A plastic aspheric zoom lens

Abstract

The invention relates to a plastic aspheric zoom lens, and the zoom lens comprises a front compensation group with the negative focal power and a rear zoom group with the positive focal power, whereinthe front compensation group and the rear zoom group are sequentially arranged along an incident light path from the front to the rear. The front compensation group sequentially comprises a meniscuslens A, a biconcave lens B and a meniscus lens C, wherein the meniscus lens A, the biconcave lens B and the meniscus lens C are sequentially arranged along an incident light path from the front to therear. The rear zoom group comprises a biconvex lens D, an aspheric surface E, an aspheric surface F, a gluing piece G, a gluing piece H and an aspheric surface I, wherein the biconvex lens D, the aspheric surface E, the aspheric surface F, the gluing piece G, the gluing piece H and the aspheric surface I are sequentially arranged along an incident light path from the front to the rear. The aspheric surface E, the aspheric surface F and the aspheric surface I form a separation aspheric surface group for rectifying spherical aberration and chromatic aberration. An aspheric surface air gap for compensating for the high-order aberrations is disposed between the aspheric surface E and the aspheric surface F. Through the point-point corresponding relation between the front compensation group and the rear zoom group, the zoom lens achieves the change of the focal length between 2.7mm and 13.5mm. The cooperation of the front compensation group and the rear zoom group achieves the day-night confocal function, and the zoom lens can achieve the high-resolution and low-temperature-drift functions.

Description

technical field [0001] The invention relates to a plastic aspheric zoom lens. [0002] technical background [0003] There are a variety of zoom lenses with focal lengths ranging from 2.8mm to 12mm used in security systems on the market. However, it is difficult for zoom lenses designed with glass to meet market demand in terms of pixels and performance. In order to improve performance, increase pixels, and increase zoom ratio, more glass lenses are used to achieve higher-definition image quality, which greatly increases product costs and makes product promotion more difficult. At present, in the security industry, there are few zoom lenses with low cost, high image quality, low temperature drift, and high zoom ratio in the true sense. Contents of the invention [0004] In view of this, the purpose of the present invention is to provide a plastic aspheric zoom lens, which adopts the point-to-point correspondence between the front compensation group and the rear zoom group ...

AI Technical Summary

Problems solved by technology

[0003] There are a variety of zoom lenses with a focal length of 2.8mm-12mm on the market, which are used in security systems. However, due to the use of glass-designed zoom lenses, it is difficult to meet market demand in terms of pixels and performance.

In order to improve performance, increase pixels, and increase zoom ratio, more glass lenses are used today to achieve higher-definition image quality, which greatly increases product costs and makes product promotion more difficult.

At present, in the security industry, there are few zoom lenses with low cost, high image quality, low temperature drift, and high zoom ratio in the true sense.

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