Projection device and projection system

Abstract

The invention provides a projection device and a projection system. The projection device comprises a shell; the light path unit is arranged on the shell, the light path unit comprises a light source, a light valve and a lens, and a light beam generated by the light source is modulated by the light valve and then is emitted by the lens; the heat dissipation unit is arranged on the shell, the heat dissipation unit comprises a blocking piece and a heat dissipation piece, the blocking piece is arranged between the light valve and the lens to shield part of light, the heat dissipation piece comprises a connecting part and a heat dissipation part, the connecting part is provided with a first abutting face, the blocking piece is provided with a second abutting face, and the first abutting face and the second abutting face are attached to each other; and the heat dissipation part faces an air outlet of a heat dissipation fan in the projection device. According to the invention, the safety coefficient after the metal is plasticized is effectively ensured.

Description

Technical Field

[0001] The present invention relates to the field of projection technology, and in particular to a projection device and a projection system. Background Art

[0002] As society continues to develop, people's pursuits are also constantly changing. Projection display systems are increasingly used in people's work and life. Competition in the laser projection market is becoming increasingly fierce, and higher requirements are being placed on the user experience of products. With the demand for miniaturization and low-cost strategic routes for laser TV products, the optical engine, as a key component of the laser TV engine, will also be designed towards miniaturization and low cost.

[0003] Currently, the OFF light of the lens will be projected onto the baffle, which blocks part of the OFF light. Under the requirement of low cost, the entire optical engine shell is converted from aluminum-magnesium alloy to plastic.

[0004] However, due to the low thermal conductivity of plastic in existing solutions, the internal temperature of the housing will increase sharply due to exposure to stray light and OFF light. This will cause the temperature of some parts such as the digital micromirror device (DMD) and the galvanometer to rise, posing a significant risk to product reliability. Summary of the Invention

[0005] The main purpose of the present invention is to provide a projection device and a projection system, which effectively ensure the safety factor of metal after plasticization.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a projection device, comprising:

[0007] case;

[0008] The optical path unit is arranged on the housing and includes a light source, a light valve and a lens. The light beam generated by the light source is modulated by the light valve and then emitted by the lens;

[0009] The heat dissipation unit is arranged on the shell, and the heat dissipation unit includes a baffle and a heat dissipation member. The baffle is arranged between the light valve and the lens to block part of the light. The heat dissipation member includes a connecting portion and a heat dissipation portion. The connecting portion has a first abutting surface, and the baffle has a second abutting surface. The first abutting surface and the second abutting surface are in contact with each other, and the heat dissipation portion faces the air outlet of the heat dissipation fan in the projection device.

[0010] The beneficial effects of the present invention are as follows: by providing a heat dissipation unit and using a plastic material for the shell, heat generated by OFF light can be transferred from the inside of the shell to the outside under dark conditions. Specifically, when the OFF light baffle is exposed to light, the temperature of the OFF light baffle rises sharply, which can reduce the stability of the surrounding plastic shell or even cause it to fail. The heat dissipation element and the baffle are arranged in close contact with each other to transfer the heat on the OFF light baffle to the heat dissipation element, and the heat dissipation fan dissipates heat from the heat dissipation element. Under bright conditions, the heat inside the shell can be absorbed. Since, under bright conditions, the temperature of the shell is higher than that of the OFF light baffle, the OFF light baffle absorbs the heat inside the shell under bright conditions, and dissipates the heat again through the heat dissipation element and the heat dissipation fan, thereby transferring the heat inside the shell to the outside. In addition, the connection portion of the heat dissipation element can be in close contact with the OFF light baffle to achieve zero gap, effectively ensuring the safety factor of the metal after plasticization.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] In some optional embodiments, one end of the baffle is connected to the side wall of the housing, and the other end of the baffle abuts against the heat sink, and the connecting portion protrudes toward the baffle so that the first abutting surface abuts against the second abutting surface.

[0013] Along the length direction of the connecting portion, the length of the connecting portion is smaller than the length of the heat dissipation portion.

[0014] In some optional embodiments, the baffle and the heat sink are an integrally formed structure; or,

[0015] The baffle is connected to the heat sink.

[0016] In some optional embodiments, the heat dissipation portion is a plate-shaped structure, comprising a heat dissipation plate and a plurality of heat dissipation fins, wherein the plurality of heat dissipation fins are arranged on the heat dissipation plate at intervals, a heat dissipation channel is formed between adjacent heat dissipation fins, and the heat dissipation fins and the connecting portion are respectively located on opposite sides of the heat dissipation plate;

[0017] The length direction of the connecting portion matches the length direction of the heat dissipation plate.

[0018] In some optional embodiments, the plurality of heat dissipating fins are spaced apart along the length direction of the heat dissipating plate and extend along the width direction of the heat dissipating plate.

