CN114594647B

CN114594647B - Projection ray apparatus and projection equipment

Info

Publication number: CN114594647B
Application number: CN202210330249.3A
Authority: CN
Inventors: 宋乐乐; 王雨尧
Original assignee: Formovie Chongqing Innovative Technology Co Ltd
Current assignee: Formovie Chongqing Innovative Technology Co Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2023-12-12
Anticipated expiration: 2042-03-31
Also published as: CN114594647A

Abstract

The application relates to a projection optical machine and projection equipment. The projection light machine comprises a shell, an optical component, a fan and a heat exchanger. The optical component comprises a light source, a light condensing piece, a liquid crystal light valve and a first lens, wherein the light condensing piece, the liquid crystal light valve and the first lens are sequentially arranged along the propagation direction of emergent light of the light source, the first lens is arranged in the shell, and the first lens and the shell enclose a first closed cavity. The light gathering piece, the liquid crystal light valve and the fan are arranged in the first closed cavity, and the light source is arranged on the first closed cavity or the shell. The heat exchanger comprises a heat exchange part positioned in the first closed cavity and a heat dissipation part positioned outside the shell, the heat exchanger and the fan are respectively arranged on two opposite sides of the light gathering piece, and the fan is used for enabling air in the first closed cavity to circularly flow and sequentially flow through the liquid crystal light valve, the heat exchange part and the light gathering piece. Therefore, the liquid crystal light valve is ensured to work at a proper temperature, and the liquid crystal light valve is prevented from being damaged due to overhigh temperature; and the liquid crystal light valve is arranged in the first closed cavity, so that dust can not be accumulated on the liquid crystal light valve, and the display effect is ensured.

Description

Projection ray apparatus and projection equipment

Technical Field

The present application relates to the field of projection devices, and in particular, to a projection light machine and a projection device.

Background

The projector consists of a light source, a condensing lens, a front Fresnel lens, a liquid crystal light valve, a rear Fresnel lens, a lens and the like. During projection, the light source emits light, the light irradiates the liquid crystal light valve through the rear Fresnel lens, the emitted light is collected to the lens through the front Fresnel lens, and finally the content displayed by the liquid crystal light valve is projected on the screen.

Because the transmittance of the liquid crystal light valve is low, most of the light irradiated on the liquid crystal light valve is absorbed by the liquid crystal light valve and is reflected in the form of heat, so that the temperature of the liquid crystal light valve is very high. In order to solve the heat dissipation problem of the liquid crystal light valve, a common projection optical machine adopts an open heat dissipation structure, however, the open heat dissipation structure easily causes dust accumulation on the liquid crystal light valve, and affects the display effect. In addition, the heat dissipation effect of the common projection optical machine is poor.

Disclosure of Invention

Based on this, it is necessary to provide a projection light machine and a projection device, which can ensure the display effect of the projection device; and the heat dissipation effect is good.

A projection light engine, comprising:

a housing;

the optical assembly comprises a light source, a light condensing piece, a liquid crystal light valve and a first lens, wherein the light condensing piece, the liquid crystal light valve and the first lens are sequentially arranged along the transmission direction of emergent light of the light source, the first lens is arranged in the shell, a first closed cavity is formed by surrounding the first lens and the shell, the light condensing piece and the liquid crystal light valve are arranged in the first closed cavity, and the light source is arranged in the first closed cavity or on the shell;

the heat exchanger comprises a heat exchange part positioned in the first closed cavity and a heat dissipation part positioned outside the shell, the heat exchanger and the fan are respectively arranged on two opposite sides of the condensing piece, and the fan is used for enabling air in the first closed cavity to circularly flow and sequentially flow through the liquid crystal light valve, the heat exchange part and the condensing piece.

In one embodiment, the light-gathering member is a light cone, the light cone has a light-in end and a light-out end, the cross-sectional area of the light cone gradually increases along the direction from the light-in end to the light-out end, and a space for the air to circulate and flow is formed between the side wall of the light cone and the housing.

In one embodiment, the thickness of the heat exchange portion near the end of the first lens is smaller than the thickness of the heat exchange portion near the end of the light source.

