Ultrathin three-lens imaging lens set

Abstract

The invention relates to an ultrathin three-lens imaging lens set, in particular to an ultrathin imaging lens set applied to a photographing mobile phone lens and a notebook computer photographing lens. The imaging lens set consists of three lenses with refractive indexes and an open diaphragm; the first lens, the open diaphragm, the second lens and the third lens are arranged in turn from an object side to an image side, wherein the first lens is a positive lens, the front surface of the first lens is a convex surface, and the rear surface of the first lens is a concave surface; the second lens is a negative lens, the front surface of the second lens is a concave surface, and the rear surface of the second lens is a convex surface; and the third lens is a positive lens, the front surface of the third lens is a convex surface, and the rear surface of the third lens is a concave surface. Moreover, each surface of the first lens, the second lens and the third lens consists of a high-order non-spherical plastic lens so as to reduce the cost and meet the resolution requirement of a high-pixel photosensitive element.

Description

【Technical field】 [0001] The invention relates to an ultra-thin three-piece imaging lens group, in particular to an ultra-thin imaging lens group applied to camera lenses and notebook computer camera lenses. 【Background technique】 [0002] It is generally suitable for lenses with megapixels above 1.3 MEGA and below 3.0 MEGA, and most of them adopt a three-piece lens structure. Among the common three-piece lenses, the front aperture is the majority, and its advantage is that the telephoto ratio is small (the telephoto ratio (TL / f) is the ratio of the total length (TL) of the entire optical system to the focal length (f)), light incident The angle to the photosensitive element is small; the disadvantage is that the requirements for lens eccentricity error are high, and the processing is difficult. The yield rate of this type of lens is low in the process of mass assembly and production, and the production cost is relatively high. 【Content of invention】 [0003] The inventi...

AI Technical Summary

Problems solved by technology

Among the common three-piece lenses, the front aperture is the majority, and its advantage is that the telephoto ratio is small (the telephoto ratio (TL / f) is the ratio of the total length (TL) of the entire optical system to the focal length (f)), light incident The angle to the photosensitive element is small; the disadvantage is that the requirements for lens eccentricity error are high, and the processing is difficult

This type of lens has a low product yield rate and a relatively high production cost in the mass assembly process

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