CN218158683U

CN218158683U - Projection optical machine and projection device

Info

Publication number: CN218158683U
Application number: CN202121778575.8U
Authority: CN
Inventors: 孙峰; 吴积涛; 王源; 朱青
Original assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Current assignee: Shenzhen Anhua Photoelectric Technology Co ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-12-27
Anticipated expiration: 2031-07-30

Abstract

The utility model provides a projection ray apparatus, including smooth casing, DMD subassembly, camera lens module and light emitting module, at least a part of light emitting module and the optical adjustment module is installed in the smooth casing, DMD subassembly and camera lens module are fixed in on the smooth casing, set up the chamber of acceping DMD on the smooth casing, the circuit board is close to DMD one side and sets up, the shell fragment sets up the one side that the DMD was kept away from to the circuit board, the gasket sets up between shell fragment and the circuit board; the edge of the elastic sheet is fixed on the optical case, the elastic sheet is a plate-shaped body which can be elastically deformed under stress, the elastic sheet is in contact with the circuit board and compresses the circuit board and the DMD on the optical case, and the circuit board is in electrical contact with the DMD. The utility model also provides a projection arrangement including above-mentioned projection ray apparatus. The utility model provides a projection ray apparatus and projection arrangement has simple structure, the stable advantage of electric connection.

Description

Projection optical machine and projection device

Technical Field

The utility model relates to a projection arrangement field especially relates to a projection ray apparatus and projection arrangement.

Background

The projector is widely applied to different occasions such as teaching, scientific research, meetings, reports and the like as office equipment. The digital light processing projector which occupies a larger market share at present adopts a digital micro-mirror device DMD as an imaging device and has the characteristics of high native contrast, small machine, closed light path and the like. The DMD is a projection technology for projecting an image by adjusting reflected light as a core component of a digital light processing projector. It is very different from a liquid crystal projector, and its imaging is realized by reflecting light by thousands of tiny mirrors. The micro lenses are required to be driven by the circuit board integrated with the driving circuit, the existing machine type realizes the electrical connection of the micro lenses and the circuit board through the contact between the DMD and the circuit board, but in the contact type electrical connection, the phenomenon that the electrical connection is unstable to influence the performance of a projector easily occurs, and how to design a stable DMD and circuit board electrical connection structure has important significance for the projector.

SUMMERY OF THE UTILITY MODEL

Based on the current situation, a primary objective of the present invention is to provide a projection optical machine, which includes an optical housing, a DMD component, a lens module and a light emitting module, wherein the optical housing is a hollow housing, at least a part of the light emitting module and the optical adjustment module are installed in the optical housing, the DMD component and the lens module are fixed on the optical housing, the DMD component includes a DMD, a sealing member, a circuit board, a sealing piece and a spring piece, the optical housing is provided with an accommodating cavity, the DMD is accommodated in the accommodating cavity, the sealing member is disposed around the DMD, the circuit board is disposed near one side of the DMD, the spring piece is disposed on one side of the circuit board away from the DMD, and the sealing piece is disposed between the spring piece and the circuit board; the edge of the elastic sheet is fixed on the optical case, the elastic sheet is a plate-shaped body which can be elastically deformed under stress, the elastic sheet is in contact with the circuit board and compresses the circuit board and the DMD on the optical case, and the circuit board is in electrical contact with the DMD.

Preferably, the DMD includes a first conductive region, the circuit board includes a second conductive region corresponding to the first conductive region, and the DMD is in electrical contact with the circuit board at positions of the first conductive region and the second conductive region; the elastic sheet is provided with a protruding part protruding towards the DMD at a position corresponding to the first conductive area and the second conductive area, and in an installation state, the elastic sheet is in contact with the circuit board through the protruding part and presses the circuit board and the DMD onto the optical case.

Preferably, the elastic sheet is a metal sheet, the protruding portion is a plurality of protruding strips formed by bending the plate-shaped body, and the elastic sheet is in line contact with the circuit board through the protruding strips.

Preferably, the elastic sheet comprises a first plate body, a first convex strip, a second plate body, a second convex strip and a third plate body, and in a natural state, the first plate body, the second plate body and the third plate body are positioned in the same plane, and the second plate body is positioned between the first plate body and the third plate body; the first plate body is connected with the second plate body through the first convex strip, and the second plate body is connected with the third plate body through the second convex strip; the cross sections of the first protruding strips and the second protruding strips in the direction perpendicular to the extending direction of the first protruding strips and the second protruding strips are V-like.

