Lens group for shooting

Abstract

The invention discloses a lens group for shooting. From an object side to an image side, the lens group comprises a first lens, a second lens, a third lens, a fourth lens and an aperture in turn, wherein the first lens produces positive refracting power; the front surface of the first lens is a convex surface; the second lens produces negative refracting power; the back surface of the second lensis a concave surface; the front surface of the second lens is glued with the back surface of the first lens; the third lens produces negative refracting power; the fourth lens produces positive refracting power; the back surface of the fourth lens is a concave surface; the fourth lens is provided with an inflection point; the aperture is arranged between a shot object and the third lens; in the lens group for shooting, four lenses with refracting power are arranged; the focal distance of the entire lens group for shooting is f; the focal distance of the first lens is f1; and f / f1 is greater than 0.8 and smaller than 2.1. The imaging quality of an optical system can be enhanced, the total optical length of the lens can be controlled effectively and miniaturization characteristic is realized.

Description

technical field [0001] The invention relates to a photographic lens group, in particular to a miniaturized photographic lens group applied to a camera phone. Background technique [0002] In recent years, with the rise of camera phones, the demand for miniaturized photographic lenses has been increasing, and the photosensitive elements of general photographic lenses are nothing more than photocoupled devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductors (Complementary Metal -Oxide Semiconductor, CMOS), and due to the advancement of semiconductor process technology, the pixel area of ​​the photosensitive element is reduced, and the miniaturized photographic lens is gradually developing into the high-pixel field. [0003] Common mobile phone lenses mostly use a three-piece lens group. The lens group consists of a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with positive refractive power fr...

AI Technical Summary

Problems solved by technology

However, when the pixel area of ​​the photosensitive element is gradually reduced, and the system's requirements for imaging quality increase, the common three-piece lens group will not be able to meet the needs of higher-end photographic lens modules.

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