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:
Apr. 29, 2025
Filed:
Jul. 12, 2022
Seiko Epson Corporation, Tokyo, JP;
Tomoki Sakashita, Shiojiri, JP;
Teruyuki Nishimura, Matsumoto, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
An interference filter includes a transmissive first substrate including a first inner surface and a first outer surface facing each other, in which the first inner surface is provided with a first reflection film, a transmissive second substrate including a second inner surface and a second outer surface facing each other, in which the second inner surface is provided with a second reflection film, a first bonding portion configured to bond the first inner surface and the second inner surface to each other, and seal a first inner space between the first substrate and the second substrate, a transmissive third substrate facing the first outer surface, a second bonding portion configured to bond the first outer surface and the third substrate to each other, and seal a second inner space between the first substrate and the third substrate, a transmissive fourth substrate facing the second outer surface, and a third bonding portion configured to bond the second outer surface and the fourth substrate to each other, and seal a third inner space between the second substrate and the fourth substrate, wherein the first inner space, the second inner space, and the third inner space are lower in pressure than atmospheric pressure.