Projection device
By using a sheath and pressure ring design in the projection device, the dust prevention problem during radial lens movement is solved, achieving sealing and low resistance, thus ensuring the dust prevention effect of the projection device and the normal movement of the lens.
Patent Information
- Application Number
- CN202520675506.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-04-10
AI Technical Summary
In existing projection equipment, when the lens moves radially, the foam generates resistance and deformation, which cannot effectively prevent dust and affects the clarity of the image.
The sheath design features multiple deformable sections in the axial and radial directions. These sections deform synchronously as the lens moves, achieving a tight seal and low resistance. Combined with the pressure ring and connectors, this ensures a tight seal between the lens and the housing.
It effectively prevents dust from entering the lens, reduces lens movement resistance, improves lens lifespan and focusing quality, and maintains image clarity.
Smart Images
Figure CN223897752U_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] A projection device is a multifunctional display device that provides users with a large-screen, high-quality visual experience through optical technology and multimedia functions. A projection device typically consists 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.
[0003] However, when the lens assembly moves radially, the foam generates resistance and undergoes significant deformation, making it prone to warping and compromising its dustproof performance. Utility Model Content
[0004] This application provides a projection device. It solves the dust prevention problem of radially movable lenses in the prior art. The technical solution is as follows:
[0005] A projection device is provided, comprising: a housing, a projector body, and a protective sleeve;
[0006] The outer shell has a receiving cavity and a light-emitting hole communicating with the receiving cavity;
[0007] 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.
[0008] The sheath is located between the light-emitting hole and the light-emitting side of the projection lens, and one end of the sheath is connected to the outer shell at the location of the light-emitting hole, and the other end of the sheath is connected to the light-emitting side of the projection lens.
[0009] The sheath has a plurality of deformable portions arranged in the axial direction of the sheath, and the sheath is used to deform in the radial and / or axial direction of the sheath by the plurality of deformable portions after the projection lens moves relative to the housing.
[0010] Optionally, the sheath includes: a plurality of connecting portions and a plurality of deformable portions, the plurality of connecting portions and the plurality of deformable portions being arranged alternately in the axial direction of the sheath, and in the axial direction of the sheath, both sides of the deformable portions are respectively connected to two adjacent connecting portions;
[0011] The deformable portion is a curved portion that protrudes outward relative to the connecting portion.
[0012] Optionally, the projection device further includes: a first pressure ring; a first connecting ring at one end of the sheath near the projection lens, the first connecting ring protruding inward relative to the sheath; a lens front cover on the light-emitting side of the projection lens, and the first connecting ring located between the first pressure ring and the lens front cover in the axial direction of the sheath;
[0013] The first pressure ring is connected to the front lens cover, and the front lens cover is connected to the first connecting ring.
[0014] Optionally, the first pressure ring has multiple snap-fit components on the side facing the projection lens; the lens front cover has multiple snap-fit holes; the multiple snap-fit components are snapped into the multiple snap-fit holes one by one.
[0015] Optionally, the snap-fit component includes: a connecting post and a post head; one end of the connecting post is fixedly connected to the side of the first pressure ring facing the lens front cover, and the other end of the connecting post is fixedly connected to the post head, wherein the radial dimension of the post head is larger than the radial dimension of the connecting post;
[0016] The connecting post in the snap-fit component is used to pass through the corresponding snap-fit hole, so that the post head snaps onto the side of the lens front cover away from the first pressure ring.
[0017] Optionally, the lens front cover further includes: a plurality of through holes corresponding one-to-one with the plurality of snap-fit holes, and a connecting channel for connecting the corresponding snap-fit holes and the through holes; the radial dimension of the protrusion is larger than the outer dimension of the snap-fit hole and smaller than the outer dimension of the through hole;
[0018] The connecting post is used to pass through the through hole and slide into the snap-fit hole through the connecting channel.
[0019] Optionally, the lens front cover includes: a first ring body and a second ring body, and a side ring located between the first ring body and the second ring body in the axial direction of the sheath; the side of the side ring facing the sheath is connected to the outer ring edge of the first ring body, and the side of the side ring away from the sheath is connected to the inner ring edge of the second ring body;
[0020] The first ring body is connected to the first pressure ring, the second ring body is connected to the first connecting ring, and at least a portion of the first ring body is located within the area enclosed by the first connecting ring.
