Projection device
By designing a movable connection between the first and second supports in the projection device, combined with annular protrusions and grooves, guide parts and connecting parts, the resistance problem of the lens during radial movement is solved, achieving low-resistance movement and high sealing performance, thereby improving the lens's service life and image quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO HISENSE LASER DISPLAY CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-05-29
AI Technical Summary
In existing projection equipment, the lens experiences significant resistance from the foam during radial movement, affecting the tilt-shift and focusing processes, and may even lead to lens damage.
By introducing a movable connection between the first and second supports in the projection device, the second support can move radially and/or axially. Combined with the design of annular protrusions and grooves, guides and connecting parts, the resistance to lens movement is reduced and the seal is maintained.
It effectively reduces the resistance to lens movement, minimizes the impact on tilt-shift and focusing processes, and improves lens lifespan and image clarity.
Smart Images
Figure CN224304012U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of projection technology, and in particular to a projection device. Background Technology
[0002] Projection equipment is a multifunctional display device that provides users with a large-screen, high-quality visual experience through optical technology and multimedia functions.
[0003] Projection devices typically consist of a housing and a lens assembly. A gap exists between the housing and the lens assembly. To reduce dust intrusion and maintain image clarity, a ring of foam is installed in this gap to provide dust protection.
[0004] However, when the lens assembly moves radially, the foam will exert significant resistance on the lens assembly. The force of the foam on the lens will affect the movement of the lens, which in turn will affect the tilt-shift and focusing processes, and may even cause damage to the lens. Utility Model Content
[0005] This application provides a projection device. It solves the problem in the prior art where radially movable lenses experience significant resistance from foam. The technical solution is as follows:
[0006] A projection device is provided, comprising: a housing, a projector body, a first bracket, and a second bracket;
[0007] The outer shell has a receiving cavity and a light-emitting hole communicating with the receiving cavity;
[0008] The projector body is connected to the outer shell within the receiving cavity. The projector body has a projection lens, and the light-emitting side of the projection lens faces the light-emitting hole.
[0009] The first bracket is fixedly connected to the outer shell at the light outlet;
[0010] The second bracket is movably connected to the first bracket, and the side of the second bracket facing away from the first bracket is connected to the light-emitting side of the projection lens;
[0011] During the movement of the projection lens relative to the housing, the second bracket is displaced relative to the first bracket in the radial and / or axial direction of the light outlet hole.
[0012] Optionally, one of the first bracket and the second bracket has an annular protrusion, and the other of the first bracket and the second bracket has an annular groove; at least a portion of the annular protrusion is located within the annular groove;
[0013] The width of the annular protrusion is smaller than the width of the annular groove.
[0014] Optionally, the first bracket includes: a first annular frame and at least two limiting portions, the at least two limiting portions being arranged circumferentially around the first annular frame and both being fixedly connected to the first annular frame; the first annular frame has the annular protrusion;
[0015] The second support includes: a second annular frame having the annular groove;
[0016] The limiting part has a limiting protrusion at the end opposite to the first annular frame, and the limiting protrusion is located on the side of the second annular frame opposite to the first annular frame; in the axial direction of the light outlet hole, the distance between the limiting protrusion and the annular protrusion is greater than the distance between the side of the second annular frame opposite to the first annular frame and the bottom of the annular groove.
[0017] Optionally, the first bracket further includes: at least two first guide portions, which are arranged at intervals along the circumference of the first annular frame and are fixedly connected to the first annular frame;
[0018] The second bracket further includes at least two second guide portions, which are arranged at intervals along the circumference of the second annular frame and are fixedly connected to the second annular frame.
[0019] The at least two first guide portions and the at least two second guide portions extend along the axial direction of the light-emitting aperture. The at least two first guide portions and the at least two second guide portions correspond one-to-one, and each first guide portion cooperates with the corresponding second guide portion.
[0020] Optionally, one of the first guide portion and the second guide portion is a guide post, and the other is a guide cylinder; at least a portion of the guide post is located inside the guide cylinder;
[0021] The inner diameter of the guide cylinder is larger than the outer diameter of the guide post.
[0022] Optionally, the first bracket further includes: at least two first connecting portions, which are arranged at intervals along the circumference of the first annular frame and are all fixedly connected to the first annular frame;
[0023] The second bracket further includes: at least two second connecting parts, which are arranged at intervals along the circumference of the second annular frame and are fixedly connected to the second annular frame;
[0024] The at least two first connecting parts and the at least two second connecting parts correspond one-to-one, and each first connecting part is elastically connected to the corresponding second connecting part.
