Optical disc having information units comprising a plurality of

Details Optical disc having information units comprising a plurality of Optical disc having information units comprising a plurality of

1994-06-30

1995-11-14

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, G11B 370

Patent

active

054673399

ABSTRACT:
An optical disc is provided with: a disc substrate having a disc shape; a recording surface formed on the disc substrate and having a spiral or coaxial track with a predetermined track pitch; a plurality of information units formed on the track, each of which has a predetermined unit length in a circumferential direction and a radial direction of the optical disc respectively; and a pit formed in each of the information units, for recording information by converting the information in a shape of the pit, the pit having one of a plurality of shapes comprising a combination of presence and absence of 4 pit pieces, each of the pit pieces being separated from each other and disposed outside of an area, which is approximately shaped in a X letter in the information unit and includes a unit center of the information unit.

REFERENCES:
patent: 5331623 (1994-07-01), Matoba et al.
patent: 5337301 (1994-08-01), Sugiura et al.
patent: 5357499 (1994-10-01), Nomoto
patent: 5359591 (1994-10-01), Nomoto

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