lens group cavity; 1121. a hollow structure; 1122. a mounting structure; 113. a base plate; 114. a side plate; 1141. a lens hole; 1142. a DMD mounting hole; 1143. a light source mounting hole; 115. a main body lens flange; 1151. installing a groove; 12 a first cover plate; 121. compressing the bulge; 13. a second cover plate; 131. a recessed structure; 132. a notch; 14. dustproof stickers; 15. a heat dissipation light blocking assembly; 151. a heat sink; 1511. a heat dissipating section; 1512. a heat conducting portion; 152. a light blocking member; 1521. an installation part; 1522. a shielding portion;

20. a lens module;

30. a DMD module;

40. a light beam adjusting module; 41. a prism assembly; 42. a fly-eye lens; 43. a lens assembly; 431. a first relay lens; 432. a second relay lens;

50. a light source module; 51. a red light source assembly; 511. a connection terminal; 512. mounting a plate; 52. a green light source assembly; 53. a blue light source assembly; 54. a pump blue light source assembly; 55. a collimating lens; 60. a galvanometer module.

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.

The present invention provides a projection optical machine, as shown in fig. 1-10, the projection optical machine includes an optical chassis 10, a lens module 20, a DMD module 30, a light beam adjusting module 40 and a light source module 50, the optical chassis 10 includes a bottom shell 11, a first cover plate 12 and a second cover plate 13, the bottom shell 11 has a light source cavity 111 and a lens group cavity 112 connected with each other at end portions, i.e., the end portion of the lens group cavity 112 is communicated with the end portion of the light source cavity 111, a main lens flange 115 is connected to a side wall of the lens group cavity 112, the main lens flange 115 extends out of an opening of the lens group cavity 112, i.e., the main lens flange 115 is higher than the side wall of the lens group cavity 112. The light source cavity 111 extends from the lens cavity 112 to a side where the main lens flange 115 is located, that is, the cavity of the light source cavity 111 and the lens cavity 112 form a bent shape, the lens cavity 112 is a strip-shaped cavity, the main lens flange 115 is located at a side of the lens cavity 112 opposite to the length direction, the light source cavity 111 is disposed at one end of the lens cavity 112 along the length direction and extends to a side where the main lens flange 115 is located, and the light source cavity 111 and the main lens flange form an approximately L-shaped cavity, that is, the bottom case 11 has an L-shaped cavity (see the detailed description below). The first cover plate 12 covers the lens chamber 112, and the second cover plate 13 covers the light source chamber 111, so that the first cover plate 12 and the second cover plate 13 enclose the bottom case 11, thereby forming the light source chamber 111 and the lens chamber 112 inside. Specifically, the first cover plate 12, the second cover plate 13 and the bottom case 11 may be connected by screws, clamping, or the like.

The lens module 20 is mounted on the main body lens flange 115; the DMD module 30 is mounted on the outer wall of the lens group chamber 112 away from the light source chamber 111. The beam adjustment module 40 is mounted to the mirror chamber 112 and includes a prism assembly 41 adjacent to the DMD module 30, a fly-eye lens 42 adjacent to the light source chamber 111, and a lens assembly 43 between the prism assembly 41 and the fly-eye lens 42. The light source module 50 is partially installed in the light source cavity 111, and the light emitting direction thereof faces the fly-eye lens 42, the light source module 50 includes a plurality of light source assemblies 51 distributed along the circumferential direction of the light source cavity 111, each light source assembly 51 includes a connection terminal 511, each connection terminal 511 extends out of the second cover plate 13, and is distributed on one side of the light source cavity 111 departing from the lens group cavity 112 and on two opposite sides of the optical axis direction of the lens module 20. Referring to fig. 1-3, the DMD module 30 and the light source cavity 111 are respectively disposed at two ends of the lens group cavity 112 along the length direction (i.e., the X direction), the portion of the light source cavity 111 protruding from the lens group cavity 112 and the lens module 20 are located at the same side of the lens group cavity 112 relative to the length direction (i.e., the X direction), and the light source modules 51 are respectively disposed at two sides of the light source cavity 111 relative to the DMD module 30 along the extending direction (i.e., the Y direction) of the light source cavity 111.

