Patent Publication Number: US-2021191241-A1

Title: Projector

Description:
TECHNICAL FIELD 
     The present disclosure relates to the field of optics, and in particular, to an engineering projector. 
     BACKGROUND 
     For example, for an engineering projector with a direct-projective and interchangeable lens, the lens thereof is located at a substantially middle position of a front portion of the machine, and is also just located at a middle position between an air inlet and an air outlet of the entire machine. In this housing, a light-entering surface of the lens is easily contaminated by dust brought into the air duct, and as a result, maintenance of the lens is frequently required. 
     SUMMARY 
     Technical Problems 
     In addition, a connection line is provided on a lens holder and is very close to the lens. As a result, the connecting line on the lens holder sometimes will be blocked or clamped when the lens is being disassembled and replaced, which prevents smooth replacement of the lens. 
     Therefore, it is necessary to provide a new projector to solve the problems described above. 
     Solutions to the Problems 
     A main technical problem to be solved by the present disclosure is to provide a projector with a lens protective cover, so as to solve the problems in the prior art that dust easily enters the lens, it is difficult to maintain the lens and inconvenient to disassemble the lens. 
     In order to solve the technical problems described above, a technical solution provided by the present disclosure is to provide a projector. The projector includes a housing having an air inlet surface and an air outlet surface; and a lens module located in the housing. The air inlet surface is provided with an air inlet thereon, the air outlet surface is provided with an air outlet thereon, and an air passage for gas flow is formed between the air inlet and the air outlet. The lens module includes a lens and a protective cover arranged at a periphery of the lens for isolating the lens from the air passage. 
     Preferably, the air inlet surface is opposite to the air outlet surface, and the lens module is located between the air inlet surface and the air outlet surface. 
     Preferably, the projector further includes a mainboard, a heat radiator, a laser device, and a color wheel assembly that are arranged between the air inlet surface and the air outlet surface. 
     Preferably, the heat radiator is located between the air inlet and the lens module, and the protective cover includes a first surface close to the heat radiator, a second surface opposite to the first surface, and a third surface connecting the first surface with the second surface. 
     Preferably, a first fixing portion connected to the housing is provided on the first surface, and a second fixing portion connected to the housing is provided on the second surface. 
     Preferably, a fan corresponding to the air outlet is provided at the air outlet. 
     Preferably, the housing includes a lens mounting surface connecting the air inlet surface with the air outlet surface, and the lens mounting surface is provided with a lens mounting hole. 
     Preferably, the lens module further includes a lens holder connected to the housing and configured to fix the lens and the protective cover, and the lens holder is disposed corresponding to the lens mounting hole. 
     Preferably, a slot is provided at a side of the third surface close to the lens holder, and the slot is fixed to the lens holder by clamping. 
     Preferably, the third surface is provided with fixing holes arranged at two sides of the slot; and the protective cover is fixed to the lens holder through the fixing holes. 
     Preferably, an avoiding portion for the lens is provided at a side of the third surface close to the housing, and the protective cover abuts against an edge of the lens through the avoiding portion. 
     Preferably, the projector includes a lens connection line which is electrically connected to the lens through the lens holder, a receiving space for the lens is formed between the protective cover and the housing, and the lens connection line is located outside the receiving space. 
     Beneficial Effects 
     The beneficial effects of the present disclosure are that, different from the prior art, the present disclosure provides a projector, in which a protective cover is provided on the lens to prevent dust from entering the lens and isolates the lens from an internal space of the projector, facilitating disassembly and maintenance of the lens, providing a good user experience. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic diagram of a partially assembled structure of a projector without a lens according to the present disclosure; 
         FIG. 2  is a schematic diagram of a partially assembled structure of a projector omitting a partial housing according to the present disclosure; 
         FIG. 3  is a schematic diagram of a structure of a protective cover of a projector according to the present disclosure; and 
         FIG. 4  is a schematic diagram of an internal assembly of a projector according to the present disclosure. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     It should be understood that specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the present disclosure. 
     As shown in  FIG. 1  and  FIG. 2 , an embodiment of the present disclosure provides a projector, including a housing  1  having a receiving space, and a mainboard  2 , a lens module, a heat radiator  7 , a laser device, and a color wheel assembly received in the housing  1 . 
     The housing  1  includes an air inlet surface  11  and an air outlet surface  12  that are perpendicular to the mainboard  2 , and a top surface  13  and a bottom surface that connect the air inlet surface  11  with the air outlet surface  12 . The lens module, the heat radiator  7 , and the color wheel assembly are all located between the air inlet surface  11  and the air outlet surface  12 . The mainboard  2  is fixed on the bottom surface of the housing  1 . In this embodiment, the mainboard  2  is an independent integrated circuit board fixed on the bottom surface of the housing  1 , and a plurality of sockets with different functions can be arranged thereon. Specifically, in the embodiment, the mainboard  2  is provided with a plurality of module sockets, a power supply control socket, and a DMD socket. In other alternative embodiments, the mainboard  2  may also be integrated with the housing  1  at the bottom of the housing  1 . Moreover, the mainboard  2  may cover an entire bottom space of the projector or may occupy only a partial space inside the housing, and it is implementable as long as integration is affected. 