In one embodiment, the side of the heat exchange portion facing the light cone comprises a first plane section, a first inclined plane section and a second plane section which are sequentially connected along the direction from the first lens to the light source, the first inclined plane section inclines from the first plane section to the side wall close to the light cone, and the first inclined plane section is parallel to the side wall of the light cone.

In one embodiment, the widths of the sections of the heat exchanging part and the heat dissipating part corresponding to the light cone gradually decrease along the direction from the first lens to the light source.

In one embodiment, the section of the heat dissipation portion corresponding to the light cone comprises a second inclined surface section and a third inclined surface section which are arranged oppositely, and the section of the heat exchange portion corresponding to the light cone comprises a fourth inclined surface section and a fifth inclined surface section which are arranged oppositely.

In one embodiment, a heat-insulating optical plate is arranged on one side, far away from the first lens, of the liquid crystal light valve, the heat-insulating optical plate, the first lens and the shell enclose to form an air flow channel, a first opening and a second opening are arranged on two opposite sides of the air flow channel, the first opening is communicated with an air outlet of the fan, the second opening is correspondingly arranged with the heat exchange part, and an air inlet of the fan faces the heat exchanger;

the liquid crystal light valve is arranged in the airflow channel, a first air channel is formed between the baffle optical plate and the liquid crystal light valve at intervals, and a second air channel is formed between the liquid crystal light valve and the first lens at intervals.

In one embodiment, the side of the heat-insulating optical plate facing the fan is in sealing fit with the fan; the optical assembly further comprises a second lens, the second lens is arranged between the light condensing piece and the heat-insulating optical plate, and a third airflow channel is formed between the heat-insulating optical plate and the second lens at intervals;

the heat insulation optical plate is sealed and matched with one side, facing the heat exchanger, of the second lens, one side, facing the fan, of the second lens is provided with a third opening at intervals between the second lens and the fan, and the third opening is communicated with the third airflow channel.

In one embodiment, the first lens and the shell also enclose a second closed chamber; the optical assembly further comprises a projection lens and a reflecting mirror, wherein the reflecting mirror and at least part of the projection lens are arranged in the second closed cavity, and the reflecting mirror is used for reflecting light rays emitted by the first lens to the projection lens.

A projection device comprises the projection optical machine.

The projection light machine and the projection equipment are characterized in that the first lens is arranged in the shell, a first closed cavity is formed by surrounding the first lens and the shell, and the liquid crystal light valve, the light gathering piece, the fan and the heat exchange part are arranged in the first closed cavity; during projection, light rays emitted by the light source are condensed by the condensing element and sequentially pass through the liquid crystal light valve and the first lens, and finally the content displayed by the liquid crystal light valve is projected on a screen. In the projection process, when the light which cannot pass through the liquid crystal light valve is converted into heat, the fan works, so that the air in the first closed cavity circularly flows, and the air flows through the liquid crystal light valve to take away the heat of the liquid crystal light valve. Then, the hot air passes through the heat exchange part of the heat exchanger, and the heat exchange part absorbs the heat of the hot air and conducts the heat to the heat dissipation part outside the shell for cooling. The cold air after heat exchange flows through the condensing piece and takes away the heat on the condensing piece. The liquid crystal light valve in the first closed cavity can be cooled by such circulation, so that the liquid crystal light valve works at a proper temperature, damage of the liquid crystal light valve due to overhigh temperature is avoided, and the service life of the projection optical machine is prolonged. In addition, as the optical devices such as the liquid crystal light valve and the like are arranged in the first closed cavity, dust is not accumulated on the liquid crystal light valve, so that the display effect is ensured; and compared with the whole inner space of the shell, the first closed cavity is small in size, so that the heat exchange circulation efficiency can be accelerated, the temperature of optical devices such as a liquid crystal light valve can be quickly reduced, and the heat radiation effect of the projection optical machine can be ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a projector according to an embodiment of the application;

FIG. 2 is a side view of a heat sink of the projection light engine shown in FIG. 1;

FIG. 3 is a rear view of a projection light engine according to an embodiment of the present application;

fig. 4 is a rear view of a projection light engine according to another embodiment of the present application.

