6 mm large-aperture day-and-night dual-purpose glass-plastic fixed-focus optical system

Abstract

The invention relates to a 6 mm large-aperture day-and-night dual-purpose glass-plastic fixed-focus optical system. The optical system comprises a meniscus plastic aspheric lens A-1, a meniscus plastic aspheric lens A-2, a plano-convex plastic aspheric lens A-3, a diaphragm C, a biconvex lens B-1, a biconvex plastic aspheric lens B-2, a meniscus plastic aspheric lens B-3 and a biconvex plastic aspheric lens B-4 which are sequentially arranged at intervals from front to back along an incident light path, wherein the meniscus plastic aspheric lens A-1, the meniscus plastic aspheric lens A-2 andthe plano-convex plastic aspheric lens A-3 form a front group A with negative focal power, and the biconvex lens B-1, the biconvex plastic aspheric lens B-2, the meniscus plastic aspheric lens B-3 andthe biconvex plastic aspheric lens B-4 form a rear group B with positive focal power. The spherical aberration, the chromatic aberration and the advanced aberration are corrected by using six plastichigh-order aspheric surfaces, and the focal power of each aspheric surface is reasonably calculated, so that the focal points are not deviated in high-temperature and low-temperature environments, and the day-night parfocal effect is achieved.

Description

technical field [0001] The invention relates to a 6mm large aperture, day and night dual-purpose glass-plastic fixed-focus optical system, and relates to the security field. Background technique [0002] There are various fixed-focus lenses on the market that are used in security systems, but the F number of most lenses is greater than 2.0 and the aperture is small. In order to improve performance and increase pixels, more glass lenses are generally used to achieve higher resolution. The image quality has greatly increased the cost of the product, making it more difficult to promote the product. Moreover, because most of them use glass spherical surface design, limited by the poor processing accuracy and high cost of the glass spherical surface, it is difficult for the lens to meet the market demand in terms of pixels, performance and cost. At present, in the security industry, there are few real low-cost lenses. , high image quality, large aperture, fixed-focus lens for da...

AI Technical Summary

Problems solved by technology

[0002] There are various fixed-focus lenses on the market that are used in security systems, but the F number of most lenses is greater than 2.0 and the aperture is small. In order to improve performance and increase pixels, more glass lenses are generally used to achieve higher resolution. image quality, which greatly increases the cost of the product, making it more difficult to promote the product

Moreover, because most of them use glass spherical surface design, limited by the poor processing accuracy and high cost of the glass spherical surface, it is difficult for the lens to meet the market demand in terms of pixels, performance and cost. At present, in the security industry, there are few real low-cost lenses. , high image quality, large aperture, fixed-focus lens for day and night

Images