Projector

Abstract

The utility model discloses a projector, which relates to the technical field of projection and comprises a shell, a projection assembly, a medium-efficient filter screen and a fan. A first containing cavity and a second containing cavity which communicate with each other are formed in the shell. The projection assembly is arranged in the first accommodating cavity. And the medium-high-efficiency filter screen is arranged in the second accommodating cavity. The draught fan is arranged in the first containing cavity and used for sucking air in the second containing cavity so that the air passing through the medium-efficient filter screen can enter the first containing cavity from the second containing cavity. According to the technical scheme provided by the utility model, the projection effect of the projector can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to projection technology field, especially a kind of projector. BACKGROUND

[0002] High-power light source and spatial light modulator are built-in projector, on the one hand, a large amount of heat will inevitably be generated, on the other hand, precise spatial light modulator cannot work at too high temperature, so projector needs better heat dissipation system.For this reason, in the related art, fan is used to blow air into projector to cool down, but this will make more dust in projector, dust will block projection light path, affect projection effect.Therefore, a kind of projector with good heat dissipation but better projection effect is needed. SUMMARY

[0003] The main purpose of the utility model is to provide a kind of projector, to improve the projection effect of projector.

[0004] To achieve the above object, the utility model provides a kind of projector, including:

[0005] Shell, first accommodating cavity and second accommodating cavity are formed with intercommunication in the inside;

[0006] Projection assembly is set in the first accommodating cavity;

[0007] Medium high-efficiency filter screen is set in the second accommodating cavity;And

[0008] Fan is set in the first accommodating cavity, and is used to suck the gas in the second accommodating cavity, so that the air passing through the medium high-efficiency filter screen enters the first accommodating cavity from the second accommodating cavity.

[0009] In some embodiments, the shell includes first shell and second shell, the first accommodating cavity is set in the first shell, and the second accommodating cavity is set in the second shell;The second shell is set on the outside of the first shell;The first shell and the second shell are separately set or integrally set.

[0010] In some embodiments, the first shell includes first end wall and first side wall, and the first side wall extends from the first end wall edge to the side of the first end wall;

[0011] The second shell includes second side wall and second end wall, and the second side wall is set on the side of the first end wall away from the first side wall, and extends from the first end wall edge to the direction away from the first side wall;

[0012] The second end wall is arranged on the edge of the second side wall away from the first end wall and cooperates with the first end wall to enclose the second accommodating cavity; the second end wall is provided with a mounting cavity recessed towards the first end wall and into the second accommodating cavity, and the middle high-efficiency filter screen is arranged in the mounting cavity.

[0013] In some embodiments, the middle high-efficiency filter screen is in a plate shape, and in a projection plane parallel to the middle high-efficiency filter screen, an area of a projection of the middle high-efficiency filter screen onto the projection plane is 90% or more of an area of a projection of the first end wall onto the projection plane; and / or

[0014] The middle high-efficiency filter screen is a HEPA filter screen.

[0015] In some embodiments, the second shell further comprises a mounting wall and a limiting rib, the mounting wall extends from the second end wall to the first end wall and surrounds the mounting cavity, and the limiting rib extends from the edge of the first end wall into the mounting cavity and abuts against a side of the middle high-efficiency filter screen facing the first end wall; the limiting rib is at least partially spaced apart from the first end wall to form an air suction cavity between the limiting rib and the first end wall.

[0016] In some embodiments, the first end wall is provided with an air inlet communicating with the second accommodating cavity; the middle high-efficiency filter screen is in a plate shape, and in a projection plane parallel to the middle high-efficiency filter screen, a projection of the air inlet onto the projection plane is outside a projection of the air suction cavity onto the projection plane; and / or

[0017] The projector further comprises a grid arranged on a side of the middle high-efficiency filter screen away from the limiting rib and abutting against the middle high-efficiency filter screen.

[0018] In some embodiments, the second shell further comprises a sealing part arranged in the second accommodating cavity; the first shell is provided with an air outlet, and the sealing part is used to seal a part of the air outlet exposed in the second accommodating cavity.

[0019] In some embodiments, the fan comprises a centrifugal fan and an axial fan; the centrifugal fan and the axial fan are both arranged in the first accommodating cavity; the centrifugal fan is used to suck air from the second accommodating cavity into the first accommodating cavity; and the axial fan is used to push air in the first accommodating cavity out of the first accommodating cavity.

