CN114077124A

CN114077124A - Projection optical machine and projection device

Info

Publication number: CN114077124A
Application number: CN202110875485.9A
Authority: CN
Inventors: 孙峰; 王源; 朱青; 王中俭
Original assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Current assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-02-22
Anticipated expiration: 2041-07-30

Abstract

The invention provides a projection optical machine, which comprises a shell, and a DMD, a heat conducting piece, a pressing piece, a sealing piece, a circuit board, a buffer piece and a radiator which are sequentially stacked, wherein the DMD is fixed on the shell; the heat conducting piece, the pressing piece and the sealing piece are all provided with skylights, so that a first connecting structure arranged on the circuit board can be spliced with a second connecting structure arranged on the DMD to realize the electrical connection between the circuit board and the DMD; the heat radiator comprises a base body and an extension portion, the extension portion is integrally formed on the edge portion of the base body and protrudes towards the direction of the DMD, the surface of the extension portion, close to the DMD, is in surface contact with the surface of the pressing piece, far away from the DMD, and a heat dissipation channel is formed among the DMD, the heat conducting piece, the pressing piece and the heat radiator. The invention also provides a projection device comprising the projection optical machine, and the projection optical machine and the projection device have the advantages of good heat dissipation effect and the like.

Description

Projection optical machine and projection device

Technical Field

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

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 DMD is apt to generate heat during operation, and if the heat generated by the DMD cannot be dissipated, the DMD will affect the working quality of the projector and the product life. Therefore, a reasonably designed heat dissipation structure is very important for the projector.

Disclosure of Invention

In view of the above situation, the present invention is directed to a projector and a projection apparatus.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the projection optical machine comprises a shell, a DMD (digital mirror device), a heat conducting piece, a pressing piece, a sealing piece, a circuit board, a buffer piece and a radiator, wherein the DMD, the heat conducting piece, the pressing piece, the sealing piece, the circuit board, the buffer piece and the radiator are sequentially stacked, and the DMD is fixed on the shell; the heat conducting piece, the pressing piece and the sealing piece are all provided with skylights, so that a first connecting structure arranged on the circuit board can be spliced with a second connecting structure arranged on the DMD to realize the electrical connection between the circuit board and the DMD; the heat radiator comprises a base body and an extension portion, the extension portion is integrally formed on the edge portion of the base body and protrudes towards the direction of the DMD, the surface of the extension portion, close to the DMD, is in surface contact with the surface of the pressing piece, far away from the DMD, and a heat dissipation channel is formed among the DMD, the heat conducting piece, the pressing piece and the heat radiator.

Preferably, the extension comprises a post and/or a rib.

Preferably, the extension portion includes a protruding strip disposed along the bottom of the base, and the circuit board is mounted on the protruding strip.

Preferably, the extension part comprises at least two convex columns positioned at the top of the base body, and the top of the circuit board is higher than the top of the base body and positioned between the two convex columns; and a fixing hole for fixing the radiator on the shell is arranged between the convex column and the convex strip.

Preferably, the radiator further includes the fin, fin integrated into one piece in the radiator is kept away from the surface of circuit board, the base member is close to the constant head tank has been seted up on the surface of circuit board, the constant head tank with the extension cooperation forms and is used for the location portion of bolster, the degree of depth of location portion is less than the thickness of bolster, the bolster bottom surface supports and leans on the extension, its at least one side by the constant head tank location.

Preferably, the substrate is provided with fixing holes at two opposite ends thereof, the housing is provided with fixing columns corresponding to the fixing holes, and the projection optical engine further comprises a fixing member which penetrates through the fixing holes and is fixedly connected with the fixing columns; the shape and size of the edge of one or more of the heat conducting piece, the pressing piece and the sealing piece are matched with the shape and size of the outer surface of the fixing column so as to realize limit at least partially through at least two fixing columns.

Preferably, the pressing member is provided around the louver with a convex portion that is convex toward the DMD.

