Projection device and projection system

Abstract

This application provides a projection device and projection system, relating to the field of optoelectronic technology. The projection device includes: a lens assembly, which includes a housing and a rear lens barrel, one end of which is located inside the housing and the other end outside the housing; an illumination assembly, which includes an illumination housing; and a thermal balance assembly, which includes a heat-conducting ring that is sleeved with the rear lens barrel located outside the housing and abuts against the illumination housing. By setting up the thermal balance assembly, this application enables heat transfer between the rear lens barrel and the illumination housing, achieving temperature balance for the entire system. This prevents the rear lens barrel from becoming too hot or too cold, avoids thermal expansion and contraction, and ensures that the lenses in the rear lens barrel are properly positioned to match the light source in the illumination assembly, thus maintaining good clarity of the projected image.

Description

Projection device and projection system

[0001] This application claims priority to Chinese patent application No. 202311344349.2, filed on October 17, 2023, with application name “Projection device and projection system”, and priority to Chinese patent application No. 202311683862.4, filed on December 8, 2023, with application name “Projection equipment and projection system”, and priority to Chinese patent application No. 202323356223.5, filed on December 8, 2023, with application name “Projection equipment and projection system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optoelectronic technology, and in particular to a projection device and a projection system. Background Art

[0003] A projection device generally includes an illumination assembly and a lens assembly. The illumination assembly serves as a light source to provide an image beam, and the lens assembly receives the image beam and corrects and magnifies it to project an image.

[0004] In related technologies, based on low-cost considerations, the lenses in the lens assembly are installed using a plastic lens barrel. However, due to the low thermal conductivity of plastic, the temperature of the lens barrel fluctuates greatly, causing the lens barrel to expand and contract due to heat and cold, thereby causing the lens to shift. The position of the light source in the lighting assembly cannot be adapted to it, resulting in a decrease in the clarity of the projected image.

[0005] Public content

[0006] Embodiments of the present application provide a projection device and a projection system.

[0007] In one aspect, an embodiment of the present application provides a projection device, comprising:

[0008] A lens assembly comprising a housing and a rear lens barrel, wherein one end of the rear lens barrel is located inside the housing and the other end of the rear lens barrel is located outside the housing;

[0009] A lighting assembly, the lighting assembly comprising a lighting housing;

[0010] A heat balance component includes a heat conducting ring, the heat conducting ring is sleeved with the rear group lens barrel located outside the shell, and the heat conducting ring abuts against the lighting shell.

[0011] On the other hand, an embodiment of the present application provides a projection system, including a projection screen and the projection device described in the present application, wherein the projection device is used to project a projection image onto the projection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the implementation methods in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0013] FIG1 is a structural cross-sectional view of a projection device provided by the prior art;

[0014] FIG2 is an exploded view of the structure of a projection device provided in an embodiment of the present application;

[0015] FIG3 is an exploded view of the structure of a projection device provided in an embodiment of the present application;

[0016] FIG4 is a cross-sectional view of a partial structure of a projection device provided in an embodiment of the present application;

[0017] FIG5 is a partial structural cross-sectional view of a projection device in an exploded state provided by an embodiment of the present application;

[0018] FIG6 is a partial structural cross-sectional view of another projection device in an exploded state provided by an embodiment of the present application;

[0019] FIG7 is an exploded view of the structure of a projection device provided in an embodiment of the present application;

[0020] FIG8 is a schematic structural diagram of a first elastic member in a projection device provided in an embodiment of the present application;

[0021] FIG9 is a schematic diagram of a partial structure of a first elastic member in a projection device provided in an embodiment of the present application;

[0022] FIG10 is an exploded view of the structure of another projection device provided in an embodiment of the present application;

[0023] FIG11 is an exploded view of another projection device provided in an embodiment of the present application;

[0024] FIG12 is a partial cross-sectional view of another projection device in an exploded state provided by an embodiment of the present application;

[0025] FIG13 is a partial cross-sectional view of another projection device provided in an embodiment of the present application;

[0026] FIG14 is an exploded view of the structure of another projection device provided in an embodiment of the present application;

[0027] FIG15 is an exploded view of the structure of another projection device provided in an embodiment of the present application;

[0028] FIG16 is a cross-sectional view of a partial structure of another projection device provided in an embodiment of the present application;

[0029] FIG17 is a partial cross-sectional view of another projection device in an exploded state provided by an embodiment of the present application;

[0030] FIG18 is a partial structural cross-sectional view of another projection device provided in an embodiment of the present application;

[0031] FIG19 is a schematic structural diagram of an aperture in a projection device provided by the prior art;

[0032] FIG20 is a schematic structural diagram of another aperture in a projection device provided by the prior art;

[0033] FIG21 is a schematic structural diagram of another aperture in a projection device provided by the prior art;

[0034] FIG22 is a schematic structural diagram of another projection device provided in an embodiment of the present application;

[0035] FIG23 is a partial enlarged view of point I in FIG21;

[0036] FIG24 is a schematic structural diagram of an aperture provided in an embodiment of the present application;

[0037] FIG25 is a schematic diagram of a partial structure of an aperture in a projection device provided in an embodiment of the present application;

[0038] FIG26 is a schematic structural diagram of a lens assembly provided in an embodiment of the present application;

[0039] FIG27 is a cross-sectional view of the structure of a lens assembly provided in an embodiment of the present application;

[0040] FIG28 is a cross-sectional view of another lens assembly provided in an embodiment of the present application;

[0041] FIG29 is a cross-sectional view of the structure of another lens assembly in an exploded state provided by an embodiment of the present application;

[0042] FIG30 is a cross-sectional view of the structure of another aperture in the projection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention.

[0044] Figure 1 is a cross-sectional view of a conventional projection device. As shown in Figure 1, a projection device generally includes a lens assembly 002 and an illumination assembly 001. The illumination optical path and other components in illumination assembly 001 serve as a light source 0011. Refraction between the various lenses in lens assembly 002 allows the emitted light to be focused on the projection screen, thereby displaying a normal image. To meet the requirements of low cost, the lens barrel 0022 is typically made of plastic. Because plastic has a much lower thermal conductivity than metal lens barrels, this can cause the entire rear lens barrel 0022 and the internal lenses to rise in temperature. As the temperature rises, the distance between the last lens 0021 in the rear lens group and the flange surface of the housing 0023 of the lens assembly 002 increases or decreases. This, when adapted to the existing illumination system, can result in a decrease or increase in back focus (shown as L1 in the figure), leading to thermal run-out and, consequently, poor image resolution.

[0045] In order to overcome the defects in the prior art, the projection device and projection system provided by the present invention can effectively transfer the temperature of the rear group lens barrel to the lighting housing through the setting of the thermal balance component, thereby achieving temperature balance of the entire system. The temperature of the rear group is transferred to the lighting housing through the heat conduction ring, so that the heat is fully thermally balanced with the lighting housing, and ultimately solves the problem of thermal run-out caused by excessive temperature of the rear group lens group.

[0046] 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.

[0047] Figure 2 is an exploded view of the structure of a projection device provided in an embodiment of the present application; Figure 3 is an exploded view of the structure of a projection device provided in an embodiment of the present application; and Figure 4 is a partial cross-sectional view of the structure of a projection device provided in an embodiment of the present application. Figures 2 and 3 are exploded schematic diagrams of the same embodiment at different viewing angles.

[0048] As shown in FIG. 2 to FIG. 4 , an embodiment of the present application provides a projection device 100, including:

[0049] The lens assembly 110 includes a housing 111 and a rear lens group barrel 1122 . One end of the rear lens group barrel 1122 is located inside the housing 111 , and the other end of the rear lens group barrel 1122 is located outside the housing 111 .

[0050] The lighting assembly 120 includes a lighting housing 121 .

[0051] The thermal balance assembly 130 includes a heat-conducting ring 133 . The heat-conducting ring 133 is sleeved with the rear lens group 1122 located outside the housing 111 , and the heat-conducting ring 133 abuts against the lighting housing 121 .

[0052] Through the above arrangement, i.e., through the arrangement of the heat balance assembly 130, heat can be effectively transferred between the rear lens group barrel 1122 and the lighting housing 121, achieving temperature balance for the entire system. This prevents the temperature of the rear lens group barrel 1122 from being too high or too low, and prevents the rear lens group barrel 1122 from thermal expansion and contraction. The lens in the rear lens group barrel 1122 and the light source in the lighting assembly 120 are kept in the same position, and the projection image of the projection device can maintain good clarity. In particular, after the projection device 100 has been running for a long time, the clarity of the projection image will not decrease, and the working performance and working stability are improved.

