Shifted-axis lens and projection device

Abstract

The application relates to the technical field of projection equipment, in particular to a shift lens and a projection device. The shift lens comprises a lens holder, a front shell and a sealing element, the lens is arranged on the holder, the front shell is arranged at a distance from the end surface of the holder facing the front shell, the sealing element is arranged on one of the holder and the front shell, and the sealing element abuts against the other one of the holder and the front shell; the annular abutting surface of the sealing element abutting against the other one of the holder and the front shell has a preset width along the radial direction of the annular abutting surface, and the size of the preset width is 0.8 / 22-2 / 55 of the width size of the cross section of the sealing element along the radial direction. The shift lens makes the contact between the sealing element and the other one of the holder and the front shell similar to linear contact, thereby reducing the abutting force between the sealing element and the holder or the front shell when the sealing element is sealed, further reducing the reaction force of the sealing element on the holder or the front shell, making the lens hardly bear force when moving, and being beneficial to guaranteeing the resolving power of the lens.

Description

Technical Field

[0001] This application relates to the field of projection equipment technology, and in particular to tilt-shift lenses and projection devices. Background Technology

[0002] Currently, projection devices are increasingly widely used in daily life. A projection device is an electronic device that uses optical principles and signal processing technology to convert digital images or video signals output by electronic devices such as computers, mobile phones, and TV boxes into magnified and visualized optical images that can be displayed on two-dimensional planes such as screens, walls, and whiteboards. Its core function is to break through the display limitations of small-screen devices, realize the presentation of large-size, high-visibility images, and meet the needs of multi-person shared viewing, immersive experiences, or professional presentations.

[0003] Specifically, in related technologies, the projection device achieves a wider projection range by shifting the lens, specifically by moving the lens up, down, left, and right. Simultaneously, the lens extends and retracts to adjust the clarity of the displayed image. To ensure the clarity of the lens projection effect, a sealing ring is installed between the lens mounting point and the front housing.

[0004] However, the contact force between the bracket and the front housing and the sealing ring has a large reaction force on the lens translation process, which affects the lens's resolving power. Utility Model Content

[0005] Therefore, it is necessary to provide a tilt-shift lens and projection device to address the problem that the large reaction force between the bracket and the front housing and the sealing ring on the lens translation process affects the lens's resolution.

[0006] A tilt-shift lens, comprising:

[0007] support;

[0008] The lens is mounted on the bracket;

[0009] The front shell is spaced apart from the end face of the bracket facing the front shell;

[0010] A seal is disposed on one of the bracket and the front housing, and the seal abuts against the other of the bracket and the front housing;

[0011] The seal includes an annular abutment surface that abuts against the other of the bracket and the front housing. The annular abutment surface has a predetermined width along the radial direction of the annular abutment surface. The predetermined width is 0.8 / 22-2 / 55 of the radial width of the seal's cross-section.

[0012] The lens of this tilt-shift lens features a sealing element that includes an annular contact surface that abuts against another of the support and front housing. This annular contact surface has a predetermined width along its radial direction, which is 0.8 / 22 to 2 / 55 of the radial width of the seal's cross-section. This design ensures that the contact between the seal and the other of the support and front housing is approximately linear, thereby reducing the contact force between the seal and the support or front housing during sealing. This, in turn, reduces the reaction force exerted by the seal on the support or front housing, resulting in minimal force during lens movement and thus maintaining the lens's resolving power. Furthermore, this sealing element has a simple structure, few components, and low cost.

[0013] In one embodiment, the preset width is 0.1mm-1mm.

[0014] The width of this linear contact is the radial distance D between the inner and outer walls of the contact area. A distance D of 0.1mm-1mm, not exceeding 1mm, helps minimize the sealing reaction force, reduces resistance to lens movement, and ensures the stability of lens translation and the lens's resolving power. Simultaneously, a distance D of 0.1mm-1mm ensures a continuous and stable annular contact zone between the seal and the bracket or front housing. This prevents an excessively large contact area from increasing the seal's reaction force on the bracket, and also avoids partial failure of the seal to contact the bracket or front housing due to manufacturing errors, preventing dust or moisture from seeping in from these areas, thus effectively ensuring a good seal.

