Projection device and projection system

Abstract

The utility model provides a projection device and a projection system, and the projection device comprises a housing which is provided with an air inlet and an air outlet, and the air inlet and the air outlet are located at the two opposite sides of the housing respectively; the optical unit is arranged in the shell, the optical unit comprises a laser, and the laser is used for emitting laser beams; and the heat dissipation unit comprises at least two radiators, the at least two radiators are attached to the laser, and at least parts of the at least two radiators are stacked in the first direction and located at the air outlet. The size of the heat dissipation unit is reduced, and meanwhile heat of the optical unit can be dissipated in time.

Description

Technical Field

[0001] This application relates to the field of projection technology, and particularly to a projection device and a projection system. Background Art

[0002] With the continuous development of society, people's pursuits are also constantly changing. For laser TVs, the portability and simplicity of the screen have become one of the pursuit indicators. Therefore, the laser screen needs to be more portable, simpler, and faster to achieve stable coordinated development with the market.

[0003] Currently, among the various key technologies of laser projection, the solution to the heat dissipation problem is an extremely crucial technology. The heat dissipation problem of the laser directly affects its service life, leading to a rapid increase in the temperature of the laser, which in turn causes the optical power attenuation of the laser and even burns out the laser. In addition to the laser, as the most important Digital Micromirror Device (DMD) in the optical engine component, it will receive the light beam from the laser during operation and also generate a large amount of heat. If the heat of the DMD cannot be dissipated in time, the micromirrors on it will be damaged, resulting in bad pixels in the image. For the main board and chips in laser projection products, which are responsible for implementing various functions and information exchanges in the product, when they overheat, temperature-related devices will fail.

[0004] The foregoing description is provided to give general background information and does not necessarily constitute prior art. Summary of the Utility Model

[0005] The main purpose of this application is to provide a projection device and a projection system that can dissipate the heat of the optical unit in time while reducing the volume of the heat dissipation unit.

[0006] To achieve the above object, in a first aspect, this application provides a projection device, including:

[0007] A housing having an air inlet and an air outlet, the air inlet and the air outlet being located on opposite sides of the housing respectively;

[0008] An optical unit disposed in the housing, the optical unit including a laser for emitting a laser beam;

[0009] A heat dissipation unit including at least two radiators, at least two radiators being attached to the laser, at least a part of the at least two radiators being stacked in a first direction and located at the air outlet.

[0010] The beneficial effects of the present application are as follows: By setting at least two independent radiators, the lasers can be cooled separately. Compared with using a single large radiator, it is easier to install. In addition, the radiators are arranged at the air outlet, and at least part of them are stacked vertically. While facilitating installation, it also reduces the length of the heat pipes of the heat dissipation unit, improves the heat transfer efficiency, increases the utilization rate of the heat dissipation space, and enables the heat of the optical unit to be dissipated in time while reducing the volume of the heat dissipation unit.

[0011] Based on the above technical solutions, the present application can be further improved as follows.

[0012] In some alternative embodiments, at least two radiators include a first radiator and a second radiator. At least part of the first radiator and the second radiator are spaced apart along a first direction and are clamped on the upper and lower sides of the laser.

[0013] In some alternative embodiments, the first radiator includes a first heat dissipation plate, and the second radiator includes a second heat dissipation plate. The first heat dissipation plate and the second heat dissipation plate are stacked, and a stacking space is formed in the first direction. Both the first heat dissipation plate and the second heat dissipation plate extend along a second direction;

[0014] The laser includes a first laser and a second laser. The first heat dissipation plate is attached to the top of the first laser, and the second heat dissipation plate is attached to the bottom of the second laser, so that the first laser and the second laser are located in the stacking space.

[0015] In some alternative embodiments, the first radiator further includes a first heat dissipation fin and a first heat dissipation pipe. The first heat dissipation pipe is connected between the first heat dissipation fin and the first heat dissipation plate;

[0016] The second radiator further includes a second heat dissipation fin and a second heat dissipation pipe. The second heat dissipation pipe is connected between the second heat dissipation fin and the second heat dissipation plate, and the first heat dissipation fin is attached above the second heat dissipation fin.

[0017] In some alternative embodiments, there are two first heat dissipation fins, two first heat dissipation pipes, two second heat dissipation fins, and two second heat dissipation pipes. The two first heat dissipation fins are respectively located on opposite sides of the first heat dissipation plate along a third direction, and the two second heat dissipation fins are respectively located on opposite sides of the second heat dissipation plate along the third direction;

[0018] Wherein, the first direction, the second direction, and the third direction form an angle with each other.

[0019] In some alternative embodiments, the optical unit further includes an optical machine, and the optical machine is used to receive the laser beam emitted by the laser;

[0020] At least two radiators further include a third radiator. The third radiator is attached to the optical machine and is used to dissipate heat from the optical machine.

[0021] In some alternative embodiments, the third heat sink includes a third heat dissipation plate, third heat dissipation fins, and a third heat dissipation tube. The third heat dissipation plate is attached to the optical engine, the third heat dissipation fins are disposed on a part of the second heat sink, and the third heat dissipation tube is connected between the third heat dissipation fins and the third heat dissipation plate.

