Ultra-wide-angle fisheye lens

Abstract

The invention discloses an ultra-wide-angle fisheye lens, which comprises a lens barrel, an optical system arranged in the lens barrel, a first pressing ring, a second pressing ring and a sealing ring, and the optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged from an object side to an image side; the focal length of each lens is reasonably configured; the first pressing ring is connected with the lens barrel and abuts against the object side face of the first lens, the second pressing ring is connected with the lens barrel and abuts against the image side face of the tenth lens, the image side face of the first lens is further provided with a first annular platform, and the sealing ring is clamped between the first annular platform and the lens barrel. According to the lens, the consistency of optical axes can be ensured, the yield and the assembly efficiency in batch production can be improved, large light flux, large target surface and large field angle can be realized, stray light ghosting is reduced, chromatic aberration is corrected, the imaging quality is improved, the lens miniaturization is facilitated, the IP67 protection grade requirement is met, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and in particular relates to a super wide-angle fisheye lens. Background technique [0002] As the imaging system becomes increasingly integrated and convenient, the matching imaging lens also requires the overall size to be as small as possible under the premise of ensuring the imaging quality, so as to reduce the space ratio of the entire imaging module. At the same time, for cameras mounted on digital products, imaging technology with large field of view, large target area, and high pixels has increasingly become one of the core battlefields for competition among various manufacturers. [0003] In order to ensure the imaging quality and match the requirements of a larger image area and a smaller imaging lens, it is often necessary to focus on the relationship between the total optical length TTL of the imaging lens and the diagonal size H of the chip during design, and the existing ultr...

AI Technical Summary

Problems solved by technology

[0003] In order to ensure the imaging quality and match the requirements of a larger image area and a smaller imaging lens, it is often necessary to focus on the relationship between the total optical length TTL of the imaging lens and the diagonal size H of the chip during design, and the existing ultra-wide-angle fish The larger the field of view of the spectacle lens, the more difficult it is to control the size of the lens, and the more difficult it is to design and manufacture. It is often necessary to design an imaging lens with a large difference in the diameter of some adjacent lenses to meet the requirements of high resolution. The caliber difference between two adjacent lenses is significantly greater than that of traditional imaging lenses, and the assembly performance and application in special environments often perform poorly (such as the protection level is difficult to meet the required standards)

Images