[0015] In one embodiment, the seal is annular, and the seal includes:

[0016] Two sealing portions are provided, one of which is located near the geometric center of the seal and the other is located away from the geometric center of the seal. The two sets of sealing portions are symmetrically arranged about a direction parallel to the axis of the seal. Along the axial direction of the seal, one end of the sealing portion is sealed to one of the bracket and the front housing, and the other end abuts against the other of the bracket and the front housing.

[0017] When there is only one sealing part, the single sealing part abuts against the front shell, and the seal is prone to tilting radially to one side due to unilateral force. This may cause slight tilting of the bracket, which in turn may cause lens misalignment inside the lens, and long-term use may cause permanent deformation of the seal. This embodiment sets two sets of mutually symmetrical sealing parts, which generate radial reaction forces of opposite direction and equal magnitude. After they cancel each other out, the overall force on the seal is balanced. The symmetrical design can minimize the radial force on the bracket, avoid image blurring caused by changes in lens spacing, indirectly protect the lens's resolution, and the seal is less prone to tilting or deformation, thus extending its service life.

[0018] In one embodiment, the sealing portion includes:

[0019] The abutting part abuts against one of the bracket and the front shell;

[0020] A connecting sub-part, which connects to the other of the bracket and the front housing;

[0021] The deformable sub-part is located along the axial direction of the lens, with one end connected to the abutment sub-part and the other end connected to the connecting sub-part.

[0022] The lens needs to extend and retract axially and translate radially. The deformable sub-section acts as a flexible bridge connecting the abutment sub-section and the connecting sub-section. Its deformation can compensate for positional deviations during movement, ensuring uninterrupted sealing. Simultaneously, the abutment sub-section abuts against one of the bracket and the front housing; that is, the abutment sub-section is a movable abutment end. It can maintain a certain contact pressure through the elasticity of the deformable sub-section, and can flexibly adjust the contact angle as the lens moves, avoiding restrictions on lens movement due to a fixed connection, thus achieving a seal without locking the position. The connecting sub-section connects to the other of the bracket and the front housing; that is, the connecting sub-section is a fixed connection end, forming a stable reference end, preventing overall displacement of the sealing part, and ensuring that the sealing position does not shift.

[0023] In one embodiment, one end of the deformable sub-part is connected to the end of the abutment sub-part away from the geometric center of the sealing part, and the other end is connected to the end of the connecting sub-part near the geometric center of the sealing part; or, one end of the deformable sub-part is connected to the end of the abutment sub-part near the geometric center of the sealing part, and the other end is connected to the end of the connecting sub-part away from the geometric center of the sealing part.

[0024] When the lens extends or retracts along the axial direction, the change in the axial distance between the bracket and the front housing will cause the deformable sub-section to stretch or compress along the axial line, rather than twisting randomly, making the deformation controllable. When the lens translates radially, the deformable sub-section can rotate slightly around the connection point near the geometric center end to adapt to radial misalignment and avoid bidirectional pulling resistance caused by symmetrical connection. This can further reduce the reaction force of the sealing structure on the lens movement, ensuring smoother lens translation or extension, indirectly reducing the risk of lens tilt and ensuring resolution.

[0025] In one embodiment, when the lens moves axially, the deformation of the deformable sub-part is greater than the deformation of the abutment sub-part and the connecting sub-part.

[0026] This sealing part helps ensure that the first and second abutment surfaces always fit tightly, preventing seal failure. Simultaneously, if the deformation of the first and second abutment surfaces is too large, additional resistance will be generated. In this embodiment, the deformation of the deformable sub-part is greater than that of the abutment sub-part and the connecting sub-part, reducing the resistance to axial movement of the lens. This adapts to axial telescopic focusing, avoiding stuttering or unevenness during axial telescopic movement, and preventing pulling on the internal lens elements that could affect resolution. The deformable sub-part absorbs the axial displacement of the lens through its own deformation, allowing it to bear the main deformation, minimizing axial displacement resistance, ensuring smoother lens telescopic focusing, and not affecting dynamic adjustment accuracy.

