Optical disc having square information pits arranged in symmetri

Details Optical disc having square information pits arranged in symmetri Optical disc having square information pits arranged in symmetri

1995-09-18

1996-11-05

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369109, 3692751, G11B 724

Patent

active

055725082

ABSTRACT:
An optical disc is provided with a plurality of information units arranged in the circumferential direction on the track, each of which has a square shape, and has a predetermined unit length in the circumferential direction and a predetermined unit length in the radial direction. A plurality of surface deformed portions are formed each in one of the information units respectively and comprises a plurality of surface deformed pieces having substantially the same size. The surface deformed portions have at least M kinds of forms, which are different in directions of M kinds from each other by combinations of the surface deformed pieces. Each of the surface deformed portions has a plane figure form substantially symmetrical with respect to a straight line passing through a center point of the information unit, and each of the surface deformed portions having a predetermined optical height or depth.

REFERENCES:
patent: 4896313 (1940-01-01), Hirose et al.
patent: 4956214 (1990-09-01), Imataki et al.
patent: 5200941 (1993-04-01), Matoba et al.
patent: 5249175 (1993-09-01), Akahira et al.
patent: 5260930 (1993-11-01), Maeda
patent: 5331623 (1994-07-01), Matoba et al.
patent: 5331626 (1994-07-01), Sugiura
patent: 5359591 (1994-10-01), Nomoto

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