Optical: systems and elements – Holographic system or element – Hardware for producing a hologram
Reexamination Certificate
2007-04-17
2007-04-17
Boutsikaris, Leonidas (Department: 2872)
Optical: systems and elements
Holographic system or element
Hardware for producing a hologram
C359S022000, C369S103000
Reexamination Certificate
active
10800607
ABSTRACT:
A holographic recording and reproducing method for recording holographic data in and reproducing holographic data from a holographic recording medium including a recording layer in which data are to be recorded as phase information of light by projecting a signal beam and a reference beam thereonto and an optical modulation pattern periodically formed in a direction of a track on a surface located on the opposite side of the recording layer as viewed in the direction of signal beam and reference beam incidence on the holographic recording medium, the holographic recording and reproducing method including a step of projecting a light beam for servo control onto the holographic recording medium so as to substantially focus onto the surface on which the optical modulation pattern is formed, thereby generating clock signals in synchronism with the optical modulation pattern.According to the thus constituted holographic recording and reproducing method, it is possible to generate accurate clock signals and remove noise superposed on a reproduced light beam.
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Boutsikaris Leonidas
Seed IP Law Group PLLC
TDK Corporation
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