Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-08-24
2009-06-02
Hindi, Nabil Z (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S094000, C369S044230
Reexamination Certificate
active
07542396
ABSTRACT:
To achieve stable, high capacity, high speed recording. Of two light beams emitted from a light irradiation means, one or two beams are made pass through an optical path changeable member whereof at least one of the thickness and refractive index changes continuously or in two or more steps immediately after emission from the light irradiation means, so that a difference is introduced into the optical path length of the two beams, and the focusing point of one beam is made to vary to coincide with a position in the recording layer used for playback or recording. Another light beam is used for servo. Converging of light during recording or read of a multilayer recording medium is performed with higher precision than in the prior art, so higher density, higher capacity recording/playback can be performed.
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Ishii Hitoshi
Kamisada Toshimasa
Nakatsuka Shin'ichi
Ogino Yoshiaki
Shimano Takeshi
Antonelli, Terry Stout & Kraus, LLP.
Hindi Nabil Z
Hitachi , Ltd.
Hitachi Computer Peripherals Co., Ltd
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