Fisheye lens with large image plane and high resolution

Abstract

The invention relates to the technical field of lenses, and discloses a fisheye lens with a large image surface and high resolution. The fisheye lens comprises eleven lenses, wherein the first lens, the second lens and the seventh lens are convex-concave lenses with negative refractive indexes, the third lens is a concave flat lens with a negative refractive index, the fourth lens is a concave-convex lens with positive refractive index, the fifth lens and the eighth lens have positive refractive index, the object side surfaces of the fifth lens and the eighth lens are convex surfaces, the sixth lens and the eleventh lens are convex-convex lenses with positive refractive indexes, the ninth lens has a positive refractive index, the image side surface of the ninth lens is a convex lens, the tenth lens has a negative refractive index, the object side surface of the tenth lens is a concave surface, the object side surfaces and the image side surfaces of the fifth lens and the sixth lens areaspheric surfaces, the seventh lens and the eighth lens are glued with each other, and the ninth lens and the tenth lens are glued with each other. The fisheye lens has the advantages of high resolution, good imaging quality, large image surface, high light transmission and small distortion, and the pixel, the edge and the center occupied by the same unit angle are close to each other.

Description

technical field [0001] The invention belongs to the technical field of lenses, in particular to a fisheye lens with a large image plane and high resolution. Background technique [0002] A fisheye lens is an ultra-wide-angle lens with a focal length of 16mm or less. The front lens of this lens has a large diameter and protrudes toward the front of the lens in a parabolic shape, which is quite similar to the eyes of a fish, so it is commonly known as a "fisheye lens". At present, fisheye lenses have been widely used in security monitoring, vehicle and other fields. Therefore, the requirements for fisheye lenses are getting higher and higher. [0003] However, there are still many shortcomings in the existing general fisheye lens, such as the size of the target surface is mostly about 1 / 2.8 inches, and the imaging frame is small; the light transmission is generally not high, and the low-light effect is not good; The pixels occupied by the same unit angle, the edge is less th...

AI Technical Summary

Problems solved by technology

[0003] However, there are still many shortcomings in the existing general fisheye lens, such as the size of the target surface is mostly about 1 / 2.8 inches, and the imaging frame is small; the light transmission is generally not high, and the low-light effect is not good; The pixels occupied by the same unit angle, the edge is less than the center, etc., can no longer meet the increasing requirements, and it is necessary to improve it

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