CN115398333A - Optical engine and laser projection equipment - Google Patents

Abstract

An optical engine, comprising: the device comprises a light source (1), an optical-mechanical system (2) and a lens (3), wherein the light source (1) is used for emitting light beams; the optical-mechanical system (2) comprises an optical-mechanical shell (21), an optical device and a radiator (22), wherein the light source (1) is positioned on the light inlet side of the optical-mechanical shell (21), the optical device is arranged in the optical-mechanical shell (21) and is used for receiving and processing light beams emitted by the light source (1) and then emitting the processed light beams, the radiator (22) is fixed on the outer wall of the optical-mechanical shell (21), and one end of the radiator (22) extends into the optical-mechanical shell (21); the lens (3) is positioned at the light outlet side of the optical machine shell (21), and the lens (3) is used for receiving the processed light beams emitted by the optical device to perform transmission imaging.

Description

Optical engine and laser projection equipment

Cross Reference to Related Applications

The present application claims priority of the chinese patent application entitled optical engine filed by the chinese patent office at 30/4/2020 with application number 202010363343.X, the entire contents of which are incorporated herein by reference.

Technical Field

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

Background

With the continuous development of science and technology, optical engines are increasingly applied to the work and life of people. The optical engine comprises a light source, an optical-mechanical system and a lens, wherein the light source is used for emitting light beams, the optical-mechanical system is used for receiving and processing the light beams emitted by the light source and then emitting the processed light beams to the lens, and the lens is used for receiving and refracting and reflecting the light beams emitted by the optical-mechanical system to project the light beams onto a projection screen to realize image display. The heat generated by the light beam received by the optical-mechanical system is easily collected inside the optical-mechanical system, so that the temperature of the optical device included in the optical-mechanical system is increased, and the reliability and the service life of the optical device are adversely affected due to the high temperature, and therefore the heat dissipation of the optical-mechanical system is necessary.

In the related art, the optical-mechanical system includes an optical-mechanical housing, an optical device and a heat sink, the optical device is disposed inside the optical-mechanical housing, and the heat sink is disposed on an outer surface of the optical-mechanical housing. Therefore, when the optical device processes the light beam, the heat gathered in the optical machine shell can be conducted to the radiator through the optical machine shell so as to be radiated through the radiator.

However, due to the closed design of the optical machine housing, heat can only be conducted through the optical machine housing, and only a part of heat on the optical machine housing contacting with the heat sink can be conducted to the heat sink, so that the heat dissipation performance is reduced.

Disclosure of Invention

An aspect of the present application provides an optical engine, including:

a light source for emitting a light beam;

the optical-mechanical system comprises an optical-mechanical shell, an optical device and a radiator, wherein the light source is positioned at the light inlet side of the optical-mechanical shell, the optical device is arranged inside the optical-mechanical shell and is used 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-mechanical shell, and one end of the radiator extends into the optical-mechanical shell;

and the lens is positioned on the light outlet side of the optical machine shell and is used for receiving the processed light beam emitted by the optical device and performing transmission imaging.

Another aspect of the present application provides a laser projection apparatus, including: the optical engine of the technical scheme is contained in the shell.

Drawings

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

FIG. 1 is a schematic diagram of an optical engine according to an embodiment of the present disclosure;

fig. 2 is an exploded view of an opto-mechanical system according to an embodiment of the present disclosure;

fig. 3 is an exploded view of a heat sink according to an embodiment of the present disclosure;

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 apparatus according to an embodiment of the present application.

Reference numerals:

1: a light source; 2: an opto-mechanical system; 3: a lens; 4: a first heat dissipation module; 5: a second heat dissipation module;

21: a light machine shell; 22: a heat sink; 41: a first heat dissipation fan; 51: a second heat dissipation fan;

211: a first opening; 212: heat dissipation holes; 213: a lower housing; 214: an upper housing; 221: a first heat radiation fin; 222: a first heat-conducting plate; 223: a first heat conductive pipe; 224: a second heat-conducting plate; 2241: and a second opening.