Preferably, a first accommodating cavity and a second accommodating cavity are arranged on the shell, the second accommodating cavity is arranged around the first accommodating cavity, the DMD is accommodated in the first accommodating cavity, one part of the heat conducting member is accommodated in the first accommodating cavity, the other part of the heat conducting member is accommodated in the second accommodating cavity, the surface of the DMD close to the pressing member is flush with the inner wall, away from the pressing member, of the second accommodating cavity, and the surface of the heat conducting member, away from the pressing member, is in contact with the inner wall, away from the pressing member, of the second accommodating cavity and the surface of the DMD close to the pressing member; the protruding portion extends into the first accommodating cavity and the second accommodating cavity and presses the DMD in the shell through the heat conducting piece.

Preferably, the housing is provided with an accommodating cavity, the DMD is accommodated in the accommodating cavity, and the pressing member presses the DMD onto the housing by pressing the heat-conducting member.

Preferably, the pressing piece is formed by stamping and/or bending a metal sheet.

Preferably, the top of the pressing piece is provided with a bending part formed by bending, and the bending part covers the top surface of the shell.

Preferably, a through hole is formed in the position, close to the bending part, of the pressing part, and a limiting column corresponding to the through hole is arranged on the shell.

Preferably, at least a pair of fixing positions for fixing the pressing member to the housing is arranged on opposite corners of the pressing member, the housing is provided with a screw hole corresponding to the fixing positions, the projection optical machine further includes a screw, and the pressing member is locked with the housing by the screw passing through the fixing positions and the screw hole; wherein the fixing position is a notch.

The invention also provides a projection device which comprises the projection light machine.

According to the invention, the circuit board of the projection optical machine is electrically connected with the DMD through the insertion of the first connector and the second connector, the heat conducting piece is arranged on one side of the DMD, the pressing piece is arranged between the DMD and the circuit board, the radiator is in surface contact with the pressing piece, and the heat dissipation channel is formed among the DMD, the heat conducting piece, the pressing piece and the radiator.

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 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 a projector according to the present invention.

Fig. 2 is a schematic perspective view of the projector according to the present invention at another viewing angle.

Fig. 3 is an exploded view of the projector according to the present invention.

Fig. 4 is a schematic perspective view of the projector according to the present invention with the DMD component removed.

Fig. 5 is a schematic front view of the projector with the DMD component removed.

Fig. 6 is a schematic perspective view of a DMD and a first connector in a projector according to the present invention.

Fig. 7 is a schematic perspective view of a heat-conducting member in the projector according to the present invention.

Fig. 8 is a schematic front view of a heat-conducting member in the projector according to the present invention.

Fig. 9 is a schematic perspective view of a pressing member in the projector according to the present invention.

Fig. 10 is a perspective view of a pressing member in a projector according to the present invention from another perspective.

Fig. 11 is a schematic perspective view of a sealing member in the projector according to the present invention.

Fig. 12 is a schematic perspective view of a circuit board in a projector according to the present invention.

Fig. 13 is a schematic front view of a circuit board in the projector according to the present invention.

Fig. 14 is a schematic perspective view of a heat sink in the projector according to the present invention.

Fig. 15 is a schematic perspective view of a heat sink in a projector according to another aspect of the present invention.

Reference numerals:

100. a projection light machine; 30. a light source module; 40. a lens module; 10. a DMD component; 12. DMD; 121. a first notch; 13. a heat conductive member; 131. a first louver; 132. a second notch; 14. a compression member; 141. a second louver; 142. a boss portion; 1421. a first surface; 146. a second surface; 143. a bending section; 144. a through hole; 145. a recess; 147. a third notch; 15. a seal member; 151. a third louver; 152. a fourth notch; 16. a circuit board; 17. a buffer member; 18. a heat sink; 181. a substrate; 1811. a positioning part; 1812. positioning a groove; 182. a heat sink; 183. an extension portion; 1831. a convex column; 1832. a convex strip; 184. a fixing hole; 19a, a first connector; 19b, a second connector; 20. a housing; 21. a first accommodating chamber; 22. a second accommodating chamber; 23. a limiting column; 24. fixing a column; 241. mounting holes; 25. screw holes.

