CN114706262A

CN114706262A - Projection optical machine and projector

Info

Publication number: CN114706262A
Application number: CN202111534160.0A
Authority: CN
Inventors: 孙峰; 杨浩; 朱青
Original assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Current assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-07-05
Anticipated expiration: 2041-12-15
Also published as: CN114706262B

Abstract

The invention provides a projection optical 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 a reflector, the light with the changed propagation direction enters the prism group and then irradiates the DMD group, and the light reflected by the DMD group enters the lens after the propagation direction of the light is changed by the prism group; the lower shell comprises a first lower shell and a second lower shell, a light source cavity is formed in the first lower shell, the LED light source module is at least partially installed in the light source cavity, a first installing opening is formed in the top of the first lower shell, a first cover plate covers the first installing 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 also provides a projector comprising the optical projector. The projection optical machine and the projector provided by the invention have the advantages of compact volume, good heat dissipation effect and the like.

Description

Projection optical machine and projector

Technical Field

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

Background

In recent years, DLP (digital light processing) projection optical machines using DMD (digital micromirror array) as a spatial modulator have been rapidly developed due to their rich colors, high contrast, wide output brightness range from tens of lumens to thousands of lumens, and have occupied a large share of 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 eye lenses, spherical lenses and the like), a reflector, a prism, a DMD component, a lens component and the like which are generally 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 transmission surface of the prism to enter the DMD component, and light beams reflected by the DMD component enter the prism again, then are emitted from the other light transmission surface of the prism to enter the lens component. However, with the development trend of product miniaturization and higher requirements on projection effects, the existing projection light machines capable of guaranteeing the projection effects are large in size and difficult to meet market demands; under the condition of ensuring the projection effect, the volume of the projection light machine is reduced, and heat is easily collected in the projection light machine, so that a new product problem is caused.

Disclosure of Invention

Based on the above situation, the main object of the present invention is to provide a projector optical machine and a projector with compact size and good heat dissipation effect.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a projection optical 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 and a second lower shell part, wherein a light source cavity is formed in the first lower shell part, the second lower shell part is internally provided with the first optical processing assembly, 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 arranged at the top of the second lower shell and is positioned at one end far away from the first lower shell; the lens is connected with the upper shell, and the part of the first lower shell part, which exceeds the side face of the second lower shell part, is positioned on the same side of the second lower shell part as the lens; the first optical processing assembly comprises a plurality of lenses and reflectors which are sequentially arranged, and the reflection direction of the reflector faces the second optical processing assembly; the second optical processing assembly comprises a prism group and a DMD group which are sequentially arranged; light emitted by the LED light source module is subjected to optical treatment through the lenses and then reflected by the reflector, the light with the changed propagation direction enters the prism group and then irradiates the DMD group, and the light reflected by the DMD group enters the lens after the propagation direction of the light is changed by the prism group; 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, the 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 conducted out through the heat dissipation column.

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

Preferably, the projection light engine further comprises a second cover plate, and the second cover plate is mounted on the second lower casing to cover the second mounting opening; the first cover plate and the second cover plate are metal cover plates.

Preferably, in the height direction, a projection of the upper housing coincides with a 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 the light path.

Preferably, a central vertical plane a of the DMD assembly is farther from the lens than a central vertical plane B of the prism group near the surface of the DMD group in the optical axis direction of the lens.

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 2 mm.

Preferably, the first optical processing assembly comprises a fly-eye lens, a first lens, a non-rotation symmetrical lens and the reflector which are arranged in sequence; 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, the side wall is vertical to the horizontal plane, and an included angle a is formed between the short side of each LED chip and the horizontal plane; the fly-eye lens comprises a plurality of rectangular light-transmitting units arranged in an array, and an included angle b is formed between the short side of each light-transmitting unit and the horizontal plane; the height direction is the Z-axis direction, the optical axis direction of the lens is the X direction and is parallel to the horizontal plane, and the Y direction is vertical to the X direction in the horizontal plane; the reflector is rectangular-like and comprises a first long edge and a second long edge which are oppositely arranged and parallel to each other, and a first short edge and a second short edge which are oppositely arranged and parallel to each other, wherein the first long edge is farther away from the lens relative to the second long edge, the first short edge is closer to a horizontal plane and a non-rotationally symmetrical lens than the second short edge, one end, connected with the first long edge, of the first short edge is closer to the DMD group than the other end, opposite to the first short edge, of the first long edge is projected above the projection of the second long edge in the YZ plane, and the included angle between the normal of the reflecting surface of the reflector and the YZ plane is c; wherein a is 10-14 degrees, and 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 emitted to an inner wall of the first lower case portion.