001: a laser projection system; 10: a laser projection device;

100: light source portion, 200: an opto-mechanical section; 300: a lens portion;

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

260: a diffusion wheel: 220: light valve

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to 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: the device comprises a light source 1, an optical-mechanical system 2 and a lens 3, wherein the light source 1 is used for emitting light beams; the optical-mechanical system 2 comprises an optical-mechanical housing 21, an optical device and a radiator 22, wherein the light source 1 is located at the light inlet side of the optical-mechanical housing 21, the optical device is arranged inside the optical-mechanical housing 21 and is used for receiving and processing the light beam emitted by the light source 1 and then emitting the processed light beam, the radiator 22 is fixed on the 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 on the light outlet side of the optical machine shell 21, and the lens 3 is used for receiving the processed light beam emitted by the optical device and performing transmission imaging.

In the embodiment of the application, since the heat sink 22 is fixed on the outer wall of the optical machine housing 21, and one end of the heat sink 22 extends into the optical machine housing 21, the heat inside the optical machine housing 21 can be directly absorbed by the heat sink 22 penetrating into the optical machine housing 21, and then can be directly conducted to the outside of the optical machine housing 21 through the heat sink 22. In addition, one end of the heat sink 22 extending into the optical engine housing 21 may be closer to the optical device than the optical engine housing 21, so that heat on the optical device may be more easily conducted to the outside of the optical housing through the heat sink 22, and thus the heat dissipation effect of the heat sink 22 on the optical device is more significant, thereby further improving the heat dissipation performance of the optical engine system 2. The optical device can process the light beam emitted by the light source 1 under a proper temperature environment and emit the light beam to the lens 3, and the lens 3 can perform transmission imaging on the light beam.

The optical engine may be an ultra-short-focus optical engine, and certainly, the optical engine may also be a short-focus optical engine or a long-focus optical engine, which is not limited in this application.

As shown in fig. 2, the optical-mechanical housing 21 may include a lower housing 213 and an upper housing 214, the lower housing 213 is used for supporting the optical device, and the upper housing 214 is used for being fixedly connected to the lower housing 213, so that the optical-mechanical housing 21 maintains a sealed state. The material of the optical machine housing 21 may be magnesium aluminum alloy, which has a low thermal conductivity, a weak thermal conductivity, and a strong sealing property, specifically, the thermal conductivity of the magnesium aluminum alloy is 80W/(m · K).

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

The light source 1 may be a multicolor laser light source or a monochromatic laser light source. The optical Device may include one or a combination of a DMD (Digital Micromirror Device), a lens assembly, a TIR (Total Internal Reflection) prism assembly, and a vibrating mirror. The light source 1 is connected at the light inlet side of the optical machine shell 21, the lens 3 is connected at the light outlet side of the optical machine shell 21, and the light inlet side and the light outlet side of the optical machine shell 21 can be mutually vertical or parallel. DMD can set up the bottom surface at ray apparatus casing 21, and is perpendicular with ray apparatus casing 21's light-emitting port side, and the lens subassembly can be fixed on ray apparatus casing 21's bottom surface, and the income light side of lens subassembly is towards the income light port side of ray apparatus casing 21, and TIR prism subassembly is located the top of DMD, and TIR prism subassembly's light-emitting port side is towards ray apparatus casing 21, and the setting of vibrating mirror is between TIR prism subassembly and ray apparatus casing 21's light-emitting port side. Of course, the optical-mechanical system 2 may have other structures, which is not limited in this embodiment.

Like this, the light beam of light source 1 outgoing can be modulated through lens subassembly, DMD, TIR prism subassembly and the galvanometer in ray apparatus casing 21 in proper order to the light beam after will modulating is based on ray-emitting outlet outgoing to camera lens 3 of ray apparatus system 2, and then camera lens 3 can receive the light beam after the modulation and carry out the transmission formation of image.

It should be noted that, the power of the light source 1 is relatively large, so that the light beam emitted from the light source 1 has relatively high heat, when the light beam irradiates on the optical device, the optical device generates relatively strong heat flux, and simultaneously the temperature of the optical device and the internal space of the optical machine housing 21 gradually increases. In addition, a part of the light beam emitted from the light source 1 may be directly emitted to the lens 3 after propagating through the optical device, and of course, there is a part of the light beam that is not directly emitted to the lens 3 and is not used for imaging. Based on the above phenomenon, one end of the heat sink 22 extending into the optical engine housing 21 may be located at a position capable of receiving the light beam not directly projected to the lens 3, so that one end of the heat sink 22 extending into the optical engine housing 21 may not only absorb the heat of the internal space of the optical engine housing 21, but also directly absorb the heat of the light beam not directly projected to the lens 3, thereby significantly reducing the temperature of the optical device and the internal space of the optical engine housing 21.

