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:
Jan. 01, 2008
Filed:
May. 04, 1999
P. S. Ramanujam, Roskilde, DK;
Sören Hvilsted, Horsholm, DK;
Pál Koppa, Budapest, HU;
Emöke Lörincz, Budapest, HU;
Péter Richter, Budapest, HU;
Gábor Szarvas, Budapest, HU;
P. S. Ramanujam, Roskilde, DK;
Sören Hvilsted, Horsholm, DK;
Pál Koppa, Budapest, HU;
Emöke Lörincz, Budapest, HU;
Péter Richter, Budapest, HU;
Gábor Szarvas, Budapest, HU;
Riso National Laboratory, , DK;
Abstract
The invention relates to a method for the recording and reading of data with a holographic write/read apparatus onto a holographic recording medium with a thin holographic recording layer. The medium is preferably an optical card (). The recording of the information is in the form of data pages stored as thin Fourier holograms (). According to the invention, it is foreseen to use reflected transmission and polarisation holography with different write and read wavelengths, and to correct during reading the distortion in the readout channel caused by the difference between the write and read wavelengths. The invention further relates to an apparatus and system for performing the method. There is also disclosed a method of coding the recorded information.