[0020] In some embodiments, the projection component comprises a light source, a heat conducting member and a heat dissipation fin arranged in the first accommodating cavity; one end of the heat conducting member is in heat conducting connection with the light source, and the other end is in heat conducting connection with the heat dissipation fin; the axial flow fan is used for conveying gas to the heat dissipation fin, so that the gas is discharged from the projector after passing through the heat dissipation fin; and / or

[0021] The projector further comprises a spatial light modulator arranged in the first accommodating cavity; the spatial light modulator is plate-shaped and is formed with a central air duct having opposite first and second ends; the first shell is formed with an arc-shaped air duct which is in communication with the first end of the central air duct and extends away from the spatial light modulator along the surface normal of the spatial light modulator; the centrifugal fan is used for conveying air to one end of the arc-shaped air duct away from the first end; the first shell is further formed with an air outlet cavity which is in communication with the second end of the central air duct and extends away from the arc-shaped air duct along the surface normal of the spatial light modulator; and the axial flow fan is arranged in the air outlet cavity away from the central air duct.

[0022] In some embodiments, the spatial light modulator of the projector comprises a Fresnel lens, an LCD panel and a polarization panel which are spaced apart from each other, parallel to each other and arranged in sequence; and the central air duct is formed between the Fresnel lens and the LCD panel and between the LCD panel and the polarization panel.

[0023] In the technical scheme of the projector, the airflow entering the first shell through the suction of the fan is filtered by the high-efficiency filter screen, so that the gas entering the projector is free of large particles of dust, and the sufficient heat dissipation effect can be achieved without introducing particulate matter to hinder the propagation of light, thereby improving the projection effect of the projector. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained from the structures shown in the drawings without creative labor for those skilled in the art.

[0025] Figure 1 A three-dimensional assembly structure schematic diagram of an embodiment of the projector provided by the present application is shown in the figure.

[0026] Figure 2 A first exploded structure schematic diagram of the projector is shown in the figure. Figure 1 A first exploded structure schematic diagram of the projector is shown in the figure.

[0027] Figure 3 Fig. 6 is a bottom perspective view of the projection device in the first embodiment; Figure 1 Fig. 7 is a bottom perspective view of the projection device in the first embodiment;

[0028] Figure 4 Fig. 8 is a sectional view of the projection device in the first embodiment along the A-A direction; Figure 1 Fig. 9 is a second exploded view of the projection device in the first embodiment; Figure 3 Fig. 10 is a sectional view of the projection device in the first embodiment along the A-A direction;

[0029] Figure 5 Fig. 11 is a third exploded view of the projection device in the first embodiment; Figure 1 Fig. 12 is a view of the projection device in the first embodiment after removing the top cover;

[0030] Figure 6 Fig. 13 is a view of the projection device in the first embodiment after removing the top cover and the centrifugal fan; Figure 1 Fig. 14 is a view of the first housing of the projection device in the first embodiment;

[0031] Figure 7 Fig. 15 is a top perspective view of the projection device in the first embodiment after removing the top cover; Figure 1 Fig. 16 is a top perspective view of the projection device in the first embodiment after removing the top cover and the centrifugal fan;

[0032] Figure 8 Fig. 17 is a sectional view of the first housing of the projection device in the first embodiment along the A-A direction; Figure 1 Fig. 18 is a sectional view of the first housing of the projection device in the first embodiment along the A-A direction;

[0033] Figure 9 Fig. 19 is a sectional view of the first housing of the projection device in the first embodiment along the A-A direction; Figure 1 Fig. 20 is a sectional view of the first housing of the projection device in the first embodiment along the A-A direction;

[0034] Figure 10 Fig. 21 is an assembly view of the light source, the heat-conducting member and the heat-dissipating fins of the projection device in the first embodiment. Figure 1 BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Fig. 1 is a perspective view of the projection device in the first embodiment;

[0036] Fig. 2 is a sectional view of the projection device in the first embodiment along the A-A direction;

[0037] Fig. 3 is a sectional view of the projection device in the first embodiment along the A-A direction;

[0038] Fig. 4 is a sectional view of the projection device in the first embodiment along the A-A direction;

[0039] Fig. 5 is a sectional view of the projection device in the first embodiment along the A-A direction;

[0040] Fig. 6 is a bottom perspective view of the projection device in the first embodiment;

[0041] Fan 15; centrifugal fan 151; axial fan 152;

[0042] Grating 16;

[0043] Air duct cover 17;

[0044] Top cover 18.

