Projector ray machine and projector

Abstract

A projector ray machine (100) and a projector. The projector light machine (100) comprises a shell (1), a light source (2), a first Fresnel lens (4), heat insulation glass (5), a light valve (6), a heat dissipation module (9) and an internal circulation fan (10). A light channel (14) for light rays of the light source (2) to pass through is formed in the shell (1), and the first Fresnel lens (4), the heat insulation glass (5) and the light valve (6) are sequentially arranged in the light channel (14) at intervals in the light emitting direction of the light source (2). The heat dissipation module (9) is arranged outside the shell (1) and located on one side of the first Fresnel lens (4), the heat insulation glass (5) and the light valve (6). Wherein the light valve (6), the heat insulation glass (5) and the inner wall of the light channel (14) define a first air channel (20), the heat insulation glass (5), the first Fresnel lens (4) and the inner wall of the light channel (14) define a second air channel (30), and a mounting cavity (40) is formed in the heat dissipation module (9); and the internal circulation fan (10) is arranged in the mounting cavity (40).

Description

Projector Optical Engine and Projector Technical Field

[0001] This application relates to the field of optical projection equipment technology, and in particular to a projector optical engine and a projector using the projector optical engine. Background Technology

[0002] A projector is a device that projects images or videos onto a screen. It can be connected to computers, game consoles, and other devices through different interfaces to play corresponding video signals. The projector's optical engine integrates the display chip, light source, heat dissipation module, and other components, making it the most crucial part of the projector.

[0003] Currently, in a common design, the projector optical engine includes an external housing and internal components such as a light-emitting diode (LED) lamp board, reflector, rear Fresnel lens, heat-insulating glass, liquid crystal display (LCD), front Fresnel lens, and projection lens. The LED lamp board, reflector, rear Fresnel lens, and heat-insulating glass form the projector's light source module. The LCD displays images, and the projection lens and front Fresnel lens project and magnify the image displayed on the LCD. Understandably, the LCD accumulates considerable heat during normal operation of the projector optical engine; therefore, a corresponding heat dissipation module is required to cool the LCD.

[0004] However, among the aforementioned projector optical engines, the heat dissipation effect of the LCD heat dissipation solution is still relatively poor.

[0005] Summary of the Invention

[0006] This application provides a projector optical engine and a projector that can improve the heat dissipation effect of the light valve, thereby improving the performance of the projector.

[0007] On one hand, this application provides a projector optical engine, including a housing, a light source, a first Fresnel lens, a heat-insulating glass, a light valve, a heat dissipation module, and an internal circulation fan; a light channel for light from the light source is formed inside the housing, and the first Fresnel lens, the heat-insulating glass, and the light valve are sequentially and spaced apart in the light channel along the light emission direction of the light source; the heat dissipation module is disposed outside the housing and located on one side of the first Fresnel lens, the heat-insulating glass, and the light valve; wherein, the inner wall of the light valve, the heat-insulating glass, and the light channel defines a first air duct, and the inner wall of the heat-insulating glass, the first Fresnel lens, and the light channel defines a second air duct, a mounting cavity is formed inside the heat dissipation module, the side of the first air duct and the second air duct away from the heat dissipation module are connected, and the side of the first air duct and the second air duct facing the heat dissipation module are respectively connected to the mounting cavity; the internal circulation fan is disposed in the mounting cavity and is used to drive airflow to circulate in the first air duct, the second air duct, and the mounting cavity, so that the airflow blown out by the internal circulation fan first flows through the light-incident surface of the light valve, and then flows back to the internal circulation fan through the second air duct and the mounting cavity.

[0008] In one possible implementation, the internal circulation fan drives the airflow in the second air duct to be drawn into the mounting cavity, and then discharged into the first air duct after passing through the mounting cavity.

[0009] In one possible implementation, the housing includes an arcuate portion located on the side of the housing away from the heat dissipation module and arched toward the direction away from the heat insulation glass; an arcuate airflow channel is defined between the inner wall of the arcuate portion and the side of the heat insulation glass away from the heat dissipation module, and the sides of the first airflow channel and the second airflow channel away from the heat dissipation module are connected through the arcuate airflow channel.

[0010] In one possible implementation, a first heat dissipation fin is provided on the inner wall and / or the outer wall of the arcuate portion.

[0011] In one possible implementation, the housing has a heat-conducting port on one side corresponding to the heat dissipation module, which is connected to the optical channel. The heat dissipation module includes a duct shell and a second heat dissipation fin connected to the duct shell. An installation cavity is formed inside the duct shell. The duct shell covers the heat-conducting port and abuts against the optical valve and the first Fresnel lens.

[0012] In one possible implementation, the heat dissipation module further includes a partition assembly disposed within the air duct housing, the partition assembly dividing the mounting cavity into a connected fan cavity and an air duct cavity, the fan cavity being connected to a first air duct and the air duct cavity being connected to a second air duct; wherein, the partition assembly abuts against the side of the heat insulation glass facing the heat dissipation module.

[0013] In one possible implementation, the internal circulation fan is disposed within the fan cavity, and the second heat dissipation fins include an inner fin assembly disposed within the air duct cavity.

[0014] In one possible implementation, the inner fin assembly includes a plurality of spaced-apart first fin units, with an air guide channel formed between two adjacent first fin units, and the air guide channel is directed in the direction from the second air duct to the fan cavity.

[0015] In one possible implementation, the second heat dissipation fin further includes an outer fin group connected to at least a portion of the outer wall surface of the air duct housing corresponding to the fan cavity and / or the air duct cavity.

[0016] In one possible implementation, the partition assembly includes a thermally conductive partition and a fan partition abutting together, with the thermally conductive partition abutting against the heat-insulating glass; the thermally conductive partition is provided with an air outlet, and the fan partition is provided with an air inlet opposite to the air outlet, and the size of the air inlet is adapted to the air intake of the internal circulation fan.