[0019] In some optional embodiments, the plurality of heat dissipating fins are spaced apart along the width direction of the heat dissipating plate and extend along the length direction of the heat dissipating plate.

[0020] In some optional embodiments, the heat dissipation unit further includes a heat conducting member, and the heat conducting member is a sheet-like structure;

[0021] The first end surface of the heat conducting member is in contact with the first abutting surface, and the second end surface of the heat conducting member is in contact with the second abutting surface.

[0022] In some optional embodiments, a connecting piece is further included, a first connecting hole is provided on the heat sink, a second connecting hole is provided on the shell, and the connecting piece passes through the first connecting hole and the second connecting hole in sequence to connect the heat sink and the shell.

[0023] In a second aspect, the present invention further provides a projection device, comprising:

[0024] case;

[0025] lens;

[0026] The heat dissipation unit is arranged on the shell and includes a baffle and a heat dissipation element. The baffle is arranged above the side of the lens, and the heat dissipation element abuts against the baffle to dissipate heat from the baffle.

[0027] In a third aspect, the present invention further provides a projection system, comprising a projection screen and the above-mentioned projection device, wherein the projection device is used to project a projection image onto the projection screen.

[0028] The present invention provides a projection device and a projection system, wherein the projection system includes a projection screen and a projection device, wherein the projection device is used to project a projection image onto the projection screen; wherein the projection device includes: a housing; an optical path unit, wherein the optical path unit is arranged on the housing, and includes a light source, a light valve, and a lens, wherein a light beam generated by the light source is modulated by the light valve and then emitted by the lens; a heat dissipation unit, wherein the heat dissipation unit is arranged on the housing, and includes a baffle and a heat dissipation element, wherein the baffle is arranged between the light valve and the lens to block part of the light, and the heat dissipation element includes a connecting portion and a heat dissipation portion, wherein the connecting portion has a first abutting surface, and the baffle has a second abutting surface, wherein the first abutting surface and the second abutting surface are in contact with each other, and the heat dissipation portion faces the air outlet of a heat dissipation fan in the projection device.

[0029] Through the provision of a heat dissipation unit, the shell is made of plastic material, and can transfer the heat generated by the OFF light from the inside of the shell to the outside under dark conditions. Specifically, when the OFF light baffle is exposed to light, the temperature of the OFF light baffle will rise sharply, causing the stability of the surrounding plastic shell to decrease or even fail. The heat sink and the baffle are fitted together to transfer the heat on the OFF light baffle to the heat sink, and the heat dissipation fan dissipates the heat from the heat sink; under bright conditions, the heat inside the shell can be absorbed. Since, under bright conditions, the temperature of the shell is higher than the temperature of the OFF light baffle, the OFF light baffle absorbs the heat inside the shell under bright conditions, and dissipates the heat again through the heat sink and the heat dissipation fan in sequence, thereby transferring the heat inside the shell to the outside. In addition, the connection part of the heat sink can be in close contact with the OFF light baffle to achieve zero gap, effectively ensuring the safety factor of the metal after plasticization. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 A schematic structural diagram of a projection device at a first viewing angle provided by an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of a second viewing angle of a projection device provided in an embodiment of the present application;

[0033] Figure 3 A schematic diagram of the structure of a projection device from a third viewing angle provided in an embodiment of the present application;

[0034] Figure 4 A schematic structural diagram of a heat sink in a projection device provided in an embodiment of the present application from a first viewing angle;

[0035] Figure 5 A schematic structural diagram of a heat sink in a projection device according to an embodiment of the present application from a second viewing angle;

[0036] Figure 6 A schematic structural diagram of a heat sink in a projection device provided in an embodiment of the present application from a third perspective;

[0037] Figure 7 A schematic structural diagram of another heat dissipation element in a projection device provided in an embodiment of the present application;

[0038] Figure 8 A schematic structural diagram of another projection device provided in an embodiment of the present application;

[0039] Figure 9 An exploded view of another projection device provided in an embodiment of the present application;

[0040] Figure 10 A schematic structural diagram of a heat dissipation unit from a first viewing angle in another projection device provided in an embodiment of the present application;

[0041] Figure 11 A schematic structural diagram of a heat dissipation unit at a second viewing angle in another projection device provided in an embodiment of the present application;

[0042] Figure 12 A schematic structural diagram of another projection device provided in an embodiment of the present application;

[0043] Figure 13 An exploded view of a first perspective of another projection device provided in an embodiment of the present application;

[0044] Figure 14 This is an exploded view of a second viewing angle of another projection device provided in an embodiment of the present application.

[0045] Description of reference numerals:

[0046] 100-projection device;

[0047] 110-housing;

[0048] 120- cooling unit;

[0049] 121-blocking piece;

[0050] 122-heat sink;

[0051] 1221-connection part;

[0052] 1222-heat dissipation unit;

[0053] 12221-heat sink;

[0054] 12222-heat sink fins;

[0055] 123-heat conducting element;

[0056] 130-groove. DETAILED DESCRIPTION

[0057] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention. All other embodiments obtained are within the scope of protection of the present invention. The following embodiments and features in the embodiments may be combined with each other unless there is a conflict.