[0027] In one embodiment, the deformable sub-part includes:

[0028] The convex surface, along the axial direction of the seal, has one side connected to the abutment portion;

[0029] The concave surface, along the axial direction of the seal, has one side connected to the convex surface and the other side connected to the connecting part;

[0030] Along the radial direction of the seal, the convex surface on the side near the geometric center of the seal bends towards the side near the geometric center, and the concave surface bends away from the geometric center. The convex surface on the side away from the geometric center of the seal bends away from the geometric center, and the concave surface bends towards the side near the geometric center.

[0031] The connection shape of the convex and concave surfaces creates a "swan neck" shape for the seal. This shape serves as a structure to absorb deformation during lens translation, making the deformable part more prone to deformation. This deformable part significantly improves the flexibility of its axial deformation, adapting to a wide range of lens displacements. Simultaneously, when the lens translates radially up, down, left, and right, the curved surfaces of the convex and concave surfaces, which bend in opposite directions on both sides, significantly enhance radial resistance to deformation. This prevents uneven force distribution along the circumference of the seal, which would otherwise result in varying reaction forces on the support, thus ensuring the lens's resolving power.

[0032] In one embodiment, the curvature of the convex surface is less than the curvature of the concave surface.

[0033] When the lens is translated, the deformable sub-part has low resistance to deformation due to its concave surface with small curvature. It can absorb the deformation caused by the lens translation mainly by the deformation caused by the concave deformation, thereby reducing the reaction force of the sealing part on the lens, so that the reaction force of the lens during translation is almost zero.

[0034] In one embodiment, the seal is provided with a pressure relief hole, which is configured to regulate the air pressure inside and outside the seal.

[0035] The pressure relief hole helps to release internal pressure from the seal when the lens moves back and forth, reducing the reaction force caused by pressure.

[0036] In one embodiment, the seal has a connection hole defined on it, and the bracket includes:

[0037] ontology;

[0038] A connecting post is disposed on the end face of the body facing the seal, and the connecting post passes through the connecting hole.

[0039] The connecting holes and connecting posts serve a guiding and positioning function, which helps improve assembly efficiency. Furthermore, during assembly, the seal is first welded to the bracket to ensure a secure seal between the seal and the second contact surface. Simultaneously, the connecting posts are inserted through the connecting holes and then welded in place to enhance the stability of the connection.

[0040] A projection device includes a tilt-shift lens as described above. This projection device helps to reduce the contact force between the seal and the support or front housing during sealing, thereby reducing the reaction force of the seal on the support or front housing, so that the lens is almost unaffected when moving, which helps to ensure the lens's resolving power. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the projection device provided in one embodiment of this application.

[0042] Figure 2 This is an exploded structural diagram of a projection device provided in one embodiment of this application.

[0043] Figure 3 This is a schematic diagram of the structure of a tilt-shift lens provided in one embodiment of this application.

[0044] Figure 4 This is a schematic diagram of the exploded structure of a tilt-shift lens provided in one embodiment of this application.

[0045] Figure 5 This is a schematic diagram of the assembly structure of the bracket, front shell, and seal provided in one embodiment of this application.

[0046] Figure 6 This is a cross-sectional structural diagram of a tilt-shift lens provided in one embodiment of this application.

[0047] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0048] Figure 8 This is a schematic diagram of the structure of a lens that is translated in the left-right direction according to one embodiment of this application.

[0049] Figure 9 This is a schematic diagram of a lens that is translated vertically in one embodiment of this application.

[0050] Figure 10 This is a schematic diagram of the structure of a lens that translates radially along the compression seal in one embodiment of this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] 100 - Bracket; 110 - Body; 120 - Connecting post; 130 - Mounting post;

[0053] 200-lens;

[0054] 300 - Front shell;

[0055] 400 - Seal; 410 - Sealing part; 411 - Abutting part; 412 - Connecting part; 413 - Deformable part; 4131 - Outer convex surface; 4132 - Inner concave surface; 420 - Pressure relief hole; 430 - Connecting hole;

[0056] 500 - Outer shell; 510 - Front shell; 520 - Rear shell; 530 - Lens cover;

