Day-night dual-purpose zoom lens capable of eliminating heat difference

Abstract

The invention discloses a day-night dual-purpose zoom lens capable of eliminating a heat difference. The day-night dual-purpose zoom lens comprises a first lens group, an automatic aperture, a second lens group, an optical filter and a photographic plate. The first lens group is composed of three glass lenses. The second lens group is composed of five lenses, and at least three lenses of the second lens group are plastic aspherical lenses. According to the invention, the production cost of the lens provided by the invention is lowered, the market competitiveness of the lens is enhanced; each lens is optimally configured, and the heat difference elimination design is adopted, so that the defect that the focus drifting amount of the plastic lenses is large under high-low temperature environments is effectively overcome, and the lens provided by the invention has the advantage of stable analysis under different temperature usage conditions; in addition, the lens provided by the invention can realize triple zooming, the day-night dual-purpose function is achieved, and the resolving power can realize the image quality of three million pixels.

Description

【Technical field】 [0001] The invention relates to an optical lens, in particular to a day and night adiabatic zoom lens. 【Background technique】 [0002] As people pay more attention to the field of surveillance, all walks of life have increased the demand for surveillance lenses. The market share of surveillance lenses directly reflects the competitiveness of the lens manufacturer, and only lenses with good performance and good prices can stand out. Favored by the market. [0003] Because the price of glass lenses is much higher than that of plastic lenses, the overall price of glass lenses is higher, and the overall weight is also larger. Patent document CN204405928U discloses a zoom lens, which adopts 9 glass lenses, so that the The cost of lens products is high. Therefore, a mixture of glass lenses and plastic lenses has appeared in the monitoring lens on the market, or both use plastic lenses. [0004] Such as the patent document CN101943789A discloses another kind of...

AI Technical Summary

Problems solved by technology

[0004] Such as the patent document CN101943789A discloses another kind of lens, which has adopted 9 lenses in total, wherein used two plastic aspheric lenses, but still used 7 glass spherical lenses, the lens quantity in the lens is still more, only adopts The impact of two plastic lenses on the overall weight and cost of the lens is not significant

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