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 and fig. 2, the present invention provides a projection optical apparatus 100 for projecting an image onto a projection surface such as a curtain or a wall. The projection optical machine includes a DMD assembly 10, a housing 20, a light source module 30, an optical adjustment module (not numbered) and a lens module 40, wherein the DMD assembly 10, the light source module 30 and the lens module 40 are all installed on three different positions of the housing 20, and the optical adjustment module is installed in the housing 20. The light source module 30 includes components including, but not limited to, one or more of a red light source, a blue light source, a green light source, a collimating lens, a converging lens, and a 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. The lens module 40 may be provided with an optical element for optical processing. Light emitted by the light source module 30 is optically adjusted by the optical adjustment module, then is imaged by the DMD assembly 10, and is projected onto the projection surface from the lens module 40.

Referring to fig. 3, the DMD assembly 10 is mounted on one side of the housing 20, the DMD assembly 10 includes a DMD12, a heat conducting element 13, a pressing element 14, a sealing element 15, a circuit board 16, a buffering element 17 and a heat sink 18, which are stacked in sequence from the direction close to the housing 20 to the direction far from the housing 20, and the DMD12 is fixed on the housing 20. For convenience of description, the arrangement direction of each element in the DMD assembly 10 (from close to the housing 20 to far from the housing 20) is defined as the X direction.

Referring to fig. 4 and 5, the housing 20 is provided with a receiving cavity, specifically, the receiving cavity includes a first receiving cavity 21 and a second receiving cavity 22 that are communicated with each other, the second receiving cavity 22 is disposed around the first receiving cavity 21, and a depth (in the X direction) of the first receiving cavity 21 is greater than a depth of the second receiving cavity 22. The outline of the first accommodating chamber 21 is matched with the shape and size of the DMD12, and the DMD12 is accommodated in the first accommodating chamber 21. The heat conduction member 13 is located in the second accommodation chamber 22 and the outer peripheral shape and size of the heat conduction member 13 match the shape and size of the outline of the second accommodation chamber 22, and a part of the heat conduction member 13 is accommodated in the first accommodation chamber 21 and the other part is accommodated in the second accommodation chamber 22. When the DMD12 is accommodated in the first accommodating cavity 21, the surface of the DMD12 close to the pressing member 14 and the surface of the second accommodating cavity 22 far from the inner wall a of the pressing member 14 are flush, and the surface of the heat-conducting member 13 far from the pressing member 14 is in contact with the inner wall a of the second accommodating cavity far from the pressing member 14 and the surface of the DMD12 close to the pressing member 14. The thickness of the heat-conducting member 13 is smaller than the depth of the second accommodating chamber 22 in the X direction, i.e., the surface of the heat-conducting member 13 close to the pressing member 14 is at a distance from the surface B of the housing 20. As a modification, the surface of the heat-conducting member 13 close to the pressing member 14 is flush with the surface B of the housing 20 or protrudes in the direction of the pressing member 14 relative to the surface B, the DMD12 is accommodated in the accommodating chamber, and the pressing member 14 presses the DMD12 against the housing 20 by pressing the heat-conducting member 13.