[0058] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0060] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0061] Currently, the OFF light from the lens is projected onto the baffle, which partially blocks this OFF light. To maintain low costs, the entire optical engine housing has been converted from aluminum-magnesium alloy to plastic. However, due to the low thermal conductivity of plastic, the existing solution is less effective at blocking stray light and OFF light. This can cause the internal housing temperature to rise sharply, causing the temperature of parts such as the digital micromirror device (DMD) and the galvanometer to rise, posing a significant risk to product reliability.

[0062] To overcome the shortcomings of the prior art, the projection device and projection system provided by the present invention utilize a heat dissipation unit and a plastic housing. These heat dissipation units can transfer heat generated by OFF light from the interior of the housing to the exterior in dark conditions. Specifically, when the OFF light baffle is exposed to light, its temperature rises dramatically, reducing the stability of the surrounding plastic housing or even causing it to fail. A heat sink is fitted to the baffle to transfer heat from the OFF light baffle to the heat sink, which is then dissipated by a heat dissipation fan. Furthermore, the heat inside the housing can be absorbed in bright conditions. Because the housing temperature is higher than that of the OFF light baffle in bright conditions, the OFF light baffle absorbs heat from the housing in bright conditions. This heat is then dissipated again through the heat sink and the heat dissipation fan, transferring the heat inside the housing to the exterior. Furthermore, the connection portion of the heat sink can be in close contact with the OFF light baffle, achieving zero gap, effectively ensuring the safety factor of the plasticized metal.

[0063] The content of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the content of the present invention more clearly and in detail.

[0064] Figure 1 This is a schematic structural diagram of a first viewing angle of a projection device provided in an embodiment of the present application. Figure 2 This is a schematic structural diagram of a second viewing angle of a projection device provided in an embodiment of the present application. Figure 3 This is a schematic structural diagram of a projection device according to a third viewing angle provided in an embodiment of the present application. Figure 4 This is a schematic structural diagram of a heat sink in a projection device provided by an embodiment of the present application from a first perspective. Figure 5 This is a schematic structural diagram of a heat sink in a projection device according to an embodiment of the present application from a second viewing angle. Figure 6 This is a schematic structural diagram of a heat sink in a projection device provided in an embodiment of the present application from a third perspective. Figure 7 This is a schematic structural diagram of another heat sink in the projection device provided in an embodiment of the present application.

[0065] like Figures 1 to 7 As shown, an embodiment of the present application provides a projection device 100, comprising:

[0066] Housing 110;

[0067] The optical path unit is provided on the housing 110 and includes a light source, a light valve, and a lens. The light beam generated by the light source is modulated by the light valve and then emitted by the lens;

[0068] The heat dissipation unit 120 is arranged on the housing 110. The heat dissipation unit 120 includes a baffle 121 and a heat dissipation member 122. The baffle 121 is arranged between the light valve and the lens to block part of the light. The heat dissipation member 122 includes a connecting portion 1221 and a heat dissipation portion 1222. The connecting portion 1221 has a first abutting surface, and the baffle 121 has a second abutting surface. The first abutting surface and the second abutting surface are in contact with each other. The heat dissipation portion 1222 faces the air outlet of the heat dissipation fan in the projection device and extends along the direction of the air outlet of the heat dissipation fan.

[0069] Through the above arrangement, that is, through the arrangement of the heat dissipation unit 120, the housing 110 is made of plastic material, and in a dark field, the heat generated by the OFF light can be transferred from the inside of the housing 110 to the outside. Specifically, when the OFF light baffle 121 is exposed to light, the temperature of the OFF light baffle 121 will rise sharply, which will cause the stability of the surrounding plastic housing 110 to be reduced or even fail. The heat dissipation member 122 is arranged in a close relationship with the baffle 121 to transfer the heat on the OFF light baffle 121 to the heat dissipation member 122, and the heat dissipation fan dissipates the heat of the heat dissipation member 122. In the white field, the heat inside the housing 110 can be absorbed. Since, in the white field, the temperature of the housing 110 is higher than the temperature of the OFF light baffle 121, the OFF light baffle 121 absorbs the heat inside the housing 110 in the white field, and then dissipates the heat in sequence through the heat sink 122 and the heat dissipation fan, thereby transferring the heat inside the housing 110 to the outside. In addition, the connecting portion 1221 of the heat sink 122 can be in close contact with the OFF light baffle 121 to achieve zero gap, effectively ensuring the safety factor after the metal is plasticized.

[0070] It should be noted that each structure is described in detail below.

[0071] It should be noted that the housing 110 is used to install the optical path unit, and the accommodating space of the housing 110 is slightly larger than the external dimensions of the optical path unit.

