A self-locking lens assembly and a projection device

Abstract

The utility model belongs to the technical field of projection equipment, especially, relate to a self -locking lens subassembly and projection equipment. Self -locking lens subassembly 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 and the worm mother strip of opening in the inner tube outside surface and engaging worm, worm is located in accommodation cavity and rotation setting, worm rotates under the drive of external moment, to drive the inner tube relative outer tube sliding, self -locking mechanism restricts the inner tube and drives worm to rotate through the worm mother strip. The utility model discloses through the self -locking characteristic of worm and worm mother strip, and the inner tube cannot drive worm rotation, restricts the accidental sliding of external force drive inner tube, carries out position locking after the inner tube sliding in place, has improved the positioning stability and use convenience of self -locking lens subassembly.

Description

Technical Field

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

[0002] Currently, a projector is an optoelectronic device that converts image or video signals into optical images and projects them onto a screen or wall. It is widely used in many fields such as home entertainment, business meetings, education and training, and commercial displays, and has become an indispensable practical tool in modern life and work.

[0003] Most projectors on the market today use a focusing mechanism that adjusts the focus by sliding the inner cylinder relative to the outer cylinder. Specifically, the inner cylinder is inserted into the outer cylinder, and the dimensions of the two are precisely matched to ensure a tight fit, effectively preventing shaking and helping to ensure stable imaging and accurate focusing.

[0004] However, after the inner cylinder slides into place relative to the outer cylinder, the relative positions of the inner and outer cylinders are generally not locked. When the inner cylinder is subjected to external force or accidental collision, the inner cylinder will slide relative to the outer cylinder, which will affect the projection and make it inconvenient to use. Utility Model Content

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

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

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

[0008] The outer cylinder has a receiving cavity with an opening;

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

[0010] The self-locking mechanism includes a worm and a worm nut bar formed on the outer surface of the inner cylinder and engaging the worm. The worm is located in the receiving cavity and is rotatably disposed. The worm rotates under the drive of an external torque to drive the inner cylinder to slide relative to the outer cylinder. The self-locking mechanism restricts the inner cylinder from driving the worm to rotate through the worm nut bar.

[0011] In some embodiments, the cavity wall of the receiving cavity is provided with a positioning groove, the worm portion is received and rotatably disposed in the positioning groove, and the exposed portion of the worm engages with the worm nut.

[0012] In some embodiments, the self-locking mechanism further includes an adapter seat fixedly disposed in the positioning groove, wherein two adapter seats are spaced apart, and the two adapter seats are respectively rotatably connected to the two ends of the worm gear.

[0013] In some embodiments, the self-locking lens assembly further includes a drive mechanism connected to the outer cylinder and used to drive the worm gear to rotate.

[0014] In some embodiments, the drive mechanism includes a first helical gear, a second helical gear meshing with the first helical gear, and a rotating rod. The first helical gear and the second helical gear are both located in the positioning groove. The first helical gear is connected to one end of the worm gear. The outer cylinder has a rotating hole communicating with the positioning groove. One end of the rotating rod passes through the rotating hole and is connected to the second helical gear. The other end of the rotating rod is exposed.

[0015] In some embodiments, the drive mechanism further includes a bearing located within the rotating hole, through which the rotating rod passes.

[0016] In some embodiments, two bearings are arranged at intervals, and the wall of the rotating hole is further provided with a limiting protrusion ring, which is located between the two bearings.

[0017] In some embodiments, the self-locking lens assembly further includes a rotating member located in the receiving cavity, the rotating member being rotatably connected to the outer cylinder, the rotating member abutting against the outer surface of the inner cylinder, and the surface of the rotating member abutting against the inner cylinder being a rotating surface.

[0018] In some embodiments, the rotating member 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.

[0019] In a second aspect, a projection device is provided, which includes the self-locking lens assembly.