Referring to fig. 4 and 5, the surface B of the housing 20 is provided with a limiting post 23, a fixing post 24 and a screw hole 25, and the limiting post 23 can prevent the circuit board 16 from tilting to cause unstable electrical connection of the DMD 12. That is, the circuit board 16 will abut against the position-limiting pillars 23 when it is tilted, so as to further prevent the circuit board 16 from falling off and affecting the electrical connection. Specifically, the number of the limiting columns 23 in the drawing is 2, and it can be understood that the number of the limiting columns 23 is 2 or more than 2, and the specific number is not particularly limited. The fixed column 24 quantity is 2, sets up respectively in the second both sides that hold the chamber 22 is relative, is provided with mounting hole 241 on the fixed column 24, and the lateral surface that two fixed column 24 are relative is as the lateral wall that first chamber 21 and the second held the chamber 22 simultaneously. The number of screw holes 25 is 2, and the screw holes are provided on opposite corners of the second accommodation chamber 22, respectively. It can be understood that the number of the fixing posts 24 and the screw holes may be more than two, preferably 2, which not only ensures the stability of the installation, but also considers the simplicity of the installation.

Referring to fig. 6, the surface of the DMD12 is provided with a first connector 19a, two opposite ends of the first connector are provided with first notches 121, and the shape, size and position of the first notches 121 correspond to the outer side surfaces of the fixed posts 24, so that when the DMD12 is accommodated in the first accommodating cavity 21, parts of the two fixed posts 24 are just located in the first notches 121, and the DMD12 is limited by the cooperation of the first notches 121 and the fixed posts 24.

Referring to fig. 7 and 8, the heat conducting member 13 is centrally provided with a first louver 131, that is, the heat conducting member 13 is an annular body, and the first louver 131 is used for the first connector 19a installed on the DMD12 to pass through. The outer periphery of the heat conducting member 13 has the same shape and size as the outline of the second accommodating cavity 22, and when the heat conducting member 13 is accommodated in the second accommodating cavity 22, the surface of the heat conducting member also covers the surface of the DMD12, which is favorable for sealing the DMD 12. The heat conducting member 13 may be made of rubber, silicon gel, or other materials, preferably rubber or other soft heat conducting materials, so that the heat conducting member 13 has good heat conducting function and good sealing property, which is beneficial to heat dissipation and sealing of the DMD 12.

The both ends that lead heat 13 is relative are provided with second breach 132, and the shape size of second breach 132 and the lateral surface that sets up position and fixed column 24 all correspond to when making lead heat 13 hold in the second holds chamber 22, two fixed column 24's local just is located second breach 132, lead heat 13 and realize spacingly through second breach 132 and the cooperation of fixed column 24.

As a modification, the structure of the heat conductive member 13 is not limited, and it may be formed not as an annular body but as a plurality of independent heat conductive strips disposed around the DMD 12.

Referring to fig. 9 and 10, a second window 141, a through hole 144 and a fixing position are formed in the center of the pressing member 14, and the second window 141 is used for the first connector to pass through. The number and the positions of the through holes 144 match with the position-limiting posts 23 on the housing 20, and the pressing member 14 penetrates into the through holes 144 through the position-limiting posts 23 to prevent the circuit board 16 from tilting to cause unstable electrical connection of the DMD 12.

The fixing locations for fixing the pressing member 14 to the housing 20 are embodied as notches 145, the notches 145 are provided at opposite corners of the pressing member 14, and the notches 145 are connected with the external space (i.e., not closed holes), and the number and positions of the notches 145 are matched with the screw holes of the housing 20. Screws are threaded through the recesses 145 and into the screw holes to secure the compression member 14 to the housing 20. It is understood that the fixing position may be any other structure that can realize the fixed connection between the pressing member 14 and the housing 20, such as a through hole.

