A projector light machine and projector with a novel heat dissipation air duct structure

Abstract

The utility model provides a kind of projector light machine and projector with novel heat dissipation air duct structure, wherein light machine includes shell, light source plate, light funnel, lens module, reflector and projection lens, light source plate, light funnel, reflector and lens module are arranged in the inside of shell, the left side of shell lower end is provided with projection port, the upper end of projection lens is located in projection port, reflector is obliquely arranged above projection lens, lens module is located at the right side of reflector, light funnel is located at the right side of lens module, light source plate is installed on the inner wall of shell right end, lens module includes rear phi mirror, rear heat insulation glass, LCD screen frame assembly, front heat insulation glass and front phi mirror sequentially arranged from left to right, LCD screen frame assembly is rotatably arranged in the inside of shell, the utility model provides technical scheme, the rotation of LCD screen frame assembly is accurately controlled by software and structural member to realize the purpose of controlling depth of field, and the heat dissipation effect of entire projector is improved simultaneously.

Description

Technical Field

[0001] This utility model relates to the technical field of projection equipment, specifically to a projector optical engine with a novel heat dissipation duct structure, and also provides a projector. Background Technology

[0002] With the popularization of electronic devices, projectors have gradually entered the public eye. Projectors have advantages such as large display area and convenient portability, and are often used in meetings, teaching, and presentations. At the same time, they are gradually entering homes, and more and more people plan to use projectors to replace TVs as home audio-visual equipment. However, projectors on the market are currently developing towards miniaturization. The depth of field is usually controlled by rotating the LCD screen. However, rotating the LCD screen will narrow the heat dissipation air channel between the lens modules in some areas or even cause the air channel to be blocked, resulting in poor heat dissipation. Utility Model Content

[0003] In view of the above-mentioned problems in the prior art, the present invention provides a projector optical engine and projector with a novel heat dissipation air duct structure to overcome the above-mentioned defects in the prior art.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0005] A projector optical engine with a novel heat dissipation duct structure includes a housing, a light source board, a light chamber, a lens module, a reflector, and a projection lens.

[0006] The light source plate, light chamber, reflector, and lens module are disposed inside the housing. A projection port is provided on the lower left side of the housing. The upper end of the projection lens is located inside the projection port. The reflector is obliquely disposed above the projection lens. The lens module is located to the right of the reflector. The light chamber is located to the right of the lens module. The light source plate is mounted on the inner wall of the right end of the housing. The left end of the light chamber is connected to the right end of the lens module, and the right end is connected to the light source plate. The lens module includes a rear Fresnel lens, a rear heat-insulating glass, an LCD screen frame assembly, a front heat-insulating glass, and a front Fresnel lens arranged sequentially from left to right. The LCD screen frame assembly is rotatably disposed inside the housing.

[0007] In one embodiment, the LCD screen frame assembly includes a screen frame frame and an LCD screen body disposed inside the screen frame frame. The upper and lower ends of the screen frame frame are connected to the housing by connecting plates made of elastic material.

[0008] A pivot is provided at the middle position of the front end of the screen frame, and a fixed bracket is provided on the side wall of the housing at a position corresponding to the pivot. The front end of the pivot is rotatably connected to the fixed bracket.

[0009] The front end of the screen frame is also provided with a movable arm, and the middle part of the movable arm is rotatably connected to the fixed bracket.

[0010] A first motor and a first detection box are disposed on the surface of the right end of the housing. A gear is disposed on the main shaft of the first motor. Multiple gear teeth are continuously disposed on the right end face of the movable arm. The gear meshes with the gear teeth on the right end face of the movable arm. The right end face of the movable arm is an inclined surface. A limit block is disposed on the front end face of the first motor, and the limit block is located above the right end of the movable arm.

[0011] The first detection box is equipped with a position detection optical coupler inside, and the first detection box is located below the right end of the movable arm.

[0012] In one embodiment, the LCD screen frame assembly includes a screen frame frame and an LCD screen body disposed inside the screen frame frame. The upper and lower ends of the screen frame frame are connected to the housing by connecting plates made of elastic material.

[0013] A pivot is located at the center of the front end of the screen frame. A fixed bracket is located on the side wall of the housing at a position corresponding to the pivot. The front end of the pivot is rotatably connected to the fixed bracket. A movable arm is also located at the front end of the screen frame, and the middle part of the movable arm is rotatably connected to the fixed bracket.

