Super wide angle large clear aperture large image plane zoom lens

Abstract

The invention discloses a super wide angle large clear aperture large image plane zoom lens. The super wide angle large clear aperture large image plane zoom lens comprises, from object space along a direction of an optical axis, a front lens group having a negative focal length, a diaphragm, an intermediate lens group having a positive focal length, and a rear lens group having a positive focal length sequentially. The intermediate lens group is disposed between the diaphragm and the rear lens group, and the front lens group and the intermediate lens group can move back and forth along the optical axis with respect to the diaphragm, and the rear lens group is fixedly arranged. The front lens group comprises, from the object space along the direction of the optical axis, a first lens, a second lens, a third lens, and a fourth lens sequentially. The intermediate lens group comprises, from the space along the direction of the optical axis, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens sequentially. The fifth lens is an aspherical surface lens. The sixth lens and the seventh lens are glued together, and the eighth lens and the ninth lens are glued together. The rear lens group comprises, from the object space along the direction of the optical axis, a twelfth lens and a thirteenth lens sequentially. The twelfth lens and the thirteenth lens are glued together. The super wide angle large clear aperture large image plane zoom lens is advantageous in that the high resolution of the image quality of various focal length segments of the zoom lens is maintained, and a difference between imaging effects in days and nights is small, and imaging of color images in star-level nights is realized.

Description

technical field [0001] The invention relates to the technical field of lens manufacturing, in particular to a super wide-angle zoom lens with a large image surface. Background technique [0002] With the development of major projects such as "Safe City", "Safe Construction", and "Strengthening Police with Science and Technology" across the country, the nighttime application of monitoring systems is becoming more and more frequent. At present, most of the monitoring zoom lenses used in China are composed of full glass ball lenses, and the aperture value FNo. is 1.6 or 1.8. This kind of lens can get better camera effects when the light is good in the daytime; but in starlight night or dark field Due to the low brightness of the outside world when distinguishing the environment, there are certain limitations in the recognition. [0003] With the introduction of glass aspheric lenses, the lens aperture values ​​FNO1.4 and FNO1.2 are also gradually appearing on the market, but i...

AI Technical Summary

Problems solved by technology

At present, most of the monitoring zoom lenses used in China are composed of full glass ball lenses, and the aperture value FNo. is 1.6 or 1.8. This kind of lens can get better camera effects when the light is good in the daytime; but in starlight night or dark field Due to the low brightness of the outside world when distinguishing the environment, there are certain limitations in the recognition

[0003] With the introduction of glass aspheric lenses, the lens aperture values ​​FNO1.4 and FNO1.2 are also gradually appearing on the market, but in the case of large light transmission, the image quality of the medium focus will be reduced, and with the light transmission As the aperture gradually increases, the image quality of the medium focal length will gradually decrease.

In addition, currently the zoom lens on the market mostly uses the small image area 1 / 3inch system, and the large image area zoom lens is rare.

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