The pressing member 14 is made of a heat conductive material, and preferably, the pressing member 14 is made of a metal sheet. When the pressing member 14 is a metal sheet, after positioning, when a screw is screwed into the screw hole through the notch 145, the pressing member 14 is easily warped, for example, the pressing member 14 is deformed in a direction away from the DMD12, which affects stability of electrical contact between the first connector and another connector (hereinafter, a second connector) mated therewith. In order to overcome this technical problem, as an embodiment, the pressing member 14 is provided with a protruding portion 142 protruding toward the DMD12 around the second louver 141, the protruding portion 142 is located corresponding to the heat-conducting member 13, and when the pressing member 14 is mounted on the housing 20, the protruding portion 142 protrudes into the first accommodating cavity 21 and the second accommodating cavity 22, and presses the heat-conducting member 13 and the DMD12 on the housing 20. The surface of the protrusion 142 close to the DMD12 is a first surface 1421, the surface of the pressing member 14 surrounding the protrusion 142 and close to the DMD12 is a second surface 146, the first surface 1421 contacts with the heat conducting member 13, and the second surface 146 contacts with the surface B (the surface of the housing 20 with the accommodating cavity). The setting of bellying 142 is favorable to strengthening the intensity that compresses tightly piece 14 around second skylight 141 department for compressing tightly piece 14 in the installation, be difficult for taking place deformation and influence the electric connection stability between first connector and its butt joint connector, also be difficult for being heated and take place deformation. The pressing member 14 is made of a metal sheet, and preferably, the protrusion 142 is a protrusion formed by stamping on the surface of the metal sheet, and the height of the protrusion is 0.5-1 mm.

As another embodiment, the edge of the pressing member 14 is bent to form a bent portion 143, and preferably, the pressing member 14 has an L-shape as a whole. The bent portion 143 is formed to enhance the strength of the pressing member 14 and reduce the possibility of deformation of the pressing member 14 under fixed and heated conditions. Preferably, the bent portion 143 is designed on the top of the pressing member 14 (the terms "upper", "lower", "top", "bottom", etc. as used herein refer to relative positions in the designated view, not absolute positions, it is understood that when the drawing is rotated 180 ° in the plane, the relative positions are changed, such as "top" or "bottom"), and the bent portion 143 is bent toward the DMD12, and the bent portion 143 covers a portion of the surface of the housing 20, so as to block light and dust and facilitate installation. Preferably, the through hole is formed on the side of the bending portion 143, so that the deformation of the pressing member 14 caused by the stress variation between the through hole 144 and the stopper column 23 can be effectively prevented.

With reference to fig. 9 and 10, the pressing element 14 is provided with third notches 147 at two opposite ends, and the shape, size and position of the third notches 147 correspond to the outer side surfaces of the fixing posts 24, so that when the pressing element 14 is fixed on the housing 20, parts of the two fixing posts 24 are just located in the third notches 147, and the pressing element 14 is limited by the cooperation of the third notches 147 and the fixing posts 24.

Referring to fig. 11, a third window 151 is provided in the center of the sealing member 15 for passing the first connector 19 a. The both ends that sealing member 15 is relative are provided with fourth breach 152, and the shape size and the lateral surface that sets up the position and fixed column 24 of fourth breach 152 all correspond to make sealing member 15 installation back, two fixed column 24's local just is arranged in fourth breach 152, and sealing member 15 realizes spacingly through fourth breach 152 and the cooperation of fixed column 24.

Referring to fig. 12, the circuit board 16 is used for driving the DMD12 to operate, the circuit board 16 is provided with a second connector 19b on a side surface close to the DMD12, one of the first connector 19a and the second connector 19b is a male connector, and the other is a female connector. The first connector 19a and the second connector 19b are inserted through the first louver 131, the second louver 141, and the third louver 151 to electrically connect the circuit board 16 and the DMD 12. It is understood that the size of the first connector 19a and the second connector 19b in the X direction is not limited as long as the two connectors can be plugged together to achieve electrical connection, and the first connector 19a may be connected through the first louver 131, the second louver 141, the third louver 151 and the rear and the second connector 19b, the second connector 19b may be connected through the first louver 131, the second louver 141, the third louver 151 and the rear and the first connector 19a, or the first connector 19a or the second connector 19b may be plugged through one or more of the first louver 131, the second louver 141 and the third louver 151. The circuit board 16 may be a printed circuit board or FPC.

