Optical: systems and elements – Holographic system or element – Having particular recording medium
Reexamination Certificate
2006-01-30
2008-12-23
Assaf, Fayez G (Department: 2872)
Optical: systems and elements
Holographic system or element
Having particular recording medium
C359S006000, C369S044110
Reexamination Certificate
active
07468822
ABSTRACT:
This invention is a holographic recording medium including a track in which position information to specify a recording position and a reproducing position of page data is formed. The position information of the track is formed of position detection patterns. The position detection patterns each including a first detection mark row including center pits arranged at predetermined intervals; and a second detection mark row including side marks arranged at the same intervals as the intervals of the center pits, the side marks having lengths substantially corresponding to integral multiples of the intervals of the center pits. The second detection mark row is arranged adjacent to the first detection mark row such that both ends of the side marks are arranged so as to correspond to the center pits in a track width direction, and page data is recorded and reproduced on the basis of positions of the center pits or positions of the ends of the side marks.
REFERENCES:
patent: 2004/0027668 (2004-02-01), Ayres et al.
patent: 2007/0195664 (2007-08-01), Kadowaki et al.
patent: 2001-031395 (2001-02-01), None
Kanaoka Toshikazu
Uchida Akiyoshi
Assaf Fayez G
Fujitsu Limited
Greer Burns & Crain Ltd.
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