Reference numerals illustrate: 10. a housing; 11. a first closed chamber; 12. a second closed chamber; 20. an optical component; 21. a light-gathering member; 211. a light cone; 22. a first lens; 23. a liquid crystal light valve; 24. a second lens; 25. a heat insulating optical plate; 26. a reflecting mirror; 27. a projection lens; 28. a light source; 30. a fan; 31. an air inlet; 32. an air outlet; 40. a heat exchanger; 411. a first planar segment; 412. a first ramp section; 413. a second planar segment; 421. a second ramp section; 422. a third planar segment; 431. a third bevel section; 432. a fourth planar segment; 45. a heat exchange part; 46. a heat dissipation part; 50. an air flow channel; 51. a first airflow passage; 52. a second airflow passage; 53. a third air flow passage; 54. and a third opening.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a projection optical engine according to an embodiment of the application. The projection optical engine of an embodiment of the present application includes a housing 10, an optical assembly 20, a fan 30 and a heat exchanger 40. The optical assembly 20 includes a light source 28, a light condensing element 21, a liquid crystal light valve 23 and a first lens 22 sequentially arranged along a light propagation direction of the light emitted from the light source 28, wherein the first lens 22 is disposed in the housing 10, and the first lens 22 and the housing 10 enclose a first closed chamber 11. The condensing element 21 and the liquid crystal light valve 23 are disposed in the first closed chamber 11, and the light source 28 is disposed in the first closed chamber 11 or on the housing 10. The fan 30 is disposed in the first closed chamber 11, the heat exchanger 40 is disposed on the housing 10, the heat exchanger 40 includes a heat exchanging portion 45 disposed in the first closed chamber 11 and a heat dissipating portion 46 disposed outside the housing 10, the heat exchanger 40 and the fan 30 are disposed on opposite sides of the light collecting member 21, respectively, and the fan 30 is configured to circulate air in the first closed chamber 11 and sequentially flow through the liquid crystal light valve 23, the heat exchanging portion 45 and the light collecting member 21.

In the above-mentioned projector, the first lens 22 is disposed in the housing 10, the first lens 22 and the housing 10 are enclosed to form a first closed chamber 11, and the liquid crystal light valve 23, the light collecting member 21, the fan 30 and the heat exchanging portion 45 are disposed in the first closed chamber 11; during projection, the light emitted by the light source 28 is condensed by the condensing element 21, then sequentially passes through the liquid crystal light valve 23 and the first lens 22, and finally projects the content displayed by the liquid crystal light valve 23 onto a screen. During projection, when the light which cannot pass through the liquid crystal light valve 23 is converted into heat, the fan 30 works to enable the air in the first closed chamber 11 to circularly flow, and the air flows through the liquid crystal light valve 23 to take away the heat of the liquid crystal light valve 23. Then, the hot air passes through the heat exchanging part 45 of the heat exchanger 40, and the heat exchanging part 45 absorbs the heat of the hot air and transfers the heat to the heat radiating part 46 outside the case 10 to cool. The cold air after heat exchange flows through the condensing element 21 and takes away the heat on the condensing element 21. The liquid crystal light valve 23 and the like in the first closed chamber 11 can be cooled by the circulation, so that the liquid crystal light valve 23 works at a proper temperature, the damage of the liquid crystal light valve 23 caused by overhigh temperature is avoided, and the service life of the projection optical machine is prolonged. In addition, the first lens 22 is arranged in the shell 10, the first lens 22 and the shell 10 are surrounded to form a first closed cavity 11, and optical devices such as the liquid crystal light valve 23 and the like are arranged in the first closed cavity 11, so that dust is not accumulated on the liquid crystal light valve 23, and the display effect is ensured; in addition, compared with the whole internal space of the shell 10, the first closed chamber 11 has small space volume, can accelerate the efficiency of heat exchange circulation, quickly reduces the temperature of optical devices such as the liquid crystal light valve 23 and the like, and ensures the heat dissipation effect of the projection optical machine.

Alternatively, the liquid crystal light valve 23 is a liquid crystal panel capable of controlling the throughput of light of different colors according to an input signal to achieve a desired image.

Optionally, the first lens 22 is a fresnel lens, and is used for condensing the light emitted from the liquid crystal light valve 23. Of course, in other embodiments, the first lens 22 can be any other device with the same function, but is not limited thereto.

