| 摘要 |
<p>A thermoplastics data storage member (1) carrying information (5) which can be imaged, using non-coherent light, and, in addition to and distinct from that information, control data (7, 8, 9) which define the first co-ordinate of a two-co-ordinate system for the member (1). The second co-ordinate is defined by the processing apparatus itself, independent of the storage member (1).</p><p>A reading apparatus comprises a non-laser optical system for imaging selected areas of the information, and a servo-system, including a micro-processor and transducers for reading the control data and for positioning a reading head of the optical system in desired locations relative to the storage member.</p> |
