Self-locking lens and projection device

Abstract

The utility model belongs to the field of projection technical equipment, especially relates to a self-locking lens and projection equipment. Self-locking lens includes: outer tube, has the accommodation cavity, and the accommodation cavity has the opening, inner tube, through the opening portion sliding insertion accommodation cavity, and self-locking mechanism, including worm wheel, and the worm wheel engagement of worm and the rack that sets up in the inner tube outside surface and engages worm wheel, worm wheel is located in the accommodation cavity and rotation setting, and outer tube sets up the rotation hole that communicates the accommodation cavity, and one end of worm rotation setting is located in the rotation hole and rotates under the drive of external torque, to drive worm wheel rotation, to make worm wheel drive rack relative outer tube sliding, self-locking mechanism restricts the external force that acts on the inner tube, drives the inner tube relative outer tube sliding. The utility model can restrict the external force that acts on the inner tube directly drive the inner tube sliding, improve the stability and reliability of inner tube and outer tube positioning, avoid the inner tube sliding to the position shift of easy because of external force or collision after in place.

Description

Technical Field

[0001] This utility model belongs to the field of projection technology equipment, and in particular relates to a self-locking lens and projection equipment. Background Technology

[0002] Currently, a projector is an optoelectronic device that converts digital images or video signals into optical images and projects them onto a screen or wall. It is widely used in home entertainment, business presentations, education and training, and commercial exhibitions, and has become an important tool in modern life and work.

[0003] Projectors on the market typically employ a focusing mechanism that adjusts the focus by allowing the inner tube to slide and extend within the outer tube. Specifically, after the inner tube is inserted into the outer tube, the two are tightly connected through precise dimensional matching, effectively reducing shaking and ensuring image stability and focusing accuracy.

[0004] However, once the inner cylinder slides to the set position, its relative position to the outer cylinder is usually not fixed. If the inner cylinder is subjected to external force or accidental impact, it may slide relative to the outer cylinder, thereby affecting the projection effect and reducing the reliability of use. Utility Model Content

[0005] The purpose of this application is to provide a self-locking lens, which aims to solve the problem of improving the reliability of self-locking lens use.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] Firstly, a self-locking lens is provided, comprising:

[0008] An outer cylinder has a receiving cavity, and an opening communicating with the receiving cavity is provided on the surface of the outer cylinder;

[0009] The inner cylinder is slidably inserted into the receiving cavity through the opening portion; and

[0010] The self-locking mechanism includes a worm, a worm wheel meshing with the worm, and a rack located on the outer surface of the inner cylinder and meshing with the worm wheel. The worm wheel is located in the accommodating cavity and is rotatably disposed therein. The outer cylinder has a rotating hole communicating with the accommodating cavity. One end of the worm is rotatably disposed in the rotating hole and rotates under the drive of an external torque to drive the worm wheel to rotate, so that the worm wheel drives the rack to slide relative to the outer cylinder.

[0011] In some embodiments, a portion of the cavity wall of the accommodating cavity protrudes, and a mounting groove communicating with the accommodating cavity is formed on the inner side of the cavity wall. The rotating hole communicates with the mounting groove, and the worm gear is at least partially located in the mounting groove and rotatably connected to the groove wall of the mounting groove.

[0012] In some embodiments, the self-locking mechanism further includes a rotating shaft and a first bearing disposed on the rotating shaft, the two ends of the rotating shaft being respectively connected to the two side walls of the mounting groove, and the worm gear being connected to the first bearing.

[0013] In some embodiments, a second bearing is provided in the rotating hole, and one end of the worm gear passes through the second bearing.

[0014] In some embodiments, a limiting protrusion ring is further provided in the rotating hole, and two second bearings are arranged at intervals along the axial direction of the worm, with the two second bearings located on both sides of the limiting protrusion ring respectively.

[0015] In some embodiments, the rack includes rack teeth adapted to the worm gear, and a plurality of the rack teeth are arranged linearly and spaced apart along the axial direction of the inner cylinder.

[0016] In some embodiments, the self-locking lens assembly further includes a rolling element located in the receiving cavity, the two ends of the rolling element being rotatably connected to the outer cylinder, and the rolling element rolling against the outer surface of the inner cylinder, the surface of the rolling element against the inner cylinder being a rotating surface.

[0017] In some embodiments, the rolling element includes a rotating shaft rotatably connected to the outer cylinder and a rolling wheel connected to the rotating shaft and made of an elastic material, the rolling wheel abutting against the inner cylinder.

