A wide-band infrared optical system

By designing a wide-band infrared optical system using only zinc sulfide and sulfur-based glass materials, and using a specific lens combination to achieve correction of the color difference in the 1-5 μm band, the problem of poor imaging quality in this band is solved, and excellent imaging quality and simple structure effect is achieved.

CN115421277BActive Publication Date: 2025-05-27SUZHOU ORIENTAL CROTO OPTOELECTRONIC TECH CO LTD
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Patent Information

Application Number
CN202210973371.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-15
Publication Date
2025-05-27
Estimated Expiration
2042-08-15

AI Technical Summary

Technical Problem

The existing wide-band infrared optical systems are difficult to effectively correct chromatic aberration in the 1-5μm band, and the structure is complex and the imaging quality is poor.

Method used

A wide-band infrared optical system is designed, using only two materials: zinc sulfide and sulfur-based glass materials. By setting a positive power meniscus lens L1, a negative power meniscus lens L2 and a positive power meniscus lens L3, the correction of the color difference in the 1-5μm band is achieved.

Benefits of technology

The wide band imaging is achieved in the 1-5μm band. The structure is simple and easy to adjust, the imaging quality is excellent, and the chromatic aberration and other monochromatic aberrations can be effectively corrected, with small distortions, and 100% cold aperture efficiency.

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Abstract

The present invention relates to a wide-band infrared optical system. Along the optical axis of this optical system, a positive-power meniscus lens L1, a negative-power meniscus lens L2, a positive-power meniscus lens L3, a filter, a detector protection window, a diaphragm and an image plane are sequentially arranged from the object side to the image side; the front surface of the positive-power meniscus lens L1 is an aspherical surface, the front surface of the negative-power meniscus lens L2 is a diffractive surface, and the surfaces of other lenses are spherical surfaces; the negative-power meniscus lens L2 is made of a chalcogenide glass material, and other optical elements are made of zinc sulfide. The structure of the present invention is simple and easy to assemble and align, the imaging quality is excellent, chromatic aberration and other monochromatic aberrations can be corrected well, the distortion is small, and 100% cold stop efficiency can be achieved.
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