[0025] Optionally, the first connecting portion has a first blind hole, and the second connecting portion has a second blind hole; the axial direction of the first blind hole and the axial direction of the second blind hole are both parallel to the axial direction of the light-emitting hole;
[0026] At least a portion of the first connecting portion is located within the second blind hole, and the outer diameter of the first connecting portion is smaller than the inner diameter of the second blind hole; an elastic element is sandwiched between the first blind hole and the second blind hole.
[0027] Optionally, the at least two first limiting portions, the at least two first guiding portions, and the at least two first connecting portions are arranged alternately in the circumferential direction of the first annular frame.
[0028] Optionally, the projection device further includes: an elastic sealing ring, which is sandwiched between the bottom of the annular protrusion and the annular groove, and is respectively connected to the bottom of the annular protrusion and the annular groove.
[0029] Optionally, the second bracket has a lubrication part on the side facing the projection lens, and the light-emitting side of the projection lens slides in contact with the lubrication part.
[0030] The beneficial effects of the technical solutions provided in this application include at least the following:
[0031] A first bracket and a second bracket are movably connected between the light-emitting hole of the housing and the light-emitting side of the projection lens, allowing the second bracket to move radially and / or axially following the projection lens. This movement of the second bracket relative to the first bracket with the projection lens significantly reduces the resistance to lens movement and minimizes the impact on the lens's tilt-shift and focusing processes. Attached Figure Description
[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 This is a schematic diagram of the dustproof structure of projection equipment in related technologies;
[0034] Figure 2 This is a schematic diagram of a projection device that uses a tilt-shift lens;
[0035] Figure 3 This is a front view of a projection device provided in an embodiment of this application;
[0036] Figure 4This is a right view of a projection device provided in an embodiment of this application;
[0037] Figure 5 yes Figure 4 Enlarged view of the structure at point A in the middle;
[0038] Figure 6 yes Figure 4 Exploded view of a projection device;
[0039] Figure 7 This is a schematic diagram of the structure of the outer shell and the first bracket at the location of the light-emitting hole in the embodiment of this application;
[0040] Figure 8 This is a schematic diagram of the structure of the outer shell and the light-transmitting lens at the location of the light-emitting hole in an embodiment of this application;
[0041] Figure 9 This is a schematic diagram of the structure after the first and second supports are movably connected in an embodiment of this application;
[0042] Figure 10 yes Figure 9 Exploded view of the structure shown;
[0043] Figure 11 It is a plan view in which the light-emitting side of the projection lens, the second bracket, and the first bracket are in a coaxial state;
[0044] Figure 12 yes Figure 11 A cross-sectional view of the structure shown at BB;
[0045] Figure 13 yes Figure 11 A cross-sectional view of the structure shown at CC;
[0046] Figure 14 This is a schematic diagram showing the projection lens being off-center relative to the light output aperture;
[0047] Figure 15 Compared to Figure 12 After axial focusing Figure 11 A cross-sectional view of the structure shown at BB;
[0048] Figure 16 Compared to Figure 13 After axial focusing Figure 11 A cross-sectional view of the structure shown at CC;
[0049] Figure 17 yes Figure 11 A plan view of the structure shown after radial axis shift;
[0050] Figure 18 yes Figure 17 The structure shown is a cross-sectional view at DD.
[0051] Figure 19 yes Figure 17 The structure shown is a cross-sectional view at EE. Detailed Implementation
[0052] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0053] Projection devices typically consist of a housing and a projection lens. A light-emitting aperture is located on the housing, and the projection lens is mounted inside the housing with its light-emitting side facing the aperture. A light-transmitting lens is fixed to the side of the housing away from the light-emitting aperture. This creates a relatively sealed space through the housing, projection lens, and light-transmitting lens, preventing dust from accumulating on the lens and thus maintaining image clarity.
[0054] However, dust can easily accumulate in the sealed space of a projection lens. For example, when the fan draws in air, it carries dust through the vents into the sealed space inside the housing. Alternatively, gaps in the lens assembly can cause dust to adhere. Or, at the seams of the housing, aging or loosening of the sealing material can create gaps, allowing dust to enter the sealed space.
[0055] Dust prevention in the enclosed space of a projection device is mainly achieved through a sealed structure. For example, rubber or silicone gaskets are placed between the lens and the housing to physically block dust. Alternatively, a labyrinthine structure is used to prevent dust from entering the sealed space through a circuitous path.
