WO2021218739A1

WO2021218739A1 - Optical engine and laser projection device

Info

Publication number: WO2021218739A1
Application number: PCT/CN2021/088686
Authority: WO
Inventors: 邢哲; 崔雷; 魏伟达
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2020-04-30
Filing date: 2021-04-21
Publication date: 2021-11-04
Also published as: CN115398333A; CN113589633A

Abstract

An optical engine, comprising: a light source (1), an optical mechanical system (2) and a lens (3); the light source (1) is configured to emit light beams; the optical mechanical system (2) comprises an optical mechanical housing (21), an optical component and a radiator (22), the light source (1) is located at a light inlet side of the optical mechanical housing (21), the optical component is provided inside the optical mechanical housing (21) and configured to receive the light beams emitted by the light source (1) and process same, and then emit the processed light beams; the radiator (22) is fixed onto an outer wall of the optical mechanical housing (21), and one end of the radiator (22) extends into the optical mechanical housing (21); the lens (3) is located at a light outlet side of the optical mechanical housing (21), and the lens (3) is configured to receive the processed light beams emitted by the optical component, so as to perform transmission imaging.

Description

Optical engine and laser projection equipment

Cross-references to related applications

This application requires the priority of a Chinese patent application filed with the Chinese Patent Office on April 30, 2020, with an application number of 202010363343.X and an invention title of optical engine, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of projection technology, in particular to an optical engine and laser projection equipment.

Background technique

With the continuous development of technology, optical engines are increasingly used in people's work and life. At present, the optical engine includes a light source, an optomechanical system, and a lens. The light source is used to emit the light beam. The optomechanical system is used to receive and process the light beam emitted by the light source. After that, the processed light beam is emitted to the lens. The lens is used to receive the emitted light from the optomechanical system. The light beam is refracted and reflected to project the light beam onto the projection screen to realize the picture display. The heat generated by the light beam received by the opto-mechanical system is easily concentrated inside the opto-mechanical system, so that the optical components included in the opto-mechanical system heat up. The high temperature will adversely affect the reliability and life of the optical components, so it is necessary Dissipate heat for the opto-mechanical system.

In the related art, the optomechanical system includes an optomechanical housing, an optical device, and a heat sink. The optical device is enclosed and arranged inside the optomechanical housing, and the radiator is arranged on the outer surface of the optomechanical housing. In this way, when the optical device processes the light beam, the heat collected in the optical engine housing can be conducted to the radiator through the optical engine housing, so as to dissipate heat through the radiator.

However, due to the closed design of the opto-mechanical housing, heat can only be conducted through the opto-mechanical housing, and only part of the opto-mechanical housing in contact with the radiator can be conducted to the radiator, thereby reducing the heat dissipation performance.

Summary of the invention

One aspect of the present application provides an optical engine, which includes:

A light source, the light source is used to emit a light beam;

An optomechanical system. The optomechanical system includes an optomechanical housing, an optical device, and a radiator. The light source is located on the light entrance side of the optomechanical housing. The optical device is arranged inside the optomechanical housing for receiving the The light beam emitted by the light source is processed, and then the processed light beam is emitted. The radiator is fixed on the outer wall of the optical engine housing, and one end of the radiator extends into the inside of the optical engine housing;

The lens is located on the side of the light outlet of the optical machine housing, and the lens is used for receiving the processed light beam emitted by the optical device for transmission imaging.

Another aspect of the present application provides a laser projection device. The laser projection device includes a housing in which the optical engine of the above technical solution is accommodated.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of an optical engine provided by an embodiment of the present application;

2 is a schematic diagram of an exploded structure of an optical-mechanical system provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of an exploded structure of a radiator provided by an embodiment of the present application;

Fig. 4 is a schematic diagram of a laser projection system provided by an embodiment of the present application;

Fig. 5 is an optical schematic diagram of a laser projection device provided by an embodiment of the present application.

Reference signs:

1: light source; 2: optomechanical system; 3: lens; 4: first heat dissipation module; 5: second heat dissipation module;

21: Optical machine housing; 22: radiator; 41: first cooling fan; 51: second cooling fan;

211: the first opening; 212: the heat dissipation hole; 213: the lower shell; 214: the upper shell; 221: the first heat dissipation fin; 222: the first heat conducting plate; 223: the first heat pipe; 224: the second Heat conduction plate; 2241: the second opening.

