Optical data storage.

摘要

A data storage member (1) comprises recording material for recording information (5) which can be imaged using non-coherent light and in addition to and distinct from that information, the member has control data (7, 8, 9) which defines a two-co-ordinate system for the member to provide for random access to the information. A reading recording apparatus comprises a non-laser optical system for imaging onto selected areas and a servo-system, including a microprocessor and transducers, for reading the control data and for positioning a head of the optical system in desired locations relative to the storage member. The invention affords cheap optical data bases recordable and readable by apparatus not requiring a laser optical system.