Optical imaging system

Abstract

The invention discloses an optical imaging system. The optical imaging system is of a seven-piece aspheric surface structure. The system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an infrared filter and an image sensor which are sequentially arranged from an object side to an image side; the first lens has positive diopter; the second lens has negative diopter; the third lens has positive diopter; the fourth lens has diopter, the fifth lens has diopter, the object side surface of the fifth lens is in an inflection shape; thecentral part protrudes towards the object plane; edge parts of the fifth lens are bent in the object surface direction and are in 3 shape; the sixth lens has diopter; and the seventh lens has diopter.The stray light problem can be well solved, the tolerance sensitivity of the camera module to surface shape errors, eccentricity, concentricity and inclination errors is greatly reduced, and the yield of the camera module is improved.

Description

technical field [0001] The invention relates to an optical imaging system, and in particular to a miniaturized optical imaging system applied to electronic products. Background technique [0002] At present, the smart phones newly launched on the market have been continuously upgraded on the rear camera. In just a few years, the mobile phone camera is going from 6M → 8M → 13M → 16M → 24M → 48M → 64M → 108M, and the rear pixels are almost showing a trend of upgrading every year. According to the supply chain channels of the camera industry, some famous mobile phone manufacturers have planned to include 216M pixels in the development agenda in the next two years. Various mobile phone manufacturers win the market by continuously upgrading the camera pixels and adding camera functions. [0003] In order to obtain the continuous upgrading of mobile phone camera pixels, a major change in the current mobile phone camera technology is the use of larger-sized CMOS used in digital c...

AI Technical Summary

Problems solved by technology

But these structures also have some problems, the second surface 162 of the sixth lens 160, its central portion is too convex, and the central thickness of the lens exceeds twice of the thickness of the edge of the lens, which will cause this surface 162 to face type errors, eccentricity, and concentricity. Degree, and tilt errors are very sensitive

In addition, the uneven thickness of the lens can easily lead to the Yass phenomenon of uneven surface error in the XY direction during the injection molding process of the lens, resulting in blurring and ghosting when the camera takes pictures, reducing the yield of the camera. A major problem is that the partial reflection of the convex part in the middle of the second surface 162 of the sixth lens 160 will cause stray light and ghost images. When facing strong light, the positions within the 0.707 field of view of the image plane are prone to irreversible The only way to solve the problem of stray light is to coat the surface of the lens with an anti-reflective coating with high transmittance to improve the problem of stray light to a certain extent.

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