[0021] Optionally, the projection device further includes: a second pressure ring and a plurality of connectors; the end of the sheath away from the projection lens has a second connecting ring, the second connecting ring protruding outward relative to the sheath; in the axial direction of the sheath, the second connecting ring is located between the second pressure ring and the outer shell;
[0022] The plurality of connectors are used to connect the second pressure ring, the second connecting ring, and the housing.
[0023] Optionally, the housing includes: a front cover plate and a housing body connected to each other, the front cover plate and the housing body forming the receiving cavity; the front cover plate has the light emission hole, and the side of the front cover plate opposite to the receiving cavity has a support groove, the support groove communicating with the light emission hole;
[0024] At least a portion of the second pressure ring and the second connecting ring are located within the bearing groove.
[0025] Optionally, the projection device further includes a light-transmitting protective lens, which is fixed to the side of the second pressure ring away from the protective sleeve.
[0026] The beneficial effects of the technical solution provided in this application include at least the following: the sheath has multiple deformable portions arranged side-by-side at intervals, and the arrangement direction of the multiple deformable portions is parallel to the axial direction of the sheath. Through the multiple deformable portions in the sheath, the sheath can be deformed radially and / or axially. Thus, when the projection lens moves radially, the sheath can deform synchronously radially, ensuring both the sealing between the outer shell and the projection lens, thereby protecting the projection lens from dust, and reducing resistance to the movement of the projection lens. Attached Figure Description
[0027] 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.
[0028] Figure 1 This is a schematic diagram of the dustproof structure of projection equipment in related technologies;
[0029] Figure 2 This is a schematic diagram of a tilt-shift lens tilting radially upwards relative to the housing;
[0030] Figure 3 This is a schematic diagram of a tilt-shift lens tilting radially downwards relative to the housing;
[0031] Figure 4 This is a schematic diagram of a tilt-shift lens moving to the left along the axial direction relative to the outer casing for focusing.
[0032] Figure 5 This is a schematic diagram of a tilt-shift lens moving to the right along the axial direction relative to the outer casing for focusing.
[0033] Figure 6 This is a schematic diagram of a planar structure of a projection device provided in an embodiment of this application;
[0034] Figure 7 This is a schematic diagram of a projection device structure provided in an embodiment of this application;
[0035] Figure 8 This is a schematic diagram of a sheath structure provided in an embodiment of this application;
[0036] Figure 9 This is a schematic cross-sectional view of a projection device provided in an embodiment of this application;
[0037] Figure 10 This is a schematic diagram of an assembly structure of a first pressure ring and a lens front cover provided in an embodiment of this application;
[0038] Figure 11 This is a schematic diagram of another assembly structure of the first pressure ring and the lens front cover provided in an embodiment of this application;
[0039] Figure 12 This is a schematic diagram of a lens front cover structure provided in an embodiment of this application;
[0040] Figure 13 This is a schematic diagram of another assembly structure of the first pressure ring and the lens front cover provided in the embodiments of this application;
[0041] Figure 14 This is a schematic diagram of another lens front cover structure provided in an embodiment of this application;
[0042] Figure 15 This is a schematic diagram of a snap-fit structure provided in an embodiment of this application;
[0043] Figure 16 This is a schematic diagram of an assembly structure between a second pressure ring and a housing provided in an embodiment of this application;
[0044] Figure 17 This is a schematic diagram of a three-dimensional structure of a projection device provided in an embodiment of this application. Detailed Implementation
[0045] 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.
[0046] 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 sheet 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 sheet, preventing dust from accumulating on the light-transmitting sheet and the lens elements within this sealed space, thus maintaining a clear image.
[0047] 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.
[0048] 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.
[0049] 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).
[0050] 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 210 and the outer casing 100. A ring of foam 300 is added to the end face of the projection lens 210 near the outer casing 100 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 210 will have a back-and-forth (corresponding) Figure 1 During the movement (left and right) and back and forth, the foam 300 will be compressed or released, but the foam 300 is always in a compressed state, which plays a sealing role. Therefore, it reduces the amount of dust intrusion between the light-transmitting sheet 400 fixed at the light-emitting hole 110 on the outer shell 100 and the projection lens 210, which plays a dustproof role and keeps the light-transmitting sheet 400 and the projection lens 210 clean, thereby ensuring the clarity of the picture.
[0051] Tilt-shift lenses, as a new type of lens, are being used in projection devices due to their advantages such as optimized optical performance, dynamic focal plane control, and intelligent system integration with AI adaptive adjustment.
[0052] 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.