[0017] In one possible implementation, the duct housing includes a first housing portion and a second housing portion that are interlocked with each other, a heat-conducting baffle is connected to one of the first housing portion and the second housing portion, and a fan baffle is sandwiched between the first housing portion and the second housing portion; a second heat dissipation fin is provided on the first housing portion and / or the second housing portion.

[0018] In one possible implementation, the projector optical engine provided in this application further includes a heat exchange assembly; the light source includes a lamp plate located outside the housing, and the heat exchange assembly includes a substrate and a third heat dissipation fin disposed on the substrate, the third heat dissipation fin surrounding the lamp plate and extending toward one side of the housing.

[0019] In one possible implementation, the substrate has a first end face and a second end face disposed opposite to each other; the first end face is connected to the lamp panel, and a third heat dissipation fin is disposed on the first end face; a fourth heat dissipation fin is disposed on the second end face.

[0020] In one possible implementation, the projector optical engine provided in this application further includes an external fan disposed on the outside of the housing; the external fan and the heat dissipation module are disposed on opposite sides of the housing, and the airflow driven by the external fan flows sequentially through the heat dissipation module and the light source.

[0021] On the other hand, this application also provides a projector, including a housing and the aforementioned projector optical engine, with the housing connected to the housing.

[0022] In the projector optical engine and projector provided in this application, a first air duct is defined by a light valve, a heat-insulating glass, and the inner wall of the light channel; a second air duct is defined by the heat-insulating glass, a first Fresnel lens, and the inner wall of the light channel; a mounting cavity is defined within the heat dissipation module; the first and second air ducts are connected on the side away from the heat dissipation module; and the sides of the first and second air ducts facing the heat dissipation module are respectively connected to the mounting cavity; an internal circulation fan is disposed within the mounting cavity to drive airflow to circulate within the first air duct, the second air duct, and the mounting cavity.

[0023] Therefore, during the use of the projector provided in this application, the air blown out by the internal circulation fan will first flow into the first air duct, and the temperature difference formed by this part of the airflow and the light-incident surface of the light valve will be used to dissipate heat from the light valve. After that, the dissipated airflow flows out from the first air duct to the second air duct, and then is drawn in by the air inlet of the internal circulation fan. After being pressurized by the internal circulation fan, it is blown back into the first air duct to complete one cycle.

[0024] In other words, during the heat dissipation process of the light valve, the low-temperature airflow blown by the internal circulation fan can be directly blown onto the light-incident surface of the light valve where the heat is concentrated. Compared with the related technologies where the heat dissipation airflow needs to flow through the light-incident and light-out surfaces of the light valve, in this application, the airflow blown by the internal circulation fan does not dissipate heat to other devices during its flow to the first air duct, i.e. there is no flow rate or temperature loss. This results in a larger airflow rate to the light-incident surface of the light valve and a larger temperature difference between the heat dissipation airflow and the light-incident surface of the light valve. Consequently, the heat exchange process between the heat dissipation airflow and the light-incident surface of the light valve is more intense, resulting in a better heat dissipation effect on the light valve.

[0025] Meanwhile, compared with the flow process of heat dissipation airflow in related technologies, in this application, the path of the airflow blown out by the internal circulation fan to the light-incident surface of the light valve is shorter, which can improve the heat dissipation efficiency of the light valve. Attached Figure Description

[0026] Figure 1 is an exploded view of the projector optical engine provided in an embodiment of this application;

[0027] Figure 2 is a schematic diagram of the planar structure of the projector optical engine provided in an embodiment of this application;

[0028] Figure 3 is a schematic diagram of the planar structure along direction A in Figure 2;

[0029] Figure 4 is a cross-sectional view of Figure 2 along the BB direction;

[0030] Figure 5 is a three-dimensional structural diagram of the housing in the projector optical engine provided in the embodiment of this application;

[0031] Figure 6 is a three-dimensional structural diagram of Figure 5 from another perspective;

[0032] Figure 7 is a schematic diagram of the airflow direction for heat dissipation of the light valve in the projector optical engine provided in the embodiment of this application;

[0033] Figure 8 is a schematic diagram of the first partial structure of the air duct shell in the projector optical engine provided in the embodiment of this application;

[0034] Figure 9 is a schematic diagram of the second partial structure of the air duct shell in the projector optical engine provided in the embodiment of this application;

[0035] Figure 10 is a schematic diagram of the airflow direction for heat dissipation in the projector optical engine provided in the embodiment of this application.

[0036] Figure label:

[0037] 1. Housing; 2. Light source; 3. Reflector; 4. First Fresnel lens; 5. Heat-insulating glass; 6. Light valve; 7. Second Fresnel lens; 8. Projection lens; 9. Heat dissipation module;

[0038] 11. First shell main body; 12. Second shell main body; 13. Third shell main body; 14. Optical channel; 15. Lens bracket; 16. Optical valve bracket; 91. Air duct shell; 92. Second heat dissipation fins; 93. Partition assembly; 94. Second arc-shaped plate; 10. Internal circulation fan; 20. First air duct; 30. Second air duct; 40. Mounting cavity; 50. Arc-shaped guide channel; 60. Heat exchange assembly; 70. External fan;

[0039] 100. Projector optical engine; 111. Light-transmitting hole; 121. Arc-shaped part; 122. Heat conduction port; 131. Protrusion; 911. First shell part; 912. Second shell part; 913. First arc-shaped plate; 921. Inner fin assembly; 922. Outer fin assembly; 931. Heat-conducting baffle; 932. Fan baffle; 401. Fan cavity; 402. Air duct cavity; 601. Substrate; 602. Third heat dissipation fin; 603. Fourth airflow channel; 604. Fourth heat dissipation fin; 605. Fifth airflow channel;

