2.8‑12mm Zoom Aspheric Lens

Abstract

The invention relates to a zoom aspheric lens unit of 2.8 to 12mm. The lens unit comprises an optical system arranged in a lens cone. A front group A and a rear group B are successively arranged at the optical system along a light incident direction; and a diaphragm C is arranged between the front group A and the rear group B. The front group A consists of a negative crescent lens A-1, a biconcave plastic aspheric lens A-2, and a biconvex lens A-3, wherein the lenses are successively arranged along a light incident direction; and the rear group B contains a negative crescent plastic aspheric lens B-1, a biconvex lens B-2, and a gummed group formed by sealed connected of a negative crescent lens B-3 and a biconvex lens B-4. According to the invention, the structure is simple and the number of sheets is reduced. With the aspheric lenses, the aberration of an off-axis view field is corrected well; the high-quality pixel can be realized at daytime and the same image quality can be realized under the circumstances with insufficient light or at night; the day-light confocal function of the lens unit can be guaranteed; a few pieces of glass are used by the optical system; and the production cost is lowered.

Description

technical field [0001] The invention relates to a 2.8-12mm zoom aspherical lens. Background technique [0002] The network camera was born in the middle of 1990s. The lens is the main component of the camera, and its performance directly affects the image quality. In the early days, there were various zoom lenses used in security systems in the market. However, due to the large number of optical lenses in many products, the difficulty of assembly and adjustment was increased, and the optical performance index was low. Most of them belonged to low-end products and could only be used for Ordinary cameras with lower pixels, and it is difficult to achieve the advantages of large wide-angle, high resolution, day and night confocal, and fewer lenses. On the other hand, with the continuous development of aspheric technology, plastic aspheric surfaces can also be used in optical lenses and play an important role. Contents of the invention [0003] In order to overcome the defect...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of low technical index and high assembly difficulty of the existing camera lens, and promote the development of high-definition camera lens, it is necessary to improve the image quality of the camera system and expand the application range of the camera system. The present invention provides a 2.8 -12mm zoom aspherical lens

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