CN114594647A

CN114594647A - Projection optical machine and projection equipment

Info

Publication number: CN114594647A
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: 2022-06-07
Anticipated expiration: 2042-03-31
Also published as: CN114594647B

Abstract

The invention relates to a projection optical machine and projection equipment. The projection light machine comprises a shell, an optical assembly, a fan and a heat exchanger. 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, and the first lens and the shell are arranged in an enclosing mode to form 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 exchanging part and a heat radiating part, the heat exchanging part is located in the first closed cavity, the heat radiating part is located outside the shell, the heat exchanger and the fan are respectively arranged on two opposite sides of the light gathering part, 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 exchanging part and the light gathering part. Therefore, the liquid crystal light valve is ensured to work at a proper temperature, and the damage of the liquid crystal light valve due to overhigh temperature is avoided; and the liquid crystal light valve is arranged in the first closed cavity, so that dust cannot be accumulated on the liquid crystal light valve, and the display effect is ensured.

Description

Projection optical machine and projection equipment

Technical Field

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

Background

The projector comprises 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 rays, the light rays irradiate the liquid crystal light valve through the rear Fresnel lens, the emitted light rays are converged to the lens through the front Fresnel lens, and finally, the content displayed by the liquid crystal light valve is projected onto the screen.

Since 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, resulting in a very high temperature of the liquid crystal light valve. In order to solve the heat dissipation problem of the liquid crystal light valve, a common projection light machine adopts an open heat dissipation structure, however, the open heat dissipation structure easily causes dust accumulation on the liquid crystal light valve, and the display effect is affected. In addition, the heat dissipation effect of the common projection light machine is poor.

Disclosure of Invention

Accordingly, there is a need for a projector and a projection apparatus, which can ensure the display effect of the projection apparatus; and, the radiating effect is good.

A light engine for projection, 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 fan is arranged in the first closed cavity, the heat exchanger is arranged on the shell and comprises a heat exchanging part and a heat radiating part, the heat exchanging part is positioned in the first closed cavity, the heat radiating part is positioned outside the shell, the heat exchanger and the fan are respectively arranged on two opposite sides of the light gathering part, 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 exchanging part and the light gathering part.

In one embodiment, the light gathering member is a light cone, the light cone has a light entrance end and a light exit end, the cross-sectional area of the light cone gradually increases along the direction from the light entrance end to the light exit end, and a space through which the air circularly flows is formed between the side wall of the light cone and the housing.

In one embodiment, a thickness of the heat exchanging part near one end of the first lens is smaller than a thickness of the heat exchanging part near one end of the light source.

In one embodiment, one side of the heat exchanging portion facing the light cone includes a first plane section, a first inclined plane section, and a second plane section, which are sequentially connected along a direction from the first lens to the light source, wherein the first inclined plane section is inclined from the first plane section to a 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 are gradually reduced 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 slope section and a third slope section which are arranged oppositely, and the section of the heat exchange portion corresponding to the light cone comprises a fourth slope section and a fifth slope section which are arranged oppositely.

In one embodiment, a heat insulation optical plate is arranged on one side of the liquid crystal light valve, which is far away from the first lens, the heat insulation 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 arranged corresponding to the heat exchange portion, 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 partition plate 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 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 gathering piece and the heat insulation optical plate, and a third air flow channel is formed between the heat insulation optical plate and the second lens at intervals;

one side of the heat insulation optical plate, facing the heat exchanger, is in sealing fit with one side of the second lens, facing the fan, and third openings are formed at intervals between one side of the second lens, facing the fan, and are communicated with the third airflow channel.

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

A projection device comprises the projection light machine.