In one embodiment, referring to fig. 1, the light collecting member 21 is a light cone 211, and the light cone 211 has a light entrance end and a light exit end. The cross-sectional area of the light cone 211 gradually increases along the direction from the light inlet end to the light outlet end, and a space for air circulation to flow through is formed between the side wall of the light cone 211 and the housing 10. In this way, the light cone 211 is used for condensing light, so that the efficiency of the optical assembly 20 can be improved, the light loss can be reduced, the brightness can be increased, and the cost can be reduced. In addition, a space is formed between the side wall of the light cone 211 and the housing 10 so that the cool air heat-exchanged by the heat exchanger 40 flows back to the air inlet 31 of the fan 30 from the space.

The heat exchanging portion 45 and the heat dissipating portion 46 of the heat exchanger 40 each include a plurality of heat dissipating fins disposed at a plurality of intervals, and the plurality of heat dissipating fins extend along a direction from the light incident end to the light emitting end of the light cone 211, respectively, so that a heat exchanging area contacting with flowing air can be increased, and heat exchanging efficiency can be improved.

In one embodiment, referring to fig. 1, the thickness of the heat exchanging portion 45 near the end of the first lens 22 is smaller than the thickness of the heat exchanging portion 45 near the end of the light source 28. Because the side wall of the heat exchange portion 45 near one end of the first lens 22 corresponds to the light emitting end of the light cone 211, the side wall of the heat exchange portion 45 near one end of the light source 28 corresponds to the light entering end of the light cone 211, and the sectional area of the light cone 211 gradually increases along the direction from the light entering end to the light emitting end, the thickness of the heat exchange portion 45 near one end of the first lens 22 is smaller than that of the heat exchange portion 45 near one end of the light source 28, so that the heat exchange portion 45 can effectively utilize the space of the first closed chamber 11 in the shell 10, the heat exchange area of the heat exchange portion 45 is increased, the light cone 211 can be ensured not to interfere with the heat exchanger 40 in the installation process, and the light cone 211 is convenient to install.

For ease of understanding, referring to fig. 1, D1 represents the thickness of the heat exchanging portion 45 near the end of the first lens 22, and D2 represents the thickness of the heat exchanging portion 45 near the end of the light source 28.

Further, referring to fig. 1 and 2, a side of the heat exchanging portion 45 facing the light cone 211 includes a first planar segment 411, a first inclined segment 412 and a second planar segment 413 sequentially connected along the direction from the first lens 22 to the light source 28, the first inclined segment 412 is inclined from the first planar segment 411 to a side wall close to the light cone 211, and the first inclined segment 412 is parallel to the side wall of the light cone 211. Further, the first planar segment 411 and the second planar segment 413 are parallel to the optical axis of the light cone 211. Thus, the light cone 211 is ensured not to interfere with the heat exchanger 40 in the installation process, and the heat exchange area of the heat exchange part 45 is increased, so that the heat exchange efficiency is improved. In addition, the internal space of the casing 10 is fully utilized, so that the projection optical machine is compact in structure and the volume of the projection optical machine is reduced.

In one embodiment, referring to fig. 1 and 3, the widths of the sections of the heat exchanging portion 45 and the heat dissipating portion 46 corresponding to the light cone 211 gradually decrease in the direction from the first lens 22 to the light source 28. In this way, the shape of the housing 10 forming the first closed chamber 11 is adapted to the shape of the light cone 211 and the shape of the heat exchanger 40, so that the volume of the first closed chamber 11 is reduced, and the volume of the projection optical machine is reduced.

Further, referring to fig. 1 and 3, the section of the heat dissipation portion 46 corresponding to the light cone 211 includes a second inclined surface section 421 and a third inclined surface section 431 disposed opposite to each other, and the second inclined surface section 421 and the third inclined surface section 431 are respectively located at two sides of the heat dissipation portion 46 corresponding to the light cone 211 in the width direction; the section of the heat exchange portion 45 corresponding to the light cone 211 comprises a fourth inclined plane section and a fifth inclined plane section which are oppositely arranged, and the fourth inclined plane section and the fifth inclined plane section are respectively positioned at two sides of the heat exchange portion 45 corresponding to the light cone 211 in the width direction. In this way, the volume of the heat exchanger 40 can be reduced, while the volume of the first closed chamber 11 can be reduced, thereby reducing the volume of the projection light machine.