[0020] The beneficial effects of this application are as follows: When the position of the inner cylinder needs to be adjusted, the inner cylinder can slide relative to the outer cylinder by driving the worm gear to rotate. After the inner cylinder is adjusted to the correct position, when the inner cylinder is subjected to external force or accidental impact, the self-locking characteristics of the worm gear and worm nut prevent the inner cylinder from driving the worm gear to rotate, thus limiting the external force from causing the inner cylinder to slide accidentally. After the inner cylinder slides to the correct position, the position is locked, improving the positioning stability and ease of use of the self-locking lens assembly. 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 schematic diagram of the self-locking lens assembly provided in the embodiments of this application;

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

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

[0025] Figure 4 yes Figure 1 An exploded diagram of a self-locking lens assembly.

[0026] The following are the labeling elements in the figure:

[0027] 100. Self-locking lens assembly; 10. Outer cylinder; 20. Inner cylinder; 40. Drive mechanism; 11. Receiving cavity; 53. Optical assembly; 51. Rotating component; 41. First helical gear; 42. Second helical gear; 43. Rotating rod; 44. Knob; 45. Bearing; 12. Positioning groove; 511. Roller; 512. Rotating shaft; 30. Self-locking mechanism; 31. Worm gear; 32. Worm nut; 33. Adapter; 331. Base plate; 332. Base; 13. Rotating hole; Detailed Implementation

[0028] 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.

[0029] 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.

[0030] Please see Figures 1 to 3 This application provides a self-locking lens assembly 100 and a projection device having the same.

[0031] Please see Figures 2 to 4 The self-locking lens assembly 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. The inner cylinder 20 can be used to house an optical assembly 53, which includes multiple optical lenses. The cross-sectional shape of both the inner cylinder 20 and the outer cylinder 10 can be circular.

[0032] Please see Figures 2 to 4 The outer cylinder 10 has a receiving cavity 11 with an opening. The inner cylinder 20 is slidably inserted into the receiving cavity 11 through the opening. By sliding the inner cylinder 20 relative to the outer cylinder 10, the focal length of the optical component 53 can be adjusted. Of course, by inserting the inner cylinder 20 into the receiving cavity 11 from the opening, the inner cylinder 20 and the outer cylinder 10 can be assembled, or the inner cylinder 20 can be pulled out of the receiving cavity 11, thus separating the inner cylinder 20 and the outer cylinder 10.

[0033] Please see Figures 2 to 4The self-locking mechanism 30 includes a worm gear 31 and a worm nut 32 formed on the outer surface of the inner cylinder 20 and engaging with the worm gear 31. The worm gear 31 is located in the receiving cavity 11 and is rotatably configured. The length direction of the worm gear 31 is the same as the direction in which the inner cylinder 20 is inserted into or pulled out of the receiving cavity 11. The worm gear 31 rotates under the drive of an external torque to drive the inner cylinder 20 to slide relative to the outer cylinder 10. It can be understood that the worm gear 31 can rotate under the action of torque. During the rotation, the worm gear 31 drives the inner cylinder 20 to slide through the worm nut 32. Changing the rotation direction of the worm gear 31 can change the sliding direction of the inner cylinder 20, thereby realizing the adjustment of the position of the inner cylinder 20 to adjust the focal length of the optical component 53.

[0034] Please see Figures 2 to 4 The self-locking mechanism 30 restricts the inner cylinder 20 from driving the worm 31 to rotate through the worm nut 32. That is, when the outer cylinder 10 is fixed, due to the self-locking characteristics of the worm nut and the worm, the external force acting on the inner cylinder 20 cannot drive the inner cylinder 20 to slide relative to the outer cylinder 10.

[0035] It is understandable that the rotation of the worm 31 can drive the inner cylinder 20 to slide relative to the outer cylinder 10 through the worm nut 32. When an external force is applied directly to the inner cylinder 20, due to the self-locking characteristic between the worm 31 and the worm nut 32, the worm nut 32 cannot drive the worm 31 to rotate. Thus, the inner cylinder 20 is locked in position through the meshing of the worm 31 and the worm nut 32. The relative movement between the inner cylinder 20 and the outer cylinder 10 can only be driven by the worm 31.