[0053] Among them, the heat-conducting ring 133 in the heat balance assembly 130 is sleeve-connected with the rear lens group barrel 1122 and abuts against the lighting housing 121. When the temperature of the rear lens group barrel 1122 is high, in order to prevent the rear lens group barrel 1122 from expanding and deforming, the heat-conducting ring 133 can transfer the heat of the rear lens group barrel 1122 to the lighting housing 121, and then the lighting housing 121 dissipates the heat outward. When the temperature of the rear lens group barrel 1122 is low, in order to prevent the rear lens group barrel 1122 from shrinking and deforming, the heat-conducting ring 133 can transfer the heat of the lighting housing 121 to the rear lens group barrel 1122, so that the rear lens group barrel 1122 maintains a certain temperature. The heat of the lighting housing 121 can be the heat generated during the electro-optical conversion process of the lighting assembly 120.

[0054] The heat generated during the electro-optical conversion process of the lighting assembly 120 is related to the brightness of the lighting assembly 120. The greater the lumen, the higher the brightness, and the more heat is generated.

[0055] FIG5 is a partial cross-sectional view of the structure of a projection device in an exploded state provided by an embodiment of the present application; FIG6 is a partial cross-sectional view of the structure of another projection device in an exploded state provided by an embodiment of the present application.

[0056] As shown in Figures 5 and 6, in some embodiments, the heat conductive ring 133 includes a sleeve portion 1333 and a disk portion 1334; the sleeve portion 1333 is sleeved with the rear group lens barrel 1122, and the inner peripheral wall of the sleeve portion 1333 is connected to the outer peripheral wall of the rear group lens barrel 1122; the disk portion 1334 is connected to the outer peripheral wall of the sleeve portion 1333, and the disk portion 1334 faces the first side wall 1331 of the lighting housing 121 and abuts against the lighting housing 121.

[0057] Through the above arrangement, the heat-conducting ring 133 can be connected to the rear lens group barrel 1122 via the shaft sleeve portion 1333, thereby providing a larger contact area between the two, thereby achieving greater heat transfer efficiency. The heat-conducting ring 133 can also abut against the lighting housing 121 via the first side wall 1331 of the disc-shaped portion 1334, thus providing a larger contact area and heat transfer efficiency.

[0058] In some embodiments, the axial length of the sleeve portion 1333 is greater than the thickness of the disc portion 1334 .

[0059] As shown in FIG. 5 and FIG. 6 , in some embodiments, the disc-shaped portion 1334 facing away from the second sidewall 1332 of the lighting housing 121 is aligned with the end surface of the sleeve portion 1333 facing away from the lighting housing 121 .

[0060] As shown in FIG. 5 and FIG. 6 , in some embodiments, the first side wall 1331 is aligned with the end surface of the shaft sleeve portion 1333 facing the lighting housing 121 .

[0061] Thus, the disc-shaped portion 1334 and the sleeve portion 1333 of this embodiment can have two different structural forms, allowing the thermal balance assembly 130 and its thermally conductive ring 133 to adapt to different installation environments. For example, when there is sufficient space on the side of the lighting housing 121, a structural solution is adopted in which the first sidewall 1331 is aligned with the end surface of the sleeve portion 1333 facing the lighting housing 121. Correspondingly, when there is sufficient space on the side of the lens assembly 110, a structural solution is adopted in which the second sidewall 1332 is aligned with the end surface of the sleeve portion 1333 facing away from the lighting housing 121.

[0062] It should be noted that in order to solve the problem of designing different thermal balance solutions for systems on different platforms, the temperature of the rear group barrel 1122 and the temperature of the lighting housing 121 are achieved in a stable equilibrium state, so that the back focus is always within the effective processing range.

[0063] As shown in FIG. 2 to FIG. 9 , an embodiment of the present application provides a projection device 100, including:

[0064] The lens assembly 110 includes a housing 111 and a lens group arranged in the housing 111. The lens group includes a rear group lens group 112. The rear group lens group 112 includes a rear group lens 1121 and a rear group lens barrel 1122. The rear group lens 1121 is installed in the rear group lens barrel 1122, and the rear group lens barrel 1122 has a mounting portion 11221 adapted to the housing 111.

[0065] The lighting assembly 120 includes a lighting housing 121 .

[0066] The thermal balance assembly 130 is located between the lighting housing 121 and the rear lens group barrel 1122. The thermal balance assembly 130 includes a first elastic member 131 and a heat-conducting ring 133. Both the first elastic member 131 and the heat-conducting ring 133 are sleeved on the rear lens group barrel 1122. The inner edge of the heat-conducting ring 133 is sleeved with the side wall of the rear lens group barrel 1122, and the heat-conducting ring 133 has a first side wall 1331 facing the lighting housing 121 and a second side wall 1332 facing away from the lighting housing 121. The first side wall 1331 and the lighting housing 121 abut against each other for heat conduction; the first elastic member 131 abuts between the end surface of the mounting portion 11221 and the second side wall 1332. The first elastic member 131 is retractable in the direction of incident light to achieve a heat-conducting connection between the mounting portion 11221 and the lighting housing 121.

[0067] Through the above-mentioned arrangement, that is, through the arrangement of the thermal balance component 130, the temperature of the rear group lens barrel 1122 can be effectively transferred to the lighting housing 121, thereby achieving temperature balance of the entire system. By adding the arrangement of the first elastic member 131, it is ensured that the mounting portion 11221 can always transfer the heat of the rear group to the heat-conducting ring 133 through the first elastic member 131, wherein the temperature of the rear group is transferred to the end face portion of the first elastic member 131 through the mounting portion 11221, and then the first elastic member 131 transfers the temperature to the heat-conducting ring 133 through the other end face. The heat-conducting ring 133 is in contact with the lighting housing 121, so that the heat is fully thermally balanced with the lighting housing 121, and finally the thermal run-focus problem caused by the excessive temperature of the rear group lens group 112 is solved.

[0068] The following describes in detail the structures of the various parts of the projection device 100:

[0069] Due to the requirements of optical design, the lenses in the lens assembly 110 are usually divided into multiple groups. For example, the lenses can be divided into a front group and a rear group, or into a front group, a middle group and a rear group, etc. Each group usually includes multiple lenses, such as spherical or aspherical lenses.

[0070] The lens assembly may include a rear lens assembly 112 and a front lens assembly. The front lens assembly is located outside the housing 111 of the projection device 100 , and the rear lens assembly 112 is disposed at the rear end of the front lens assembly.

[0071] It should be noted that the housing 111 is used to install the lens assembly, and the accommodating space of the housing 111 is slightly larger than the external dimensions of the lens assembly.

[0072] In some embodiments, the housing 111 may be a metal member, and its material may include one or more of copper, iron, aluminum, tin, and lead.

[0073] In some embodiments, the housing 111 may be made of plastic.

[0074] It should be noted that the specific material of the shell 111 is not excessively limited in the embodiment of the present application.

[0075] Of course, during manufacturing, the housing 111 can also be made of steel plates, plastics or synthetic materials while ensuring strength.

[0076] Correspondingly, the rear lens group barrel 1122 is used to install and accommodate the rear lens group 1121. When the rear lens group 1121 is installed in the rear lens group barrel 1122, a whole is formed, which is then installed in the housing 111.

[0077] In some embodiments, the material of the rear lens barrel 1122 and the lighting housing 121 may be the same as or different from that of the housing 111 . Specifically, the material may be adjusted according to actual conditions.

[0078] In some embodiments, the rear lens barrel 1122 and the lighting housing 121 may be metal parts, and their materials may include one or more of copper, iron, aluminum, tin, and lead.

[0079] In some embodiments, the rear lens group 1122 and the lighting housing 121 may be made of plastic.

[0080] Of course, during manufacturing, under the premise of ensuring strength, the rear group lens barrel 1122 and the lighting housing 121 can also be made of steel plates, plastics or synthetic materials.

[0081] It should be noted that the projection device 100 can generally be a laser TV, a projector, or other device capable of image projection. In order to achieve the projection of the image, the projection device 100 also includes an optical unit, which includes a digital micromirror device (DMD) and a lighting light path in the front lighting assembly 120. The lighting light path can be used as a light source to provide light; and the digital micromirror device is filled with micro light valves or light path switches, which can be used to open and close the light path so that the light emitted by the lighting light path is selectively passed through, thereby forming an image.

[0082] In order to focus, zoom, and perform other operations on the light emitted from the optical unit so that a normal image is projected on the projection screen, the projection device 100 also includes a lens assembly 110. The lens assembly 110 includes multiple groups of lenses, each of which includes one or more lenses. Through refraction between the different lenses, the light emitted from the optical assembly can be focused on the projection screen, thereby displaying a normal image. To secure the lenses, the lens assembly 110 also includes at least two lens barrels. Multiple lenses can be fixed in each barrel at predetermined intervals, achieving imaging through the refraction of light by the lenses.

