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. 11, 2010
Filed:
Apr. 25, 2008
Hiroyasu Yoshikawa, Kawasaki, JP;
Koichi Tezuka, Kawasaki, JP;
Kazushi Uno, Kawasaki, JP;
Yasumasa Iwamura, Kawasaki, JP;
Yuzuru Yamakage, Kawasaki, JP;
Hiroyasu Yoshikawa, Kawasaki, JP;
Koichi Tezuka, Kawasaki, JP;
Kazushi Uno, Kawasaki, JP;
Yasumasa Iwamura, Kawasaki, JP;
Yuzuru Yamakage, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A hologram recorder is provided, in which coherent light from a light source is split into a signal beam and a reference beam, and the signal beam is modulated by a spatial light modulator to be directed to a hologram recording medium, while the reference beam is directed to the hologram recording medium to overlap with the signal beam for recording a hologram on the hologram recording medium. The hologram recorder includes a beam phase modulator provided with a plurality of optical devices (') each configured to assume one of two modes such as ON mode and OFF mode, the ON mode for causing the reference beam to be passed or reflected in a predetermined direction toward the hologram recording medium, the OFF mode for causing the reference beam to be blocked or directed in another direction other than the predetermined direction. Each optical device (′) provides a phase difference 0 or π. A phase modulation controller is also provided for individually controlling the optical devices (′) to cause each of the optical devices to assume the ON mode or the OFF mode, thereby modulating the reference beam into a beam having a predetermined phase pattern.