Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1995-07-20
1997-03-04
Dinh, Tan
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 94, 369281, G11B 724
Patent
active
056087152
ABSTRACT:
A multi-layered disk which can improve a data recording density and also can record signals and allow reading and reproduction of the recorded signals in good conditions and a recording system as well as a reproducing system using the same and a multi-layered recording disk in which a plurality of data recording surfaces are laminated. In a band wherein, against an MTF level obtained when a read light is on-focus to one of the data recording surfaces, an MTF level obtained when the read light is defocusing to other data recording surfaces is 1/N (N is a real number larger than 1), data signals are recorded in each of the data recording surfaces. A distance t between each data recording surface, numerical aperture NA of an objective lens guiding a read light to any of the data recording surfaces, a wavelength.lambda. of the read light, an equivalent refractive index n between each data recording surface, and a number i of laminated data recording surfaces satisfy the following relation:
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Ohsawa Seiichi
Yokogawa Fumihiko
Dinh Tan
Pioneer Electronic Corporation
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