External lens shutter of projector
By designing an external lens shading device, the rotation adjustment of the fixture stand and the light-shading panel assembly is solved, the stray light problem in the projector is improved, and the contrast performance is suitable for most projector shapes, achieving a stable light shading effect.
Patent Information
- Application Number
- CN202323393703.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-12
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2033-12-12
AI Technical Summary
Stray light caused by light reflection and refraction in projectors is difficult to effectively suppress, affecting the picture contrast. The prior art adds internal optical system components or uses black tape to block the edge of the lens, but the effect is unstable, and it may be difficult to generally apply.
Design an external lens light shield, including a fixture stand, a frame base and a light shield assembly, which is fixed to the projector housing through the fixture stand, and the frame base surrounds the lens, and the light shield is adjusted to block the edge light by rotation, using The elastic components and light shielding layer achieve stable fixation and shading.
It realizes effective occlusion of light at the edge of the projector lens, improves the contrast performance of the picture, is suitable for most projector shapes, and does not increase manufacturing cost, and the stability is less affected by temperature.
Smart Images
Figure CN222365169U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of projection equipment, in particular to an external lens shader of a projector. Background Art
[0002] The light in the projector is reflected and refracted many times from the light source, which easily produces stray light. After it is finally projected by the projector lens, it is easy to form light leakage at the edge of the picture, affecting the contrast of the picture, especially the dark field image quality of the projector.
[0003] Therefore, in order to reduce the dark field brightness of the picture and improve the contrast performance, an aperture is usually added to the internal optical system of the projector to block the light at the edge of the lens. However, adding components requires changing the design, increasing manufacturing costs, and cannot improve the light leakage of existing projector products. In reality, engineers also directly use black tape to block the edge of the lens to block stray light; the adhesion of black tape is greatly affected by temperature and is prone to fall off over time.
[0004] Therefore, it is necessary to design a new type of projector that does not change the internal structure of the existing projector, does not increase the manufacturing cost, can be generally applicable to most projector lens stray light solutions, and can continuously and stably overcome the above defects. Utility Model Content
[0005] The utility model aims to provide an external lens shader for a projector, which can solve the above problems.
[0006] To achieve the above-mentioned purpose, the utility model provides an external lens sunshade for a projector, which comprises a first clamp frame, a second clamp frame, a frame-shaped base and a plurality of sunshade plate assemblies; the frame-shaped base is fixed to the first clamp frame and the second clamp frame; each of the sunshade plate assemblies comprises a rotatably connected sunshade plate and a connecting plate, and the connecting plate is fixed to the frame-shaped base; wherein the first clamp frame and the second clamp frame are used to be respectively clamped to the projector housing on the first side and the projector housing on the second side opposite to the projector lens, so that the frame-shaped base surrounds and exposes the projector lens, and the sunshade plate is used to be adjusted to block the edge light of the projector lens.
[0007] Preferably, the first clamp frame includes a first clamp frame body and a first adjusting member; the first clamp frame body is U-shaped, and the first clamp frame body includes a first section, a third section and a second section which are sequentially connected and integrally formed, and the first section, the second section and the third section correspond one-to-one with the projector housing on the first side, the projector housing on the second side and the third side respectively; the first adjusting member includes a first operating end, a first rod and a first abutting end which are sequentially connected, wherein the first rod passes through and is threadedly coupled to the first threaded hole of the first section, the first operating end is used to adjust the position of the first rod relative to the first section, and the first abutting end is used to abut against the projector housing on the first side.
[0008] Preferably, the first clamp frame also includes a second adjusting member, wherein the second adjusting member includes a second operating end, a second rod and a second abutting end connected in sequence, wherein the second rod passes through and is threadedly coupled to the second threaded hole of the second section, the second operating end is used to adjust the position of the second rod relative to the second section, and the second abutting end is used to abut against the projector housing on the second side.
[0009] Preferably, the first clamp frame further includes an elastic portion, and the elastic portion is disposed on the first surface side of the second section facing the projector.
[0010] Preferably, the elastic part is an elastic foam block or an elastic rubber block.
[0011] Preferably, the first abutting end includes a bell-mouth end and an elastic portion, and the elastic portion is arranged on an end side of the bell-mouth end.
[0012] Preferably, the elastic part is an elastic foam block or an elastic rubber block.
[0013] Preferably, the frame base is locked, snapped or welded to the first fixture frame body and the second fixture frame body of the second fixture frame; or, the frame base is integrally formed with the first fixture frame body and the second fixture frame body of the second fixture frame.
