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

1995-02-08

1997-08-12

Krynski, William

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428 642, 428 644, 428913, 43027011, 4304951, 430945, 3692751, 3692753, B32B 300

Patent

active

056563485

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

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