CN114706262B

CN114706262B - Projection ray apparatus and projecting apparatus

Info

Publication number: CN114706262B
Application number: CN202111534160.0A
Authority: CN
Inventors: 孙峰; 杨浩; 朱青
Original assignee: Shenzhen Anhua Photoelectric Technology Co ltd
Current assignee: Shenzhen Anhua Photoelectric Technology Co ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2024-01-16
Anticipated expiration: 2041-12-15
Also published as: CN114706262A

Abstract

The invention provides a projection light machine, the upper part of which comprises an upper shell, a prism group, a DMD group and a lens, and the lower part of which comprises a lower shell, an LED light source module, a plurality of lenses, a reflector and a first cover plate; light emitted by the LED light source module is subjected to optical treatment through a plurality of lenses and then reflected by the reflectors, light with changed propagation direction enters the prism group and then irradiates the DMD group, and light reflected by the DMD group again enters the lenses through the prism group to change the propagation direction of the light; the lower shell comprises a first lower shell part and a second lower shell part, a light source cavity is formed in the first lower shell part, the LED light source module is at least partially installed in the light source cavity, a first installation opening is formed in the top of the first lower shell part, a first cover plate covers the first installation opening, and a heat dissipation column is arranged on the top surface of the first cover plate so that heat in the light source cavity is LED out through the heat dissipation column. The invention further provides a projector comprising the projection light machine. The projector and the projector provided by the invention have the advantages of compact volume, good heat dissipation effect and the like.

Description

Projection ray apparatus and projecting apparatus

Technical Field

The present invention relates to the field of projection, and more particularly, to a projection light machine and a projector.

Background

In recent years, DLP (digital light processing) projection light machines using DMD (digital micromirror array) as a spatial modulator have been rapidly developed from tens of lumens to thousands of lumens due to their rich colors, high contrast, and wide output luminance range, which is a great share in the projection market.

In order to obtain a better projection effect, the DLP projection optical machine comprises a light source module, a plurality of lenses (such as fly's eye lenses, spherical lenses and the like), a reflector, a prism, a DMD component, a lens component and the like which are positioned in the same plane, wherein light emitted by the light source module passes through the lenses, then enters the prism after being reflected by the reflector, is refracted by the prism, then is emitted from one light-transmitting surface of the prism to enter the DMD component, and light reflected by the DMD component enters the prism again, and then is emitted from the other light-transmitting surface of the prism to enter the lens component. However, along with the development trend of miniaturization of products and the increasing requirement on projection effect, the existing projection optical machine capable of guaranteeing the projection effect is huge in volume and difficult to meet market demands; under the condition of guaranteeing the projection effect, the volume of the projection optical machine is reduced, so that the heat is easily accumulated in the projection optical machine to cause a new product problem.

Disclosure of Invention

In view of the above-mentioned situation, a main object of the present invention is to provide a compact projector and a projector with good heat dissipation effect.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a projection light machine comprising an upper part and a lower part, wherein the upper part comprises a lens, an upper shell and a second optical processing component arranged in the upper shell, and the lower part comprises a lower shell, an LED light source module, a first optical processing component and a first cover plate; the lower shell comprises a first lower shell part internally provided with a light source cavity and a second lower shell part internally provided with the first optical processing component, wherein the first lower shell part is positioned at one end of the second lower shell part, and the end part of the first lower shell part exceeds the side surface of the second lower shell part; the upper shell is mounted on the top of the second lower shell and is positioned at one end far away from the first lower shell; the lens is connected to the upper shell, and the part of the first lower shell beyond the side surface of the second lower shell is positioned on the same side of the second lower shell as the lens; the first optical processing assembly comprises a plurality of lenses and reflectors which are sequentially arranged, and the reflecting direction of the reflectors faces the second optical processing assembly; the second optical processing component comprises a prism group and a DMD group which are sequentially arranged; light emitted by the LED light source module is optically processed by the lenses and then reflected by the reflectors, light with changed propagation direction enters the prism group and irradiates the DMD group, and light reflected by the DMD group again enters the lenses through the prism group to change the propagation direction of the light; the LED light source module is at least partially installed in the light source cavity, a first installation opening is formed in the top of the first lower shell part, the first installation opening is covered by the first cover plate, and a heat dissipation column is arranged on the top surface of the first cover plate, so that heat in the light source cavity is LED out through the heat dissipation column.

