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. 11, 1987
Filed:
Jan. 16, 1984
Yukuo Nishimura, Sagamihara, JP;
Eigo Kawakami, Kawasaki, JP;
Toshiaki Asano, Yokohama, JP;
Masahiro Haruta, Funabashi, JP;
Hiroshi Takagi, Yokohama, JP;
Takashi Noma, Tokyo, JP;
Nobutoshi Mizusawa, Yokohama, JP;
Mitsunobu Nakazawa, Tokyo, JP;
Kunitaka Ozawa, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical device comprises an optical waveguide constituted of as a basic unit a core layer of a material having a relatively high refractive index and a clad layer of a material having a relatively low refractive index and covering said core layer, and heating means for heating said core layer to change the refractive index thereof, characterized in that when said core layer is constituted of a liquid, said core layer is heated by said heating means to a temperature such that said core layer does not boil.