[0022] In some alternative embodiments, the air outlet includes a first air outlet and a second air outlet, and the first air outlet and the second air outlet are spaced apart in the third direction;

[0023] The heat dissipation unit further includes a first fan and a second fan. The first fan is disposed at the first air outlet and is located between the first air outlet and at least a part of the first heat sink, and the second fan is disposed at the second air outlet and is located between the second air outlet and at least a part of the first heat sink.

[0024] In a second aspect, the present application further provides a projection device, including:

[0025] A housing having an air outlet;

[0026] A laser for emitting a laser beam;

[0027] At least two heat sinks, at least a part of at least two heat sinks are disposed on opposite sides of the laser in a first direction and are located at the air outlet to dissipate heat from the laser.

[0028] In a third aspect, the present application further provides a projection system, including a projection screen and the above-mentioned projection device, and the projection device is configured to project a projection image onto the projection screen.

[0029] The projection device and the projection system provided by the present application, the projection system includes a projection device and a projection screen, and the projection device is configured to project a projection image onto the projection screen; wherein, the projection device includes: a housing having an air inlet and an air outlet, the air inlet and the air outlet are respectively located on opposite sides of the housing; an optical unit disposed in the housing, the optical unit includes a laser for emitting a laser beam; a heat dissipation unit including at least two heat sinks, at least two heat sinks are attached to the laser, at least a part of at least two heat sinks are stacked in a first direction and are located at the air outlet.

[0030] By providing at least two independent heat sinks, the laser can be dissipated heat separately. Compared with using a single large heat sink, it is convenient for installation; in addition, the heat sinks are disposed at the air outlet and at least a part of them are stacked up and down. While being convenient for installation, it also reduces the heat pipe length of the heat dissipation unit, improves the heat transfer efficiency, increases the utilization rate of the heat dissipation space, and enables the heat of the optical unit to be dissipated in time while reducing the volume of the heat dissipation unit. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0032] Figure 1 Structural schematic diagram of the projection device provided by the embodiment of the present application from the first perspective;

[0033] Figure 2 Structural schematic diagram of the projection device provided by the embodiment of the present application from the second perspective;

[0034] Figure 3 Structural schematic diagram of the optical unit in the projection device provided by the embodiment of the present application from the first perspective;

[0035] Figure 4 Structural schematic diagram of the optical unit in the projection device provided by the embodiment of the present application from the second perspective;

[0036] Figure 5 Structural schematic diagram of the optical unit in the projection device provided by the embodiment of the present application from the third perspective;

[0037] Figure 6 Structural schematic diagram of the heat dissipation unit in the projection device provided by the embodiment of the present application;

[0038] Figure 7 Structural schematic diagram of the first radiator in the heat dissipation unit provided by the embodiment of the present application from the first perspective;

[0039] Figure 8 Structural schematic diagram of the first radiator in the heat dissipation unit provided by the embodiment of the present application from the second perspective;

[0040] Figure 9 Structural schematic diagram of the second radiator in the heat dissipation unit provided by the embodiment of the present application from the first perspective;

[0041] Figure 10 Structural schematic diagram of the second radiator in the heat dissipation unit provided by the embodiment of the present application from the second perspective;

[0042] Figure 11 Structural schematic diagram of the third radiator in the heat dissipation unit provided by the embodiment of the present application.

[0043] Explanation of reference numerals:

[0044] 100 - Projection device; 110 - Housing; 111 - Air inlet; 112 - Air outlet; 1121 - First air outlet; 1122 - Second air outlet;

[0045] 120 - Optical unit; 121 - Laser; 1211 - First laser; 1212 - Second laser; 122 - Optical engine; 123 - Lens;

[0046] 130 - Heat dissipation unit; 131 - First radiator; 1311 - First heat dissipation plate; 1312 - First heat dissipation fins; 1313 - First heat dissipation pipe; 132 - Second radiator; 1321 - Second heat dissipation plate; 1322 - Second heat dissipation fins; 1323 - Second heat dissipation pipe; 133 - Third radiator; 1331 - Third heat dissipation plate; 1332 - Third heat dissipation fins; 1333 - Third heat dissipation pipe; 134 - First fan; 135 - Second fan. Detailed implementation manners

[0047] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application. All other embodiments obtained shall fall within the scope of protection of this application. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0048] In this application, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected to", "fixed" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application may be understood according to specific circumstances.

[0049] In this application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0050] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0051] Currently, among various key technologies of laser projection, the solution to the heat dissipation problem is an extremely crucial technology. The heat dissipation problem of the laser directly affects its service life, leading to a rapid increase in the temperature of the laser, thereby causing the optical power attenuation of the laser, or even burning out the laser. In addition to the laser, as the most important Digital Micromirror Device (DMD) in the optical engine component, it will receive the light beam from the laser during operation and also generate a large amount of heat. If the heat of the DMD cannot be dissipated in time, the micromirror on it will be damaged, and then bad pixels will appear in the image. The main board and chip in the laser projection product are responsible for realizing various functions and information exchanges in the product. When they are overheated, it will cause the failure of temperature-related devices.