[0045] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0048] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0049] The present application provides a projector.

[0050] Please refer to Figure 1 and Figure 2In an embodiment of the present application, the projector 10 comprises a housing, a projection assembly 12, a medium-high efficiency filter 14 and a fan 15. The housing has a first accommodating cavity 111 and a second accommodating cavity 131 formed therein and in communication with each other. The projection assembly 12 is arranged in the first accommodating cavity 111. The medium-high efficiency filter 14 is arranged in the second accommodating cavity 131. The fan 15 is arranged in the first accommodating cavity 111 and is used to suck the air in the second accommodating cavity 131 so that the air passing through the medium-high efficiency filter 14 enters the first accommodating cavity 111 from the second accommodating cavity 131.

[0051] The housing is the installation base of various devices in the projector. The first accommodating cavity 111 and the second accommodating cavity 131 formed in the housing are spaces for installing various devices. In some embodiments, the first accommodating cavity 111 can be used to install functional devices of the projector 10, i.e. various devices in the projection assembly 12 and other devices with playing function, such as a loudspeaker, etc.

[0052] The second accommodating cavity 131 can be used to accommodate the medium-high efficiency filter 14 to fix the medium-high efficiency filter 14 in the housing. The first accommodating cavity 111 and the second accommodating cavity 131 can directly form a complete cavity to be in communication; the first accommodating cavity 111 and the second accommodating cavity 131 can also be in communication through the air inlet (air inlet 1121) as shown in the embodiments below. Figure 2

[0053] The projection assembly 12 is a component of the projector 10 for modulating light into projection light and projecting the projection light. It usually comprises a light source, a light modulator and a lens. Please refer to Figure 6 and Figure 10 In the embodiments shown in Figure 6 and Figure 10 , the projection assembly 12 comprises a light source 121, a condenser cup 125, a spatial light modulator 124, a reflecting plate 126 and a lens group 127; the light source 121 generates available light, the condenser cup 125 shapes the light of the light source 121 into incident light of the spatial light modulator 124; the spatial light modulator 124 loads image information into its outgoing light; the reflecting plate 126 reflects the projection light with image information to be incident on the lens group 127; and the lens group 127 finally projects the light with image information out of the projector 10 to form a projection image. In some embodiments, the lens group 127 can be focused so that the projection image can be formed on a projection surface at different distances from the projector 10.

[0054] ​In some other embodiments, the projection assembly 12 can be of other configurations. In one example, the projector can employ a reflective spatial light modulator; and can be provided with a combiner, and the light source can generate three colors of light, the spatial light modulator modulates different colors of light respectively, and the combiner combines the modulated three colors of light and finally inputs the light into the lens group to project the projector.

[0055] The first accommodating cavity 111 and the second accommodating cavity 131 are communicated, so that the fan 15 arranged in the first accommodating cavity 111 can draw air from the second accommodating cavity 131 and send it into the first accommodating cavity 111. The fan can be an axial fan, a cross-flow fan, a centrifugal fan, etc.

[0056] The medium-high efficiency filter screen 14 is a gas filter screen, which can be a high efficiency particulate air (HEPA) filter screen, a sub-HEPA filter screen or a medium efficiency filter screen. The medium-high efficiency filter screen 14 has good filtering effect on gas and high filtering efficiency, so as to ensure low air suction resistance and large air intake, to ensure heat dissipation of the projector 10 and avoid large particles from entering the projector 10, especially to effectively avoid particles with a diameter of 2.5 μm or more from entering the projector 10. In this way, there is no particulate matter in the projector 10 to hinder the projection of light, so as to improve the projection effect of the projector 10.

[0057] Please refer to Figure 1 and Figure 2 In some embodiments, the housing includes a first housing 11 and a second housing 13, the first accommodating cavity 111 is arranged in the first housing 11, and the second accommodating cavity 131 is arranged in the second housing 13; the second housing 13 is arranged outside the first housing 11; the first housing 11 and the second housing 13 are arranged separately or integrally.