[0018] In some embodiments, multiple mounting slots are arranged at intervals along the circumference of the outer cylinder, and each mounting slot is provided with a rolling element, the two ends of which are rotatably connected to the two side walls of the mounting slot.

[0019] In a second aspect, a projection device is provided, which includes the self-locking lens, and the projection device further includes a bracket for connecting the self-locking lens.

[0020] The beneficial effects of this application are as follows: By setting a self-locking mechanism on the inner and outer cylinders, the worm gear meshes with the rack, and the worm meshes with the worm wheel. The worm can then indirectly drive the rack, ultimately causing the inner cylinder to slide relative to the outer cylinder. Utilizing the self-locking characteristic of the worm-worm wheel, external forces acting on the inner cylinder can be restricted from directly driving its sliding, thus improving the stability and reliability of the positioning of the inner and outer cylinders. This prevents the inner cylinder from easily shifting its position due to external forces or collisions after sliding into place, which could affect the projection effect. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the 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.

[0022] Figure 1 This is a three-dimensional structural diagram of the self-locking lens provided in an embodiment of this application;

[0023] Figure 2 yes Figure 1 A cross-sectional schematic diagram of a self-locking lens;

[0024] Figure 3 yes Figure 2 A magnified view of a portion of point A;

[0025] Figure 4 yes Figure 1 A schematic diagram of the explosion of a self-locking lens;

[0026] Figure 5 yes Figure 4 A three-dimensional structural diagram of the outer barrel of a self-locking lens.

[0027] The following are the labeling elements in the figure:

[0028] 100. Self-locking lens; 10. Outer cylinder; 20. Inner cylinder; 101. Bracket; 30. Self-locking mechanism; 31. Worm gear; 32. Rack; 33. Worm; 34. Knob; 35. Second bearing; 13. Rotating hole; 131. Limiting ring; 12. Mounting groove; 36. First bearing; 40. Rolling element; 41. Rotating shaft; 42. Roller; 111. Opening; 11. Receiving cavity; 321. Rack tooth; Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are for ease of description only, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0031] Please see Figures 1 to 3 This application provides a self-locking lens 100 and a projection device having the same.

[0032] Please see Figures 3 to 5 The self-locking lens 100 includes an outer cylinder 10, an inner cylinder 20, and a self-locking mechanism 30. Both the outer cylinder 10 and the inner cylinder 20 are hollow structures to accommodate related components. The inner cylinder 20 houses an optical assembly composed of multiple precision optical lenses used for focusing and imaging light. The cross-sections of the outer cylinder 10 and the inner cylinder 20 can be circular to ensure structural symmetry and assembly stability. The circular cross-sections also help reduce resistance during sliding, improving overall mechanical performance.

[0033] Please see Figures 3 to 5 The outer cylinder 10 has a receiving cavity 11 inside, and an opening 111 communicating with the receiving cavity 11 is formed on the surface of the outer cylinder 10. This opening 111 allows the inner cylinder 20 to be inserted into or slide out of the receiving cavity 11. The inner cylinder 20 is partially inserted into the receiving cavity 11 through the opening 111 and can slide freely and linearly along its axial direction within the outer cylinder 10, thereby achieving precise adjustment of the focal length of the optical components. By adjusting the relative positions of the inner cylinder 20 and the outer cylinder 10, the focal length of the optical lens can be changed to adapt to different projection requirements. The inner cylinder 20 can be smoothly inserted into the outer cylinder 10 through the opening 111 of the receiving cavity 11 to complete assembly, or pulled out of the receiving cavity 11 to achieve disassembly.

[0034] Please see Figures 3 to 5The self-locking mechanism 30 includes a worm 33, a worm wheel 31 meshing with the worm 33, and a rack 32 located on the outer surface of the inner cylinder 20 and meshing with the worm wheel 31. The worm 33 and rack 32 are respectively meshed at different positions on the worm wheel 31. The worm wheel 31 is located in the receiving cavity 11 and is rotatably disposed therein. The outer cylinder 10 has a rotating hole 13 communicating with the receiving cavity 11. One end of the worm 33 is rotatably disposed in the rotating hole 13 and rotates under the drive of an external torque to drive the worm wheel 31 to rotate, so that the worm wheel 31 drives the rack 32 to slide relative to the outer cylinder 10. The self-locking mechanism 30 restricts the external force acting on the inner cylinder 20 and drives the inner cylinder 20 to slide relative to the outer cylinder 10. That is, one end of the worm 33 is rotatably disposed in the rotating hole 13 and can rotate around its own axis. Its length direction is perpendicular to the sliding direction of the inner cylinder 20 when it is inserted into or pulled out of the receiving cavity 11.

