Positive distortion fisheye lens

Abstract

The invention discloses a positive distortion fisheye lens, which sequentially comprises a first lens to a tenth lens from an object side to an image side along an optical axis, and each of the first lens to the tenth lens comprises an object side surface and an image side surface; the first lens has a negative refractive index; the second lens has a negative refractive index; the third lens has a negative refractive index; the fourth lens has a negative refractive index; the fifth lens has a positive refractive index; the sixth lens has a positive refractive index; the seventh lens has a positive refractive index; the eighth lens has a negative refractive index; the ninth lens has a positive refractive index; the tenth lens has a negative refractive index; the optical imaging lens has only ten lenses with refractive indexes. According to the invention, 12MP pixels can be supported, a high-definition imaging effect is achieved, and an imaging picture is clear and uniform; the lens can be ensured to have good picture brightness when being used in a night environment; day and night confocal can be realized, day and night dual-purpose is realized, and clear imaging can be ensured in a night mode; the pixel proportion of the lens edge is large, and the compressive sense is small.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to an orthodistortion fisheye lens. Background technique [0002] The front lens of the fisheye 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 called "fisheye lens". At present, fisheye lenses have been widely used in VR cameras, security monitoring, Video conferencing, drones, vehicles and other fields, therefore, the requirements for fisheye lenses are getting higher and higher. But the existing fisheye lens has at least the following deficiencies: [0003] 1. The general fisheye lens has low pixels and insufficient resolution, and the imaging picture is blurred and noisy. [0004] 2. For general fisheye lenses, due to wide-angle design requirements, the light transmission is generally not large, and the relative illuminance at the edge of the screen is low. [0005] 3. The...

AI Technical Summary

Problems solved by technology

[0003] 1. The general fisheye lens has low pixels and insufficient resolution, and the imaging picture is blurred and noisy.

[0004] 2. For general fisheye lenses, due to the wide-angle design requirements, the light transmission is generally not large, and the relative illuminance at the edge of the picture is low

[0005] 3. The general fisheye lens can only support single-visible use or single-infrared use, and cannot achieve a clear state at the same time day and night

[0006] 4. The general fisheye lens has negative f-theta distortion, the distortion is large, the proportion of pixels on the edge is small, and the sense of compression is strong

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