[0014] A power box and a second detection box are provided on the surface of the right end of the housing, with the second detection box located above the power box.

[0015] The power box contains a movable rod with a slider sliding along it. A second motor is mounted on the lower side wall of the power box, and a lead screw is connected to the upper end of the second motor's main shaft. The upper end of the lead screw passes through the lower side wall of the power box and is rotatably connected to its upper side wall. The rear side wall of the slider is threaded to achieve a threaded connection with the lead screw and drive the slider to move up and down. The front side wall of the slider has a first transverse groove. The right end of the movable arm passes through the housing and is inserted into the first groove from its left end.

[0016] The second detection box is equipped with a position detection optical coupler inside. The position detection optical coupler is provided with a longitudinal second groove. The upper end of the movable arm is provided with a detection arm. The upper end of the detection arm penetrates the bottom wall of the second detection box upward and is inserted into the second groove from the lower end. The left side of the detection arm is an inclined surface.

[0017] In one embodiment, the two sidewalls of the first groove and the second groove are arranged parallel to each other, the width of the upper end of the detection arm is smaller than the width of its lower end, and its right side is arranged parallel to the sidewall of the second groove.

[0018] In one embodiment, the LCD screen frame assembly and the connecting plates at both ends divide the inner cavity of the housing into a left cavity and a right cavity.

[0019] The reflector, rear Fresnel lens, and rear heat-insulating glass are located inside the left cavity, and the projection lens is located on the lower left side of the left cavity.

[0020] The front heat-insulating glass, front mirror, light source plate and light chamber are located inside the right cavity, and heat dissipation plates are respectively embedded on the side walls of the left cavity and the right cavity.

[0021] In one embodiment, a first fan is provided above the reflector, an air inlet is provided on the lower side wall of the first fan, a first heat dissipation channel is formed between the rear heat insulation glass and the LCD screen frame assembly, the air outlet of the first fan is connected to the upper end of the first heat dissipation channel, and the lower end of the first heat dissipation channel is connected to the lower part of the left cavity.

[0022] In one embodiment, a second fan is provided below the light chamber, and an air inlet is provided on the upper side wall of the second fan. A second heat dissipation channel is formed between the front heat insulation glass and the LCD screen frame assembly. The air outlet of the second fan is connected to the lower end of the second heat dissipation channel, and the upper end of the second heat dissipation channel is connected to the upper part of the right cavity.

[0023] This utility model also provides a projector, including a housing, characterized in that it further includes a projector optical engine with a novel heat dissipation duct structure as described above, wherein the projector optical engine with the novel heat dissipation duct structure is disposed inside the housing.

[0024] Compared with the prior art, the projector optical engine and projector with a novel heat dissipation air duct structure provided by this utility model have the following advantages:

[0025] 1. In this utility model, the stroke of the second motor is precisely controlled by software and structural components, so that the connecting plate is deformed to achieve the rotation of the LCD screen frame assembly to achieve the purpose of controlling the depth of field without affecting the heat dissipation effect of the heat dissipation channel. This achieves the goal of not damaging the internal heat dissipation channel and satisfying the heat dissipation effect after rotating the LCD screen without increasing the overall volume of the projector optical engine.

[0026] 2. In this utility model, the interior of the housing is divided into a left cavity and a right cavity by the LCD screen frame assembly and the connecting plate, and fans are respectively installed in the left cavity and the right cavity to dissipate heat from the components inside the left cavity and the right cavity, thereby effectively improving the heat dissipation effect of each component inside the housing, which is conducive to the long-term stable operation of the entire projector. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the internal structure of the optical engine in the LCD screen frame assembly in the non-rotating state.

[0028] Figure 2 This is a schematic diagram of the internal structure of the optical engine in the LCD screen frame assembly under the extreme rotational state of the present invention;

[0029] Figure 3 This is a partial front view structural diagram of the optical engine in Embodiment 1 of this utility model;

[0030] Figure 4 This is a partial front view structural diagram of the optical engine in Embodiment 2 of this utility model. Detailed Implementation

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] 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 number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] like Figure 1-4 As shown, for ease of description, the orientation references of "up", "down", "left", "right", "front" and "rear" in this utility model are attached. Figure 1 The directions shown are for reference only;

[0037] Example 1: A projector optical engine with a novel heat dissipation duct structure includes a housing 1, a light source plate 2, a light chamber 3, a lens module 4, a reflector 5, and a projection lens 6.