[0058] The first housing 11 can be a main housing of the projector 10, and the first housing 11 can be enclosed with the top cover 18 to enclose the first accommodating cavity 111. The first housing 11 can be provided with a window for the projection light to exit, so as to project an image on a target projection surface. The first housing 11 can be provided with a sound transmission grille 16, so that the loudspeaker arranged in the first accommodating cavity 111 can transmit sound to the outside of the projector 10 for the user to listen to.

[0059] The second accommodating cavity 131 formed by the second housing 13 provides mounting space for the medium-high efficiency filter screen 14, and the second housing 13 is a mounting base of the medium-high efficiency filter screen 14. The second housing 13 is arranged outside the first housing 11, which means that the second housing 13 is at least partially exposed outside the first accommodating cavity 111.

[0060] The second shell 13 can be integrally arranged with the first shell 11, or can be separately arranged with the first shell 11. When the second shell 13 is separately arranged with the first shell 11, the second shell 13 can be screw-connected, riveted, adhered and / or buckled with the first shell 11. In particular, please refer to Figure 1 In some embodiments, the first shell 11 and the second shell 13 are aligned in the front-rear and left-right directions of the projector 10, which increases the integrity of the projector 10 and is beneficial to the transportation and storage of the projector 10.

[0061] When the first shell 11 and the second shell 13 are integrally arranged, the first shell 11 and the second shell 13 can be integrally injection molded, or secondarily injection molded, or integrally arranged in the form of welding.

[0062] The separate arrangement of the first shell 11 and the second shell 13 can make the molding of the first shell 11 and the second shell 13 simpler and easier to implement. The integral arrangement of the first shell 11 and the second shell 13 can improve the connection strength of the first shell 11 and the second shell 13, and make the projector more integrated.

[0063] Please refer to Figure 1 The second shell 13 can be arranged below the first shell 11, and in other embodiments, the second shell 13 can also be arranged above the first shell 11 (i.e. in the position of the top cover in Figure 2

[0064] Please refer to Figures 3 to 5 In some embodiments, the first shell 11 includes a first end wall 112 and a first side wall 113, the first side wall 113 extending from the edge of the first end wall 112 to one side of the first end wall 112;

[0065] The second shell 13 includes a second side wall 132 and a second end wall 133, the second side wall 132 being arranged on the side of the first end wall 112 away from the first side wall 113 and extending from the edge of the first end wall 112 away from the first side wall 113;

[0066] The second end wall 133 is arranged on the edge of the second side wall 132 away from the first end wall 112 and cooperates with the first end wall 112 to enclose the second accommodating cavity 131; the second end wall 133 is provided with a mounting cavity 1331 recessed toward the first end wall 112 and into the second accommodating cavity 131, and the high-efficiency filter screen 14 is arranged in the mounting cavity 1331.

[0067] The first end wall 112 can be a bottom wall or a top wall of the first shell 11. When the first end wall 112 is a bottom wall of the first shell, the second end wall 133 is a bottom wall of the second shell 13; when the first end wall 112 is a top wall of the first shell 11, the second end wall 133 is a top wall of the second shell 13. ​

[0068] Since the various components of the projection assembly 12 can be installed on the first end wall 112 within the first receiving cavity 111, the surface area of ​​the first end wall 112 is often the largest surface area of ​​the wall on the first housing 11. The second housing 13, located on one side of the first end wall 112, can have a larger mounting area, or in other words, the second receiving cavity 131 can have a larger bottom area. The mounting cavity 1331 is recessed into the second receiving cavity 131, therefore the second receiving cavity 131 has a larger bottom area, and the mounting cavity 1331 can also have a larger bottom area. The medium-high efficiency filter 14 is typically plate-shaped, and the large bottom area of ​​the mounting cavity 1331 allows for the installation of a larger medium-high efficiency filter 14. The filtration resistance of the medium-high efficiency filter 14 is negatively correlated with its surface area. Therefore, this arrangement can increase the surface area of ​​the medium-high efficiency filter 14, thereby reducing the filtration resistance, increasing the air intake into the first receiving cavity 111, and improving the heat dissipation efficiency of the projector 10.