[0072] In some examples, the housing 110 may be a metal member, and its material may include one or more of copper, iron, aluminum, tin, and lead.

[0073] In other examples, the housing 110 may be made of plastic.

[0074] It should be noted that the specific material of the housing 110 is not excessively limited in the embodiment of the present application.

[0075] Of course, during manufacturing, the housing 110 can also be made of steel plates, plastics or synthetic materials while ensuring strength.

[0076] In some embodiments, the housing 110 is made of a plastic material. During injection molding, molten plastic is injected into a plastic product mold under pressure and cooled to form the desired plastic part. The injection molding process can be performed using a mechanical injection molding machine. The material of the housing 110 can include one or more of polyethylene, polypropylene, ABS (a terpolymer of acrylonitrile (A), butadiene (B), and styrene (S)), polyamide, and polystyrene.

[0077] It should be noted that the optical path unit can project an image beam, and the image beam can project an image picture on the projection screen for users to watch.

[0078] A lens is a flexible, transparent material with two surfaces exhibiting different curvatures, allowing it to redirect or focus light as needed. Lenses are used in optical instruments, eyeglasses, and camera lenses, among other applications. Lenses are a common type of lens, capable of focusing or dispersing light depending on their curvature.

[0079] Convex and concave lenses are commonly used in projection. Convex lenses focus parallel light rays onto a single point, called the focal point. Concave lenses disperse parallel light rays. By using the appropriate lens type and curvature, the light in the projector can be adjusted to ensure a clear and visible projected image.

[0080] It should be noted that Digital Light Processing (DLP) projection displays offer high brightness, high contrast, and high resolution. Combined with new LED light sources, they enable miniaturized, portable micro-projectors, meeting people's demand for portable projection displays. When a DLP digital projector projects a black field, light from the illumination system hits the baffle 121 of the projector housing 110. This light is referred to as OFF light.

[0081] The baffle 121 in this application may be an OFF light baffle 121. The OFF light baffle 121 is an optical element used to adjust the light source of the projection device 100. The projection device 100 typically uses a high-brightness light source to produce an image, but in some cases, it is necessary to adjust the intensity of the light source or block some light to achieve a better projection effect or adapt to a specific environment.

[0082] The OFF light barrier 121 can adjust the brightness and contrast of the projected image by controlling the output of the light source, or completely turn off the light source when needed. This adjustment can achieve the best projection effect in different scenarios, such as adjusting the brightness in a dark environment or reducing glare in a bright environment.

[0083] It should be noted that the housing 110 in the embodiments of the present application is described using a plastic material as an example. In existing technical solutions, the engine housing 110 is mostly made of an aluminum-magnesium alloy solution. Aluminum-magnesium alloy has good thermal conductivity. The OFF light baffle 121 shell is directly locked to the metal housing 110. When the OFF light baffle 121 is exposed to light, the heat generated can be directly transferred to the metal housing 110, and the metal housing 110 directly transfers the heat to the surrounding environment. However, for the plastic housing 110, when the OFF light baffle 121 is exposed to light, the temperature of the OFF light baffle 121 will rise sharply to 160°C or even above 200°C, causing the surrounding plastic housing 110 to become unstable or even fail. Due to thermal radiation, the temperature of components around the OFF light baffle 121 (such as the DMD and galvanometer) will also rise, exceeding the specified temperature. Therefore, after switching to the plastic housing 110, the heat generated by the OFF light needs to be processed and diffused to the outside of the housing 110.

[0084] Therefore, by fitting the heat sink 122 to the baffle 121, the heat on the baffle 121 is transferred to the heat sink 122, and the heat dissipation fan dissipates heat from the heat sink 122. Alternatively, the heat sink 122 can achieve a better heat dissipation effect on the baffle 121 by increasing the heat dissipation area of ​​the baffle 121.

[0085] Specifically, the heat sink 122 includes a connecting portion 1221 and a heat dissipation portion 1222, wherein the connecting portion 1221 is used to contact the baffle 121 to transfer the heat on the baffle 121 to the connecting portion 1221, and then to the heat dissipation portion 1222. The heat dissipation portion 1222 extends toward the air outlet of the heat dissipation fan, so that the cold air blown out from the air outlet of the heat dissipation fan blows toward the heat dissipation portion 1222 to cool it down.

[0086] The first abutting surface of the connecting portion 1221 and the second abutting surface of the blocking piece 121 are tightly fitted to each other, and their shapes and sizes can match each other, so as to better transfer the heat on the blocking piece 121 to the connecting portion 1221 .

[0087] It should be noted that the heat sink 122 may be made of copper, aluminum or copper alloy, which is not limited here.

[0088] In some optional embodiments, one end of the baffle 121 is connected to the side wall of the housing 110, and the other end of the baffle 121 abuts against the heat sink 122. The connecting portion 1221 protrudes toward the baffle 121 so that the first abutting surface abuts against the second abutting surface.