[0038] The light source plate 2, light chamber 3, reflector 5, and lens module 4 are arranged inside the housing 1. A projection port is provided on the lower left side of the housing 1. The upper end of the projection lens 6 is located inside the projection port to connect with the housing 1. The reflector 5 is tilted above the projection lens 6. The lens module 4 is located to the right of the reflector 5. The light chamber 3 is located to the right of the lens module 4. The light source plate 2 is installed on the inner wall of the right end of the housing 1. The left end of the light chamber 3 is connected to the right end of the lens module 4, and the right end is connected to the light source plate 2. Therefore, the light emitted by the light source plate 2 will be transmitted to the projection lens 6 through the lens module 4 and the reflector 5, and then projected onto an external projection surface such as a screen to realize the projection operation.

[0039] The lens module 4 includes a rear glass 41, a rear heat insulation glass 42, an LCD screen frame assembly 43, a front heat insulation glass 44 and a front glass 45 arranged from left to right. The LCD screen frame assembly 43 is rotatably disposed inside the housing 1.

[0040] Specifically, the LCD screen frame assembly 43 includes a screen frame frame and an LCD screen body disposed inside the screen frame frame. The upper and lower ends of the screen frame frame are connected to the housing 1 by connecting plates 7, which are made of elastic material.

[0041] A pivot 8 is located at the center of the front end of the screen frame, and a fixed bracket 9 is located on the side wall of the housing 1 at a position corresponding to the pivot 8. The front end of the pivot 8 is rotatably connected to the fixed bracket 9.

[0042] The front end of the screen frame is also provided with a movable arm 10, and the middle part of the movable arm 10 is rotatably connected to the fixed bracket 9.

[0043] A power box 11 and a second detection box 12 are provided on the surface of the right end of the housing 1. The second detection box 12 is located above the power box 11.

[0044] The power box 11 has a movable rod 13 inside, and a slider 14 is slidably mounted on the movable rod 13. A second motor 15 is mounted on the lower side wall of the power box 11. The upper end of the main shaft of the second motor 15 is connected to a lead screw 16. The upper end of the lead screw 16 passes through the lower side wall of the power box 11 and is rotatably connected to its upper side wall. The rear side wall of the slider 14 is threaded to achieve a threaded connection with the lead screw 16 and drive the slider 14 to move up and down. The front side wall of the slider 14 is provided with a transverse first groove 17. The right end of the movable arm 10 passes through the housing 1 and is inserted into the first groove 17 from the left end.

[0045] The second detection box 12 is equipped with a position detection optical coupler 18, which has a longitudinal second groove 19. A detection arm 20 is provided at the upper end of the movable arm 10. The upper end of the detection arm 20 penetrates the bottom wall of the second detection box 12 and is inserted into the second groove 19 through its lower end. The left side of the detection arm 20 is an inclined surface that slopes to the right.

[0046] As can be seen from the above technology, when it is necessary to adjust the angle of the LCD screen frame assembly 43, the second motor 15 is controlled to rotate forward or backward by the controller and corresponding control elements of the projector. In this way, the second motor 15 drives the slider 14 to move up and down along the movable rod 13 through the lead screw 16, which in turn drives the right end of the movable arm 10 and the detection arm 20 to move up and down accordingly. At the same time, because the left side of the detection arm 20 is an inclined surface, and the movable arm 10 and the screen frame are rotatably connected to the fixed bracket 9, the left end of the movable arm 10 and the detection arm 20 will deflect as the right end of the movable arm 10 and the entire LCD screen frame assembly 43 move up and down. With the cooperation of the position detection optocoupler 18, the controller and corresponding control elements of the projector, the rotation angle of the entire LCD screen frame assembly 43 can be precisely controlled, thereby achieving the purpose of controlling the depth of field. At the same time, it achieves the goal of not damaging the internal heat dissipation channel and meeting the heat dissipation effect after rotating the LCD screen without increasing the overall size of the projector's optical engine.

[0047] In this embodiment, in order to improve the precise control of the rotation angle of the entire LCD screen frame assembly 43, the two side walls of the first groove 17 and the second groove 19 are designed to be parallel to each other, the width of the upper end of the detection arm 20 is smaller than the width of its lower end, and its right side is parallel to the side wall of the second groove 19.