It should also be noted that the position of the heat sink 22 can be set according to the actual situation, for example, one end of the heat sink 22 deep into the optical mechanical housing 21 can be located between the DMD and the TIR prism assembly to receive the light beam emitted from the DMD to the TIR prism assembly and not finally projected directly to the lens 3, so as to greatly reduce the heat of the TIR prism assembly. Of course, one end of the heat sink 22 extending into the optical machine housing 21 may also be located between the TIR prism assembly and the vibrating mirror to receive the light beam emitted from the TIR prism assembly to the vibrating mirror and not finally projected directly to the lens 3, so as to greatly reduce the heat of the vibrating mirror.

In some embodiments, as shown in fig. 2, the heat sink 22 may include first heat dissipating fins 221 and a first heat conducting plate 222; the first heat dissipation fin 221 is fixed on the outer wall of the optical machine housing 21, a first opening 211 is arranged on the side wall of the optical machine housing 21, a first side edge of the first heat conduction plate 222 passes through the first opening 211 to extend into the optical machine housing 21, and the first heat conduction plate 222 is in heat conduction connection with the first heat dissipation fin 221; the portion of the first heat conducting plate 222 protruding into the light engine housing 21 is configured to absorb heat in the light engine housing 21 to conduct the absorbed heat to the first heat dissipating fins 221.

In this way, since the first heat conduction plate 222 extends into the optical machine housing 21, the first heat conduction plate 222 can more conveniently absorb the heat inside the optical machine housing 21, and further conduct the absorbed heat to the first heat dissipation fins 221, thereby accelerating the conduction efficiency of the heat inside the optical machine housing 21. Thereafter, the heat conducted by the first heat conduction plate 222 may be dissipated through the first heat dissipation fins 221, thereby completing the heat dissipation process of the heat sink 22. Therefore, the cooperation between the first heat conduction plate 222 and the first heat dissipation fins 221 can efficiently absorb and dissipate heat inside the carriage housing 21. In addition, based on the position of the first heat conduction plate 222 extending into the optical-mechanical housing 21, it is ensured that the first heat conduction plate 222 can receive the first partial light beam processed by the optical device, so as to directly absorb the heat of the first partial light beam.

The first heat conducting plate 222 and the first heat dissipating fins 221 may be directly contacted and fixedly connected, or may be indirectly connected through another heat conducting member, as long as the heat conducting connection can be achieved, which is not limited in the embodiment of the present invention.

The first heat conducting plate 222 may be rectangular, circular, or other shapes as long as the heat absorption and conduction can be facilitated. The material of the first heat conduction plate 222 may be copper, but the material of the first heat conduction plate 222 may also be other materials such as aluminum, as long as the material has excellent heat conduction performance.

The first opening 211 may be shaped as a long strip, so that the first heat conducting plate 222 can pass through the first opening 211 based on its side. The width of the first opening hole 211 may be slightly larger than the width of the first heat conduction plate 222, and the length of the first opening hole 211 may be slightly larger than the length of one edge of the first heat conduction plate 222, so that a relatively close fit relationship may be formed between the first heat conduction plate 222 and the first opening hole 211.

It should be noted that, a portion of the first heat conducting plate 222 extending out of the optical engine housing 21 may be provided with a boss, and the boss may limit the first heat conducting plate 222, so as to prevent the first heat conducting plate 222 from falling into the optical engine housing 21.

The first partial light beam may be a light beam processed by an optical device and not directly emitted to the lens 3. Illustratively, the first partial light beam may be off light after rotating reflection by a DMD comprised by the optical device. Since the first portion of the light beam is not directly used for projection and does not affect the projection effect of the optical engine, the first heat conduction plate 222 can absorb the heat of the first portion of the light beam to significantly reduce the temperature inside the optical housing 21.

