Datong Light Low Distortion Zoom Aspheric Lens

Abstract

The invention relates to a high-transmittance and low-distortion aspheric zoom lens. A front lens set A, a zooming lens set B and a diaphragm C between the front lens set A and the zooming lens set B are sequentially arranged in an optical system of the lens in the incident light direction; the front lens set A is sequentially provided with a negative crescent lens A-1, a double-concave plastic aspheric lens A-2 and a double-convex lens A-3 in the incident light direction; and the zooming lens set B is sequentially provided with a double-convex plastic aspheric lens B-1, a double-convex lens B-2, a negative crescent lens B-3 and a double-convex plastic aspheric lens B-4 in the incident light direction. According to the lens, chromatic aberration is eliminated by using flint glass with high refraction and low chromatic dispersion and crown glass with low refractive index; by using the plastic aspheric lens, the distortion of the lens is well corrected, and marginal images are reduced truly; and because the lens is made of a little glass, the assembly difficulty of the lens is reduced, and the production cost is improved.

Description

technical field [0001] The invention relates to the field of video camera technology, in particular to a Datong light low-distortion zoom aspheric 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 a variety of zoom lenses used in security systems in the market, but with the rapid rise of the security monitoring market, the optimization and improvement of digital processing and network transmission speeds, the quality requirements for security monitoring lenses have been greatly improved. From surveillance needs to high-definition identification, but because many products have more optical lenses, it is more difficult to assemble and adjust, and the optical performance indicators are low. Most of them are low-end products, which can only be adapted to ordinary cameras with lower pixels It is difficult to rea...

AI Technical Summary

Problems solved by technology

In the early days, there were a variety of zoom lenses used in security systems in the market, but with the rapid rise of the security monitoring market, the optimization and improvement of digital processing and network transmission speeds, the quality requirements for security monitoring lenses have been greatly improved. From surveillance needs to high-definition identification, but because many products have more optical lenses, it is more difficult to assemble and adjust, and the optical performance indicators are low. Most of them are low-end products, which can only be adapted to ordinary cameras with lower pixels It is difficult to achieve the advantages of large wide-angle, large light, low distortion, high resolution, day and night confocal, weather resistance, and fewer lenses; on the other hand, plastic aspheric surfaces are rarely used in optical lenses

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