[0048] In this embodiment, the LCD screen frame assembly 43 and the connecting plates 7 at both ends divide the inner cavity of the housing 1 into a left cavity and a right cavity.

[0049] The reflector 5, the rear Fresnel mirror 41, and the rear heat-insulating glass 42 are located inside the left cavity, and the projection lens 6 is located on the lower left side of the left cavity.

[0050] The front heat insulation glass 44, the front mirror 45, the light source plate 2 and the light chamber 3 are located inside the right cavity, and heat dissipation plates are respectively embedded on the side walls of the left cavity and the right cavity;

[0051] Furthermore, a first fan 21 is provided above the reflector 5, and an air inlet is provided on the lower side wall of the first fan 22. A first heat dissipation channel 22 is formed between the rear heat insulation glass 42 and the LCD screen frame assembly 43. The air outlet of the first fan 21 is connected to the upper end of the first heat dissipation channel 22, and the lower end of the first heat dissipation channel 22 is connected to the lower part of the left cavity. Therefore, the airflow blown out by the first fan 21 will flow in through the upper end of the first heat dissipation channel 22 and flow into the lower part of the left cavity from the lower end of the first heat dissipation channel 22. The lower part of the left cavity enters the air inlet located on the lower side wall of the first fan 22 through the reflector 5 to realize the circulation of airflow. At the same time, during the airflow process, the heat on the surface of the reflector 5, the rear non-reflector 41, and the rear heat insulation glass 42 will be carried away. When the airflow passes through the heat dissipation plate embedded in the side wall of the left cavity, the heat will be transferred to the heat dissipation plate, thereby achieving the purpose of heat dissipation and cooling of the reflector 5, the rear non-reflector 41, the rear heat insulation glass 42, and the interior of the left cavity.

[0052] In this embodiment, a second fan 23 is provided below the light chamber 3, and an air inlet is provided on the upper side wall of the second fan 23. A second heat dissipation channel 24 is formed between the front heat insulation glass 44 and the LCD screen frame assembly 43. The air outlet of the second fan 23 is connected to the lower end of the second heat dissipation channel 24, and the upper end of the second heat dissipation channel 24 is connected to the upper part of the right cavity. Therefore, the airflow blown out by the second fan 23 will flow in through the lower end of the second heat dissipation channel 24 and flow into the upper part of the right cavity from the upper end of the second heat dissipation channel 24. The upper part of the right cavity enters the air inlet located on the upper side wall of the second fan 23 through the light chamber 3 to realize the circulation of airflow. At the same time, during the airflow process, the heat on the surface of the light chamber 3, the front heat insulation glass 44, and the front mirror 45 will be carried away. When the airflow passes through the heat dissipation plate embedded on the side wall of the right cavity, the heat will be transferred to the heat dissipation plate, thereby achieving the purpose of heat dissipation and cooling of the light chamber 3, the front heat insulation glass 44, the front mirror 45, and the interior of the right cavity.

[0053] Therefore, in this utility model, the interior of the housing 1 is divided into a left cavity and a right cavity by the LCD screen frame assembly 43 and the connecting plate 7, and fans are respectively installed in the left cavity and the right cavity to dissipate heat from the components inside the left cavity and the right cavity, thereby effectively improving the heat dissipation effect of each component inside the housing 1, which is conducive to the long-term stable operation of the entire projector.

[0054] This utility model also provides a projector, including a housing and a projector optical engine with a novel heat dissipation duct structure as described above, wherein the projector optical engine with the novel heat dissipation duct structure is disposed inside the housing. In the technical solution provided by this utility model, the rotation of the LCD screen frame assembly 43 is precisely controlled by software and structural components to achieve the purpose of controlling the depth of field, without affecting the heat dissipation effect of the heat dissipation duct. On the other hand, the interior of the housing 1 is divided into a left cavity and a right cavity by the LCD screen frame assembly 43 and the connecting plate 7, and fans and heat dissipation ducts are respectively provided in the left cavity and the right cavity to dissipate heat from the components inside the left cavity and the right cavity, effectively improving the overall heat dissipation effect of the projector.

[0055] Example 2: A projector optical engine with a novel heat dissipation duct structure, comprising a housing 1, a light source plate 2, a light chamber 3, a lens module 4, a reflector 5, and a projection lens 6.