[0052] In order to overcome the defects in the prior art, the projection device and projection system provided in this application can dissipate heat from the laser separately through at least two independent heat sinks. Compared with using a whole large heat sink, it is convenient for installation. In addition, the heat sink is arranged at the air outlet, and at least part of them are stacked up and down. While being convenient for installation, it also reduces the heat pipe length of the heat dissipation unit, improves the heat transfer efficiency, increases the utilization rate of the heat dissipation space, and enables the heat of the optical unit to be dissipated in time while reducing the volume of the heat dissipation unit.

[0053] The following will describe the content of the present application in detail with reference to the accompanying drawings, so that those skilled in the art can understand the content of the present application more clearly and in detail.

[0054] Figure 1 It is a schematic structural diagram of the first perspective of the projection device provided in the embodiment of the present application. Figure 2 It is a schematic structural diagram of the second perspective of the projection device provided in the embodiment of the present application. Figure 3 It is a schematic structural diagram of the first perspective of the optical unit in the projection device provided in the embodiment of the present application. Figure 4 It is a schematic structural diagram of the second perspective of the optical unit in the projection device provided in the embodiment of the present application. Figure 5 It is a schematic structural diagram of the third perspective of the optical unit in the projection device provided in the embodiment of the present application.

[0055] As Figures 1 to 5 shown, the embodiment of the present application provides a projection device 100, including:

[0056] A housing 110, the housing 110 has an air inlet 111 and an air outlet 112, and the air inlet 111 and the air outlet 112 are respectively located on opposite sides of the housing 110;

[0057] An optical unit 120, the optical unit 120 is arranged in the housing 110, and the optical unit 120 includes a laser 121, and the laser 121 is used to emit a laser beam;

[0058] A heat dissipation unit 130, the heat dissipation unit 130 includes at least two radiators, at least two radiators are attached to the laser 121, at least part of the at least two radiators are stacked in a first direction, and are located at the air outlet 112.

[0059] Through the above settings, that is, through the setting of at least two independent radiators, the laser 121 can be dissipated separately. Compared with using a whole large radiator, it is convenient for installation; in addition, the radiator is arranged at the air outlet 112, and at least part of it is stacked up and down. While being convenient for installation, it also reduces the heat pipe length of the heat dissipation unit 130, improves the heat transfer efficiency, increases the utilization rate of the heat dissipation space, and enables the heat of the optical unit 120 to be dissipated in time while reducing the volume of the heat dissipation unit 130.

[0060] Specifically, when the present application realizes the same heat dissipation power, the heat dissipation utilization volume is reduced by at least 20%, saving the cost of the heat dissipation unit 130. At the same time, the split heat dissipation design can reduce the installation difficulty, reduce the risk of deformation during installation, and improve the product reliability.

[0061] It should be noted that the following will specifically describe each structure.

[0062] [Housing 110]

[0063] It should be noted that the housing 110 is used to mount the optical unit 120, and the accommodation space of the housing 110 is slightly larger than the external dimensions of the optical unit 120.

[0064] In some examples, the housing 110 can be a metal part, and its material can include one or more of copper, iron, aluminum, tin, and lead.

[0065] In some other examples, the housing 110 can be made of plastic.

[0066] It should be noted that the specific material of the housing 110 is not overly restricted in the embodiments of this application.

[0067] Of course, during production and manufacturing, on the premise of ensuring strength, the housing 110 can also be made of steel plates, plastics, or composite materials.

[0068] In some embodiments, the air inlet 111 and the air outlet 112 are arranged on opposite sides of the housing 110 along the second direction.

[0069] Such as Figure 1 shown, Y represents the second direction, where the second direction can be the length direction of the projection device 100.

[0070] [Optical unit 120]

[0071] It should be noted that according to the optical functional parts, the optical unit 120 includes a laser 121, an optical engine 122, and a lens 123 assembled in the overall machine housing 110. These optical parts are sequentially connected along the light beam propagation direction, and each has a corresponding housing 110 for wrapping to support the optical components and meet certain sealing or airtight requirements for each optical part. Among them, the optical engine 122 and the lens 123 are connected and arranged along the third direction of the overall machine, where Z represents the third direction. For example, the third direction can be the width direction of the projection device 100, or according to the usage mode, the third direction is opposite to the direction in which the user views. A laser 121 is arranged in the space enclosed by the optical engine 122, the lens 123, and a part of the overall machine housing 110. The laser 121 is a pure three-color laser light source that emits red laser, blue laser, and green laser. The laser 121, the optical engine 122, and the lens 123 are arranged in an L shape.

[0072] It should be noted that the projection device 100 is a device that can generate an image screen with laser and project it onto a screen. The projection device 100 includes a laser 121. When the laser 121 emits laser, it will generate heat, causing the temperature of the laser 121 to rise.