Preferably, the plurality of lenses in the first optical processing assembly include a fly-eye lens, a first lens, and a non-rotationally symmetric lens, which are disposed in sequence; the bottom surface of the second lower shell part is provided with a second mounting port, and the top surface of the second lower shell part is provided with a third mounting port; the first mounting port is arranged corresponding to the mounting position of the light source cavity and the fly-eye lens; the second mounting opening is arranged at least corresponding to the mounting positions of the first lens and the non-rotationally symmetrical lens; the third mounting port is arranged corresponding to the mounting position of the reflector, and the upper shell is mounted at the third mounting port.

Preferably, the projection optical engine further comprises a second cover plate, and the second cover plate is installed on the second lower shell part to cover the second installation opening; the first cover plate and the second cover plate are metal cover plates.

Preferably, in the height direction, the projection of the upper housing coincides with the projection portion of the second mounting opening.

Preferably, the second optical processing assembly further includes a second lens, the second lens is fixed in the upper housing through a black mounting member, and the second lens, the prism group and the DMD group are sequentially disposed on an optical path.

Preferably, in the optical axis direction of the lens, a center vertical plane a of the DMD group is farther from the lens than a center vertical plane B of a surface of the prism group, which is closer to the DMD group.

Preferably, the distance between the central vertical plane a and the central vertical plane B is greater than 0 and less than or equal to 2mm.

Preferably, the first optical processing component comprises a fly-eye lens, a first lens, a non-rotationally symmetrical lens and the reflective mirror which are sequentially arranged; the bottom surface of the lower shell is positioned on a horizontal plane, and the LED light source, the fly-eye lens and the reflector are arranged in a deflection way; the LED light source module comprises a plurality of rectangular LED chips arranged on the side wall of the first lower shell part, the side wall is vertical to a horizontal plane, and an included angle a exists between the short side of the LED chips and the horizontal plane; the fly-eye lens comprises a plurality of rectangular light-transmitting units which are arranged in an array manner, wherein an included angle b exists between the short side of each light-transmitting unit and the horizontal plane; the height direction is a Z-axis direction, the optical axis direction of the lens is an X-direction and is parallel to the horizontal plane, and the Y-direction is perpendicular to the X-direction in the horizontal plane; the reflector is rectangular, and comprises a first long side, a second long side, a first short side and a second short side, wherein the first long side and the second long side are oppositely arranged and are parallel, the first short side and the second short side are oppositely arranged and are parallel, the first long side is farther from the lens than the second long side, the first short side is closer to a horizontal plane and a non-rotationally symmetrical lens than the second short side, one end, connected with the first long side, of the first short side is closer to the DMD group than the other end, opposite to the first short side, of the first short side, the projection of the first long side in a YZ plane is positioned above the projection of the second long side in the YZ plane, and an included angle between a normal line of a reflecting surface of the reflector and the YZ plane is c; wherein a is 10 ° -14 °, a=b=c.

Preferably, a light blocking plate is disposed on a surface of the first cover plate adjacent to the light source cavity, and in an installed state, the light blocking plate blocks light directed to an inner wall of the first lower housing portion.

The invention also provides a projector comprising a housing, the projector comprising a projection light engine as described above, the projection light engine being arranged in the housing.

The projection optical machine provided by the invention is designed into an upper part and a lower part, the second lower shell part internally provided with the first optical component is connected to one side of the first lower shell part provided with the LED light source module, the upper shell body provided with the second optical component is arranged at the top of the second lower shell part and is positioned at one end far away from the first lower shell part, the lens is connected to the upper shell body, one end of the first lower shell part close to the lens is positioned at the same side of the second lower shell part as the lens, and the whole projection optical machine is compact in structure and small in volume. Light enters the shell from the second lower shell part and then enters the lens, the trend of the light path is special, and the light path optimization effect is good while the size is small. The LED light source module can provide high-power illumination in products with small volumes, so that higher and higher user demands are met; be provided with the heat dissipation post on the first apron, the heat in the light source chamber can be derived through the heat dissipation post, and the heat dissipation post sets up at the top of first apron, and it has improved the heat dispersion of product under the condition that does not increase product height, has solved the heat dissipation problem of small-size product.

Other advantages of the present invention will be set forth in the description of specific technical features and solutions, by which those skilled in the art should understand the advantages that the technical features and solutions bring.

