Optical lens group for capturing image

Abstract

The invention discloses an optical lens group for capturing images, successively comprising a first lens with positive flexion force, a second lens with negative flexion force, a third lens, a four lens and an aperture from an object side to an image side, wherein the object side surface of the first lens is a convex side; the image side surface of the second lens is a convex side; the object side surface of the third lens is a concave side, the image side surface of the third lens is a convex side, at least one of the object side surface and the image side surface of the third lens is an aspheric surface; the image side surface of the fourth lens is a concave side, at least one of the object side surface and the image side surface of the fourth lens is provided with at least one inflection point; the aperture is arranged between a shot object and the second lens; the distance between the first lens and the second lens on an optical axis is T12, the focal length of the integral optical lens group for capturing images is f, the dispersion coefficient of the first lens is V1, the dispersion coefficient of the third lens is V3, and all coefficients satisfy the following relational expressions: (T12/f)*100 is less than 20 and more than 0.5, and V1-V3 is more than 23; and the optical lens group for capturing images only comprises the above four lens with flexion force. The optical lens group for capturing images can effectively improve the imaging quality of the system and is thin.

Description

technical field [0001] The invention relates to an image-taking optical mirror group; in particular, it relates to a miniaturized image-taking optical mirror group applied to a mobile phone camera. Background technique [0002] In recent years, with the rise of mobile phone cameras, the demand for miniaturized photographic lenses has increased day by day, and the photosensitive elements of general photographic lenses are nothing more than photocoupled devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor elements (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and due to the advancement of semiconductor manufacturing technology, the pixel area of ​​the photosensitive element is reduced, and the miniaturized photographic lens is gradually developing into the high-pixel field. Therefore, the requirements for imaging quality are also increasing. [0003] Traditional photographic lenses mounted on mobile phone cameras mostly adopt a three...

AI Technical Summary

Problems solved by technology

However, as the pixel area of ​​the photosensitive element gradually shrinks and the system's requirements for imaging quality continue to increase, the common three-piece lens group can no longer meet the needs of higher-end photographic lens modules.

[0004] U.S. Patent No. 7,365,920 discloses a four-piece lens group, but wherein the first lens and the second lens are bonded with two glass spherical mirrors to form a Doublet to eliminate chromatic aberration, but this method has its disadvantages. First, too many configurations of glass spherical mirrors lead to insufficient freedom of the system, which makes it difficult to shorten the total optical length of the system; second, the manufacturing process of glass lens bonding is not easy, resulting in difficulties in manufacturing

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