[0056] The light source plate 2, light chamber 3, reflector 5, and lens module 4 are arranged inside the housing 1. A projection port is provided on the lower left side of the housing 1. The upper end of the projection lens 6 is located inside the projection port to connect with the housing 1. The reflector 5 is tilted above the projection lens 6. The lens module 4 is located to the right of the reflector 5. The light chamber 3 is located to the right of the lens module 4. The light source plate 2 is installed on the inner wall of the right end of the housing 1. The left end of the light chamber 3 is connected to the right end of the lens module 4, and the right end is connected to the light source plate 2. Therefore, the light emitted by the light source plate 2 will be transmitted to the projection lens 6 through the lens module 4 and the reflector 5, and then projected onto an external projection surface such as a screen to realize the projection operation.

[0057] The lens module 4 includes a rear glass 41, a rear heat insulation glass 42, an LCD screen frame assembly 43, a front heat insulation glass 44 and a front glass 45 arranged from left to right. The LCD screen frame assembly 43 is rotatably disposed inside the housing 1.

[0058] Specifically, the LCD screen frame assembly 43 includes a screen frame frame and an LCD screen body disposed inside the screen frame frame. The upper and lower ends of the screen frame frame are connected to the housing 1 by connecting plates 7, which are made of elastic material.

[0059] A pivot 8 is located at the center of the front end of the screen frame, and a fixed bracket 9 is located on the side wall of the housing 1 at a position corresponding to the pivot 8. The front end of the pivot 8 is rotatably connected to the fixed bracket 9.

[0060] The front end of the screen frame is also provided with a movable arm 10, and the middle part of the movable arm 10 is rotatably connected to the fixed bracket 9.

[0061] A first motor 25 and a first detection box 26 are provided on the surface of the right end of the housing 1. A gear 27 is provided on the main shaft of the first motor 25. Multiple gear teeth 28 are continuously provided on the right end face of the movable arm 10. The gear 27 meshes with the gear teeth 28 on the right end face of the movable arm 10. The right end face of the movable arm 10 is an inclined surface that tilts to the left. A limit block 29 is provided on the front end face of the first motor 26, and the limit block 29 is located above the right end of the movable arm 10.

[0062] The first detection box 26 is equipped with a position detection optical coupler 18. The first detection box 26 is located below the right end of the movable arm 10. Other structures are the same as those in the above embodiment.

[0063] As can be seen from the above technology, when it is necessary to adjust the angle of the LCD screen frame assembly 43, the first motor 25 is controlled to rotate forward or backward by the controller and corresponding control elements of the projector. In this way, the first motor 25 drives the right end of the movable arm 10 to shift up and down through the gear 27. At the same time, the movable arm 10 and the screen frame are rotatably connected to the fixed bracket 9. Therefore, while the right end of the movable arm 10 shifts up and down, the left end of the movable arm 10 and the entire LCD screen frame assembly 43 will deflect accordingly. With the help of the position detection optocoupler 18, the controller and corresponding control elements of the projector, the rotation angle of the entire LCD screen frame assembly 43 can be precisely controlled. On the other hand, when the right end of the movable arm 10 shifts upward and contacts the limiting block 29, the right end of the movable arm 10 shifts upward to the limit position. When the right end of the movable arm 10 shifts downward and contacts the top of the first detection box 26, the right end of the movable arm 10 shifts downward to the limit position. This achieves the physical limiting effect on the up and down shift of the right end of the movable arm 10.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A projector optical engine with a novel heat dissipation duct structure, characterized in that, Includes housing, light source board, light chamber, lens module, reflector, and projection lens. The light source plate, light chamber, reflector, and lens module are disposed inside the housing. A projection port is provided on the lower left side of the housing. The upper end of the projection lens is located inside the projection port. The reflector is obliquely disposed above the projection lens. The lens module is located to the right of the reflector. The light chamber is located to the right of the lens module. The light source plate is mounted on the inner wall of the right end of the housing. The left end of the light chamber is connected to the right end of the lens module, and the right end is connected to the light source plate. The lens module includes a rear lens, a rear heat-insulating glass, an LCD screen frame assembly, a front heat-insulating glass, and a front lens arranged sequentially from left to right. The LCD screen frame assembly is rotatably disposed inside the housing.