[0057] 600-Optical Engine;

[0058] 700-board. Detailed Implementation

[0059] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0060] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0061] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0065] See Figures 1-6 This embodiment provides a projection device. Figure 1 A schematic diagram of the projection device provided in one embodiment of this application is shown. Figure 2 An exploded structural diagram of a projection device provided in one embodiment of this application is shown. Figure 3 A schematic diagram of the structure of the bracket, front shell, seal and lens provided in one embodiment of this application is shown. Figure 4 An exploded view of the bracket, front housing, seal, and lens provided in one embodiment of this application is shown. Figure 5 A schematic diagram of the assembly structure of the bracket, front shell, and seal provided in one embodiment of this application is shown. Figure 6 A cross-sectional structural schematic diagram of a projection device provided in one embodiment of this application is shown.

[0066] like Figures 1 to 6 As shown, this embodiment provides a projection device. The projection device includes a housing 500, which includes a front housing 510 and a rear housing 520, with the rear housing 520 having an accommodating cavity. The front housing 510 is provided with a light-transmitting hole, and the housing 500 also includes a lens protective cover 530, which is disposed on the light-transmitting hole.

[0067] The projection device includes a tilt-shift lens disposed in the rear housing 520. The tilt-shift lens includes a bracket 100 and a lens 200, with the lens 200 disposed on the bracket 100 for fixing the lens 200. Specifically, the bracket 100 includes a body 110 and a plurality of mounting posts 130, which are spaced apart along the axial direction of the body 110. The body 110 defines a through hole through which the lens 200 passes, and the mounting posts 130 are connected to the lens 200 by screws or other fixing structures.

[0068] The projection device also includes an optical engine 600 and a circuit board 700 housed in the rear housing 520. The optical engine 600 and circuit board 700 are connected to the lens 200. The optical engine 600 converts electrical signals into optical images and is the core of the projection device's imaging. The optical engine 600 typically includes optical components and light valves, affecting key image quality parameters such as brightness, contrast, and color reproduction, directly determining the basic quality of the projected image. The optical image generated by the optical engine 600 is projected through the lens 200, completing the process from image formation to magnified projection. The circuit board 700 receives externally input video and image signals, performing decoding, format conversion, and optimization. The circuit board 700 acts as the brain of the projection device, controlling the overall operating logic, including power-on / off, parameter adjustment, and mode switching. During operation, the circuit board 700 sends control signals to the optical engine 600, directing it to complete various actions related to image generation.

[0069] In addition, the tilt-shift lens also includes a front housing 300 and a seal 400. The front housing 300 and the end face of the support 100 facing the front housing 300 are spaced apart. The seal 400 is disposed on one of the support 100 and the front housing 300, and abuts against the other of the support 100 and the front housing 300. By sealing the front housing 300 and the support 100, the projection device achieves complete sealing during the dynamic movement of the lens 200, preventing impurities or dust from entering through the gaps between the front housing 300 and the support 100, thus helping to ensure the cleanliness of the lens 200.

[0070] When the projection device is in operation, the lens 200 and the support 100 can translate radially along the lens 200 to adjust the projection position, enabling the projection device to achieve a wider projection range. At the same time, the lens 200 and the support 100 can translate axially along the lens 200 to adjust the resolution of the lens 200.

[0071] like Figures 2 to 4 As shown, the seal 400 further includes an annular abutment surface that abuts against another of the bracket 100 and the front housing 300. The annular abutment surface has a predetermined width along its radial direction. The dimension d of the predetermined width is 0.8 / 22-2 / 55 of the radial width D of the cross-section of the seal 400. This makes the contact between the seal 400 and the bracket 100 or the front housing 300 similar to a linear contact, thereby reducing the abutment force between the seal 400 and the bracket 100 or the front housing 300 when sealing. This reduces the reaction force of the seal 400 on the bracket 100 or the front housing 300, making the lens 200 almost unaffected by force during movement, which helps to ensure the resolving power of the lens 200. At the same time, the seal 400 has a simple structure, few structural components, and low cost.