[0073] When the projection device 100 is operating, the components in the projection device 100 generate heat, resulting in a relatively high operating temperature of the projection device 100. In addition, the ambient temperature can also affect the temperature of the laser 121. When the ambient temperature is high, the temperature of the laser 121 increases accordingly. When the temperature of the laser 121 is too high, it will affect the light-emitting efficiency of the laser 121 and shorten the service life of the laser 121. Furthermore, the excessively high operating temperature will affect the service life of the projection device 100. Therefore, when the projection device 100 is running, the heat dissipation unit 130 can be used to dissipate heat from the projection device 100 to stabilize the light-emitting efficiency of the laser 121.

[0074] In the projection device 100, the light source is the main heat source, and the high-density energy beam of the laser 121 irradiating on the surface of the optical lens will also generate heat. On the one hand, the laser 121 has a set operating temperature to form a stable light output, taking into account the service life and performance. At the same time, the device contains multiple precision optical lenses inside, especially the ultra-short focal length lens 123 contains multiple lenses. If the temperature inside the entire device is too high and heat accumulates, it will cause the phenomenon of "temperature drift" of the lenses inside the lens 123, and the imaging quality will deteriorate severely. Also, components such as circuit board devices are driven by electrical signals and will also generate a certain amount of heat, and each electronic device also has a set operating temperature. Therefore, good heat dissipation and temperature control are very important guarantees for the normal operation of the projection device 100.

[0075] [Heat dissipation unit 130]

[0076] It should be noted that on both sides of the housing 110 in the projection device 100, there are an air inlet 111 and an air outlet 112 respectively. At least two radiators fixed inside the housing 110 are used to dissipate heat from the corresponding optical components to be cooled. In this way, the heat generated by the optical components to be cooled inside the housing 110 during operation can be absorbed by the corresponding radiators. Thus, when the cold air passes through each radiator, it can take away the heat at each radiator. These heats can be dissipated to the external environment through the air outlet 112 on the housing 110, ensuring a good heat dissipation effect for the optical components to be cooled.

[0077] In addition, at least two radiators can be closely stacked up and down. The installation of this split-type radiator is more convenient and fast, and at the same time, it can effectively reduce the risk of deformation during the installation of the radiator.

[0078] Figure 6 The structural schematic diagram of the heat dissipation unit in the projection device provided by the embodiment of the present application is as Figures 1 to 6 shown. In some alternative embodiments, at least two radiators include a first radiator 131 and a second radiator 132. At least a part of the first radiator 131 and the second radiator 132 are spaced along the first direction and are clamped on the upper and lower sides of the laser 121.

[0079] It should be noted that the first direction can be the height direction of the projection device 100, where, as Figure 1 shown, X represents the first direction.

[0080] In addition, by arranging them vertically at intervals, the space of the housing 110 can be better utilized, and while ensuring effective heat dissipation of the laser 121, miniaturization of the projection device 100 can be achieved.

[0081] Figure 7 It is a schematic structural view of the first radiator from the first perspective in the heat dissipation unit provided by the embodiment of the present application. Figure 8 It is a schematic structural view of the first radiator from the second perspective in the heat dissipation unit provided by the embodiment of the present application. Figure 9 It is a schematic structural view of the second radiator from the first perspective in the heat dissipation unit provided by the embodiment of the present application. Figure 10 It is a schematic structural view of the second radiator from the second perspective in the heat dissipation unit provided by the embodiment of the present application.

[0082] As Figures 6 to 10 shown, in some alternative embodiments, the first radiator 131 includes a first heat dissipation plate 1311, the second radiator 132 includes a second heat dissipation plate 1321, the first heat dissipation plate 1311 and the second heat dissipation plate 1321 are stacked, and a stacked space is formed in the first direction. Both the first heat dissipation plate 1311 and the second heat dissipation plate 1321 extend along the second direction;

[0083] The laser 121 includes a first laser 1211 and a second laser 1212. The first heat dissipation plate 1311 is attached to the top of the first laser 1211, and the second heat dissipation plate 1321 is attached to the bottom of the second laser 1212, so that the first laser 1211 and the second laser 1212 are located in the stacked space.

[0084] It should be noted that the first laser 1211 extends along the second direction. Among them, the first heat dissipation plate 1311 is attached to the top of the first laser 1211 and extends along the second direction, and the heat of the first laser 1211 can be better conducted to the first heat dissipation plate 1311.

[0085] Correspondingly, the second laser 1212 extends along the second direction. Among them, the second heat dissipation plate 1321 is attached to the bottom of the second laser 1212 and extends along the second direction, and the heat of the second laser 1212 can be better conducted to the second heat dissipation plate 1321.

[0086] In addition, along the first direction, from top to bottom in sequence are: the first heat dissipation plate 1311, the first laser 1211, the second laser 1212, and the second heat dissipation plate 1321. That is to say, the first heat dissipation plate 1311 and the second heat dissipation plate 1321 are respectively located on the sides of the first laser 1211 and the second laser 1212, clamped on both sides of the first laser 1211 and the second laser 1212, which can not only make better use of the space of the housing 110, but also conduct heat and dissipate heat better.