[0014] Preferably, the shading plate is rotationally connected to the connecting plate based on at least one damping rotation axis, so that after the shading plate is operated to rotate to a certain angle, the shading plate is suspended and fixed relative to the frame-shaped base.
[0015] Preferably, the surface of each shading plate has a shading layer, and the shading layer is any one of the following: a shading coating layer, a shading coating layer, and a black velvet cloth layer.
[0016] Compared with the prior art, the external shading device provided by the utility model is fixed by the clamp frame to achieve stable fixation of the shading device and the projector; and the shading plate rotatably arranged on the frame base is adjusted to block the edge stray light of the corresponding side of the projector lens by adjusting the rotation angle of the shading plate. The external shading device provided by the utility model is applicable to most shapes of projectors and lenses, and this structure is also less affected by temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the structure of the external lens shutter of the first embodiment of the utility model being assembled on a projector;
[0018] Figure 2 It is a structural schematic diagram of the first clamp frame of the first embodiment of the utility model;
[0019] Figure 3 It is a structural schematic diagram of a sunshade assembly according to a second embodiment of the utility model. DETAILED DESCRIPTION
[0020] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.
[0021] Certain words are used in the specification and claims to refer to specific components. Those with ordinary knowledge in the field should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but rather use differences in components' functions as the criteria for distinction. The term "including" mentioned throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to".
[0022] Reference Figures 1 to 3 As shown, a schematic structural diagram of a first embodiment of an external lens shade of a projector of the utility model is disclosed, wherein the external lens shade 2 comprises a first fixture frame 21, a second fixture frame 22, a frame-shaped base 23 and a plurality of shading plate assemblies 24. The frame-shaped base 23 is fixed to the first fixture frame 21 and the second fixture frame 22, and the shading plate assembly 24 comprises a shading plate 241 and a connecting plate 242 which are rotatably connected, wherein the connecting plate 242 is fixed to the frame-shaped base 23.
[0023] The projector 1 includes a housing 11 and a projector lens 12, as well as internal light source, optical processing and other modules. Figure 1As shown, for example, the projector lens 12 is disposed on one side of the projector housing 11 and projects an image toward the side. The projector housing 11 includes a first portion 111 and a second portion 112, which are respectively located on the first side (y direction side) and the second side (-y direction side) of the projector lens 12. The first clamp frame 21 and the second clamp frame 22 are both clamped on the housing 111 and the housing 112, and are respectively located on the third side (x direction side) and the fourth side (-x direction side) of the projector lens 12. In other words, the first clamp frame 21 and the second clamp frame 22 are clamped on the projector housing 1 in parallel and are respectively located on the opposite sides of the projector lens, so that the frame-shaped base 23 surrounds and exposes the projector lens 12, and the projector lens 12 projects an image from the central opening of the frame-shaped base 23. The plurality of shading plates 241 are adjusted to block part of the edge light of the projector lens 12 as needed, thereby improving the light leakage problem on the corresponding sides.
[0024] In a preferred embodiment, if Figure 1 and Figure 2 As shown, the first clamp frame 21 includes a first clamp frame body 211 and a first adjustment member 212. The first clamp frame body 211 is U-shaped and includes a first section 211a, a third section 211c and a second section 211b that are connected in sequence and integrally formed. The first section 211a, the second section 211b and the third section 211c correspond to the projector housing 111 on the first side, the projector housing 112 on the second side and the third side (x direction side) of the projector lens 12. The first adjustment member 212 includes a first operating end 212a, a first rod 212c and a first abutting end 212b that are connected in sequence, wherein the first rod 212c is penetrated and threadedly coupled to the first threaded hole of the first section 211a, the first operating end 212a is used to adjust the position of the first rod 212c relative to the first section 211a, and the first abutting end 212 is used to abut against the projector housing 111 on the first side. Thus, the first section 211a and the second section 211b of the first clamp frame body 211 are fixed to the housing 11 near the projector lens 12 by the first adjusting member 212. Preferably, the first abutting end 212b includes a bell mouth end 212b1 and an elastic portion 212b2, and the elastic portion 212b2 is arranged at the end side of the bell mouth end 212b1. The elastic portion is, for example, an elastic foam block, an elastic rubber block, etc., which is convenient for firm fixation without damaging the surface of the housing 11.
[0025] In one embodiment, an elastic portion is further provided on one side of the second section 211b facing the projector housing, and the elastic portion and the first abutting end 212 of the first adjusting member 212 are respectively clamped on the housings 111 and 112 near the projector lens 12 to fix the first clamp frame 21. The elastic portion is, for example, an elastic foam block, an elastic rubber block, etc., which is convenient for firm fixation without damaging the surface of the housing 11.
