Prime lens

Abstract

The embodiment of the invention provides a prime lens. The prime lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, all of which are sequentially arranged along the direction from an object plane to an image plane; the first lens, the second lens, the fifth lens and the sixth lens are plastic aspheric lenses; and the third lens and / or the fourthlens are / is glass aspheric lenses. The prime lens in the embodiment is large in aperture, small is size and low in cost.

Description

technical field [0001] Embodiments of the present invention relate to lens technology, and in particular to a fixed-focus lens. Background technique [0002] Because it has a larger amount of light than ordinary lenses, the image brightness of large aperture lenses is higher than that of ordinary lenses in the same environment, and it can also show better results in dim environments, so it is very popular in the security monitoring industry. . Nowadays, the security industry has become fully high-definition and miniaturized, so higher requirements are placed on the resolution and volume of large-aperture lenses. [0003] However, large apertures bring aberrations that are more difficult to correct, making traditional large-aperture lenses designed and manufactured with all-glass spherical structures generally have low resolution or large volumes, resulting in large volumes and high costs. Contents of the invention [0004] An embodiment of the present invention provides ...

AI Technical Summary

Problems solved by technology

[0003] However, large apertures bring aberrations that are more difficult to correct, so that traditional large aperture lenses designed and manufactured using all-glass spherical structures generally have low resolution or large volume, so there are problems of large volume and high cost.

Images