001: Laser projection system; 10: Laser projection equipment;

100: light source part, 200: opto-mechanical part; 300: lens part;

110: red laser; 120: blue laser; 130: green laser; 112: half-wave plate;

260: Diffusion wheel: 220: Light valve

Detailed ways

In order to make the purpose, technical solutions, and advantages of the present application clearer, the implementation manners of the present application will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 illustrates a schematic structural diagram of an optical engine according to an embodiment of the present application. As shown in Fig. 1, the optical engine includes: a light source 1, an optical mechanical system 2 and a lens 3. The light source 1 is used to emit light beams; the optical mechanical system 2 includes an optical mechanical housing 21, an optical device and a heat sink 22, The light source 1 is located at the light entrance side of the optical engine housing 21, and the optical device is arranged inside the optical engine housing 21 for receiving and processing the light beam emitted by the light source 1, and then emitting processing After the light beam, the radiator 22 is fixed on the outer wall of the optical engine housing 21, and one end of the radiator 22 extends into the optical engine housing 21; the lens 3 is located in the optical engine housing 21 On the light exit side of the body 21, the lens 3 is used to receive the processed light beam emitted by the optical device for transmission imaging.

In the embodiment of the present application, since the radiator 22 is fixed on the outer wall of the optical engine housing 21, and one end of the radiator 22 extends into the optical engine housing 21, the heat inside the optical engine housing 21 can be transferred to the radiator 22. The part deep inside the optical engine housing 21 is directly absorbed, and then can be directly transmitted to the outside of the optical engine housing 21 through the radiator 22. In addition, the end of the radiator 22 that extends into the optical engine housing 21 can be closer to the optical device than the optical engine housing 21, so the heat on the optical device can be more easily transferred to the outside of the optical housing through the radiator 22. The heat sink 22 has a significant heat dissipation effect on the optical device, thereby further improving the heat dissipation performance of the optical mechanical system 2. In this way, the optical device can process the light beam emitted by the light source 1 under a suitable temperature environment and emit the light beam to the lens 3, which can transmit and image the light beam.

The optical engine may be an ultra-short-focus optical engine. Of course, the optical engine may also be a short-focus optical engine or a long-focus optical engine, which is not limited in the embodiment of the present application.

Wherein, as shown in FIG. 2, the optical engine housing 21 may include a lower housing 213 and an upper housing 214. The lower housing 213 is used to support optical devices, and the upper housing 214 is used to be fixedly connected to the lower housing 213, thereby Keep the optical engine housing 21 in a sealed state. The material of the optomechanical housing 21 may be magnesium aluminum alloy. The thermal conductivity of the magnesium aluminum alloy is low, the thermal conductivity is weak, and the sealing performance is strong. Specifically, the thermal conductivity of the magnesium aluminum alloy is 80 W/(m·K).

It should be noted that the optomechanical housing 21 can be formed by a die-casting process, so that a lighter and stronger optomechanical housing 21 can be obtained. A sealing member may be provided at the fixed connection between the upper housing 214 and the lower housing 213 included in the optical engine housing 21 to improve the sealing performance of the optical engine housing 21.

Among them, the light source 1 may be a multi-color laser light source or a monochromatic laser light source. The optical device may include one or a combination of DMD (Digital Micromirror Device), lens assembly, TIR (Total Internal Reflection) prism assembly, and galvanometer. The light source 1 is connected to the light entrance side of the optical engine housing 21, and the lens 3 is connected to the light exit side of the optical engine housing 21. The light entrance side and the light exit side of the optical engine housing 21 may be perpendicular or parallel to each other. The DMD can be arranged on the bottom surface of the optical machine housing 21 and perpendicular to the light outlet side of the optical machine housing 21, the lens assembly can be fixed on the bottom surface of the optical machine housing 21, and the light entrance side of the lens assembly faces the optical machine housing 21, the TIR prism assembly is located above the DMD, the light exit side of the TIR prism assembly faces the light exit side of the optical machine housing 21, and the galvanometer is set between the TIR prism assembly and the light exit side of the optical machine housing 21 between. Of course, the optical-mechanical system 2 may also have other structures, which are not limited in the embodiment of the present application.

In this way, the light beam emitted from the light source 1 can sequentially pass through the lens assembly, DMD, TIR prism assembly and galvanometer in the optomechanical housing 21 for modulation, and the modulated light beam is emitted to the lens 3 based on the light exit of the optomechanical system 2. Furthermore, the lens 3 can receive the modulated light beam for transmission imaging.

It should be noted that the power of the light source 1 is relatively large, so the light beam emitted by the light source 1 has high heat. When the light beam irradiates the optical device, it will cause the optical device to generate a strong heat flux. The temperature of the internal space of the housing 21 will gradually increase. In addition, part of the light beam emitted by the light source 1 can be directly emitted to the lens 3 after being propagated by the optical device. Of course, there are some light beams that are not directly emitted to the lens 3, and this part of the light beam is not used for imaging. Based on the above phenomenon, the end of the radiator 22 deep into the optical engine housing 21 can be located at a position that can receive the light beam that is not directly projected to the lens 3, so that the end of the radiator 22 deep into the optical engine housing 21 can not only absorb the optical engine The heat in the internal space of the housing 21 can directly absorb the heat of the light beam that is not directly projected to the lens 3, so that the temperature of the optical device and the internal space of the optical machine housing 21 can be significantly reduced.

