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. 15, 2014
Filed:
Aug. 06, 2008
Kenichi Shimada, Yokohama, JP;
Tatsuro Ide, Kawasaki, JP;
Takeshi Shimano, Moriya, JP;
Harukazu Miyamoto, Higashimurayama, JP;
Kenichi Shimada, Yokohama, JP;
Tatsuro Ide, Kawasaki, JP;
Takeshi Shimano, Moriya, JP;
Harukazu Miyamoto, Higashimurayama, JP;
Hitachi Consumer Electronics Co., Ltd., Tokyo, JP;
Abstract
A holographic recording medium in which information can be reproduced by phase conjugate beam without requiring a mirror for obtaining the phase conjugate beam and its driving part and recording density is not reduced. The recording medium includes a recording layer in which an interference pattern is recorded and a light absorption/transmission layer which can be reversibly changed to be in a first state where signal beam and reference beam passed through the recording layer are absorbed at the time of recording of information and a second state where the reference beam is transmitted at the time of reproduction of information, and the reference beam transmitted through the light absorption/transmission layer is reflected by a reflection layer to produce the phase conjugate beam.