Specifically, referring to fig. 1 and 3, the heat dissipation portion 46 further includes a third planar segment 422 and a fourth planar segment 432 disposed opposite to each other, the third planar segment 422 and the second inclined segment 421 are sequentially connected along the direction from the first lens 22 to the light source 28, and the second inclined segment 421 is inclined from the third planar segment 422 toward the third inclined segment 431. The fourth planar segment 432 and the third inclined segment 431 are sequentially connected in the direction from the first lens 22 to the light source 28, and the third inclined segment 431 is inclined from the fourth planar segment 432 toward the second inclined segment 421. The heat exchanging portion 45 further includes a fifth plane section and a sixth plane section disposed opposite to each other. The fifth planar segment and the fourth beveled segment are connected in sequence in the direction from the first lens 22 to the light source 28, the fourth beveled segment being beveled from the fifth planar segment toward the fifth beveled segment. The sixth planar segment is connected in series with a fifth beveled segment in the direction from the first lens 22 to the light source 28, the fifth beveled segment being beveled from the sixth planar segment toward the fourth beveled segment. In this way, the shape of the housing 10 forming the first closed chamber 11 is adapted to the shape of the light cone 211 and the shape of the heat exchanger 40, so that the volume of the first closed chamber 11 can be reduced, and the volume of the projection optical machine can be reduced.

Optionally, the inclination of the second slope section 421 and the third slope section 431 of the heat dissipating portion 46 is the same as the inclination of the sidewall corresponding to the light cone 211, and the inclination of the fourth slope section and the fifth slope section of the heat exchanging portion is the same as the inclination of the sidewall corresponding to the light cone 211. Therefore, the volume of the projection optical machine can be further reduced, and the heat dissipation effect is ensured.

Optionally, the third planar segment 422 and the fifth planar segment are in the same plane, the fourth planar segment 432 and the sixth planar segment are in the same plane, the second bevel segment 421 and the fourth bevel segment are in the same plane, and the third bevel segment 431 and the fifth bevel segment are in the same plane. In this way, the difficulty of processing the heat exchanger 40 can be reduced.

In another embodiment, referring to fig. 4, fig. 4 shows a rear view of a projection light engine according to another embodiment of the present application. Unlike the above-described embodiment, the width of the heat dissipation portion 46 in the present embodiment is equal in the direction from the first lens 22 to the light source 28. Thus, under the condition of ensuring the heat dissipation effect, the heat exchange part 45 is matched with the shape of the shell 10, and the radiator 40 has larger heat exchange area and higher heat dissipation efficiency. In the present embodiment, a side of the heat dissipating portion 46 facing away from the light condensing member 21 is square.

In one embodiment, referring to fig. 1, a side of the liquid crystal light valve 23 away from the first lens 22 is provided with an insulating optical plate 25, and the insulating optical plate 25, the first lens 22 and the housing 10 enclose an airflow channel 50. The opposite sides of the air flow channel 50 are provided with a first opening and a second opening, the first opening is communicated with the air outlet 32 of the fan 30, the second opening is arranged corresponding to the heat exchange part 45, and the air inlet of the fan 30 faces the heat exchanger 40; the liquid crystal light valve 23 is disposed in the air flow channel 50, a first air flow channel 51 is formed between the liquid crystal light valve 23 and the heat-insulating optical plate 25, and a second air flow channel 52 is formed between the liquid crystal light valve 23 and the first lens 22. Alternatively, an end of the heat exchanging part 45 facing the first lens 22 may pass through the second opening and be inserted into the airflow channel 50 to improve heat exchanging efficiency. During projection, when the light which cannot pass through the liquid crystal light valve 23 is converted into heat, the fan 30 is operated to make air enter the air flow channel 50 through the first opening to take away the heat of the liquid crystal light valve 23. Then, the hot air flows through the heat exchanging part 45 through the second opening, and the heat exchanging part 45 absorbs the heat of the hot air and conducts the heat to the heat radiating part 46 outside the case 10 to cool down. The cold air after heat exchange flows through the condensing element 21, takes away heat on the condensing element 21, and enters the air inlet 31 of the fan 30. The circulation is thus performed to dissipate heat from the optical devices such as the liquid crystal light valve 23 and the condenser 21.