[0053] Figure 2 This is a schematic diagram of a tilt-shift lens tilting radially upward relative to the outer casing. Figure 3 This is a schematic diagram of a tilt-shift lens tilting radially downwards relative to the housing. Figure 4 This is a schematic diagram of a tilt-shift lens moving to the left along the axial direction relative to the outer casing for focusing. Figure 5 This is a schematic diagram of a tilt-shift lens moving to the right along the axial direction relative to the outer casing for focusing. Figures 2-5 This is merely an illustrative example of the paths that a tilt-shift lens can move axially and radially, and should not be construed as a limitation on the direction of movement of the tilt-shift lens.
[0054] When tilt-shift lenses are used in projection equipment, using foam 300 for dust protection will inevitably affect the movement of the lens. For example, during the radial tilt-shift or axial focusing process of the tilt-shift lens, the force exerted by the foam 300 on the lens will affect the lens movement, thereby affecting the tilt-shift and focusing process, and may even cause lens damage.
[0055] Conventional foam 300 cannot seal the space between the projection lens 210 and the housing 100. Since the housing 100 is a closed space, there is a certain gap between the projection lens 210 and the housing 100. Dust generated by the internal fan can easily accumulate on the projection lens 210, affecting the image display effect.
[0056] 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 000, which is described below:
[0057] Figure 6 This is a schematic diagram of a planar structure of a projection device provided in an embodiment of this application. Please refer to it. Figure 6 This application provides a projection device 000, including: a housing 100, a projector body 200, and a protective sleeve 500.
[0058] The housing 100 has a receiving cavity and a light-emitting hole 110 communicating with the receiving cavity. Figure 7 This is a schematic diagram of a projection device structure provided in an embodiment of this application. The light exit aperture 110 can be referenced. Figure 7 .
[0059] The projector body 200 is connected to the housing 100 within the receiving cavity. The projector body 200 has a projection lens 210, with the light-emitting side of the projection lens 210 facing the light-emitting aperture 110.
[0060] The sheath 500 is located between the light-emitting hole 110 and the light-emitting side of the projection lens 210, with one end of the sheath 500 connected to the housing 100 at the location of the light-emitting hole 110, and the other end of the sheath 500 connected to the light-emitting side of the projection lens 210.
[0061] The sheath 500 has a plurality of deformable portions 510 arranged in the axial direction of the sheath 500. The sheath 500 is used to deform in the radial and / or axial direction of the sheath 500 by means of the plurality of deformable portions 510 after the projection lens 210 moves relative to the housing 100.
[0062] It is understood that the projection lens 210 in the projection device 000 may move only in the radial direction, only in the axial direction, or both in the radial and axial directions simultaneously; this application does not impose any limitations on this. The projection lens 210 in the projection device 000 of this application is, for example, a tilt-shift lens as described above. Correspondingly, the deformable part 510 may also deform only in the radial direction, or only in the axial direction, or both in the radial and axial directions simultaneously.
[0063] In summary, the sheath has multiple deformable sections arranged side-by-side at intervals, with the arrangement direction of these sections parallel to the axis of the sheath. These multiple deformable sections allow the sheath to deform radially and / or axially. Thus, when the projection lens moves radially, the sheath can deform synchronously in the radial direction, ensuring a tight seal between the housing and the projection lens, thereby protecting the lens from dust, and reducing resistance to the movement of the projection lens.
[0064] Please refer to Figure 7 In one feasible implementation, the projector body 200 may include a light source device, an optical engine device 220, and a projection lens 210. Here, the light source device provides an illumination beam, the optical engine device 220 generates an image beam based on the illumination beam provided by the light source device, and guides the image beam to the projection lens 210. The projection lens 210 images the image beam upon receiving it and projects it onto a projection screen to display an image on the screen.
[0065] The light source device, the optical engine device 220, and the projection lens 210 all include housings. The housing of the light source device can be connected to the housing of the optical engine device 220, and the housing of the optical engine device 220 can also be connected to the housing of the projection lens 210. In this way, by connecting the housings of the light source device, the optical engine device 220, and the projection lens 210, the light source device, the optical engine device 220, and the projection lens 210 can be assembled into the projector body 200.
[0066] Figure 8 This is a schematic diagram of a sheath structure provided in an embodiment of this application. Please refer to it. Figure 8 In one feasible embodiment, the sheath 500 includes a plurality of connecting portions 520 and a plurality of deformable portions 510, the plurality of connecting portions 520 and the plurality of deformable portions 510 being arranged alternately in the axial direction of the sheath 500, and in the axial direction of the sheath 500, the two sides of the deformable portion 510 are respectively connected to two adjacent connecting portions 520.
