Optical recording medium and its recording apparatus and reprodu

Details Optical recording medium and its recording apparatus and reprodu Optical recording medium and its recording apparatus and reprodu

1997-03-26

1998-06-16

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 49, G11B 700

Patent

active

057682437

ABSTRACT:
An optical recording medium which is constructed in a manner such that a plurality of recording areas in which an information signal is recorded along vortical spiral tracks are arranged in a ring shape on a recording surface and a vortex direction of the spiral track of the outside recording area among the plurality of recording areas differs from that of the spiral track of the inside recording area. When the information signal is recorded to the recording medium, the first writing device executes the writing operation from the outer rim side toward the inner rim side of the spiral track of the outside recording area and the second writing device executes the writing operation from the inner rim side toward the outer rim side of the spiral track of the outside recording area. When the recorded information signal is reproduced, the first reading device executes the reading operation from the outer rim side toward the inner rim side of the spiral track of the outside recording area and the second reading device executes the reading operation from the inner rim side toward the outer rim side of the spiral track of the outside recording area.

REFERENCES:
patent: 4420828 (1983-12-01), Yoshida et al.
patent: 4534021 (1985-08-01), Smith
patent: 4903151 (1990-02-01), Mizukami et al.
patent: 5343453 (1994-08-01), Ogino
patent: 5493548 (1996-02-01), Kamioka
patent: 5506825 (1996-04-01), Gushima et al.
patent: 5619387 (1997-04-01), Ottesen et al.
patent: 5633847 (1997-05-01), Masuda et al.

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