Drawings

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

fig. 1 and fig. 2 are schematic perspective views of a projection optical machine according to an embodiment of the invention at different angles.

Fig. 3 is a front view of a projector according to an embodiment of the invention.

Fig. 4 is a top view of an LED light source module, a first optical processing assembly, and a second optical processing assembly in a projector according to an embodiment of the invention.

Fig. 5 is an enlarged schematic view of the structure at P in fig. 3.

Fig. 6 is a front view of an LED light source module, a first optical processing assembly, and a second optical processing assembly in a projector according to an embodiment of the invention.

Fig. 7 is a schematic view of a structure of a fly-eye lens in a Y direction in a projector according to an embodiment of the invention.

Fig. 8 is a right side view of an LED light source module, a first optical processing assembly, and a second optical processing assembly in a projector according to an embodiment of the invention.

Fig. 9 is an enlarged schematic view of the structure at Q in fig. 8.

Fig. 10 is a bottom view of a housing in a projector according to an embodiment of the invention.

Fig. 11 is a right side view of the prism assembly and the second lens in the projection optical engine according to the embodiment of the invention.

Fig. 12 is a schematic perspective view of a black mounting member in a projection optical engine according to an embodiment of the invention.

Fig. 13 and 14 are schematic perspective views of an optical chassis of a projector according to an embodiment of the invention.

Fig. 15 is an exploded view of a projection light engine according to an embodiment of the invention.

Fig. 16 is a schematic perspective view of a first cover plate in a projector according to an embodiment of the invention.

Fig. 17 is a schematic diagram of another exploded structure of the projection light engine according to the embodiment of the invention.

Fig. 18 is a schematic perspective view of a housing in a projector according to an embodiment of the invention.

Fig. 19 is a rear view of a housing in a projector according to an embodiment of the invention.

Reference numerals:

10. a projection light machine; 11. an LED light source module; 111. a light emitting unit; 113. an optical processing element; 1131. a first beam splitter; 1132. a second light splitting sheet; 13. a first optical processing component; 131. a fly-eye lens; 1311. a light transmitting unit; 133. a first lens; 135. a non-rotationally symmetric lens; 137. a reflective mirror; 15. a second optical processing component; 151. a second lens; 1510. a black mount; 1511. a receiving location; 1513. a through hole; 153. a prism group; 1531. a first prism; 1533. a second prism; 155. a DMD group; 17. a lens assembly; 12. a lower housing; 120a, a first cover plate; 1201. a heat radiation column; 1202. a light barrier; 120b, a second cover plate; 121. a first mounting port; 122. a second mounting port; 123. a third mounting port; 121. a first lower shell portion; 122. a second lower shell portion; 14. an upper housing; 141. a first opening; 142. a second opening; 143. a third opening; 144. a sidewall; 16. and a lens.

Detailed Description

The present invention is 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 present invention, and in order to avoid obscuring the present invention, well-known methods, procedures, flows, and components are not presented in detail.

Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings 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, it is the meaning of "including but not limited to".

In the description of the present invention, it should 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. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

Referring to fig. 1 to 3, an embodiment of the present invention provides a projector 10, which is placed or fixed on a supporting surface (e.g. a desktop, a wall surface, etc.), and projects an image on a display screen or a wall surface.

As shown in fig. 3, when the projection light machine 10 is placed on the supporting surface, an end close to the supporting surface is defined as "lower", an end far from the supporting surface is defined as "upper", the projection light machine 10 includes an upper portion and a lower portion, and a vertical projection of the upper portion on the supporting surface coincides with a vertical projection of the lower portion on the supporting surface.

Referring to fig. 4 and 5, the projection light machine 10 includes an LED light source module 11, a first optical processing unit 13, a second optical processing unit 15, and a lens 17 (the external structure of the lens in fig. 4 is omitted), wherein the LED light source module 11 and the first optical processing unit 13 are located at a lower portion, and the second optical processing unit 15 and the lens 17 are located at an upper portion. The light emitted by the LED light source module 11 enters the lens 17 after being optically processed by the first optical processing component 13 and the second optical processing component 15, and the light is projected onto a display screen or a wall surface after being optically processed again by the lens 17.