The first heat dissipation fins 221 may be welded to the outer wall of the optical housing 21, or may be fixedly connected to the optical housing 21 by fixing screws. The first heat dissipation fins 221 may be made of copper, which has a high thermal conductivity and a strong heat conduction and dissipation capability, and certainly, the first heat dissipation fins 221 may also be made of other materials such as aluminum, which is not limited in this embodiment.

In some embodiments, as shown in FIG. 3, the heat sink 22 may further comprise at least one first thermally conductive tube 223; the first heat dissipating fin 221 may include a plurality of sub-fins that are parallel to each other, a sidewall of a first end of each first heat conducting pipe 223 is fixedly connected to the first heat conducting plate 222, a second end of each first heat conducting pipe 223 penetrates through the plurality of sub-fins, and a sidewall of a second end of each first heat conducting pipe 223 is fixedly connected to the plurality of sub-fins.

In this way, each of the first heat conductive pipes 223 can achieve indirect connection of the first heat conductive plate 222 with the plurality of sub-fins, and each of the first heat conductive pipes 223 can transfer heat on the first heat conductive plate 222 to the plurality of sub-fins to achieve heat conductive connection of the first heat conductive plate 222 with the plurality of sub-fins.

Since the first heat dissipation fin 221 includes a plurality of sub-fins, the heat dissipation area can be increased, and thus the heat dissipation effect can be enhanced. Further, the second end of each of the first heat conductive pipes 223 penetrates through the plurality of sub-fins, and the sidewall of the second end of each of the first heat conductive pipes 223 is fixedly connected to each of the sub-fins, so that the heat on each of the first heat conductive pipes 223 can be simultaneously conducted to the plurality of sub-fins to improve the heat transfer efficiency.

The first heat pipe 223 may be a hollow tubular structure with two sealed ends, and a condensate is disposed in the first heat pipe 223, and when the first heat pipe 222 transfers heat to the first end of the first heat pipe 223, the condensate disposed in the first end of the first heat pipe 223 may be evaporated into a gaseous state and diffused toward the second end of the first heat pipe 223. The plurality of sub-fins may dissipate heat from the second end of the first heat conductive pipe 223 so that the gaseous condensate at the second end of the first heat conductive pipe 223 may be condensed into a liquid state. Further, the liquid condensate may be wicked back to the first end of the first heat pipe 223. Thus, a heat conduction cycle can be formed based on the phase change heat transfer, and thus the heat on the first heat conduction plate 222 can be stably conducted to the first heat dissipation fins 221.

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

The sidewall of the first end of each first heat conduction pipe 223 may be welded to the first heat conduction plate 222, and the sidewall of the second end of each first heat conduction pipe 223 may be welded to the plurality of sub-fins, but of course, the connection manner between the first heat conduction pipe 223 and the first heat conduction plate 222, and the connection manner between the first heat conduction pipe 223 and the plurality of sub-fins may be other manners. The extending direction of the second end of each first heat conductive pipe 223 may be perpendicular to the plane direction of the sub-fins, or may form an acute angle with the plane direction of the sub-fins, as long as uniform heat dissipation of the first heat conductive pipes 223 by the plurality of sub-fins can be achieved.

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

In some embodiments, each first heat conducting pipe 223 can be a right-angle bent pipe, and of course, the bending angle and the specific shape of each first heat conducting pipe 223 can also be flexibly set according to the positional relationship between the first heat conducting plate 222 and the first heat dissipating fins 221, which is not limited in this embodiment of the present invention.

In some embodiments, as shown in fig. 2, the heat spreader 22 may further include a second thermally conductive plate 224; the side wall of the optical machine housing 21 is provided with heat dissipation holes 212, the second heat conduction plate 224 covers the heat dissipation holes 212 and is fixedly connected with the optical machine housing 21, and the first heat dissipation fins 221 are fixedly connected to the second heat conduction plate 224; the second heat conduction plate 224 is configured to absorb heat within the light-absorbing housing 21 to conduct the absorbed heat to the first heat dissipation fins 221. In this way, the second heat conduction plate 224 can facilitate heat absorption and directly transfer heat to the first heat dissipation fins 221 connected thereto, so as to facilitate heat dissipation by the first heat dissipation fins 221.

