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:
May. 31, 2005
Filed:
Sep. 21, 2004
Applicants:
Mitsutoshi Honda, Hitachi, JP;
Yuichi Sawai, Hitachi, JP;
Hideto Momose, Hitachiohta, JP;
Hiroyuki Akata, Hitachi, JP;
Takashi Naito, Mito, JP;
Inventors:
Mitsutoshi Honda, Hitachi, JP;
Yuichi Sawai, Hitachi, JP;
Hideto Momose, Hitachiohta, JP;
Hiroyuki Akata, Hitachi, JP;
Takashi Naito, Mito, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F001/00 ;
U.S. Cl.
CPC ...
Abstract
An optical device is capable of changing signal light to a plurality of paths. The device includes a film, a heating source attached to the film, and a heat radiator plate attached to the other portion of the film. The refractive index of the film varies according to heat excitation, and the film comprises crystal grains of an oxide and amorphous portions present between the crystal grains.