[0069] Please refer to Figure 4 In some embodiments, the medium- and high-efficiency filter 14 is plate-shaped, and on a projection plane parallel to the medium- and high-efficiency filter 14, the area of ​​the medium- and high-efficiency filter 14 projected onto the projection plane is 90% or more of the area of ​​the first end wall 112 projected onto the projection plane.

[0070] Figure 4 The projection plane shown by the dashed line is Figure 4 The medium-efficiency filter 14 of the projector 10 is parallel to a projection surface. Along Figure 4 The arrow-directed projection is the orthographic projection onto the projection surface. On the aforementioned projection surface, if the area of ​​the orthographic projection of the medium-high efficiency filter 14 is 90% or more of the area of ​​the orthographic projection of the first end wall 112, the area of ​​the medium-high efficiency filter 14 can be large enough, thereby making the filtration resistance of the medium-high efficiency filter 14 sufficiently low, increasing the airflow of the fan 15 to the first receiving cavity 111, and improving the heat dissipation capacity of the projector 10.

[0071] In some implementations, the medium-efficiency filter 14 is a HEPA filter. HEPA filters are high-efficiency filters, which can have lower filtration resistance and higher filtration efficiency, thereby improving the projection effect and heat dissipation capacity of the projector 10.

[0072] Please refer to Figure 4 and Figure 5In some embodiments, the second housing 13 further includes a mounting wall 134 and a limiting rib 135. The mounting wall 134 extends from the second end wall 133 toward the first end wall 112 and surrounds the mounting cavity 1331. The limiting rib 135 extends from the edge of the first end wall 112 toward the mounting cavity 1331 and abuts against the side of the medium-high efficiency filter 14 toward the first end wall 112. The limiting rib 135 is at least partially spaced from the first end wall 112 to form an air intake cavity 136 between the limiting rib 135 and the first end wall 112.

[0073] The limiting rib 135 can limit the medium- and high-efficiency filter 14, preventing it from being attracted by negative pressure and contacting the first end wall 112. This ensures that the first end wall 112 and the medium- and high-efficiency filter 14 remain separated, forming an air intake chamber 136. The air intake chamber 136 fully exposes the outlet side of the medium- and high-efficiency filter 14, ensuring that all parts of the filter 14 can participate in filtration without any areas not participating due to obstruction. This increases the effective filtration area of ​​the medium- and high-efficiency filter 14, thereby reducing filtration resistance.

[0074] Please refer to Figure 4 and Figure 7 In some embodiments, an air inlet 1121 communicating with the second receiving cavity 131 is provided on the first end wall 112; the medium and high efficiency filter 14 is plate-shaped, and on a projection surface parallel to the medium and high efficiency filter 14, the projection of the air inlet 1121 onto the projection surface is outside the projection of the air intake cavity 136 onto the projection surface.

[0075] In one example, namely Figure 4 On the projection surface shown, along Figure 4 Projecting in the direction of the middle arrow onto the projection plane shown by the dotted line, the projection of the air inlet 1121 is outside the projection of the intake chamber 136. This arrangement ensures that the air inlet 1121 is not directly opposite the intake chamber 136, and thus not directly opposite the medium-efficiency filter 14. It is known that the negative pressure is greatest at the air inlet 1121. By preventing the air inlet 1121 from being directly opposite the medium-efficiency filter 14, a large pressure gradient is avoided on the plane containing the medium-efficiency filter 14. This ensures that the negative pressure is basically the same throughout the medium-efficiency filter 14, thus utilizing the filtration capacity of the medium-efficiency filter 14 more evenly. This reduces the rate at which the filtration resistance increases with usage time, thereby extending the service life of the medium-efficiency filter 14.

[0076] Please refer to Figures 2 to 4 The projector 10 also includes a grille 16, which is disposed on the side of the medium- and high-efficiency filter 14 away from the limiting rib 135 and abuts against the medium- and high-efficiency filter 14.

[0077] The limiting ribs 135 and the grid 16 can clamp the medium-high efficiency filter screen 14 from both sides of the medium-high efficiency filter screen 14, thereby improving the stability of the installation of the medium-high efficiency filter screen 14. The grid 16 can be screwed, riveted and / or buckled with the second shell 13.