Referring back to fig. 3, the buffer 17 is disposed between the heat sink 18 and the circuit board 16 for buffering and preventing the heat sink 18 from damaging the circuit board 16. The buffer member 17 may be a sheet, a column, or a ring, and may be made of any material having a buffering function, such as silicone, rubber, or foam. In the present invention, a heat conductive column, specifically, a rubber column or a silica gel column is preferably used.

Referring to fig. 14 and 15, the heat sink 18 includes a base 181, a plurality of fins 182 and an extension 183, the fins 182 and the extension 183 are disposed on two opposite sides of the base 181, and the plurality of fins 182 are disposed on a surface of the base 181 away from the DMD12 at equal intervals. The extending part 183 is integrally formed on the edge of the base 181 and protrudes towards the direction of the DMD12, in an installation state, the surface of the extending part 183 close to the DMD12 is in contact with the surface of the pressing part 14 far away from the DMD12, and a heat dissipation channel is formed among the DMD12, the heat conducting part 13, the pressing part 14 and the heat sink 18, namely, the heat generated by the DMD12 in the work is transferred to the pressing part 14 through the heat conducting part 13, the pressing part 14 transfers the heat to the heat sink 18 in direct contact with the pressing part, so that the heat generated in the work process of the DMD12 is effectively dissipated, and the work temperature of the DMD12 is reduced. Preferably, the surface of the extension part 183 close to the DMD12 is a plane, and the surface of the pressing part 14 contacting with the extension part 183 is a plane, and the two surfaces contact with each other, so that the efficiency of heat conduction is guaranteed.

The extension portion 183 includes a convex column 1831 and a convex strip 1832, and specifically includes two mutually independent convex columns 1831 located at the top of the base 181 on the back of the base 181, and a convex strip 1832 is disposed at the bottom of the base 181. As a modification, the number of the protruding columns 1831 is not limited, and may be set according to a space between the heat sink 18 and the pressing member 14. The convex column 1831 is arranged at the corner of the heat sink 18, which facilitates the heat dissipation and the stability of the product structure. The protruding columns 1831 or the protruding strips 1832 may be omitted, and according to the present invention, only the protruding strips 1832 located at the bottom of the base 181 may be provided, or only the protruding columns 1831 located at a plurality of corners (e.g., 2, 3, or 4) of the heat sink 18 may be provided. The arrangement of the protruding strips 1832 is beneficial to carrying the circuit board 16 on the protruding strips 1832, the protruding strips 1832 can carry the circuit board 16 while playing a role in heat dissipation, the circuit board 16 does not need to additionally design a fixing structure, the structure of a product is simplified, and the production, the manufacturing, the installation and the maintenance are convenient. It is understood that the raised strips 1832 may be replaced by two independent protruding columns 1831, which may also function as a heat conducting and carrying circuit board 16. Further, the circuit board 16 is located between the two studs 1831, the top of which is higher than the top of the base 181 and protrudes freely from the top of the base 181, and the circuit board 16 is fixed in position by the heat sink 18.

As another understanding, post 1831 may be understood as a shorter sized tab 1832, and tab 1832 may be considered as a plurality of integrally formed posts 1831.

With reference to fig. 14 and fig. 15, the base 181 is respectively provided with fixing holes 184 at two opposite ends thereof, the fixing holes 184 are disposed between the protruding columns 1831 and the protruding strips 1832, the positions of the fixing holes 184 correspond to the positions of the mounting holes 241 on the fixing columns 24 on the casing 20, and fixing members (such as bolts, screws, etc.) are installed in the mounting holes 241 through the fixing holes 184 to connect the heat sink 18 and the casing 20.

With reference to fig. 15, a positioning groove 1812 is formed on the surface of the base 181 close to the DMD12, the positioning groove 1812 and the protruding strip 1832 cooperate to form a positioning portion 1811 for positioning the buffering element 17, the depth (dimension in the X direction) of the positioning portion 1811 is smaller than the thickness (dimension in the X direction) of the buffering element 17, the bottom surface of the buffering element 17 abuts against the extending portion 183, and at least one side edge of the buffering element 17 can be positioned by the positioning groove 1812. The positioning groove 1812 is U-shaped to facilitate installation of the buffer 17.

