Shading piece, preparation method thereof and lens structure

Abstract

The invention relates to a lens structure which comprises a lens barrel, a front lens and a rear lens, wherein a shading piece is arranged between the front lens and the rear lens, the shading piece comprises an annular first shading part located between the front lens and the rear lens and a second shading part connected with the inner side of the first shading part, and the second shading part is in a barrel shape. The second shading part extends from the inner side of the first shading part in the optical axis direction of the lens group in the direction close to the object side, and the aperture of the end, close to the first shading part, of the second shading part is larger than that of the end, away from the first shading part, of the second shading part. And the shading part obliquely extends towards the image side surface of the front lens, so that when the lens structure is applied to the camera module, the aim of shading all light rays emitted or reflected by the non-optical design area is fulfilled, and stray light is effectively eliminated and the imaging effect is ensured without the cost of shading the optical design area. The invention further provides an optical filter in the lens structure and a preparation method of the optical filter.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to an optical filter and a preparation method thereof, and has a lens structure of the optical filter. Background technique [0002] With the continuous improvement of users' requirements for imaging quality, the requirements for mobile phone cameras are becoming more and more stringent, especially for stray light, so that the extinction process of camera accessories is also constantly innovating and breaking through to improve stray light. [0003] In traditional mobile phone cameras, such as figure 1 As shown, the lens 820 is blocked by a flat and circular light-shielding sheet 810 to block some stray light other than normal imaging. However if figure 2 As shown, but when the gap between the lenses 820 is large and / or the refractive index of the lenses is large, the light-shielding sheet 810 still cannot completely cover the edges of the lenses, and at this time the lig...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to propose a lens structure for the problem that the shading film cannot effectively eliminate stray light

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