Photographic lens system

Abstract

The invention provides a photographic lens system, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a diaphragm from an object side to an image side, wherein the first lens has positive refractive power, and the surface of the object side of the first lens is a convex surface; the second lens has negative refractive power; the surface of the image side of the third lens is a concave surface; the fourth lens has the positive refractive power; the fifth lens has the negative refractive power, the surface of the image side of the fifth lens is a concave surface, and at least one surface of the fifth lens has at least one inflexion point; and the diaphragm is arranged between the photographed object and the third lens. In the photographic lens system, the optical axis distance between the first lens and the second lens is T12, the focal distance of the whole photographic lens system is f, and the following formula is met: the product of (T12 / f) and 100 is more than 0.5 and less than 15. In the invention, through the configuration, system aberration can be effectively corrected to improve imaging quality, the total optical length of the photographic lens system can be effectively shortened, and the system has the characteristic of broad vision angle.

Description

technical field [0001] The present invention relates to a camera lens system, in particular to a camera lens system 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 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. Therefore, the requirements for imaging quality are also increasing. [0003] Traditional miniaturized photographic lenses mounted on mobile phone cameras, as shown in U.S. Patent No. 7,365,920, mostly adopt a four-piece lens structure; In th...

AI Technical Summary

Problems solved by technology

[0003] Traditional miniaturized photographic lenses mounted on mobile phone cameras, as shown in U.S. Patent No. 7,365,920, mostly adopt a four-piece lens structure; In the case of continuous improvement of system imaging quality requirements, the known four-piece lens group will not be able to meet higher-level photographic lens modules, and due to the continuous development of electronic products towards thinner, lighter and higher performance, there is an urgent need for a A camera lens system that can be used in high-pixel mobile phone cameras without making the total length of the lens too long

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