[0036] The self-locking lens assembly 100 provided in this application embodiment can slide the inner cylinder 20 relative to the outer cylinder 10 by driving the worm gear 31 to rotate when the position of the inner cylinder 20 needs to be adjusted. After the position of the inner cylinder 20 is adjusted to the correct position, when the inner cylinder 20 is subjected to external force or accidental impact, the self-locking characteristics of the worm gear 31 and the worm nut 32 prevent the inner cylinder 20 from driving the worm gear 31 to rotate, thus limiting the external force from driving the inner cylinder 20 to slide accidentally. After the inner cylinder 20 slides to the correct position, the position is locked, improving the positioning stability and ease of use of the self-locking lens assembly 100.

[0037] Please see Figures 2 to 4 In some embodiments, the cavity wall of the receiving cavity 11 is provided with a positioning groove 12, the worm 31 is partially received and rotatably disposed in the positioning groove 12, and the exposed part of the worm 31 engages with the worm nut 32.

[0038] Optionally, the positioning groove 12 connects to the receiving cavity 11, and the extension path of the positioning groove 12 is along the length direction of the outer cylinder 10. The worm gear 31 is partially received and rotatably disposed within the positioning groove 12, which optimizes the installation space and movement stability of the worm gear 31. The positioning groove 12 can provide a compact installation environment, reduce the space occupied by the worm gear 31 in the receiving cavity 11, and make the self-locking lens assembly 100 structurally compact.

[0039] Understandably, one end of the positioning groove 12 extends to the opening of the receiving cavity 11, thereby facilitating the installation and removal of the worm gear 31.

[0040] Please see Figures 2 to 4 In some embodiments, the self-locking mechanism 30 further includes an adapter 33 fixedly disposed in the positioning groove 12, with two adapters 33 spaced apart, and the two adapters 33 respectively rotatably connected to the two ends of the worm gear 31.

[0041] Optionally, the adapter 33 includes a base 332 with a U-shaped groove and a base plate 331 connected to the base 332. Two base plates 331 are respectively provided at both ends of the base 332. The two base plates 331 can be screwed to the outer cylinder 10 by screws. A bearing 45 is fixed in the U-shaped groove. One end of the worm gear 31 is inserted into the inner ring of the bearing 45, so that the worm gear 31 can be rotated in the positioning groove 12 through the two adapters 33.

[0042] Please see Figures 2 to 4 In some embodiments, the self-locking lens assembly 100 further includes a drive mechanism 40 connected to the outer cylinder 10 and used to drive the worm gear 31 to rotate.

[0043] Optionally, the drive mechanism 40 can drive the worm gear 31 to rotate manually or electrically, and then drive the inner cylinder 20 to slide relative to the outer cylinder 10 through the worm nut 32, converting the external operation into the linear sliding of the inner cylinder 20, thereby improving the accuracy of focusing and the efficiency of operation.

[0044] Please see Figures 2 to 4 In some embodiments, the drive mechanism 40 includes a first helical gear 41, a second helical gear 42 meshing with the first helical gear 41, and a rotating rod 43. The first helical gear 41 and the second helical gear 42 are both located in the positioning groove 12. The first helical gear 41 is connected to one end of the worm gear 31. The outer cylinder 10 has a rotating hole 13 that communicates with the positioning groove 12. One end of the rotating rod 43 passes through the rotating hole 13 and is connected to the second helical gear 42. The other end of the rotating rod 43 is exposed.

[0045] Optionally, by applying an external torque to the exposed end of the rotating rod 43, the power of the rotating rod 43 can be transmitted to the worm gear 31 through the meshing of the first helical gear 41 and the second helical gear 42. A knob 44 can also be provided at the exposed end of the rotating rod 43, allowing the worm gear 31 to rotate by manual operation, thus improving user convenience.

[0046] It is understandable that the meshing of the first helical gear 41 and the second helical gear 42 has the following characteristics:

[0047] Smooth meshing: The contact line of the tooth surface of helical gears is oblique, and the teeth gradually enter and exit the mesh, reducing impact and vibration, making the transmission smoother.

