Photographing optical lens

Abstract

The invention discloses a photographing optical lens. The optical lens comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with the positive refractive power and a fourth lens with the negative refractive power from an object side to an image side in turn and is provided with a diaphragm, wherein an object side surface of the first lens is a convex surface; an image side surface of the second lens is a concave surface; an image side surface of the fourth lens is a concave surface, and an object side surface and the image side surface of the fourth lens are aspheric surfaces; and the diaphragm is arranged between the first lens and the second lens. In the invention, four lenses with refractive power are arranged in the photographing optical lens.

Description

technical field [0001] 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 [0002] 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, which causes difficulties in manufacturing. U.S. Patent No. 7,277,238 provides a lens group of four independent lenses, including mul...

AI Technical Summary

Problems solved by technology

[0002] 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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