Preferably, the elastic sheet is a plate-shaped body made of metal, and can be elastically deformed when being stressed.

Preferably, the sealing sheet is arranged between the first protruding strip and the second protruding strip, the pressure part of the elastic sheet on the circuit board is directly applied to the circuit board, and the part of the pressure part is applied to the circuit board through the sealing sheet.

Preferably, the projection optical machine includes a first fixing structure, the first fixing structure includes an installation part, installation holes distributed on the edge of the elastic sheet and located in a plurality of different directions, and installation columns located on the optical chassis and corresponding to the installation holes, the installation part passes through the installation holes and is fixed on the installation columns to fix the elastic sheet and the optical chassis.

Preferably, the sealing member has a sealing and buffering function, and the sealing member is compressed between the optical chassis and the circuit board.

Preferably, a heat dissipation assembly fixed with the optical machine casing is arranged on one side, away from the DMD, of the elastic sheet, the heat dissipation assembly comprises a heat dissipation main body and a heat conduction column, the heat conduction column is fixed on one side, close to the DMD, of the heat dissipation main body, the heat conduction column penetrates through the elastic sheet, the sealing sheet and the circuit board to be in contact with the DMD, and at least part of heat generated by the operation of the DMD is transferred to the heat dissipation main body through the heat conduction column; in the installation state, a space is reserved between the side face, close to the DMD, of the heat dissipation main body and the elastic sheet.

The utility model also provides a projection arrangement, which comprises an outer shell, projection arrangement still includes as above the projection ray apparatus, the projection ray apparatus is installed in the shell.

The utility model provides a shell fragment is fixed with the ray apparatus shell, compress tightly DMD and circuit board simultaneously and fix between ray apparatus shell and shell fragment, both realized the fixed of components and parts between ray apparatus shell and the shell fragment, still combine the gasket through the deformation characteristic of self to compress tightly circuit board and DMD together, electric connection's stability has been strengthened, whether can also more directly perceived impression and judgement compress tightly the state in the installation of shell fragment is appropriate, set up compact structure in addition in having overcome traditional projection ray apparatus, not only the structure is complicated, it is inconvenient to install, it leads to the shortcoming of unstable or components and parts pressure loss of electric connection to compress tightly the state difficult to control.

The utility model discloses be line contact between well shell fragment and the circuit board, the centre gripping is at the gasket between the two again, can provide suitable and even pressure for the circuit board.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art can understand the technical advantages brought by the technical features and technical solutions through the descriptions of the technical features and the technical solutions.

Drawings

A preferred embodiment of a projection optical machine and a projector according to the present invention will be described below with reference to the accompanying drawings. In the figure:

fig. 1 is a schematic perspective view of the projection optical machine of the present invention.

Fig. 2 is an explosion structure diagram of the projection light machine of the present invention.

Fig. 3 is a schematic view of the three-dimensional structure of the DMD assembly removing part of the projection optical device of the present invention.

Fig. 4 is a schematic diagram of a three-dimensional structure of a circuit board in a projection optical machine according to the present invention.

Fig. 5 is a schematic perspective view of the sealing plate of the projection light machine of the present invention.

Fig. 6 is a schematic perspective view of the elastic sheet of the projector.

Fig. 7 is a schematic view of a three-dimensional structure of the elastic sheet in the projection optical device of the present invention at another viewing angle.

Fig. 8 is a top view of the elastic sheet of the projector of the present invention at the viewing angle of fig. 6.

Fig. 9 is an enlarged schematic view of a portion a in fig. 8.

Fig. 10 is a partial structural view of the heat dissipation assembly.

Reference numerals:

1. a projection light machine; 2. a light emitting module; 3. a lens module; 10. an optical chassis; 101. an accommodating cavity; 11. a DMD component; 12. DMD; 13. a seal member; 14. a circuit board; 143. a first through hole; 15. sealing the sheet; 151. a second through hole; 16. a spring plate; 165. mounting holes; 102. mounting a column; 170. a mounting member; 161. a boss portion; 167. avoiding the mouth; 162a, a first plate body; 162b, a second plate body; 162c a third plate; 163. a third through hole; 167. avoiding the mouth; 17. a heat dissipating component; 171. a heat dissipating main body; 1711. a substrate; 1715. a fixing hole; 1713. a heat sink; 173. a fixing member; 103. fixing a column; 175. a heat-conducting column.