[0067] The deformable portion 510 is a curved portion that protrudes outward relative to the connecting portion 520.
[0068] By using the outwardly protruding curved portion relative to the connecting portion 520, the amount of deformation of the sheath 500 as it moves with the projection lens 210 can be reduced, thereby reducing the resistance of the sheath 500 to the movement of the projection lens 210, facilitating normal tilt-shifting and focusing of the projection lens 210, and improving lens lifespan and focusing quality.
[0069] For example, the end of the deformable portion 510 away from the connecting portion 520 is a semi-circular curved portion.
[0070] Specifically, sheath 500 is a sheath made of elastic material, such as silicone or rubber.
[0071] Since the deformable portion 510 in the sheath 500 is mainly used to deform synchronously with the movement of the projection lens 210, in order to facilitate the deformation of the deformable portion 510 and generate lower resistance for the projection lens 210, specifically, in a feasible embodiment, the thickness of the deformable portion 510 is less than the thickness of the connecting portion 520.
[0072] Please refer to Figure 7 In one feasible implementation, the projection device 000 further includes a first pressure ring 600. Please refer to [reference needed]. Figure 8 The end of the sheath 500 near the projection lens 210 has a first connecting ring 530, which protrudes inward relative to the sheath 500.
[0073] Figure 9 This is a schematic cross-sectional view of a projection device provided in an embodiment of this application. Please refer to it. Figure 9 The projection lens 210 includes a front lens cover 211, a lens housing 212, and a lens element 213. The front lens cover 211 and the lens element 213 are both fixed to the lens housing 212. When the projection lens 210 moves, the front lens cover 211, the lens housing 212, and the lens element 213 move synchronously, achieving synchronous image movement.
[0074] The projection lens 210 has a lens front cover 211 on the light-emitting side. In the axial direction of the sheath 500, the first connecting ring 530 is located between the first pressure ring 600 and the lens front cover 211.
[0075] The first pressure ring 600 is connected to the lens front cover 211, and the lens front cover 211 is connected to the first connecting ring 530.
[0076] The first pressure ring 600, the lens front cover 211 and the first connecting ring 530 work together to connect the sheath 500 and the projection lens 210, so that the end of the sheath 500 near the projection lens 210 can move synchronously with the projection lens 210, thereby ensuring the sealing of the connection between the sheath 500 and the projection lens 210.
[0077] Figure 10 This is a schematic diagram of an assembly structure for a first retaining ring and a lens front cover provided in an embodiment of this application. Please refer to... Figure 10 In one feasible implementation, the first retaining ring 600 has a plurality of snap-fit pieces 610 on the side facing the projection lens 210. The lens front cover 211 has a plurality of snap-fit holes K1. The plurality of snap-fit pieces 610 are snapped into the plurality of snap-fit holes K1 one by one.
[0078] The first pressure ring 600 and the lens front cover 211 are detachably connected by a series of snap-fit pieces 610 on the first pressure ring 600 and a series of snap-fit holes K1 on the lens front cover 211, which facilitates the assembly of the first pressure ring 600 and the lens front cover 211, as well as the reuse of the first pressure ring 600 and / or the lens front cover 211.
[0079] Specifically, the first connecting ring 530 has multiple circumferentially spaced docking holes D2, and the lens front cover 211 has multiple circumferentially spaced docking pieces D1 on the side facing the protective sleeve 500. The docking holes D2 and docking pieces D1 correspond one-to-one, and the docking pieces D1 are fitted into the docking holes D2. In this way, by fitting the docking holes D2 and the docking pieces D1 together, the protective sleeve 500 can be initially fixed on the lens front cover 211. Then, by snapping the fastener 610 into the fastener hole K1, the protective sleeve 500 and the lens front cover 211 are fixedly connected.
[0080] Figure 11 This is a schematic diagram of another assembly structure of the first retaining ring and the lens front cover provided in an embodiment of this application. Please refer to... Figure 11 For example, the mating part D1 is a screw, in which case the mating part D1 can be threadedly connected to the lens housing 212, and the mating hole D2 is a blind hole, with at least part of the end of the mating part D1 away from the lens housing 212 located in the mating hole D2.
[0081] For example, there are three snap-fit pieces 610 and three snap-fit holes K1, and four mating holes D2 and four mating pieces D1.