[0040] 9111, First shell main body; 9112, Receiving groove; 9121, Second shell main body; 9122, Groove; 9123, Positioning post; 9211, First fin unit; 9212, Air guide duct; 9221, Second fin unit; 9222, Third fin unit; 9223, Fourth fin unit; 9224, First airflow channel; 9225, Second airflow channel; 9226, Third airflow channel; 9311, Air outlet; 9321, Air inlet; 6011, First end face; 6012, Second end face. Detailed Implementation

[0041] Please refer to Figures 1 to 4. Figure 1 is an exploded view of the projector optical engine provided in this embodiment, Figure 2 is a planar structural diagram of the projector optical engine provided in this embodiment, Figure 3 is a planar structural diagram of Figure 2 along direction A, and Figure 4 is a cross-sectional view of Figure 2 along direction BB. As shown in the figures, this embodiment provides a projector optical engine 100, including a housing 1, a light source 2, a reflector 3, a first Fresnel lens 4, a heat-insulating glass 5, a light valve 6, a second Fresnel lens 7, and a projection lens 8. The function of the projection lens 8 and the second Fresnel lens 7 is to project and magnify the image displayed by the light valve 6. The light source 2 can be an LED panel, and the light valve 6 can be an LCD. Of course, in some other embodiments, the light source 2 can also be a laser lamp, etc., and the light valve 6 can be a Liquid Crystal On Silicon (LCoS) liquid crystal coated silicon, etc. Here, the types of the light source 2 and the light valve 6 are not specifically limited.

[0042] Please refer to Figures 5 and 6. Figure 5 is a three-dimensional structural diagram of the housing in the projector optical engine provided in this application embodiment, and Figure 6 is a three-dimensional structural diagram of Figure 5 from another perspective. As shown, the housing 1 includes a first housing body 11, a second housing body 12, and a third housing body 13 connected in sequence. The light source 2 is disposed on the outside of the first housing body 11, and a light-transmitting hole 111 is formed on the first housing body 11 for the light emitted by the light source 2 to pass through. The reflector 3 is disposed inside the first housing body 11, and the shape of the reflector 3 is adapted to the shape of the first housing body 11. The first Fresnel lens 4, the heat-insulating glass 5, the light valve 6, and the second Fresnel lens 7 are disposed inside the second housing body 12. The projection lens 8 is disposed inside the third housing body 13, and the third housing body 13 includes a protrusion 131 adapted to the shape of the projection lens 8 and for the projection lens 8 to extend out.

[0043] The reflector 3 can be a reflective film coated inside the first shell body 11, or it can be a shell structure embedded inside the first shell body 11. In this embodiment, there are no specific limitations on the reflector 3.

[0044] It should be noted that the projector optical engine 100 provided in this embodiment may also include a reflector (not shown in the figure) disposed in the third housing body 13. The main function of the reflector is to deflect the light path and reduce the overall height of the projector optical engine 100.

[0045] Furthermore, a light channel 14 for the light source 2 to pass through is formed inside the housing 1. The first Fresnel lens 4, the heat insulation glass 5, the light valve 6, and the second Fresnel lens 7 are arranged sequentially and at intervals in the light channel 14 along the light emission direction of the light source 2. That is to say, the first Fresnel lens 4 is arranged closer to the light source 2.

[0046] Understandably, during normal use of the projector, most of the light illuminating the light valve 6 will be absorbed by the light valve 6 and converted into Joule heat. Therefore, it is necessary to set up a corresponding heat dissipation structure to dissipate heat from the light valve 6 and ensure the normal operation of the projector.

[0047] Currently, in a common design, the projector optical engine includes an external housing and internal components such as a light-emitting diode (LED) lamp board, reflector, rear Fresnel lens, heat-insulating glass, liquid crystal display (LCD), front Fresnel lens, and projection lens. The LED lamp board, reflector, rear Fresnel lens, and heat-insulating glass form the projector's light source module. The LCD displays images, and the projection lens and front Fresnel lens project and magnify the image displayed on the LCD. During normal operation of the projector optical engine, the LCD accumulates a significant amount of heat; therefore, a corresponding heat dissipation module is required to cool the LCD.

[0048] For ease of description, in the following description, the side of the light valve 6 that faces the light source 2 will be called the light-incident side, and the side of the light valve 6 that faces away from the light source 2 will be called the light-exit side.

[0049] Currently, in traditional LCD projectors, some models employ a two-sided fan design for cooling the LCD. One fan generates the cooling airflow (cool air before it comes into contact with the LCD), while the other extracts it. As mentioned above, since the LCD projector's display module consists of a rear focal length mirror, heat-insulating glass, liquid crystal display (LCD), and front focal length mirror arranged from bottom to top, the cool airflow first passes through the light-incident surface of the LCD (in this embodiment, the light valve 6), then flows upwards to the light-emitting surface, and finally is extracted from the projector by the other fan. This method requires the generated cooling airflow to undergo secondary cooling by passing through both the light-incident and light-emitting surfaces of the LCD. After passing the light-incident surface, the airflow temperature rises sharply, resulting in a small temperature difference between the airflow and the LCD's light-emitting surface when the airflow passes through it. In some cases, the airflow temperature may even exceed the temperature of the LCD's light-emitting surface, thus preventing the airflow from effectively cooling the entire LCD.

[0050] In addition, some LCD projectors use a single fan to simultaneously cool both the light-incident and light-exit surfaces of the LCD. This means the LCD is positioned in the center of the fan's outlet, allowing the cool airflow from the fan to be split into two streams, thus simultaneously cooling both the light-incident and light-exit surfaces. The cooled airflow then exits directly from the opposite outlet of the LCD projector. However, this cooling method results in relatively low airflow velocity, which may not be sufficient for effectively cooling the LCD.