[0089] Along the length direction of the connecting portion 1221 , the length of the connecting portion 1221 is smaller than the length of the heat dissipation portion 1222 .

[0090] It should be noted that one end of the baffle 121 is set on the shell 110, and the other end is in contact with the connecting portion 1221 of the heat sink 122. In order to make the baffle 121 and the heat sink 122 in close contact, the connecting portion 1221 extends in the direction facing the baffle 121, and the heat sink 1222 extends along the direction of the air outlet of the heat sink fan to dissipate heat.

[0091] In addition, it should be noted that if Figure 4 As shown, A represents the length direction of the connecting portion 1221. Along the direction A, the length of the connecting portion 1221 is less than the length of the heat dissipation portion 1222. Such a setting satisfies the abutment between the first abutting surface of the connecting portion 1221 and the second abutting surface of the baffle 121, while taking into account the narrow space inside the shell 110, the connecting portion 1221 extends toward the side away from the heat dissipation portion 1222.

[0092] In some embodiments, the connecting portion 1221 may be a protrusion, the first abutting surface thereof may be a planar structure, and the second abutting surface thereof may also be a planar structure, and the connecting portion 1221 may be in contact with each other without any gap.

[0093] Figure 8 This is a schematic structural diagram of another projection device provided in an embodiment of the present application. Figure 9 This is an exploded view of another projection device provided in an embodiment of the present application. Figure 10 This is a schematic structural diagram of a first viewing angle of a heat dissipation unit in another projection device provided in an embodiment of the present application. Figure 11 This is a structural schematic diagram of a second viewing angle of a heat dissipation unit in another projection device provided in an embodiment of the present application.

[0094] like Figures 8 to 11 As shown, in some optional embodiments, the blocking piece 121 and the heat sink 122 are an integrally formed structure.

[0095] Specifically, the baffle 121 and the heat sink 122 are integrally formed, which can ensure that the baffle 121 and the heat sink 122 are integrally formed and manufactured and are inseparable from each other. On the one hand, the number of parts used can be reduced, the assembly difficulty and assembly accuracy requirements can be reduced, the welding connection process of the baffle 121 and the heat sink 122 is omitted, and the assembly efficiency is improved; on the other hand, the overall stiffness of the heat dissipation unit 120 can be improved, the possibility of loosening between the baffle 121 and the heat sink 122 can be reduced, and the structural strength is higher.

[0096] It should be noted that by setting the baffle 121 and the heat sink 122 to be integrally formed, not only can the connection strength between the baffle 121 and the heat sink 122 be improved, but also a seamless connection between the baffle 121 and the heat sink 122 can be achieved, thereby reducing the risk of cracking at the connection position between the baffle 121 and the heat sink 122.

[0097] In some embodiments, during injection molding of the baffle 121 and heat sink 122, molten plastic is injected into a plastic product mold using pressure, and then cooled and formed into the desired plastic part. The injection molding process can be performed using a mechanical injection molding machine. The materials of the baffle 121 and heat sink 122 can include one or more of polyethylene, polypropylene, ABS (a terpolymer of acrylonitrile (A), butadiene (B), and styrene (S)), polyamide, and polystyrene.

[0098] In some optional embodiments, the baffle and the heat sink are two independent structural components that are interconnected.

[0099] Specifically, the baffle and the heat sink can be connected in a detachable manner, such as a threaded connection or a snap connection. The embodiment of the present application can be adjusted according to actual conditions and is not subject to excessive restrictions here.

[0100] like Figures 1 to 11 As shown, in some optional embodiments, the heat dissipation portion 1222 is a plate-shaped structure, and the heat dissipation portion 1222 includes a heat dissipation plate 12221 and a plurality of heat dissipation fins 12222. The plurality of heat dissipation fins 12222 are spaced apart on the heat dissipation plate 12221, and a heat dissipation channel is formed between adjacent heat dissipation fins 12222. The heat dissipation fins 12222 and the connecting portion 1221 are respectively located on opposite sides of the heat dissipation plate 12221.

[0101] The length direction of the connecting portion 1221 matches the length direction of the heat dissipation plate 12221 .

[0102] It should be noted that the heat dissipation fins 12222 extend in a direction facing the heat dissipation fan to increase the heat dissipation area while allowing the cold air blown out by the heat dissipation fan to be better blown toward the heat dissipation fins 12222.

[0103] The arrangement of the plurality of heat dissipation fins 12222 further increases the heat dissipation area of ​​the heat dissipation portion 1222 , thereby ultimately achieving a good heat dissipation effect.

[0104] In addition, it should be noted that the length direction of the connecting portion 1221 is consistent with the length direction of the heat dissipation plate 12221 .