In the projection optical machine and the projection equipment, the first lens is arranged in the shell, the first lens and the shell are enclosed to form the first closed cavity, 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 emitted by the light source is condensed by the condensing element, and then sequentially passes through the liquid crystal light valve and the first lens, and finally, the content displayed by the liquid crystal light valve is projected onto a screen. In the projection process, when light which cannot penetrate through the liquid crystal light valve is converted into heat, the fan works to enable air in the first closed cavity to flow circularly, 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 light gathering piece and takes away the heat on the light gathering piece. The circulation can cool the liquid crystal light valve in the first closed cavity, so that the liquid crystal light valve works at a proper temperature, the liquid crystal light valve is prevented from being damaged due to overhigh temperature, and the service life of the projection light machine is prolonged. In addition, because optical devices such as the liquid crystal light valve and the like are arranged in the first closed cavity, dust cannot be accumulated on the liquid crystal light valve, and the display effect is ensured; and, compare in the whole inner space of casing, the size of first closed cavity is little, can accelerate heat transfer endless efficiency, reduces optical devices such as liquid crystal light valve's temperature fast, guarantees the radiating effect of projection ray apparatus.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection light engine according to an embodiment of the present invention;

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

FIG. 3 is a rear view of a projector according to an embodiment of the invention;

fig. 4 is a rear view of a projector light machine according to another embodiment of the invention.

The reference numbers illustrate: 10. a housing; 11. a first enclosed chamber; 12. a second enclosed 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. an insulating optical plate; 26. a 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 slope section; 413. a second planar segment; 421. a second slope section; 422. a third planar segment; 431. a third slope section; 432. a fourth planar segment; 45. a heat exchanging part; 46. a heat dissipating section; 50. an air flow channel; 51. a first air flow passage; 52. a second airflow channel; 53. a third air flow channel; 54. a third opening.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection light engine according to an embodiment of the invention. The optical projection engine of an embodiment of the present invention 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, and a light gathering member 21, a liquid crystal light valve 23 and a first lens 22 sequentially disposed along a propagation direction of 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 to form a first enclosed cavity 11. The light-gathering member 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 arranged in the first closed chamber 11, the heat exchanger 40 is arranged on the housing 10, the heat exchanger 40 comprises a heat exchange portion 45 located in the first closed chamber 11 and a heat dissipation portion 46 located outside the housing 10, the heat exchanger 40 and the fan 30 are respectively arranged on two opposite sides of the light gathering member 21, and the fan 30 is used for enabling air in the first closed chamber 11 to circularly flow and sequentially flow through the liquid crystal light valve 23, the heat exchange portion 45 and the light gathering member 21.

In the above projection optical machine, the first lens 22 is disposed in the housing 10, the first lens 22 and the housing 10 are enclosed to form the first enclosed 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 enclosed chamber 11; during projection, light emitted from the light source 28 is condensed by the light condenser 21, and then passes through the liquid crystal light valve 23 and the first lens 22 in sequence, and finally, the content displayed by the liquid crystal light valve 23 is projected onto a screen. During the projection process, when the light that cannot pass through the liquid crystal light valve 23 is converted into heat, the fan 30 operates to circulate the air in the first closed chamber 11, and the air flows through the liquid crystal light valve 23 to remove the heat of the liquid crystal light valve 23. Then, the hot air passes through the heat exchanging portion 45 of the heat exchanger 40, and the heat exchanging portion 45 absorbs heat of the hot air and transfers the heat to the heat radiating portion 46 outside the casing 10 to cool down. The cold air after heat exchange flows through the light gathering member 21 and takes away heat on the light gathering member 21. By such circulation, the liquid crystal light valve 23 and the like in the first closed chamber 11 can be cooled, so that the liquid crystal light valve 23 works at a proper temperature, the liquid crystal light valve 23 is prevented from being damaged due to overhigh temperature, and the service life of the projection light machine is prolonged. In addition, the first lens 22 is arranged in the shell 10, the first lens 22 and the shell 10 are arranged in an enclosing manner to form a first closed chamber 11, and optical devices such as the liquid crystal light valve 23 are arranged in the first closed chamber 11, so that dust cannot be accumulated on the liquid crystal light valve 23, and the display effect is ensured; moreover, compared with the whole internal space of the housing 10, the space volume of the first closed chamber 11 is small, which can accelerate the efficiency of heat exchange cycle, quickly reduce the temperature of optical devices such as the liquid crystal light valve 23, and ensure the heat dissipation effect of the projection light machine.

