Optical information reproducing by detecting phase shift of elev

Details Optical information reproducing by detecting phase shift of elev Optical information reproducing by detecting phase shift of elev

1995-10-30

1997-06-10

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, 369109, 369 4437, G11B 700

Patent

active

056383550

ABSTRACT:
Digital information is represented by surface designs with features smaller than the wavelength of the reading light on the surface of a record carrier, said designs producing continuously varying phases of the light reflected from them in a given direction. The designs are written by ion beam or electron beam milling of the surface of a master record carrier, then replicated onto a plurality of polymeric record carriers by stamping or molding. The records can also be written by applying light induced compaction of the surface materials.

REFERENCES:
patent: 5285274 (1994-02-01), Tanno et al.
patent: 5471455 (1995-11-01), Jabr
patent: 5493561 (1996-02-01), Nishiuchi et al.

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