It should also be noted that the position of the radiator 22 can be set according to the actual situation. For example, the end of the radiator 22 deep into the optical engine housing 21 can be located between the DMD and the TIR prism assembly to receive the TIR emitted from the DMD. The final prism component does not directly project the light beam to the lens 3, thereby greatly reducing the heat of the TIR prism component. Of course, the end of the radiator 22 that goes deep into the optical engine housing 21 can also be located between the TIR prism assembly and the galvanometer to receive the light beam that is emitted from the TIR prism assembly to the galvanometer and is not directly projected to the lens 3, thereby greatly reducing The heat of the galvanometer.

In some embodiments, as shown in FIG. 2, the heat sink 22 may include a first heat dissipation fin 221 and a first heat conducting plate 222; the first heat dissipation fin 221 is fixed on the outer wall of the optical engine housing 21, and the optical engine housing 21 is provided with a first opening 211, the first side of the first heat conduction plate 222 passes through the first opening 211 to extend into the optical engine housing 21, and the first heat conduction plate 222 and the first heat dissipation The fins 221 are thermally connected; a part of the heat conducting plate on the first heat conducting plate 222 that extends into the optical engine housing 21 is configured to absorb heat in the optical engine housing 21 to conduct the absorbed heat to the first heat dissipation fins 221.

In this way, since the first heat conducting plate 222 extends into the inside of the optical engine housing 21, the first heat conducting plate 222 can more conveniently absorb the heat inside the optical engine housing 21, and then conduct the absorbed heat to the first heat dissipation fins 221 , Thereby speeding up the heat conduction efficiency in the optical engine housing 21. After that, the heat conducted by the first heat conducting plate 222 can be dissipated through the first heat dissipation fins 221, thereby completing the heat dissipation process of the heat sink 22. Therefore, the cooperation of the first heat conducting plate 222 and the first heat dissipation fin 221 can efficiently absorb and radiate the heat inside the optical engine housing 21. In addition, it is also possible to ensure that the first heat-conducting plate 222 can receive the first part of the light beam processed by the optical device based on the position of the first heat-conducting plate 222 extending into the inside of the optical engine housing 21, so as to directly absorb the heat of the first part of the light beam.

Wherein, the first heat conducting plate 222 and the first heat dissipation fin 221 may directly contact and be fixedly connected, of course, they may also be indirectly connected through other heat conducting members, as long as the heat conducting connection can be realized, which is not limited in the embodiment of the present application.

Wherein, the first heat conducting plate 222 can be rectangular, of course, can also be circular, or other shapes, as long as it can facilitate the absorption and conduction of heat. The material of the first heat conducting plate 222 may be copper. Of course, the material of the first heat conducting plate 222 may also be other materials such as aluminum, as long as it has excellent thermal conductivity.

The shape of the first opening 211 may be a long strip, so that the first heat conducting plate 222 can pass through the first opening 211 based on its own side. The width of the first opening 211 may be slightly greater than the width of the first heat conducting plate 222, and the length of the first opening 211 may be slightly greater than the length of one side of the first heat conducting plate 222. In this way, the first heat conducting plate 222 and the first heat conducting plate 222 A closer fit relationship can be formed between the openings 211.

It should be noted that the part of the first heat conducting plate 222 that extends out of the optical machine housing 21 may be provided with a boss, which can limit the first heat conducting plate 222 to prevent the first heat conducting plate 222 from falling into the optical machine housing.体21内。 Body 21.

Wherein, the first part of the light beam may be a light beam that is not directly emitted to the lens 3 after being processed by an optical device. For example, the first part of the light beam may be off light after rotating and reflecting the DMD included in the optical device. Since the first part of the light beam will not be directly used for projection and will not affect the projection effect of the optical engine, the heat of the first part of the light beam can be absorbed by the first heat conducting plate 222 to significantly reduce the temperature in the optical engine housing 21.

Wherein, the first heat dissipation fin 221 may be welded to the outer wall of the optical engine housing 21, of course, it may also be fixedly connected to the optical engine housing 21 by fixing screws. The material of the first heat dissipation fin 221 may be copper. Copper has high thermal conductivity and strong heat conduction and heat dissipation capabilities. Of course, the material of the first heat dissipation fin 221 may also be other materials such as aluminum. Make a limit.

