Lens module

Abstract

The invention discloses a lens module. The lens module comprises a lens barrel, a lens base and an elastic element, wherein the lens barrel comprises a coupling part and an extending part which are connected with each other sequentially; the outer diameter of the extending part is smaller than that of the coupling part; a first step surface is formed between the extending part and the coupling part; an outside thread is formed on the coupling part; a through hole for accommodating the lens barrel is formed in the lens base; an inside thread and a check ring close to the image end are arranged in the through hole; the check ring has a second step surface facing the object side; the inner diameter of the check ring is smaller than the outer diameter of the inside thread and larger than the outer diameter of the extending part; the outside thread on the lens barrel and the inside thread on the lens base are in loose fit with each other, so that the lens barrel and the lens base are not locked axially; the extending part extends out of the check ring; and the elastic element is pressed against the first step surface and the second step surface. In the lens module, by arranging the elastic element between the lens barrel and the lens base, the lens barrel and the lens base are fixed under the acting force of the elastic element and the lens module can focus easily.

Description

technical field [0001] The invention relates to an optical system, in particular to a lens module. Background technique [0002] With the development of camera technology, lens modules are widely used in camera devices for various purposes, among which fixed-focus lens modules are the favorite of camera professionals. A traditional fixed-focus lens module generally includes a lens barrel, a lens holder, a lens group housed in the lens barrel, a spacer ring, an optical filter, and the like. [0003] In a traditional fixed-focus lens module, the lens base and the lens barrel are tightly fitted and locked through threads, that is, through the thread fit, a locking force is formed between the lens barrel and the lens base. When focusing, the distance between the lens group in the lens module and the image sensor is generally adjusted by adjusting the focus ring, so that the lens module can obtain a better imaging effect. When assembling the lens module, align the first assembl...

AI Technical Summary

Problems solved by technology

The lens barrel and the lens holder and their assembly methods cause the following problems in the traditional lens module. In the thread fit and locking, there are generally different or uneven locking forces between different threads, which makes the lens barrel and The torque / torque between the lens mounts is not easy to control, that is, it is difficult to adjust the more precise position between the lens barrel and the lens mount

Therefore, it is difficult to quickly obtain a better focus position by simply adjusting the focus during focus adjustment, resulting in difficulty in focus adjustment

[0004] In addition, during the focusing process, the screw teeth of the lens base and the lens barrel may be worn due to mutual movement, and some debris will be formed. If these debris fall onto the image sensor located under the lens barrel, it will directly affect the The imaging effect of the lens module

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