The invention also provides a projector which comprises a shell, wherein the projector comprises the projection optical machine, and the projection optical machine is arranged in the shell.

The projection optical machine provided by the invention is designed into an upper part and a lower part, wherein 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 part 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 part, 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 has a compact structure and a small volume. Light enters the shell from the second lower shell part and then enters the lens, the light path trend is special, the size is small, and the light path optimization effect is good. The LED light source module can provide high-power illumination in a product with small volume, and meet higher and higher user requirements; be provided with the heat dissipation post on the first apron, the heat in the light source intracavity 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 the product height, has solved the heat dissipation problem of little volume product.

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

Fig. 3 is a front view of a projection optical machine according to an embodiment of the present 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 projection light machine 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 projection light machine according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a fly-eye lens in the projection optical machine according to the embodiment of the invention in the Y direction.

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

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

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

Fig. 13 and fig. 14 are schematic perspective views of a light housing in a projection light machine 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 of a projection optical machine according to an embodiment of the invention.

Fig. 17 is another exploded view of a projector according to an embodiment of the invention.

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

Fig. 19 is a rear view of a housing in a projection light machine 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 light splitting sheet; 1132. a second dichroic sheet; 13. a first optical processing assembly; 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 assembly; 151. a second lens; 1510. a black mount; 1511. an accommodation site; 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-dissipating column; 1202. a light barrier; 120b, a second cover plate; 121. a first mounting port; 122. a second mounting opening; 123. a third mounting port; 121. a first lower housing portion; 122. a second lower housing portion; 14. an upper housing; 141. a first opening; 142. a second opening; 143. a third opening; 144. a side wall; 16. and (5) a lens.

Detailed Description

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

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

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

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

Referring to fig. 1 to 3, an embodiment of the invention provides a projection optical machine 10, which is placed or fixed on a supporting surface (such as a desktop, a wall surface, etc.) to project an image on a display screen or a wall surface.

As shown in fig. 3, when the projection light engine 10 is placed on the supporting surface, one end close to the supporting surface is defined as "lower", and one end far from the supporting surface is defined as "upper", the projection light engine 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 projector 10 includes an LED light source module 11, a first optical processing module 13, a second optical processing module 15, and a lens 17 (an outer structure of the lens in fig. 4 is not shown), wherein the LED light source module 11 and the first optical processing module 13 are located at a lower portion, and the second optical processing module 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 assembly 13 and the second optical processing assembly 15, and is projected onto a display screen or a wall surface after being optically processed again by the lens 17.

Referring to fig. 1 and fig. 3, the exterior of the optical projection 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 optical projection engine 10, the lower housing 12 includes a first lower housing 121 and a second lower housing 122, the second lower housing 122 is located at one side of the first lower housing 121, and the first lower housing 121 is located at an end of the second lower housing 122. It is understood that the component is located on one side of the component, i.e., on one side of the long side of the component, and is referred to as "located at the end of the component" if the component is located on one side of the wide side thereof; the faces where the long sides and the wide sides/heights are located are "side faces", and the faces where the wide sides and the heights are located are "end faces". The upper shell 14 is mounted on top of the second lower shell 122 and located at an end away from the first lower shell 121; the lens 17 is connected to the upper housing 14, and one end of the first lower housing part 121 close to the lens 17 is located on the same side of the second lower housing part 122 as the lens 17.

As an 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 projection light machine 10 and have the same or substantially the same height with respect to the supporting surface. In the present invention, when the projector engine 10 is placed on a supporting surface, the bottom surface of the lower housing 12 is in contact with the supporting surface.

The first lower case part 121 has a first space (light source cavity) inside, the second lower case part 122 has a second space inside, the LED light source module 11 is partially installed in the first space, the first optical processing assembly 13 is installed in the second space, and the second optical processing assembly 15 is installed 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 defined as a Z-axis direction, an optical axis direction of the lens 17 is defined as an X-direction and is parallel to the horizontal plane, and in the horizontal plane, a Y-direction is perpendicular to the X-direction. The XYZ directions constitute a three-dimensional 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 arranged in a deflected manner, the deflection angle of the light emitting unit 111 is a, and as an embodiment, 5 ° ≦ a ≦ 43 °, it is understood that the light emitting unit 111 is arranged in a deflected manner, that is, an included angle a exists between the edge of the bottom of the light emitting unit 111 (the short side a1) and the horizontal plane, and a is greater than 0 ° and less than 43 °, further preferably 10 ° to 14 °, further preferably 12 °. It is understood that the light emitting unit 111 may be rectangular or square, and when it is square, the edge of the bottom is called as a short side.

