High-resolution and low-distortion day-and-night prime lens

Abstract

The invention discloses a high-resolution and low-distortion day-and-night prime lens. The high-resolution and low-distortion day-and-night prime lens comprises lenses, a diaphragm and a lens fixing assembly; five lenses are adopted, and form a pupil entering group and a pupil outgoing group; the pupil entering group is located at the pupil entering side of the diaphragm; a convex lens (J1) and a concave lens (J2) are sequentially arranged in the optical path direction of the pupil entering group; the pupil outgoing group is located at the pupil outgoing side of the diaphragm; a convex lens (J3), a convex lens (J4) and a concave lens (J5) are sequentially arranged in the optical path direction of the pupil outgoing group, wherein the convex lens (J4) and the concave lens (J5) are glued and fixed together via the opposite concave and convex faces of the convex lens (J4) and the concave lens (J5) to form one glued lens group; the lens fixing assembly includes a front pressing ring, a first spacer ring, a second spacer ring and a primary lens cone; the axial cross sections of the first spacer ring and the second spacer ring are ladder-shaped; and the ladder surfaces of the first spacer ring and the second spacer ring both face the convex lens (J3). The high-resolution and low-distortion day-and-night prime lens of the invention has the advantages of high resolution, large relative aperture and day-and-night confocal performance.

Description

technical field [0001] The invention relates to an optical imaging device, especially a high-resolution, low-distortion day-night fixed-focus lens. Background technique [0002] Network cameras are commonly used equipment in security systems, and the lens is the main component of the network camera. The performance of the lens directly affects the imaging quality and imaging field of view. In the design of high-resolution lenses, increasing the relative aperture to increase the amount of incoming light is one of the commonly used methods First, increasing the relative aperture will easily lead to an increase in the high-level aberrations related to the relative aperture. How to eliminate high-level aberrations as much as possible while increasing the relative aperture is a research direction. Contents of the invention [0003] The invention proposes a high-resolution, low-distortion fixed-focus lens for day and night, which can realize the technical characteristics of high...

AI Technical Summary

Problems solved by technology

[0002] Network cameras are commonly used equipment in security systems, and the lens is the main component of the network camera. The performance of the lens directly affects the imaging quality and imaging field of view. In the design of high-resolution lenses, increasing the relative aperture to increase the amount of incoming light is one of the commonly used methods First, increasing the relative aperture will easily lead to an increase in the high-level aberrations related to the relative aperture. How to eliminate the high-level aberration as much as possible while increasing the relative aperture is a research direction

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