[0078] Please refer to Figure 5 In some embodiments, the second shell 13 further comprises a blocking part 137 arranged in the second accommodating cavity 131; the first shell 11 is provided with an exhaust port 114, and the blocking part 137 is used to block the part of the exhaust port 114 exposed in the second accommodating cavity 131.

[0079] Since the second shell 13 is completely independent of the first shell 11, the second shell 13 and the medium-high efficiency filter screen 14 can be designed as an accessory structure of the projector 10, and can be installed on the first shell 11 which has been designed and completed, as an upgrade kit of the projector 10. At this time, the exhaust port 114 on the first shell 11 can be partially opened towards the first end wall 112 of the first shell 11, and when the second shell 13 is installed on one side of the first end wall 112, the part of the exhaust port 114 towards the first end wall 112 can be exposed to the second accommodating cavity 131. The blocking part 137 blocks the part of the exhaust port 114 exposed to the second accommodating cavity 131, which can prevent the gas discharged from the exhaust port 114 from being sucked into the first accommodating cavity 111 again. It can be known that the gas discharged from the exhaust port 114 has been used for heat dissipation inside the projector 10, and the blocking part 137 prevents the high-temperature gas from entering the first accommodating cavity 111, thereby improving the heat dissipation capacity of the projector 10.

[0080] The blocking part 137 blocks the part of the exhaust port 114 exposed to the second accommodating cavity 131, but it does not mean that this part needs to be closed compared to the outside of the projector 10, but only needs to be closed compared to the second accommodating cavity 131, that is, this part can also have the ability to discharge gas to the outside.

[0081] Please refer to Figure 6 and Figure 7 In some embodiments, the fan 15 comprises a centrifugal fan 151 and an axial fan 152; the centrifugal fan 151 and the axial fan 152 are arranged in the first accommodating cavity 111; the centrifugal fan 151 is used to suck the gas from the second accommodating cavity 131 into the first accommodating cavity 111; and the axial fan 152 is used to push the gas in the first accommodating cavity 111 out of the first accommodating cavity 111.

[0082] The centrifugal fan 151 has high air extraction capacity, and is arranged in the upper air area in the first accommodating cavity 111 to ensure sufficient air flow into the first accommodating cavity 111. The axial fan 152 has a large air inlet area, and can easily absorb stray air flow in the first accommodating cavity 111 to ensure that the high-temperature air after heat exchange can be discharged from the projector 10, thereby improving the heat dissipation capacity of the projector 10.

[0083] Please refer to Figure 7 and Figure 10 In some embodiments, the projection assembly 12 includes a light source 121, a heat conduction member 122 and a heat dissipation fin 123 arranged in the first accommodating cavity 111. One end of the heat conduction member 122 is in heat conduction connection with the light source 121, and the other end is in heat conduction connection with the heat dissipation fin 123. The axial fan 152 is used to transport air to the heat dissipation fin 123, so that the air is discharged from the projector 10 after passing through the heat dissipation fin 123.

[0084] The heat conduction member 122 is a device with good heat conduction, for example, it can be a metal or an alloy with good heat conduction, etc., and can also be a heat pipe, or a combination of multiple heat conduction devices, for example Figure 10 In the embodiment shown, the heat conduction member 122 is a combination of a heated block and a heat pipe. The heated block uniformly transmits the heat of the light source 121 to the heat pipe, and the heat pipe transmits the heat to the heat dissipation fin 123 or directly dissipates to the air. At this time, the axial fan 152 can transport air to the heat dissipation fin 123, so that the heat dissipated by the heat dissipation fin 123 and the heat pipe to the air is discharged from the projector 10, thereby improving the heat dissipation capacity of the projector 10.

[0085] The heat conduction connection refers to direct or indirect connection. In one example, the light source 121 is in direct contact with the heat conduction member 122 for heat conduction connection. In another example, the light source 121 and the heat conduction member 122 are coated with heat-conducting silicone for heat conduction connection. The heat dissipation fin 123 and the heat conduction member 122 can also be in direct or indirect heat conduction connection.

[0086] Since the axial fan 152 is arranged in the lower air area in the first accommodating cavity 111, and the light source 121 is a device with a large heat generation in the projector 10, the air for heat dissipation of the light source 121 in the lower air area in the first accommodating cavity 111 and directly discharged from the first accommodating cavity 111 helps to protect other devices in the first accommodating cavity 111 from overheating.