[0082] Understandably, in order to connect the first retaining ring 600 to the lens front cover 211, the lens front cover 211 is connected to the first connecting ring 530. The snap-fit hole K1 is located on the inner side of the mating member D1 along the radial direction of the lens front cover 211, and the snap-fit member 610 is located on the inner side of the mating hole D2 along the radial direction of the first retaining ring 600.
[0083] In one feasible implementation, the snap-fit member 610 includes a connecting post 611 and a head 612. One end of the connecting post 611 is fixedly connected to the side of the first pressure ring 600 facing the lens front cover 211, and the other end of the connecting post 611 is fixedly connected to the head 612, wherein the radial dimension of the head 612 is larger than the radial dimension of the connecting post 611.
[0084] Among them, the connecting post 611 in the snap-fit component 610 is used to pass through the corresponding snap-fit hole K1, so that the post head 612 is snapped onto the side of the lens front cover 211 away from the first pressure ring 600.
[0085] The connecting post 611 and post head 612 in the snap-fit part 610 can facilitate the snap-fit part 610 to pass through the snap-fit hole K1, and can also snap the post head 612 onto the side of the lens front cover 211 away from the first pressure ring 600, thereby realizing the snap-fit between the first pressure ring 600 and the lens front cover 211, and fixing the sheath 500 between the first pressure ring 600 and the lens front cover 211.
[0086] Figure 12 This is a schematic diagram of a lens front cover structure provided in an embodiment of this application. Please refer to it. Figure 12 Specifically, in one feasible embodiment, the lens front cover 211 further includes: a plurality of through holes K2 corresponding one-to-one with the plurality of snap-fit holes K1, and a connecting channel K3 for connecting the corresponding snap-fit holes K1 and through holes K2. The radial dimension of the protrusion 612 is larger than the outer dimensions of the snap-fit holes K1 and smaller than the outer dimensions of the through holes K2.
[0087] The connecting post 611 is used to pass through the through hole K2 and slide into the snap-fit hole K1 through the connecting channel K3.
[0088] To clearly show the card slot K1, through hole K2, and connecting channel K3, Figure 12 The middle section is divided into three parts by dashed lines: the snap-fit hole K1, the through hole K2, and the connecting channel K3.
[0089] The radial dimension of the pin 612 is smaller than that of the through hole K2 and larger than that of the snap-fit hole K1. This allows the pin 612 to pass through the through hole K2 and be limited by the snap-fit hole K1. The connecting post 611 located between the pin 612 and the first pressure ring 600 is used to pass through the through hole K2 and slide into the snap-fit hole K1 through the connecting channel K3. In this way, the pin 612 can slide through the through hole K2 and the connecting channel K3 into the snap-fit hole K1 to snap the first pressure ring 600 and the lens front cover 211 together.
[0090] Figure 13 This is a schematic diagram of another assembly structure of the first retaining ring and the lens front cover provided in this application embodiment. A schematic diagram of the structure after the first retaining ring 600 and the lens front cover 211 are engaged can be found in the following figure. Figure 13 The structure shown is such that the first retaining ring 600 and the lens front cover 211 are connected by a rotating snap-fit mechanism, eliminating the need for screws or adhesives for fixation. This makes assembly and disassembly convenient, allows for reuse, and avoids damage to the projection lens 210 caused by screws.
[0091] When the connecting pin 611 can slide from the snap-fit hole K1 into the through hole K2 through the connecting channel K3, to ensure a stable snap-fit between the first retaining ring 600 and the lens front cover 211 and to prevent the connecting pin 611 from detaching from the snap-fit hole K1 and sliding into the through hole K2, the radial dimension of the connecting channel K3 is slightly smaller than the radial dimension of the connecting pin 611, or there is an interference fit between the connecting pin 611 and the connecting channel K3. When the first retaining ring 600 and the lens front cover 211 are snapped together, the pin head 612 is passed through the through hole K2 on the lens front cover 211, and the first retaining ring 600 is rotated forcefully, so that the connecting pin 611 slides into the snap-fit hole K1 after passing through the connecting channel K3. In this way, without external force, the phenomenon of the connecting pin 611 detaching from the snap-fit hole K1 and sliding into the through hole K2 can be avoided.
[0092] In other feasible embodiments, the lens front cover 211 may only have a snap-fit hole K1, and the snap-fit member 610 may be a column. In this case, the snap-fit member 610 and the snap-fit hole K1 are directly interference-fitted to achieve a fixed connection between the first pressure ring 600 and the lens front cover 211. For example, the snap-fit member 610 is a column made of elastic material to facilitate the installation and removal of the snap-fit member 610 and the through hole K2.