In some embodiments, as shown in FIG. 3, the heat sink 22 may further include at least one first heat conduction tube 223; the first heat dissipation fins 221 may include a plurality of parallel sub-fins, each of the first heat conduction tubes 223 The side wall of the first end of each first heat conducting tube 223 is fixedly connected to the first heat conducting plate 222, the second end of each first heat conducting tube 223 penetrates a plurality of sub-fins, and the side wall of the second end of each first heat conducting tube 223 is connected to the The sub-fins are fixedly connected.

In this way, each first heat conduction pipe 223 can realize the indirect connection between the first heat conduction plate 222 and the multiple sub-fins, and each first heat conduction pipe 223 can transfer the heat on the first heat conduction plate 222 to the multiple sub-fins. In order to realize the heat conduction connection between the first heat conducting plate 222 and the plurality of sub-fins.

Since the plurality of sub-fins included in the first heat dissipation fin 221 can increase the heat dissipation area, the heat dissipation effect can be enhanced. Further, the second end of each first heat transfer tube 223 penetrates a plurality of sub-fins, and the side wall of the second end of each first heat transfer tube 223 is fixedly connected to each sub-fin, so that each first heat transfer tube 223 The heat on the 223 can be conducted to multiple sub-fins at the same time to improve the heat transfer efficiency.

Wherein, the first heat conduction pipe 223 may be a hollow tubular structure sealed at both ends, and the first heat conduction pipe 223 is provided with condensate, when the first heat conduction plate 222 transfers heat to the first end of the first heat conduction pipe 223, The condensate arranged in the first end of a heat conduction tube 223 can evaporate into a gaseous state and diffuse to the second end of the first heat conduction tube 223. The plurality of sub-fins can dissipate heat to the second end of the first heat transfer tube 223, so that the gaseous condensate at the second end of the first heat transfer tube 223 can be condensed into a liquid state. Further, the liquid condensate can slip back to the first end of the first heat conducting tube 223 by capillary action. In this way, a heat conduction cycle can be formed based on the phase change heat transfer, and the heat on the first heat conduction plate 222 can be stably conducted to the first heat dissipation fin 221.

It should be noted that the inside of the first heat pipe 223 may be in a vacuum state, and the condensate may be pure water, of course, it may also be other types of condensate, which is not limited in the embodiment of the present application.

Wherein, the side wall at the first end of each first heat pipe 223 can be welded to the first heat conducting plate 222, and the side wall at the second end of each first heat pipe 223 can be welded to a plurality of sub-fins, of course, the first The connection between the heat pipe 223 and the first heat conducting plate 222, and the connection between the first heat pipe 223 and the plurality of sub-fins may also be other ways. The extension direction of the second end of each first heat transfer tube 223 may be perpendicular to the plane direction of the sub-fins, or may be at an acute angle to the plane direction of the sub-fins, as long as the multiple sub-fins can be evenly distributed to the first heat transfer tube 223 The heat can be dissipated.

It should be noted that the number of the first heat pipes 223 can be set according to actual conditions. For example, the number of the first heat pipes 223 can be two or three, which is not limited in the embodiment of the present application. In addition, the cost of the first heat pipe 223 is low, and the first heat pipe 223 of different materials, different volumes and different shapes can be replaced according to actual conditions.

In some embodiments, each first heat conduction pipe 223 may be a right-angle elbow. Of course, the bending angle and specific shape of each first heat conduction pipe 223 may also be based on the first heat conduction plate 222 and the first heat dissipation fin 221 The positional relationship between the two can be set flexibly, which is not limited in the embodiment of the present application.

In some embodiments, as shown in FIG. 2, the heat sink 22 may further include a second heat conducting plate 224; a heat dissipation hole 212 is provided on the side wall of the optical machine housing 21, and the second heat conduction plate 224 covers the heat dissipation hole 212, and The first heat dissipation fin 221 is fixedly connected to the second heat-conducting plate 224; the second heat-conducting plate 224 is configured to absorb the heat in the opto-mechanical housing 21 to conduct the absorbed heat to The first heat dissipation fins 221. In this way, the second heat conducting plate 224 can facilitate the absorption of heat, and can directly transfer the heat to the first heat dissipation fin 221 connected thereto, so as to facilitate the first heat dissipation fin 221 to dissipate heat.

Wherein, the second heat conducting plate 224 may have a rectangular thin plate-like structure, of course, it may also be a thin plate of other shapes. The material of the second heat conducting plate 224 may be copper, which has high thermal conductivity and strong thermal conductivity. Of course, the material of the second thermal conductive plate 224 can also be other materials such as aluminum, as long as it has excellent thermal conductivity.

