A clearance structure of an infrared zoom lens

By using a staggered meshing of the main gear and the auxiliary gear, combined with a compression spring and a snap ring structure, the problem of gear transmission clearance in infrared zoom lenses is solved, achieving transmission continuity and stability in a compact space, and improving zoom and focusing effects.

CN224341725UActive Publication Date: 2026-06-09WUHAN GUIDE SENSMART TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
WUHAN GUIDE SENSMART TECH CO LTD
Filing Date
2025-06-25
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In infrared zoom lenses, the gear transmission clearance is relatively large, which affects the zoom and focusing effect. Conventional clearance-eliminating structures are not suitable for infrared zoom lenses with limited space.

Method used

By separating the main gear and the auxiliary gear and adjusting the misalignment of the gears, combined with the compression spring and snap ring structure, gear backlash is eliminated, ensuring the continuity and stability of the transmission.

Benefits of technology

It achieves continuous and stable gear transmission within a compact space, improves the zoom and focusing effects of infrared zoom lenses, and has a simple structure and high reliability.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224341725U_ABST
    Figure CN224341725U_ABST
Patent Text Reader

Abstract

This utility model relates to the field of infrared zoom lens technology, specifically to a backlash-eliminating structure for an infrared zoom lens. The structure includes: a motor assembly mounted on the infrared zoom lens; and a transmission gear located at the output end of the motor assembly. The transmission gear comprises a main gear and a secondary gear, with an adjustment component between them for adjusting the misalignment of the main and secondary gears. This backlash-eliminating structure for an infrared zoom lens eliminates gear backlash by dividing the transmission gear into a main gear and a secondary gear, and then using the adjustment component to make the main and secondary gears misaligned by a certain angle before meshing with the driven gear. This ensures the continuity and stability of the transmission between the transmission gear and the driven gear. The structure is simple and can be integrated into compact, space-constrained applications such as infrared zoom lenses.
Need to check novelty before this filing date? Find Prior Art

Claims

1. A gap-eliminating structure for an infrared zoom lens, relating to an infrared zoom lens (1), characterized in that, include: The motor assembly (2) is disposed on the outer wall of the infrared zoom lens (1); A transmission gear (3) is provided at the output end of the motor assembly (2), and the transmission gear (3) includes a main gear (301) and a secondary gear (302). An adjustment component is disposed between the main gear (301) and the secondary gear (302) for adjusting the misalignment of the main gear (301) and the secondary gear (302); The driven gear (4) is disposed on the outer wall of the infrared zoom lens (1) and meshes with the transmission gear (3).

2. The gap-eliminating structure of an infrared zoom lens according to claim 1, characterized in that, The motor assembly (2) includes a motor mounting base (202), which is mounted on the outer wall of the infrared zoom lens (1). A motor (201) is installed inside the motor mounting base (202), and the output end of the motor (201) is connected to the main gear (301).

3. The gap-eliminating structure of an infrared zoom lens according to claim 2, characterized in that, The output end of the motor (201) is provided with a main gear pressure block (305) for limiting the main gear (301).

4. The gap-eliminating structure of an infrared zoom lens according to claim 3, characterized in that, The adjustment assembly includes a main gear shaft (303), which is disposed on the side of the main gear (301) near the secondary gear (302). The secondary gear (302) is sleeved on the main gear shaft (303) and is rotatably connected to the main gear shaft (303). The adjustment assembly also includes a misalignment component for misaligning the secondary gear (302) with the primary gear (301).

5. The gap-eliminating structure of an infrared zoom lens according to claim 4, characterized in that, The misalignment component includes a first square groove (308), which is formed on the surface of the main gear (301) away from the motor assembly (2). A second square groove (309) is formed on the surface of the secondary gear (302) at a position corresponding to the first square groove (308). A compression spring (306) is provided in the space formed by the cooperation of the first square groove (308) and the second square groove (309).

6. The gap-eliminating structure of an infrared zoom lens according to claim 5, characterized in that, A snap ring groove (304) is provided on the main gear shaft (303), and a snap ring (307) is provided on the main gear shaft (303) at the position corresponding to the snap ring groove (304).

7. The gap-eliminating structure of an infrared zoom lens according to claim 2, characterized in that, One end of the motor mounting bracket (202) is in the shape of a clamp, used to fix the motor (201), and the other end is used to house the transmission gear (3) and is fixedly connected to the infrared zoom lens (1).

8. The gap-eliminating structure of an infrared zoom lens according to claim 3, characterized in that, The main gear (301) is provided with a limiting protrusion at the position corresponding to the main gear pressure block (305). The main gear pressure block (305) has a through hole, and the limiting protrusion has a threaded groove at the position corresponding to the fixing hole.

9. The gap-eliminating structure of an infrared zoom lens according to claim 5, characterized in that, The first square groove (308) and the second square groove (309) are provided in at least one set, and are centrally symmetrical on the main gear (301) and the auxiliary gear (302).

10. The gap-eliminating structure of an infrared zoom lens according to claim 6, characterized in that, The retaining ring (307) is a C-type retaining ring.