In the present embodiment, the light emitting unit 111 is an LED chip, and the LED chip is fixed on a sidewall of the first lower case 121 by a carrier plate or the like. The LED chip may specifically include one or more of a red light source and a green light source, and a blue light source and a PB light source, where the PB light source irradiates the green light source to excite the green light source to emit more green light. In this embodiment, the LED chips include a red light source, a green light source, a blue light source, and a PB light source, wherein four LED chips are disposed on three different side walls of the first lower case 121. As one known type, a light emitting surface of a conventional LED chip is rectangular, and is generally rectangular.

Referring to fig. 4, the optical processing element 113 at least includes a first light splitting element 1131 and a second light splitting element 1132, wherein two sides of the first light splitting element 1131 are respectively provided with a light emitting unit, and one side of the second light splitting element 1132 is provided with two light emitting units.

Referring to fig. 6 and 7, the first optical processing assembly 13 includes one or more lenses and a mirror arranged substantially along a first direction (i.e., Y direction), and in this embodiment, the first optical processing assembly 13 includes a fly-eye lens 131, a first lens 133, a non-rotationally symmetric lens 135 and a mirror 137. Fly-eye lens 131 is deflected by an angle b, a ═ b, fly-eye lens 131 includes a plurality of rectangular light transmitting cells 1311 arranged in an array, and it is understood that fly-eye lens 131 is deflected by an angle b between the bottom edge of each light transmitting cell 1311 (short side b1 of the rectangle) and the horizontal plane, and the angle is greater than 0 ° and smaller than 43 °, preferably 10 ° to 14 °.

The non-rotational symmetric 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 smooth curved surfaces, and the first surface and the second surface are non-rotational symmetric curved surfaces, and the non-rotational symmetric lens is designed to achieve the purpose of optimizing the optical path, and at the same time, reduce the number of lenses in the first optical processing assembly 13, simplify the structure of the first optical processing assembly 13, and reduce the product volume. In the present invention, the non-rotationally symmetric lens 135 and the mirror 137 are disposed directly below the upper case 14.

In this embodiment, the lenses in the first optical processing assembly 13 include only the fly-eye lens 131, the first lens 133 and the non-rotationally symmetric lens 135, and by mutual cooperation between them, the optical processing requirement of the projection optical engine 10 is met, the number of lenses is simplified, the installation complexity is reduced, and the reduction of the product size is facilitated.

Referring to fig. 6 and 8, the mirror 137 in the first optical processing element 13 is also disposed in a deflected manner. The mirror 137 is approximately rectangular (in order to reduce the height of the projector engine 10 in the Z axis, a corner of the rectangular mirror close to the horizontal plane is cut off to form a rectangle-like shape, the rectangle-like shape refers to a shape with an outer contour being 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 non-rotationally symmetric lens 135 than the second short side c4, it can be understood that the mirror 137 is disposed by being deflected, that 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 (i.e. the first long side c3 is closer to the DMD group 155 described later), one end of the first short side c3 connected to the first long side c1 is closer to the DMD group 155 than the other end thereof opposite to the one end, and an angle c, which is an angle c between the reflection surface of the mirror 137 (the surface facing the second optical processing unit 15) and the YZ plane, is set as c. The reflecting surfaces are at non-zero angles to the XYZ axes. The emitting direction of the light reflected by the reflecting mirror 137 is not perpendicular to the horizontal plane.

Referring to fig. 8 and 9, the second optical processing assembly 15 is at least partially located right above the first optical processing assembly 13, and the second optical processing assembly 15 includes a prism group 153 and a DMD group 155 arranged along a second direction, which forms an angle with 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 group 153 and a DMD group 155 are sequentially arranged along the second direction, since the light emitting unit 111, the fly-eye lens 131, the non-rotationally symmetric lens 135 and the reflective mirror 137 in the LED light source module 11 are all disposed in a deflection manner, in order to make the light entering the DMD group 155 be symmetric light, the second lens 151 is disposed to perform symmetric processing on the light.