[0083] It should be noted that, since the rear group lens barrel 1122 usually partially extends into the interior of the lighting assembly 120, the outer wall of the rear group lens barrel 1122 that extends into the interior of the lighting assembly 120 can be connected to the heat balance assembly 130, and the heat balance assembly 130 is then connected to the lighting housing 121 of the lighting assembly 120. In this way, the heat of the lighting housing 121 can be transferred to the rear group lens barrel 1122 through the heat balance assembly 130, or the heat of the rear group lens barrel 1122 can be transferred to the lighting housing 121 through the heat balance assembly 130, thereby achieving temperature balance of the entire system.

[0084] Specifically, the front lens group is typically located at the front end of the lens assembly, that is, away from the lighting assembly 120, while the rear lens group 112 is located at the rear end of the lens assembly, that is, closer to the lighting assembly 120. The front lens group and the rear lens group 112 can move forward and backward along the axis of the lens assembly, that is, the optical axis, to change the relative distance between the lenses in the front lens group and the lenses in the rear lens group 112, thereby achieving a focusing function.

[0085] Because rear lens assembly 112 is positioned near illumination assembly 120, the lenses in rear lens assembly 112 are significantly affected by light and heat up quickly. Furthermore, because rear lens assembly 112 is at least partially shielded by illumination assembly 120, its heat is difficult to dissipate. Therefore, connecting thermal balance assembly 130 to rear lens assembly 112 balances heat between illumination housing 121 and rear lens barrel 1122, preventing heat accumulation and ensuring proper imaging.

[0086] It should be noted that the lighting housing 121 can transfer heat to the first side wall 1331 of the thermally conductive ring 133 through the thermally conductive ring 133, and the first side wall 1331 of the thermally conductive ring 133 transfers the heat to the second side wall 1332 of the thermally conductive ring 133, and then the heat can be transferred to the mounting portion 11221 through the first elastic member 131; accordingly, the heat of the rear group lens barrel 1122 can be transferred to the first elastic member 131, and the heat can be transferred to the second side wall 1332 of the thermally conductive ring 133 through the first elastic member 131, and the second side wall 1332 of the thermally conductive ring 133 transfers the heat to the first side wall 1331 of the thermally conductive ring 133, and then the heat can be transferred to the lighting housing 121, so as to achieve thermal balance between the lighting housing 121 and the rear group lens barrel 1122.

[0087] As shown in Figures 2 to 5, in some embodiments, the rear lens group barrel 1122 is cylindrical, and the mounting portion 11221 is a stepped shoulder structure arranged on the outer peripheral wall of the rear lens group barrel 1122. The housing 111 is provided with an assembly hole (not shown) that cooperates with the mounting portion 11221. After the rear lens group barrel 1122 extends into the housing 111, the mounting portion 11221 is mated and connected with the assembly hole. The mounting portion 11221 has an annular end surface facing the illumination housing 121. The first elastic member 131 is connected to the mounting portion 11221 to obtain a larger abutment area, thereby facilitating improved heat exchange efficiency between the rear lens group barrel 1122 and the first elastic member 131.

[0088] As shown in Figures 2 to 5, 8 and 9, in some embodiments, the distance between the end face of the mounting portion 11221 and the end face of the lighting housing 121 is ≤1 mm (or described as less than or equal to 1 mm). For details, please refer to Figure 4, where A represents the dimension between the end face of the mounting portion 11221 and the end face of the lighting housing 121 of this scheme.

[0089] The thickness of the first elastic member 131 ranges from 0.05 mm to 0.1 mm.

[0090] It should be noted that the distance between the end surface of the mounting portion 11221 and the end surface of the lighting housing 121 can meet the requirement of a small size of the projection device 100. Furthermore, in the case of a small size, the first elastic member 131 can achieve better thermal balance.

[0091] In addition, it should be noted that the material of the first elastic member 131 can be metal to facilitate heat conduction. In some examples, the material of the first elastic member 131 is copper.

[0092] In some embodiments, the thickness of the first elastic member 131 is designed to ensure heat transfer between the rear lens group 1122 and the heat conducting ring 133 while not transmitting torque to the mounting portion 11221 .

[0093] As shown in Figures 5 to 9, in some embodiments, the first elastic member 131 includes a first heat-conducting portion 1311 and a second heat-conducting portion 1312. The first heat-conducting portion 1311 abuts against the end surface of the mounting portion 11221, and the second heat-conducting portion 1312 abuts against the second side wall 1332. The first elastic member 131 is used to transfer heat between the rear group lens barrel 1122 and the heat-conducting ring 133.

[0094] It should be noted that the inner edge of the heat-conducting ring 133 can match the size of the side wall of the rear group lens barrel 1122, so that the inner edge of the heat-conducting ring 133 will fit together with the side wall of the rear group lens barrel 1122, so that good contact can be achieved between the side wall of the rear group lens barrel 1122 and the heat-conducting ring 133, so that the heat on the rear group lens barrel 1122 can be efficiently transferred to the heat-conducting ring 133.

[0095] Secondly, due to tolerance issues, there is a gap between the mounting portion 11221 of the side wall of the rear group lens barrel 1122 and the heat-conducting ring 133. In order to ensure the heat transfer effect, the first elastic member 131 is located in the gap, and the first heat-conducting portion 1311 and the second heat-conducting portion 1312 are respectively located on two opposite surfaces of the first elastic member 131. The first heat-conducting portion 1311 abuts against the end surface of the mounting portion 11221, and the second heat-conducting portion 1312 abuts against the second side wall 1332, which facilitates the transfer of heat on the rear group lens barrel 1122.

[0096] The heat-conducting ring 133 generally extends radially outward, and the outwardly extending portion can be connected to the lighting housing 121 of the lighting assembly 120 to transfer heat from the rear lens group 1122 to the lighting housing 121. In this way, the heat-conducting ring 133 acts as a heat transfer medium to realize the heat transfer process between the rear lens group 1122 and the lighting housing 121, so that the rear lens group 1122 is effectively cooled.

[0097] It should be noted that the heat conduction area of ​​the first heat conduction part 1311 can be smaller than the heat conduction area of ​​the second heat conduction part 1312. The temperature of the rear group is transferred to the small heat conduction end surface of the first heat conduction part 1311 of the first elastic member 131 through the mounting part 11221, and then the first elastic member 131 transfers the temperature to the heat conduction ring 133 through the large heat conduction end surface of the second heat conduction part 1312. The heat conduction ring 133 is in contact with the lighting housing 121, so that the heat is fully thermally balanced with the lighting housing 121.

[0098] Of course, the heat conduction area of ​​the first heat conduction part 1311 can be larger than the heat conduction area of ​​the second heat conduction part 1312. The temperature of the rear group lens barrel 1122 is transferred to the large heat conduction end surface of the first heat conduction part 1311 of the first elastic member 131 through the mounting part 11221, and then the first elastic member 131 transfers the temperature to the heat conduction ring 133 through the small heat conduction end surface of the second heat conduction part 1312. The heat conduction ring 133 is in contact with the lighting housing 121, so that the heat is fully thermally balanced with the lighting housing 121.

[0099] Accordingly, the heat conduction area of ​​the first heat conduction part 1311 can be equal to the heat conduction area of ​​the second heat conduction part 1312. The specific size and dimensions of the heat conduction area can be adjusted according to actual conditions and are not subject to excessive restrictions here.

[0100] As shown in Figures 8 and 9, in some embodiments, the first elastic member 131 further includes a telescopic portion 1313, which is located between the first heat conducting portion 1311 and the second heat conducting portion 1312, and the opposite ends of the telescopic portion 1313 are respectively connected to the first heat conducting portion 1311 and the second heat conducting portion 1312.

[0101] It should be noted that the design of the telescopic portion 1313 facilitates the first heat-conducting portion 1311 of the first elastic member 131 to better adhere to the end face of the mounting portion 11221, and the second heat-conducting portion 1312 to better adhere to the second side wall 1332 of the heat-conducting ring 133, so as to better transfer heat between the mounting portion 11221 and the heat-conducting ring 133.

[0102] In some embodiments, the first heat conducting portion 1311, the telescopic portion 1313, and the second heat conducting portion 1312 are integrally formed and inseparable. This reduces the number of components, eases assembly difficulty and precision requirements, and eliminates the need for welding the first heat conducting portion 1311, the telescopic portion 1313, and the second heat conducting portion 1312, thereby improving assembly efficiency. Furthermore, this improves the overall strength of the first elastic member 131, reduces the likelihood of loosening between the first heat conducting portion 1311, the telescopic portion 1313, and the second heat conducting portion 1312, and provides a higher structural strength.