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, such that well-known methods, procedures, flows, and components have not been described in detail so as not to obscure the present invention.

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, the present invention provides a projection optical machine 1 for projecting an image onto a projection surface such as a curtain or a wall. Projection ray apparatus 1 includes DMD subassembly 11, ray apparatus shell 10, light emitting module 2, optics adjustment module (being located inside ray apparatus shell 10, not numbered) and camera lens module 3, ray apparatus shell 10 is inside hollow casing, light emitting module 2 part is installed on ray apparatus shell 10, the part is installed in ray apparatus shell 10, optics adjustment module installs in ray apparatus shell 10, DMD subassembly 11 and camera lens module 3 set up at the relative both ends of ray apparatus shell 10 and optics adjustment module are located between DMD subassembly 11 and camera lens module 3. Light emitted by the light emitting module 2 is optically adjusted by the optical adjusting module, then is imaged by the DMD assembly 11, and is projected onto the projection surface from the lens module 3 by the optical adjusting module.

It is understood that DMD assembly 11 and lens module 3 may be secured to adjacent sides of light housing 10.

The light emitting module 2 includes components including, but not limited to, one or more of a red light source, a blue light source, a green light source, a pump-compensated blue light source, a collimating lens, a converging lens, and a beam splitter. The red light source, the blue light source and the green light source are installed on the light cabinet 10, the collimating lens, the converging lens and the beam splitter are installed in the light cabinet 10, and light emitted by the light sources (including one or more of the red light source, the blue light source and the green light source) enters the optical adjustment module after being processed by one or more of the collimating lens, the converging lens and the beam splitter.

The optical adjustment module includes optical elements including, but not limited to, one or more of a fly-eye lens, a relay lens, or a prism or a galvanometer. The lens module 3 may be provided with an optical element for optical processing. The light emitted by the light emitting module is optically adjusted by the optical adjusting module, then imaged by the DMD assembly 11, and projected from the lens module 3 to the projection surface through other optical elements (such as a vibrating mirror or a flat sheet).

Referring to fig. 2, the DMD assembly 11 is installed on one side of the optical chassis 10, the DMD assembly 11 includes a DMD12, a sealing member 13, a circuit board 14, a sealing sheet 15, a spring sheet 16 and a heat dissipation assembly 17, the dmdd 12 is fixed on the optical chassis 10, the sealing member 13 is disposed around the DMD12, the spring sheet 16 has a spring sheet main body 16a and an installation portion 16b, the circuit board 14, the sealing sheet 15 and the spring sheet main body 16 are sequentially stacked on one side of the DMD12 from near to far with respect to the DMD12, and the installation portion 16b is fixed to the optical chassis 10.

Referring to fig. 2 and 3, a receiving cavity 101 is formed on a side surface of the optical housing 10, the dmdd 12 is received in the receiving cavity 101, a plurality of electrical connection points (not shown) are disposed on a side surface of the DMD12 close to the circuit board 14, the plurality of electrical connection points define a first conductive area, and the DMD12 is electrically connected to the circuit board 14 through the plurality of electrical connection points. DMD12 is subject to a maximum withstand pressure of N, i.e., is susceptible to damage when subjected to a force exceeding pressure N.

With continued reference to fig. 2, the sealing element 13 has a sealing function and is annular in shape. It is preferable that a sealing member 13 with a certain buffering function is compressed between the optical housing 10 and the circuit board 14, so that external light or dust can be effectively prevented from entering the DMD12 to affect the operation thereof.

Referring to fig. 4, a first through hole 143 is formed in a central region of the circuit board 14 for allowing a portion of the heat sink 17 to pass through so as to dissipate the operating heat of the DMD 12. A plurality of electrical connection points (not shown) are disposed on a side of circuit board 14 adjacent to DMD12, and define a second conductive region disposed around first via 143. The electrical connection points in the first conductive area correspond to the electrical connection points in the second conductive area one by one, and when the circuit board 14 contacts the DMD12, the electrical connection points in the first conductive area are electrically connected to the electrical connection points in the second conductive area one by one, so that the DMD12 and the circuit board 14 are electrically connected to each other. It can be understood that the electrical connection points on the DMD12 and the circuit board 14 are respectively formed on the connectors, that is, the DMD12 is provided with a connector, the circuit board 14 is provided with another connector, and the two connectors are butted after being stressed (connection force) to realize reliable electrical connection between the circuit board 14 and the DMD12, so as to keep the minimum connection force of the electrical connection between the two connectors as M.

