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. 23, 2011
Filed:
Feb. 27, 2008
Tatsuro Ide, Kawasaki, JP;
Kenichi Shimada, Yokohama, JP;
Masahiko Takahashi, Uenohara, JP;
Takeshi Shimano, Yokohama, JP;
Kevin R. Curtis, Longmont, CO (US);
Ken E. Anderson, Boulder, CO (US);
Tatsuro Ide, Kawasaki, JP;
Kenichi Shimada, Yokohama, JP;
Masahiko Takahashi, Uenohara, JP;
Takeshi Shimano, Yokohama, JP;
Kevin R. Curtis, Longmont, CO (US);
Ken E. Anderson, Boulder, CO (US);
Hitachi, Ltd., Tokyo, JP;
InPhase Technologies Inc., Longmont, CO (US);
Abstract
An optical pickup for recording a hologram by using an angle multiplexing method. An optical beam is separated into two beams, a signal beam and a reference beam having different convergence/divergence degrees, by using an optical component such as a diffraction lens. The signal and reference beams are made incident upon the same objective, and the optical component or the objective lens is moved in a direction perpendicular to an optical axis, to thereby realize angle multiplex recording. If an optical information recording medium is inclined, the optical component or the objective lens is moved along the direction along which the optical information recording medium moved to change an angle of the reference beam incident upon the optical information recording medium and compensate for degradation of a reproduction signal.