Capturing optical lens

Abstract

The invention discloses a capturing optical lens sequentially comprising a first lens, a second lens, a third lens and a fourth lens from an object side to an image side, wherein the first lens has a positive refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface; the second lens has a negative refractive power, and the object side surface of the third lens is a concave surface; the third lens has a positive refractive power, the image side surface of the first lens is a convex surface, and at least oneof the object side surface and the image side surface of the third lens is an aspheric surface; and the fourth lens has a negative refractive power, the object side surface of the fourth lens is a convex surface, the image side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is provided with at least one inflexion point. Only four lenses with the refractive powers are arranged in the capturing optical lens; the capturing optical lens is provided with an aperture and an electronic photosensitive device, a distance from the aperture to the electronic photosensitive device on an optical axis is SL, a distance from the object side surface of the first lens to the electronic photosensitive device on the optical axis is TTL, and the distances satisfy a relation of 0.75<SL / TTL<0.90. Through the arrangement mode of the lens group, the lens size can be effectively reduced, the sensitiveness of an optical system is reduced, and a higher resolution power can be obtained.

Description

technical field [0001] The invention relates to an image-taking optical lens, in particular to a miniaturized image-taking optical lens 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 device of general photographic lenses is nothing more than a photosensitive coupling device (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor device ( Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and due to the advancement of semiconductor process technology, the pixel area of ​​the photosensitive device 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 use a front aperture and a four-piece ...

AI Technical Summary

Problems solved by technology

However, this method has its disadvantages. First, too many glass spherical mirror configurations make the system less free, 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.

[0004] U.S. Patent No. 7,277,238 discloses a lens group composed of four independent lenses, including multiple aspherical lenses, which can effectively shorten the total optical length of the system and obtain good imaging quality, but because its aperture is set at the first Before the lens, the sensitivity of the system will be relatively improved, and it is difficult to control the yield in manufacturing

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