Optical lens for photograph shooting

Abstract

The invention discloses an optical lens for photograph shooting. The optical lens comprises a first lens with positive inflectional force, a second lens with negative inflectional force, a third lens with positive inflectional force and a fourth lens with negative inflectional force which are arranged from the object side to the image side in sequence, wherein the object-side surface of the first lens is convex; the image-side surface of the second lens is concave; and the image-side surface of the fourth lens is concave, and the surfaces on the object-side surface and the image-side surface of the fourth lens are both aspheric. The optical lens for photograph shooting is further provided with an aperture and an electronic photosensitive element, wherein the aperture is arranged between the first lens and the second lens, and the electronic photosensitive element is arranged at the position of an imaging surface and used for enabling an object to be shot to form an image. The optical lens for photograph shooting is provided with four lenses with inflectional force. By means of the configuration mode of a lens group, the size of the lens can be effectively reduced, sensitiveness of an optical system is reduced, and large resolution power can be obtained.

Description

[0001] The present invention is a divisional application with an application date of May 18, 2010, an application number of 201010182932.4, and an invention name of a photographic optical lens. technical field [0002] The invention relates to a photographic optical lens, in particular to a miniaturized photographic optical lens that can reduce the sensitivity of the optical system and has high resolution. Background technique [0003] It is common to see miniaturized photographic optical lenses with high resolution, which mostly use an optical system with a front aperture and four lenses. Among them, the first lens and the second lens are usually bonded with two glass spherical lenses to form a doublet lens ( Doublet Lens) to eliminate chromatic aberration, as shown in U.S. Patent No. 7,365,920, but this method has its disadvantages. First, too many spherical lens configurations make the system lack of freedom, which makes the total optical length of the system difficult to ...

AI Technical Summary

Problems solved by technology

[0003] It is common to see miniaturized photographic optical lenses with high resolution, which mostly use an optical system with a front aperture and four lenses. Among them, the first lens and the second lens are usually bonded with two glass spherical lenses to form a doublet lens ( Doublet Lens) to eliminate chromatic aberration, as shown in U.S. Patent No. 7,365,920, but this method has its disadvantages. First, too many spherical lens configurations make the system lack of freedom, which makes the total optical length of the system difficult to shorten. Second, the glass lens bonding process is not easy, resulting in difficulties in manufacturing

U.S. Patent No. 7,277,238 provides a lens group 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 before the first lens , so that the sensitivity of the system is relatively increased, and it is more difficult to control the yield in manufacturing

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