[0056] Currently, the lenses used in projection devices are ordinary telephoto lenses or zoom lenses. During the focusing process, the lens will move, but mainly it moves back and forth (corresponding to the lens axis).
[0057] Figure 1 This is a schematic diagram of a dustproof structure for projection equipment in related technologies. For lenses that move back and forth, dustproof solutions for projection equipment can be found by referring to... Figure 1 A gap is reserved between the projection lens 2 and the outer casing 1. A ring of foam 3 is added to the end face of the projection lens 2 near the outer casing 1 and kept in a slightly compressed state. The amount of compression needs to be reserved in advance according to the actual situation. The focusing process of the projection lens 2 will have front and back (corresponding) Figure 1 The movement (indicated by the middle arrow in the left and right directions) and the forward and backward movement of the foam 3 will be compressed or released, but the foam 3 will always be in a compressed state, which will play a sealing role. This will reduce the amount of dust intrusion between the light-transmitting lens 4 and the projection lens 2 fixed at the light outlet on the outer shell 1, thus playing a dustproof role and keeping the light-transmitting lens 4 and the projection lens 2 clean, thereby ensuring the clarity of the picture.
[0058] Tilt-shift lenses, as a new type of lens, can move both axially and radially. Due to their advantages such as optimized optical performance, dynamic focal plane control, and intelligent system integration with AI adaptive adjustment, they are being used in projection devices.
[0059] Among these, optical performance optimization refers to: achieving non-destructive adjustment of the projected image position through horizontal / vertical optical axis shifting (Shift) function, avoiding trapezoidal distortion caused by projection angle. Dynamic focal plane control refers to: adjusting the lens tilt angle (Tilt) based on Scheimpflug Principle to expand the depth of field and ensure full-area clarity on complex curved surfaces or tilted projection surfaces (similar to structured light calibration in industrial inspection). Intelligent system integration with AI adaptive adjustment refers to: potentially incorporating corresponding AI algorithms to automatically match tilt-shift parameters through ambient light sensors and image recognition, achieving one-click image correction and color optimization.
[0060] Figure 2 This is a schematic diagram of a projection device that uses a tilt-shift lens. The focusing process of the projection lens 2 in this device involves front and rear (corresponding) movements. Figure 2 The movement (in the left and right directions indicated by the middle arrow) will cause axial (corresponding) movement during the axis shifting process. Figure 2 The movement is indicated by the up and down direction (indicated by the middle arrow).
[0061] If foam 3 is used for dust prevention, and a ring of foam 3 is added to the end face of the projection lens 2 near the outer shell 1 and kept in a slightly compressed state, thereby forming a sealed space 5 between the light-transmitting lens 4 and the projection lens 2, then foam 3 will inevitably affect the movement of the lens. For example, during the radial tilt-shifting or axial focusing process of the tilt-shifting lens, the force of foam 3 on the lens will affect the movement of the lens, thus affecting the tilt-shifting and focusing process, and even causing damage to the lens.
[0062] Conventional foam cannot seal the space between the projection lens and the housing. Because the housing is an enclosed space, there is a certain gap between the projection lens and the housing, and dust generated by the internal fan can easily accumulate on the projection lens, affecting the image display.
[0063] To achieve dust prevention, normal tilt-shift and focusing, and improved lens lifespan and focusing quality in projection devices, this application provides a projection device as follows:
[0064] Figure 3 This is a front view of a projection device provided in an embodiment of this application. Figure 4 This is a right view of a projection device provided in an embodiment of this application. Figure 5 yes Figure 4 Enlarged view of the structure at point A in the middle. Figure 6 yes Figure 4 An exploded view of a projection device. Please refer to the diagram. Figures 3-6 This application provides a projection device 100, including: a housing 101, a projector body 104, a first bracket 200, and a second bracket 300.
[0065] The housing 101 has a receiving cavity and a light-emitting aperture 103 communicating with the receiving cavity. The light-emitting aperture 103 is used to guide the light beam.
[0066] The projector body 104 is connected to the housing 101 within the receiving cavity. The projector body 104 has a projection lens 102, with the light-emitting side 105 of the projection lens 102 facing the light-emitting aperture 103. In this way, the light beam projected by the projection lens 102 can be projected from the light-emitting aperture 103 to the outside of the housing 101.
[0067] The first bracket 200 is fixedly connected to the outer casing 101 at the light exit hole 103. The second bracket 300 is movably connected to the first bracket 200, and the side of the second bracket 300 facing away from the first bracket 200 is connected to the light exit side 105 of the projection lens 102. In this way, the projection lens 102 achieves a movable connection with the outer casing 101 through the second bracket 300 and the first bracket 200 in sequence.