With continued reference to fig. 1 and 3, the projection light engine 10 includes a lower housing 12, an upper housing 14 and a lens 17, the lower housing 12 is located at a lower portion of the projection light engine 10, the lower housing 12 includes a first lower housing portion 121 and a second lower housing portion 122, the second lower housing portion 122 is located at one side of the first lower housing portion 121, and the first lower housing portion 121 is located at an end of the second lower housing portion 122. It will be understood that being located on one side of the component, i.e. on the long side of the component, is referred to as being "located at the end of the component" if the component is located on the wide side thereof; the faces of the long side and the wide side/high are the side faces, and the faces of the wide side and the high are the end faces. The upper housing 14 is mounted on top of the second lower housing portion 122 and is located at an end remote from the first lower housing portion 121; the lens 17 is connected to the upper housing 14, and an end of the first lower housing portion 121, which is close to the lens 17, is located on the same side of the second lower housing portion 122 as the lens 17.

As one example, the lower housing 12 is L-shaped. The upper housing 14 and the lens 17 are located at an upper portion of the housing of the projector 10 and are at the same or substantially the same height relative to the support surface. In the present invention, when the projection light engine 10 is placed on the supporting surface, the bottom surface of the lower housing 12 contacts the supporting surface.

Inside the first lower case portion 121 is a first space (light source cavity), inside the second lower case portion 122 is a second space, the LED light source module 11 is partially mounted in the first space, the first optical processing assembly 13 is mounted in the second space, and the second optical processing assembly 15 is mounted in the upper case 14.

For convenience of description, the bottom surface of the lower case 12 is defined as a horizontal plane, a direction perpendicular to the horizontal plane is a Z-axis direction, an optical axis direction of the lens 17 is an X-direction and parallel to the horizontal plane, and in the horizontal plane, a Y-direction is perpendicular to the X-direction. The XYZ direction is constructed into a three-dimensional space rectangular coordinate system.

Referring to fig. 3, 4 and 5, the led light source module 11 includes a light emitting unit 111 and an optical processing element 113, the light emitting unit 111 is fixed on a sidewall of the first lower housing part 121, and adjacent sidewalls of the first lower housing part 121 are parallel to an XZ plane and a YZ plane, respectively. The light emitting unit 111 is rectangular, the light emitting unit 111 is deflected, the deflection angle of the light emitting unit 111 is a, as an embodiment, a is not less than 5 degrees and not more than 43 degrees, it is understood that the deflection setting of the light emitting unit 111 is that an included angle a exists between the edge (short side a 1) of the bottom of the light emitting unit 111 and the horizontal plane, and a is more than 0 degrees and less than 43 degrees, more preferably 10 degrees to 14 degrees, still more preferably 12 degrees. It is understood that the light emitting unit 111 may be rectangular or square, and when it is square, the edge of the bottom thereof is called a short side.

The light emitting unit 111 in this embodiment is an LED chip, which is fixed to a side wall of the first lower case 121 by a carrier plate or the like. The LED chip can specifically comprise a red light source, a green light source, a blue light source and a PB light source, wherein the PB light source irradiates the green light source, and the green light source is excited to emit more green light. In this embodiment, the LED chips include red and green light sources, a blue light source, and a PB light source, wherein four LED chips are disposed on the sidewalls of the first lower case portion 121 in three different orientations. As a known method, a light emitting surface of a conventional LED chip is rectangular, and is generally rectangular.

With continued reference to fig. 4, the optical processing element 113 at least includes a first light splitting sheet 1131 and a second light splitting sheet 1132, wherein light emitting units are disposed on two sides of the first light splitting sheet 1131, and two light emitting units are disposed on one side of the second light splitting sheet 1132.

Referring to fig. 6 and 7, the first optical processing device 13 includes one or more lenses and a reflective mirror arranged along a first direction (i.e. Y direction), and in this embodiment, the first optical processing device 13 includes a fly-eye lens 131, a first lens 133, a non-rotationally symmetrical lens 135 and a reflective mirror 137. The fly-eye lens 131 is deflected at an angle b, a=b, and the fly-eye lens 131 includes a plurality of rectangular transparent units 1311 arranged in an array, and it is understood that the fly-eye lens 131 is deflected such that an included angle b exists between the bottom edge (the short side b1 of the rectangle) of each transparent unit 1311 and the horizontal plane, and the included angle is greater than 0 ° and less than 43 °, preferably 10 ° -14 °.