Wherein, the heat dissipation hole 212 may be rectangular, or may be other shapes such as a circle. The second heat conducting plate 224 completely covers the heat dissipation hole 212 so as to achieve a sealing effect. At the same time, when the optical device processes the light beam, the light beam emitted to the position of the heat dissipation hole can also be directly irradiated on the second heat conducting plate 224, so as to directly absorb the heat of this part of the light beam through the second heat conducting plate 224. The second heat conducting plate 224 and the optomechanical housing 21 can be fixedly connected by screws, and the second heat conducting plate 224 and the first heat dissipation fin 221 can be welded. Of course, the second heat conducting plate 224 and the optomechanical housing 21 can be connected by welding. The fixed connection between the second heat conducting plate 224 and the first heat dissipation fin 221 can also be achieved in other ways, which is not limited in the embodiment of the present application.

In some embodiments, the plane direction of the second heat conducting plate 224 may be perpendicular to the plane direction of each sub-fin. In this way, each sub-fin can be thermally connected to the second heat-conducting plate 224, and the second heat-conducting plate 224 can directly transfer heat to each sub-fin. Further, each sub-fin perpendicular to the second heat-conducting plate 224 can make The heat on the second heat conducting plate 224 is dissipated more smoothly, reducing obstruction. Of course, the plane direction of the second heat conducting plate 224 may also be an acute angle with the plane direction of each sub-fin, as long as it is beneficial to the heat dissipation.

In some embodiments, as shown in FIG. 3, the second heat conducting plate 224 may be provided with a second opening 2241 that overlaps the first opening 211, and the first side edge of the first heat conducting plate 222 sequentially passes through the second The opening 2241 and the first opening 211. In this way, the first heat conducting plate 222 and the second heat conducting plate 224 can be tightly connected, and the sealing performance of the optomechanical system 2 can be improved.

In some embodiments, the plane direction of the first heat conducting plate 222 may be perpendicular to the plane direction of the second heat conducting plate 224. In this way, the first heat-conducting plate 222 and the second heat-conducting plate 224 that are perpendicular to each other can receive light beams from multiple directions, so that the energy of the light beams can be absorbed more comprehensively. Of course, the plane direction of the first heat-conducting plate 222 can also be an acute angle with the plane direction of the second heat-conducting plate 224, as long as it is beneficial to the absorption of beam energy.

In some embodiments, as shown in FIG. 1, the optical engine may further include at least one heat dissipation module, and at least one heat dissipation module includes a first heat dissipation module 4 connected to the light source 1, and/or an optical engine housing 21 is connected to the second heat dissipation module 5; the first heat dissipation module 4 includes a first heat dissipation fan 41, the second heat dissipation module 5 includes a second heat dissipation fan 51, the first heat dissipation fan 41 and the second heat dissipation fan 51 are both configured To drive the air flow inside the radiator 22. In this way, the heat dissipation of the radiator 22 can be promoted, and the heat dissipation performance of the radiator 22 can be improved.

Wherein, the first heat dissipation module 4 may be an air-cooled heat dissipation module. In this case, the first heat dissipation module 4 may also include at least one second heat pipe and second heat dissipation fins. The first end of each second heat pipe The side wall of the light source 1 can be fixedly connected to the light source 1, and the side wall of the second end of each second heat conducting tube can be fixedly connected to the second heat dissipation fin. In this way, each of the second heat pipes can transfer the heat generated by the light source 1 to the second heat dissipation fins, so that the second heat dissipation fins can dissipate the heat. Further, the first heat dissipation fan 41 may also be configured to drive the air flow inside the second heat dissipation fins to accelerate the heat dissipation of the second heat dissipation fins.

It should be noted that the structure of the second heat pipe may be the same as or similar to the structure of the first heat pipe 223, which will not be repeated in the embodiment of the present application.

Wherein, the second heat dissipation module 5 may be a liquid-cooled heat dissipation module. In this case, the second heat dissipation module 5 may also include one or more heat conduction hoses, a water pump, and third heat dissipation fins. The first end of the at least one heat conduction hose can be fixedly connected to the optical engine housing 21, the second end of the heat conduction hose can be fixedly connected to the third heat dissipation fin, the heat conduction hose can also be connected to the second water pump, and the heat conduction hose A circulating fluid is arranged inside, and the water pump can make the circulating fluid flow back and forth between the first end of the heat-conducting hose and the second end of the heat-conducting hose.

In this way, when the heat at the optical engine housing 21 is transferred to the first end of the heat conduction hose, the temperature of the circulating fluid at the first end of the heat conduction hose increases. Further, the water pump can remove the high temperature circulating fluid from the first end of the heat conduction hose. One end is transferred to the second end of the heat-conducting hose, and the third heat-dissipating fin fixedly connected to the second end of the heat-conducting hose can dissipate and cool the high-temperature circulating fluid, so as to realize the heat dissipation of the light engine housing 21 Disseminate. Further, the water pump can also transfer the cooled circulating fluid from the second end of the heat conducting hose to the first end of the heat conducting hose to form a heat dissipation cycle.