[0068] During the movement of the projection lens 102 relative to the housing 101, the second bracket 300 is displaced relative to the first bracket 200 in the radial and / or axial direction of the light outlet 103.
[0069] It is understood that the projection lens 102 in the projection device 100 may move only radially, only axially, or both radially and axially simultaneously; this application does not impose any limitations on this. The projection lens 102 in the projection device 100 of this application is, for example, a tilt-shift lens as described above. Correspondingly, the second support 300 relative to the first support 200 may also move only radially, only axially, or both radially and axially simultaneously.
[0070] In summary, by movably connecting the first and second brackets at the location of the light-emitting aperture on the housing and the light-emitting side of the projection lens, the second bracket can move radially and / or axially following the projection lens. This movement of the second bracket relative to the first bracket with the projection lens significantly reduces the resistance to lens movement and minimizes the impact on the lens's tilt-shifting and focusing processes.
[0071] In one feasible implementation, the projector body 104 may include a light source device, an optical engine device, and a projection lens 102. Here, the light source device is used to provide an illumination beam, the optical engine device is used to generate an image beam based on the illumination beam provided by the light source device, and guide the image beam to the projection lens 102. The projection lens 102 is used to image the image beam after receiving it and project it onto a projection screen to display an image on the projection screen.
[0072] The light source device, the optical engine device, and the projection lens 102 all include housings. The housing of the light source device can be connected to the housing of the optical engine device, and the housing of the optical engine device can also be connected to the housing of the projection lens 102. In this way, by connecting the housings in the light source device, the optical engine device, and the projection lens 102, the light source device, the optical engine device, and the projection lens 102 can be assembled into the projector body 104.
[0073] like Figure 5 As shown, in some embodiments, the housing 101, the first support 200, the second support 300, and the light-emitting side 105 of the projection lens 102 together form a sealed space. This ensures the airtightness between the housing 101 and the projection lens 102, thus protecting the projection lens 102 from dust, and also reduces resistance to the movement of the projection lens 102. Here, the light-emitting hole 103 of the housing 101 has a light-transmitting lens 400, which seals the light-emitting hole 103.
[0074] The connection between the light-emitting side 105 of the projection lens 102 and the second bracket 300 can be a fixed connection or a movable connection. In some embodiments, the light-emitting side 105 of the projection lens 102 abuts against the side of the second bracket 300 opposite to the first bracket 200, and can slide relative to the second bracket 300 in the radial direction. Figure 5 and Figure 6 As shown, by way of example, the light-emitting side 105 of the projection lens 102 has a lens front cover, which abuts against the second bracket 300 in the axial direction of the light-emitting hole 103 and slides in contact with the second bracket 300.
[0075] Optionally, the second bracket 300 has a lubrication portion on the side facing the projection lens 102, and the light-emitting side 105 of the projection lens 102 slides in contact with the lubrication portion. This significantly reduces the friction at the contact point between the light-emitting side 105 of the projection lens 102 and the second bracket 300, greatly reducing the radial movement resistance of the second bracket 300 to the projection lens 102, allowing the light-emitting side 105 of the projection lens 102 to move freely radially relative to the second bracket 300. Combined with the radial relative movement characteristics of the first bracket 200 and the second bracket 300, the radial movement resistance of the projection lens 102 is further reduced.
[0076] like Figure 5 and Figure 6 As shown, in some embodiments, the projection device 100 further includes a lens cover 106, which is snapped onto the front cover of the lens. The lens cover 106 is located inside the second bracket 300 and covers part of the edge of the second bracket 300.
[0077] Figure 7 This is a schematic diagram of the structure of the outer shell 101 and the first bracket 200 at the location of the light-emitting hole 103 in this embodiment of the application. Figure 7 As shown, the first bracket 200 has a plurality of first fastening portions 201 along the circumferential direction. First fasteners pass through the first fastening portions 201 to fix the first bracket 200 to the inner side of the housing 101. The first fasteners can be screws, and the first fastening portions 201 can be holes, ensuring reliable fixing and convenient assembly and disassembly. In some embodiments, the first fasteners and second fasteners correspond one-to-one, with three of each.