The non-rotationally symmetrical lens 135 includes a first surface and a second surface opposite to each other in the Y direction, the first surface and the second surface are free-form smooth curved surfaces, the first surface and the second surface are non-rotationally symmetrical curved surfaces, and the design of the non-rotationally symmetrical lens aims to reduce the number of lenses in the first optical processing component 13 while optimizing the optical path, simplify the structure of the first optical processing component 13, and reduce the product volume. In the present invention, the non-rotationally symmetrical lens 135 and the mirror 137 are disposed directly below the upper case 14.

In the present embodiment, the lenses in the first optical processing component 13 include the fly-eye lens 131, the first lens 133 and the non-rotationally symmetrical lens 135, and through the mutual cooperation between them, the optical processing requirements of the projection optical machine 10 are satisfied, the number of lenses is simplified, the installation complexity is reduced, and the product size is reduced.

Referring to fig. 6 and 8, the mirror 137 in the first optical processing unit 13 is also deflected. The mirror 137 is approximately rectangular (in order to reduce the height of the projection optics 10 on the Z-axis, a corner of the rectangular mirror near the horizontal plane is cut off to form a rectangle-like shape, the rectangle-like shape refers to a shape of which the outer contour is rectangular or approximately rectangular, and specifically includes a first long side c1 and a second long side c2 which are oppositely disposed and parallel to each other, wherein the first long side c1 is farther from the lens 17 than the second long side c2, the mirror 137 further includes a first short side c3 and a second short side c4 which are oppositely disposed and parallel to each other, wherein the first short side c3 is closer to the horizontal plane and the rotationally symmetrical lens 135 than the second short side c4, and it is understood that the mirror 137 is deflected, that is, the projections of the first long side c1 and the second long side c2 in the YZ plane are parallel to each other but do not coincide, and the projection of the first long side c1 is above the projection of the second long side c2 (that is closer to the group 155 than the second long side c 2), the first short side c3 is closer to the group 155 than the second long side c2 is to the opposite end of the DMD (the opposite end of the DMD assembly 155 is found to be the optical plane = the second plane of the mirror assembly of the mirror 137 a = the second plane). The reflecting surface forms a non-zero angle with the XYZ axes. The light reflected by the reflecting mirror 137 is emitted in a direction not perpendicular to the horizontal plane.

Referring to fig. 8 and 9, the second optical processing element 15 is at least partially located directly above the first optical processing element 13, and the second optical processing element 15 includes a prism group 153 and a DMD group 155 arranged along a second direction, and an angle is formed between the second direction and the Z-axis. In this embodiment, in order to optimize the light efficiency, the second optical processing assembly 15 includes a second lens 151, the second lens 151, a prism set 153 and a DMD set 155 are sequentially arranged along the second direction, and since the light emitting unit 111, the fly eye lens 131, the non-rotationally symmetrical lens 135 and the reflective mirror 137 in the LED light source module 11 are all deflected, the second lens 151 is configured to symmetrically process the light entering the DMD set 155.

The prism group 153 includes a first prism 1531 and a second prism 1533, the second prism 1533 having a smaller size than the first prism 1531, the first prism 1531 being located between the second prism 1533 and the DMD group 155, the second prism 1533 being fixed on one surface of the first prism 1531.

With continued reference to fig. 9, the DMD set 155 is disposed parallel to a horizontal plane, and as an embodiment, the surfaces of the DMD set 155 and the prism set 153 opposite to each other are rectangular and parallel to the horizontal plane, and the long sides and the short sides of the DMD set 155 and the prism set 153 are parallel to each other. The DMD group 155 is disposed offset from the prism group 153, specifically, in the X direction, a center vertical plane a of the DMD group 155 and a center vertical plane B of the prism group 153 near the surface of the DMD group 155 are both perpendicular to the X direction (i.e., the optical axis direction of the projection lens), and the center vertical plane a is farther from the lens 17 than the center vertical plane B. In the direction of the optical axis, the central vertical plane of the DMD group 155 is a plane passing through the midpoints of four edges of the DMD group parallel to the optical axis. The surface of the prism group 153 near the plane of the DMD group 155 is an M-plane, and in the direction of the optical axis, the center vertical surface of the prism group 153 is a plane perpendicular to the M-plane and passing through the midpoints of two edges of the plane parallel to the optical axis. The central vertical plane A, B is perpendicular to the optical axis of the projection lens.