The projection optical machine comprises a bottom shell 11, wherein a mirror group cavity 112 for mounting the light beam adjusting module 40 and a light source cavity 111 for mounting the light source module 50 are arranged on the bottom shell 11, the part of the light source cavity 111 protruding out of the mirror group cavity 112 and the lens module 20 are positioned on the same side of the mirror group cavity 112, and meanwhile, a main body lens flange 115 for mounting the lens module 20 and a connecting terminal 511 of the light source module 50 extend out of the opening side of the bottom shell 11, namely, the main body lens flange and the connecting terminal are positioned on the same side.

After adopting above-mentioned compact overall arrangement, if bottom shell 11 adopts a monoblock apron lid to close mirror group chamber 112 and light source chamber 111, because main part lens flange 115 sets up protrudingly, and connecting terminal 511 arranges along the circumference of light source chamber 111, consequently, at whole projection ray apparatus debugging in-process, when adjusting compound eye lens 42 in mirror group chamber 112, need open whole apron, and will open the apron, need demolish each light source subassembly 51 earlier, this assembly debugging process that will certainly increase whole projection ray apparatus. According to the invention, the split type projector comprises a first cover plate 12 and a second cover plate 13 which are arranged in a split manner, wherein a lens group cavity 112 is covered on the first cover plate 12, and a light source 111 is covered on the second cover plate 13, and by adopting the split type structure, as the fly-eye lens 42 is mainly used as a component to be adjusted when the whole projector is debugged, the first cover plate 12 only needs to be opened, so that the structures such as a connecting terminal 511 and a main body lens flange 115 can be avoided, and the assembly and debugging process is saved; and by opening only the first cover 12, only the spatial area of the portion of the beam adjustment module 40 that needs to be adjusted is exposed, thereby enabling to reduce the probability of dust and the like entering the optical chassis 10.

Specifically, as shown in fig. 7, the bottom case 11 includes a bottom plate 113 and a side plate 114 connected to the periphery of the bottom plate 113, the bottom plate 113 and the side plate 114 form an accommodating cavity, so that a side of the bottom case 11 away from the bottom plate 113 is completely open, and the accommodating cavity is substantially an L-shaped cavity, that is, includes two cavities that are mutually communicated and respectively form the lens group cavity 112 and the light source cavity 111; the main lens flange 115 is disposed on the side plate 114, that is, the main lens flange 115 is formed on the outer side of the side plate 114, and with reference to fig. 7, the side plate 114 is respectively disposed with a lens hole 1141, a DMD mounting hole 1142, and a light source mounting hole 1143 corresponding to each light source assembly 51, the lens hole 1141 and the DMD mounting hole 1142 penetrate through the side wall of the lens group cavity 112, and the light source mounting hole 1143 penetrates through the side wall of the light source cavity 111. Each light source assembly 51 is mounted in the corresponding light source mounting hole 1143, the DMD module 30 is mounted in the DMD mounting hole 1142, and the lens hole 1141 penetrates through the main body lens flange, so that the light beam of each light source assembly 51 enters the fly-eye lens 42, is converged by the lens assembly 43 after being homogenized by the fly-eye lens 42, then enters the DMD module 30 through the prism assembly 41, and the optical signal processed by the DMD module enters the lens module 20 through the reflection of the prism assembly 41, and then forms a projection picture.

In some projection optical machines, in order to increase the resolution of the projection image, the projection optical machine further includes a galvanometer module 60, specifically, a mounting groove 1151 is disposed on a side of the main body lens flange 115 away from the lens group cavity 112, that is, a mounting groove 1151 is disposed on a side of the main body lens flange 115 facing the lens module 20; the galvanometer module 60 is mounted to the mounting groove 1151. In this embodiment, the optical signal processed by the DMD module 30 first enters the mirror oscillating module 60 after being reflected by the prism assembly 41, and then enters the lens module 20 to form a projection image.