[0105] It should be noted that, in some embodiments, the heat sink 12221 and the heat sink fins 12222 are connected in an integrated manner, and in other embodiments, the heat sink 12221 and the heat sink fins 12222 may also be connected in other manners. As long as the connection method can fix the heat sink 12221 and the heat sink fins 12222, it can achieve the purpose of this embodiment. Here, there is no restriction on the connection method between the heat sink 12221 and the heat sink fins 12222.

[0106] like Figures 1 to 11 As shown, in some optional embodiments, a groove 130 with an opening is formed between two adjacent heat dissipation fins 12222 and the heat dissipation plate 12221, and a heat dissipation channel is formed in the groove 130, and the heat dissipation channel is connected to the air outlet of the heat dissipation fan.

[0107] It should be noted that the cold air blown out from the air outlet of the heat dissipation fan flows into the heat dissipation channel, and then dissipates heat to the heat dissipation fins 12222 and the heat dissipation plate 12221.

[0108] Specifically, the heat on the baffle 121 is transferred to the heat dissipation plate 12221 of the heat dissipation element 122 through the connecting part 1221 of the heat dissipation element 122, and then transferred to the heat dissipation fins 12222 again. The heat dissipation fins 12222 increase the heat dissipation area, and the heat dissipation channel between the heat dissipation fins 12222 and the heat dissipation plate 12221 facilitates the cold air blown out from the air outlet of the heat dissipation fan to blow into the heat dissipation channel, and the cold air is in more complete contact with the heat dissipation fins 12222 and the heat dissipation plate 12221 to improve the heat dissipation effect of the baffle 121.

[0109] like Figures 4 to 6 As shown, in some optional embodiments, a plurality of heat dissipating fins 12222 are arranged at intervals along the length direction of the heat dissipating plate 12221 and extend along the width direction of the heat dissipating plate 12221 .

[0110] In some optional embodiments, such as Figure 7 As shown, a plurality of heat dissipation fins 12222 are arranged at intervals along the width direction of the heat dissipation plate 12221 and extend along the length direction of the heat dissipation plate 12221 .

[0111] It should be noted that such a setting, on the one hand, matches the internal space structure of the shell 110, making the entire structure more compact; on the other hand, the extension direction of the heat dissipating fins 12222 matches the position of the air outlet of the heat dissipating fan, that is, according to the flow direction of the air duct in the shell 110, the heat dissipating fins 12222 are designed with different directions, shapes and inclination angles.

[0112] In some embodiments, the heat dissipating fins 12222 and the heat dissipating plate 12221 are perpendicular to each other. Of course, the heat dissipating fins 12222 can be tilted relative to the heat dissipating plate 12221. Specifically, it can be adjusted according to actual conditions.

[0113] Figure 12 This is a structural diagram of another projection device provided in an embodiment of the present application. Figure 13 This is an exploded view of a first perspective of another projection device provided in an embodiment of the present application. Figure 14 This is an exploded view of a second viewing angle of another projection device provided in an embodiment of the present application.

[0114] like Figures 1 to 14 As shown, in some optional embodiments, the heat dissipation unit 120 further includes a heat conducting member 123, and the heat conducting member 123 is a sheet-like structure;

[0115] The first end surface of the heat conducting member 123 is in contact with the first abutting surface, and the second end surface of the heat conducting member 123 is in contact with the second abutting surface.

[0116] It should be noted that, in consideration of the work tolerance problem after actual processing, in order to ensure close contact between the heat sink 122 and the baffle 121, a heat conductor 123 is added between the heat sink 122 and the baffle 121. The setting of the heat conductor 123, on the one hand, fills the gap between the heat sink 122 and the baffle 121 to ensure that the baffle 121 and the heat sink 122 can fully contact and conduct heat; on the other hand, it can better conduct the heat on the baffle 121 to the connecting portion 1221 of the heat sink 122.

[0117] That is to say, the heat conducting member 123 is squeezed between the heat dissipating member 122 and the blocking piece 121 .

[0118] In some embodiments, the heat conductor 123 can be made of metal material, for example, the heat conductor 123 can be a copper sheet, which facilitates better heat conduction; of course, the heat conductor 123 can be a thermal paste made of some heat-absorbing material, which is attached between the heat sink 122 and the baffle 121.

[0119] In some embodiments, the heat conducting member 123 is a thin sheet structure, the first end surface of the heat conducting member 123 matches and fits the first abutting surface, and the second end surface of the heat conducting member 123 matches and fits the second abutting surface.

[0120] In some optional embodiments, a connecting piece is further included, a first connecting hole is opened on the heat sink 122, and a second connecting hole is opened on the shell 110, and the connecting piece passes through the first connecting hole and the second connecting hole in sequence to connect the heat sink 122 and the shell 110.

[0121] It should be noted that in the embodiment of the present application, considering the cost of the connecting member, the connecting member can be a threaded fastener. Correspondingly, a first connecting hole is opened on the heat sink 122, and the first connecting hole can be a threaded hole. The connecting member can pass through the first connecting hole and can be tightened or loosened to adjust the fixed and disassembled states.

