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:
Nov. 11, 2025
Filed:
Dec. 23, 2021
Agc Inc., Tokyo, JP;
Optical Coatings Japan, Tokyo, JP;
Yosuke Sugihara, Tokyo, JP;
Yasuyuki Takimoto, Tokyo, JP;
Takahiro Mashimo, Tokyo, JP;
Atsushi Koyanagi, Tokyo, JP;
Naoto Tatsuoka, Tokyo, JP;
Masaaki Miyake, Tokyo, JP;
Hideaki Takahoshi, Tokyo, JP;
AGC Inc., Tokyo, JP;
Optical Coatings Japan, Tokyo, JP;
Abstract
An optical filter includes a substrate and a dielectric multilayer film laid as an outermost layer on at least one major surface of the substrate. The dielectric multilayer film includes a low-refractive index film and a high-refractive index film provided alternately. At least one film selected from the group consisting of the low-refractive index film and the high-refractive index film satisfies the following optical characteristics (i-1) and (i-2A): (i-1) an extinction coefficient kat a wavelength of 600 nm is 0.12 or larger; and (i-2A) a minimum extinction coefficient kin a wavelength range of 1530 to 1570 nm is 0.01 or smaller; and the optical filter satisfies the following optical characteristic (ii-1A): (ii-1A) light in a wavelength range of 400 to 680 nm is blocked and light in the wavelength range of 1530 to 1570 nm is transmitted.