Alternatively, the liquid crystal light valve 23 is a liquid crystal panel, and the liquid crystal panel can control the passing amount of the light of different colors according to the input signal to achieve the desired image.

Optionally, the first lens 22 is a fresnel lens for converging the light emitted from the liquid crystal light valve 23. Of course, in other embodiments, the first lens 22 may also be other devices with the same function, and is not limited thereto.

In one embodiment, referring to fig. 1, the light gathering member 21 is a light cone 211, and the light cone 211 has a light entrance end and a light exit end. The sectional area of the light cone 211 gradually increases along the direction from the light-entering end to the light-exiting end, and a space for air to flow through circularly is formed between the side wall of the light cone 211 and the housing 10. In this way, by condensing light using the light cone 211, the efficiency of the optical unit 20 can be improved, light loss can be reduced, brightness can be increased, and 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 cold air after heat exchange by the heat exchanger 40 flows back to the air inlet 31 of the fan 30 from the space.

The heat exchange portion 45 and the heat dissipation portion 46 of the heat exchanger 40 each include a plurality of heat dissipation fins that a plurality of intervals set up, and a plurality of heat dissipation fins extend to the direction of light-emitting end along the income light end of the light cone 211 respectively to can increase the heat transfer area with the contact of mobile air, improve heat exchange efficiency.

In one embodiment, referring to fig. 1, the thickness of the heat exchanging part 45 near the first lens 22 is smaller than the thickness of the heat exchanging part 45 near the light source 28. Because the lateral wall that heat transfer portion 45 is close to first lens 22 one end corresponds the light-emitting end that is light cone 211, the lateral wall that heat transfer portion 45 is close to light source 28 one end corresponds the income light end that is light cone 211, and the sectional area of light cone 211 increases along the direction of going into light end to light-emitting end gradually, the thickness that heat transfer portion 45 is close to first lens 22 one end is less than the thickness that heat transfer portion 45 is close to light source 28 one end, can make heat transfer portion 45 effectively utilize the space of first closed cavity 11 in the casing 10 like this, increase the heat transfer area of heat transfer portion 45, and can guarantee that light cone 211 can not produce the interference with heat exchanger 40 in the in-process of installation, light cone 211 is convenient to install.

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

Further, referring to fig. 1 and 2, a side of the heat exchanging portion 45 facing the light cone 211 includes a first planar section 411, a first inclined section 412 and a second planar section 413 sequentially connected along a direction from the first lens 22 to the light source 28, the first inclined section 412 is inclined from the first planar section 411 to a side wall close to the light cone 211, and the first inclined section 412 is parallel to the side wall of the light cone 211. Further, the first and second

planar sections

411 and 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 meanwhile, the heat exchange area of the heat exchange part 45 is increased, and the heat exchange efficiency is improved. In addition, the inner space of the casing 10 is fully utilized, so that the optical projection engine has a compact structure, and the volume of the optical projection engine is reduced.

In one embodiment, referring to fig. 1 and 3, the widths of the sections of the heat exchanging part 45 and the heat dissipating part 46 corresponding to the light cone 211 are gradually reduced 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 shapes of the light cone 211 and the heat exchanger 40, so as to reduce the volume of the first closed chamber 11, and thus reduce the volume of the projection light engine.

Further, referring to fig. 1 and 3, a section of the heat dissipation portion 46 corresponding to the light cone 211 includes a second slope section 421 and a third slope section 431, which are oppositely disposed, and the second slope section 421 and the third slope section 431 are respectively located at two sides of the heat dissipation portion 46 corresponding to the section of the light cone 211 in the width direction; the section of the heat exchanging portion 45 corresponding to the light cone 211 includes a fourth slope section and a fifth slope section, which are oppositely disposed, and the fourth slope section and the fifth slope section are respectively located at two sides of the section of the heat exchanging 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, and the volume of the first closed chamber 11 can be reduced, thereby reducing the volume of the projector engine.