It will be appreciated that the actual form of the electrical connection points include, but are not limited to, one or more of contacts, probes, sockets, pins, or the like. As long as the electrical connection points in the first conductive area and the electrical connection points in the second conductive area can be electrically connected in a one-to-one matching manner. The circuit board 14 may be a rigid circuit board 14 or a flexible circuit board 14 or a combination of both.

Referring to fig. 5, a sealing sheet 15 is disposed between the elastic sheet 16 and the circuit board 14 for sealing, and alternatively, the sealing sheet 15 may be made of a material with sealing and buffering functions to buffer the pressure of the elastic sheet 16 on the circuit board 14, so that the circuit board 14 is stressed uniformly, moderately and properly. The central region of the sealing sheet 15 is provided with a second through hole 151 through which a part of the heat dissipating module 17 passes.

Referring to fig. 6 and 7, the resilient plate 16 is a plate made of metal, and can be elastically deformed by a force. The elastic sheet 16 is fixedly mounted on the optical chassis 10 through a first fixing structure, the first fixing structure includes mounting holes 165 (mounting portions 16 b) distributed at the edge portions of the elastic sheet 16 and located in a plurality of different directions, and mounting posts 102 (the labels are shown in fig. 3) located on the optical chassis 10 and corresponding to the mounting holes 165, the first fixing structure further includes mounting pieces 170 (the labels are shown in fig. 2), and the mounting pieces 170 penetrate through the mounting holes 165 to be fixed on the mounting posts 102 so as to achieve direct fixation between the elastic sheet 16 and the optical chassis 10. It can be understood, the utility model discloses in, shell fragment 16 is direct fixed with light casing 10, compress tightly DMD12 and circuit board 14 simultaneously and fix between light casing 10 and shell fragment 16, the fixing of components and parts between both realized light casing 10 and shell fragment 16, still combine gasket 15 to compress tightly circuit board 14 and DMD12 together through the deformation characteristic of self, electric connection's stability has been strengthened, whether can also more directly perceivedly experience and judgement compression state in shell fragment 16's installation, it sets up compact structure in addition to have overcome traditional projection ray apparatus 1, not only the structure is complicated, the installation is inconvenient, compression state is difficult to control and leads to the shortcoming of electric connection unstability or components and parts pressure loss.

With continued reference to fig. 6 and 7, the edge of the elastic sheet 16 is provided with an avoiding opening 167 for avoiding other components. The center of the elastic sheet 16 is provided with a third through hole 163 for passing a part of the heat dissipation assembly 17 so as to dissipate the heat generated by the operation of the DMD 12. The elastic sheet 16 is bent to form a protruding portion 161 protruding toward the DMD12, and in a state where the assembly of the projection optical engine 1 is completed, the elastic sheet 16 contacts the circuit board 14 through the protruding portion 161 and compresses the circuit board 14, the contact between the elastic sheet 16 and the circuit board 14 is line contact, the circuit board 14 and the DMD12 are in close electrical contact under the compression of the elastic sheet 16, and the stability of electrical connection is increased. The utility model discloses in, bellying 161 is many sand grips of plate-like body bending type one-tenth, is parallel to each other between the sand grip. The number of the convex strips is preferably 2, and the convex strips are respectively a first convex strip 161a and a second convex strip 161b.

Specifically, the resilient tab 16 includes a first plate 162a, a second plate 162b and a third plate 162c, and in a natural state, the first plate 162a, the second plate 162b and the third plate 162c are located in the same plane, and the second plate 162b is located between the first plate 162a and the third plate 162 c; the first plate 162a and the second plate 162b are connected by a first protruding strip 161a, and the second plate 162b and the third plate 162c are connected by a second protruding strip 161 b; the sealing piece 15 is disposed between the first convex strip 161a and the second convex strip 161b. The mounting portion 16b is provided on the first plate 162a and the third plate 162 c.