[0051] In summary, traditional LCD projectors primarily consider the following factors when dissipating heat from the LCD: the temperature difference between the airflow and the LCD (the temperature difference when the airflow contacts the light inlet or outlet surface of the light valve 6), and the airflow velocity within the cooling duct (the airflow velocity in the channel leading to the light valve 6). However, current LCD projectors cannot effectively accommodate both of these heat dissipation factors, resulting in low heat dissipation efficiency.

[0052] In this application, considering that the heat of the light valve 6 mainly accumulates from the light-incident surface of the light valve 6 and is then conducted to the light-exit surface of the light valve 6, this application mainly addresses the problem of heat accumulation at the light-incident surface of the light valve 6, thereby ensuring the heat dissipation efficiency of the LCD projector. Specifically, the cold airflow generated by the fan is preferentially directed to dissipate heat from the light-incident surface of the light valve 6. Simultaneously, because there is no need to redirect the airflow to the light-exit surface of the light valve 6, the problem of airflow splitting when passing through the light-incident and light-exit surfaces of the light valve 6 is avoided. In other words, the solution of this application takes into account both the temperature difference between the airflow and the light valve 6 and the airflow velocity in the channel leading to the light valve 6, thereby improving the heat dissipation efficiency of the LCD projector.

[0053] Therefore, the embodiments of this application provide a projector optical engine and a projector, which, with the combination of a heat dissipation module and an internal air duct, achieves better heat dissipation for the light valve.

[0054] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation details.

[0055] Please refer to Figure 7, which is a schematic diagram of the airflow direction for cooling the light valve in the projector optical engine provided in this embodiment. It should be noted that the arrows in the figure indicate the direction of the cooling airflow. The projector optical engine 100 provided in this embodiment also includes a heat dissipation module 9 and an internal circulation fan 10. The heat dissipation module 9 is disposed outside the housing 1 and located on one side of the first Fresnel lens 4, the heat insulation glass 5, and the light valve 6. The inner wall of the light valve 6, the heat insulation glass 5, and the light channel 14 defines a first air duct 20, and the inner wall of the heat insulation glass 5, the first Fresnel lens 4, and the light channel 14 defines a second air duct 30. An installation cavity 40 is formed inside the heat dissipation module 9. The side of the first air duct 20 and the second air duct 30 away from the heat dissipation module 9 are connected, and the side of the first air duct 20 and the second air duct 30 facing the heat dissipation module 9 are respectively connected to the installation cavity 40. The internal circulation fan 10 is disposed inside the installation cavity 40 to drive the airflow to circulate within the first air duct 20, the second air duct 30, and the installation cavity 40, so that the airflow blown out by the internal circulation fan 10 first flows through the light-incident surface of the light valve 6, and then flows back to the internal circulation fan 10 through the second air duct 30 and the installation cavity 40.

[0056] The internal circulation fan 10 is disposed inside the projector optical engine 100 and is used to form the internal circulation heat dissipation air duct formed by the first air duct 20, the second air duct 30 and the mounting cavity 40. That is, the internal circulation fan 10 is the airflow driving structure in the internal circulation heat dissipation air duct of the projector optical engine 100.

[0057] According to the above description, in this embodiment, the light-incident surface of the light valve 6 forms part of the air duct wall of the first air duct 20.

[0058] Thus, during the use of the projector provided in this embodiment, the air blown out by the internal circulation fan 10 will first flow into the first air duct 20, and the temperature difference formed between this part of the airflow and the surface of the light-incident surface will be used to dissipate heat from the light valve 6. After that, the dissipated airflow flows out from the first air duct 20 to the second air duct 30, and is then drawn in through the air inlet of the internal circulation fan 10. After being pressurized by the internal circulation fan 10, it is blown back into the first air duct 20 to complete one cycle. In other words, during the heat dissipation process of the light valve 6, the low-temperature airflow blown by the internal circulation fan 10 can directly blow onto the light-incident surface of the light valve 6, where heat is concentrated. Compared with the related technologies where the heat dissipation airflow needs to flow through both the light-incident and light-outcident surfaces of the light valve 6, in this embodiment, the airflow blown by the internal circulation fan 10 does not dissipate heat to other components during its flow to the first air duct 20, meaning there is no flow rate or temperature loss. This results in a larger airflow rate towards the light-incident surface of the light valve 6 and a larger temperature difference between the heat dissipation airflow and the light-incident surface of the light valve 6. Consequently, the heat exchange process between the heat dissipation airflow and the light-incident surface of the light valve 6 is more intense, leading to better heat dissipation of the light valve 6. Furthermore, compared to the flow process of the heat dissipation airflow in related technologies, the path of the airflow blown by the internal circulation fan 10 to the light-incident surface of the light valve 6 is shorter in this embodiment, thus improving the heat dissipation efficiency of the light valve 6.

[0059] Furthermore, in some embodiments, the internal circulation fan 10 drives the airflow in the second air duct 30 to be drawn into the mounting cavity 40, and then discharged into the first air duct 20 after passing through the mounting cavity 40. Thus, under the driving action of the internal circulation fan 10, significant airflow loss during flow can be avoided to a certain extent. Moreover, the airflow in the second air duct 30 can be cooled to a certain extent after flowing into the mounting cavity 40, resulting in a lower temperature of the airflow flowing into the first air duct 20. This further increases the temperature difference between the airflow flowing into the first air duct 20 and the light-receiving surface, thereby improving the heat dissipation effect on the light valve 6.