Specifically, referring to fig. 1 and 3, the heat dissipating part 46 further includes a third planar segment 422 and a fourth planar segment 432, which are oppositely disposed, the third planar segment 422 and the second inclined segment 421 are sequentially connected in a 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 section 432 and the third inclined section 431 are sequentially connected in a direction from the first lens 22 to the light source 28, and the third inclined section 431 is inclined from the fourth planar section 432 toward the second inclined section 421. The heat exchanging part 45 further includes a fifth plane section and a sixth plane section which are oppositely arranged. The fifth planar segment is connected to the fourth inclined segment in sequence along the direction from the first lens 22 to the light source 28, and the fourth inclined segment is inclined from the fifth planar segment toward the fifth inclined segment. The sixth planar segment is connected to the fifth inclined segment in sequence along the direction from the first lens 22 to the light source 28, and the fifth inclined segment is inclined from the sixth planar segment toward the fourth inclined segment. Thus, the shape of the housing 10 forming the first closed chamber 11 is adapted to the shape of the light cone 211 and the heat exchanger 40, so that the volume of the first closed chamber 11 can be reduced, and the volume of the projection light engine can be reduced.

Optionally, the inclinations of the second inclined surface section 421 and the third inclined surface section 431 of the heat dissipation part 46 are the same as the inclination of the side wall corresponding to the light cone 211, and the inclinations of the fourth inclined surface section and the fifth inclined surface section of the heat exchange part are the same as the inclination of the side wall corresponding to the light cone 211. So, can further reduce projection ray apparatus's volume to guarantee the radiating effect.

Optionally, the third plane segment 422 and the fifth plane segment are located on the same plane, the fourth plane segment 432 and the sixth plane segment are located on the same plane, the second inclined plane segment 421 and the fourth inclined plane segment are located on the same plane, and the third inclined plane segment 431 and the fifth inclined plane segment are located on the same plane. Thus, the difficulty in processing the heat exchanger 40 can be reduced.

In another embodiment, referring to fig. 4, fig. 4 is a rear view of a light engine according to another embodiment of the invention. Unlike the above-described embodiment, the width of the heat dissipation portion 46 is equal in the direction from the first lens 22 to the light source 28 in the present embodiment. Thus, under the condition of ensuring the heat dissipation effect, the heat exchange part 45 is matched with the shape of the shell 10, the heat sink 40 has a larger heat exchange area, and the heat dissipation efficiency is higher. In the present embodiment, the side of the heat dissipation portion 46 facing away from the light gathering 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 a heat insulation optical plate 25, and the heat insulation optical plate 25, the first lens 22 and the housing 10 enclose to form an air flow channel 50. A first opening and a second opening are arranged on two opposite sides of the airflow channel 50, 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 airflow channel 50, a first airflow channel 51 is formed between the liquid crystal light valve 23 and the heat insulation optical plate 25 at an interval, and a second airflow channel 52 is formed between the liquid crystal light valve 23 and the first lens 22 at an interval. Alternatively, an end of the heat exchanging portion 45 facing the first lens 22 may pass through the second opening and be inserted into the air flow channel 50 to improve heat exchanging efficiency. During the projection process, when the light that cannot pass through the liquid crystal light valve 23 is converted into heat, the fan 30 operates 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 heat of the hot air and transfers the heat to the heat dissipating part 46 outside the housing 10 to cool down. The cold air after heat exchange flows through the light gathering member 21, takes away heat on the light gathering member 21, and enters the air inlet 31 of the fan 30. The circulation realizes heat dissipation to 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 insulating optical plate 25 at an interval, and the second air flow channel 52 is formed between the liquid crystal light valve 23 and the first lens 22 at an interval. Thus, the fan 30 operates, and air flows through the first air flow channel 51 and the second air flow channel 52 simultaneously to take away heat of the liquid crystal light valve 23 facing the thermal insulation optical plate 25, heat of the liquid crystal light valve 23 facing the first lens 22, and heat of the first lens 22 facing the liquid crystal light valve 23, respectively, so as to lower 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 insulating optical sheet 25 facing the fan 30 is in sealing engagement with the fan 30. The optical assembly 20 further includes a second lens 24, and the second lens 24 is disposed between the light-gathering member 21 and the insulating optical plate 25. When the light-gathering member 21 is a light cone, the second lens 24 can be disposed at the light-emitting end of the light cone. The side of the 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. Thus, since the side of the thermal insulation optical plate 25 facing the fan 30 is in sealing fit with the fan 30, the cool air blown by the fan 30 flows to the airflow channel 50, and a part of the cool air blown by the fan 30 is prevented from directly flowing back to the air inlet 31 of the fan 30 from a position between the thermal insulation 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, because the side of the thermal insulation 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 flows through the heat exchanging part 45 for heat exchange, and the hot air flowing out of the air flow channel 50 is prevented from flowing between the thermal insulation optical plate 25 and the second lens 24, which is beneficial to improving the heat dissipation effect of the optical assembly 20.