Among them, the circulating fluid may be pure water, and the pure water has a large specific heat capacity, so that a large amount of heat can be absorbed with a small temperature change range, thereby improving the heat dissipation efficiency of the second heat dissipation module 5.

It should be noted that the first end of the heat-conducting hose may be located near the DMD provided in the optical machine housing 21, so that the heat on the DMD can be directly dissipated through the heat-conducting hose. In addition, in order to assist the DMD to dissipate heat, a heat-conducting block can also be arranged near the DMD. One end of the heat-conducting block is connected to the opto-mechanical housing 21. The heat conduction hose connected to the housing 21 dissipates heat.

It should also be noted that when the number of heat-conducting hoses is multiple, there may be multiple heat-conducting hoses whose first ends are connected to the light source 1, and the second ends of the multiple heat-conducting hoses are connected to the third heat dissipation fins. In this way, direct heat dissipation of the light source 1 can be realized.

In some embodiments, when the optical engine includes at least one heat dissipation module, and the first heat dissipation fin 221 includes a plurality of parallel sub-fins, the air flow driven by the heat dissipation fan included in the at least one heat dissipation module is different from any one of the The plane directions of the sub-fins are parallel. In this way, the airflow can flow more evenly through the gap between the two adjacent sub-fins to take away the heat from the surface of each sub-fin, thereby increasing the heat dissipation area of each cooling fin and improving each sub-fin The heat dissipation performance. Of course, the airflow direction can also be an acute angle with the plane direction of any sub-fin, as long as the heat dissipation performance of each sub-fin can be improved.

It should be noted that when the optical engine includes the first heat dissipation module 4 and the second heat dissipation module 5, the airflow direction driven by one of the first heat dissipation module 4 and the second heat dissipation module 5 can be the same as that of any sub The plane directions of the fins are parallel, and the air flow driven by the other of the first heat dissipation module 4 and the second heat dissipation module 5 can be directed to other directions. For example, it can be directed to the lens 3 or the light source 1 to assist the lens 3 or The light source 1 dissipates heat. Of course, the flow direction of the air flow driven by the first heat dissipation module 4 and the second heat dissipation module 5 can be parallel to the plane direction of any sub-fin to enhance the heat dissipation performance of the first heat dissipation fin 221.

In some embodiments, the optomechanical system 2 may further include a light baffle. The light baffle is located inside the optomechanical housing 21 and is fixedly connected to an end of the radiator 22 protruding into the optomechanical housing 21. In this way, the light shielding sheet can cooperate with the first heat conducting plate 222 to increase the amount of heat absorbed by the radiator 22 to the internal heat of the optical engine housing 21 and the receiving area of the first part of the light beam processed by the optical device by one end of the radiator 22. Wherein, the surface of the light shielding sheet can be coated with a light-absorbing material, thereby enhancing the heat absorption effect of the light shielding sheet.

In the embodiment of the present application, under the condition that the projection state, the number of fans included in the optical engine, the ambient temperature and other environmental conditions are the same, the optical engine system 2 including the aluminum radiator 22 in the present application 2 includes the copper radiator The internal temperature of the optical-mechanical system 2 of 22, and the closed optical-mechanical system 2 in the background art, and the temperature of the optical components were measured, and the results are as follows:

Among them, the projection state is black field, and the ambient temperature is 40°C.

As can be seen from the above table, by comparing the temperature of the light barrier and each optical device included in the three optomechanical systems, it can be seen that the optomechanical system including the copper radiator corresponds to the lowest temperature, and the optomechanical system including the aluminum radiator has the lowest temperature. The corresponding temperature of each item has increased, and the temperature of each item corresponding to the closed opto-mechanical system is the highest. It can be seen that the heat dissipation effect of the copper radiator is the most significant, the heat dissipation effect of the aluminum radiator is the second, and the heat dissipation effect of the radiator included in the closed optomechanical system is the weakest. In this way, it can be proved that the heat dissipation performance of the copper radiator is stronger than that of the aluminum radiator. Furthermore, it can be proved that compared with the prior art, the heat dissipation effect of the solution in the embodiment of the present application is more significant.

