Optical lens group for photographing

Abstract

The invention discloses an optical lens group for photographing. From an object side to an image side, the optical lens group sequentially comprises a first lens with negative refractive power, a second lens with positive refractive power and a third lens with negative refractive power, wherein the image side surface of the first lens is a concave surface; the object side surface and the image side surface of the second lens are convex surfaces; and the image side surface of the third lens is a concave face, and the object side surface and the image side surface of the third lens are asphericsurfaces. The optical lens group for photographing is also provided with an aperture and an electric photosensitive element for imaging a photographed object; the aperture is arranged between the first lens and the second lens; the electric photosensitive element is arranged on the imaging surface; and three lenses with refractive power are arranged in the optical lens group for photographing. The embodiment of the invention can effectively shorten the total length of the lens, reduce the sensitivity of an optical system, and can acquire excellent imaging quality through the assembly mode of the lens group.

Description

Technical field [0001] The invention relates to an optical lens assembly for photography, in particular to an optical lens assembly for photography applied to a wide-angle photographic lens. Background technique [0002] Existing large viewing angle photographic lenses mostly adopt the configuration of negative refractive power in the front group and positive refractive power in the back group, which is the so-called Inverse Telephoto structure to obtain the characteristics of wide field of view and to consider the image To correct the difference, it is often necessary to configure more than 4 to 5 lenses, as shown in US Patent No. 7,515,351. However, too many lens configurations make it difficult to miniaturize the lens, and the production becomes relatively complicated, which leads to an increase in cost, which is not economical. [0003] In order to have both good image quality and miniaturization, a photographic optical lens group with three lenses is a feasible solution. US ...

AI Technical Summary

Problems solved by technology

U.S. Patent No. 7,397,612 discloses a photographic lens with a three-element lens structure, which is sequentially arranged with a first lens with negative refractive power, a second lens with positive refractive power, and a third lens from the object side to the image side, but Such a configuration causes the thickness and curvature of the first lens to be large, making it difficult to meet the miniaturization requirements of the system size

Images