[0048] High load-bearing capacity: Due to the long contact line and large overlap of helical gears, multiple teeth participate in meshing at the same time, resulting in a more uniform load distribution and thus improving the load-bearing capacity of the gears.

[0049] Low noise and vibration: The gentle contact of helical gears reduces noise and vibration, with noise levels decreasing by 5-10 dB.

[0050] Please see Figures 2 to 4 In some embodiments, the drive mechanism 40 further includes a bearing 45 located within the rotating hole 13, through which the rotating rod 43 passes.

[0051] Optionally, by providing a bearing 45 within the rotating hole 13, the rotating rod 43 can rotate smoothly, reducing friction and improving its durability. Since the bearing 45 effectively reduces the frictional resistance between the rotating rod 43 and the rotating hole 13, it requires less effort from the user when operating the rotating rod 43, while also reducing wear caused by friction. The bearing 45 also constrains the radial offset of the rotating rod 43, ensuring stable meshing between the second helical gear 42 and the first helical gear 41, thereby improving the transmission accuracy and reliability of the drive mechanism 40.

[0052] Please see Figures 2 to 4 In some embodiments, two bearings 45 are arranged at intervals, and the wall of the rotating hole 13 is also provided with a limiting protrusion ring, which is located between the two bearings 45.

[0053] Optionally, by providing two spaced-apart bearings 45, the positioning stability and rotational reliability of the rotating rod 43 are enhanced. Increasing the support points reduces vibration and offset of the rotating rod 43 during rotation, improving transmission smoothness. The limiting ring effectively restricts the axial movement of the bearing 45, providing axial positioning and preventing displacement or failure of the bearing 45 during long-term use, thus ensuring the reliability of the rotating rod 43's rotation.

[0054] Please see Figures 2 to 4 In some embodiments, the self-locking lens assembly 100 further includes a rotating member 51 located in the receiving cavity 11. The rotating member 51 is rotatably connected to the outer cylinder 10, and the rotating member 51 abuts against the outer surface of the inner cylinder 20. The surface of the rotating member 51 abutting against the inner cylinder 20 is a rotating surface.

[0055] Optionally, by making the rolling surface of the rotating member 51 a rotating surface, the rotating member 51 is rotatably connected to the outer cylinder 10 or the inner cylinder 20, and its rolling surface abuts against the outer surface of the inner cylinder 20, the frictional force when the inner cylinder 20 and the outer cylinder 10 slide relative to each other can be reduced, thereby improving the smoothness and convenience of assembly or disassembly between the inner cylinder 20 and the outer cylinder 10.

[0056] Please see Figures 2 to 4 When the inner cylinder 20 slides relative to the outer cylinder 10, for example when the inner cylinder 20 is inserted into the receiving cavity 11, the rolling surface of the rotating member 51 abuts against the inner cylinder 20, and under the drive of the inner cylinder 20, the rotating member 51 rotates around its rotation center, thereby changing the sliding friction between the inner cylinder 20 and the outer cylinder 10 into the rolling friction between the rotating member 51 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 of the sliding of the inner cylinder 20 relative to the outer cylinder 10.

[0057] Please see Figures 2 to 4 In some embodiments, the rotating member 51 includes a rotating shaft 512 rotatably connected to the outer cylinder 10 and a rolling wheel 511 connected to the rotating shaft 512 and made of an elastic material, the rolling wheel 511 abutting against the inner cylinder 20.

[0058] Optionally, the elastic material can be rubber or silicone. The elastic material gives the rolling wheel 511 a certain degree of flexibility, which can absorb minor vibrations or impacts during rolling, reduce wear and noise caused by hard contact, and increase the contact area through micro-deformation to reduce local stress concentration.

[0059] It is understandable that two rotating parts 51 are provided in the positioning groove 12, and the worm gear 31 is located between the two rotating parts 51, thereby improving the ease of sliding of the inner cylinder 20.

[0060] In some embodiments, multiple positioning grooves 12 are arranged circumferentially around the outer cylinder 10, and each positioning groove 12 is provided with a rotating member 51, and multiple rotating members 51 can be arranged at intervals in the positioning groove 12.