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

Optionally, the second lens 24 is a fresnel lens for converting the light emitted from the light-gathering part 21 into collimated light to irradiate the liquid crystal light valve 23. Of course, in other embodiments, the second lens 24 may also be other devices with the same function, and is not limited thereto.

Further, referring to fig. 1, a third airflow channel 53 is formed between the thermal insulation optical plate 25 and the second lens 24, and a third opening 54 communicated with the third airflow channel 53 is formed between one side of the second lens 24 facing the fan 30 and the fan 30. Thus, 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 a small part of the cold air enters the third airflow channel 53 from the third opening 54, so as to take away heat of the second lens 24 and the thermal insulation optical plate 25, thereby realizing heat dissipation of the second lens 24 and the thermal insulation optical plate 25.

In one embodiment, the insulating optical sheet 25 includes insulating glass. Optionally, the insulating glass is of the heat-resistant or heat-absorbing type. The plate surface of the insulating glass is covered with a polarizing film. Specifically, a polarizing film is covered on the side of the heat insulating glass close to the second lens 24, or a polarizing film is covered on the side of the heat insulating glass close to the liquid crystal light valve 23. In this way, polarized light that is usable for liquid crystal control is transmitted for imaging, and polarized light that is unusable is reflected.

In one embodiment, referring to fig. 1, the first lens 22 and the housing 10 further enclose a second enclosed chamber 12. The optical assembly 20 further includes a projection lens 27 and a reflection mirror 26, the reflection mirror 26 and at least a portion of the projection lens 27 are disposed in the second closed chamber 12, the reflection mirror 26 is disposed on a light path between the first lens 22 and the projection lens 27, and the reflection mirror 26 is configured to reflect light emitted from the first lens 22 to the projection lens 27. In this way, the housing 10 is divided 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 collecting member 21, the second lens 24, the thermal insulation optical plate 25, the liquid crystal light valve 23, the fan 30 and the heat exchanging portion 45 of the heat exchanger 40 are disposed in the first closed chamber 11, and the projection lens 27 is disposed in the second closed chamber 12, so that the heat generated by the liquid crystal light valve 23 and the like in the first closed chamber 11 can be prevented from entering the second closed chamber 12 to affect the projection lens 27. In addition, by providing the reflecting mirror 26 in the second closed chamber 12, the light path can be folded by the reflecting mirror 26, and the size of the housing 10 can be reduced, so that the projection optical system can be miniaturized. Of course, in other embodiments, the reflector 26 may not be disposed in the second closed chamber 12, and the light rays are converged by the light converging member 21 and then directly irradiate 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 invention further provides a projection device, including the optical projection engine of any of the above embodiments.