[0103] It should be noted that in some embodiments, the first heat conducting portion 1311, the telescopic portion 1313, and the second heat conducting portion 1312 are connected in an integral manner. In other embodiments, the first heat conducting portion 1311, the telescopic portion 1313, and the second heat conducting portion 1312 may also be connected in other manners. As long as a connection method that can securely connect the first heat conducting portion 1311, the telescopic portion 1313, and the second heat conducting portion 1312 can achieve the purpose of this embodiment, the connection method of the first heat conducting portion 1311, the telescopic portion 1313, and the second heat conducting portion 1312 is not limited.

[0104] As shown in FIG8 , in some embodiments, the cross-section of the first elastic member 131 is annular. When the second side wall 1332 of the heat-conducting ring 133 and the end surface of the mounting portion 11221 are pressed against each other, the first elastic member 131 is deformed.

[0105] It should be noted that the first elastic member 131 can be an integral member with a circular cross-section, which is convenient for being sleeved on the side wall of the rear group lens barrel 1122. The first elastic member 131 is a metal plate-like body, which can undergo a certain elastic deformation when subjected to force.

[0106] Through the deformation of the first elastic member 131 , the rear lens group barrel 1122 , the first elastic member 131 , the heat conducting ring 133 and the lighting housing 121 are effectively in contact with each other, thereby ensuring a thermal balance effect.

[0107] As shown in Figures 2 to 5, 8 and 9, in some embodiments, the thermal balance assembly 130 also includes a second elastic member 132, which is arranged on the flange surface of the shell 111 facing the lighting shell 121, and the second elastic member 132 is used to elastically press the thermal conductive ring 133 onto the lighting shell 121.

[0108] Through the above arrangement, the second elastic member 132 can apply an elastic force to the thermal conductive ring 133 along the incident direction of the light, elastically pressing the thermal conductive ring 133 onto the lighting housing 121, so that the first side wall 1331 of the thermal conductive ring 133 is completely tightly attached to the lighting housing 121, thereby achieving sufficient heat conduction between the thermal conductive ring 133 and the lighting housing 121.

[0109] As shown in FIG. 5 , in some embodiments, when the thermal balance assembly 130 includes the first elastic member 131 , the first elastic member 131 is located between the second elastic member 132 and the thermal conductive ring 133 .

[0110] The second elastic member 132 has elastic force along the incident direction of the light and is used to press the heat conducting ring 133 against the end surface of the lighting housing 121 .

[0111] It should be noted that the second elastic member 132 is arranged on the flange surface of the shell 111 and has elastic force along the incident direction of the light. Part of the second elastic member 132 is exposed on the outside of the flange surface of the shell 111 along the incident direction of the light, and abuts against the first elastic member 131, thereby pressing the heat-conducting ring 133 abutting against the end face of the lighting shell 121, so that the first side wall 1331 of the heat-conducting ring 133 is completely tightly attached to the lighting shell 121 to fully conduct heat.

[0112] In some embodiments, the second elastic member 132 is bent and installed on the flange surface of the housing 111 , that is, along the incident direction of light, part of the second elastic member 132 is located inside the housing 111 , and another part of the second elastic member 132 is located outside the housing 111 .

[0113] As shown in Figures 5 and 6, in some embodiments, the second elastic member 132 is an annular member, and the second elastic member 132 has a bending portion, which is formed around the center of the second elastic member 132, and the distances between different parts of the bending portion and the wall surface of the thermal conductive ring 133 are different.

[0114] It should be noted that such a configuration allows the bent portion of the second elastic member 132 to better squeeze the first side wall 1331 of the heat-conducting ring 133 , so that the second side wall 1332 of the heat-conducting ring 133 is completely in close contact with the lighting housing 121 for sufficient heat conduction.

[0115] As shown in Figures 2 to 5, 8 and 9, in some embodiments, the thermal balance assembly 130 further includes a retaining spring 134, and a retaining groove is provided on the rear group lens barrel 1122, and the retaining spring 134 is retained in the retaining groove; along the radial direction of the rear group lens barrel 1122, at least part of the retaining spring 134 protrudes from the slot opening and is used to fix the thermal conductive ring 133.

[0116] It should be noted that the provision of the retaining spring 134 can better fix the heat-conducting ring 133 to ensure the stability of the heat-conducting ring 133 sleeved on the side wall of the rear lens group barrel 1122 .

[0117] In some embodiments, the retaining spring 134 is in the shape of a thin sheet and may be in the shape of a semi-ring.

[0118] Figure 10 is an exploded view of another projection device provided in an embodiment of the present application; Figure 11 is an exploded view of another projection device provided in an embodiment of the present application; Figure 12 is a partial cross-sectional view of another projection device provided in an embodiment of the present application in an exploded state; and Figure 13 is a partial cross-sectional view of another projection device provided in an embodiment of the present application. Figures 10 and 11 are exploded schematic views of the same embodiment at different viewing angles.

[0119] It should be noted that, when the temperature of the rear mirror group 112 is high, and there is insufficient clearance between the rear mirror group 112 and the lighting housing 121, and the rear mirror group 112 and the surrounding housing 111 cannot be reduced in size to avoid the gap, the embodiments corresponding to Figures 5 and 11 can be used.

[0120] 5 , a first elastic member 131 is added to ensure that the mounting portion 11221 can always transfer the heat of the rear group to the heat-conducting ring 133 through the first elastic member 131. The temperature of the rear group is transferred to the end face of the first elastic member 131 through the mounting portion 11221. Then, the first elastic member 131 transfers the temperature to the heat-conducting ring 133 through the other end face. The heat-conducting ring 133 is in contact with the lighting housing 121, so that the heat is fully thermally balanced with the lighting housing 121, and finally the thermal run-out problem caused by the excessive temperature of the rear group lens assembly 112 is solved.

[0121] Figure 14 is an exploded view of another projection device provided in an embodiment of the present application; Figure 15 is an exploded view of another projection device provided in an embodiment of the present application; and Figure 16 is a partial cross-sectional view of another projection device provided in an embodiment of the present application. Figures 14 and 15 are exploded views of the same embodiment at different viewing angles.

[0122] If the temperature of the rear lens assembly 112 is high, there is sufficient clearance between the rear lens assembly 112 and the lighting housing 121, and the rear lens assembly 112 and the surrounding housing 111 can be reduced to avoid the gap, the embodiments corresponding to Figures 6, 14, and 15 can be used. In Figure 16, B represents the distance between the end surface of the mounting portion 11221 and the end surface of the lighting housing 121 in this embodiment. Comparing Figures 16 and 13, it can be seen that distance B is greater than distance A.

[0123] FIG17 is a partial structural cross-sectional view of another projection device provided in an embodiment of the present application in an exploded state, and FIG18 is a partial structural cross-sectional view of another projection device provided in an embodiment of the present application.

[0124] When the position of the rear lens group 112 cannot be reduced or the focus deviation is not large, the embodiments corresponding to Figures 16 and 18 can be used. In Figure 18, B represents the distance between the end face of the mounting portion 11221 and the end face of the lighting housing 121. Comparing Figures 16 and 18, it can be seen that the distance between the end face of the mounting portion 11221 and the end face of the lighting housing 121 is the same in both embodiments.

[0125] Therefore, when the temperature of the rear lens group 112 is relatively high, there is sufficient clearance between the rear lens group 112 and the lighting housing 121, and the rear lens group 112 and the surrounding housing 111 can be reduced in size to avoid gaps, the heat-conducting contact position in the embodiments corresponding to Figures 16 and 18 is closer to the rear lens group assembly support surface and the relatively sensitive position, which can more effectively solve the problem of large lens focus deviation.

[0126] The projection device provided by the embodiment of the present application includes: a lens assembly, the lens assembly includes a shell and a lens group arranged in the shell, the lens group includes a rear group lens group, the rear group lens group includes a rear group lens and a rear group lens barrel, the rear group lens is installed in the rear group lens barrel, and the rear group lens barrel has a mounting portion adapted to the shell; an illumination assembly, the illumination assembly includes an illumination shell; a thermal balance assembly, the thermal balance assembly is located between the illumination shell and the rear group lens barrel, the thermal balance assembly includes a first elastic member and a heat-conducting ring, the first elastic member and the heat-conducting ring are both sleeved on the rear group lens barrel, the inner edge of the heat-conducting ring is sleeved with the side wall of the rear group lens barrel, and the heat-conducting ring has a first side wall facing the illumination shell and a second side wall facing away from the illumination shell, the first side wall and the illumination shell abut against each other for heat conduction; the first elastic member abuts between the end face of the mounting portion and the second side wall, and the first elastic member is retractable in the incident direction of light to achieve a heat-conducting connection between the mounting portion and the illumination shell.