[0035] Please see Figures 3 to 5 The worm 33 is driven to rotate by an externally applied torque. During rotation, it meshes with the worm wheel 31, causing the worm wheel 31 to rotate. The rotation of the worm wheel 31 causes the rack 32 to slide linearly, thereby driving the inner cylinder 20 to slide smoothly relative to the outer cylinder 10. It can be understood that the direction of rotation of the worm 33 under the action of torque determines the sliding direction of the inner cylinder 20. For example, clockwise rotation may cause the inner cylinder 20 to slide inward, while counterclockwise rotation will cause it to slide outward, thus achieving precise adjustment of the position of the inner cylinder 20 and thereby completing the dynamic adjustment of the focal length of the optical component.

[0036] It is also understandable that the worm gear 33 can drive the worm wheel 31 to rotate. However, when a force is applied to the inner cylinder 20, such as when the inner cylinder 20 is subjected to an unexpected impact, the worm gear 31 cannot drive the worm gear 33 to rotate. Therefore, the impact force or force acting on the inner cylinder 20 will not be able to drive the inner cylinder 20 to move relative to the outer cylinder 10. This means that the transmission setting based on the worm gear 33 and the worm wheel 31 can not only provide high-precision position control, but also effectively prevent the inner cylinder 20 from sliding unexpectedly due to external interference due to its self-locking characteristics, thereby improving the stability and reliability of the self-locking lens 100.

[0037] Please see Figures 3 to 5 In this embodiment, a self-locking mechanism 30 is provided on the inner cylinder 20 and the outer cylinder 10. A worm gear 31 meshes with a rack 32, and a worm 33 meshes with the worm gear 31. The worm 33 indirectly drives the rack 32, ultimately causing the inner cylinder 20 to slide relative to the outer cylinder 10. Utilizing the self-locking characteristic of the worm 33-worm gear 31, external forces acting on the inner cylinder 20 are prevented from directly driving its sliding, thus improving the stability and reliability of the positioning of the inner cylinder 20 and the outer cylinder 10. This prevents the inner cylinder 20 from shifting position due to external forces or collisions after sliding into place, which could affect the projection effect.

[0038] Understandably, one end of the worm 33 is exposed through the rotating hole 13. The self-locking mechanism 30 also includes a knob 34 located at the exposed end of the worm 33. The worm 33 can be rotated by manually driving the knob 34, thereby improving the ease of use.

[0039] Please see Figures 3 to 5 In some embodiments, a portion of the cavity wall of the receiving cavity 11 protrudes outward and forms a mounting groove 12 that communicates with the receiving cavity 11. The rotating hole 13 communicates with the mounting groove 12. The worm gear 31 is at least partially located in the mounting groove 12 and is rotatably connected to the groove wall of the mounting groove 12.

[0040] Optionally, the extension path of the mounting groove 12 is along the length or axial direction of the outer cylinder 10, and the worm gear 31 is partially received and rotatably disposed within the mounting groove 12, thereby providing the worm gear 31 with sufficient installation and movement space. The mounting groove 12 provides a compact installation environment, reduces the space occupied by the worm gear 31 within the receiving cavity 11, and makes the structure compact.

[0041] Understandably, one end of the mounting groove 12 extends to the opening 111 of the receiving cavity 11, thereby facilitating the installation and removal of the worm gear 31 or other components.

[0042] Please see Figures 3 to 5 In some embodiments, the self-locking mechanism 30 further includes a rotating shaft 37 and a first bearing 36 disposed on the rotating shaft 37. The two ends of the rotating shaft 37 are respectively connected to the two side walls of the mounting groove 12, and the worm gear 31 is connected to the first bearing 36.

[0043] Optionally, a positioning hole is provided at the center of the worm gear 31, and a first bearing 36 is installed in the positioning hole. A rotating shaft 37 passes through and connects to the inner ring of the first bearing 36, thereby enabling the worm gear 31 to rotate and connecting to the rotating shaft 37 through the first bearing 36, improving the smoothness of the rotation of the worm gear 31. The first bearing 36 can reduce the frictional resistance when the worm gear 31 rotates, ensuring its precise meshing with the worm 33 and rack 32, and reducing wear caused by long-term use.

[0044] Please see Figures 3 to 5 In some embodiments, a second bearing 35 is provided inside the rotating hole 13, and one end of the worm gear 33 passes through the second bearing 35.