[0122] In addition, correspondingly, a second connecting hole is opened on the shell 110, and the second connecting hole can also be a threaded hole. The connecting member can pass through the second connecting hole and can be adjusted to the fixed and disassembled state by tightening or loosening.

[0123] Specifically, the connecting member passes through the first connecting hole and the second connecting hole in sequence and is tightened, thereby fixing the heat sink 122 to the shell 110. Of course, when the heat sink 122 needs to be removed, it is only necessary to loosen the connecting member and then remove the connecting member from the second connecting hole and the first connecting hole in sequence.

[0124] The projection device provided in the embodiment of the present application includes: a shell; an optical path unit, which is arranged on the shell and includes a light source, a light valve and a lens, and the light beam generated by the light source is modulated by the light valve and then emitted by the lens; a heat dissipation unit, which is arranged on the shell and includes a baffle and a heat dissipation member, the baffle is arranged between the light valve and the lens to block part of the light, and the heat dissipation member includes a connecting portion and a heat dissipation portion, the connecting portion has a first abutting surface, the baffle has a second abutting surface, the first abutting surface and the second abutting surface are in contact with each other, and the heat dissipation portion faces the air outlet of the heat dissipation fan in the projection device.

[0125] Through the provision of a heat dissipation unit, the shell is made of plastic material, and can transfer the heat generated by the OFF light from the inside of the shell to the outside under dark conditions. Specifically, when the OFF light baffle is exposed to light, the temperature of the OFF light baffle will rise sharply, causing the stability of the surrounding plastic shell to decrease or even fail. The heat sink and the baffle are fitted together to transfer the heat on the OFF light baffle to the heat sink, and the heat dissipation fan dissipates the heat from the heat sink; under bright conditions, the heat inside the shell can be absorbed. Since, under bright conditions, the temperature of the shell is higher than the temperature of the OFF light baffle, the OFF light baffle absorbs the heat inside the shell under bright conditions, and dissipates the heat again through the heat sink and the heat dissipation fan in sequence, thereby transferring the heat inside the shell to the outside. In addition, the connection part of the heat sink can be in close contact with the OFF light baffle to achieve zero gap, effectively ensuring the safety factor of the metal after plasticization.

[0126] In addition, if Figures 1 to 14 As shown, the embodiment of the present application further provides a projection device 100, comprising:

[0127] Housing 110;

[0128] lens;

[0129] The heat dissipation unit 120 is disposed on the housing 110 and includes a baffle 121 and a heat sink 122 . The baffle 121 is disposed above the side of the lens. The heat sink 122 abuts against the baffle 121 to dissipate heat from the baffle 121 .

[0130] The projection device provided in the embodiment of the present application utilizes a heat dissipation unit and a plastic shell. This allows heat generated by OFF light to be transferred from the interior of the shell to the exterior in dark conditions. Specifically, when the OFF light baffle is exposed to light, the temperature of the OFF light baffle rises sharply, causing the surrounding plastic shell to become unstable or even fail. A heat sink is fitted with the baffle to transfer heat from the OFF light baffle to the heat sink, which is then dissipated by a heat dissipation fan. Furthermore, the projection device can absorb heat from the interior of the shell in bright conditions. Because the temperature of the shell is higher than that of the OFF light baffle in bright conditions, the OFF light baffle absorbs heat from the interior of the shell in bright conditions. This heat is then dissipated again in sequence through the heat sink and the heat dissipation fan, thereby transferring the heat from the interior of the shell to the exterior. Furthermore, the connection portion of the heat sink can be in close contact with the OFF light baffle, achieving zero gap, effectively ensuring the safety factor of the metal after plasticization.

[0131] In addition, an embodiment of the present application further provides a projection system, comprising a projection screen and the above-mentioned projection device, wherein the projection device is used to project a projection image onto the projection screen.

[0132] The projection system provided in this embodiment specifically includes a projection device and the projection device 100 in the aforementioned embodiment. The projection device 100 is used to project a projection image onto a display film of a projection screen.

[0133] The specific structure, working principle and function of the projection device 100 have been described in detail in the aforementioned embodiment 1 and will not be repeated here.

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

[0135] The projection screen comprises a display film, and the front side of the display film is a projection light receiving surface.

[0136] It should be noted that a projection screen comprises a diaphragm body and a connecting fabric. The diaphragm body is typically constructed of a hard material, including multiple optical structural layers. Compared to soft screens, it possesses a certain degree of hardness, brittleness, and rigidity. Therefore, when the diaphragm body is stretched, it forms a relatively flat surface. In this way, at least a portion of the front surface of the diaphragm body can be used as a light-receiving area for projecting images, allowing images to be projected onto the front surface of the diaphragm body for display.