[0127] By setting up the thermal balance component, the temperature of the rear group lens barrel can be effectively transferred to the lighting housing, thereby achieving temperature balance of the entire system. By setting up the additional first elastic member, it is ensured that the mounting portion can always transfer the heat of the rear group through the first elastic member to the heat-conducting ring, wherein the temperature of the rear group is transferred to the end face portion of the first elastic member through the mounting portion, and then the first elastic member transfers the temperature to the heat-conducting ring through the other end face. The heat-conducting ring contacts the lighting housing, so that the heat is fully thermally balanced with the lighting housing, and finally the problem of thermal run-out caused by excessive temperature of the rear group lens group is solved.

[0128] As shown in FIG. 2 to FIG. 18 , an embodiment of the present application further provides a projection device 100, comprising:

[0129] The lens assembly 110 includes a housing 111 , a rear lens group 1121 and a rear lens barrel 1122 disposed in the housing 111 . The rear lens group 1121 is mounted in the rear lens barrel 1122 , and the rear lens barrel 1122 has a mounting portion 11221 adapted to the housing 111 .

[0130] The lighting assembly 120 includes a lighting housing 121 .

[0131] The thermal balance component 130 is located between the end face of the lighting housing 121 and the rear group lens barrel 1122. The thermal balance component 130 includes a first elastic member 131 and a heat-conducting ring 133. The first elastic member 131 abuts between the end face of the mounting portion 11221 and the wall surface of the heat-conducting ring 133. The inner edge of the heat-conducting ring 133 is sleeved on the side wall of the rear group lens barrel 1122 for transferring heat between the rear group lens barrel 1122 and the lighting housing 121.

[0132] The projection device 100 provided in the embodiment of the present application can effectively transfer the temperature of the rear lens group barrel to the lighting housing, thereby achieving temperature balance of the entire system and ultimately solving the problem of thermal focus deviation caused by excessive temperature of the rear lens group.

[0133] In addition, an embodiment of the present application further provides a projection system, including a projection screen and a projection device 100 of any corresponding embodiment of Figures 2 to 18, wherein the projection device 100 is used to project a projection image onto the projection screen.

[0134] The projection screen includes a display film, and the front side of the display film is a projection light receiving surface.

[0135] It should be noted that the display film can usually be composed of a hard layer, a Fresnel structure layer and a projection layer, etc., and has a certain strength and rigidity. Moreover, it can have a certain verticality in the vertical free hanging state, making the display film look flat. However, since it still has a certain softness, if it is not supported or is disturbed by external forces, the display film still cannot meet the flatness requirements required for display. The screen is uneven, which will cause the laser projection image to be deformed, blurred, uneven in brightness, or other degradation problems.

[0136] In order to achieve flatness of the display film, in some embodiments, the display film includes a film body and a connecting cloth that are bonded to each other.

[0137] Generally, the diaphragm body is made of a rigid material, and the connecting cloth generally has the characteristics of being inelastic, ultra-thin, dense and high-strength. In this way, when the connecting cloth and the diaphragm body are bonded, an integrated structure can be formed between the two, thereby facilitating the transmission of force and enabling the diaphragm body to stretch following the deformation of the connecting cloth.

[0138] Specifically, the connecting cloth can generally be a soft cloth, so that the connecting cloth can better transmit the force when stretched, and has a relatively stable property and can adapt to a wider range of environments.

[0139] In the projection system of this embodiment, the projection device 100 can be any existing projector, such as a laser projector. The projection device 100 can project a projection image onto the display film of the projection screen, which then displays the projection image for viewing. The specific structure, operating principle, and function of the projection device 100 have been described in detail in the aforementioned first embodiment and will not be repeated here.

[0140] By setting up the thermal balance component, the temperature of the rear group lens barrel can be effectively transferred to the lighting housing, thereby achieving temperature balance of the entire system. By setting up the additional first elastic member, it is ensured that the mounting portion can always transfer the heat of the rear group through the first elastic member to the heat-conducting ring, wherein the temperature of the rear group is transferred to the end face portion of the first elastic member through the mounting portion, and then the first elastic member transfers the temperature to the heat-conducting ring through the other end face. The heat-conducting ring contacts the lighting housing, so that the heat is fully thermally balanced with the lighting housing, and finally the problem of thermal run-out caused by excessive temperature of the rear group lens group is solved.

[0141] Figure 19 is a schematic diagram of the structure of a diaphragm in a conventional projection device, Figure 20 is a schematic diagram of the structure of another diaphragm in a conventional projection device, and Figure 21 is a schematic diagram of the structure of yet another diaphragm in a conventional projection device. As shown in Figures 19 and 21, lens 0021 and diaphragm 0024 are coaxially arranged within lens barrel 0022, with lens 0021 located on the light-entry side and diaphragm 0024 located on the light-exit side.

[0142] To meet the demand for low costs, the lens barrel 0022 in related art is typically made of plastic, and the aperture 0024 is relatively thin. Because the thermal conductivity of plastic is much lower than that of a metal lens barrel 0022, the heat received by the aperture 0024 rapidly accumulates and continues to heat up at the surface in contact with the plastic lens barrel 0022. However, if the aperture 0024 is too thin, heat dissipation is slow, resulting in a sharp increase in the contact surface temperature. If the aperture 0024 is too thick, it will increase costs and have little significant improvement in heat dissipation. If the temperature at the contact surface between the aperture 0024 and the plastic lens barrel 0022 is too high, the plastic material will deteriorate and become brittle. After the machine has been running for a certain period of time, the plastic lens barrel 0022 may experience localized micro-deformation or degradation.

[0143] In order to overcome the defects in the prior art, the projection device and projection system provided by the present invention, through the design of at least one light-blocking portion, further adopt a graded light-blocking scheme to expand the diameter of the aperture hole to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body, so that the temperature of the contact surface with the plastic lens barrel can be greatly reduced. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, the heat dissipation efficiency is also improved, effectively solving the problem of overheating at the position of the plastic lens barrel and the aperture body; at the same time, it avoids the degradation of the plastic due to excessive temperature, which leads to the failure of product analysis, that is, it will not affect the lens analysis effect, effectively reducing the size of the aperture, and has a small size and low cost.

[0144] Figure 22 is a schematic structural diagram of another projection device provided in an embodiment of the present application; Figure 23 is a partial enlarged view of point I in Figure 22; Figure 24 is a schematic structural diagram of an aperture provided in an embodiment of the present application; Figure 25 is a schematic structural diagram of a partial aperture in the projection device provided in an embodiment of the present application.

[0145] As shown in FIG. 22 to FIG. 25 , in some embodiments, the lens assembly 110 further includes a rear lens group 1121 and an aperture 1123 .

[0146] The aperture 1123 and the rear lens group 1121 are both disposed in the rear lens group barrel 1122 , and the rear lens group 1121 constitutes a lens group, and the aperture 1123 is located on the light-emitting side of the lens group.

[0147] The aperture 1123 includes a cylindrical aperture body 11231, the aperture body 11231 has a light hole 11230, the inner wall of the light hole 11230 has at least one recessed area, and a light-blocking portion 11232 is formed on a side of the recessed area facing the lens group.

[0148] Through the above-mentioned arrangement, that is, through the design of at least one light-blocking portion 11232, the graded light-blocking scheme is further adopted to expand the diameter of the light-through hole 11230 to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body 11231. The temperature of the contact surface with the rear group lens barrel 1122 can be greatly reduced. While reducing the temperature of the contact surface between the aperture body 11231 and the rear group lens barrel 1122, the heat dissipation efficiency is also improved, which effectively solves the problem of overheating at the position of the rear group lens barrel 1122 and the aperture body 11231. At the same time, it avoids the degradation of plastic due to excessive temperature, which leads to the failure of product analysis. That is, it will not affect the lens analysis effect, and effectively reduces the volume of the aperture 1123, which is small in size and low in cost.

[0149] As shown in FIG. 22 to FIG. 25 , in some embodiments, the projection device 100 includes:

[0150] The device housing 150 is used as a mounting base for other components and provides protection for other components.

[0151] The lens assembly 110 includes a rear lens group 1121 and a lens barrel unit. The lens barrel unit includes a rear lens group barrel 1122 and an aperture 1123. The rear lens group barrel 1122 is set on the device housing 150. The aperture 1123 and the rear lens group 1121 are both set in the rear lens group barrel 1122, and the rear lens group 1121 constitutes a lens group. The aperture 1123 is located on the light-emitting side of the lens group.

[0152] Among them, the aperture 1123 includes a cylindrical aperture body 11231, the aperture body 11231 has a light-through hole 11230, and the axial direction of the aperture body 11231 extends along the light-outgoing direction of the lens group. The inner wall of the light-through hole 11230 has at least one recessed area, and the side of the recessed area facing the lens group forms a light-blocking portion 11232.