Specifically, referring to fig. 1, the air flow channel 50 includes a first air flow channel 51 and a second air flow channel 52 arranged in parallel, the first air flow channel 51 is formed between the liquid crystal light valve 23 and the heat-insulating optical plate 25, and the second air flow channel 52 is formed between the liquid crystal light valve 23 and the first lens 22. In this way, the fan 30 is operated, and air flows through the first air flow channel 51 and the second air flow channel 52 at the same time, so as to respectively take away the heat of the liquid crystal light valve 23 facing the heat-insulating optical plate 25, the heat of the liquid crystal light valve 23 facing the first lens 22, and the heat of the first lens 22 facing the liquid crystal light valve 23, thereby reducing the temperature of the liquid crystal light valve 23, the first lens 22, and the like.

In one embodiment, referring to FIG. 1, the side of the thermally insulating optical plate 25 facing the fan 30 is in sealing engagement with the fan 30. The optical assembly 20 further includes a second lens 24, the second lens 24 being disposed between the light collector 21 and the thermally insulating optical plate 25. When the light-collecting element 21 is a light cone, the second lens 24 may be disposed at the light-emitting end of the light cone. The side of the thermally insulating optical plate 25 facing the heat exchanger 40 is in sealing engagement with the side of the second lens 24 facing the heat exchanger 40. In this way, the side of the heat-insulating optical plate 25 facing the fan 30 is in sealing fit with the fan 30, so that the cold air blown by the fan 30 flows to the airflow channel 50 completely, and part of the cold air blown by the fan 30 is prevented from directly flowing back to the air inlet 31 of the fan 30 from the position between the heat-insulating optical plate 25 and the fan 30, which is beneficial to improving the heat dissipation effect of the optical devices such as the liquid crystal light valve 23 and the second lens 24. In addition, since the side of the heat-insulating optical plate 25 facing the heat exchanger 40 is in sealing fit with the side of the second lens 24 facing the heat exchanger 40, the hot air flowing out of the air flow channel 50 exchanges heat through the heat exchanging part 45, so that the hot air flowing out of the air flow channel 50 is prevented from flowing between the heat-insulating optical plate 25 and the second lens 24, and the heat dissipation effect of the optical assembly 20 is improved.

Specifically, referring to fig. 1, a first connecting plate is disposed on a side of the heat-insulating optical plate 25 facing the fan 30, and extends from the heat-insulating optical plate 25 in a direction away from the liquid crystal light valve 23, and a plate surface of the first connecting plate is in abutting fit with a side of the fan 30 facing the heat exchanger 40 to realize sealing fit. The side of the heat-insulating optical plate 25 facing the heat exchanger 40 is provided with a second connecting plate, the second connecting plate extends from the heat-insulating optical plate 25 to a direction away from the liquid crystal light valve 23, and the plate surface of the second connecting plate is in butt fit with the side of the second lens 24 facing the heat exchanger 40 to realize sealing fit.

Optionally, the second lens 24 is a fresnel lens, and is configured to convert the light emitted from the light-gathering member 21 into collimated light, and irradiate the liquid crystal light valve 23. Of course, in other embodiments, the second lens 24 can be any other device with the same function, but is not limited thereto.

Further, referring to fig. 1, a third air flow channel 53 is formed between the heat-insulating optical plate 25 and the second lens 24 at a distance, and a third opening 54 communicating with the third air flow channel 53 is formed between the side of the second lens 24 facing the fan 30 and the fan 30 at a distance. In this way, under the action of the fan 30, most of the cold air after heat exchange by the heat exchanger 40 enters the air inlet 31 of the fan 30, and the small part of the cold air enters the third airflow channel 53 from the third opening 54, so that heat of the second lens 24 and the heat-insulating optical plate 25 is taken away, and heat dissipation of the second lens 24 and the heat-insulating optical plate 25 is realized.