The whole bottom case 11 may be an integrally formed structure, for example, the bottom case 11 is an injection molding member integrally manufactured by an injection molding method, and of course, the bottom case 11 may also be formed by other methods. In order to reduce the manufacturing cost of the projection optical machine and facilitate the molding, the bottom case 11 is a plastic case, however, the heat dissipation effect of the plastic case is poor, and the heat in the operation of the DMD module 30 and the light source module 50 is very large, if the heat cannot be quickly conducted out, the long-time aggregation will affect the normal operation of the whole projection optical machine, especially when the galvanometer module 60 is provided, the galvanometer in the galvanometer module 60 has a coil, and if a light beam with high heat enters the galvanometer, the coil may be damaged, in a preferred embodiment of the present invention, the optical machine case further includes a heat dissipation light blocking assembly 15 installed outside the bottom case 11, the heat dissipation light blocking assembly 15 is installed on the bottom case 11, specifically, the bottom of the lens group cavity 112 is provided with a hollow structure 1121 at a position close to the lens main body flange 115; the heat dissipation light blocking assembly 15 is mounted on the outer side of the bottom case 11, and a portion of the heat dissipation light blocking assembly 15 extends into the lens group cavity 112 through the hollow structure 1121 and is located between the main body lens flange 115 and the prism assembly 41, so that a light beam of the DMD module 30 in a dark state (described in detail below) is blocked by the heat dissipation light blocking assembly 15 before entering the mirror vibrating module 60 or the lens module 20, and heat can be conducted to the outside of the bottom case 11 through the heat dissipation light blocking assembly 15 as soon as possible, thereby preventing damage to the mirror vibrating module 60 and reducing influence on a projection effect.

Specifically, referring to fig. 8 and 9, the heat dissipation and light blocking assembly 15 includes a heat dissipation member 151 and a light blocking member 152 connected to the heat dissipation member 151, the heat dissipation member 151 includes a heat dissipation portion 1511 having heat dissipation fins and a heat conduction portion 1512 connected to the heat dissipation portion 1511, the heat dissipation portion 1511 is connected to the outside of the bottom case 11, and the heat conduction portion 1512 extends between the prism assembly 41 and the main lens flange 115. The heat dissipation portion 1511 may have a plate-like structure, and heat dissipation fins are provided on an outer surface thereof; the heat conducting portion 1512 may be a block structure, a plate structure, or the like, and extends into the lens group cavity 112 through the hollow structure 1121, so as to conduct heat in the lens group cavity 112, especially heat in a dark state of the DMD module 30, as far as possible, so as to reduce the influence on the galvanometer module 60 and the whole projection quality.

The light blocking member 152 includes an installation portion 1521 installed on the heat dissipation portion 1511 and a shielding portion 1522 connected to the installation portion 1521, the shielding portion 1522 extends into the lens group cavity 112 and is located on a light path of the DMD module between the lens module 20 and the prism assembly 41 in a dark state, so the shielding portion 1522 mainly shields light of the DMD module 30 in the dark state to prevent the light from entering, and the shielding portion 1522 can conduct heat generated by the shielded light to the installation portion 1521 as soon as possible, because the installation portion 1521 is directly connected to the heat dissipation portion 1511, heat dissipation can be performed through the heat dissipation fins as soon as possible, and therefore, the heat dissipation efficiency is improved. Specifically, the mounting portion 1521 and the shielding portion 1522 may be a sheet structure, a plate structure, a block structure, or the like, preferably a sheet structure or a plate structure, so as to reduce the space occupation between the prism assembly 41 and the galvanometer module 60 as much as possible, increase the bonding area with the heat dissipation portion 1511, and improve the heat dissipation efficiency.

Further, in the projection direction of the lens module 20, the heat conducting portion 1512 and the shielding portion 1522 are overlapped at least in part in projection, so the heat conducting portion 1512 can block the light beam of the DMD module 30 in the dark state once, and conduct heat away at the same time, and the portion of the light beam of the DMD module 30 in the dark state, which is not absorbed by the heat conducting portion 1512, is blocked secondarily by the shielding portion 1522, thereby further improving the shielding effect on the light beam of the DMD module 30 in the dark state and other ineffective light beams, and generating a heat leading-out effect on the light beams as soon as possible, improving the heat dissipation efficiency, and further improving the projection effect of the projection optical engine.

Specifically, the mounting structure 1122 is disposed on the inner side wall of the lens group cavity 112, and the mounting structure 1122 is located at a side close to the opening of the bottom shell 11 and is opposite to the hollowed-out structure 1121, that is, in the opening direction of the bottom shell 11, the mounting structure 1122 is located at a side of the side plate 114 away from the bottom plate 113. The lens assembly 43 includes a first relay lens 431 proximate to the prism assembly 41, the first relay lens 431 being mounted to a mounting structure 1122. At this time, the heat conducting portion 1512 is disposed opposite to the mounting structure 1122, that is, the heat conducting portion 1512 extends from the hollow structure 1121 into the lens group cavity 112 and is located on a side of the mounting structure 1122 close to the bottom plate 113. By adopting the arrangement mode, the structure of the whole optical enclosure is more compact, and the space utilization rate of the whole optical enclosure can be further improved.