The second heat conduction plate 224 may have a rectangular thin plate structure, but may have a thin plate with another shape. The second heat-conducting plate 224 may be made of copper, which has a high thermal conductivity and a strong thermal conductivity. Of course, the material of the second heat conduction plate 224 can be other materials such as aluminum, so long as it has excellent heat conduction performance

The heat dissipation holes 212 may be rectangular, circular, or other shapes. The second heat-conducting plate 224 completely covers the heat dissipation hole 212, so as to achieve the sealing effect. Meanwhile, when the optical device processes the light beam, the light beam emitted to the position of the heat dissipation hole can also directly irradiate on the second heat conduction plate 224, so that the heat of the light beam can be directly absorbed by the second heat conduction plate 224. The second heat conducting plate 224 and the optical machine housing 21 can be fixedly connected through screws, and the second heat conducting plate 224 and the first heat dissipating fins 221 can be welded, of course, the second heat conducting plate 224 and the optical machine housing 21, and the second heat conducting plate 224 and the first heat dissipating fins 221 can also be fixedly connected through other modes, which is not limited in the embodiment of the present application.

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

In some embodiments, as shown in fig. 3, the second heat-conducting plate 224 may be provided with a second opening 2241 coinciding with the first opening 211, the first side edge of the first heat-conducting plate 222 passing through the second opening 2241 and the first opening 211 in sequence. 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 optical-mechanical system 2 can be improved.

In some embodiments, the planar orientation of the first heat-conducting plate 222 may be perpendicular to the planar orientation of the second heat-conducting plate 224. Thus, the first and second thermally conductive plates 222, 224, which are perpendicular to each other, can receive light beams from multiple directions, thereby absorbing the energy of the light beams more fully. Of course, the planar orientation of the first heat-conducting plate 222 can also be at an acute angle to the planar orientation of the second heat-conducting plate 224, so long as absorption of the beam energy is facilitated.

In some embodiments, as shown in fig. 1, the optical engine may further include at least one heat dissipation module, where there is a first heat dissipation module 4 connected to the light source 1 and/or a second heat dissipation module 5 connected to the optical-mechanical housing 21; the first thermal module 4 includes a first thermal fan 41, the second thermal module 5 includes a second thermal fan 51, and both the first thermal fan 41 and the second thermal fan 51 are configured to drive the airflow inside the heat sink 22 to flow. This promotes heat dissipation from the heat sink 22, and improves the heat dissipation performance of the heat sink 22.

The first heat dissipation module 4 may be an air-cooled heat dissipation module, and at this time, the first heat dissipation module 4 may further include at least one second heat pipe and a second heat dissipation fin, a side wall of a first end of each second heat pipe may be fixedly connected to the light source 1, and a side wall of a second end of each second heat pipe may be fixedly connected to the second heat dissipation fin. In this way, each second heat conduction pipe can transfer the heat generated by the light source 1 to the second heat dissipation fins, so as to facilitate the heat dissipation by the second heat dissipation fins. Further, the first heat dissipation fan 41 may be configured to drive the airflow inside the second heat dissipation fin to accelerate the heat dissipation of the second heat dissipation fin.

It should be noted that the structure of the second heat pipe can be the same as or similar to the structure of the first heat pipe 223, and details of this embodiment are not repeated herein.

The second heat dissipation module 5 may be a liquid-cooled heat dissipation module, and at this time, the second heat dissipation module 5 may further include one or more heat conductive hoses, a water pump, and a third heat dissipation fin. The first end of at least one heat conduction hose can be fixedly connected with the optical machine shell 21, the second end of the heat conduction hose can be fixedly connected with the third radiating fin, the heat conduction hose can also be connected with the second water pump, circulating liquid is arranged in the heat conduction hose, and the circulating liquid can flow between the first end of the heat conduction hose and the second end of the heat conduction hose in a reciprocating mode through the water pump.

Like this, when the heat transfer of ray apparatus casing 21 department was to the first end of heat conduction hose, the circulation liquid temperature of the first end of heat conduction hose rose, and further, the water pump can transmit high temperature circulation liquid to the second end of heat conduction hose from the first end of heat conduction hose, and then can dispel the heat and cool down high temperature circulation liquid with the third radiating fin of the second end fixed connection of heat conduction hose to can realize giving off the ray apparatus casing 21 heat. Further, the water pump can also transmit the cooled circulating liquid from the second end of the heat-conducting hose to the first end of the heat-conducting hose to form heat dissipation circulation.

