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:
Nov. 13, 2001
Filed:
Aug. 02, 1999
Katsunori Kawano, Nakai-machi, JP;
Mitsuhiro Ishibe, Nakai-machi, JP;
Tsutomu Ishii, Nakai-machi, JP;
Takehiro Niitsu, Nakai-machi, JP;
Kazuo Baba, Nakai-machi, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
Binary two-dimensional digital data can be recorded in an optical recording medium as holograms in such a way that a recording area is made sufficiently minute correspondingly to the two-dimensional digital data by adequately limiting the spread of signal light and reference light without causing loss of the data and a read error during reconstructing. Signal light of a binary two-dimensional digital data image is subjected to Fourier transform by a lens. There is disposed forwardly of an optical recording medium a shading material having a circular, semicircular, sectorial, or L-shape light transmission part,that allows transmission of only components of 0th to n-th (n=1, 2, or 3) orders. The signal light after Fourier transform and reference light are transmitted through the light transmission part,for irradiation to the optical recording medium and a Fourier transform hologram is recorded in the optical recording medium.