[0087] In some embodiments, the first heat dissipation plate 1311 can be a first copper substrate, and the second heat dissipation plate 1321 can be a second copper substrate. Using copper material can make the heat conduction effect better.

[0088] As Figures 6 to 10 shown, in some optional embodiments, the first heat sink 131 further includes a first heat dissipation fin 1312 and a first heat dissipation tube 1313, and the first heat dissipation tube 1313 is connected between the first heat dissipation fin 1312 and the first heat dissipation plate 1311;

[0089] The second heat sink 132 further includes a second heat dissipation fin 1322 and a second heat dissipation tube 1323, and the second heat dissipation tube 1323 is connected between the second heat dissipation fin 1322 and the second heat dissipation plate 1321, and the first heat dissipation fin 1312 is attached above the second heat dissipation fin 1322.

[0090] By utilizing the heat conduction principle of the first heat dissipation tube 1313 and the rapid heat transfer property of the phase change medium, the heat of the first laser 1211 is quickly transferred outside the heat source; by utilizing the heat conduction principle of the second heat dissipation tube 1323 and the rapid heat transfer property of the phase change medium, the heat of the second laser 1212 is quickly transferred outside the heat source.

[0091] It should be noted that by contacting the first heat dissipation plate 1311 with the first laser 1211, the heat generated when the first laser 1211 works can be conducted to the first heat dissipation fin 1312 through the first heat dissipation plate 1311 and the first heat dissipation tube 1313 in sequence, so that the working temperature of the first laser 1211 is relatively low, effectively ensuring the service life of the first laser 1211. The heat at the first heat dissipation fin 1312 can be dissipated through the air outlet 112.

[0092] In this application, the first heat sink 131 can be a fin heat sink, and the first heat dissipation plate 1311 can be a copper plate, so that the heat generated when the first laser 1211 works can be conducted out in time.

[0093] It should be noted that by contacting the second heat sink 1321 with the second laser 1212, the heat generated when the second laser 1212 operates can be conducted to the second heat sink fins 1322 through the second heat sink 1321 and the second heat pipe 1323 in sequence, so that the operating temperature of the second laser 1212 is relatively low, effectively ensuring the service life of the second laser 1212. The heat at the second heat sink fins 1322 can be dissipated through the air outlet 112.

[0094] In the present application, the second heat sink 132 can be a fin heat sink, and the second heat sink plate 1321 can be a copper plate, so that the heat generated when the second laser 1212 operates can be conducted out in time.

[0095] The structure of the first heat pipe 1313 can be the same as that of the second heat pipe 1323, which will not be elaborated here.

[0096] In some embodiments, the number of the first heat pipes 1313 inserted into the first heat sink fins 1312 is the same as the number of the second heat pipes 1323 inserted into the second heat sink fins 1322.

[0097] In some embodiments, since the first heat pipe 1313 is a closed system with liquid inside, the heat conduction is achieved through the gas-liquid change of the liquid.

[0098] A plurality of through holes are formed in both the first heat sink fins 1312 and the first heat sink plate 1311 for inserting a plurality of the first heat pipes 1313.

[0099] The first heat pipe 1313 can be bent according to the positions of the first heat sink fins 1312 and the first heat sink plate 1311 to better match the space inside the housing 110, which is beneficial to reducing the transmission resistance during the gas-liquid change inside the first heat pipe 1313, beneficial to improving the heat conduction efficiency, and making the assembled volume more compact.

[0100] In some embodiments, specifically, multiple first heat dissipation tubes 1313 are inserted into the first heat dissipation fins 1312, and the evaporation ends of the first heat dissipation tubes 1313 are communicated with the first heat dissipation plate 1311. Thus, the inner cavity of the first heat dissipation plate 1311 is communicated with the evaporation ends of the first heat dissipation tubes 1313, forming a flat evaporation cavity inside the first heat dissipation plate 1311. The phase change material flowing inside the first heat dissipation tubes 1313 can also enter the first heat dissipation plate 1311. When entering the heat exchange, the liquid inside the first heat dissipation plate 1311 absorbs the heat of the first laser 1211 and changes from liquid to gas, which is transmitted to the condensation ends of the first heat dissipation tubes 1313. The condensation ends of the first heat dissipation plate 1311 and the first heat dissipation fins 1312 are connected by welding. The gas inside the condensation ends of the first heat dissipation tubes 1313 is cooled and becomes liquid. Through the capillary action of the internal pipes of the first heat dissipation plate 1311, the liquid returns to the communication cavity formed by the evaporation ends and the first heat dissipation plate 1311 again, and absorbs heat again through the liquid-gas change, so as to cool the first laser 1211 in a cyclic manner.

[0101] It should be noted that the structures and working principles of the second heat dissipation tubes 1323, the second heat dissipation fins 1322, and the second heat dissipation plate 1321 can refer to the above-mentioned first heat dissipation tubes 1313, the first heat dissipation fins 1312, and the first heat dissipation plate 1311, and will not be elaborated here specifically.

