camera optical system

Abstract

The invention provides an image pickup optical system. The image pickup optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are coaxially arranged from an object side to an image side; the first lens is a biconvex lens with positive focal power; the object side surface of the second lens is a convex surface, and the image side of the second lens is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens is a biconvex lens; the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens is a lens with negative focal power; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; the seventh lens is a lens with negative focal power; and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is converted into a convex surface from a concave surface from a position near an optical axis to the periphery of the image side surface. According to the image pickup optical system provided by the invention, surface shapes are reasonably optimized, focal power is reasonably distributed, and optical materials are reasonably selected, and therefore, imaging performance under a low-illumination environment can be provided, and imaging is clear.

Description

【Technical field】 [0001] The invention relates to an imaging optical system, in particular to an imaging optical system applied to portable electronic equipment. 【Background technique】 [0002] In recent years, with the vigorous development of miniaturized camera lenses, the demand for miniature imaging modules is increasing day by day, and the photosensitive elements of general camera lenses are nothing more than two types of photosensitive coupling elements or complementary metal oxide conductor elements, and with the development of semiconductor The improvement of manufacturing technology has reduced the pixel size of the photosensitive element. In addition to the development trend of electronic products with good functions and thin, light and small size, miniaturized photographic lenses with good imaging quality have become the mainstream in the market. [0003] In imaging lenses using photosensitive elements, the resolution of images is gradually increasing and the size...

AI Technical Summary

Problems solved by technology

[0004] The current camera lens used in portable electronic devices has a relatively small structure of seven lens groups, but due to structural limitations, the total optical length cannot be further shortened, resulting in limited imaging performance

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