     The air inlet surface  11  is provided with an air inlet, and the air outlet surface  12  is provided with an air outlet  121 . The air inlet of the air inlet surface  11  is disposed corresponding to the air outlet  121  of the air outlet surface  12  to form an air passage for gas flow. Further, a fan  6  is provided corresponding to the air outlet  121  for promoting gas flow and enhancing heat dissipation inside the projector. 
     The lens module includes a lens  3 , a lens holder  4  for fixing the lens  3 , and a protective cover  5 . Further, the housing  1  further includes a lens mounting surface  14  connecting the air inlet surface  11  with the air outlet surface  12  and located between the top surface  12  and the bottom surface. The lens mounting surface  14  is provided with a lens mounting hole  141 . The lens  3  is inserted into the housing  1  through the lens mounting hole  141 . A light incident direction of the lens  3  is perpendicular to a flow direction of the gas in the air passage. That is, the lens  3  is located on an air receiving surface of the projector. 
     The lens holder  4  is disposed corresponding to the lens mounting hole  141  to form a mounting position for the lens  3 . A lens connection line (or lens connection lines) arranged on the lens holder  4  electrically connects the lens  3  with the mainboard  2 , and the lens connection line (or lens connection lines) of the projector is fixed and connected to the lens holder  4 . 
     The protective cover  5  is arranged at a periphery of the lens  3 , for isolating the lens from the air passage. As shown in  FIG. 3 , the protective cover  5  includes a first surface  51  disposed opposite to the air inlet surface  11 , a second surface  52  disposed opposite to the air outlet surface  12 , and a third surface  53  connecting the first surface  51  with the second surface  52 . A first fixing portion  511  connected to the mainboard  2  is provided at a side of the first surface  51  close to the mainboard  2 , and a second fixing portion  521  connected to the mainboard  2  is provided at a side of the second surface  52  close to the mainboard  2 . The protective cover  5  and the housing  1  form a gap around the lens mounting position, in which the receiving space for the lens  3  is formed, and the lens connection line is isolated to be outside the receiving space. In this way, when the lens is disassembled, it is convenient to replace the lens and avoids blocking or clamping the lens connection line to influence reliability of the product. Moreover, an internal space of the projector will not be observed when the lens is disassembled and replaced, thereby ensuring an aesthetic appearance of the product. 
     A slot  531  is provided at a side of the third surface  53  that is close to the lens holder  4  and away from the lens mounting surface, and the slot  531  is fixed to the lens holder  4  by clamping. Correspondingly, a buckle or a step corresponding thereto is provided on the lens holder, so as to improve fixing reliability of the protective cover  5  and the lens holder  4 . 
     Further, the third surface  53  is further provided with fixing holes  532 . Specifically, in this embodiment, two fixing holes  532  are provided and respectively disposed at two sides of the slot  531 , for further fixing of the holder  4  and the protective cover. With the fixing holes  532 , the fixing holder  4  can be provided with protrusion points or protrusion pillars matched thereto; or with the fixing holes  532 , screw fixing can be performed, all of which can be implemented. 
     Further, an avoiding portion  533  for the lens is provided at a side of the third surface  53  close to the lens mounting surface, and the protective cover  5  abuts against an edge of the lens  3  through the avoiding portion  533 . In this way, the lens  3 , the protective cover  5  and the lens holder  4  form an integral structure, which plays a dustproof role on the whole. 
     With reference to  FIG. 4 , the color wheel assembly includes a color wheel and a color wheel driving device. The laser device is used to emit laser light and generates a lot of heat during operation as a main heat source of the projector. Moreover, a DMD driving device for adjusting imaging and a power supply control board electrically connected to the power supply control board socket on the mainboard may be further provided in the projector and likewise generate heat. Correspondingly, the heat radiator  7  is arranged at an upper layer of the laser device in a heat conductive manner. Specifically, in this embodiment, the laser device and the heat radiator are located between the air inlet and the lens module. An air flow from the air let passes through the heat radiator to cool the projector, and then passes the lens module to flow out from the air outlet under driving of the fan  6 , thereby achieving heat dissipation inside the projector. 
     Different from the prior art, the present disclosure provides a projector, in which a protective cover is provided on the lens to prevent dust from entering the lens and isolates the lens from an internal space of the projector, facilitating disassembly and maintenance of the lens, providing a good user experience. 
     The above description is merely embodiments of the present disclosure, and not intended to limit the scope of the present disclosure. Any equivalent structures or equivalent process transformations using the specification and companying drawings of the present disclosure, or directly or indirectly applications in other related technical fields are all within the protection scope of the present disclosure.