[0102] In specific implementation, the single-piece thickness of the first heat dissipation fins 1312 can be 0.4 mm - 0.6 mm, and the fin pitch is 1.5 mm - 2.5 mm, which is conducive to the air flow passing through the fins to take away the heat.

[0103] As Figures 6 to 10 shown, in some alternative embodiments, there are two first heat dissipation fins 1312, two first heat dissipation tubes 1313, two second heat dissipation fins 1322, and two second heat dissipation tubes 1323. The two first heat dissipation fins 1312 are respectively located on the opposite sides of the first heat dissipation plate 1311 along the third direction, and the two second heat dissipation fins 1322 are respectively located on the opposite sides of the second heat dissipation plate 1321 along the third direction;

[0104] Among them, the first direction, the second direction, and the third direction form an angle with each other.

[0105] It should be noted that the first radiator 131 and the second radiator 132 are closely stacked up and down. The installation of this split-type dual-laser 121 radiator is more convenient and fast, and at the same time, the deformation risk during the installation of the radiator can be effectively reduced.

[0106] In addition, with such a setting, the heat of the first laser 1211 can be better dissipated through the two air outlets 112, avoiding heat concentration and improving the heat dissipation efficiency. Similarly, the heat dissipation effect of the second radiator 132 is the same.

[0107] Figure 11 This is a schematic structural diagram of the third radiator in the heat dissipation unit provided by the embodiments of the present application. As Figures 6 to 11 shown, in some alternative embodiments, the optical unit 120 further includes an optical engine 122, and the optical engine 122 is configured to receive the laser beam emitted by the laser 121;

[0108] At least two radiators further include a third radiator 133, and the third radiator 133 is attached to the optical engine 122 and is configured to dissipate heat from the optical engine 122.

[0109] It should be noted that, according to the optical functional parts, it is divided into a laser 121, an optical engine 122, and a lens 123. The laser 121 includes a red laser 121, a blue laser 121, a green laser 121, and a plurality of optical lenses. The plurality of optical lenses perform homogenization and focusing processing on the laser beam. The beam emitted from the laser 121 is incident on the optical engine 122. Usually, an optical waveguide is located at the front end of the optical engine 122 and is configured to receive the illumination beam of the light source first. The optical waveguide has the functions of light mixing and homogenization, and the outlet of the optical waveguide is rectangular, which has a shaping effect on the light spot.

[0110] The optical engine 122 includes a Digital Micromirror Device (DMD) chip. The DMD chip includes a plurality of micromirrors, and imaging is achieved by flipping the micromirrors. In an ultra-short throw projection device, the lens 123 is an ultra-short throw projection lens 123, which usually includes a refractive lens group and a reflective lens group and is configured to achieve a small projection ratio, such as less than 0.3.

[0111] It should be noted that the DMD chip has an area of only a few tenths of an inch, but it needs to withstand the beam energy required for the entire projected image, and its heat generation is also very high. Therefore, the third radiator 133 is used to dissipate heat from the DMD chip.

[0112] As Figures 6 to 11 shown, in some alternative embodiments, the third radiator 133 includes a third heat dissipation plate 1331, third heat dissipation fins 1332, and a third heat dissipation tube 1333. The third heat dissipation plate 1331 is attached to the optical engine 122, the third heat dissipation fins 1332 are disposed on a part of the second radiator 132, and the third heat dissipation tube 1333 is connected between the third heat dissipation fins 1332 and the third heat dissipation plate 1331.

[0113] It should be noted that by bringing the third heat dissipation plate 1331 into contact with the optical engine 122, the heat generated during the operation of the DMD can be sequentially and timely conducted to the third heat dissipation fin 1332 through the third heat dissipation plate 1331 and the third heat dissipation pipe 1333, so that the operating temperature of the optical engine 122 is relatively low, which can ensure that the heat generated during the operation of the DMD is timely dissipated, effectively ensuring the service life of the optical engine 122.

[0114] In addition, the third heat sink 133 adopts a heat pipe heat sink solution instead of a general aluminum profile heat sink, because in this way, the heat conduction principle of the heat pipe and the rapid heat transfer property of the phase change medium can be fully utilized to quickly transfer the heat of the heat-generating object outside the heat source. At the same time, the third heat dissipation pipe 1333 conforms to the direction of gravity, which can maximize the heat transfer efficiency of the heat pipe. The third heat dissipation fin 1332 is close to the first heat dissipation fin 1312 and the second heat dissipation fin 1322, making full use of the cooling air flow, and the miniaturization of the third heat sink 133 can be maximally achieved while meeting the cooling requirements.

[0115] In some alternative embodiments, the air outlet 112 includes a first air outlet 1121 and a second air outlet 1122, and the first air outlet 1121 and the second air outlet 1122 are spaced apart in the third direction;

[0116] The heat dissipation unit 130 further includes a first fan 134 and a second fan 135. The first fan 134 is disposed at the first air outlet 1121 and is located between the first air outlet 1121 and at least a part of the first heat sink 131. The second fan 135 is disposed at the second air outlet 1122 and is located between the second air outlet 1122 and at least a part of the first heat sink 131.

