A zoom objective lens structure that eliminates the need for the focusing wheel to return to its original position.

Abstract

This invention provides a zoom objective lens structure that eliminates the free return of the focusing handwheel, relating to the field of firearm sight technology. The structure includes a focusing handwheel assembly, a moving assembly, and a base assembly arranged sequentially along the optical axis. The rear end of the moving seat of the moving assembly is inserted into the annular cavity of the front housing of the base assembly and can move back and forth. Four springs are evenly arranged within the annular cavity, with their rear ends fixed to the light-blocking hole of the base assembly and their front ends abutting against the moving seat, providing a continuous preload to eliminate the meshing gap in the threaded connection between the moving seat and the connecting sleeve, thereby completely solving the problem of the focusing handwheel free return. This invention has a simple structure, few parts, and low processing and assembly costs, making it suitable for low-cost, mass production.

Description

Technical Field

[0001] This utility model relates to the field of firearm sight technology, specifically to a zoom objective lens structure that eliminates the need for the focusing handwheel to return to its original position. Background Technology

[0002] Adjustable-focus sights are mounted on firearms for observation and aiming. During observation and aiming, the focusing wheel needs to be rotated to adjust the objective lens's focal length, ensuring a clear image of the observed area. Therefore, the adjustment process needs to be more convenient, quick, and reliable. Traditional adjustable-focus sight objective lens structures employ high-precision machining and high-standard testing of the transmission chain components to address the issue of the focusing wheel returning to its original position, ensuring proper meshing and reducing return caused by poor meshing. This method places high demands on parts processing, technology, and inspection, resulting in long manufacturing cycles and high costs for adjustable-focus sight objectives, hindering low-cost, mass production. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a zoom objective lens structure that eliminates the free return of the focusing handwheel by applying a preload to the moving base, thereby eliminating the thread gap between the moving assembly and the connecting sleeve.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A zoom objective lens structure for eliminating the backlash of the focusing handwheel includes a focusing handwheel group, a moving group, and a base group arranged sequentially along the optical axis. The moving group includes a moving seat, and the base group includes a connecting seat. The tail end of the moving seat is inserted into the annular cavity of the front housing of the base group. The moving seat can move back and forth within the annular cavity. Four springs are evenly arranged within the annular cavity to provide preload force to the moving seat, thereby eliminating the meshing gap of the threaded connection.

[0005] Furthermore, the focusing handwheel assembly consists of an objective lens handwheel, a connecting sleeve, and a clamping ring. The connecting sleeve and the connecting seat are connected by a gap in the clamping ring, and the objective lens handwheel and the connecting sleeve are fixed together by screws to form a whole.

[0006] The movable base is provided with several lenses, the connecting base is located on the outer periphery of the movable base, and the movable base and the connecting sleeve are connected by threads.

[0007] Compared with existing technologies, the advantages of this invention are as follows: This invention features four springs evenly distributed between the base assembly and the movable seat, providing sufficient preload to eliminate meshing gaps in the threaded connection. The front end is physically pressed by the movable seat, ensuring the movable assembly is always under force, thus eliminating threaded gaps between the movable assembly and the connecting sleeve, completely solving the problem of backlash. This invention has a simple structure and fewer parts, significantly reducing processing difficulty and assembly costs, making it suitable for low-cost, mass production. The rear end of the springs is positioned within a light-blocking aperture, ensuring the light path is not obstructed and guaranteeing imaging quality. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a zoom objective lens structure that eliminates the need for the focusing wheel to return to its original position, according to this utility model.

[0009] Figure 2 This is a schematic diagram of the structure of the mobile assembly described in this utility model. Detailed Implementation

[0010] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.

[0011] See Figure 1-2 A zoom objective lens structure for eliminating the backlash of the focusing handwheel includes a focusing handwheel assembly 10, a moving assembly 20, and a base assembly 40 arranged sequentially from left to right along the optical axis. The moving assembly 20 includes a moving base 21, and the base assembly 40 includes a connecting base 41. The tail end of the moving base 21 is inserted into an annular cavity in the front housing of the base assembly. The moving base can move back and forth within the annular cavity. Four springs 30 are evenly arranged at 90° intervals within the annular cavity to provide preload force to the moving base 21. The rear end of the springs 30 is embedded in an open, light-blocking blind hole, and the front end abuts against the moving base 21, forming a continuous forward elastic preload force to eliminate the meshing gap of the threaded connection.

[0012] The focusing handwheel assembly 10 consists of an objective lens handwheel 11, a connecting sleeve 12, and a clamping ring 13. The connecting sleeve 12 and the connecting seat 41 are connected with a gap by the clamping ring 13. The objective lens handwheel 11 and the connecting sleeve 12 are fixed together by screws, forming a single unit. Specifically, the clamping ring 13 maintains a slight gap between the connecting sleeve 12 and the connecting seat 41, ensuring flexible rotation without wobbling. like Figure 2 As shown, a plurality of lenses are provided on the movable base 21, and the connecting base 41 is located on the outer periphery of the movable base 21. The movable base and the connecting sleeve are connected by threads. In this embodiment, the outer periphery of the movable base 21 is provided with external threads, which engage with the internal threads of the connecting sleeve 12. When the lens handwheel 11 is turned, the connecting sleeve 12 rotates synchronously, driving the movable base 21 and its lens group to move back and forth through the threaded pair, thereby realizing focal length adjustment.

[0013] Since the spring 30 always applies a forward preload to the moving seat 21, the meshing surfaces of the threaded pair always maintain contact on one side, thereby completely eliminating backlash and avoiding backlash.

Claims

1. A zoom objective lens structure that eliminates the need for the focusing manual wheel to return to its original position, characterized in that, It includes a focusing handwheel assembly, a moving assembly, and a base assembly arranged sequentially along the optical axis; the moving assembly includes a moving seat, and the base assembly includes a connecting seat. The tail end of the moving seat is inserted into the annular cavity of the front housing of the base assembly. The moving seat can move back and forth within the annular cavity, and four springs are evenly arranged within the annular cavity to provide preload for the moving seat, thereby eliminating the meshing gap of the threaded connection.

2. The zoom objective lens structure for eliminating the idle return of the focusing wheel according to claim 1, characterized in that, The focusing handwheel assembly consists of an objective lens handwheel, a connecting sleeve, and a clamping ring. The connecting sleeve and the connecting seat are connected by a gap in the clamping ring, and the objective lens handwheel and the connecting sleeve are fixed together by screws to form a whole.

3. The zoom objective lens structure for eliminating idle return of the focusing wheel according to claim 2, characterized in that, The movable base is provided with several lenses, the connecting base is located on the outer periphery of the movable base, and the movable base and the connecting sleeve are connected by threads.

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