[0153] Through the above-mentioned arrangement, that is, through the design of at least one light-blocking portion 11232, the graded light-blocking scheme is further adopted to expand the diameter of the light-through hole 11230 to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body 11231. The temperature of the contact surface with the rear group lens barrel 1122 can be greatly reduced. While reducing the temperature of the contact surface between the aperture body 11231 and the rear group lens barrel 1122, the heat dissipation efficiency is also improved, which effectively solves the problem of overheating at the position of the rear group lens barrel 1122 and the aperture body 11231. At the same time, it avoids the degradation of plastic due to excessive temperature, which leads to the failure of product analysis. That is, it will not affect the lens analysis effect, and effectively reduces the volume of the aperture 1123, which is small in size and low in cost.

[0154] The following describes in detail the structures of the various parts of the projection device 100:

[0155] The device housing 150 is used to install the lens assembly 110 , and the accommodating space of the device housing 150 is slightly larger than the external dimensions of the lens assembly 110 .

[0156] In some examples, the device housing 150 may be made of metal or plastic. It should be noted that the material of the device housing 150 is not particularly limited in this embodiment of the present application.

[0157] The lens assembly 110 includes a rear lens group 1121 and a lens barrel unit. The lens barrel unit includes a rear lens group barrel 1122 and an aperture 1123. The rear lens group barrel 1122 is set on the device housing 150. The aperture 1123 and the rear lens group 1121 are both set in the lens barrel 1122, and the rear lens group 1121 constitutes a lens group. The aperture 1123 is located on the light-emitting side of the lens group.

[0158] It should be noted that the lens assembly 110 can project an image beam, which can project an image onto a projection screen for users to watch.

[0159] Rear lens group 1121 is made of a transparent material with two surfaces exhibiting different curvatures, thereby allowing light to be redirected or focused as needed. Rear lens group 1121 can be used in optical instruments, eyeglasses, camera lenses, and the like. A lens is a common type of lens that can focus or disperse light based on its curvature.

[0160] Commonly used lenses in projection are convex and concave lenses. Convex lenses focus parallel light rays onto a single point, known as the focal point. Concave lenses disperse parallel light rays. By using the appropriate type and curvature of the rear lens group 1121, the light in the projector can be adjusted to ensure a clear projected image.

[0161] Aperture 1123 is primarily used to control light propagation and adjust its diameter. It typically consists of a circular or polygonal opening whose size can be adjusted to control the flow of light. Aperture 1123 controls the direction of light propagation and limits its radial distribution, thereby adjusting the size and shape of the beam. It can be used to control light intensity, angle, focus, and dispersion, and can also reduce or eliminate aberrations and scattering in some optical systems.

[0162] In some optical instruments and devices, the aperture 1123 can also be used to limit the propagation of non-main axis light, thereby reducing astigmatism generated at the focal point or imaging plane. Its adjustment is usually controlled by mechanical or electronic means to precisely adjust the light as needed.

[0163] In some examples, the aperture 1123 and the rear lens group barrel 1122, and the rear lens group 1121 and the rear lens group barrel 1122 can be connected by a detachable connection or a fixed connection, such as a bolt, a buckle, or a hanging connection. Specifically, the embodiments of the present application are not too restrictive.

[0164] The aperture 1123 includes a cylindrical aperture body 11231, the aperture body 11231 has a light-through hole 11230, and the axial direction of the aperture body 11231 extends along the light-emitting direction of the lens group. The inner wall of the light-through hole 11230 has at least one recessed area, and the side of the recessed area facing the lens group forms a light-blocking portion 11232.

[0165] In this way, the light-blocking portion 11232 can block part of the light. Since the light emitted from the lens group cannot penetrate the aperture body 11231, when the projection device 100 works for a long time, the aperture body 11231 receives a high amount of heat and the surface in contact with the rear group lens barrel 1122 will quickly accumulate heat and continue to heat up. In order to avoid excessive temperature from damaging the rear group lens barrel 1122, the aperture body 11231 is designed with a light-blocking portion 11232, which can block part of the light and thus block part of the heat.

[0166] Since the aperture body 11231 has at least one light-blocking portion 11232, the energy of the first light-receiving surface can be reduced, and the heat can be evenly distributed to the entire aperture body 11231, thereby effectively solving the problem of overheating at the position of the rear group lens barrel 1122 and the aperture body 11231.

[0167] It should be noted that, through experiments, the temperature of the contact surface between the aperture body 11231 and the rear group barrel 1122 can be reduced by 40°C to 60°C, and the cooling effect is significant.

[0168] In addition, it should be noted that the lens assembly 110 in the projection device 100 provided in the embodiment of the present application can be an ultra-short focus lens, and of course can also be a telephoto lens. Specifically, the embodiment of the present application does not impose too many restrictions here.

[0169] As shown in FIG. 22 , the lens assembly 110 can be used in an ultra-short-throw lens, and a reflector 140 can be added to the projection device 100 to meet the requirements of the ultra-short-throw lens.

[0170] As shown in Figures 22 to 25, in some embodiments, the radial thickness of the aperture body 11231 at the end facing the lens group is greater than the radial thickness at the end facing away from the lens group. It should be noted that the thickness of the aperture body 11231 increases along the axial direction (or the direction of incident light) near the lens group, and this increased thickness can absorb more heat.

[0171] It should be noted that after multiple experiments, regarding the prior art solution, as shown in Figure 19, the temperature at the interface between aperture 0024 and lens barrel 0022 was monitored at 151°C. Due to its small size, energy absorbed by the aperture sheet is concentrated on the aperture itself, making it difficult to dissipate. It is primarily concentrated on the interface between aperture 0024 and lens barrel 0022, causing localized overheating of the lens barrel 0022 and charring of the plastic.

[0172] As shown in Figures 22 to 25, in some embodiments, the diameter of the light hole 11230 at the end facing the lens group is smaller than the diameter at the end facing away from the lens group. As a result, the thickness of the aperture body 11231 increases along the axial direction close to the lens group, and the increased thickness can absorb more heat.

[0173] As shown in Figure 20, the temperature at the interface between the monitoring aperture 0024 and the lens barrel 0022 is 145°C. Increasing the thickness and simultaneously increasing the light-blocking aperture of the aperture 0024 by increasing the thickness of the inner aperture to block light (without any effect) increases the heat dissipation rate due to the increased heat dissipation area, but the temperature remains high and fails to meet the specification requirements.

[0174] As shown in Figure 21, the temperature of the contact surface between the monitoring aperture 0024 and the lens barrel 0022 is 135°C. After increasing the thickness of the aperture 0024, the heat dissipation rate increases due to the increase in the heat dissipation area, but the temperature is still very high and cannot meet the specification requirements.

[0175] As shown in Figures 24 and 25, the projection device 100 provided by the embodiment of the present application monitors the temperature of the contact surface between the aperture body 11231 and the rear group lens barrel 1122 to be 105°C. The reason is that while increasing the thickness of the aperture body 11231, the embodiment increases the position for absorbing heat, thereby reducing the temperature of the contact surface between the aperture body 11231 and the rear group lens barrel 1122, and synchronously realizes the uniform distribution of the heat in the aperture body 11231, and quickly transmits it through the rear group lens barrel 1122.

[0176] Figure 26 is a structural schematic diagram of a lens assembly provided in an embodiment of the present application; Figure 27 is a structural cross-sectional diagram of a lens assembly provided in an embodiment of the present application; Figure 28 is a structural cross-sectional diagram of another lens assembly provided in an embodiment of the present application; Figure 29 is a structural cross-sectional diagram of the exploded state of another lens assembly provided in an embodiment of the present application.

[0177] As shown in Figures 24 to 29, in some embodiments, there are multiple light-blocking portions 11232, which are arranged in sequence along the axial direction of the aperture body 11231. The centers of the light-blocking portions 11232 and the light-through hole 11230 have different distances, and the distance between the centers of the light-blocking portions 11232 and the light-through hole 11230 gradually increases from the side toward the lens group to the side away from the lens group.

[0178] It can be understood that along the emission direction of the lens group, multiple light-blocking parts 11232 are connected and arranged in sequence to block light multiple times and evenly distribute heat to each light-blocking part 11232, so that the temperature of the contact surface with the rear group lens barrel 1122 can be greatly reduced.

[0179] It should be noted that the design of different distances between the centers of each light-blocking portion 11232 and the light-through hole 11230 can more accurately and evenly distribute heat to each light-blocking portion 11232. The distance between the center of each light-blocking portion 11232 and the light-through hole 11230 can be adjusted according to actual conditions and is not subject to excessive restrictions here.

[0180] As shown in Figures 24 to 29, in some embodiments, the recessed area surrounds the inner wall of the light hole 11230 along the circumference of the light hole 11230 to form an annular retaining ring 11233, and the end face of the retaining ring 11233 facing the lens group forms a light-blocking portion 11232, and the inner diameter of the retaining ring 11233 gradually increases along the incident direction of the light.

[0181] It can be understood that, in order to facilitate processing and manufacturing, the recessed area of ​​the aperture body 11231 is a rotating body structure.

