Optical disc apparatus and method for reproducing information

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

Reexamination Certificate

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C369S053230, C369S094000

Reexamination Certificate

active

07869330

ABSTRACT:
An optical disc apparatus reproducing information on the basis of a standing wave recorded on a disc-like volume type recording medium includes: a first focus position adjusting unit configured to adjust the position of a focus on which a first light beam focuses inside a recording layer inside the volume type recording medium in the optical axis direction of the first light beam; a second focus position adjusting unit configured to adjust the position of a focus on which a second light beam focuses inside the recording layer in the optical axis direction of the second light beam; a controller configured to control the first focus position adjusting unit and the second focus position adjusting unit; and first and second detectors configured to detect the first and second reproduction light beams.

REFERENCES:
patent: 7394745 (2008-07-01), Miyatake
patent: 7505389 (2009-03-01), Nishiwaki et al.
patent: 7576900 (2009-08-01), Lan et al.
U.S. Appl. No. 12/038,201, filed Feb. 27, 2008, Fujita, et al.

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