[0137] Since the hard material constituting the diaphragm body is usually hard and brittle, if holes or grooves are directly punched on the hard diaphragm body for fixing, the diaphragm body may easily crack.

[0138] In order to connect and fix the hard diaphragm body, the display diaphragm in this embodiment further includes a soft connecting cloth. The connecting cloth can be adhered to the hard diaphragm body and connected to other fixing structures, thereby completing the fixation of the diaphragm body.

[0139] At this time, the connecting cloth and the diaphragm body are bonded to each other, so the stretching degree of the connecting cloth will also affect the curling or unfolding of the diaphragm body.

[0140] In some examples, to achieve connection with the diaphragm body, the connecting fabric is large enough to cover at least the area on the back of the diaphragm body opposite the front light-receiving area. In this case, the back of the light-receiving area is bonded to the connecting fabric. Thus, when the connecting fabric is flat and stretched, the light-receiving area on the diaphragm body used for projecting the image is also stretched, thereby achieving better image quality.

[0141] Through the provision of a heat dissipation unit, the shell is made of plastic material, and can transfer the heat generated by the OFF light from the inside of the shell to the outside under dark conditions. Specifically, when the OFF light baffle is exposed to light, the temperature of the OFF light baffle will rise sharply, causing the stability of the surrounding plastic shell to decrease or even fail. The heat sink and the baffle are fitted together to transfer the heat on the OFF light baffle to the heat sink, and the heat dissipation fan dissipates the heat from the heat sink; under bright conditions, the heat inside the shell can be absorbed. Since, under bright conditions, the temperature of the shell is higher than the temperature of the OFF light baffle, the OFF light baffle absorbs the heat inside the shell under bright conditions, and dissipates the heat again through the heat sink and the heat dissipation fan in sequence, thereby transferring the heat inside the shell to the outside. In addition, the connection part of the heat sink can be in close contact with the OFF light baffle to achieve zero gap, effectively ensuring the safety factor of the metal after plasticization.

[0142] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0143] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A projection device, characterized in that: include: case; an optical path unit, the optical path unit being disposed on the housing and comprising a light source, a light valve, and a lens; a light beam generated by the light source being modulated by the light valve and then emitted by the lens; A heat dissipation unit is arranged on the housing, and the heat dissipation unit includes a baffle and a heat dissipation member. The baffle is arranged between the light valve and the lens to block part of the light. The heat dissipation member includes a connecting portion and a heat dissipation portion. The connecting portion has a first abutting surface, and the baffle has a second abutting surface. The first abutting surface and the second abutting surface are in contact with each other, and the heat dissipation portion faces the air outlet of the heat dissipation fan in the projection device.

2. The projection device according to claim 1, wherein: One end of the baffle is connected to the side wall of the housing, and the other end of the baffle abuts against the heat sink. The connecting portion protrudes toward the baffle so that the first abutting surface abuts against the second abutting surface. Along the length direction of the connecting portion, the length of the connecting portion is smaller than the length of the heat dissipation portion.

3. The projection device according to claim 1, wherein: The baffle and the heat sink are an integrally formed structure; or, The blocking piece is connected to the heat sink.

4. The projection device according to any one of claims 1 to 3, characterized in that: The heat dissipation portion includes a heat dissipation plate and a plurality of heat dissipation fins, wherein the plurality of heat dissipation fins are arranged on the heat dissipation plate at intervals, a heat dissipation channel is formed between adjacent heat dissipation fins, and the heat dissipation fins and the connecting portion are respectively located on opposite sides of the heat dissipation plate; The length direction of the connecting portion matches the length direction of the heat dissipation plate.

5. The projection device according to claim 4, wherein: The plurality of heat dissipation fins are arranged at intervals along the length direction of the heat dissipation plate and extend along the width direction of the heat dissipation plate.

6. The projection device according to claim 4, wherein: The plurality of heat dissipation fins are arranged at intervals along the width direction of the heat dissipation plate and extend along the length direction of the heat dissipation plate.

7. The projection device according to any one of claims 1 to 3, characterized in that: The heat dissipation unit further includes a heat conducting member, which is a sheet-like structure; The first end surface of the heat conducting member is in contact with the first abutting surface, and the second end surface of the heat conducting member is in contact with the second abutting surface.

8. The projection device according to any one of claims 1 to 3, characterized in that: The heat sink further comprises a connecting piece, wherein a first connecting hole is provided on the heat sink, and a second connecting hole is provided on the shell. The connecting piece passes through the first connecting hole and the second connecting hole in sequence to connect the heat sink and the shell.

9. A projection device, characterized in that: include: case; lens; The heat dissipation unit is arranged on the shell, and the heat dissipation unit includes a baffle and a heat dissipation member. The baffle is arranged above the side of the lens, and the heat dissipation member abuts against the baffle to dissipate heat from the baffle.

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

Images