[0060] It is understandable that in order to form a circulating flow channel between the first air duct 20, the second air duct 30 and the mounting cavity 40, the airflow direction in the first air duct 20 should be opposite to the airflow direction in the second air duct 30. Thus, when the airflow flows from the first air duct 20 to the second air duct 30, the direction will change, for example, by 180 degrees. At this time, in order to ensure that the airflow can still flow smoothly and with minimal energy loss, it is necessary to reduce the friction between the airflow and the second shell body 12.

[0061] Based on this, as an optional implementation, an arc-shaped portion 121 is formed on the second shell body 12. The arc-shaped portion 121 is located on the side of the second shell body 12 away from the heat dissipation module 9 and arches away from the heat insulation glass 5. An arc-shaped guide channel 50 is defined between the inner wall of the arc-shaped portion 121 and the side of the heat insulation glass 5 away from the heat dissipation module 9. The sides of the first air duct 20 and the second air duct 30 away from the heat dissipation module 9 are connected through the arc-shaped guide channel 50. In this way, when the airflow flows from the first air duct 20 into the second air duct 30, the formed arc-shaped guide channel 50 can provide a certain amount of clearance for the airflow to change direction. On the one hand, it can improve the smoothness of the airflow during the flow process and further improve the heat dissipation efficiency of the light valve 6. On the other hand, it can avoid collision with the inner wall of the second shell body 12 during the change of direction to a certain extent, thus preventing losses and further improving the heat dissipation effect of the light valve 6.

[0062] If the temperature of the airflow flowing into the arc-shaped guide channel 50 can be reduced to a certain extent, it will not only reduce the temperature of the airflow flowing into the second air duct 30, but also reduce the temperature of the airflow flowing into the first air duct 20 next time, so as to further increase the temperature difference between the airflow flowing in the first air duct 20 and the light-incident surface of the light valve 6, and improve the heat dissipation effect on the light valve 6.

[0063] Therefore, in some specific embodiments, first heat dissipation fins (not shown in the figure) are provided on the inner wall and / or outer wall of the arc-shaped portion 121. This increases the heat exchange area between the airflow and the arc-shaped portion 121 when the airflow flows within the arc-shaped guide channel 50, thereby reducing the temperature of the airflow flowing within the arc-shaped guide channel 50. This further improves the heat dissipation effect on the first Fresnel lens 4, the heat-insulating glass 5, and the light valve 6, further enhancing the performance of the projector provided in this embodiment.

[0064] It should be noted that the extension direction of the first heat dissipation fin is consistent with the flow direction of the airflow within the arc-shaped guide channel 50. This ensures sufficient contact with the airflow and minimizes noise during the airflow process.

[0065] In other embodiments, the shape of the arc-shaped portion 121 is not limited to an arc shape; it can also be rectangular, and the material used for the arc-shaped portion 121 can be metal or plastic. Here, no specific limitations are placed on the shape and material of the arc-shaped portion 121.

[0066] In this specific embodiment, the outline shape of the arc-shaped portion 121 is adapted to the outline shape of a semicircle. In this way, it can avoid airflow to the greatest extent and improve the smoothness of airflow during the flow process.

[0067] Furthermore, the forming method of the arc-shaped portion 121 can be integrally formed with other structures on the housing 1, or it can be a separate plate-like structure connected to other structures on the housing 1 by means of bonding or welding. Here, no specific limitation is made on the forming method of the arc-shaped portion 121.

[0068] Since the first air duct 20 and the second air duct 30 are both formed inside the housing 1, while the mounting cavity 40 is formed outside the housing 1, in order to make the first air duct 20 and the second air duct 30 communicate with the mounting cavity 40, in some embodiments, the second housing body 12 is provided with a heat conduction port 122 communicating with the optical channel 14 on one side corresponding to the heat dissipation module 9. The heat dissipation module 9 includes an air duct housing 91 and a second heat dissipation fin 92 connected to the air duct housing 91. The mounting cavity 40 is formed inside the air duct housing 91. The air duct housing 91 covers the heat conduction port 122 and abuts against the optical valve 6 and the first Fresnel lens 4.

[0069] Thus, by setting the second heat dissipation fins 92, the airflow can increase the heat exchange area with the air duct shell 91 when it flows into the mounting cavity 40, reduce the temperature of the airflow flowing into the mounting cavity 40, thereby reducing the temperature of the airflow flowing into the first air duct 20 and improving the heat dissipation effect on the light valve 6.

[0070] Referring to Figures 8 and 9, Figure 8 is a schematic diagram of the first partial structure of the air duct shell in the projector optical engine provided in this embodiment, and Figure 9 is a schematic diagram of the second partial structure of the air duct shell in the projector optical engine provided in this embodiment. The air duct shell 91 includes a first shell portion 911 and a second shell portion 912 that interlock with each other. The first shell portion 911 includes a first shell main body portion 9111, within which a receiving groove 9112 for accommodating the internal circulation fan 10 is formed. The second shell portion 912 includes a second shell main body portion 9121, one end of which is connected to the first shell portion 911, and the other end of which abuts against the first Fresnel lens 4. A groove 9122 is formed within the second shell main body portion 9121, and the groove 9122 and the receiving groove 9112 together form the aforementioned mounting cavity 40. At least a portion of the second heat dissipation fins 92 can be disposed within the mounting cavity 40.

[0071] The air duct shell 91 can be made of metal or plastic, and no specific limitation is made in this embodiment.

[0072] Furthermore, if the circulating air duct formed by connecting the first air duct 20, the second air duct 30, and the mounting cavity 40 is not sealed, not only will dust and other contaminants enter, affecting the sealing performance of the circulating air duct, but the heat dissipation airflow will also escape. Therefore, the circulating air duct formed by connecting the first air duct 20, the second air duct 30, and the mounting cavity 40 should be sealed.

[0073] Therefore, the aforementioned air duct shell 91 should also include a first arc-shaped plate 913, with both ends of the first arc-shaped plate 913 connected to the first shell main body 9111 and the light valve 6, respectively. As for the molding method of the first arc-shaped plate 913, it can be integrally molded with the first shell main body 9111 or integrally molded with the second shell main body 9121.

