Optical Lenses for Photography

Abstract

The invention discloses an optical lens for photographing, which sequentially comprises a first lens, a second lens and a third lens from an objective side to an image side, wherein the first lens has a positive flexion force, and the surface of the objective side of the first lens is a convex surface; the second lens has a positive flexion force, and the surface of the image side of the second lens is a convex surface, the third lens has a positive flexion force, the surface of the objective side of the third lens is a convex surface and the surface of the image side of the third lens is a concave surface, and both the surface of the objective side and the surface of the image side of the third lens are non-spherical surfaces; and at least surface of the surface of the objective side andthe surface of the image side of the third lens is provided with at least one inflexion point; the optical lens for photographing is additionally provided with a diaphragm which is arranged between aphotographed object and the second lens; and in the optical lens for photographing, the three lenses with the flexion force are comprised. By adoption of the lens group allocation mode, the lens volume can be effectively reduced, the sensitivity of the optical system is reduced, and higher image resolution can be obtained.

Description

technical field [0001] The invention relates to an optical lens for photography, in particular to a miniaturized optical lens for photography used in electronic products. Background technique [0002] In recent years, with the rise of imaging modules, the demand for miniaturized photographic lenses has been increasing, and the photosensitive elements of general photographic lenses are nothing more than charge coupled devices (CCD) or complementary metal oxide semiconductor elements. (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor) two types, and with the advancement of process technology, the pixel size of the photosensitive element is reduced. In addition, today's electronic products are developing with good functions and thin, light and small appearance. Therefore, Miniaturized photographic lenses with good imaging quality have become the mainstream in the current market. [0003] Existing miniaturized photographic lenses, in order to reduce manufacturing cos...

AI Technical Summary

Problems solved by technology

[0003] Existing miniaturized photographic lenses, in order to reduce manufacturing costs, mostly adopt two-piece lens structure. For example, U.S. Patent No. 7,525,741 discloses a photographic lens with a two-piece lens structure. The poor correction ability is limited and cannot meet the needs of higher-end camera modules, but the configuration of too many lenses will make the total length of the lens difficult to achieve miniaturization

[0004] In order to obtain good imaging quality and have the characteristics of miniaturization, it is a feasible solution to configure an imaging optical system with three lenses. For example, US Patent No. 7,443,613 discloses a photographic lens with a three-lens structure. The first design of this design The three lenses are in the shape of biconcave. This configuration will easily increase the sensitivity of the system, and such a configuration will shorten the distance between the position of the exit pupil of the system and the imaging surface, which will increase the angle of the chief ray incident on the imaging surface, which will easily cause The peripheral brightness of the system is reduced, which in turn affects the image quality

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