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:
Aug. 17, 2004
Filed:
Nov. 30, 2001
Applicant:
Inventors:
Takuma Aoki, Tokyo, JP;
Kouki Sato, Tokyo, JP;
Nobuyuki Shibata, Tokyo, JP;
Toshimitsu Nishiwaki, Tokyo, JP;
Mizuki Oike, Tokyo, JP;
Assignee:
The Furukawa Electric Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B 9/00 ; G02B 5/22 ; G02B 6/00 ;
U.S. Cl.
CPC ...
G02B 9/00 ; G02B 5/22 ; G02B 6/00 ;
Abstract
An optical attenuator ( ) has a substrate (glass substrate) ( ) and an optical attenuation film ( ) that attenuates an input light with a predetermined optical attenuation factor, and the optical attenuation film ( ) is disposed on a light input face ( ) of the substrate ( ). An angle defined by the light input face ( ) and the light output face ( ) of the substrate ( ) is set to 0.15° to 0.5°. A protective film ( ) for preventing the deterioration of the optical attenuation film ( ) is formed on a surface of the optical attenuation film ( ).