[0117] It should be noted that the air in the external environment enters the interior of the housing 110 from the air inlet 111, first passes through the electronic system including the main board and the laser 121 and dissipates heat from them, and then passes through the optical engine 122. The heat dissipation fins on these heat source contact surfaces can share some of the heat dissipation pressure. At the same time, at the optical engine 122, the air path is divided into two paths, and the wind directions are respectively towards the first fan 134 and the second fan 135.

[0118] The heat of the DMD is mainly transferred by the third heat dissipation pipe 1333 to the third heat dissipation fin 1332 welded to the third heat dissipation pipe 1333, and then taken away by the heat dissipation air flow. The heat of the first laser 1211 is transferred by the first heat dissipation pipe 1313 to the first heat dissipation fin 1312 welded to the first heat dissipation pipe 1313. The heat of the second laser 1212 is transferred by the second heat dissipation pipe 1323 to the second heat dissipation fin 1322 welded to the second heat dissipation pipe 1323. After the heat dissipation air flow passes through the third heat sink 133, it immediately passes through the first heat sink 131 and the second heat sink 132, and finally the heat dissipation air flow is discharged through the first fan 134 and the second fan 135, realizing the heat dissipation of the whole machine system.

[0119] It should be noted that the first heat sink 131, the second heat sink 132 and the third heat sink 133 are all tightly stacked at the air outlet 112 to ensure that the air flow can quickly dissipate after taking away the heat of the first heat dissipation fin 1312, the second heat dissipation fin 1322 and the third heat dissipation fin 1332, so that the heat dissipation process of the entire projection device 100 can continue.

[0120] In this way, the cold air can take away the heat at each heat sink when passing through each heat sink. These heats can be dissipated to the external environment through the air outlet 112 on the housing 110, that is, the first fan 134 can simultaneously dissipate heat from the optical components to be cooled (such as the laser 121 and the DMD). In this way, it is ensured that the heat dissipation effect of the optical components to be cooled is better.

[0121] These heats can be dissipated to the external environment through the first air outlet 1121 and the second air outlet 1122, that is, the first fan 134 and the second fan 135 can simultaneously dissipate heat from the first laser 1211, the second laser 1212 and the optical engine 122 to be cooled. In this way, it is ensured that the heat dissipation effects of the first laser 1211, the second laser 1212 and the optical engine 122 are all better.

[0122] In this way, the heat generated when the optical unit 120 to be cooled in the housing 110 works can be absorbed by the corresponding heat sink, that is, the heat generated when the first laser 1211 works can be absorbed by the first heat sink 131, the heat generated when the second laser 1212 works can be absorbed by the second heat sink 132, and the heat generated when the optical engine 122 works can be absorbed by the third heat sink 133. Since the heat dissipation unit 130 is arranged at the air outlet 112, the heat accumulates at the air outlet 112, and again through the first fan 134 and the second fan 135, the heat is dissipated through the first air outlet 1121 and the second air outlet 1122 respectively. In this way, it is ensured that the heat dissipation effects of the optical units 120 to be cooled are better.

[0123] It should be noted that the first fan 134 can dissipate heat from part of the first radiator 131 or part of the second radiator 132, and the second fan 135 can dissipate heat from another part of the first radiator 131 or another part of the second radiator 132 as well as the third radiator 133.

[0124] In some embodiments, the first fan 134 can cover the first heat dissipation fins 1312 and the second heat dissipation fins 1322, and the second fan 135 can cover the first heat dissipation fins 1312 and the second heat dissipation fins 1322, both of which can achieve the purpose of allowing air flow to pass through the entire first heat dissipation fins 1312 and the second heat dissipation fins 1322.

[0125] The projection device provided by the embodiment of the present application includes: a housing having an air inlet and an air outlet, the air inlet and the air outlet are respectively located on opposite sides of the housing; an optical unit disposed in the housing, the optical unit includes a laser for emitting a laser beam; a heat dissipation unit including at least two radiators, at least two radiators are attached to the laser, at least part of at least two radiators are stacked in a first direction and are located at the air outlet.

[0126] By providing at least two independent radiators, the laser can be dissipated heat separately. Compared with using a whole large radiator, it is convenient for installation; in addition, the radiators are disposed at the air outlet and at least part of them are stacked up and down. While being convenient for installation, it also reduces the heat pipe length of the heat dissipation unit, improves the heat transfer efficiency, increases the utilization rate of the heat dissipation space, and enables the heat of the optical unit to be dissipated in time while reducing the volume of the heat dissipation unit.

[0127] In addition, as Figures 1 to 11 shown, the embodiment of the present application also provides a projection device 100, including:

[0128] A housing 110 having an air outlet 112;

[0129] A laser 121 for emitting a laser beam;

[0130] At least two radiators, in a first direction, at least part of at least two radiators are disposed on opposite sides of the laser 121 and are located at the air outlet 112 to dissipate heat from the laser 121.