[0087] There are at least two ways for the axial fan 152 to transport air to the heat dissipation fin 123. One is that the heat dissipation fin 123 is arranged on the air outlet side of the axial fan 152, and the axial fan 152 blows air to the heat dissipation fin 123 Figure 7 The embodiment shown adopts this scheme); the second is that the heat dissipation fin 123 is arranged on the air inlet side of the axial fan 152, and the axial fan 152 sucks air from the heat dissipation fin 123 (i.e. inFigure 7 In the illustrated embodiment, the heat dissipation fins 123 and the axial flow fan 152 are exchanged in position, forming a gas delivery path from the heat dissipation fins 123, the axial flow fan 152 to the exhaust port 114.

[0088] Please refer to Figure 8 and Figure 9 In some embodiments, the projector 10 further comprises a spatial light modulator 124 disposed in the first accommodating cavity 111.

[0089] The spatial light modulator 124 is plate-shaped and formed with a central air duct 1241 having opposite first and second ends 12411 and 12412.

[0090] The first housing 11 is formed with an arc-shaped air duct 115 which is in communication with the first end 12411 of the central air duct 1241 and extends along the surface normal of the spatial light modulator 124 from the first end 12411 in a direction away from the spatial light modulator 124; the centrifugal fan 151 is configured to deliver air to an end of the arc-shaped air duct 115 away from the first end 12411.

[0091] The first housing 11 is further formed with an air outlet cavity 116 which is in communication with the second end 12412 of the central air duct 1241 and extends along the surface normal of the spatial light modulator 124 from the second end 12412 in a direction away from the arc-shaped air duct 115; the axial flow fan 152 is disposed in the air outlet cavity 116 away from the central air duct 1241.

[0092] Please refer to Figure 9 It can be seen that the air ducts thus arranged are substantially in the form of a "Z" shape and substantially cover all the devices which need to be cooled, which helps to make the projector 10 compact and small in size.

[0093] Please refer to Figure 2 and Figure 9 The arc-shaped air duct 115, the central air duct 1241 and the air outlet cavity 116 can be enclosed compared to other parts in the first accommodating cavity 111, in one example, the first housing 11 and the air duct cover 17 enclose the arc-shaped air duct 115, the central air duct 1241 and the air outlet cavity 116 to form relatively enclosed air ducts in the first accommodating cavity 111; in another example, the arc-shaped air duct 115, the central air duct 1241 and the air outlet cavity 116 are open compared to other parts in the first accommodating cavity 111.

[0094] A power supply circuit board can also be disposed in the air outlet cavity 116 to cool the power supply circuit board.

[0095] Please refer to Figure 6 , Figure 7 and Figure 9In some embodiments, the spatial light modulator 124 comprises a Fresnel lens 1242, an LCD panel 1243 and a polarizing panel 1244 arranged in sequence and parallel to each other, and a central air duct 1241 is formed between the Fresnel lens 1242 and the LCD panel 1243 and between the LCD panel 1243 and the polarizing panel 1244.

[0096] The polarizing panel 1244 and the LCD panel 1243 both absorb part of the light of the light source 121, thereby generating heat, and the LCD panel 1243 can further comprise TFTs (thin film transistors) which also generate heat. The liquid crystal material in the LCD and the polarizing panel 1244 are both easily damaged at high temperatures, and therefore the central air duct 1241 formed between the Fresnel lens 1242 and the LCD panel 1243 and between the LCD panel 1243 and the polarizing panel 1244 can directly dissipate heat for the LCD panel 1243 and the polarizing panel 1244, thereby avoiding overheating of the LCD panel 1243 and the polarizing panel 1244 and prolonging the service life of the LCD panel 1243 and the polarizing panel 1244.

[0097] The above description is only exemplary embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields made by using the content of the present application specification and drawings is included in the patent protection scope of the present application.

Claims

1. A projector characterized by comprising: The projector comprises: a housing, in which a first accommodating cavity and a second accommodating cavity are formed in communication; a projection assembly arranged in the first accommodating cavity; a medium-high efficiency filter screen arranged in the second accommodating cavity; and a fan arranged in the first accommodating cavity and configured to suck air in the second accommodating cavity so that the air passing through the medium-high efficiency filter screen enters the first accommodating cavity from the second accommodating cavity.

