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:
Sep. 16, 2008
Filed:
Feb. 23, 2004
Katsunori Kawano, Ashigarakami-gun, JP;
Jiro Minabe, Ashigarakami-gun, JP;
Shin Yasuda, Ashigarakami-gun, JP;
Tatsuya Maruyama, Minato-ku, JP;
Norie Matsui, Ashigarakami-gun, JP;
Katsunori Kawano, Ashigarakami-gun, JP;
Jiro Minabe, Ashigarakami-gun, JP;
Shin Yasuda, Ashigarakami-gun, JP;
Tatsuya Maruyama, Minato-ku, JP;
Norie Matsui, Ashigarakami-gun, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
The present invention discloses a hologram erasing method, in which a predetermined hologram is erased by irradiating a predetermined region of a hologram recording medium in which the hologram to be erased is recorded with a reference light beam and a signal light beam holding a random data pattern at the same time. In this method, the signal light beam and the reference light beam interfere with each other in the medium, and a Fourier transform hologram recorded in the region where the interference occurs is destroyed and erased by interference light beam. That is, a data page for erasing including a random pattern is overwritten to erase an original data page. According to the present invention, the hologram recorded in the optical recording medium can be selectively and completely erased in a simple method.