Image capturing lens group

Abstract

The invention provides an image capturing lens group, from an object side to an image side, which orderly comprises a first lens, a second lens, a third lens, a fourth lens and an aperture, wherein the first lens has positive refractive power, and an object side surface of the first lens is a convex surface; the second lens has negative refractive power; the third lens has the positive refractive power, and the object side surface of the third lens the concave surface while an image side surface thereof is the convex surface, and the object side surface and the image side surface of the third lens are both aspheric surfaces; the fourth lens has the negative refractive power, the image side surface of the fourth lens is the concave surface provided with at least one inflection point, and the object side surface and the image side surface of the fourth lens are both aspheric surfaces; and the aperture is located between a photographed object and the first lens. Only four of the lenses of the image capturing lens group have the refractive power. With the configuration mode of the lens group, volume of a camera lens can be reduced, sensitivity of an optical system is reduced, and higher resolving power can be obtained.

Description

technical field [0001] The present invention relates to an image capturing lens group; in particular, it relates to a miniaturized image capturing lens group applied to a camera phone. 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 elements of general photographic lenses are nothing more than photocoupled devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor elements (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and due to the improvement of semiconductor process technology, the pixel size of the photosensitive element has been reduced, and the development trend of today's electronic products is to have good functions and a thin, light and small appearance. Therefore, it has a good Miniaturized photographic lenses with image quality have become the mainstream in the market. [0003] Traditional pho...

AI Technical Summary

Problems solved by technology

When the pixel area of ​​the photosensitive element is gradually reduced, and the imaging quality requirements of the system are continuously improved, the common three-piece lens group will not be able to meet the requirements of higher-level photographic lens modules.

[0004] U.S. Patent No. 7,365,920 discloses a four-piece lens group, but wherein the first lens and the second lens are doublets bonded to each other by two glass spherical mirrors to eliminate chromatic aberration, but this method has its disadvantages. First, too many configurations of glass spherical mirrors lead to insufficient freedom of the system, which makes it difficult to shorten the total optical length of the system; second, the bonding process of glass lenses is not easy, resulting in difficulties in manufacturing

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