[0074] It should be noted that when the first arc-shaped plate 913 is integrally formed with the first shell body 9111, the second shell body 912 also includes two spaced positioning posts 9123 disposed on the second shell body 9121. The first arc-shaped plate 913 is connected between the two positioning posts 9123, and its two ends abut against the first shell body 9111 and the light valve 6, respectively. Here, the specific arrangement of the first arc-shaped plate 913 is not limited.

[0075] It is understandable that, in order to set up the first Fresnel lens 4 and the light valve 6, a lens bracket 15 and a light valve bracket 16 are connected inside the second shell body 12. The lens bracket 15 is used to fix the first Fresnel lens 4, and the light valve bracket 16 is used to fix the light valve 6. The other end of the second shell body 9121 abuts against the lens bracket 15, and the first arc plate 913 abuts between the first shell body 9111 and the light valve bracket 16.

[0076] In some optional embodiments, in order to fix the internal circulation fan 10 and to separate the portion of the mounting cavity 40 communicating with the first air duct 20 from the portion of the mounting cavity 40 communicating with the second air duct 30, the heat dissipation module 9 further includes a partition assembly 93 disposed in the air duct housing 91. The partition assembly 93 divides the mounting cavity 40 into a communicating fan cavity 401 and an air duct cavity 402. The fan cavity 401 communicates with the first air duct 20, and the air duct cavity 402 communicates with the second air duct 30. The internal circulation fan 10 is disposed in the fan cavity 401. The partition assembly 93 abuts against the side of the heat insulation glass 5 facing the heat dissipation module 9.

[0077] In this way, by setting the partition assembly 93, the mounting cavity 40 can be divided to a certain extent. On the one hand, the cooperation between the partition assembly 93 and the first shell 911 can effectively fix the internal circulation fan 10. On the other hand, by dividing the mounting cavity 40 into the fan cavity 401 and the air duct cavity 402, during the operation of the internal circulation fan 10, the airflow in the air duct cavity 402 can flow into the fan cavity 401 in a more concentrated manner, and then into the first air duct 20, which avoids the loss of airflow direction to a certain extent. Moreover, if the second heat dissipation fins 92 are set in the air duct cavity 402, the airflow flowing into the first air duct 20 can be cooled twice in the air duct cavity 402 and the fan cavity 401, so as to further improve the heat dissipation effect on the light valve 6.

[0078] As can be seen from the above, if a second heat dissipation fin 92 is provided in the air duct cavity 402, the airflow can be cooled twice when it flows into the first air duct 20, which can further improve the heat dissipation effect on the light valve 6. Therefore, in some embodiments, the second heat dissipation fin 92 includes an inner fin group 921 provided in the air duct cavity 402.

[0079] Specifically, the inner fin assembly 921 includes multiple spaced-apart first fin units 9211, with an air guide duct 9212 formed between adjacent first fin units 9211. The air guide duct 9212 is open in the direction from the second air duct 30 to the fan cavity 401. Driven by the internal circulation fan 10, the airflow in the second air duct 30 first flows into the air duct cavity 402, then through the multiple air guide ducts 9212 to the fan cavity 401, and finally into the first air duct 20 to cool the light-incident surface of the light valve 6. During this process, as the airflow flows within the air duct cavity 402, the formation of multiple air guide ducts 9212 results in a larger heat exchange area, enabling the airflow to cool down and thus reducing the temperature of the airflow flowing into the first air duct 20, thereby improving the heat dissipation effect on the light valve 6.

[0080] It should be noted that the first fin unit 9211 described above can be a straight fin, a snap-on fin, a needle-shaped fin, a corrugated fin, etc. That is, the shape of the first fin unit 9211 is not specifically limited in this embodiment. As long as the air guide channel 9212 described above is formed between two adjacent first fin units 9211, the purpose of this embodiment can be achieved.

[0081] Furthermore, the extension length of the first fin unit 9211 matches the dimension of the air duct cavity 402 in the extension direction of the first fin unit 9211.

[0082] It is understood that if the contact area between the outer surface of the projector optical engine 100 and the external airflow is large, the heat exchange area between the outer surface of the projector optical engine 100 and the external airflow can also be increased. Thus, the projector optical engine 100 as a whole can be cooled, further improving the performance of the projector optical engine 100 and the projector.

[0083] Based on this, the aforementioned second heat dissipation fin 92 further includes an outer fin assembly 922, which is connected to at least a portion of the outer wall surface of the air duct housing 91 corresponding to the fan cavity 401 and / or the air duct cavity 402. This increases the heat exchange area between the outer wall surface of the air duct housing 91 and the external airflow, thereby enabling effective heat dissipation for the projector optical engine 100 provided in this embodiment.

[0084] In some specific embodiments, the outer fin group 922 may include a plurality of spaced second fin units 9221, a plurality of spaced third fin units 9222, and a plurality of spaced fourth fin units 9223, wherein the plurality of second fin units 9221 are disposed on the first shell body portion 9111.

[0085] Specifically, the first shell body 9111 has an outer wall surface that is spaced apart from the internal circulation fan 10 along the axial direction of the internal circulation fan 10. A plurality of second fin units 9221 are disposed on the outer wall surface and extend from one side of the light valve 6 to the side of the light source 2. That is, the second fin units 9221 extend from the first arc plate 913 to the end of the first shell body 9111, and a first flow channel 9224 is formed between two adjacent second fin units 9221.

[0086] Furthermore, the first shell body 9111 has outer wall surfaces located on both sides of the internal circulation fan 10, and a plurality of third fin units 9222 are disposed on the two outer wall surfaces, and the extension direction of the third fin units 9222 is consistent with the axial direction of the internal circulation fan 10, and a second flow channel 9225 is formed between two adjacent third fin units 9222.