[0131] The projection device provided by the embodiment of the present application can dissipate heat from the laser separately through at least two independent heat sinks. Compared with using a single large heat sink, it is easier to install. In addition, the heat sinks are arranged at the air outlet and at least partially stacked vertically. While being convenient for installation, it also reduces the heat pipe length of the heat dissipation unit, improves the heat transfer efficiency, increases the utilization rate of the heat dissipation space, and enables the heat of the optical unit to be dissipated in time while reducing the volume of the heat dissipation unit.

[0132] In addition, the embodiment of the present application also provides a projection system, including a projection screen and the above-mentioned projection device 100. The projection device 100 is used to project a projection image onto the projection screen.

[0133] Among them, the specific structure, working principle, and function of the projection device 100 have been described in detail in the foregoing Embodiment 1, and will not be elaborated here.

[0134] Specifically, in the projection system of this embodiment, the projection device 100 can be various existing projectors, such as a laser projector. The projection device 100 can project a projection image onto the display film of the projection screen, so that the display film can display the projection image for people to watch.

[0135] The projection device provided by the embodiment of the present application can dissipate heat from the laser separately through at least two independent heat sinks. Compared with using a single large heat sink, it is easier to install. In addition, the heat sinks are arranged at the air outlet and at least partially stacked vertically. While being convenient for installation, it also reduces the heat pipe length of the heat dissipation unit, improves the heat transfer efficiency, increases the utilization rate of the heat dissipation space, and enables the heat of the optical unit to be dissipated in time while reducing the volume of the heat dissipation unit.

[0136] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0137] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although the technical solutions of this application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A projection device, characterized in that: include: A shell, wherein the shell has an air inlet and an air outlet, and the air inlet and the air outlet are respectively located on opposite sides of the shell; An optical unit, the optical unit is arranged in the housing, the optical unit comprises a laser, and the laser is used to emit a laser beam; The heat dissipation unit comprises at least two heat sinks, at least two of the heat sinks are attached to the laser, and at least part of the at least two heat sinks are stacked in a first direction and located at the air outlet.

2. The projection device according to claim 1, characterized in that: The at least two heat sinks include a first heat sink and a second heat sink, and at least parts of the first heat sink and the second heat sink are arranged at intervals along the first direction and clamped on the upper and lower sides of the laser.

3. The projection device according to claim 2, characterized in that: The first heat sink includes a first heat sink, the second heat sink includes a second heat sink, the first heat sink and the second heat sink are stacked to form a stacking space in the first direction, and the first heat sink and the second heat sink both extend along the second direction; The laser includes a first laser and a second laser. The first heat sink is attached to the top of the first laser, and the second heat sink is attached to the bottom of the second laser, so that the first laser and the second laser are located in the stacking space.

4. The projection device according to claim 3, characterized in that: The first radiator further includes a first radiating fin and a first radiating pipe, wherein the first radiating pipe is connected between the first radiating fin and the first radiating plate; The second radiator further includes a second radiating fin and a second radiating pipe, the second radiating pipe is connected between the second radiating fin and the second radiating plate, and the first radiating fin is attached above the second radiating fin.

5. The projection device according to claim 4, characterized in that: There are two of each of the first heat dissipation fin, the first heat dissipation tube, the second heat dissipation fin, and the second heat dissipation tube, the two first heat dissipation fins are respectively located on two opposite sides of the first heat dissipation plate along the third direction, and the two second heat dissipation fins are respectively located on two opposite sides of the second heat dissipation plate along the third direction; The first direction, the second direction and the third direction have an angle with each other.

6. The projection device according to any one of claims 2 to 5, characterized in that: The optical unit further comprises an optical machine, which is used to receive the laser beam emitted by the laser; At least two of the heat sinks further include a third heat sink, and the third heat sink is attached to the optical engine and is used to dissipate heat for the optical engine.

7. The projection device according to claim 6, characterized in that: The third radiator includes a third radiator plate, third radiator fins and a third radiator tube. The third radiator plate is attached to the optical machine, the third radiator fins are arranged on part of the second radiator, and the third radiator tube is connected between the third radiator fins and the third radiator plate.

8. The projection device according to any one of claims 2 to 5, characterized in that: The air outlet comprises a first air outlet and a second air outlet, wherein the first air outlet and the second air outlet are spaced apart in the third direction; The heat dissipation unit also includes a first fan and a second fan, the first fan is arranged at the first air outlet and is located between the first air outlet and at least a portion of the first radiator, and the second fan is arranged at the second air outlet and is located between the second air outlet and at least a portion of the first radiator.

9. A projection device, characterized in that: include: A housing having an air outlet; A laser, wherein the laser is used to emit a laser beam; At least two heat sinks, in a first direction, at least a portion of the at least two heat sinks are disposed on opposite sides of the laser and located at the air outlet to dissipate heat for the laser.

10. A projection system, characterized in that: It comprises a projection screen and the projection device according to any one of claims 1 to 9, wherein the projection device is used to project a projection picture onto the projection screen.

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