Large-aperture infrared confocal optical system

Abstract

The invention discloses a large-aperture infrared confocal optical system. The large-aperture infrared confocal optical system is sequentially provided with a first lens 1 having negative power, a second lens 2 having negative power, a third lens 3 having positive power, a diaphragm aperture A, a fourth lens 4 having positive power, a fifth lens 5 having positive power, a sixth lens 6 having negative power, a seventh lens 7 having positive power, a filter 8, a compensation sheet 9 and an image plane 10 from an object plane to the image plane and can achieve that FN0 is greater than 1.4 but smaller than 2.0. The dispersion coefficient VD4 of the fourth lens 4 and the dispersion coefficient VD6 of the sixth lens 6 meet the condition: VD4 / VD6 is greater than 2.5 but smaller than 4. The colordifference of visible and infrared bands can be better balanced, and a confocal function can be achieved.

Description

【Technical field】 [0001] The patent of the present invention relates to a large aperture infrared confocal optical system. 【Background technique】 [0002] There are existing infrared confocal lenses on the market, the optical FNO is above 2.0, and the infrared visual effect is good under the condition of strong infrared light intensity and light compensation, but it does not meet expectations under the condition of weak light intensity. effect, a lens with a large aperture is required to achieve low-light night vision. [0003] Due to the above-mentioned problems, it is necessary to propose a solution, and the present invention is made under such a background. 【Content of invention】 [0004] The technical problem to be solved by the present invention is to provide a large-aperture infrared confocal optical system for the above-mentioned deficiencies in the prior art. The large-aperture infrared confocal can not only realize the low-light night vision function, but also me...

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Problems solved by technology

[0002] There are existing infrared confocal lenses on the market, the optical FNO is above 2.0, and the infrared visual effect is good under the condition of strong infrared light intensity and light compensation, but it does not meet expectations under the condition of weak light intensity. effect, a lens with a large aperture is required to realize low-light night vision function

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