Record carrier with an optically readable trackwise-arranged inf

Details Record carrier with an optically readable trackwise-arranged inf Record carrier with an optically readable trackwise-arranged inf

1980-03-10

1989-06-13

Richardson, Robert L.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369100, 369109, 358342, G11B 700

Patent

active

048398829

ABSTRACT:
A record carrier is described with an optically readable trackwise-arranged information structure, and an apparatus for reading said carrier. The distances between the tracks of the information structure vary so that by projecting, in addition to a read spot, at least one address spot to the information structure of a size such that is spans a number of tracks approximately equal the quotient of the average track distance and the amplitude of the track distance variation, the read spot can be rapidly addressed to a specific group of tracks. This is done with the aid of two detectors which are disposed in the path of the address-beam radiation which is diffracted in a first order by the information structure in a direction transverse to the track direction.

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