Prism assembly 153 includes a first prism 1531 and a second prism 1533, second prism 1533 being smaller in size than first prism 1531, first prism 1531 being located between second prism 1533 and DMD assembly 155, second prism 1533 being fixed to one surface of first prism 1531.

Referring to fig. 9, the DMD set 155 is disposed parallel to the horizontal plane, and as an embodiment, the surfaces of the DMD set 155 and the prism set 153 opposite to each other are rectangular parallel to the horizontal plane, and the long sides thereof are parallel to each other and the short sides thereof are also parallel to each other. The DMD set 155 is disposed offset from the prism set 153, specifically, in the X direction, a central vertical plane a of the DMD set 155 and a central vertical plane B of the prism set 153 close to the surface of the DMD set 155 are both perpendicular to the X direction (i.e., the optical axis direction of the projection lens), and the central vertical plane a is farther away from the lens 17 than the central vertical plane B. In the direction of the optic axis, the vertical center plane of the DMD set 155 is the plane passing through the midpoints of the four edges of the DMD set parallel to the optic axis. The surface of the prism assembly 153 close to the plane of the DMD assembly 155 is an M plane, and in the optical axis direction, the vertical plane of the center of the prism assembly 153 is a plane perpendicular to the M plane and passing through the midpoint of two edges of the plane parallel to the optical axis. Center vertical planes A, B are all perpendicular to the optical axis of the projection lens.

The center of the DMD group 155 moves to the left, which can increase the installation space of the right-side components, and is beneficial to the installation of the galvanometer component in the lens 17. After the DMD set 155 is disposed in a deviated manner, in the Z-axis direction, the dimension of the prism set 153 on the central vertical plane a is smaller than the dimension of the prism set 153 on the central vertical plane B, and the optical device on the upstream side of the prism set 153 in the optical path can also be disposed closer to the DMD set 155 by the deviation, so that the height of the whole projection light engine 10 in the Z-axis direction can be reduced, thereby facilitating the miniaturization development of the whole projection light engine 10. On the other hand, the offset arrangement of the DMD set 155 shortens the path of the light beam entering the DMD set 155 through the prism set 153, which can also reduce the design difficulty of the whole optical system and reduce the cost; and the offset arrangement of DMD set 155, which coincides with central vertical plane A, B, facilitates the installation of lens 17.

The distance d between the central vertical plane A and the central vertical plane B is larger than 0 and smaller than 2mm, such as 0.5mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.5mm and the like, and the distance between the central vertical plane A and the central vertical plane B is more preferably 1 mm. With this arrangement, the gap between the prism group 153 and the lens 17 is appropriate, and the lens 17 can be easily mounted.

Referring to fig. 10 to 12, the second lens 151 is a spherical lens fixed in the inner space of the upper housing 14 by a black mounting member 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 away from the lens 17 is closer to the DMD group 155 than an end close to the lens 17, that is, the second lens 151 is obliquely installed in the upper housing 14. As shown in fig. 11, since the DMD set 155 and the prism set 153 are disposed in a deviated manner, light irradiated to the S region cannot enter the DMD set 155, in order to make the light emitted from the second lens 151 effectively enter the DMD set 155, the outline of the black mounting member 1510 matches the shape of the inner space of the upper housing 14 to facilitate fixing in the inner space of the upper housing 14, the black mounting member 1510 is provided with a receiving position 1511, the outline of the receiving position 1511 is circular and matches the outline of the second lens 151, and the second lens 151 is mounted in the receiving position 1511 and fixed by adhesive. A through hole 1513 is arranged at the position corresponding to the accommodating position 1511, the shape and the size of the through hole 1513 are matched with the prism group 153 and the DMD group 155, the through hole 1513 is rectangular, light entering the second lens 151 can only be emitted to the prism group 153 from the through hole 1513, and light at the position of the non-through hole 1513 is shielded by the black mounting member 1510, so that stray light and the like are prevented from entering the prism group 153 to influence the light effect.