Wherein, the circulation liquid can be the pure water, and the specific heat capacity of pure water is big, therefore can absorb a large amount of heats under less temperature variation range to improve second heat dissipation module 5's radiating efficiency.

It should be noted that the first end of the heat conducting hose may be located near the DMD disposed in the optical engine housing 21, so that the heat on the DMD may be directly dissipated through the heat conducting hose. In addition, in order to assist the heat dissipation of the DMD, a heat conducting block can be further arranged near the DMD, one end of the heat conducting block is connected with the optical machine shell 21, and the heat conducting block can conduct the heat on the DMD to the optical machine shell 21 so as to dissipate the heat through a heat conducting hose connected with the optical machine shell 21.

It should be noted that, when the number of the heat conducting hoses is plural, there may be a plurality of heat conducting hoses whose first ends are connected to the light source 1, and a plurality of heat conducting hoses whose second ends are connected to the third heat dissipating fins, so that direct heat dissipation of the light source 1 may be achieved.

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 sub-fins parallel to each other, the airflow direction driven by the heat dissipation fan included in the at least one heat dissipation module is parallel to the plane direction of any of the sub-fins. Therefore, the airflow can more uniformly flow through the gap between two adjacent sub-fins to take away the heat on the surface of each sub-fin, so that the heat dissipation area of each heat dissipation fin can be increased, and the heat dissipation performance of each sub-fin is improved. Of course, the airflow direction may also form 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 flow direction of the air flow driven by one of the first heat dissipation module 4 and the second heat dissipation module 5 may be parallel to the plane direction of any sub-fin, and the flow direction of the air flow driven by the other of the first heat dissipation module 4 and the second heat dissipation module 5 may face other directions, for example, may face the lens 3 or the light source 1, so as to assist the lens 3 or the light source 1 in dissipating heat. Certainly, the flow directions of the air flows 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, so as to enhance the heat dissipation performance of the first heat dissipation fin 221.

In some embodiments, the opto-mechanical system 2 may further include a light blocking plate, which is located inside the opto-mechanical housing 21 and is fixedly connected to an end of the heat sink 22 that extends into the opto-mechanical housing 21. In this way, the light blocking sheet can cooperate with the first heat conducting plate 222 to increase the amount of heat absorbed by the heat sink 22 into the interior of the optical housing 21 and the area of the heat sink 22 that receives the first portion of the light beam after the optical device processing. Wherein, the surface of light blocking piece can coat the light absorbing material, and then can strengthen the heat absorption effect of light blocking piece.

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 all the same, the internal temperatures of the opto-mechanical system 2 including the aluminum heat sink 22, the opto-mechanical system 2 including the copper heat sink 22, and the closed opto-mechanical system 2 in the background art, and the temperatures of the optical devices are measured, and the results are as follows:

wherein the projection state is a black field, and the ambient temperature is 40 ℃.

As can be seen from the above table, by comparing the temperatures of the light blocking sheet and each optical device included in the three optical-mechanical systems, the temperature of each optical-mechanical system including the copper heat sink is the lowest, the temperature of each optical-mechanical system including the aluminum heat sink is increased, and the temperature of each optical-mechanical system including the closed heat sink is the highest. Therefore, the heat dissipation effect of the copper heat sink is the most significant, the heat dissipation effect of the aluminum heat sink is the second best, and the heat dissipation effect of the heat sink included in the closed optical-mechanical system is the weakest. Thus, it can be proved that the heat radiation performance of the copper radiator is stronger than that of the aluminum radiator. Further, it can be proved that the heat dissipation effect of the scheme in the embodiment of the present application is more significant compared with the prior art.

