Optical disc having information pits in form of plurality of fra

Details Optical disc having information pits in form of plurality of fra Optical disc having information pits in form of plurality of fra

1992-12-29

1994-10-25

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, 3692753, G11B 726

Patent

active

053595912

ABSTRACT:
An optical disc has an information recording surface on which information is recorded, the information being read out and reproduced by irradiating a laser light having predetermined wavelength under the condition of a predetermined numerical aperture and receiving a diffracted and reflected laser light. The disc includes a track spirally formed on the information recording surface and extending in a disc peripheral direction, a plurality of information units formed on the track each having predetermined unit lengths in both of the disc peripheral direction and a disc radial direction. The information is recorded in the form of an information pit in each of the information units. The information pits have a plurality of pit patterns each of which is formed as combination of four pit fragments having the substantially same shape. Each of the pit fragment has a predetermined optical pit height and a plane figure which is symmetrical with respect to one of a first line or a second line, the first line passing through center points of each of the information units and extending in the disc peripheral direction, the second line passing through the center point and extending in the disc radial direction.

REFERENCES:
patent: 4896313 (1990-01-01), Hirose et al.
patent: 4956214 (1990-09-01), Imataki et al.
patent: 5200941 (1993-04-01), Matoba et al.

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