[0087] Furthermore, the second shell body 9121 has outer wall surfaces located on both sides of the internal circulation fan 10, and a plurality of fourth fin units 9223 are disposed on the two outer wall surfaces, and the extension direction of the fourth fin units 9223 is consistent with the axial direction of the internal circulation fan 10, and a third flow channel 9226 is formed between two adjacent fourth fin units 9223.

[0088] It is understandable that during the heat dissipation process of the light valve 6, if the heat exchange area between the gas flowing into the fan cavity 401 and the flow channel wall of the fan cavity 401 is large, the airflow can be cooled a second time. Therefore, in some optional embodiments, microfins, microneedles, or other heat dissipation structures can also be provided on the bottom wall of the receiving groove 9112 to increase the heat exchange area with the airflow. Of course, the setting of this heat dissipation structure should not affect the rotation of the internal circulation fan 10. Therefore, the height of the heat dissipation structure is less than or equal to 30% of the thickness of the blades of the internal circulation fan 10. In this way, on the one hand, the heat exchange area of ​​the airflow in the fan cavity 401 is increased, and on the other hand, the design of the above-mentioned heat dissipation structure can be avoided to a certain extent from affecting the rotation of the internal circulation fan 10, and the overall structure of the projector optical engine 100 provided in this embodiment is more compact.

[0089] In some specific embodiments, to configure the aforementioned baffle assembly 93 and ensure airflow throughout the entire circulating air duct, the baffle assembly 93 may include a heat-conducting baffle 931 and a fan baffle 932 abutting together. The heat-conducting baffle 931 abuts against the heat-insulating glass 5, specifically, the heat-conducting baffle 931 abuts against the heat-insulating glass 5 via a second arc-shaped plate 94. The heat-conducting baffle 931 is provided with an air outlet 9311, and the fan baffle 932 is provided with an air inlet 9321 opposite to the air outlet 9311, and the size of the air inlet 9321 is adapted to the air intake of the internal circulation fan 10. Thus, under the driving action of the internal circulation fan 10, the airflow in the air duct cavity 402 can flow sequentially through the air outlet 9311 and the air inlet 9321 into the fan cavity 401, and then into the first air duct 20, thereby achieving heat dissipation for the light valve 6.

[0090] More specifically, the heat-conducting baffle 931 is connected to one of the first shell portion 911 and the second shell portion 912, and the fan baffle 932 is sandwiched between the first shell portion 911 and the second shell portion 912.

[0091] In this embodiment, the heat-conducting baffle 931 is connected to the second shell body 9121 of the second shell 912 and is integrally formed with the second shell body 9121, and the fan baffle 932 is connected to the first shell body 9111 of the first shell 911.

[0092] It is understandable that the light source 2 generates the most heat during the use of the projector. Therefore, if a corresponding heat dissipation module can be set for the light source 2, the heat dissipation effect of the projector optical engine 100 provided in this embodiment can be further improved, thereby improving the performance of the projector optical engine 100 and the projector.

[0093] Therefore, the projector optical engine 100 provided in this embodiment also includes a heat exchange component 60. When the light source 2 is an LED lamp panel, the light source 2 is connected to the outside of the first housing body 11. The heat exchange component 60 includes a substrate 601 and a third heat dissipation fin 602 disposed on the substrate 601. The third heat dissipation fin 602 surrounds the lamp panel and extends towards one side of the housing 1. A fourth flow channel 603 is formed between two adjacent third heat dissipation fins 602, and the extension direction of the fourth flow channel 603 is consistent with the axis of the internal circulation fan 10. In this way, the airflow around the lamp panel can be cooled to a certain extent, which can further improve the heat dissipation effect of the entire projector optical engine 100.

[0094] The substrate 601 has a first end face 6011 and a second end face 6012 disposed opposite to each other; the first end face 6011 is connected to the lamp panel, and the third heat dissipation fin 602 is disposed on the first end face 6011.

[0095] In order to further improve the heat dissipation effect of the heat exchange component 60, a fourth heat dissipation fin 604 is provided on the second end face 6012. The fourth heat dissipation fin 604 extends in a direction away from the second end face 6012, and a fifth flow channel 605 is formed between two adjacent fourth heat dissipation fins 604, with the extension direction consistent with the axis of the internal circulation fan 10.

[0096] Of course, to further improve the heat dissipation effect of the projector optical engine 100, a heat dissipation airflow path needs to be formed outside the projector optical engine 100. Please refer to Figure 10, which is a schematic diagram of the airflow direction for heat dissipation of the entire projector optical engine provided in the embodiment of this application. The arrows in the figure indicate the direction of airflow.

[0097] Therefore, the projector optical engine 100 provided in this embodiment also includes an external fan 70 disposed on the outside of the housing 1; the external fan 70 and the heat dissipation module 9 are disposed on opposite sides of the housing 1, and the external fan 70 drives the airflow to flow sequentially through the heat dissipation module 9 and the light source 2. In this way, the cooling airflow first flows through the heat dissipation module 9 with a lower temperature, and then flows through the light source 2 with a higher temperature. That is to say, the flow direction of the cooling airflow is opposite to the flow direction of the hot air. This makes the temperature difference between the cooling airflow and, for example, the part of the projector optical engine 100 where the light source 2 is located, larger, thus resulting in a better overall heat dissipation effect for the projector optical engine 100.

[0098] Furthermore, the third fin unit 9222, the fourth fin unit 9223, the third heat dissipation fin 602, and the fourth heat dissipation fin 604 are all located on the external heat dissipation airflow path, allowing the cooling airflow to pass directly through the fins. This results in a larger heat exchange area between the cooling airflow and the overall projector optical engine 100, further improving the overall heat dissipation effect of the projector optical engine 100. Moreover, the thermal conductivity requirements of the materials used in the structure located on the heat dissipation airflow path are relatively low, thus reducing the manufacturing cost of the projector optical engine 100 provided in this embodiment.