In the embodiment of the application, because the radiator is fixed on the outer wall of the optical machine shell, and one end of the radiator extends into the optical machine shell, the heat inside the optical machine shell can be directly absorbed by the part, deep into the optical machine shell, on the radiator, and then can be directly conducted to the outer side of the optical machine shell through the radiator. In addition, one end of the radiator extending into the interior of the optical machine shell can be closer to the optical device relative to the optical machine shell, so that heat on the optical device can be more easily conducted out of the optical device through the radiator, the radiating effect of the radiator on the optical device is more obvious, and the radiating performance of the optical machine system is further improved. . The at least one heat dissipation module can drive the airflow in the radiator to flow, so that the heat dissipation effect of the radiator can be enhanced, and the utilization rate of the at least one heat dissipation module is improved. The first thermally conductive plate may receive the first portion of the light beam and the second thermally conductive plate may receive the second portion of the light beam, such that the first and second thermally conductive plates may directly absorb heat from the portion of the light beam. Furthermore, the first heat-conducting plate and the second heat-conducting plate are in heat conduction connection with the first radiating fins, so that the first heat-conducting plate and the second heat-conducting plate can directly conduct heat of partial light beams to the first radiating fins to realize heat dissipation through the first radiating fins. The first heat conduction pipe can efficiently transfer heat on the first heat conduction plate to the first radiating fins. The optical device can process the light beam emitted by the light source under a proper temperature environment and emit the light beam to the lens, and the lens can transmit and image the light beam.

Furthermore, the embodiment of the present application further 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-focus laser projection system. The projection screen may be an optical projection screen, such as a fresnel optical screen. The laser projection device 10 emits a light beam in an obliquely upward direction to a projection screen for imaging. The laser projection device includes a housing case in which an optical engine is housed. 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-focus projection lens.

In the present example, the optical-mechanical system adopts DLP projection architecture, and the light valve is a DMD digital micromirror device. In this example, a galvanometer is further disposed between the DMD digital micromirror device and the optical path of the lens, and is used to implement displacement change of the image light beam at different moments through vibration or movement change, so as to improve image definition.

And, exemplarily, fig. 5 shows a schematic diagram of an optical path of a laser projection apparatus, which is divided into a light source part 100, an optical-mechanical part 200, and a lens part 300 according to an optical function part. The light source section 100 includes a red laser 110, a blue laser 120, a green laser 130, and a plurality of optical lenses for homogenizing and condensing laser beams. Since the laser itself has strong coherence, in order to improve the speckle problem caused by laser projection, a speckle dispersing component, such as a moving diffusion sheet, may be further disposed in the light path from the light source to the optical engine, and after the moving diffusion sheet diffuses the light beam, the divergence angle of the light beam may be increased, which is beneficial to improve the speckle phenomenon, such as the diffusion wheel 260 shown in fig. 5, i.e. a rotating diffusion sheet. The light beam emitted from the light source 100 is incident to the optical-mechanical part 200, and a light guide tube is usually located at the front end of the optical-mechanical part 200 for firstly receiving the illumination light beam of the light source, and the light guide tube has the functions of mixing and homogenizing, and the outlet of the light guide tube is rectangular, and has a shaping effect on the light spot. The diffusion wheel 260 is located in the converging light path of the converging lens group in the light source part, and the wheel surface of the diffusion wheel 260 is about 1.5-3 mm away from the light receiving component, namely the light incident surface of the light guide. The light guide tube has a certain light receiving angle range, for example, light beams within a range of plus or minus 23 degrees can enter the light guide tube and be utilized by a rear-end illumination light path, and other light beams with large angles become stray light to be blocked outside to form light loss. The light-emitting surface of the diffusion wheel is arranged close to the light-in surface of the light guide pipe, so that the light quantity of the diffused laser beams in the light guide pipe can be increased, and the light utilization rate is increased. The light-absorbing member may be a fly-eye lens member.

The optical-mechanical portion 200 further includes a plurality of lens groups, and the TIR or RTIR prism is used to form an illumination light path, and to inject the light beam to the light valve, which is a key core device, and the light valve modulates the light beam and then injects the light beam into the lens group of the lens portion 300 for imaging. Depending on the projection architecture, the light valve can comprise a wide variety, such as LCOS, LCD or DMD, and in this example, a DLP architecture is employed and the light valve is a DMD chip 260. The laser projection device mentioned in this example may be an ultra-short-focus laser projection device. In the ultra-short-focus projection apparatus, the lens portion 300 is an ultra-short-focus projection lens, and generally includes a refractive lens group and a reflective lens group, so as to image the light beam reflected by the DMD.