In the present invention, the shape and size of the first notch 121 of the DMD12, the second notch 132 of the heat conducting member 13, the third notch 147 of the pressing member 14, the fourth notch 152 of the sealing member 15, and the edge thereof are matched with the shape and size of the surface opposite to the fixing post 24, so that the same fixing post 24 can be used for the position limitation. It is understood that one or more of the DMD12 or the thermal conductor 13 or the compression member 14 or the sealing member 15 may be provided with other positioning structures instead of the fixing posts 24. The shape of the notch (including the first notch 121, the second notch 132, the third notch 147 and the fourth notch 152) is an arc shape matching the surface of the fixing post 24, and as a modified embodiment, the shape of the notch may be other shapes such as a U shape and a zigzag shape. The shape and size of the edge of one or more of the heat conducting piece 13, the pressing piece 14 and the sealing piece 15 are matched with the shape and size of the outer surface of the fixing column 24 so as to realize the limiting at least partially through the fixing column 24, and other limiting structures can be arranged to assist in completing the limiting.

When the DMD assembly 10 is installed, the DMD12 and the heat conducting element 13 are installed in the accommodating cavity, the DMD12 and the heat conducting element 13 are respectively limited in position in a plane perpendicular to the X direction by the cooperation of the first notch 121 and the second notch 132 with the fixing post 24, and the first connector 19a protrudes relative to the surface of the DMD12 and passes through the first louver 131 and the second louver 141. The position-limiting columns 23 penetrate through the through holes 144 on the pressing member 14, so that the circuit board 16 is prevented from being inclined, and the electrical connection between the first connector 19a and the second connector 19b is not stable. The bending part 143 covers the top surface of the housing 20, the fixing post 24 is partially caught in the third notch 147, the protrusion 142 of the pressing member 14 extends into the accommodating cavity, a screw is screwed into the screw hole through the notch 145, the pressing member 14 is fixed to the housing 20, and the pressing member 14 presses the DMD12 in the housing 20 through the heat conducting member 13. The fourth notch 152 of the sealing element 15 is clamped with the fixed column 24, the sealing element 15 is limited in position in a plane perpendicular to the X direction, the buffer element 17 is positioned in the positioning part 1811, the circuit board 16 is carried on the convex strip 1832, the heat sink 18 provided with the buffer element 17 and the circuit board 16 is buckled to the shell 20, the fixing element penetrates through the fixing hole 184 and is locked in the mounting hole 241 on the fixed column 24, the heat sink 18 and the shell 20 are fixed, the distance between the heat sink 18 and the shell 20 can be adjusted through the fixing element, the distance between the heat sink 18 and the shell 20 enables the surface of the extending part 183 close to the DMD12 to be attached to the surface of the pressing element 14 far away from the DMD12, and the buffer element 17 is compressed. The heat dissipation path of the projection optical engine 100 is formed, and the buffer 17 between the heat sink 18 and the circuit board 16 plays an effective buffering role while ensuring a compact structure, so as to effectively protect the circuit board 16.

The invention further provides a projector, which includes the above-mentioned projection optical machine 100 and a housing (not shown), the projection optical machine 100 is fixed in the housing, the housing is provided with an opening (not shown) corresponding to the lens module 40, and the light projected by the lens module 40 is projected onto a projection surface through the opening.

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 light engine, comprising: the projection optical machine comprises a shell, a DMD (digital mirror device), a heat conducting piece, a pressing piece, a sealing piece, a circuit board, a buffer piece and a radiator, wherein the DMD, the heat conducting piece, the pressing piece, the sealing piece, the circuit board, the buffer piece and the radiator are sequentially stacked, and the DMD is fixed on the shell;

the heat conducting piece, the pressing piece and the sealing piece are all provided with skylights, so that a first connecting structure arranged on the circuit board can be spliced with a second connecting structure arranged on the DMD to realize the electrical connection between the circuit board and the DMD;

the heat radiator comprises a base body and an extension portion, the extension portion is integrally formed on the edge portion of the base body and protrudes towards the direction of the DMD, the surface of the extension portion, close to the DMD, is in surface contact with the surface of the pressing piece, far away from the DMD, and a heat dissipation channel is formed among the DMD, the heat conducting piece, the pressing piece and the heat radiator.