2. The projector optical engine with a novel heat dissipation duct structure according to claim 1, characterized in that, The LCD screen frame assembly includes a screen frame and an LCD screen body disposed inside the screen frame. The upper and lower ends of the screen frame are connected to the housing by connecting plates made of elastic material. A pivot is provided at the middle position of the front end of the screen frame, and a fixed bracket is provided on the side wall of the housing at a position corresponding to the pivot. The front end of the pivot is rotatably connected to the fixed bracket. The front end of the screen frame is also provided with a movable arm, and the middle part of the movable arm is rotatably connected to the fixed bracket. A first motor and a first detection box are disposed on the surface of the right end of the housing. A gear is disposed on the main shaft of the first motor. Multiple gear teeth are continuously disposed on the right end face of the movable arm. The gear meshes with the gear teeth on the right end face of the movable arm. The right end face of the movable arm is an inclined surface. A limit block is disposed on the front end face of the first motor, and the limit block is located above the right end of the movable arm. The first detection box is equipped with a position detection optical coupler inside, and the first detection box is located below the right end of the movable arm.

3. A projector optical engine with a novel heat dissipation duct structure according to claim 1, characterized in that, The LCD screen frame assembly includes a screen frame and an LCD screen body disposed inside the screen frame. The upper and lower ends of the screen frame are connected to the housing by connecting plates made of elastic material. A pivot is provided at the middle position of the front end of the screen frame, and a fixed bracket is provided on the side wall of the housing at a position corresponding to the pivot. The front end of the pivot is rotatably connected to the fixed bracket. The front end of the screen frame is also provided with a movable arm, and the middle part of the movable arm is rotatably connected to the fixed bracket. A power box and a second detection box are provided on the surface of the right end of the housing, with the second detection box located above the power box. The power box contains a movable rod with a slider sliding along it. A second motor is mounted on the lower side wall of the power box, and a lead screw is connected to the upper end of the second motor's main shaft. The upper end of the lead screw passes through the lower side wall of the power box and is rotatably connected to its upper side wall. The rear side wall of the slider is threaded to achieve a threaded connection with the lead screw and drive the slider to move up and down. The front side wall of the slider has a first transverse groove. The right end of the movable arm passes through the housing and is inserted into the first groove from its left end. The second detection box is equipped with a position detection optical coupler inside. The position detection optical coupler is provided with a longitudinal second groove. The upper end of the movable arm is provided with a detection arm. The upper end of the detection arm penetrates the bottom wall of the second detection box upward and is inserted into the second groove from the lower end. The left side of the detection arm is an inclined surface.

4. A projector optical engine with a novel heat dissipation duct structure according to claim 3, characterized in that, The two sidewalls of the first and second grooves are arranged parallel to each other. The width of the upper end of the detection arm is smaller than the width of its lower end, and its right side is arranged parallel to the sidewall of the second groove.

5. A projector optical engine with a novel heat dissipation duct structure according to claim 2 or 3, characterized in that, The LCD screen frame assembly and its connecting plates at both ends divide the inner cavity of the housing into a left cavity and a right cavity. The reflector, rear Fresnel lens, and rear heat-insulating glass are located inside the left cavity, and the projection lens is located on the lower left side of the left cavity. The front heat-insulating glass, front mirror, light source plate, and light chamber are located inside the right cavity. Heat dissipation plates are respectively embedded in the side walls of the left and right cavities.

6. A projector optical engine with a novel heat dissipation duct structure according to claim 5, characterized in that, A first fan is provided above the reflector, and an air inlet is provided on the lower side wall of the first fan. A first heat dissipation channel is formed between the rear heat insulation glass and the LCD screen frame assembly. The air outlet of the first fan is connected to the upper end of the first heat dissipation channel, and the lower end of the first heat dissipation channel is connected to the lower part of the left cavity.

7. A projector optical engine with a novel heat dissipation duct structure according to claim 6, characterized in that, A second fan is provided below the light chamber, and an air inlet is provided on the upper side wall of the second fan. A second heat dissipation channel is formed between the front heat insulation glass and the LCD screen frame assembly. The air outlet of the second fan is connected to the lower end of the second heat dissipation channel, and the upper end of the second heat dissipation channel is connected to the upper part of the right cavity.

8. A projector, comprising a housing, characterized in that, It also includes a projector optical engine with a novel heat dissipation duct structure as described in any one of claims 1-7, wherein the projector optical engine with the novel heat dissipation duct structure is disposed inside the housing.

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