[0045] Optionally, by providing a second bearing 35 within the rotating hole 13, with one end of the worm 33 enclosed by its inner ring, the second bearing 35 effectively reduces the frictional resistance between the rotating rod and the rotating hole 13, allowing the worm 33 to rotate smoothly and reducing its friction. This makes it easier for the user to operate the worm 33 and reduces wear on the worm 33 caused by friction. The second bearing 35 also constrains the radial offset of the worm 33, ensuring stable meshing between the worm 33 and the worm wheel 31.

[0046] Please see Figures 3 to 5 In some embodiments, a limiting protrusion ring 131 is also provided in the rotating hole 13. Along the axial direction of the worm 33, two second bearings 35 are arranged at intervals, and the two second bearings 35 are respectively located on both sides of the limiting protrusion ring 131.

[0047] Please see Figures 3 to 5 Optionally, by providing two spaced-apart second bearings 35, the positioning stability and rotational reliability of the worm 33 are enhanced. Increasing the support points reduces vibration and offset of the worm 33 during rotation, improving transmission smoothness. The limiting protrusion 131 effectively restricts the axial movement of the second bearing 35, providing axial positioning and preventing displacement or failure of the second bearing 35 during long-term use, thus ensuring the rotational reliability of the worm 33.

[0048] Please see Figures 3 to 5 In some embodiments, the rack 32 includes rack teeth 321 adapted to the worm gear 31, and the plurality of rack teeth 321 are arranged linearly and at intervals along the axial direction of the inner cylinder 20.

[0049] Optionally, it is understood that during the meshing of the rack 32 and the worm gear 31, the tooth profile and module of the rack 32 need to match the tooth profile of the worm gear 31, that is, the shape of the rack teeth 321 needs to match the teeth on the worm gear 31. For example, the worm gear 31 can use arc-shaped teeth, and the shape of the rack teeth 321 also needs to be adjusted accordingly to ensure smooth meshing between the rack 32 and the worm gear 31.

[0050] Understandably, because the worm gear 31 and worm 33 have a high reduction ratio, the rapid rotation of the worm 33 can be converted into the slow and high-precision linear movement of the rack 32, thereby improving the sliding adjustment accuracy of the inner cylinder 20 relative to the outer cylinder 10.

[0051] Please see Figures 3 to 5 In some embodiments, the self-locking lens assembly further includes a rolling element 40 located in the receiving cavity 11. The two ends of the rolling element 40 are rotatably connected to the outer cylinder 10, and the rolling element 40 rolls against the outer surface of the inner cylinder 20. The surface of the rolling element 40 that abuts against the inner cylinder 20 is a rotating surface.

[0052] Please see Figures 3 to 5 Optionally, the rotating surface is a curved surface formed by rotating a generatrix of a straight line or curve around a fixed axis. The rotating surface on the rolling element 40 can provide stable support for the inner cylinder 20, reduce the friction when the inner cylinder 20 and the outer cylinder 10 slide relative to each other, and improve the smoothness and convenience of assembly or disassembly between the inner cylinder 20 and the outer cylinder 10.

[0053] It is understandable that when the inner cylinder 20 slides relative to the outer cylinder 10, such as when the inner cylinder 20 is inserted into the receiving cavity 11, the surface of the rolling element 40 abuts against the inner cylinder 20, and under the drive of the inner cylinder 20, the rolling element 40 rotates around its rotation center, thereby changing the sliding friction between the inner cylinder 20 and the outer cylinder 10 into rolling friction between the rolling element 40 and the inner cylinder 20, reducing the contact area between the inner cylinder 20 and the outer cylinder 10, thereby reducing the friction between the inner cylinder 20 and the outer cylinder 10, and also improving the smoothness and stability of the sliding of the inner cylinder 20 relative to the outer cylinder 10.

[0054] Please see Figures 3 to 5 In some embodiments, the rolling element 40 includes a rotating shaft 41 rotatably connected to the outer cylinder 10 and a rolling wheel connected to the rotating shaft 41 and made of an elastic material, the rolling wheel abutting against the inner cylinder 20.

[0055] Optionally, the elastic material can be rubber or silicone. The elastic material gives the rolling wheel a certain degree of flexibility, allowing it to absorb minor vibrations or impacts when rolling, reducing wear and noise caused by hard contact. At the same time, micro-deformation increases the contact area and reduces local stress concentration.

[0056] Please see Figures 3 to 5 In some embodiments, multiple mounting grooves 12 are arranged at intervals along the circumference of the outer cylinder 10, and each mounting groove 12 is provided with a rolling element 40, the two ends of which are rotatably connected to the two side walls of the mounting groove 12.