[0072] Specifically, since the lens 200 includes at least two parallel and spaced-apart lenses, when the lens 200 moves, if the support 100 is subjected to a large reaction force, it can easily cause changes such as tilting of the lenses inside the lens 200, which in turn causes changes in the distance between the two lenses, affecting the resolving power of the lens 200. In this embodiment, since the contact between the seal 400 and the support 100 or the front housing 300 is similar to a linear contact, the reaction force of the seal 400 on the support 100 or the front housing 300 can be reduced, thereby preventing changes such as tilting of the lenses during the movement of the lens 200, which helps to ensure the resolving power of the lens 200.

[0073] It is worth noting that, since the lens 200 has a cylindrical structure, the seal 400 is an annular structure to ensure that the seal 400 can seal the outer periphery of the lens 200. The seal 400 includes an annular contact surface that abuts against the other of the bracket 100 and the front housing 300. The annular contact surface has a predetermined width d along its radial direction. The predetermined width of the annular contact surface is relatively small, similar to a linear contact. Of course, the shape of the seal 400 is not limited to specific shapes such as a circle or a square ring.

[0074] In this embodiment, the seal 400 is connected to the bracket 100 and abuts against the front housing 300. Of course, in other embodiments, the seal 400 may also be connected to the front housing 300 and abut against the bracket 100.

[0075] In one embodiment, the preset width d is 0.1mm-1mm. This distance d, being 0.1mm-1mm and not exceeding 1mm, helps to minimize the sealing reaction force, reduce the resistance to the movement of the lens 200, and ensure the stability of the lens 200's translation and its resolving power. Simultaneously, a distance d of 0.1mm-1mm helps ensure a continuous and stable annular contact zone between the seal 400 and the bracket 100 or front housing 300. This prevents an excessively large contact area from increasing the reaction force of the seal 400 on the bracket 100, and also avoids partial non-contact between the seal 400 and the bracket 100 or front housing 300 due to manufacturing errors, preventing dust or moisture from seeping in and effectively ensuring a good seal. For example, the preset width d can be any width range such as 0.1mm-0.2mm, 0.2mm-0.3mm, 0.3mm-0.4mm, 0.4mm-0.5mm, 0.5mm-0.6mm, 0.6mm-0.7mm, 0.7mm-0.8mm, 0.8mm-0.9mm, 0.9mm-1mm.

[0076] For example, the seal 400 is made of a material with a certain degree of elasticity, such as rubber, to ensure the sealing and deformation capabilities of the seal 400.

[0077] Preferably, the preset width d is 0.2mm-0.8mm.

[0078] like Figure 4 and Figure 5 As shown, in one embodiment, the seal 400 is annular and includes two sealing portions 410. One sealing portion 410 is located near the geometric center of the seal 400, and the other sealing portion 410 is located away from the geometric center of the seal 420. The two sets of sealing portions 410 are symmetrically arranged about a direction parallel to the axial direction of the seal 400. Along the axial direction of the seal 400, one end of the sealing portion 410 is sealed to one of the bracket 100 and the front shell 300, and the other end abuts against the other of the bracket 100 and the front shell 300.

[0079] In addition, a deformable cavity is formed between the two sealing parts 410 to buffer the shrinkage caused by the movement of the lens 200, thereby avoiding interference with the movement of the lens 200 or increasing the reaction force.

[0080] In this embodiment, two sets of sealing parts 410 are symmetrically arranged about a direction parallel to the axis of the sealing member 400. The two sets of sealing parts 410 will generate radial reaction forces of opposite directions and equal magnitudes. After they cancel each other out, the sealing member 400 is in overall force balance. The symmetrical design can minimize the radial force borne by the bracket 100, avoid image blurring caused by changes in lens spacing, indirectly ensure the resolution of the lens 200, and the sealing member 400 is not prone to tilting or deformation, thus extending its service life.