The DMD group 155 moves left in the center, which increases the installation space for the right component, for example, to facilitate the installation of the galvanometer assembly in the lens 17. After the DMD group 155 is offset, the dimension of the prism group 153 at the center vertical plane a is smaller than the dimension of the prism group 153 at the center vertical plane B in the Z-axis direction, and the optical device located on the upstream side of the prism group 153 in the optical path can also be closer to the DMD group 155 by the offset arrangement, so that the height of the entire projector 10 in the Z-axis direction can be reduced, thereby facilitating the miniaturization development of the entire projector 10. On the other hand, due to the offset arrangement of the DMD group 155, the path of the light beam entering the DMD group 155 through the prism group 153 is shortened, so that the design difficulty of the whole optical system can be reduced, and the cost can be reduced; and the offset arrangement of the DMD group 155, relative to the design where the central vertical plane A, B coincides, facilitates the installation of the lens 17.

The distance between the central vertical plane A and the central vertical plane B is d, the d value is more than 0 and less than 2mm, such as 0.5mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.5mm and the like, and further preferably, the distance between the central vertical plane A and the central vertical plane B is 1mm. With this arrangement, the gap between the prism group 153 and the lens 17 is appropriate, facilitating the installation of the lens 17.

Referring to fig. 10 to 12, the second lens 151 is a spherical lens fixed in the inner space of the upper case 14 by a black mount 1510. An included angle exists between the central axis R and the Z axis of the second lens 151, and an end of the second lens 151 distant from the lens 17 is closer to the DMD group 155 than an end close to the lens 17, i.e., the second lens 151 is mounted in the upper case 14 in an inclined manner. As shown in fig. 11, since the DMD group 155 and the prism group 153 are offset, light irradiated in the S region cannot enter the DMD group 155, in order that light emitted from the second lens 151 can effectively enter the DMD group 155, the outer shape of the black mount 1510 is matched with the shape of the inner space of the upper case 14 to be conveniently fixed in the inner space of the upper case 14, the black mount 1510 is provided with a receiving position 1511, the outline of the receiving position 1511 is circular to be matched with the outer shape of the second lens 151, and the second lens 151 is mounted in the receiving position 1511 and fixed by an adhesive. Through holes 1513 are formed in the corresponding positions of the accommodating positions 1511, the through holes 1513 are matched with the prism groups 153 and the DMD groups 155 in shape and size, the through holes 1513 are rectangular, light entering the second lens 151 can only be emitted to the prism groups 153 from the through holes 1513, and light at positions other than the through holes 1513 is blocked by the black mounting piece 1510, so that stray light and the like are prevented from entering the prism groups 153, and light efficiency is prevented from being influenced.

With continued reference to fig. 8, the lens 17 and the second optical processing unit 15 are located at the same height, and the interior of the lens 17 includes, but is not limited to, optical elements such as a galvanometer in a third direction (i.e. X direction/optical axis direction), a third lens, and a fourth lens.

It will be appreciated that the first direction is perpendicular to the second and third directions, and that the second and third directions are not perpendicular to each other. The light emitted by the LED light source module 11 is optically processed by the first optical processing component 13 and reflected by the reflector 137, and then enters the prism group 153 to be irradiated to the DMD group 155, and the light reflected by the DMD group 155 again enters the lens 17 after changing the light propagation direction by the prism group 153.

Referring to fig. 13 and 14, a first mounting opening 121 is formed on the top surface of the first lower casing portion 121, a light source cavity inside the first lower casing portion 121 can be communicated with the outside through the first mounting opening 121, a third mounting opening 123 is formed on the top surface of the second lower casing portion 122, a second mounting opening 122 is formed on the bottom surface of the second lower casing portion 122, the first mounting opening 121 is arranged corresponding to the positions of the light source cavity and the fly eye lens 131, or the positions of the light source cavity, in the present invention, the first mounting opening 121 is arranged corresponding to the positions of the light source cavity and the fly eye lens 131, and the LED light source module 11 is mounted in the first space through the first mounting opening 121. The second mounting opening 122 is provided at least corresponding to the mounting positions of the first lens 133 and the non-rotationally symmetrical lens 135 in the first optical processing unit 13, and the first lens 133 and the non-rotationally symmetrical lens 135 are mounted in the lower housing 12 through the second mounting opening 122. The third mounting port 123 is provided corresponding to the position of the mirror 137 in the first optical processing module 13, that is, the mirror 137 is mounted in the lower housing 12 through the third mounting port 123.

