Recording/reproducing system using wavelength/depth selective op

Details Recording/reproducing system using wavelength/depth selective op Recording/reproducing system using wavelength/depth selective op

Filed on

1990-11-16

Date issued

1994-01-11

Examiner

Brier, Jeffery

Patent Class

Dynamic information storage or retrieval

SubClass

Specific detail of information handling portion of system

SubSubClass

Radiation beam modification of or by storage medium

Other Related Categories

369 4426, 369109, 369103, 369112, G11B 700

Type

Patent

Status

active

Patent number

052788164

Description

ABSTRACT:
Apparatus and method for encoding information and recording same as sets of variably spaced related marks stored in wavelength (color) and/or depth selective layers on the optical record wherein the encoded information is read by illuminating each set of such recorded marks selected by wavelength (color) or focal depth with a coherent read light to cause an optical interference pattern consisting of a varying distribution of amplitude maxima separated by amplitude nulls (or minimas) that change in accordance with the encoded information. This read interference pat-tern is detected by photosensing diode arrays and after decoding, the system outputs an information signal representing the original information.

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