[0081] Please continue reading Figure 4 and Figure 5In one embodiment, the sealing portion 410 includes an abutment portion 411, a connecting portion 412, and a deformable portion 413. The abutment portion 411 abuts against one of the bracket 100 and the front housing 300, and the connecting portion 412 connects to the other of the bracket 100 and the front housing 300. Along the axial direction of the lens 200, one end of the deformable portion 413 is connected to the abutment portion 411, and the other end is connected to the connecting portion 412. Since the lens 200 needs to extend and retract axially and translate radially, the deformable portion 413, acting as a flexible bridge connecting the abutment portion 411 and the connecting portion 412, can compensate for positional deviations during movement through its own deformation, ensuring uninterrupted sealing. Simultaneously, the abutting part 411 abuts against one of the bracket 100 and the front shell 300, meaning the abutting part 411 is a movable abutting end. It can maintain a certain fitting pressure through the elasticity of the deformable part 413, and can flexibly adjust the fitting angle as the lens 200 moves, avoiding restrictions on the movement of the lens 200 due to a fixed connection, thus achieving a seal without locking the position. The connecting part 412 connects to the other of the bracket 100 and the front shell 300, meaning the connecting part 412 is a fixed connecting end. It can form a stable reference end, preventing the sealing part 410 from shifting as a whole and ensuring that the sealing position does not deviate.

[0082] When the seal 400 is connected to the bracket 100 and makes linear contact with the front housing 300, the contact sub-part 411 abuts against the front housing 300, and the connecting sub-part 412 is connected to the bracket 100.

[0083] More specifically, one end of the deformable sub-part 413 is connected to the end of the abutment sub-part 411 away from the geometric center of the sealing part 410, and the other end is connected to the end of the connecting sub-part 412 near the geometric center of the sealing part 410; or, one end of the deformable sub-part 413 is connected to the end of the abutment sub-part 411 near the geometric center of the sealing part 410, and the other end is connected to the end of the connecting sub-part 412 away from the geometric center of the sealing part 410. Specifically, along the side of the sealing part 410 radially away from the geometric center of the seal 400, one end of the deformable sub-part 413 is connected to the end of the abutment sub-part 411 away from the geometric center of the sealing part 410, and the other end is connected to the end of the connecting sub-part 412 near the geometric center of the sealing part 410. Along the radial direction of the seal 400, on the side closer to the geometric center, one end of the deformable sub-part 413 is connected to the end of the abutting sub-part 411 near the geometric center of the seal 410, and the other end is connected to the end of the connecting sub-part 412 away from the geometric center of the seal 410.

[0084] When the lens 200 extends or retracts axially, the change in the axial distance between the bracket 100 and the front housing 300 will cause the deformable sub-part 413 to stretch or compress along the axial connection direction, rather than to twist randomly, and the deformation will be controllable. When the lens 200 translates radially, the deformable sub-part 413 can rotate slightly around the connection point near the geometric center end to adapt to radial misalignment and avoid bidirectional pulling resistance caused by symmetrical connection. This can further reduce the reaction force of the sealing structure on the movement of the lens 200, ensure smoother translation or extension of the lens 200, indirectly reduce the risk of lens tilt, and ensure resolution.

[0085] Furthermore, when the lens 200 moves axially, the deformation of the deformable sub-part 413 is greater than that of the abutting sub-part 411 and the connecting sub-part 412. This sealing part 410 helps ensure that the first abutting surface and the second abutting surface are always tightly fitted, avoiding seal failure. At the same time, if the deformation of the first abutting surface and the second abutting surface is too large, additional resistance will be generated. In this embodiment, by making the deformation of the deformable sub-part 413 greater than that of the abutting sub-part 411 and the connecting sub-part 412, the resistance to the axial movement of the lens 200 is reduced, which is suitable for the axial telescopic focusing of the lens 200 and avoids the lens 200 from being stuck or not smooth when telescopically extending or retracting along the axial direction. It also avoids pulling on the lens elements inside the lens 200, which would affect the resolution. It is beneficial for the deformable sub-part 413 to absorb the displacement of the lens 200 along the axial direction through its own deformation, so that the deformable sub-part 413 bears the main deformation, which can minimize the resistance to axial displacement and ensure smoother telescopic focusing of the lens 200 without affecting the dynamic adjustment accuracy.