In the embodiment of the present application, since the radiator is fixed on the outer wall of the optical engine housing, and one end of the radiator extends into the optical engine housing, the heat inside the optical engine housing can be penetrated into the optical engine housing by the radiator The part is directly absorbed, and then can be directly transmitted to the outside of the optical engine housing through the radiator. In addition, the end of the radiator that extends into the optical engine housing can be closer to the optical device relative to the optical engine housing, so the heat on the optical device can be more easily conducted through the radiator to the outside of the optical housing, so the radiator is more effective for the optical device. The heat dissipation effect of the device is more significant, thereby further improving the heat dissipation performance of the optomechanical system. . The at least one heat dissipation module can drive the air flow inside the radiator, thereby enhancing the heat dissipation effect of the radiator and improving the utilization rate of the at least one heat dissipation module. The first heat-conducting plate can receive the first part of the light beam, and the second heat-conducting plate can receive the second part of the light beam, so the first heat-conducting plate and the second heat-conducting plate can directly absorb part of the heat of the light beam. Further, the first heat conducting plate and the second heat conducting plate are both thermally connected to the first heat dissipation fin, so the first heat conduction plate and the second heat conduction plate can directly conduct part of the light beam heat to the first heat dissipation fin, so as to pass through the first heat dissipation fin. A heat dissipation fin realizes heat dissipation. The first heat conduction pipe can efficiently transfer the heat on the first heat conduction plate to the first heat dissipation fins. The optical device can process the light beam emitted by the light source in a suitable temperature environment, and emit the light beam to the lens, and the lens can transmit and image the light beam.

And, an embodiment of the present application also provides a laser projection system 001, which includes a laser projection device 10 and a projection screen. As shown in Fig. 4, the laser projection system 001 may be an ultra-short throw laser projection system. The projection screen may be an optical projection screen, such as a Fresnel optical screen. The laser projection device 10 emits an obliquely upward beam to irradiate the projection screen for imaging. The laser projection device includes a shell casing, and an optical engine is placed in the casing. The optical engine in this example may be the optical engine in the foregoing embodiment.

And, in this example, the light source is a three-color laser light source including a red laser, a green laser, and a blue laser.

And, in this example, the lens is an ultra-short throw projection lens.

And, in this example, the optical-mechanical system adopts a DLP projection architecture, and the light valve is a DMD digital micro-mirror device. And, in this example, a galvanometer is also arranged between the optical path of the DMD digital micromirror device and the lens, which is used to realize the displacement change of the image beam at different times through vibration or movement change, so as to improve the image definition.

And, as an example, FIG. 5 shows a schematic diagram of the optical path of a laser projection device, which is divided into a light source part 100, an optical machine part 200, and a lens part 300 according to the optical function part. The light source part 100 includes a red laser 110, a blue laser 120, a green laser 130, and a plurality of optical lenses. The plurality of optical lenses homogenize and converge the laser beam. Because the laser itself has strong coherence, in order to improve the speckle problem caused by laser projection, the optical path of the light source output to the optical machine can also be provided with a speckle dissipating component, such as a moving diffuser, and a moving diffuser. After the diffuser diffuses the light beam, the divergence angle of the light beam can be increased, which is beneficial to improve the speckle phenomenon. The diffuser wheel 260 shown in FIG. 5 is a rotating diffuser. The light beam emitted from the light source part 100 is incident on the optical machine part 200. The light pipe is usually located at the front end of the optical machine part 200 and is used to first receive the illumination beam of the light source. The light pipe has the function of mixing and homogenizing light, and the exit of the light pipe It is rectangular and has a shaping effect on the light spot. The diffuser wheel 260 is located in the convergent light path of the convergent lens group in the light source part, and the distance from the wheel surface of the diffuser wheel 260 to the light-incident surface of the light-collecting part-light pipe is about 1.5-3 mm. The light pipe has a certain light-receiving angle range. For example, light beams within the range of plus or minus 23 degrees can enter the light pipe and be used by the rear-end illumination light path, while other large-angle light beams become stray light and are blocked, causing light loss. The light exit surface of the diffusion wheel is arranged close to the light entrance surface of the light pipe, which can increase the amount of light that the laser beam is collected into the light pipe after diffusion, and improve the light utilization rate. It should be noted that the above-mentioned light receiving member may also be a fly-eye lens member.

The optical machine part 200 also includes multiple lens groups. TIR or RTIR prisms are used to form an illuminating light path, and the light beam is incident to the core key component-a light valve. The light valve modulates the light beam and enters the lens group of the lens part 300 for imaging. According to different projection architectures, the light valve may include many types, such as LCOS, LCD, or DMD. In this example, the DLP architecture is applied, and the light valve is the DMD chip 260. The laser projection device mentioned in this example may be an ultra-short throw laser projection device. In an ultra-short-throw projection device, the lens part 300 is an ultra-short-throw projection lens, which usually includes a refractor group and a mirror group, and the light beam reflected by the DMD is imaged.