In the projection apparatus, the first lens 22 is disposed in the housing 10, the first lens 22 and the housing 10 enclose to form the first enclosed 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 enclosed chamber 11; during projection, light emitted from the light source 28 is condensed by the light condenser 21, and then passes through the liquid crystal light valve 23 and the first lens 22 in sequence, and finally, the content displayed by the liquid crystal light valve 23 is projected onto a screen. During the projection process, when the light that cannot pass through the liquid crystal light valve 23 is converted into heat, the fan 30 operates to circulate the air in the first closed chamber 11, and the air flows through the liquid crystal light valve 23 to remove the heat of the liquid crystal light valve 23. Then, the hot air passes through the heat exchanging portion 45 of the heat exchanger 40, and the heat exchanging portion 45 absorbs heat of the hot air and transfers the heat to the heat radiating portion 46 outside the casing 10 to cool down. The cold air after heat exchange flows through the light gathering member 21 and takes away heat on the light gathering member 21. By such a cycle, the liquid crystal light valve 23 and the like in the first closed chamber 11 can be cooled, so that the liquid crystal light valve 23 works at a proper temperature, the liquid crystal light valve 23 is prevented from being damaged due to overhigh temperature, and the service life of the projection light machine is prolonged. In addition, because optical devices such as the liquid crystal light valve 23 and the like are arranged in the first closed chamber 11, dust cannot be accumulated on the liquid crystal light valve 23, and the display effect is ensured; in addition, compared with the whole internal space of the casing 10, the space volume of the first closed chamber 11 is small, which can accelerate the efficiency of heat exchange cycle, quickly reduce the temperature of optical devices such as the liquid crystal light valve 23, and ensure the heat dissipation effect of the projection light machine.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" 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 as used herein are for illustrative purposes only and do not denote a unique embodiment.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A projection light engine, comprising:

a housing;

2. The light projector as claimed in claim 1, wherein the light collector is a light cone, the light cone has a light entrance end and a light exit end, a cross-sectional area of the light cone increases gradually along a direction from the light entrance end to the light exit end, and a space for the air to flow circularly is formed between a side wall of the light cone and the housing.

3. The optical projection engine of claim 2, wherein the thickness of the heat exchanging portion near the first lens is smaller than the thickness of the heat exchanging portion near the light source.

4. The light projector of claim 3, wherein the heat exchanging portion comprises a first plane section, a first inclined section and a second plane section sequentially connected to each other along a direction from the first lens to the light source, the first inclined section is inclined from the first plane section to a side wall close to the light cone, and the first inclined section is parallel to the side wall of the light cone.

5. The light projector as claimed in claim 2, wherein the widths of the sections of the heat exchanging portion and the heat dissipating portion corresponding to the light cone are gradually reduced along the direction from the first lens to the light source.

6. The light engine of claim 5, wherein the section of the heat dissipation portion corresponding to the light cone comprises a second slope section and a third slope section that are disposed opposite to each other, and the section of the heat exchanging portion corresponding to the light cone comprises a fourth slope section and a fifth slope section that are disposed opposite to each other.

7. The projection machine according to any one of claims 1 to 6, wherein a side of the liquid crystal light valve away from the first lens is provided with a thermal insulation optical plate, the first lens and the housing enclose to form an airflow channel, two opposite sides of the airflow channel are provided with a first opening and a second opening, the first opening is communicated with an air outlet of the fan, the second opening is arranged corresponding to the heat exchanging portion, and an air inlet of the fan faces the heat exchanger;

8. The projection engine of claim 7, wherein a side of the thermal insulation 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 gathering piece and the heat insulation optical plate, and a third air flow channel is formed between the heat insulation optical plate and the second lens at intervals;

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

10. A projection device comprising the light engine of any of claims 1 to 9.