Image taking optical lens system

Abstract

The invention discloses an image taking optical lens system. The image taking optical lens system sequentially comprises a first lens, a second lens and a third lens from an object side to an image side, wherein the surface of the object side of the first lens is a convex surface and the surface of the image side of the first lens is a concave surface; the surfaces of the object side and the image side of the second lens are non-spherical surfaces; the surfaces of the object side and the image side of the third lens are non-spherical surfaces; at least one inflection point is arranged on at least one of the surfaces of the object side and the image side of the third lens; and an aperture is arranged between the first lens and the second lens. In the image taking optical lens system, the three lenses with inflectional forces are provided; the focus of the image taking optical lens system is f; the focus of the first lens is f1; the curvature radius of the surface of the object side of the first lens is R1; the curvature radius of the surface of the image side of the first lens is R2; the thickness of the second lens on an optical axis is CT2; and the parameters meet the following relation formulas: the absolute value of f / f1 is less than 0.58, R1 / f is more than 0.20 and less than 0.65, R2 / f is more than 0.00 and less than 2.40, and CT2 is more than 0.10mm and less than 1.00mm.

Description

technical field [0001] The invention relates to an image-taking optical lens system; in particular, it relates to an optical system applied to a miniaturized image-taking module. Background technique [0002] In recent years, with the vigorous development of imaging modules, the demand for miniaturized photographic lenses has been increasing, and the photosensitive elements of general photographic lenses are nothing more than charge coupled devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor elements. (Complementary Metal-Oxide Semiconductor, CMOS) two types, and with the advancement of semiconductor manufacturing technology, the pixel size of the photosensitive element is reduced, and today's electronic products are developing with good functions and thin, light and small appearance. Therefore, it has Miniature imaging lenses with good imaging quality have become the mainstream in the market. [0003] In order to correct aberrations, the traditi...

AI Technical Summary

Problems solved by technology

However, the first lens is in the form of a biconvex lens. Although this form can effectively shorten the total optical length of the system, it is easy to cause the refractive power of the first lens to be too large, which will cause more aberrations in the system and affect the system. In order to balance the refractive power of the first lens, the system must also increase the refractive power of the second lens and the third lens, which will cause a relatively high sensitivity of the system and make it difficult to control the manufacturing yield.

Images