[0078] Figure 8 This is a schematic diagram of the structure of the outer shell 101 and the light-transmitting lens 400 at the location of the light-emitting aperture 103 in this embodiment of the application. Figure 8 As shown, the light-transmitting lens 400 is fixed to the outside of the housing 101 to avoid interference with the first bracket 200. Exemplarily, the light-transmitting lens 400 can be adhered to the lens retaining ring 401. The housing 101 has a second fastening part 402 corresponding to the second fastener, and the lens retaining ring 401 is fixedly connected to the housing 101 by the second fastener (such as a screw). A lens sealing ring 403 (such as foam) is also sandwiched between the light-transmitting lens 400 and the lens retaining ring 401 to ensure sealing. The light-transmitting lens 400 and the lens retaining ring 401 are positioned relative to each other by their shapes, such as an ellipse or a limiting notch 404.
[0079] Figure 9 This is a schematic diagram of the structure after the first support 200 and the second support 300 are movably connected in an embodiment of this application; Figure 10 yes Figure 9 Exploded view of the structure shown; Figure 11 This is a plan view of the light-emitting side 105 of the projection lens 102, the second bracket 300, and the first bracket 200 in a coaxial state. Figure 12 yes Figure 11 A cross-sectional view of the structure shown at BB; Figure 13 yes Figure 11 The structure shown is a cross-sectional view at CC.
[0080] like Figures 9-13As shown, optionally, one of the first support 200 and the second support 300 has an annular protrusion 202, and the other of the first support 200 and the second support 300 has an annular groove 301; at least a portion of the annular protrusion 202 is located within the annular groove 301. The width of the annular protrusion 202 is smaller than the width of the annular groove 301. In some embodiments, the axial directions of both the annular protrusion 202 and the annular groove 301 can be parallel to the axial direction of the light-emitting aperture 103.
[0081] In this way, the annular protrusion 202 and the annular groove 301 can not only move towards or away from each other along the axial direction of the light-emitting aperture 103, but also move relative to each other in the radial direction of the light-emitting aperture 103. This allows the first support 200 and the second support 300 to have both the characteristic of relative movement in the axial direction and the characteristic of relative movement in the radial direction of the light-emitting aperture 103. The movable connection between the annular protrusion 202 and the annular groove 301 improves the sealing between the first support 200 and the second support 300, preventing dust from entering between the housing 101 and the projection lens 102 from the movable connection. Furthermore, this connection method has a travel restriction function in the radial direction of the light-emitting aperture 103, while the bottom of the annular groove 301 provides axial travel restriction in the axial direction of the light-emitting aperture 103.
[0082] like Figures 9-13 As shown, optionally, the first support 200 includes a first annular frame 203 and at least two limiting portions 204. The at least two limiting portions 204 are spaced apart circumferentially along the first annular frame 203 and are both fixedly connected to the first annular frame 203. The first annular frame 203 has the aforementioned annular protrusion 202. The second support 300 includes a second annular frame 302. The second annular frame 302 has the aforementioned annular groove 301. The limiting portion 204 has a limiting protrusion 205 at its end opposite to the first annular frame 203, and the limiting protrusion 205 is located on the side of the second annular frame 302 opposite to the first annular frame 203.
[0083] In this way, while the annular protrusion 202 and the annular groove 301 are engaged, the first bracket 200 and the second bracket 300 are axially limited by the limiting part 204, and the first bracket 200 and the second bracket 300 are connected as a component, which makes it easy to assemble the first bracket 200 and the second bracket 300 as a whole between the housing 101 and the projection lens 102.
[0084] In the axial direction of the light-emitting aperture 103, the distance between the limiting protrusion 205 and the annular protrusion 202 is greater than the distance between the side of the second annular frame 302 away from the first annular frame 203 and the bottom of the annular groove 301. In this way, axial space is provided for the first support 200 and the second support 300 to move in the axial direction of the light-emitting aperture 103.
[0085] like Figures 9-13 As shown, in some embodiments, at least three limiting portions 204 are distributed circumferentially along the first annular frame 203. The limiting portions 204 are located on one side of the outer ring edge of the second annular frame 302. The diameter of the circle enclosed by the at least three limiting portions 204 is larger than the diameter of the outer ring edge of the annular frame. The included angle between the fan-shaped regions corresponding to any two adjacent limiting portions 204 in the circumferential direction is less than 180°. Thus, the at least three limiting portions 204 constrain the second annular frame 302 within the circle enclosed by the at least three limiting portions 204. Combined with the annular protrusion 202 and the annular groove 301, this improves the reliability of the movable connection between the first support 200 and the second support 300, preventing loosening.
[0086] In some embodiments, the limiting part 204 is a limiting buckle, and the first bracket 200 and the second bracket 300 are easy to assemble and disassemble and the connection is reliable.
