Optical disk reading method for multi-layered optical disk syste

Details Optical disk reading method for multi-layered optical disk syste Optical disk reading method for multi-layered optical disk syste

1997-12-10

1999-06-01

Edun, Muhammad N.

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

369 93, 369112, G11B 700

Patent

active

059094222

ABSTRACT:
A multi-layered optical disk reading method which makes possible to reproduce encoded data from each data layer by focusing laser beam precisely onto a data layer of the multi-layered optical disk. After a multi-layered optical disk is loaded, a central processing unit (CPU) receives an operator's signal to access certain data layer. Then the CPU refers to stored data in the CPU's memory for a diffraction angle to focus laser beam onto a certain data layer. The CPU retrieves an operational coded signal, and transmits the signal to a liquid crystal diffraction device to modulate the liquid crystal diffraction device to deflect and focus the laser beam onto the certain data layer. After the liquid crystal diffraction device is modulated by the operational signal from the CPU, the CPU also operates a routing circuit to transmit read-out signal from a detector which receives reflected laser beam from the certain data layer, to a selected decoding circuit in a data processor.

REFERENCES:
patent: 5062098 (1991-10-01), Hori et al.
patent: 5202875 (1993-04-01), Rosen et al.
patent: 5594713 (1997-01-01), Komma et al.
patent: 5748603 (1998-05-01), Kim et al.

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