Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks... – Having layered storage medium
Reexamination Certificate
2004-11-23
2010-06-15
Klimowicz, William J (Department: 2627)
Dynamic information storage or retrieval
Systems having plural physically distinct independent tracks...
Having layered storage medium
C369S047400
Reexamination Certificate
active
07738340
ABSTRACT:
An optical system has an objective lens condensing a light beam from the light source on a recording layer selected from the plurality of recording layers of the optical disk, and leading a returning light beam reflected by the selected recording layer to a predetermined position; an aberration detecting part detecting a physical amount relative to spherical aberration based on an output signal of the photodetector; an aberration correcting part correcting the spherical aberration based on the physical amount; and a processing device carrying out at least the information reproduction o from among information recording, information reproduction and information deletion with the use of the output signal of the photodetector.
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Machine-assisted translation of JP 08-096406.
Hirai Hideaki
Ogata Tetsuya
Danielsen Nathan
Dickstein & Shapiro LLP
Klimowicz William J
Ricoh & Company, Ltd.
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