The upper case 14 is mounted at the third mounting port 123. In the height direction, the projection of the upper case 14 coincides with the projection portion of the second mounting opening 122. The second lens 151, the prism group 153 and the DMD group 155 are sequentially disposed on the optical path, and the projection in the height direction at least partially coincides with the projection of the third mounting opening 123.

Referring to fig. 15 to 17, the projector 10 includes a first cover plate 120a, the first cover plate 120a is fixedly mounted on the lower housing 12 to close the first mounting opening 121, a plurality of heat dissipation columns 1201 are disposed on a top surface of the first cover plate 120a, and a light blocking plate 1202 is disposed on a surface of the first cover plate 120a close to the LED light source module 11, and in a mounted state, the light blocking plate 1202 blocks light emitted to an inner wall of the first lower housing 121 to prevent burning. As an example, the light blocking plate 1202 is disposed on a side of the first light splitting sheet 131 near the lens, and blocks an inner wall of the side first lower case portion 121. As another embodiment, the light barrier 1202 may also guide the installation of the first cover plate 120 a. The projector 10 further includes a second cover plate 120b, and the second cover plate 120b is fixedly mounted on the lower housing 12 to close the second mounting opening 122.

In this embodiment, the lower housing 12 is a plastic housing, and the first cover 120a and/or the second cover 120b are metal covers. The first cover plate 120a is a metal cover plate, on which the heat dissipation post 1201 is integrally formed, and heat in the first space can be rapidly conducted out through the first cover plate 120a, so that the performance of the projection optical machine 10 is prevented from being affected by excessive temperature. A light blocking plate 1202 is provided on a surface of the first cover plate 120a adjacent to the LED light source module 11 to guide the installation of the first cover plate 120 a. The bottom and the top of the lower shell 12 are respectively provided with a mounting opening, and the corresponding mounting opening of the LED light source module 11 is arranged on the top surface of the lower shell, so that the LED light source module 11 is convenient to mount and maintain. The structural design of the projector 10 is compact, most of the top surface of the lower housing 12 corresponding to the first optical processing component 13 is blocked by the upper housing 14, and in this embodiment, the mounting openings of the first lens 133 and the non-rotationally symmetrical lens 135 are skillfully arranged on the bottom surface of the lower housing 12, so that the mounting problem is solved while the product size is not increased.

Referring to fig. 10, 18 and 19, the projector 10 further includes an upper housing 14, a first opening 141 and a second opening 142 are respectively disposed at the bottom and top of the upper housing 14, a third opening 143 is disposed near the lens 17, the first opening 141 and the third mounting opening 123 are in butt joint, the DMD group 155 is mounted at the second opening 142, and the lens 17 is mounted at the third opening 143. The top of the DMD set 155 is provided with a radiator, and the side wall 144 connected to the top surface is provided with a radiator or a radiating structure, as an embodiment, the radiator is partially located inside the upper housing 14, and partially located on the outer wall of the upper housing 14, and the heat inside the upper housing 14 is led out by the radiator and is radiated in the external space.

The invention also provides a projector comprising a housing, the projector comprising a projection light engine 10 as described above, the projection light engine 10 being arranged in the housing.

Those skilled in the art will appreciate that the above-described preferred embodiments can be freely combined and stacked without conflict.

It will be understood that the above-described embodiments are merely illustrative and not restrictive, and that all obvious or equivalent modifications and substitutions to the details given above may be made by those skilled in the art without departing from the underlying principles of the invention, are intended to be included within the scope of the appended claims.