[0061] Please see Figures 2 to 4Optionally, multiple positioning grooves 12 are arranged along the circumference of the outer cylinder 10, which can improve the uniformity and stability of the circumferential support of the inner cylinder 20, so that multiple rotating parts 51 are evenly distributed in the circumference of the outer cylinder 10, and the inner cylinder 20 is subjected to balanced support forces in multiple directions when sliding, avoiding tilting or shaking problems caused by unidirectional support.

[0062] Please see Figures 2 to 4 The present invention also proposes a projection device, which includes a self-locking lens assembly 100. The specific structure of the self-locking lens assembly 100 is as described in the above embodiments. Since the 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.

[0063] Understandably, a projection device with a self-locking lens assembly 100 can improve the convenience and reliability of the projection device during the focusing process.

[0064] 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 assembly (100), characterized in that, include: The outer cylinder (10) has a receiving cavity (11) with an opening; The inner cylinder (20) is slidably inserted into the receiving cavity (11) through the opening portion; and The self-locking mechanism (30) includes a worm (31) and a worm nut (32) formed on the outer surface of the inner cylinder (20) and engaging the worm (31). The worm (31) is located in the receiving cavity (11) and is rotatably disposed. The worm (31) rotates under the drive of an external torque to drive the inner cylinder (20) to slide relative to the outer cylinder (10). The self-locking mechanism (30) restricts the inner cylinder (20) from driving the worm (31) to rotate through the worm nut (32).

2. The self-locking lens assembly (100) as described in claim 1, characterized in that: The cavity wall of the accommodating cavity (11) is provided with a positioning groove (12), the worm (31) is partially received and rotatably disposed in the positioning groove (12), and the exposed part of the worm (31) engages with the worm mother bar (32).

3. The self-locking lens assembly (100) as described in claim 2, characterized in that: The self-locking mechanism (30) also includes a transition seat (33) fixedly disposed in the positioning groove (12). Two transition seats (33) are spaced apart, and the two transition seats (33) are respectively rotatably connected to the two ends of the worm (31).

4. The self-locking lens assembly (100) as described in any one of claims 1-3, characterized in that: The self-locking lens assembly (100) also includes a drive mechanism (40) that connects to the outer cylinder (10) and is used to drive the worm gear (31) to rotate.

5. The self-locking lens assembly (100) as described in claim 4, characterized in that: The drive mechanism (40) includes a first helical gear (41), a second helical gear (42) meshing with the first helical gear (41), and a rotating rod (43). The first helical gear (41) and the second helical gear (42) are both located in the positioning groove (12). The first helical gear (41) is connected to one end of the worm gear (31). The outer cylinder (10) has a rotating hole (13) that communicates with the positioning groove (12). One end of the rotating rod (43) passes through the rotating hole (13) and is connected to the second helical gear (42). The other end of the rotating rod (43) is exposed.

6. The self-locking lens assembly (100) as described in claim 5, characterized in that: The drive mechanism (40) also includes a bearing (45) located in the rotating hole (13), through which the rotating rod (43) passes.

7. The self-locking lens assembly (100) as described in claim 6, characterized in that: Two bearings (45) are arranged at intervals, and the wall of the rotating hole (13) is also provided with a limiting protrusion ring, which is located between the two bearings (45).

8. The self-locking lens assembly (100) as described in any one of claims 1-3, characterized in that: The self-locking lens assembly (100) also includes a rotating member (51) located in the accommodating cavity (11). The rotating member (51) is rotatably connected to the outer cylinder (10). The rotating member (51) abuts against the outer surface of the inner cylinder (20), and the surface of the rotating member (51) abutting against the inner cylinder (20) is a rotating surface.

9. The self-locking lens assembly (100) as described in claim 8, characterized in that: The rotating component (51) includes a rotating shaft (512) rotatably connected to the outer cylinder (10) and a rolling wheel (511) connected to the rotating shaft (512) and made of elastic material, the rolling wheel (511) abutting against the inner cylinder (20).

10. A projection device, characterized in that, Includes the self-locking lens assembly (100) as described in any one of claims 1-9.

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