[0093] Figure 14 This is a schematic diagram of another lens front cover structure provided in an embodiment of this application. Please refer to... Figure 14 Specifically, in one feasible embodiment, the lens front cover 211 includes: a first ring body H1 and a second ring body H2, and a side ring H3 located axially between the first ring body H1 and the second ring body H2 in the sheath 500. The side ring H3 facing the sheath 500 is connected to the outer ring edge of the first ring body H1, and the side of the side ring H3 away from the sheath 500 is connected to the inner ring edge of the second ring body H2.
[0094] The first ring body H1 is connected to the first pressure ring 600, the second ring body H2 is connected to the first connecting ring 530, and at least a portion of the first ring body H1 is located within the area enclosed by the first connecting ring 530.
[0095] The first ring body H1 protrudes towards the side closer to the sheath 500 relative to the second ring body H2, so that a clearance space is formed between the first ring body H1 and the lens housing 212. The clearance space avoids the post head 612 in the snap-fit part 610, which facilitates the normal snap-fit between the first pressure ring 600 and the lens front cover 211.
[0096] In other feasible embodiments, the side of the lens cover 211 facing the sheath 500 and the side facing away from the sheath 500 are both flat. In this case, a step structure can be provided on the lens housing 212 at the position corresponding to the snap-fit hole K1 to create clearance space. Alternatively, in Figure 14 Based on the lens front cover 211 shown, a structure protruding towards the side away from the protective sleeve 500 is provided at the corresponding positions of the lens housing 212 and the first ring body H1. In this way, a larger clearance space can be formed between the lens front cover 211 and the lens housing 212.
[0097] Figure 15 This is a schematic diagram of a snap-fit connector structure provided in an embodiment of this application. Please refer to it. Figure 15 In one feasible implementation, in order to reduce the mounting gap between the first pressure ring 600 and the lens front cover 211 along the axial direction of the sheath 500, the side of the column head 612 facing the connecting column 611 has a limiting ring 613, and the outer peripheral surface of the limiting ring 613 decreases in radial dimension from the connecting column 611 side to the column head 612 side.
[0098] By using the outer circumferential surface of the limiting ring 613, the stability of the snap-fit 610 in the axial direction of the sheath 500 and the lens front cover 211 is increased, thereby reducing the installation gap between the first pressure ring 600 and the lens front cover 211 in the axial direction of the sheath 500, ensuring the sealing between the first pressure ring 600 and the lens front cover 211, and preventing dust from entering the sealed space between the projection lens 210 and the housing 100 from the snap-fit position of the first pressure ring 600 and the lens front cover 211.
[0099] Figure 16 This is a schematic diagram of the assembly structure between the second pressure ring and the outer shell provided in an embodiment of this application. Please refer to... Figure 16 In one possible implementation, the projection device 000 further includes: a second pressure ring 700 and a plurality of connectors L (see reference). Figure 7 (The connector in the middle). The end of the sheath 500 away from the projection lens 210 has a second connecting ring 540, which protrudes outward relative to the sheath 500. In the axial direction of the sheath 500, the second connecting ring 540 is located between the second pressure ring 700 and the housing 100.
[0100] Among them, multiple connectors L are used to connect the second pressure ring 700, the second connecting ring 540 and the housing 100.
[0101] By combining the second pressure ring 700 with multiple connectors L, the end of the sheath 500 near the outer shell 100 can be fixedly connected to the outer shell 100, and the sealing of the connection between the sheath 500 and the outer shell 100 can be ensured.
[0102] Figure 7 and Figure 16To more clearly illustrate the structure of the projection device 000 in this application, only the front cover plate 120 of the housing 100 is shown.
[0103] Specifically, multiple connectors L are evenly distributed along the axis of the sheath 500 to provide uniform pressure to all positions of the pressure ring.
[0104] For example, the connector L is a screw. Correspondingly, for example, multiple through holes are also provided on the second connecting ring 540 and the front cover plate 120. The second pressure ring 700 has multiple connecting posts 710 on the side facing the front cover plate 120. The connecting posts 710 have internal threaded holes. The screw passes through the through holes on the front cover plate 120 and the second connecting ring 540 and is threaded into the internal threaded holes on the connecting posts 710 to connect the second pressure ring 700, the second connecting ring 540 and the outer shell 100 into a whole.
[0105] Please refer to Figure 10 Multiple notches 541 are made along the edge of the second connecting ring 540. The notches 541 correspond one-to-one with the connecting posts 710. The connecting posts 710 pass through the notches 541 and the front cover plate 120 in sequence, and are then connected to the connecting posts 710 by screws.