[0099] This embodiment also provides a projector, including a housing (not shown in the figure) and a projector optical engine 100 as described in the above embodiments, with the housing 1 connected to the housing. The structure of the projector optical engine 100 has been described in detail in the above embodiments and will not be repeated here.

[0100] It should be noted that a bracket can also be installed inside the housing, on which the aforementioned external fan 70 can be mounted. Of course, the projector provided in this embodiment also includes other modules such as circuit boards; however, these other modules will not be described in detail here.

Claims

1. A projector light engine, wherein, The shell, the light source, the first Fresnel lens, the heat insulation glass, the light valve, the heat dissipation module and the internal circulation fan are included. The shell is internally formed with a light channel for the light of the light source to pass through, the first Fresnel lens, the heat insulation glass and the light valve are sequentially and spacedly arranged in the light channel along the light emitting direction of the light source; the heat dissipation module is arranged outside the shell and located at one side of the first Fresnel lens, the heat insulation glass and the light valve. The light valve, the heat insulation glass and the inner wall of the light channel define a first air duct, the heat insulation glass, the first Fresnel lens and the inner wall of the light channel define a second air duct, the heat dissipation module is internally formed with a mounting cavity, the first air duct and the second air duct are connected at the side away from the heat dissipation module, and the first air duct and the second air duct are respectively communicated with the mounting cavity at the side towards the heat dissipation module. The internal circulation fan is arranged in the mounting cavity and is used to drive the airflow to circulate in the first air duct, the second air duct and the mounting cavity, so that the airflow blown by the internal circulation fan first flows through the light entrance surface of the light valve and then flows back to the internal circulation fan through the second air duct and the mounting cavity.

2. The projector light engine of claim 1, wherein, The internal circulation fan drives the airflow in the second air duct to be sucked into the mounting cavity and then discharged into the first air duct through the mounting cavity.

3. The projector light engine of claim 1 or 2, wherein, The shell includes an arc-shaped portion located at the side of the shell away from the heat dissipation module and curved towards the direction away from the heat insulation glass. The inner wall of the arc-shaped portion and the side of the heat insulation glass away from the heat dissipation module define an arc-shaped flow guide channel, and the first air duct and the second air duct are connected at the side away from the heat dissipation module through the arc-shaped flow guide channel.

4. The projector light engine of claim 3, wherein, The inner wall of the arc-shaped portion and / or the outer wall of the arc-shaped portion is provided with first heat dissipation fins.

5. The projector light engine of claim 1 or 2, wherein, The shell is provided with a heat conduction opening communicating with the light channel at the side corresponding to the heat dissipation module, the heat dissipation module includes an air duct shell and second heat dissipation fins connected to the air duct shell, and the air duct shell is internally formed with the mounting cavity. The air duct shell covers the heat conduction opening and abuts against the light valve and the first Fresnel lens.

6. The projector light engine of claim 5, wherein, The heat dissipation module further includes a partition assembly arranged in the air duct shell, the partition assembly separates the mounting cavity into a fan cavity and an air duct cavity in communication, the fan cavity is communicated with the first air duct, and the air duct cavity is communicated with the second air duct. The partition assembly abuts against the side of the heat insulation glass towards the heat dissipation module.

7. The projector light engine of claim 6, wherein, The internal circulation fan is arranged in the fan cavity, and the second heat dissipation fins include an inner fin group arranged in the air duct cavity.

8. The projector light engine of claim 7, wherein, The inner fin group includes a plurality of spaced first fin units, and a guide air duct is formed between adjacent two first fin units and is communicated in the direction from the second air duct to the fan cavity.

9. The projector light engine of claim 6, wherein, The second heat dissipation fins further include an outer fin group connected to at least part of the outer wall surface of the air duct shell corresponding to the fan cavity and / or the air duct cavity.

10. The projector light engine of claim 6, wherein, The partition assembly comprises a heat-conducting partition and a fan partition abutting against each other, and the heat-conducting partition abuts against the heat-insulating glass; The heat-conducting partition is provided with a through air port, and the fan partition is provided with an air inlet port opposite to the through air port, and the size of the air inlet port is matched with the air suction port of the inner circulating fan.

11. The projector light engine of claim 10, wherein, The air duct shell comprises a first shell part and a second shell part which are buckled to each other, the heat-conducting partition is connected to one of the first shell part and the second shell part, and the fan partition is clamped between the first shell part and the second shell part. The first shell part and / or the second shell part are provided with the second heat dissipation fins.

12. The projector light engine of any of claims 1-2, 4, 6-11, wherein, Further comprising a heat exchange assembly; The light source comprises a lamp plate outside the shell, the heat exchange assembly comprises a base plate and third heat dissipation fins provided on the base plate, the third heat dissipation fins surround the lamp plate, and the third heat dissipation fins extend towards one side of the shell.

13. The projector light engine of claim 12, wherein, The base plate has a first end face and a second end face arranged oppositely; The first end face is connected with the lamp plate, and the third heat dissipation fins are arranged on the first end face; The second end face is provided with fourth heat dissipation fins.

14. The projector light engine of any of claims 1-2, 4, 6-11, 13, wherein, Further comprising an outer fan arranged outside the shell; The outer fan and the heat dissipation module are arranged on opposite sides of the shell, and the outer fan drives air flow to flow through the heat dissipation module and the light source in sequence.

15. A projector, wherein, The projector light machine comprises a cover shell and the projector light machine according to any one of claims 1 to 14, and the shell is connected to the cover shell.

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