Optical recording/reproducing system using interference techniqu

Details Optical recording/reproducing system using interference techniqu Optical recording/reproducing system using interference techniqu

1989-09-22

1991-10-08

Richardson, Robert C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369 4426, 369103, 369112, G11B 700

Patent

active

050560808

ABSTRACT:
Apparatus and method are disclosed for encoding information and recording same as sets of variably spaced related marks on the optical record. The encoded information is read by illuminating each set of such recorded marks 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 pattern is detected by photosensing diode arrays and after decoding, the system outputs an information signal representing the original information.

REFERENCES:
patent: 3753249 (1973-08-01), Silverman
patent: 3971002 (1976-07-01), Bricot et al.

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