[0087] Optionally, the second bracket 300 further includes an extension ring 306. One side of the extension ring 306 is fixedly connected to the side of the second annular frame 302 opposite to the first annular frame 203, and the other side of the extension ring 306 is connected to the light-emitting side 105 of the projection lens 102. The limiting protrusion 205 is located on one side of the outer ring edge of the extension ring 306.
[0088] In some embodiments, the end face of the extension ring 306 facing away from the second annular frame 302 has an annular lubrication groove 307, which is filled with a lubricating substance (e.g., lubricating grease) to reduce the resistance of the axis shift as a lubrication part.
[0089] like Figures 9-13 As shown, optionally, the first bracket 200 further includes at least two first guide portions 206. The at least two first guide portions 206 are spaced apart circumferentially along the first annular frame 203 and are all fixedly connected to the first annular frame 203. The second bracket 300 further includes at least two second guide portions 303. The at least two second guide portions 303 are spaced apart circumferentially along the second annular frame 302 and are all fixedly connected to the second annular frame 302.
[0090] At least two first guide portions 206 and at least two second guide portions 303 extend axially along the light emission aperture 103, with each first guide portion 206 corresponding to a corresponding second guide portion 303. Thus, the first guide portions 206 and second guide portions 303 can move relative to each other both axially and radially along the light emission aperture 103. This not only further guides and limits the relative axial and / or radial movement of the first support 200 and the second support 300, but also, combined with the engagement of the annular protrusion 202 and the annular groove 301, and the limiting portion 204, helps maintain the axes of the first support 200 and the second support 300 parallel to the axis of the light emission aperture 103 during movement.
[0091] In some embodiments, three first guide portions 206 and three second guide portions 303 are evenly distributed circumferentially. This ensures consistency in the connection characteristics of the first support 200 and the second support 300 throughout the circumference with a relatively small number of portions, and facilitates ensuring that the axes of the first support 200 and the second support 300 are parallel to the axis of the light exit aperture 103. It is understood that the number of first guide portions 206 and second guide portions 303 can be determined separately as needed.
[0092] like Figures 9-13 As shown, optionally, one of the first guide portion 206 and the second guide portion 303 is a guide post, and the other is a guide cylinder; at least a portion of the guide post is located inside the guide cylinder. The inner diameter of the guide cylinder is larger than the outer diameter of the guide post. This simplifies the structure of the guide post and guide cylinder, allowing them to move relative to each other both axially and radially along the light emission aperture 103, thus providing guidance and limiting for the relative axial and / or radial movement of the first support 200 and the second support 300.
[0093] like Figures 9-13 As shown, optionally, the first support 200 further includes at least two first connecting portions 207. The at least two first connecting portions 207 are spaced apart circumferentially along the first annular frame 203 and are all fixedly connected to the first annular frame 203. The second support 300 further includes at least two second connecting portions 304. The at least two second connecting portions 304 are spaced apart circumferentially along the second annular frame 302 and are all fixedly connected to the second annular frame 302.
[0094] Among them, at least two first connecting parts 207 and at least two second connecting parts 304 correspond one-to-one, and each first connecting part 207 is elastically connected to the corresponding second connecting part 304.
[0095] Figure 14This is a schematic diagram showing the projection lens 102 being offset from the light exit aperture 103. Theoretically, the lens axis is coaxial with the light exit aperture 103 of the housing 101 and the first support 200, but due to accumulated tolerances, the lens axis is not concentric; it has a certain degree of offset. For example... Figure 14 As shown, the first bracket 200 and the second bracket 300 are elastically connected at at least two positions in the circumferential direction. Different first connection portions 207 can withstand different forces and undergo unequal elastic deformation. The elastic connection at at least two positions can adaptively adjust the posture and position of the second bracket 300, ensuring that the second bracket 300 and the light-emitting side 105 of the projection lens 102 are in close contact. This ensures that the second bracket 300 and the light-emitting side 105 of the projection lens 102 remain coaxial at all times, thereby providing tolerance compensation for the assembly of the projection lens 102 on the projector body 104 and improving the dustproof effect.
[0096] In some embodiments, three first connecting portions 207 and three second connecting portions are evenly distributed circumferentially. This ensures consistency in the elastic connection characteristics of the first support 200 and the second support 300 throughout the circumference with a relatively small number of portions, which is beneficial for keeping the axes of the first support 200 and the second support 300 parallel to the axis of the light exit aperture 103. It is understood that the number of first connecting portions 207 and second connecting portions 304 can be determined separately as needed.