Further, the heat conducting portion 1512 surrounds part of the edge of the prism assembly 41, specifically, the heat conducting portion 1512 has a concave surface, and the prism assembly 41 is partially located in the concave surface, so that the ineffective light can be better shielded, the area of the heat conducting portion 1512 can be increased, and the heat dissipation efficiency is improved.

Since the shielding portion 1522 and the heat conducting portion 1512 extend into the lens group cavity 112, in order to prevent the shielding portion from shielding the effective light in the light path, the heat dissipating member 151 and the bottom case 11, and the heat dissipating member 151 and the light blocking member 152 are further positioned by positioning structures, specifically, one of the two in mutual positioning may be provided with a positioning protrusion, and the other one is provided with a positioning hole, and the positioning is realized by the insertion and matching of the positioning protrusion and the positioning hole; or one positioning groove and the other positioning block are arranged, and positioning is realized through the insertion and the matching of the positioning blocks and the positioning grooves, and of course, positioning can also be realized by other modes. Through the location between radiating element 151 and the drain pan 11, between radiating element 151 and the light blocking element 152, can prevent to sheltering from the effect, and can improve and shelter from the light beam when DMD module 30 is dark attitude better to improve the projection effect of whole projection ray apparatus.

Further, the first cover plate 12 and the second cover plate 13 are metal plates to further increase the heat dissipation efficiency of the whole optical chassis; and the first cover plate 12 and the second cover plate 13 are made of the same material, so that the manufacturing cost can be reduced.

When the second cover 13 is a metal plate, since the connection terminal 511 is located above the second cover 13, there may be a risk that the connection terminal 511 contacts the second cover 13, and in a preferred embodiment of the present invention, the connection terminal 511 is spaced apart from the second cover 13, that is, a sufficient distance is left between the second cover 13 and the connection terminal 511 after the second cover 13 and the connection terminal 511 are mounted. In another preferred embodiment of the present invention, the opening of the bottom case 11 is formed in a stepped structure, that is, the end surface of the side plate 114 is partially recessed, and the first cover plate 12 and the second cover plate 13 are both mounted on the stepped surface of the stepped structure, so that the first cover plate 12 and the second cover plate 13 do not substantially protrude from the bottom case 11, thereby reducing the possibility that the second cover plate 13 contacts the connection terminal 511; by adopting the stepped structure, in the embodiment that the second cover plate 13 is spaced from the connection terminal 511, the size of the whole optical chassis in the height direction Z can be reduced as much as possible while the spacing distance between the second cover plate 13 and the connection terminal 511 is ensured to be constant, which is beneficial to the development trend of miniaturization; meanwhile, with this structure, the relative positioning accuracy of the first cover plate 12 and the second cover plate 13 and the bottom case 11 can be increased, and particularly in the embodiment where the first cover plate 12 and the second cover plate 13 are provided with the pressing protrusions 121 (see the following detailed description), the pressing force on the prism assembly 41 and the lens assembly 43 can be ensured, thereby improving the installation accuracy of the whole light beam adjustment module 40. In another preferred embodiment, the optical chassis 10 further includes an insulating film (not shown), and the outer side of the second cover plate 13 is covered with the insulating film.

It should be noted that, in the embodiment that the second cover 13 is a non-metal plate, such as a plastic plate, a space may be provided between the second cover 13 and the connection terminal 511, and similarly, the opening of the bottom case 11 may also be provided with a step structure.

In some embodiments, the first cover 12 may be a metal plate, and the second cover 13 may be a plastic plate, so that the second cover 13 and the connection terminal 511 may be prevented from being short-circuited. In this embodiment, it is further obvious that the heat dissipation area of the whole optical chassis 10 is reduced, for this reason, in a preferred embodiment of the present invention, the notch may be recessed to a side far away from the DMD module 30 as much as possible, so that the first cover plate 12 extends to the light source cavity 111 as much as possible, thereby increasing the area of the first cover plate 12 as much as possible, but in any case, the projection of the notch is staggered with the projection of each connection terminal along the opening direction of the light source cavity 111, i.e., in the Z direction, so as to facilitate the opening of the first cover plate 12 alone. Of course, the first cover plate 12 may also be a non-metal plate, such as a plastic plate.