[0086] like Figure 5As shown, in one embodiment, the deformable sub-part 413 includes a convex surface 4131 and a concave surface 4132. Along the axial direction of the seal 400, one side of the convex surface 4131 connects to the abutment sub-part 411. Along the axial direction of the seal 400, one side of the concave surface 4132 connects to the convex surface 4131, and the other side connects to the connecting sub-part 412. Along the radial direction of the seal 400, the convex surface 4131 near the geometric center of the seal 400 bends towards the side closer to the geometric center, and the concave surface 4132 bends away from the geometric center. The convex surface 4131 away from the geometric center of the seal 400 bends away from the geometric center, and the concave surface 4132 bends towards the side closer to the geometric center. The connection shape of the convex surface 4131 and the concave surface 4132 forms a "swan neck" shape for the seal. This shape serves as a structure to absorb deformation during the translation process of the lens 200, making the deformable sub-part 413 easier to deform. The deformable sub-section 413 significantly improves the flexibility of its axial deformation, adapting to a wide range of lens displacement. Simultaneously, when the lens 200 translates radially up, down, left, and right, the deformable sub-section 413, through the surface constraints of its outwardly convex surface 4131 and inwardly concave surface 4132 (both sides bent in opposite directions), significantly enhances its radial resistance to deformation. This prevents uneven force distribution along the circumference of the seal 400, which would otherwise result in varying reaction forces on the support 100, thus ensuring the resolving power of the lens 200.

[0087] The curvature of the convex surface 4131 is less than that of the concave surface 4132. When the lens 200 is translated, the deformable sub-part 413 has a lower resistance to deformation due to the smaller curvature of the concave surface 4132. It can absorb the deformation caused by the translation of the lens 200 mainly by the deformation caused by the concave deformation, thereby reducing the reaction force of the sealing part 410 on the lens 200, so that the reaction force of the lens 200 during translation is almost zero.

[0088] like Figure 2 As shown, in one embodiment, the seal 400 is provided with a pressure relief hole 420, which is configured to regulate the air pressure inside and outside the seal 400. The pressure relief hole 420 facilitates the release of internal pressure from the seal 400 when the lens 200 moves back and forth, reducing the reaction force caused by the pressure.

[0089] Furthermore, there are multiple pressure relief holes 420, which are divided into two groups. One group is located on the sealing portion 410 near the geometric center of the seal 400, and the other group is located on the sealing portion 410 away from the geometric center of the seal 400. Each group has multiple pressure relief holes 420, which are spaced apart circumferentially along the sealing portion 410 to balance the pressure along the circumference of the seal 400.

[0090] Furthermore, the concave surface 4132 is located inside the deformable sub-part 413, making it easier to deform under pressure during the deformation process. The pressure relief hole 420 is provided on the convex surface 4131, thereby reducing the deformation of the pressure relief hole 420 when the sealing part 410 deforms, thus ensuring the pressure regulating effect of the pressure relief hole 420.

[0091] like Figures 2 to 5 As shown, in one embodiment, the seal 400 defines a connection hole 430, and the bracket 100 includes a connecting post 120 disposed on the end face of the body 110 facing the seal 400. The connecting post 120 passes through the connection hole 430. The connection hole 430 and the connecting post 120 structure have guiding and positioning functions, which helps to improve assembly efficiency. In addition, during assembly, the seal 400 is first welded to the bracket 100 to ensure that the seal 400 is sealed and fixedly connected to the second contact surface in direct contact. At the same time, the connecting post 120 is welded and fixed after passing through the connection hole 430 to improve the stability of the connection.

[0092] Furthermore, the connecting column 120 is a thermofusion column. When welding is required for fixing, the connecting column 120 can be welded by heating at the thermofusion column. Its function is to thermofusion connect with the sealing element 400 to ensure connection reliability and improve efficiency.

[0093] like Figure 7 and Figure 8 As shown, during use, when the lens 200 is moved horizontally, the cross-section of the seal 400 along the BB direction shifts to one side. This causes one deformable portion 413 of the seal 400 along the BB direction to shift towards the geometric center of the seal 400, while the other deformable portion 413 shifts away from the geometric center of the seal 400. The deformable portion 413 shows almost no deformation along the AA direction of the seal 400.