2. The light engine of claim 1, wherein: the extension portion comprises a convex column and/or a convex strip.

3. The light engine of claim 1, wherein: the extension portion includes along the sand grip that the base member bottom set up, the circuit board carries on the sand grip.

4. The light engine of claim 3, wherein: the extension part comprises at least two convex columns positioned at the top of the base body, and the top of the circuit board is higher than the top of the base body and positioned between the two convex columns; and a fixing hole for fixing the radiator on the shell is arranged between the convex column and the convex strip.

5. The light engine of claim 1, wherein: the radiator further comprises radiating fins, wherein the radiating fins are integrally formed on the surface of the circuit board far away from the radiator, the base body is close to the surface of the circuit board, positioning grooves are formed in the surface of the circuit board and matched with the extending parts to form positioning parts used for positioning the buffer parts, the depth of the positioning parts is smaller than the thickness of the buffer parts, the bottom surfaces of the buffer parts abut against the extending parts, and at least one side edge of the buffer parts is positioned by the positioning grooves.

6. The projection engine of any of claims 1-3, 5, wherein: the projection optical machine further comprises a fixing piece, and the fixing piece penetrates through the fixing hole and is fixedly connected with the fixing column; the shape and size of the edge of one or more of the heat conducting piece, the pressing piece and the sealing piece are matched with the shape and size of the outer surface of the fixing column so as to realize limit at least partially through at least two fixing columns.

7. The projection engine of any of claims 1-5, wherein: the pressing piece is provided with a protruding portion protruding towards the DMD around the skylight.

8. The light engine of claim 7, wherein: a first accommodating cavity and a second accommodating cavity are formed in the shell, the second accommodating cavity is arranged around the first accommodating cavity, the DMD is accommodated in the first accommodating cavity, one part of the heat conducting piece is accommodated in the first accommodating cavity, the other part of the heat conducting piece is accommodated in the second accommodating cavity, the surface of the DMD close to the pressing piece is flush with the inner wall, far away from the pressing piece, of the second accommodating cavity, and the surface of the heat conducting piece, far away from the pressing piece, is in contact with the inner wall, far away from the pressing piece, of the second accommodating cavity and the surface of the DMD close to the pressing piece;

the protruding portion extends into the first accommodating cavity and the second accommodating cavity and presses the DMD in the shell through the heat conducting piece.

9. The light engine of claim 7, wherein: the casing is provided with and holds the chamber, and DMD holds and holds in holding the chamber, compress tightly the piece through compressing tightly the heat-conducting piece and then with DMD compresses tightly in on the casing.

10. The light engine of claim 7, wherein: the pressing piece is formed by stamping and/or bending a metal sheet.

11. The projection engine of any of claims 1-5, wherein: the top of the pressing piece is provided with a bending part formed by bending, and the bending part covers the top surface of the shell.

12. The light engine of claim 11, wherein: the shell is provided with a bending part, a through hole is formed in the position, close to the bending part, of the pressing part, and a limiting column corresponding to the through hole is arranged on the shell.

13. The projection engine of any of claims 1-5, wherein: at least a pair of fixing positions for fixing the pressing piece to the shell are arranged on opposite corners of the pressing piece, a screw hole corresponding to the fixing positions is arranged on the shell, the projection optical machine further comprises a screw, and the pressing piece is locked with the shell by penetrating through the fixing positions and the screw hole through the screw; wherein the securing location is a notch.

14. A projection device, characterized by: comprising the projection engine of any of claims 1-13.