And, in the above three-color laser projection apparatus, the light source section 100 is further provided with the half-wave plate 112 in part. Specifically, the half-wave plate 112 may be disposed in front of the combined optical path of the blue laser beam, the green laser beam, and the red laser beam, and configured to transmit the emitted combined optical beam of the blue laser beam and the green laser beam. In a specific implementation, the green laser and the blue laser respectively output S polarized light, the red laser outputs P polarized light, the polarization direction of the half-wave plate 112 to the green laser and the blue laser is changed to be consistent with the polarization direction of the red laser, so that the consistency of the whole system to the light processing process of the red, green and blue three primary colors can be improved, the technical problem of uneven chroma such as 'color spots' and 'color blocks' appearing in a local area on a projection picture can be solved, and the principle is not repeated.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (14)

1. An optical engine, comprising:

   a light source for emitting a light beam;

   the optical-mechanical system comprises an optical-mechanical shell, an optical device and a radiator, wherein the light source is positioned on the light inlet side of the optical-mechanical shell, the optical device is arranged in the optical-mechanical shell and used 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-mechanical shell, and one end of the radiator extends into the optical-mechanical shell;

   and the lens is positioned on the light outlet side of the optical machine shell and is used for receiving the processed light beam emitted by the optical device and performing transmission imaging.
2. The optical engine of claim 1, wherein the optical engine further comprises at least one heat sink module, wherein there is a first heat sink module connected to the light source and/or a second heat sink module connected to the optical engine housing;

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

   the first heat dissipation fin is fixed on the outer wall of the optical machine shell, a first opening is formed in the side wall of the optical machine shell, a first side edge of the first heat conduction plate penetrates through the first opening to extend into the optical machine shell, and the first heat conduction plate is in heat conduction connection with the first heat dissipation fin;

   the part of the first heat conducting plate extending into the optical machine shell is configured to absorb heat in the optical machine shell so as to conduct the absorbed heat to the first radiating fin.
4. The optical engine of claim 3, wherein the heat sink further comprises at least one first heat pipe;

   the first radiating fins comprise a plurality of sub-fins which are parallel to each other, the side wall of the first end of each first heat conduction pipe is fixedly connected with the first heat conduction plate, the second end of each first heat conduction pipe penetrates through the plurality of sub-fins, and the side wall of the second end of each first heat conduction pipe is fixedly connected with the plurality of sub-fins.
5. The optical engine of claim 4, wherein when the optical engine further comprises at least one heat sink module, the at least one heat sink module comprises a heat sink fan that provides an airflow that is parallel to the planar direction of any of the sub-fins.
6. The optical engine of claim 4, wherein each first heat pipe is a right angle bend.
7. A light engine as recited in claim 3, wherein said heat sink further comprises a second thermally conductive plate;

   the side wall of the optical machine shell is provided with heat dissipation holes, the second heat conduction plate covers the heat dissipation holes and is fixedly connected with the optical machine shell, and the first heat dissipation fins are fixedly connected to the second heat conduction plate;

   the second heat-conducting plate is configured to absorb heat in the light machine shell so as to conduct the absorbed heat to the first radiating fin.
8. The optical engine of claim 7, wherein the second thermally conductive plate is provided with a second opening coinciding with the first opening, and the first side of the first thermally conductive plate passes through the second opening and the first opening in this order.
9. The optical engine of claim 7, wherein the planar orientation of the first thermally conductive plate is perpendicular to the planar orientation of the second thermally conductive plate.
10. The optical engine of claim 1, wherein the opto-mechanical system further comprises a light baffle, the light baffle being located inside the opto-mechanical housing and connected to an end of the heat sink that extends into the opto-mechanical housing.
11. A laser projection device comprising a housing containing an optical engine as claimed in any one of claims 1 to 10.
12. The laser projection device of claim 11, wherein the light source is a three-color laser light source comprising a red laser, a blue laser, and a green laser.
13. The laser projection device of claim 11, wherein the lens is an ultra-short-focus projection lens.
14. A laser projection device as claimed in claim 11, wherein the optical device comprises a DMD digital micromirror device, and/or,

    the optical device includes a galvanometer.

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