In one embodiment, the thermally insulating optical plate 25 comprises thermally insulating glass. Optionally, the insulating glass is counter-heated or endothermic. The surface of the insulating glass is covered with a polarizing film. Specifically, the polarizing film covers one side of the insulating glass near the second lens 24, or covers one side of the insulating glass near the liquid crystal light valve 23. Thus, polarized light usable for liquid crystal control is transmitted for imaging, and polarized light not usable is reflected.

In one embodiment, referring to fig. 1, the first lens 22 and the housing 10 further enclose a second closed chamber 12. The optical assembly 20 further includes a projection lens 27 and a reflecting mirror 26, wherein the reflecting mirror 26 and at least part of the projection lens 27 are disposed in the second closed chamber 12, the reflecting mirror 26 is disposed on an optical path between the first lens 22 and the projection lens 27, and the reflecting mirror 26 is used for reflecting the light emitted from the first lens 22 to the projection lens 27. In this way, the case 10 is partitioned into the first closed chamber 11 and the second closed chamber 12 which are independent of each other by the first lens 22, the light converging member 21, the second lens 24, the heat insulating optical plate 25, the liquid crystal light valve 23, the heat exchanging portion 45 of the fan 30 and the heat exchanger 40 are provided in the first closed chamber 11, and the projection lens 27 is provided in the second closed chamber 12, so that it is possible to prevent heat generated by the liquid crystal light valve 23 and the like in the first closed chamber 11 from entering the second closed chamber 12 to affect the projection lens 27. In addition, by providing the mirror 26 in the second closed chamber 12, the optical path can be folded by the mirror 26, and the size of the housing 10 can be reduced, so that the projector can be miniaturized. Of course, in other embodiments, the reflecting mirror 26 is not required to be disposed in the second closed chamber 12, and the light is converged by the light converging element 21 and then directly irradiated to the projection lens 27 through the second lens 24, the light valve 23 and the first lens 22 in sequence, so that the light path is in a straight line shape.

An embodiment of the present application further provides a projection apparatus, including the projection optical bench of any of the above embodiments.

In the projection device, the first lens 22 is disposed in the housing 10, the first lens 22 and the housing 10 enclose a first closed chamber 11, and the liquid crystal light valve 23, the light collecting element 21, the fan 30 and the heat exchanging portion 45 are disposed in the first closed chamber 11; during projection, the light emitted by the light source 28 is condensed by the condensing element 21, then sequentially passes through the liquid crystal light valve 23 and the first lens 22, and finally projects the content displayed by the liquid crystal light valve 23 onto a screen. During projection, when the light which cannot pass through the liquid crystal light valve 23 is converted into heat, the fan 30 works to enable the air in the first closed chamber 11 to circularly flow, and the air flows through the liquid crystal light valve 23 to take away the heat of the liquid crystal light valve 23. Then, the hot air passes through the heat exchanging part 45 of the heat exchanger 40, and the heat exchanging part 45 absorbs the heat of the hot air and transfers the heat to the heat radiating part 46 outside the case 10 to cool. The cold air after heat exchange flows through the condensing element 21 and takes away the heat on the condensing element 21. The liquid crystal light valve 23 and the like in the first closed chamber 11 can be cooled by the circulation, so that the liquid crystal light valve 23 works at a proper temperature, the damage of the liquid crystal light valve 23 caused by overhigh temperature is avoided, and the service life of the projection optical machine is prolonged. In addition, since the optical devices such as the liquid crystal light valve 23 and the like are arranged in the first closed chamber 11, dust is not accumulated on the liquid crystal light valve 23, so that the display effect is ensured; in addition, compared with the whole internal space of the shell 10, the first closed chamber 11 has small space volume, can accelerate the efficiency of heat exchange circulation, quickly reduces the temperature of optical devices such as the liquid crystal light valve 23 and the like, and ensures the heat dissipation effect of the projection optical machine.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A projection light engine, comprising:

a housing;

the optical assembly comprises a light source, a light gathering piece, a liquid crystal light valve and a first lens, wherein the light gathering piece, the liquid crystal light valve and the first lens are sequentially arranged along the transmission direction of emergent light of the light source, the first lens is arranged in the shell, a first closed cavity is formed by surrounding the first lens and the shell, the light gathering piece and the liquid crystal light valve are arranged in the first closed cavity, the light gathering piece is a light cone, the light cone is provided with a light inlet end and a light outlet end, the sectional area of the light cone is gradually increased along the direction from the light inlet end to the light outlet end, an interval for air to circularly flow is formed between the side wall of the light cone and the shell, and the light source is arranged in the first closed cavity or on the shell;

