Optical data storage medium having interference and flattening l

Details Optical data storage medium having interference and flattening l Optical data storage medium having interference and flattening l

1990-10-15

1992-03-10

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369288, 369286, 3692755, 3692751, 3461351, 428694, 430945, G11B 724

Patent

active

050954784

ABSTRACT:
An optical data storage medium having a substrate, and an optical storage layer with a recording track or tracks for storing information to be read by a light beam. An interference layer is formed on the substrate, such that a tracking reflector defining the recording track or tracks is formed on the interference layer. A flattening layer is formed on the interference layer such that the flattening layer covers the tracking reflector and provides a flat surface on which the storage layer is formed. Each of the interference and flattening layers has a thickness substantially equal to 80 /8 or (.lambda./8+m.multidot..lambda./2), where .lambda. represents a wavelength of the light beam as measured while the light beam is travelling through the interference and flattening layers, and m represents a natural number.

REFERENCES:
patent: 4569881 (1986-02-01), Freese et al.
patent: 4737877 (1988-04-01), Krongelb et al.
patent: 4839226 (1989-06-01), Sawada et al.
patent: 4875987 (1989-10-01), Wada et al.
patent: 4985885 (1991-01-01), Ohta et al.
patent: 5041356 (1991-08-01), Takeda et al.

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