[0097] like Figures 9-13 As shown, optionally, the first connecting portion 207 has a first blind hole, and the second connecting portion 304 has a second blind hole 305. The axial direction of both the first blind hole and the second blind hole 305 is parallel to the axial direction of the light-emitting aperture 103. In this way, the first blind hole and the second blind hole 305 can provide positioning and also provide guidance along the axial direction of the light-emitting aperture 103.
[0098] At least a portion of the first connecting portion 207 is located within the second blind hole 305, and the outer diameter of the first connecting portion 207 is smaller than the inner diameter of the second blind hole 305. An elastic element 500 is sandwiched between the first blind hole and the second blind hole 305. The elastic element 500 can be a compression spring. The fact that at least a portion of the first connecting portion 207 is located within the second blind hole 305 allows for a tight fit between the first connecting portion 207 and the second connecting portion 304, while the first and second blind holes 305 provide guidance and restraint for the elastic element 500. The smaller outer diameter of the first connecting portion 207 compared to the inner diameter of the second blind hole 305 prevents interference with the relative movement of the first support 200 and the second support 300 in the radial direction of the light exit hole 103.
[0099] like Figures 9-11As shown, optionally, at least two first limiting portions 204, at least two first guide portions 206, and at least two first connecting portions 207 are alternately arranged in the circumferential direction of the first annular frame 203. This arrangement of the alternating first limiting portions 204, first guide portions 206, and first connecting portions 207 results in a more uniform circumferential distribution, ensuring that the first support 200 and the second support 300 have nearly identical structural characteristics at all points in the circumferential direction. Furthermore, the adjacent first limiting portions 204, first guide portions 206, and first connecting portions 207 exhibit better synergy, improving the reliability of the movable connection and ensuring a better sealing and dustproof effect.
[0100] Optionally, the projection device 100 further includes an elastic sealing ring 600. The elastic sealing ring 600 is sandwiched between the bottom of the annular protrusion 202 and the annular groove 301, and is connected to both the bottom of the annular protrusion 202 and the bottom of the annular groove 301. Thus, as the first support 200 and the second support 300 move relative to each other, the elastic sealing ring 600 adapts to its elasticity, maintaining a constant seal between the annular protrusion 202 and the annular groove 301, ensuring a good seal while the first support 200 and the second support 300 are movably connected. The elastic sealing ring 600 can be made of foam, rubber, silicone, etc.
[0101] Figure 15 Compared to Figure 12 After axial focusing Figure 11 A cross-sectional view of the structure shown at BB; Figure 16 Compared to Figure 13 After axial focusing Figure 11 The structure shown is a cross-sectional view at CC. Combined with... Figure 12 , 13 As shown in Figures 15 and 16, during the adjustment process, the elasticity of the elastic element and the elastic sealing ring 600 can adaptively adjust the second bracket 300 in the axial direction, so that the second bracket 300 moves with the radial movement of the light-emitting side 105 of the projection lens 102, ensuring that the second bracket 300 is tightly fitted with the light-emitting side 105 of the projection lens 102. Simultaneously, the annular protrusion 202 and the annular groove 301 move relative to each other in the axial direction, and the elastic sealing ring 600 deforms adaptively under the elastic action, maintaining the seal between the annular protrusion 202 and the annular groove 301, so that the first bracket 200 and the second bracket 300 remain sealed at all times. The guide post and the guide cylinder move relative to each other in the axial direction to guide the axis shifting process. The limiting buckle prevents the first bracket 200 and the second bracket 300 from becoming loose.
[0102] Figure 17 yes Figure 11 The plan view of the structure after radial axis shift. Figure 18 yes Figure 17 The structure shown is a cross-sectional view at DD. Figure 19 yes Figure 17 The structure shown is a cross-sectional view at EE. (Combined with...) Figure 15 , 16 As shown in Figures 18 and 19, during the tilt-shift process, the light-emitting side 105 of the projection lens 102 moves radially relative to the second support 300, and the second support 300 moves radially relative to the first support 200. The elasticity of the elastic element and the elastic sealing ring 600 continues to adaptively adjust the second support 300 axially, ensuring a tight fit between the second support 300 and the light-emitting side 105 of the projection lens 102. Simultaneously, the annular protrusion 202 and the annular groove 301 move radially relative to each other, and the elastic sealing ring 600 deforms adaptively under elastic action, maintaining the seal between the annular protrusion 202 and the annular groove 301, so that the first support 200 and the second support 300 remain sealed at all times. The guide post and the guide cylinder move radially relative to each other. The limiting buckle prevents the first support 200 and the second support 300 from becoming loose.
