The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 03, 2020
Filed:
May. 20, 2016
Konica Minolta, Inc., Chiyoda-ku, Tokyo, JP;
Makoto Jin, Sakai, JP;
KONICA MINOLTA, INC., Tokyo, JP;
Abstract
This infrared optical system using the wavelength range of 3 to 5 μm comprises, in the order from an object side, a first lens having a negative power and formed with a convex meniscus toward an object, a second lens that is convex on both sides, and a cold aperture. A bandpass filter is provided between the second lens and the image surface. The first and second lenses are configured with silicon or germanium with each provided with an aspheric surface at least on one side. The infrared optical system satisfies the conditional expressions: 0.1 μm<λ2−λ1<1 μm, 3 μm<λ1<5 μm, and 3 μm<λ2<5 μm. (Where λ1 and λ2 respectively represent a wavelength near the shorter wavelengths and a wavelength near the longer wavelengths in a half width of the transmission wavelength region of the bandpass filter).