[0182] Among them, the part that blocks the light is the light blocking part 11232, which is located on the end face of the retaining ring 11233 facing the lens group, and can expand the diameter of the aperture 1123 to a certain extent, thereby reducing the energy of the first light-receiving surface.

[0183] As shown in FIG24 , in some embodiments, there are at least two retaining rings 11233, and the at least two retaining rings 11233 are adjacently arranged along the axial direction of the aperture body 11231. The retaining ring 11233 has a first retaining edge 112331 facing the lens group and a second retaining edge 112332 facing away from the lens group. Of the two adjacent retaining rings 11233, the first retaining edge 112331 of the preceding retaining ring 11233 and the second retaining edge 112332 of the succeeding retaining ring 11233 are adjacent to each other, and a first angle is formed between the first retaining edge 112331 and the second retaining edge 112332.

[0184] It can be understood that there are multiple retaining rings 11233, and the multiple retaining rings 11233 are connected in sequence, wherein each retaining ring 11233 includes a first retaining edge 112331 and a second retaining edge 112332, and the first retaining edge 112331 is used to block part of the light, which means that the first retaining edge 112331 can block light to reduce the energy of the light-receiving surface, and the corresponding multiple first retaining edges 112331 in the multiple retaining rings 11233 are graded to block light in sequence, and the heat is evenly distributed on the entire aperture body 11231, so that the temperature of the contact surface with the plastic lens barrel 1122 can be greatly reduced.

[0185] In addition, it can be understood that the provision of the second rib 112332 facilitates the connection of two adjacent first ribs 112331, thereby achieving a better light blocking effect and ensuring the integrity of the entire structure.

[0186] It should be noted that the first rib 112331 and the second rib 112332 are integrally formed, which can ensure that the first rib 112331 and the second rib 112332 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 precision requirements can be reduced, and the process of welding the first rib 112331 and the second rib 112332 to each other is omitted, thereby improving assembly efficiency.

[0187] On the other hand, the overall rigidity of the retaining ring 11233 can be improved, and the possibility of loosening between the first retaining edge 112331 and the second retaining edge 112332 can be reduced, and the structural strength is higher.

[0188] It should be noted that, in some embodiments, the first side 112331 and the second side 112332 are connected in an integrated manner, and in other embodiments, the first side 112331 and the second side 112332 can also be connected in other manners. As long as the connection method can fix the first side 112331 and the second side 112332, the purpose of this embodiment can be achieved, and there is no restriction on the connection method of the first side 112331 and the second side 112332.

[0189] As shown in FIG. 24 to FIG. 29 , in some embodiments, at least two first ribs 112331 are parallel to each other; and / or, at least two second ribs 112332 are parallel to each other.

[0190] It should be noted that such a setting is convenient for processing and manufacturing. At the same time, it can evenly block light and evenly distribute heat to the entire aperture body 11231, thereby reducing the temperature of the contact surface between the aperture body 11231 and the plastic lens barrel 1122 and improving the heat dissipation efficiency.

[0191] In some embodiments, the angle between the first rib 112331 and the axial direction of the aperture body 11231 is less than or equal to 90°.

[0192] It should be noted that such a configuration enables the first rib 112331 to better face the lens group to block light.

[0193] FIG30 is a cross-sectional view of the structure of another aperture in the projection device provided in an embodiment of the present application. As shown in FIG30 , the first rib 112331 and the second rib 112332 are perpendicular to each other, wherein the inclined light emitted from the rear lens group 1121 is evenly blocked by the multiple first ribs 112331 to reduce the temperature.

[0194] As shown in Figures 27 and 29, in some embodiments, the lens assembly 110 also includes a connecting unit, which includes a threaded connector (not shown in the figures), a first connecting hole (not shown in the figures) is provided around the aperture body 11231, and a second connecting hole 11223 is provided in the rear group lens barrel 1122. The first connecting hole and the second connecting hole 11223 match each other, and the threaded connector passes through the first connecting hole and the second connecting hole 11223 in sequence to connect the aperture body 11231 and the rear group lens barrel 1122.

[0195] In some embodiments, there can be multiple or one threaded connectors, which can connect the aperture body 11231 and the rear group lens barrel 1122 to ensure the stability of the aperture body 11231 when it is installed on the rear group lens barrel 1122 and avoid looseness between the two.

[0196] It is understood that when there are multiple threaded connectors, the multiple threaded connectors can be spaced apart and arranged on the same side or different sides of the lens barrel 1122 to improve the stability of the connection.

[0197] In some embodiments, the threaded connector can be a threaded connector or other threaded connector, as long as it can ensure that the aperture body 11231 is installed on the rear group barrel 1122, and there are no specific restrictions.

[0198] Of course, it should be noted that in the embodiment of the present application, considering the cost of the threaded connector, the threaded connector can be a threaded fastener. Correspondingly, a first connecting hole is opened on the aperture body 11231, and the first connecting hole can be a threaded hole. The threaded connector can pass through the first connecting hole and can be tightened or loosened to adjust the fixed and disassembled states.

[0199] In addition, correspondingly, a second connecting hole 11223 is opened on the rear group lens barrel 1122, and the second connecting hole 11223 can also be a threaded hole. The threaded connector can pass through the first connecting hole and can be adjusted to a fixed and disassembled state by tightening or loosening.

[0200] Specifically, the threaded connector passes through the first connecting hole and the second connecting hole 11223 in sequence and is tightened, so that the aperture body 11231 can be fixed to the rear group lens barrel 1122. Of course, when the aperture body 11231 needs to be removed, it is only necessary to loosen the threaded connector and then remove the threaded connector from the second connecting hole and the first connecting hole in sequence.

[0201] The projection device provided in the embodiment of the present application includes: a shell; a lens assembly, including a lens and a lens barrel unit, the lens barrel unit including a lens barrel and an aperture, the lens barrel is arranged on the shell, the aperture and the lens are both arranged in the lens barrel, and the lenses constitute a lens group, and the aperture is located on the light-emitting side of the lens group; the aperture includes a cylindrical aperture body, the aperture body has a light-through hole, and the axial direction of the aperture body extends along the light-emitting direction of the lens group, the inner wall of the light-through hole has at least one recessed area, and the side of the recessed area facing the lens group forms a light-blocking portion.

[0202] By designing at least one light-blocking portion and further adopting a graded light-blocking solution, the diameter of the aperture can be expanded to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing heat throughout the aperture body. This can significantly reduce the temperature of the contact surface with the plastic lens barrel. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, it also improves the heat dissipation efficiency, effectively solving the problem of overheating at the plastic lens barrel and the aperture body. At the same time, it avoids degradation of the plastic due to excessive temperature, which can lead to product resolution failure. That is, it will not affect the lens resolution effect, effectively reducing the size of the aperture, making it small and low-cost.

[0203] In addition, as shown in FIG. 22 to FIG. 30 , the embodiment of the present application further provides a projection device 100, including:

[0204] Device housing 150; lens assembly 110, including a rear lens group barrel 1122, a rear lens group 1121 and an aperture 1123. The rear lens group barrel 1122 is disposed on the device housing 150. The aperture 1123 and the rear lens group 1121 are both disposed within the rear lens group barrel 1122. The aperture 1123 is located on the light-emitting side of the rear lens group 1121. The aperture 1123 has a light hole 11230. The radial thickness of the aperture 1123 at the end facing the rear lens group 1121 is greater than the radial thickness at the end facing away from the rear lens group 1121.

[0205] The projection device provided in the embodiment of the present application, through the design of at least one light-blocking portion, further adopts a graded light-blocking scheme to expand the diameter of the aperture to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing the heat to the entire aperture body. The temperature of the contact surface with the plastic lens barrel can be greatly reduced. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, the heat dissipation efficiency is also improved, effectively solving the problem of overheating at the position of the plastic lens barrel and the aperture body; at the same time, it avoids the degradation of the plastic due to excessive temperature, which leads to the failure of product resolution. That is, it does not affect the lens resolution effect, effectively reduces the size of the aperture, is small in size, and has a low cost.

[0206] In addition, an embodiment of the present application further provides a projection system, comprising a projection screen and the aforementioned projection device 100, wherein the projection device 100 is configured to project a projection image onto the projection screen. The projection device 100 may be any of the embodiments shown in FIG. 2 to FIG. 18 , or any of the embodiments shown in FIG. 22 to FIG. 30 .

[0207] The projection screen includes a display film, and the front side of the display film is a projection light receiving surface.

[0208] 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.

[0209] 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.

[0210] To connect and secure the rigid diaphragm, the display diaphragm in this embodiment also includes a soft connecting fabric. This fabric can be bonded to the rigid diaphragm and connected to other fixing structures, thereby securing the diaphragm. The connecting fabric and the diaphragm are bonded to each other, so the degree of stretch of the connecting fabric affects the curling or unfolding of the diaphragm.