[0026] In another embodiment, if Figure 2 As shown, the first clamp frame 21 also includes a second adjustment member 213, whose structure is similar to that of the first adjustment member 212. Specifically, the second adjustment member includes a second operating end, a second rod, and a second abutting end connected in sequence. The second rod is threadedly coupled to the second threaded hole of the second section, the second operating end is used to adjust the position of the second rod relative to the second section, and the second abutting end is used to abut against the projector housing 112 on the second side. Preferably, the second abutting end is similar in structure to the first abutting end 212, and will not be described in detail. The structure of the second clamp frame 22 is the same as that of the first clamp frame 21 in any of the above embodiments, and will not be described in detail here.
[0027] The frame base 23 is a frame-shaped component with an opening in the middle, and the frame base 23 is, for example, rectangular, square, circular, etc. Preferably, the frame base 23 is rectangular or square, so that the frame base 23 can be fixed by multi-point locking, clamping or welding, so as to be more stably fixed to the first clamp frame body 211 and the second clamp frame body of the second clamp frame 22. In other embodiments, the frame base 23 can also be integrally formed with the first clamp frame body 211 and the second clamp frame body of the second clamp frame 22. In other words, when the frame base 23 is rectangular or square, the two parallel opposite sides of the frame base 23 extend to both ends respectively and bend to the same side to form a U-shaped structure projected on the yz plane, and the two ends of the extension part are combined with one of the opposite sides to form the aforementioned U-shaped first clamp frame body 211, and the two ends of the extension part are combined with the other opposite side to form the aforementioned U-shaped second clamp frame body.
[0028] In this embodiment, the sunshade assembly 24 is one, such as Figure 1 As shown. In other embodiments, the shading plate assemblies 24 on the corresponding sides can also be assembled according to needs; for example, only a group of two shading plate assemblies 24 on opposite sides are assembled to block the edge light of the same dimension of the picture; or the shading plate assemblies 24 can be assembled on the four frames of the frame-shaped base 23, but the present invention is not limited to this. In each shading plate assembly 24, the shading plate 241 is connected to the connecting plate 242 by a rotating shaft 243. The connecting plate 242 is fixed to the frame-shaped base 23 by locking, snapping or welding. As shown Figure 1 and 3 As shown, the connecting plate 242 is provided with threaded holes H1, and the frame base 23 is provided with corresponding threaded holes. The threaded holes H1 on the connecting plate 242 and the corresponding threaded holes on the frame base 23 are coupled simultaneously by screws to achieve relative fixation, but the present invention is not limited thereto.
[0029] In a preferred embodiment, the rotating shaft 243 is a damping rotating shaft 243, so that after the shading plate 241 is operated and rotated to a certain angle, the shading plate 241 can be suspended and fixed relative to the connecting plate 242, or relative to the assembled frame base. Figure 3 As shown, the rotation axis 243 can be one, in which case the middle section of the adjacent part of the shading plate 241 and the connecting plate 242 is coupled based on the rotation axis 243, or the entire adjacent part of the shading plate 241 and the connecting plate 242 is coupled based on the rotation axis 243. The rotation axis 243 can also be multiple, for example, the two ends of the adjacent part of the shading plate 241 and the connecting plate 242 are coupled based on the rotation axis 243, and on this basis, the middle section of the adjacent part of the shading plate 241 and the connecting plate 242 is also coupled based on the rotation axis 243, and at this time at least one of the multiple rotation axes 243 is a damping rotation axis 243 to facilitate the operation of adjusting the degree of shading.
[0030] In another embodiment, the shading plate 241 further has a first fixing plate, and the connecting plate 242 further has a second fixing plate, the first fixing plate and the second fixing plate are substantially perpendicular to the axial direction of the rotating shaft 243, wherein the first fixing plate has a first arc-shaped hole, the second fixing plate has a second arc-shaped hole, and the first arc-shaped hole and the second arc-shaped hole have the same radius, and when the shading plate 241 moves relatively to a suitable angle, a screw is passed through the first arc-shaped hole and the second arc-shaped hole, and is locked with a nut to achieve the fixing of the shading plate 241 relative to the connecting plate 242. One of the first arc-shaped hole and the second arc-shaped hole can be a circular hole, but the utility model is not limited thereto.