[0106] The notch 541 allows for adaptive deformation along the circumferential direction of the sheath 500 (the notch 541 expands or shrinks) as the sheath 500 moves with the projection lens 210 (e.g., radially shifts the axis), improving the warping problem, ensuring the sealing of the connection between the second pressure ring 700 and the second connecting ring 540, and thus ensuring the dustproof effect on the projection lens 210.
[0107] Please refer to Figure 8 In one possible implementation, the end of the sheath 500 facing the projection lens 210 further includes a cover 550. The cover 550 protrudes radially outward relative to the deformable portion 510 or the connecting portion 520 of the sheath 500.
[0108] Please refer to Figure 9 The cover 550 is used to cover the lens front cover 211 and improve the sealing of the connection between the cover 500 and the projection lens 210.
[0109] Specifically, the inner ring of the cover 550 is provided with a guide structure to facilitate the alignment of the sheath 500 with the projection lens 210 and its engagement. For example, the guide structure is such that the radial dimension of the inner ring of the cover 550 decreases continuously from the side away from the light-emitting hole 110 to the side closer to the light-emitting hole 110.
[0110] Please refer to Figure 7In one feasible embodiment, the housing includes a front cover plate 120 and a housing body connected to each other, the front cover plate 120 and the housing body forming a receiving cavity. The front cover plate 120 has a light emission hole 110, and the front cover plate 120 has a support groove 130 on the side opposite to the receiving cavity, the support groove 130 communicating with the light emission hole 110.
[0111] At least a portion of the second pressure ring 700 and the second connecting ring 540 are located within the bearing groove 130.
[0112] The support groove 130 on the front cover plate 120 can reduce the size of the projection device 000 along the axis of the projection lens 210, thus enabling a more compact design of the projection device 000.
[0113] Please refer to Figure 9 In one feasible implementation, the projection device 000 further includes a light-transmitting protective lens 800, which is sealed and fixed to the side of the second pressure ring 700 away from the sheath 500.
[0114] The light-transmitting protective lens 800 can protect the projection lens 210 inside the protective sleeve 500, and also form a sealed space between the lens 800, the outer shell 100, the protective sleeve 500 and the projection lens 210, preventing dust from entering the sealed space and preventing dust from adhering to the light-transmitting protective lens 800 and the lens 213, thus maintaining the image clarity of the projection device 000.
[0115] Please refer to Figure 8 In one feasible implementation, the radial dimension of the connecting portion 520 in the sheath 500 gradually decreases from the side of the second connecting ring 540 to the side of the first connecting ring 530, that is, the sheath 500 is approximately a trumpet-shaped annular sleeve.
[0116] The radial dimension of the connecting part 540 in the sheath 500 gradually decreases from the side of the second connecting ring 540 to the side of the first connecting ring 530, which facilitates the deformation of the sheath 500 and reduces the resistance of the sheath 500 to the projection lens 210. This prevents problems such as focus slippage and accelerated wear of the lens threads caused by external forces during the tilt-shifting and / or focusing process of the projection lens 210, extends the lens life, reduces dust intrusion, and maintains image clarity.
[0117] Figure 17 This is a schematic diagram of a three-dimensional structure of a projection device provided in an embodiment of this application.
[0118] The assembly process of the projection device 000 in this application embodiment can be referred to Figure 7The projection device 000 also includes a main support 900. The projector body 200 is fixed to the main support 900 with screws, and the main support 900 is fixed to the bottom plate of the lower shell. After the main support 900 is fixed, the side plates and top plate of the outer shell are fixed, and then the rear shell cover is installed. The second pressure ring 700, the protective sleeve 500, and the front shell cover 120 are pre-connected by the connector L. The protective sleeve 500 in the front shell cover 120 is aligned with the projection lens 210 in the projector body 200. After alignment, the front shell cover 120 is fixed to the main support 900 with screws. After the front shell cover 120 is fixed, the first pressure ring 600 enters the interior of the protective sleeve 500 and engages with the lens front cover 211 by rotation. After the first pressure ring 600 is assembled, the light-transmitting protective lens 800 is fixed to the end of the second pressure ring 700 away from the protective sleeve 500.
[0119] It should be noted that during the assembly process, the projection lens 210 is in position 0, for example... Figure 6 As shown. The lower shell bottom plate, front shell cover plate 120, rear shell cover plate, outer shell side plates, and top plate are all part of the outer shell 100. The projector body 200 can also be fixed to other structures of the outer shell 100, as long as the assembly is secure and there is no displacement.