the fan is arranged in the first closed cavity, the heat exchanger is arranged on the shell, the heat exchanger comprises a heat exchange part arranged in the first closed cavity and a heat dissipation part arranged outside the shell, the heat exchanger and the fan are respectively arranged on two opposite sides of the condensing piece, the thickness of the heat exchange part close to one end of the first lens is smaller than that of the heat exchange part close to one end of the light source, and the fan is used for enabling air in the first closed cavity to circulate and flow and sequentially flow through the liquid crystal light valve, the heat exchange part and the condensing piece.

2. The projection light engine of claim 1, wherein the side of the heat exchanging portion facing the light cone comprises a first planar segment, a first inclined segment and a second planar segment sequentially connected along the direction from the first lens to the light source, the first inclined segment is inclined from the first planar segment to a side wall close to the light cone, and the first inclined segment is parallel to the side wall of the light cone.

3. The projection light engine of claim 1, wherein the widths of the sections of the heat exchanging portion and the heat dissipating portion corresponding to the light cone gradually decrease in a direction from the first lens to the light source.

4. The projection light engine of claim 3, wherein the section of the heat dissipation portion corresponding to the light cone comprises a second inclined surface section and a third inclined surface section which are arranged oppositely, and the section of the heat exchange portion corresponding to the light cone comprises a fourth inclined surface section and a fifth inclined surface section which are arranged oppositely.

5. The projection light engine of claim 4, wherein the second and third inclined surface sections of the heat sink are the same as the sidewalls of the light cone, and the fourth and fifth inclined surface sections of the heat exchanger are the same as the sidewalls of the light cone.

6. The projection light engine of claim 4, wherein the heat dissipation portion further comprises a third plane section and a fourth plane section disposed opposite to each other, the third plane section and the second inclined plane section being sequentially connected in a direction from the first lens to the light source, the second inclined plane section being inclined from the third plane section toward the third inclined plane section, the fourth plane section and the third inclined plane section being sequentially connected in a direction from the first lens to the light source, the third inclined plane section being inclined from the fourth plane section toward the second inclined plane section;

the heat exchange part further comprises a fifth plane section and a sixth plane section which are oppositely arranged, the fifth plane section and the fourth inclined plane section are sequentially connected in the direction from the first lens to the light source, the fourth inclined plane section inclines from the fifth plane section to the fifth inclined plane section, the sixth plane section and the fifth inclined plane section are sequentially connected in the direction from the first lens to the light source, and the fifth inclined plane section inclines from the sixth plane section to the fourth inclined plane section.

7. The projection light machine according to any one of claims 1 to 6, wherein a heat-insulating optical plate is arranged on one side of the liquid crystal light valve, which is far away from the first lens, the heat-insulating optical plate, the first lens and the housing enclose to form an air flow channel, a first opening and a second opening are arranged on two opposite sides of the air flow channel, the first opening is communicated with an air outlet of the fan, the second opening is arranged corresponding to the heat exchange part, and an air inlet of the fan faces the heat exchanger;

the liquid crystal light valve is arranged in the airflow channel, a first air channel is formed between the heat insulation optical plate and the liquid crystal light valve at intervals, and a second air channel is formed between the liquid crystal light valve and the first lens at intervals.

8. The projection light engine of claim 7, wherein a side of the thermally insulating optical plate facing the fan is in sealing engagement with the fan; the optical assembly further comprises a second lens, the second lens is arranged between the light condensing piece and the heat-insulating optical plate, and a third airflow channel is formed between the heat-insulating optical plate and the second lens at intervals;

9. The projection light engine of any one of claims 1-6, wherein the first lens and the housing further define a second enclosed chamber; the optical assembly further comprises a projection lens and a reflecting mirror, wherein the reflecting mirror and at least part of the projection lens are arranged in the second closed cavity, and the reflecting mirror is used for reflecting light rays emitted by the first lens to the projection lens.

10. A projection device comprising a projection engine as claimed in any one of claims 1 to 9.