[0211] In some embodiments, to achieve connection with the diaphragm body, the connecting fabric is sufficiently large to cover at least the area on the back side of the diaphragm body opposite the front light-receiving area. In this case, the back side 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.

[0212] The projection system provided in this embodiment specifically includes a projection screen and the projection device 100 in the aforementioned embodiment. The projection device 100 is used to project a projection image onto the display film of the projection screen.

[0213] 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.

[0214] 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.

[0215] By designing at least one light-blocking portion and further adopting a graded light-blocking solution, the diameter of the aperture can be expanded to a certain extent, thereby reducing the energy of the first light-receiving surface and evenly distributing heat throughout the aperture body. This can significantly reduce the temperature of the contact surface with the plastic lens barrel. While reducing the temperature of the contact surface between the aperture body and the plastic lens barrel, it also improves the heat dissipation efficiency, effectively solving the problem of overheating at the plastic lens barrel and the aperture body. At the same time, it avoids degradation of the plastic due to excessive temperature, which can lead to product resolution failure. That is, it will not affect the lens resolution effect, effectively reducing the size of the aperture, making it small and low-cost.

[0216] 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, wherein: include: A lens assembly (110), the lens assembly (110) comprising a housing (111) and a rear lens barrel (1122), one end of the rear lens barrel (1122) being located inside the housing (111), and the other end of the rear lens barrel (1122) being located outside the housing (111); A lighting assembly (120), the lighting assembly (120) comprising a lighting housing (121); A thermal balance component (130), the thermal balance component (130) comprising a thermally conductive ring (133), the thermally conductive ring (133) being sleeved with the rear group lens barrel (1122) located outside the housing (111), and the thermally conductive ring (133) being in abutment with the lighting housing (121).

2. The projection device according to claim 1, wherein: The heat-conducting ring (133) comprises a shaft sleeve portion (1333) and a disc-shaped portion (1334); The shaft sleeve portion (1333) is sleeved with the rear lens group barrel (1122), and the inner peripheral wall of the shaft sleeve portion (1333) is connected to the outer peripheral wall of the rear lens group barrel (1122); The disc-shaped portion (1334) is connected to the outer peripheral wall of the shaft sleeve portion (1333), and the disc-shaped portion (1334) faces the first side wall (1331) of the lighting housing (121) and abuts against the lighting housing (121).

3. The projection device according to claim 2, wherein: The second side wall (1332) of the disc-shaped portion (1334) facing away from the lighting housing (121) is aligned with the end surface of the shaft sleeve portion (1333) facing away from the lighting housing (121); or, The first side wall (1331) is aligned with an end surface of the shaft sleeve portion (1333) facing the lighting housing (121).

4. The projection device according to any one of claims 1 to 3, wherein: The rear lens barrel (1122) comprises a mounting portion (11221) adapted to the housing (111); The thermal balance component (130) further comprises a first elastic member (131), the first elastic member (131) being sleeved with the rear group lens barrel (1122) located outside the shell (111); the heat conductive ring (133) further comprises a second side wall (1332) facing away from the lighting shell (121), the first elastic member (131) being abutted between the end surface of the mounting portion (11221) facing the lighting shell (121) and the second side wall (1332), the first elastic member (131) being retractable in the incident direction of light to form a heat conductive connection between the mounting portion (11221) and the lighting shell (121).

5. The projection device according to claim 4, wherein: The distance between the end surface of the mounting portion (11221) and the end surface of the lighting housing (121) is less than or equal to 1 mm; The thickness of the first elastic member (131) is in the range of 0.05 mm to 0.1 mm.

6. The projection device according to claim 4, wherein: The first elastic member (131) comprises a first heat-conducting portion (1311) and a second heat-conducting portion (1312); the first heat-conducting portion (1311) abuts against the end surface of the mounting portion (11221); the second heat-conducting portion (1312) abuts against the second side wall (1332); the first elastic member (131) is used to transfer heat between the rear group lens barrel (1122) and the heat-conducting ring (133).

7. The projection device according to claim 6, wherein: The first elastic member (131) further comprises a telescopic portion (1313), wherein the telescopic portion (1313) is located between the first heat conducting portion (1311) and the second heat conducting portion (1312), and opposite ends of the telescopic portion (1313) are respectively connected to the first heat conducting portion (1311) and the second heat conducting portion (1312).

8. The projection device according to any one of claims 4 to 7, wherein: The first elastic member (131) is in the shape of a circular ring, and when the second side wall (1332) and the end surface of the mounting portion (11221) are pressed against each other, the first elastic member (131) is deformed.

9. The projection device according to any one of claims 1 to 8, wherein: The thermal balance component (130) further comprises a second elastic member (132), wherein the second elastic member (132) is arranged on a flange surface of the housing (111) facing the lighting housing (121), and the second elastic member (132) is used to elastically press the heat conductive ring (133) onto the lighting housing (121).

10. The projection device according to claim 9, wherein: When the thermal balance component (130) comprises a first elastic member (131), the first elastic member (131) is located between the second elastic member (132) and the heat conductive ring (133).

11. The projection device according to claim 9, wherein: The second elastic member (132) is an annular member, and the second elastic member (132) has a bending portion, which is formed around the center of the second elastic member (132), and the distances between different parts of the bending portion and the wall surface of the heat conductive ring (133) are different.

12. The projection device according to any one of claims 1 to 11, wherein: The thermal balance component (130) further comprises a retaining spring (134); a retaining groove (11222) is provided on the rear group lens barrel (1122) outside the housing (111); the retaining spring (134) is retained in the retaining groove (11222) and is used to fix the heat conducting ring (133).

13. The projection device according to any one of claims 1 to 12, wherein: The lens assembly (110) further comprises: A rear lens group (1121) and an aperture (1123), wherein the aperture (1123) and the rear lens group (1121) are both arranged in the rear lens group barrel (1122), and the rear lens group (1121) constitutes a lens group, and the aperture (1123) is located on the light exit side of the lens group; The aperture (1123) includes a cylindrical aperture body (11231), wherein the aperture body (11231) has a light-through hole (11230), and the inner wall of the light-through hole (11230) has at least one recessed area, and a light-blocking portion (11232) is formed on a side of the recessed area facing the lens group.

14. The projection device according to claim 13, wherein: The radial thickness of the aperture body (11231) at one end facing the lens group is greater than the radial thickness at the end facing away from the lens group.

15. The projection device according to claim 13, wherein: The diameter of the light-through hole (11230) at one end facing the lens group is smaller than the diameter at one end facing away from the lens group.

16. The projection device according to claim 14 or 15, wherein: There are multiple light-blocking portions (11232), which are arranged in sequence along the axial direction of the aperture body (11231). The centers of the light-blocking portions (11232) and the light-through hole (11230) have different distances, and the distance between the centers of the light-blocking portions (11232) and the light-through hole (11230) gradually increases from the side toward the lens group to the side away from the lens group.

17. The projection device according to any one of claims 13 to 16, wherein: The recessed area surrounds the inner wall of the light through hole (11230) along the circumference of the light through hole (11230) to form an annular retaining ring (11233), and the end surface of the retaining ring (11233) facing the lens group forms the light blocking portion (11232), and along the incident direction of the light, the inner diameter of the retaining ring (11233) gradually increases.

18. The projection device according to claim 17, wherein: There are at least two retaining rings (11233), and at least two retaining rings (11233) are adjacently arranged along the axial direction of the aperture body (11231); The retaining ring (11233) has a first retaining edge (112331) facing the lens group and a second retaining edge (112332) away from the lens group. In two adjacent retaining rings (11233), the first retaining edge (112331) of the previous retaining ring (11233) and the second retaining edge (112332) of the next retaining ring (11233) are adjacent, and a first angle is formed between the first retaining edge (112331) and the second retaining edge (112332).

19. The projection device according to claim 18, wherein: At least two of the first ribs (112331) are parallel to each other; and / or, At least two of the second ribs (112332) are parallel to each other.

20. The projection device according to claim 18, wherein: The angle between the first retaining edge (112331) and the axial direction of the aperture body (11231) is less than or equal to 90°.

21. The projection device according to any one of claims 13 to 16, wherein: The lens assembly (110) also includes a connection unit, which includes a threaded connection piece. A first connection hole is provided on the periphery of the aperture body (11231), and a second connection hole (11223) is provided on the rear group lens barrel (1122). The first connection hole and the second connection hole (11223) match each other. The threaded connection piece passes through the first connection hole and the second connection hole (11223) in sequence to connect the aperture body (11231) and the rear group lens barrel (1122).

22. A projection system, wherein: The invention comprises a projection screen and the projection device (100) according to any one of claims 1 to 21, wherein the projection device (100) is used for projecting a projection picture onto the projection screen.

Images