INFRARED OPTICAL SYSTEM AND DEVICE

摘要

PROBLEM TO BE SOLVED: To suppress chromatic aberration and thermal aberration by composing an optical system of two or more lenses using two or more kinds of materials although a conventional infrared optical device can not have chromatic aberration and thermal aberration suppressed when not having an optical system including three or more lenses using three or more kinds of materials. SOLUTION: In an infrared optical device comprising a refraction optical system which converges an incident infrared radiation from an object to be imaged and a detector, an optical system is composed of two or more lenses using two or more materials as the refraction optical system which makes the incident infrared radiation incident on the detector to correct both chromatic aberration and aberration due to temperature at the same time, so incident infrared radiations differing in wavelength are imaged at nearly the same imaging positions, which have nearly no shift even when the temperature varies. COPYRIGHT: (C)2008,JPO&INPIT