And, in the above-mentioned three-color laser projection apparatus, the light source part 100 is further provided with a half-wave plate 112. Specifically, the half-wave plate 112 may be configured to transmit the combined light beam of the blue laser and the green laser before the combined light path of the combined light beam of the blue laser, the green laser, and the red laser. In a specific implementation, the green laser and the blue laser output S-polarized light, and the red laser output P-polarized light. The polarization direction of the green laser and blue laser by the half-wave plate 112 is changed to be consistent with the polarization direction of the red laser. It can improve the consistency of the light processing process for the three primary colors of red, green, and blue in the entire system, thereby improving the technical problems of uneven chromaticity such as "color spots" and "color blocks" in local areas on the projection screen. The principle is no longer Go into details.

The above are only illustrative examples of this application and are not intended to limit this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection of this application. Within range.

Claims

An optical engine, characterized in that the optical engine includes:

A light source, the light source is used to emit a light beam;

An optomechanical system, the optomechanical system includes an optomechanical housing, an optical device, and a heat sink, the light source is located at the light entrance side of the optomechanical housing, and the optical device is arranged inside the optomechanical housing , For receiving and processing the light beam emitted by the light source, and then emitting the processed light beam, the radiator is fixed on the outer wall of the optical engine housing, and one end of the radiator extends into the optical engine housing Internal body

A lens, the lens is located at the light exit side of the optical machine housing, and the lens is used for receiving the processed light beam emitted by the optical device for transmission imaging.
The optical engine according to claim 1, wherein the optical engine further comprises at least one heat dissipation module, and a first heat dissipation module connected to the light source exists in the at least one heat dissipation module, and/or A second heat dissipation module connected to the optical engine housing;

The first heat dissipation module includes a first heat dissipation fan, and the second heat dissipation module includes a second heat dissipation fan. Both the first heat dissipation fan and the second heat dissipation fan are configured to drive Air flow.
3. The optical engine of claim 1 or 2, wherein the heat sink comprises a first heat dissipation fin and a first heat conducting plate;

The first heat dissipation fin is fixed on the outer wall of the optical engine housing, the side wall of the optical engine housing is provided with a first opening, and the first side of the first heat conducting plate passes through the The first opening extends into the inside of the optical engine housing, and the first heat conducting plate is thermally connected to the first heat dissipation fin;

A part of the heat conducting plate of the first heat conducting plate extending into the optical engine housing is configured to absorb heat in the optical engine housing, so as to conduct the absorbed heat to the first heat dissipation fins.
5. The optical engine of claim 3, wherein the radiator further comprises at least one first heat pipe;

The first heat dissipation fin includes a plurality of parallel sub-fins in pairs, the side wall of the first end of each first heat conduction tube is fixedly connected to the first heat conduction plate, and the second end of each first heat conduction tube The plurality of sub-fins penetrate through, and the side wall of the second end of each first heat conduction tube is fixedly connected with the plurality of sub-fins.
The optical engine according to claim 4, wherein when the optical engine further comprises at least one heat dissipation module, the air flow driven by the heat dissipation fan included in the at least one heat dissipation module flows in the same direction as any one of the sub-fins. The plane direction is parallel.
5. The optical engine of claim 4, wherein each of the first heat conducting pipes is a right-angle elbow pipe.
5. The optical engine of claim 3, wherein the heat sink further comprises a second heat conducting plate;

A heat dissipation hole is provided on the side wall of the optical engine housing, the second heat conducting plate covers the heat dissipation hole and is fixedly connected to the optical engine housing, and the first heat dissipation fin is fixedly connected to the Second heat conducting board;

The second heat conducting plate is configured to absorb heat in the opto-mechanical housing to conduct the absorbed heat to the first heat dissipation fins.
The optical engine of claim 7, wherein the second heat conducting plate is provided with a second opening that coincides with the first opening, and the first side of the first heat conducting plate passes through in turn Through the second opening and the first opening.
8. The optical engine of claim 7, wherein the plane direction of the first heat conducting plate is perpendicular to the plane direction of the second heat conducting plate.
The optical engine according to claim 1, wherein the optical engine system further comprises an optical shutter, and the optical shutter is located inside the optical engine housing and extends into the radiator. One end in the housing of the optical engine is connected.
A laser projection device is characterized by comprising a housing, and the optical engine according to any one of claims 1 to 10 is accommodated in the housing.
11. The laser projection device according to claim 11, wherein the light source is a three-color laser light source, including a red laser, a blue laser and a green laser.
The laser projection device according to claim 11, wherein the lens is an ultra-short throw projection lens.
The laser projection device according to claim 11, wherein the optical device comprises a DMD digital micromirror device, and/or,

The optical device includes a galvanometer.