A wide-angle anti-distortion dual-band confocal optical lens

Abstract

The invention provides a wide-angle distortion-removing dual-band confocal optical lens which comprises a front group, a diaphragm, a back group and an optical filter. The wide-angle distortion-removing dual-band confocal optical lens is characterized in that the front group is a Galileo optical system and comprises a first negative lens, a second negative lens, a third negative lens, a first positive lens and a second positive lens in sequence from a near object side, the back group has positive focal power and comprises a third positive lens, a fourth negative lens, a fourth positive lens, a fifth positive lens and a sixth positive lens in sequence from the near object side, the third positive lens, the fourth negative lens and the fourth positive lens are tightly connected into a tight-connecting group, and the lenses are all glass lenses. According to the wide-angle lens, ten lenses are used, elements are arranged reasonably, the structure is simple, production difficulty and cost are lowered, the requirement that a view field angle reaches 126 degrees, and distortion is smaller than 5% is met, imaging quality is high, wave bands are visible bands and near-infrared bands, and the optical lens can be used for a monitoring camera for day and night.

Description

technical field [0001] The invention relates to a lens, in particular to a wide-angle anti-distortion dual-band confocal optical lens for security monitoring. Background technique [0002] Wide-angle lenses can obtain a larger field of view with its huge field of view, and are widely used in art photography, vehicle radar and security monitoring and other fields. However, due to the image distortion caused by the huge field of view - distortion,. Distortion is allowed in photographic lenses due to the need for specific artistic effects, but in the fields of vehicle radar, security monitoring, etc., huge distortion is fatal and may lead to tragedies. Therefore, distortion is one of the huge factors restricting the manufacture and application of wide-angle lenses. [0003] In the prior art, the commonly used methods for eliminating distortion of wide-angle lenses: one is to realize the elimination of distortion for wide-angle lenses through complex digital image processing. ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the commonly used methods for eliminating distortion of wide-angle lenses: one is to realize the elimination of distortion for wide-angle lenses through complex digital image processing. The image processing process of this method is complicated, involving more digital hardware, which greatly increases the cost; the other is Changing the lens group structure of the wide-angle lens, for example, in order to expand the field of view without introducing distortion, generally use aspherical lenses, and correct the distortion at key positions of the lens. However, in this way, although the existing aspheric wide-angle lenses can Effectively correct distortion, but there are defects such as complex structure and large number of lenses

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