Referring to fig. 8, the lens 17 and the second optical processing element 15 are located at the same height, and the inside 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 is understood that the first direction is perpendicular to the second direction and the third direction, and the second direction is not perpendicular to the third direction. Light emitted by the LED light source module 11 is optically processed by the first optical processing assembly 13, reflected by the reflective mirror 137, enters the second lens 151 after changing the light propagation direction, enters the prism group 153, and then irradiates the DMD group 155, and light reflected by the DMD group 155 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 in a top surface of the first lower housing portion 121, a light source cavity therein can be communicated with the outside through the first mounting opening 121, a third mounting opening 123 is formed in a top surface of the second lower housing portion 122, a second mounting opening 122 is formed in a bottom surface of the second lower housing portion 122, the first mounting opening 121 is disposed corresponding to positions of the light source cavity and the fly eye lens 131, or corresponding to positions of the light source cavity, in the present invention, the first mounting opening 121 is disposed corresponding to 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 rotationally asymmetric lens 135 in the first optical processing unit 13, and the first lens 133 and the rotationally asymmetric lens 135 are mounted in the lower housing 12 through the second mounting opening 122. The third mounting opening 123 is provided corresponding to the position of the mirror 137 in the first optical processing assembly 13, that is, the mirror 137 is mounted in the lower case 12 through the third mounting opening 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 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 projections in the height direction all at least partially overlap with projections of the third mounting opening 123.

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

In this embodiment, the lower housing 12 is a plastic housing, and the first cover plate 120a and/or the second cover plate 120b are metal cover plates. The first cover plate 120a is a metal cover plate, and the heat dissipation column 1201 is integrally formed thereon, so that heat in the first space can be quickly led out through the first cover plate 120a, and the performance of the projection light engine 10 is prevented from being influenced by over-high temperature. The light blocking plate 1202 is disposed on the surface of the first cover plate 120a close 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 port, and the mounting port corresponding to 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 projection optical machine 10 has a compact structural design, most of the top surface of the lower housing 12 corresponding to the first optical processing assembly 13 is shielded by the upper housing 14, and in this embodiment, the mounting ports of the first lens 133 and the non-rotationally symmetric lens 135 are skillfully arranged on the bottom surface of the lower housing 12, so that the problem of mounting is solved while the product size is not increased.

Referring to fig. 10, 18 and 19, the projection optical device 10 further includes an upper housing 14, a first opening 141 and a second opening 142 are respectively disposed at the bottom and the top of the upper housing 14, a third opening 143 is disposed at a position close to the lens 17, the first opening 141 and the third mounting opening 123 are in butt joint, the DMD set 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 heat sink, and the side wall 144 connected to the top surface is provided with a heat sink or a heat sink structure, as an embodiment, the heat sink is partially located inside the upper casing 14, and partially located on the outer wall of the upper casing 14, and the heat inside the upper casing 14 is conducted out through the heat sink and dissipated to the external space.

The invention further provides a projector, which comprises a housing, wherein the projector comprises the optical projector 10, and the optical projector 10 is arranged in the housing.

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 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 and a second lower shell part, wherein a light source cavity is formed in the first lower shell part, the second lower shell part is internally provided with the first optical processing assembly, 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 arranged at the top of the second lower shell and is positioned at one end far away from the first lower shell; the lens is connected with the upper shell, and the part of the first lower shell part, which exceeds the side face of the second lower shell part, is positioned on the same side of the second lower shell part as the lens;

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

light emitted by the LED light source module is subjected to optical treatment by the plurality of lenses and then reflected by the reflector, the light with the changed propagation direction enters the prism group and then irradiates the DMD group, and the light reflected by the DMD group enters the lens after the propagation direction of the light is changed by the prism group;

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, 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 can be LED out through the heat dissipation column.

2. The 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 symmetric lens which are arranged in sequence; the bottom surface of the second lower shell part is provided with a second mounting opening, and the top surface of the second lower shell part is provided with a third mounting opening;

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

the second mounting opening at least corresponds to the mounting positions of the first lens and the non-rotational symmetric lens;

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

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

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

4. The 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 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 light engine of claim 1, wherein:

in the optical axis direction of the lens, a central vertical plane A of the DMD assembly is farther away from the lens than a central vertical plane B of the surface of the prism group close to the DMD group.

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

8. The 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, the side wall is vertical to the horizontal plane, and an included angle a is formed between the short side of each LED chip and the horizontal plane;

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

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

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

wherein a is 10-14 degrees, and a-b-c.

9. The light engine of claim 1, wherein: the surface of the first cover plate close to the light source cavity is provided with a light barrier, and in an 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 the light engine of any of claims 1-9, the light engine disposed within the housing.