Referring to fig. 6, the inner side of the first cover plate 12 is protrudingly provided with a pressing protrusion 121, and the pressing protrusion 121 may be formed by recessing the first cover plate 12 to the inner side (i.e., the side where the bottom plate 113 is located), that is, forming a recessed structure on the outer surface in the entire area and forming the pressing protrusion 121 on the inner surface; the pressing protrusion 121 may also be formed by directly protruding from the inner surface of the first plate 12 toward the bottom plate 113, and in any forming manner, after the first cover plate 12 is covered with the bottom case 11, the pressing protrusion 121 is pressed against the prism assembly 41 and the lens assembly 43 to press the prism assembly 41 and the lens assembly 43 tightly, so as to improve the installation accuracy of the whole light beam adjustment module 40; and in the embodiment in which the pressing protrusions 121 are formed in a recessed manner, it is also possible to improve the strength of the entire first cover plate 12. Specifically, an elastic structure, such as a buffer elastic structure like a rubber pad or a foam pad, may be disposed in an area where the first cover plate 12 presses against the prism assembly 41 and the lens assembly 43, and the first cover plate 12 presses the prism assembly 41 and the lens assembly 43 through the buffer structure to further increase the pressing force on the prism assembly 41 and the lens assembly 43, and the damage to the prism assembly 41 and the lens assembly 43 can be prevented by increasing the elastic structure.

Here, the second cover plate 13 may be provided with a recess structure 131 formed by being recessed inward, as shown in fig. 6, to increase the strength of the entire second cover plate 13. Similarly, the first cover plate 12 may also be provided with a concave structure 131.

With continued reference to fig. 6, in an embodiment, the second cover plate 13 is provided with a notch 132 towards the side edge of the first cover plate 12, and a projection of the notch 132 is staggered with a projection position of each connection terminal 511 along the opening direction (i.e. Z direction) of the light source cavity 111. After the arrangement, when the first cover plate 12 is detached, the open space of the bottom case 11 is larger and even extends to the light source cavity 111, so that a larger operation space can be provided for adjusting the fly-eye lens 42, and the adjustment is more convenient; by adopting the structure, especially when the first cover plate 12 is a metal plate and the second cover plate 13 is a plastic plate, the area of the metal plate can be increased as much as possible, and the heat dissipation effect is improved.

After the first cover plate 12 and the second cover plate 13 are separated, impurities such as dust can easily enter into the joint of the first cover plate 12 and the second cover plate 13, and the projection optical machine is extremely sensitive to the impurities such as dust, and the quality of the whole projection picture can be seriously affected.

It can be understood that each light source module 51 further includes a mounting plate 512 and a light emitting device mounted on the mounting plate 512, the connection terminal 511 can also be directly mounted on the mounting plate 512, such as being directly welded on the mounting plate 512, the light emitting device can be an LED light source, as shown in fig. 2, a red light source module 51, a green light source module 52, a blue light source module 53 and a pumping blue light source module 54 are provided, when a plurality of light emitting source modules are provided, the light source module 50 can further include a plurality of optical lenses, such as a collimating lens 55 disposed corresponding to each light source module, and a splitting lens, a relay lens and the like in a light path incident to the fly eye lens 42 through the collimating lens 55, specifically, optical axes of the pumping blue light source module 54 and the blue light source module 53 are disposed vertically, the green light source module 52 is disposed opposite to the pumping blue light source module 54, the red light source module 51 and the blue light source module 53 are disposed at the same side of the light source cavity 111, thus, the light beams of each light source assembly collimated by the corresponding collimating lens 55 form collimated light beams after passing through the optical lens, and enter the fly-eye lens 42 together, so that the brightness of the light mixture of the three-color light sources is more uniform through the fly-eye lens 42.

With continued reference to fig. 2, the lens assembly 43 further includes a second relay lens 432, the second relay lens 432 is disposed between the first relay lens 431 and the fly-eye lens 42, and the second relay lens 432 and the first relay lens 431 together converge the homogenized light beam of the fly-eye lens 42, so as to form a predetermined cross-sectional shape of the light beam, such as a light beam with a rectangular cross-section, and the converged light beam enters the prism assembly 41, is processed by the prism assembly 41, and then enters the DMD module 30. The prism assembly 41 may include a triangular prism, specifically, a right-angle triangular prism, two right-angle surfaces of the right-angle triangular prism are respectively attached to two adjacent side walls of the mirror group cavity 112, and an inclined surface faces the first relay lens 431, and in this embodiment, the first relay lens 431 may be a free-form surface lens; in some embodiments, the prism assembly 41 may also include two triangular prisms, and correspondingly, the first relay lens 431 may be a spherical lens; of course, the lens assembly 43 and the prism assembly 41 may also adopt a combination of other optical elements, which is not limited to this, and only the optical path from the fly-eye lens 42 to the DMD module 30 needs to be set according to the requirement, and a light shielding element or a heat dissipation element may be added to the optical path according to the requirement.