[0031] In another embodiment, the rotation shaft 243 is fixed relative to the connecting plate 242, and the light shielding plate 241 has a tube portion sleeved on the rotation shaft 243, and a screw hole is provided on the tube portion. A screw is engaged with the screw hole and abuts against the rotation shaft 243 to achieve the fixation of the light shielding plate 241 relative to the connecting plate 242. In other embodiments, the rotation shaft 243 is fixed relative to the light shielding plate 241, and the tube portion with the screw hole is provided on the connecting plate, but the utility model is not limited thereto.
[0032] In this embodiment, at least one side of the shading plate 241 facing the opening of the frame-shaped base 23 has a shading layer; the shading layer can be a shading film layer or a shading coating layer, which can be formed by metal anode surface treatment or spray painting; the first shading layer 211d can also be a black velvet cloth layer, but the utility model is not limited thereto. In other embodiments, the entire surface of the shading plate 241 can be covered with a shading layer. In addition, the surfaces of the first clamp frame 21, the second clamp frame 22 and the frame-shaped base 23 can also have a shading layer, but the utility model is not limited thereto.
[0033] In summary, the utility model provides an external shading device, which is fixed by a clamp frame to achieve stable fixation of the shading device and the projector; and then, by adjusting the rotation angle of the shading plate, the shading plate is rotatably arranged on the frame base to block the edge stray light corresponding to the side of the projector lens. The external shading device can be suitable for the shapes of most projectors and lenses, and is not easily changed or adjusted due to high-temperature environments.
[0034] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, any changes and modifications made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.
Claims
1. An external lens shutter for a projector, characterized in that: It comprises a first clamp frame, a second clamp frame, a frame base and a plurality of shading plate assemblies; the frame base is fixed to the first clamp frame and the second clamp frame; each of the shading plate assemblies comprises a rotatably connected shading plate and a connecting plate, the connecting plate being fixed to the frame base; wherein the first clamp frame and the second clamp frame are used to be respectively clamped to a projector housing on a first side and a projector housing on a second side opposite to a projector lens, so that the frame base surrounds and exposes the projector lens, and the shading plate is used to be adjusted to block edge light of the projector lens.
2. The external lens shutter of a projector as claimed in claim 1, characterized in that: The first clamp frame includes a first clamp frame body and a first adjusting member; The first clamp frame body is U-shaped, and the first clamp frame body includes a first section, a third section and a second section which are sequentially connected and integrally formed, the first section, the second section and the third section respectively correspond to the projector housing on the first side, the projector housing on the second side and the third side, wherein the third side is respectively adjacent to the first side and the second side, and is adjacent to the projector lens; The first adjustment member includes a first operating end, a first rod and a first abutting end connected in sequence, wherein the first rod passes through and is threadedly coupled to the first threaded hole of the first section, the first operating end is used to adjust the position of the first rod relative to the first section, and the first abutting end is used to abut against the projector housing on the first side.
3. The external lens shutter of a projector as claimed in claim 2, characterized in that: The first clamp frame also includes a second adjusting member, wherein the second adjusting member includes a second operating end, a second rod and a second abutting end connected in sequence, wherein the second rod passes through and is threadedly coupled to the second threaded hole of the second section, the second operating end is used to adjust the position of the second rod relative to the second section, and the second abutting end is used to abut against the projector housing on the second side.
4. The external lens shutter of a projector as claimed in claim 2, characterized in that: The first clamp frame further includes an elastic portion, and the elastic portion is disposed on a first surface side of the second section facing the projector.
5. The external lens shutter of a projector as claimed in claim 4, characterized in that: The elastic part is an elastic foam block or an elastic rubber block.
6. The external lens shutter of a projector according to claim 2 or 3, characterized in that: The first abutting end includes a bell-mouth end and an elastic portion, and the elastic portion is arranged on an end side of the bell-mouth end.
7. The external lens shutter of a projector as claimed in claim 6, characterized in that: The elastic part is an elastic foam block or an elastic rubber block.
8. The external lens shutter of a projector as claimed in claim 2, characterized in that: The frame base is locked, snapped or welded to the first fixture frame body and the second fixture frame body of the second fixture frame; or the frame base is integrally formed with the first fixture frame body and the second fixture frame body of the second fixture frame.
9. The external lens shutter of a projector as claimed in claim 1, characterized in that: The shading plate is rotationally connected to the connecting plate based on at least one damping rotation axis, so that after the shading plate is operated to rotate to a certain angle, the shading plate is suspended and fixed relative to the frame-shaped base.
10. The external lens shutter of a projector as claimed in claim 1, characterized in that: The surface of each shading plate is provided with a shading layer, and the shading layer is any one of the following: a shading film layer, a shading coating layer and a black velvet cloth layer.