[0057] Please see Figures 3 to 5 Optionally, multiple mounting slots 12 are arranged at intervals along the circumference of the outer cylinder 10, and each mounting slot 12 is equipped with a rolling element 40. Multiple rolling elements 40 are arranged at intervals along the length of either the inner cylinder 20 or the outer cylinder 10 within any mounting slot 12. The two ends of the rolling elements 40 are rotatably connected to the wall of the mounting slot 12, significantly enhancing the uniformity and stability of the circumferential support during the sliding of the inner cylinder 20. The circumferential distribution of multiple rolling elements 40 ensures that the inner cylinder 20 receives balanced support at multiple points during sliding, reducing localized stress concentration or instability caused by single-point contact.

[0058] This utility model also proposes a projection device, which includes a self-locking lens 100. The specific structure of the self-locking lens 100 is as described in the above embodiments. Since this projection device adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0059] In some embodiments, a projection device with a self-locking lens 100 can improve the convenience and reliability of the projection device during the focusing process. The projection device also includes a bracket 101 that connects to the self-locking lens 100. The bracket 101 is connected to the outer cylinder 10 and can support the self-locking lens 100, for example, to fix the self-locking lens 100.

[0060] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A self-locking lens (100), characterized in that, include: The outer cylinder (10) has a receiving cavity (11), and the surface of the outer cylinder (10) is provided with an opening (111) that communicates with the receiving cavity (11); The inner cylinder (20) is slidably inserted into the receiving cavity (11) through the opening (111); and The self-locking mechanism (30) includes a worm (33), a worm wheel (31) meshing with the worm (33), and a rack (32) opened on the outer surface of the inner cylinder (20) and meshing with the worm wheel (31); the worm wheel (31) is located in the accommodating cavity (11) and is rotatably arranged; the outer cylinder (10) has a rotating hole (13) communicating with the accommodating cavity (11); one end of the worm (33) is rotatably arranged in the rotating hole (13) to drive the worm wheel (31) to rotate, so that the worm wheel (31) drives the rack (32) to slide relative to the outer cylinder (10).

2. The self-locking lens (100) as described in claim 1, characterized in that: Part of the cavity wall of the accommodating cavity (11) protrudes, and an installation groove (12) communicating with the accommodating cavity (11) is formed on the inner side of the cavity wall. The rotating hole (13) communicates with the installation groove (12). The worm gear (31) is at least partially located in the installation groove (12) and is rotatably connected to the groove wall of the installation groove (12).

3. The self-locking lens (100) as described in claim 2, characterized in that: The self-locking mechanism (30) further includes a rotating shaft (37) and a first bearing (36) disposed on the rotating shaft (37). The two ends of the rotating shaft (37) are respectively connected to the two side walls of the mounting groove (12), and the worm gear (31) is connected to the first bearing (36).

4. The self-locking lens (100) as described in claim 1, characterized in that: A second bearing (35) is provided inside the rotating hole (13), and one end of the worm (33) passes through the second bearing (35).

5. The self-locking lens (100) as described in claim 4, characterized in that: The rotating hole (13) is also provided with a limiting protrusion ring (131). Along the axial direction of the worm (33), two second bearings (35) are arranged at intervals, and the two second bearings (35) are respectively located on both sides of the limiting protrusion ring (131).

6. The self-locking lens (100) as described in any one of claims 1-5, characterized in that: The rack (32) includes rack teeth (321) adapted to the worm gear (31), and a plurality of rack teeth (321) are arranged linearly and at intervals along the axial direction of the inner cylinder (20).

7. The self-locking lens (100) as described in any one of claims 2-3, characterized in that: The self-locking lens assembly also includes a rolling element (40) located in the accommodating cavity (11). The two ends of the rolling element (40) are rotatably connected to the outer cylinder (10), and the rolling element (40) rolls against the outer surface of the inner cylinder (20). The surface of the rolling element (40) that abuts against the inner cylinder (20) is a rotating surface.

8. The self-locking lens (100) as described in claim 7, characterized in that: The rolling element (40) includes a rotating shaft (41) rotatably connected to the outer cylinder (10) and a rolling wheel made of elastic material connected to the rotating shaft (41), the rolling wheel abutting against the inner cylinder (20).

9. The self-locking lens (100) as described in claim 7, characterized in that: Multiple mounting slots (12) are arranged at intervals along the circumference of the outer cylinder (10). Each mounting slot (12) is provided with a rolling element (40), and the two ends of the rolling element (40) are respectively rotatably connected to the two side walls of the mounting slot (12).

10. A projection device, characterized in that, Including the self-locking lens (100) as described in any one of claims 1-9, the projection device further includes a bracket (101) for connecting the self-locking lens (100).

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