Accordingly, when the above optical elements (including the prism in the prism assembly 41, the fly-eye lens 42, the lens assembly 43, and the lenses in the light source module 50) are provided, the interior of the bottom case 11 may be provided with the mounting structure of the optical elements, and the positioning structure.

The DMD module 30 includes a DMD device having an "ON" state (i.e., an ON state) and an "OFF" state (i.e., an OFF state or a dark state), and the human eye integrates the luminance of the "ON" state, and the luminance is higher when the "ON" state is longer (or the "OFF" state is shorter). Specifically, when the DMD device works, a light beam enters the surface of the DMD device at a certain angle, and when the DMD device is in an "ON" state, the light reflected by the DMD device enters the lens module 20 (or enters the lens module 20 through the mirror vibrating module 60) and is finally projected onto a screen or a wall surface; when the DMD device is in the OFF state, the light reflected by the DMD device needs to be prevented from entering the lens module 20 or the galvanometer module 60 as much as possible.

In addition, the invention further provides a projection device, which includes a main chassis and the projection optical engine described in any of the above embodiments, wherein the projection optical engine is installed on the main chassis, specifically, a light exit hole is formed on the main chassis, and the lens module 20 corresponds to the light exit hole so as to project onto a screen or a wall surface through the light exit hole.

It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

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 invention.

Claims

1. A projection optical machine comprises an optical case, a lens module, a galvanometer module, a DMD module, a light beam adjusting module and a light source module,

the galvanometer module is mounted in the mounting groove;

the lens module is arranged on the main body lens flange;

the heat dissipation light blocking assembly is installed on the outer side of the bottom shell, and part of the heat dissipation light blocking assembly extends into the lens group cavity through the hollow structure and is located between the main body lens flange and the prism assembly.

2. The optical projection engine according to claim 1, wherein the second cover plate is provided with a notch towards a side edge of the first cover plate, and a projection of the notch is staggered with a projection position of each connecting terminal along an opening direction of the light source cavity; the first cover plate extends into the gap to extend.

3. The projector as defined in claim 1, wherein the first cover plate is a metal plate, the second cover plate is a plastic plate or a metal plate, and a joint of the first cover plate and the second cover plate is covered with a dust-proof sticker.

4. The light engine of claim 1, wherein a space is left between the connection terminal and the second cover plate.

5. The optical projection engine of claim 1, wherein the openings of the mirror group cavity and the light source cavity are in a step structure, and the first cover plate and the second cover plate are both mounted on a step surface of the step structure.

6. The light engine of any of claims 1-5, wherein a pressing protrusion protrudes from an inner side of the first cover plate, and the pressing protrusion presses against the prism assembly and the lens assembly.

7. The projection optical machine according to any of the claims 1-6, wherein the heat dissipation and light blocking assembly comprises a heat dissipation member and a light blocking member connected to the heat dissipation member, the heat dissipation member comprises a heat dissipation portion having heat dissipation fins and a heat conduction portion connected to the heat dissipation portion, the heat dissipation portion is connected to the outer side of the bottom casing, and the heat conduction portion extends between the prism assembly and the main lens flange;

8. The optical-mechanical projector of claim 7, wherein the inner sidewall of the mirror group cavity is provided with a mounting structure, and the mounting structure is located at a side close to the bottom case opening and is opposite to the hollowed-out structure; the lens assembly includes a first relay lens proximate the prism assembly, the first relay lens being mounted to the mounting structure;

the thermally conductive portion is disposed opposite the mounting structure.

9. The optical engine of claim 8, wherein the heat conducting portion surrounds a portion of an edge of the prism assembly, and the heat conducting portion and the shielding portion at least partially overlap in projection in an optical axis direction of the lens module.

10. A projection device comprising a main housing and the light engine of any of claims 1-9, wherein the light engine is mounted to the main housing.