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:
Dec. 11, 2007
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
A hologram is recorded by irradiating, with a reference light beam, a region corresponding to an intensity distribution of a signal light beam on an optical recording medium. For example, the reference light beam having the intensity distribution which substantially coincides with the intensity distribution of the signal light beam is generated, and only the region which substantially coincides with the region irradiated by the signal light beam (i.e., the signal light beam defocused region) is irradiated with the reference light beam. This enables only the necessary region to be exposed and the regions which need not be exposed not to be exposed. Accordingly, the hologram can be recorded without losing information of the signal light beam and thus high-density recording can be realized.