It is understood that the first plate 162a and the third plate 162c are located on the same plane, and the second plate 162b may not be coplanar with the first plate 162a and the third plate 162c, for example, the distance between the second plate 162b and the circuit board 14 may be smaller than the distance between the first plate 162a or the third plate 162c and the circuit board 14. Preferably, the distance between the second plate 162b and the circuit board 14 is smaller than the thickness of the sealing sheet 15 in the natural state, so that the sealing sheet 15 can better cooperate with the protruding strip to provide a soft and uniform pressure to the circuit board 14.

Referring to fig. 8 and 9, the first and

second ribs

161a and 161b are elongated and have a V-like cross section perpendicular to their extension direction. It is understood that V-like shape includes shapes that are (or approximate to) V-shape or C-shape or U-shape, etc. As long as it is ensured that a protrusion is formed on the spring 16 near the circuit board 14, the protrusion may be formed by bending a metal plate or by separately manufacturing the plate (the first plate 162a and/or the second plate 162 b/the third plate 162 c) and the protrusion 161 and then fixedly connecting the plate by welding or any other connection method.

It is understood that the number of the convex portions 161 is not limited to 2, but may be a plurality of convex portions 161, such as 3, 4 or more convex portions 161 may be uniformly formed on the plate body. The overall shape of the protrusion is not limited, and the protrusion may be a strip shape as shown in the drawings, and may be a hemispherical shape or a frustum shape fully distributed on the plate body or a part of the plate body. The cross-section of the boss 161 defines a V-like shape, which may be a T-square or other regular or irregular shape.

Referring to fig. 8, the structure of the protruding portion 161 has a certain length and thickness, and is designed according to the size parameters and performance of the DMD12, the connector, and the circuit board, as an embodiment, the force exerted by the elastic sheet 16 on the circuit board 14 through the protruding portion 161 is F, the maximum bearing pressure of the DMD12 is N, and M is greater than or equal to F and less than or equal to N.

The projection of the convex strip on the electrical contact surface of the DMD12 and the circuit board 14 is at least partially located in the first conductive area or the second conductive area. The strength of the protruding strip can be better applied to the area where the electrical connection point of the DMD12 and the circuit board 14 is located, thereby effectively ensuring the reliability of the electrical connection between the two.

Referring to fig. 2 and 10, a heat dissipation assembly 17 fixed to the optical housing 10 is disposed on one side of the dmdd 12, the heat dissipation assembly 17 includes a heat dissipation body 171 and a heat conduction post 175, the heat conduction post 175 is fixed to one side of the heat dissipation body 171 close to the DMD12, the heat conduction post 175 passes through the third through hole 163 on the elastic sheet 16, the second through hole 151 on the sealing sheet 15 and the first through hole 143 on the circuit board 14 to contact the DMD12, and at least a portion of heat generated by the operation of the DMD12 is transferred to the heat dissipation body 171 through the heat conduction post 175.

The heat dissipation main body 171 is fixed on the optical chassis 10 through a second fixing structure, the second fixing structure includes a fixing hole 1715 disposed on the heat dissipation main body 171 and a fixing column disposed on the optical chassis 10, the second fixing structure further includes a fixing member 173 and a spring (see fig. 2) sleeved on the fixing member 173 and having a pressure buffering effect, the fixing member 173 penetrates through the fixing hole 1715 and is fixed on the fixing column 103, and the direct fixation of the heat dissipation assembly 17 and the optical chassis 10 is achieved. In the installation state, the side of the heat dissipation main body 171 close to the DMD12 is spaced from the elastic sheet 16, so that the circuit board 14 and/or the DMD12 can be prevented from being damaged due to the pressure exerted on the elastic sheet 16 by the heat dissipation assembly 17, and the problem that the mutual interference between the fixing structure of the heat dissipation assembly and the circuit board and the DMD fixing structure on the traditional projection optical machine is difficult to control is avoided.

The heat dissipation body 171 includes a base 1711 and fins 1713, the base 1711 is a plate, the fixing holes 1715 are disposed on the base 1711, and the fins 1713 are disposed on the side of the base 1711 away from the DMD 12.

The first through hole 143, the second through hole 151, and the third through hole 163 have a square shape, and the positions thereof are respectively located in the central areas of the components where the first through hole, the second through hole, and the third through hole are not limited as long as the heat dissipation columns can pass through the positions; the shape of the heat sink is not limited, and the heat sink is adapted to the shape of the heat conducting post 175 of the heat sink assembly 17.