Claims

1. A projection light engine, characterized by: the projection light machine comprises an upper part and a lower part, wherein the upper part comprises a lens, an upper shell and a second optical processing assembly arranged in the upper shell, and the lower part comprises a lower shell, an LED light source module, a first optical processing assembly and a first cover plate;

the lower shell comprises a first lower shell part internally provided with a light source cavity and a second lower shell part internally provided with the first optical processing component, wherein the first lower shell part is positioned at one end of the second lower shell part, and the end part of the first lower shell part exceeds the side surface of the second lower shell part; the upper shell is mounted on the top of the second lower shell and is positioned at one end far away from the first lower shell; the lens is connected to the upper shell, and the part of the first lower shell beyond the side surface of the second lower shell is positioned on the same side of the second lower shell as the lens;

the first optical processing assembly comprises a plurality of lenses and reflectors which are sequentially arranged, and the reflecting direction of the reflectors faces the second optical processing assembly; the second optical processing component comprises a prism group and a DMD group which are sequentially arranged;

light emitted by the LED light source module is optically processed by the lenses and then reflected by the reflectors, light with changed propagation direction enters the prism group and irradiates the DMD group, and light reflected by the DMD group again enters the lenses through the prism group to change the propagation direction of the light;

the LED light source module is at least partially installed in the light source cavity, a first installation opening is formed in the top of the first lower shell part, the first installation opening is covered by the first cover plate, and a heat dissipation column is arranged on the top surface of the first cover plate, so that heat in the light source cavity is LED out through the heat dissipation column.

2. The projection light engine of claim 1, wherein: the plurality of lenses in the first optical processing assembly comprise a fly-eye lens, a first lens and a non-rotationally symmetrical lens which are sequentially arranged; the bottom surface of the second lower shell part is provided with a second mounting port _， The top surface of the box body is provided with a third mounting port;

the first mounting port is arranged corresponding to the mounting position of the light source cavity and the fly-eye lens;

the second mounting opening is arranged at least corresponding to the mounting positions of the first lens and the non-rotationally symmetrical lens;

the third mounting port is arranged corresponding to the mounting position of the reflector, and the upper shell is mounted at the third mounting port.

3. The projection light engine of claim 2, wherein: the projection optical engine further comprises a second cover plate, wherein the second cover plate is arranged on the second lower shell part so as to cover the second mounting opening;

the first cover plate and the second cover plate are metal cover plates.

4. The projection light engine of claim 2, wherein: in the height direction, the projection of the upper shell is overlapped with the projection part of the second mounting opening.

5. The projection light engine of claim 1, wherein: the second optical processing assembly further comprises a second lens, the second lens is fixed in the upper shell through a black mounting piece, and the second lens, the prism group and the DMD group are sequentially arranged on an optical path.

6. The projection light engine of claim 1, wherein:

in the optical axis direction of the lens, a center vertical plane A of the DMD group is farther from the lens than a center vertical plane B of a surface of the prism group, which is closer to the DMD group.

7. The projection light engine of claim 6, wherein: the distance between the center vertical plane A and the center vertical plane B is more than 0 and less than or equal to 2mm.

8. The projection light engine of claim 2, wherein: the bottom surface of the lower shell is positioned on a horizontal plane, and the LED light source, the fly-eye lens and the reflector are arranged in a deflection way;

the LED light source module comprises a plurality of rectangular LED chips arranged on the side wall of the first lower shell part, the side wall is vertical to a horizontal plane, and an included angle a exists between the short side of the LED chips and the horizontal plane;

the fly-eye lens comprises a plurality of rectangular light-transmitting units which are arranged in an array manner, wherein an included angle b exists between the short side of each light-transmitting unit and the horizontal plane;

the height direction is a Z-axis direction, the optical axis direction of the lens is an X-direction and is parallel to the horizontal plane, and the Y-direction is perpendicular to the X-direction in the horizontal plane;

the reflector is rectangular, and comprises a first long side, a second long side, a first short side and a second short side, wherein the first long side and the second long side are oppositely arranged and are parallel, the first short side and the second short side are oppositely arranged and are parallel, the first long side is farther from the lens than the second long side, the first short side is closer to a horizontal plane and a non-rotationally symmetrical lens than the second short side, one end, connected with the first long side, of the first short side is closer to the DMD group than the other end, opposite to the first short side, of the first short side, the projection of the first long side in a YZ plane is positioned above the projection of the second long side in the YZ plane, and an included angle between a normal line of a reflecting surface of the reflector and the YZ plane is c;

wherein a is 10 ° -14 °, a=b=c.

9. The projection light engine of claim 1, wherein: the first cover plate is provided with a light barrier on the surface close to the light source cavity, and in the installation state, the light barrier shields light emitted to the inner wall of the first lower shell.

10. A projector, comprising a housing, characterized in that: the projector further comprising a projection light engine according to any of claims 1-9, the projection light engine being disposed within the housing.