Thin photographic optical lens group

Abstract

The invention provides a thin photographic optical lens groups which sequentially comprises a first lens with positive flexion force, a second lens with negative flexion force and an aperture from the object side to the image side, wherein the front surface of the first lens is a convex surface, the rear surface is a concave surface, and the front surface and the rear surface of the first lens are both aspheric surfaces; the front surface of the second lens is a concave surface, the rear surface is a convex surface, and the front surface and the rear surface of the second lens are both aspheric surfaces; the aperture is positioned in the front of the first lens; in the thin photographic optical lens group, the Abbe number of the first lends is V1, the Abbe number of the second lens is V2,and the relation satisfies: absolute (V1-V2) is less than 15; in the thin photographic optical lens group, the number of lenses with the flexion force is limited to be two; and by adopting the lens structure and the arrangement mode, the size of the lens group is effectively shortened, the sensitivity of an optical system is reduced, and the higher resolving power can be obtained.

Description

technical field [0001] The invention relates to a photographic optical mirror group; in particular, it refers to a thin photographic optical mirror group applied to a camera mobile 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 (Complementary Metal-Oxide Semiconductor, CMOS) two types, and due to the advancement of semiconductor process technology, the pixel area of ​​the photosensitive element is reduced, and electronic products continue to develop in the direction of good functions and thinner and smaller. The demand for high-quality thin photographic lenses is increasing day by day. [0003] Common mobile phone lenses, in consideration of aberration correction, mostly use a thre...

AI Technical Summary

Problems solved by technology

[0003] Common mobile phone lenses, in consideration of aberration correction, mostly use a three-piece lens structure, the most common of which is the positive and negative positive Triplet type. However, as the lens size continues to become thinner and smaller, the system imaging space will also follow. Therefore, it is difficult to insert the three lenses, and in the limited space, the thickness of the lens also needs to be reduced, which will make the material uniformity of the lens made by plastic injection molding poor.

[0004] U.S. Patent No. 7,463,433 provides a thinned photographic lens composed of two lenses, which are a first lens with positive refractive power and a second lens with negative refractive power in sequence from the object side to the image side, although Such a structure can provide good resolution and maintain the characteristics of lightness and thinness. However, because the first lens adopts double-convex form, the refractive power of each lens in the system is relatively enhanced, which easily increases the sensitivity of the optical system, which is harmful to manufacturing. Yield control is more difficult

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