Imaging optical system

Abstract

The present invention discloses an imaging optical system, which comprises a first lens, a second lens, a third lens and a fourth lens, wherein the four lenses are arranged sequentially from the object side to the image side along the optical axis. The first lens has a positive refractive power and the object-side surface of the first lens is a convex surface in the area of the optical axis. The second lens has a negative refractive power and the object-side surface of the second lens is a concave surface in the area of the optical axis. The image-side surface of the second lens is a convex surface in the area of the optical axis. The third lens has a positive refractive power and the object-side surface of the third lens is a concave surface in the area of the optical axis. The image-side surface of the third lens is a convex surface in the area of the optical axis. The fourth lens has a negative refractive power and the object-side surface of the fourth lens is a convex surface in the area of the optical axis. The image-side surface of the fourth lens is a concave surface in the area of the optical axis. The object-side surface or / and the image-side surface of the fourth lens is at least provided with one point of inflexion. According to the technical scheme of the imaging optical system, the focal length is shortened. Therefore, the field angle of the imaging system is increased and the shooting visual field of the imaging system is enlarged in the high-pixel and large-aperture condition.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to an imaging optical system. Background technique [0002] In recent years, with the rise of portable electronic products with camera functions, the demand for optical systems used in such products is increasing. The photosensitive element of the general optical system is a photosensitive coupling element CCD or a complementary metal oxide semiconductor element. With the advancement of semiconductor technology, the pixel size of the photosensitive element is reduced, and the optical system is gradually developing into the field of high pixels. Therefore, the requirements for imaging quality also increasing. At the same time, for better shooting effects and more shooting details, people also put forward higher requirements for aperture and field of view. [0003] The traditional optical system mounted on a high-resolution electronic device mostly adopts a four-piece lens st...

AI Technical Summary

Problems solved by technology

[0003] The traditional optical system mounted on a high-resolution electronic device mostly adopts a four-piece lens structure. The shape of the lens reduces the amount of light transmitted and the field of view is limited; and the lens is too curved to cause poor molding; The chip structure can meet the needs of large aperture and high resolution, but too strong refractive power makes the sensitivity too high, and the light angle changes too much, causing surface reflection and other problems, and increasing the manufacturing cost

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