METHOD AND APPARATUS FOR INFORMATION RETRIEVAL FROM AN OPTICALLY READABLE STORAGE MEDIUM

摘要

A method and apparatus for selectably retrieving information from any of a plurality of spirally-formed information tracks formed in a video disc (10) by means of controlling a carriage (24) for translating the video disc in a forward or a reverse direction relative to radiant beam information recovery means (14) in a video disc player. Each information track is identified by a unique address and means are provided for selecting the address of a particular track to be retrieved. A prescribed sequence of drive signals is applied to a carriage motor (28) dependent on the distance to be travelled by the carriage to retrieve the selected information, the drive signals being successively stepped downward to intermittently redetermine carriage motor speed as predetermined location thresholds are reached during carriage translation.