[0120] In summary, the sheath has multiple deformable sections arranged side-by-side at intervals, with the arrangement direction of these sections parallel to the axis of the sheath. These multiple deformable sections allow the sheath to deform radially and / or axially. Thus, when the projection lens moves radially, the sheath can deform synchronously in the radial direction, ensuring a tight seal between the housing and the projection lens, thereby protecting the lens from dust, and reducing resistance to the movement of the projection lens.
[0121] 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.
[0122] 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: The outer casing, projector body, and protective sleeve; 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 sheath is located between the light-emitting hole and the light-emitting side of the projection lens, and one end of the sheath is connected to the outer shell at the location of the light-emitting hole, and the other end of the sheath is connected to the light-emitting side of the projection lens. The sheath has a plurality of deformable portions arranged in the axial direction of the sheath, and the sheath is used to deform in the radial and / or axial direction of the sheath by the plurality of deformable portions after the projection lens moves relative to the housing.
2. The projection device as described in claim 1, characterized in that, The sheath includes: a plurality of connecting portions and a plurality of deformable portions, the plurality of connecting portions and the plurality of deformable portions being arranged alternately in the axial direction of the sheath, and in the axial direction of the sheath, each side of the deformable portion is connected to two adjacent connecting portions; The deformable portion is a curved portion that protrudes outward relative to the connecting portion.
3. The projection device as described in claim 1, characterized in that, The projection device further includes: a first pressure ring; a first connecting ring at one end of the sheath near the projection lens, the first connecting ring protruding inward relative to the sheath; a lens front cover on the light-emitting side of the projection lens, and the first connecting ring located between the first pressure ring and the lens front cover in the axial direction of the sheath; The first pressure ring is connected to the front lens cover, and the front lens cover is connected to the first connecting ring.
4. The projection device as described in claim 3, characterized in that, The first pressure ring has multiple snap-fit components on the side facing the projection lens; the lens front cover has multiple snap-fit holes; the multiple snap-fit components and the multiple snap-fit holes are snapped together one by one.
5. The projection device as described in claim 4, characterized in that, The snap-fit component includes: a connecting post and a post head; one end of the connecting post is fixedly connected to the side of the first pressure ring facing the lens front cover, and the other end of the connecting post is fixedly connected to the post head, wherein the radial dimension of the post head is greater than the radial dimension of the connecting post; The connecting post in the snap-fit component is used to pass through the corresponding snap-fit hole, so that the post head snaps onto the side of the lens front cover away from the first pressure ring.
6. The projection device as described in claim 5, characterized in that, The lens front cover also has: a plurality of through holes corresponding one-to-one with the plurality of snap-fit holes, and a connecting channel for connecting the corresponding snap-fit holes and the through holes; the radial dimension of the protrusion is larger than the outer dimension of the snap-fit hole and smaller than the outer dimension of the through hole; The connecting post is used to pass through the through hole and slide into the snap-fit hole through the connecting channel.
7. The projection device as described in claim 3, characterized in that, The lens front cover includes: a first ring body and a second ring body, and a side ring located between the first ring body and the second ring body in the axial direction of the sheath; the side of the side ring facing the sheath is connected to the outer ring edge of the first ring body, and the side of the side ring away from the sheath is connected to the inner ring edge of the second ring body; The first ring body is connected to the first pressure ring, the second ring body is connected to the first connecting ring, and at least a portion of the first ring body is located within the area enclosed by the first connecting ring.
8. The projection device as described in any one of claims 1 to 7, characterized in that, The projection device further includes: a second pressure ring and a plurality of connectors; the end of the sheath away from the projection lens has a second connecting ring, the second connecting ring protruding outward relative to the sheath; in the axial direction of the sheath, the second connecting ring is located between the second pressure ring and the outer shell; The plurality of connectors are used to connect the second pressure ring, the second connecting ring, and the housing.
9. The projection device as described in claim 8, characterized in that, The outer shell includes: a front cover plate and an outer shell body connected to each other, the front cover plate and the outer shell body forming the receiving cavity; the front cover plate has the light emission hole, and the side of the front cover plate opposite to the receiving cavity has a support groove, the support groove communicating with the light emission hole; At least a portion of the second pressure ring and the second connecting ring are located within the bearing groove.
10. The projection device as described in claim 8, characterized in that, The projection device further includes a light-transmitting protective lens, which is fixed to the side of the second pressure ring away from the protective sleeve.