When the projection optical machine 1 is installed, the elastic sheet 16, the circuit board 14 and the DMD12 are fixed on the optical chassis 10 by the first fixing structure, and then the heat dissipation assembly 17 is fixed on the optical chassis 10 by the second fixing structure.

The utility model also provides a projection arrangement (not shown), projection arrangement include the shell and as above projection ray apparatus 1, projection ray apparatus 1 installs in the projection arrangement.

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

Claims

1. The utility model provides a projection ray apparatus, includes light casing, DMD subassembly, camera lens module and light emitting module, and the light casing is inside hollow casing, at least partly and the optical adjustment module of light emitting module install in the light casing, DMD subassembly and camera lens module are fixed in on the light casing, its characterized in that: the DMD component comprises a DMD, a sealing piece, a circuit board, a sealing piece and an elastic piece, wherein an accommodating cavity is formed in the optical machine shell, the DMD is accommodated in the accommodating cavity, the sealing piece is arranged around the DMD, the circuit board is arranged close to one side of the DMD, the elastic piece is arranged on one side, far away from the DMD, of the circuit board, and the sealing piece is arranged between the elastic piece and the circuit board;

the edge of the elastic sheet is fixed on the optical enclosure, the elastic sheet is a plate-shaped body which can be elastically deformed under stress, the elastic sheet is in contact with the circuit board and compresses the circuit board and the DMD on the optical enclosure, and the circuit board is in electrical contact with the DMD.

2. The light engine of claim 1, wherein: the DMD comprises a first conductive area, the circuit board comprises a second conductive area corresponding to the first conductive area, and the position where the DMD is electrically contacted with the circuit board is located in the first conductive area and the second conductive area;

the elastic sheet is provided with a protruding part protruding towards the DMD at a position corresponding to the first conductive area and the second conductive area, and in an installation state, the elastic sheet is in contact with the circuit board through the protruding part and presses the circuit board and the DMD onto the optical case.

3. The projection light engine of claim 2, wherein: the elastic sheet is a metal sheet, the protruding part is a plurality of convex strips formed by bending the plate-shaped body, and the elastic sheet is in line contact with the circuit board through the convex strips.

4. The light engine of claim 1, wherein: the elastic sheet comprises a first plate body, a first convex strip, a second plate body, a second convex strip and a third plate body, and in a natural state, the first plate body, the second plate body and the third plate body are positioned in the same plane, and the second plate body is positioned between the first plate body and the third plate body; the first plate body is connected with the second plate body through the first convex strip, and the second plate body is connected with the third plate body through the second convex strip; the cross sections of the first protruding strips and the second protruding strips in the direction perpendicular to the extending direction of the first protruding strips and the second protruding strips are V-like.

5. The projection light engine of claim 4, wherein: the elastic sheet is a plate-shaped body made of metal materials and can generate elastic deformation when being stressed.

6. The light engine of claim 4, wherein: the sealing piece is arranged between the first protruding strip and the second protruding strip, the pressure part of the circuit board is directly exerted on the circuit board by the elastic piece, and the part of the pressure part is exerted on the circuit board by the sealing piece.

7. The projection light engine of claim 1, wherein: the projection optical machine comprises a first fixing structure, the first fixing structure comprises an installation part, installation holes distributed on the edge of an elastic sheet and located in a plurality of different directions, and installation columns located on the optical machine shell and corresponding to the installation holes, and the installation part penetrates through the installation holes and is fixed on the installation columns to realize the fixation between the elastic sheet and the optical machine shell.

8. The light engine of claim 1, wherein: the sealing member has a sealing and buffering function, and is compressed between the optical enclosure and the circuit board.

9. The projection engine of any of claims 1-8, wherein: the side, far away from the DMD, of the elastic sheet is provided with a heat dissipation assembly fixed with the optical machine shell, the heat dissipation assembly comprises a heat dissipation main body and a heat conduction column, the heat conduction column is fixed to the side, near the DMD, of the heat dissipation main body, the heat conduction column penetrates through the elastic sheet, the sealing sheet and the circuit board to be in contact with the DMD, and at least part of heat generated by the operation of the DMD is transmitted to the heat dissipation main body through the heat conduction column; in the installation state, the side of the heat dissipation main body close to the DMD is spaced from the elastic sheet.

10. A projection device comprising a housing, characterized in that: the projection device further comprises the light engine of any of claims 1-9, the light engine being mounted in the housing.