[0094] like Figure 7 and Figure 9 When the lens 200 moves horizontally, the cross-section of the seal 400 along the BB direction shifts to one side. This causes one deformable portion 413 of the seal 400 along the AA direction to shift towards the geometric center of the seal 400, while the other deformable portion 413 shifts away from the geometric center of the seal 400. The deformable portion 413 shows almost no deformation along the BB direction of the seal 400.

[0095] like Figure 7 and Figure 10 When the lens 200 approaches the front housing 300 along the axial direction, the seal 400 is compressed by the lens 200 and deforms, causing the deformed part 413 to be compressed.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A tilt-shift lens, characterized in that, include: Bracket (100); A lens (200) is mounted on the bracket (100); The front shell (300) is spaced apart from the end face of the bracket (100) facing the front shell (300); A seal (400) is disposed on one of the bracket (100) and the front housing (300), and the seal (400) abuts against the other of the bracket (100) and the front housing (300); The seal (400) includes an annular abutment surface that abuts against the other of the bracket (100) and the front shell (300), the annular abutment surface having a preset width along the radial direction of the annular abutment surface, the preset width being 0.8 / 22-2 / 55 of the radial width dimension of the cross section of the seal (400).

2. The tilt-shift lens according to claim 1, characterized in that, The seal (400) is annular, and the seal (400) includes: Two sealing portions (410) are provided, one of which is located near the geometric center of the seal (400) and the other is located away from the geometric center of the seal (400). The two sets of sealing portions (410) are symmetrically arranged about a direction parallel to the axis of the seal (400). Along the axial direction of the seal (400), one end of the sealing portion (410) is sealed to one of the bracket (100) and the front shell (300), and the other end abuts against the other of the bracket (100) and the front shell (300).

3. The tilt-shift lens according to claim 2, characterized in that, The sealing part (410) includes: The abutting part (411) abuts against one of the bracket (100) and the front shell (300); The connecting sub-part (412) is connected to the other of the bracket (100) and the front shell (300); The deformable sub-part (413) is located along the axial direction of the lens (200). One end of the deformable sub-part (413) is connected to the abutment sub-part (411), and the other end is connected to the connection sub-part (412).

4. The tilt-shift lens according to claim 3, characterized in that, One end of the deformable sub-part (413) is connected to the end of the abutting sub-part (411) away from the geometric center of the sealing part (410), and the other end is connected to the end of the connecting sub-part (412) near the geometric center of the sealing part (410); or, one end of the deformable sub-part (413) is connected to the end of the abutting sub-part (411) near the geometric center of the sealing part (410), and the other end is connected to the end of the connecting sub-part (412) away from the geometric center of the sealing part (410).

5. The tilt-shift lens according to claim 3, characterized in that, When the lens (200) moves along the axial direction, the deformation amount of the deformable sub-part (413) is greater than the deformation amount of the abutting sub-part (411) and the connecting sub-part (412).

6. The tilt-shift lens according to claim 5, characterized in that, The deformable sub-part (413) includes: The outer convex surface (4131) is connected to the abutment part (411) on one side along the axial direction of the seal (400). The concave surface (4132) is connected to the convex surface (4131) on one side along the axial direction of the seal (400), and the other side is connected to the connecting sub-part (412). Along the radial direction of the seal (400), the convex surface (4131) on the side near the geometric center of the seal (400) bends toward the side near the geometric center, and the concave surface (4132) bends away from the geometric center.

7. The tilt-shift lens according to claim 6, characterized in that, The curvature of the convex surface (4131) is less than the curvature of the concave surface (4132).

8. The tilt-shift lens according to any one of claims 1-7, characterized in that, The seal (400) is provided with a pressure relief hole (420), which is configured to regulate the air pressure inside and outside the seal (400).

9. The tilt-shift lens according to any one of claims 1-7, characterized in that, The seal (400) has a connection hole (430), and the bracket (100) includes: Ontology(110); A connecting post (120) is disposed on the end face of the body (110) facing the seal (400), and the connecting post (120) passes through the connecting hole (430).

10. A projection device, characterized in that, Including the tilt-shift lens as described in any one of claims 1-9.

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