[0103] In summary, by movably connecting the first and second brackets at the location of the light-emitting aperture on the housing and the light-emitting side of the projection lens, the second bracket can move radially and / or axially following the projection lens. This movement of the second bracket relative to the first bracket with the projection lens significantly reduces the resistance to lens movement and minimizes the impact on the lens's tilt-shifting and focusing processes.
[0104] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.
[0105] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A projection device, characterized in that, include: Casing, projector body, first stand and second stand; The outer shell has a receiving cavity and a light-emitting hole communicating with the receiving cavity; The projector body is connected to the outer shell within the receiving cavity. The projector body has a projection lens, and the light-emitting side of the projection lens faces the light-emitting hole. The first bracket is fixedly connected to the outer shell at the light outlet; The second bracket is movably connected to the first bracket, and the side of the second bracket facing away from the first bracket is connected to the light-emitting side of the projection lens; During the movement of the projection lens relative to the housing, the second bracket is displaced relative to the first bracket in the radial and / or axial direction of the light outlet hole.
2. The projection device as described in claim 1, characterized in that, One of the first bracket and the second bracket has an annular protrusion, and the other of the first bracket and the second bracket has an annular groove; at least a portion of the annular protrusion is located within the annular groove. The width of the annular protrusion is smaller than the width of the annular groove.
3. The projection device as described in claim 2, characterized in that, The first bracket includes: a first annular frame and at least two limiting parts, the at least two limiting parts being arranged circumferentially around the first annular frame and being fixedly connected to the first annular frame; the first annular frame has the annular protrusion; The second support includes: a second annular frame having the annular groove; The limiting part has a limiting protrusion at the end opposite to the first annular frame, and the limiting protrusion is located on the side of the second annular frame opposite to the first annular frame; in the axial direction of the light outlet hole, the distance between the limiting protrusion and the annular protrusion is greater than the distance between the side of the second annular frame opposite to the first annular frame and the bottom of the annular groove.
4. The projection device as described in claim 3, characterized in that, The first bracket further includes: at least two first guide portions, which are arranged at intervals along the circumference of the first annular frame and are fixedly connected to the first annular frame; The second bracket further includes at least two second guide portions, which are arranged at intervals along the circumference of the second annular frame and are fixedly connected to the second annular frame. The at least two first guide portions and the at least two second guide portions extend along the axial direction of the light-emitting aperture. The at least two first guide portions and the at least two second guide portions correspond one-to-one, and each first guide portion cooperates with the corresponding second guide portion.
5. The projection device as described in claim 4, characterized in that, One of the first guide portion and the second guide portion is a guide post, and the other is a guide cylinder; at least a portion of the guide post is located inside the guide cylinder; The inner diameter of the guide cylinder is larger than the outer diameter of the guide post.
6. The projection device as described in claim 4, characterized in that, The first bracket further includes: at least two first connecting parts, which are arranged at intervals along the circumference of the first annular frame and are fixedly connected to the first annular frame; The second bracket further includes: at least two second connecting parts, which are arranged at intervals along the circumference of the second annular frame and are fixedly connected to the second annular frame; The at least two first connecting parts and the at least two second connecting parts correspond one-to-one, and each first connecting part is elastically connected to the corresponding second connecting part.
7. The projection device as described in claim 6, characterized in that, The first connecting portion has a first blind hole, and the second connecting portion has a second blind hole; the axial direction of the first blind hole and the axial direction of the second blind hole are both parallel to the axial direction of the light outlet hole; At least a portion of the first connecting portion is located within the second blind hole, and the outer diameter of the first connecting portion is smaller than the inner diameter of the second blind hole; an elastic element is sandwiched between the first blind hole and the second blind hole.
8. The projection device as described in claim 6, characterized in that, The at least two first limiting parts, the at least two first guiding parts, and the at least two first connecting parts are arranged alternately in the circumferential direction of the first annular frame.
9. The projection device as described in any one of claims 2 to 8, characterized in that, The projection device further includes an elastic sealing ring, which is sandwiched between the bottom of the annular protrusion and the annular groove, and is connected to the bottom of the annular protrusion and the annular groove respectively.
10. The projection device as described in any one of claims 2 to 8, characterized in that, The second bracket has a lubrication part on the side facing the projection lens, and the light-emitting side of the projection lens slides in contact with the lubrication part.