2. The projector of claim 1, wherein, The housing comprises a first housing and a second housing, the first accommodating cavity is arranged in the first housing, and the second accommodating cavity is arranged in the second housing; the second housing is arranged outside the first housing; the first housing and the second housing are arranged separately or integrally.

3. The projector of claim 2, wherein, The first housing comprises a first end wall and a first side wall, the first side wall extends from the edge of the first end wall to one side of the first end wall; The second housing comprises a second side wall and a second end wall, the second side wall is arranged on the side of the first end wall away from the first side wall and extends from the edge of the first end wall to the direction away from the first side wall; The second end wall is arranged on the edge of the second side wall away from the first end wall and surrounds the second accommodating cavity together with the first end wall; the second end wall is provided with a mounting cavity recessed toward the first end wall and into the second accommodating cavity, and the medium-high efficiency filter screen is arranged in the mounting cavity.

4. The projector of claim 3, wherein, The medium-high efficiency filter screen is in a plate shape, and the area of the orthographic projection of the medium-high efficiency filter screen on a projection plane parallel to the medium-high efficiency filter screen is 90% or more of the area of the orthographic projection of the first end wall on the projection plane; and / or The medium-high efficiency filter screen is a HEPA filter screen.

5. The projector of claim 3, wherein, The second housing further comprises a mounting wall and a limiting rib, the mounting wall extends from the second end wall to the first end wall and surrounds the mounting cavity; the limiting rib extends from the edge of the first end wall into the mounting cavity and abuts against the side of the medium-high efficiency filter screen facing the first end wall; the limiting rib is arranged at least partially spaced from the first end wall to form an air suction cavity between the limiting rib and the first end wall.

6. The projector of claim 5, wherein, An air inlet is formed in the first end wall and communicates with the second accommodating cavity; the medium-high efficiency filter screen is in a plate shape, and the projection of the air inlet on the projection plane is outside the projection of the air suction cavity on the projection plane; and / or The projector further comprises a grille arranged on the side of the medium-high efficiency filter screen away from the limiting rib and abutting against the medium-high efficiency filter screen.

7. The projector of claim 2, wherein, The second housing further comprises a blocking part arranged in the second accommodating cavity; the first housing is provided with an air outlet, and the blocking part is configured to block the part of the air outlet exposed in the second accommodating cavity.

8. The projector of claim 2, wherein, The fan comprises a centrifugal fan and an axial flow fan; the centrifugal fan and the axial flow fan are arranged in the first accommodating cavity; the centrifugal fan is configured to suck air from the second accommodating cavity into the first accommodating cavity; and the axial flow fan is configured to push the air in the first accommodating cavity out of the first accommodating cavity.

9. The projector of claim 8, wherein, The projection component comprises a light source, a heat conducting member and a heat dissipation fin arranged in the first accommodating cavity; one end of the heat conducting member is in heat conducting connection with the light source, and the other end is in heat conducting connection with the heat dissipation fin; the axial flow fan is used for conveying gas to the heat dissipation fin, so that the gas is discharged from the projector after passing through the heat dissipation fin; and / or The projector further comprises a spatial light modulator arranged in the first accommodating cavity; the spatial light modulator is in the form of a plate and is formed with a central air duct having opposite first and second ends; the first shell is formed with an arc-shaped air duct which is in communication with the first end of the central air duct and extends away from the spatial light modulator along the surface normal of the spatial light modulator from the first end to a direction away from the spatial light modulator; the centrifugal fan is used for blowing air to one end of the arc-shaped air duct away from the first end; the first shell is further formed with an air outlet cavity which is in communication with the second end of the central air duct and extends away from the arc-shaped air duct along the surface normal of the spatial light modulator from the second end to a direction away from the arc-shaped air duct; and the axial flow fan is arranged in the air outlet cavity away from the central air duct.

10. The projector of claim 9, wherein, The spatial light modulator of the projector comprises a Fresnel lens, an LCD panel and a polarization panel which are spaced apart from each other, parallel to each other and arranged in sequence; and the central air duct is formed between the Fresnel lens and the LCD panel and between the LCD panel and the polarization panel.

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