INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER

**Definition:** This place covers:

Recording or playback of information by relative movement between a record track and a transducer, the transducer directly producing, or being directly actuated by, modulation in the track being recorded or played-back, and the extent of modulation corresponding to the signal being recorded or played-back;

Apparatus and machines for recording or playback, and parts thereof, such as heads;

Record carriers for use with such apparatus and machines;

Associated working of other apparatus with such apparatus and machines.

**Limiting references (this place does not cover):** - Recording measured values in a way that does not require playback through a transducer -> G01D9/00 - Recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards -> G06K - Transferring data from one type of record carrier to another type of record carrier -> G06K1/18 - Circuits for coupling output of reproducer to radio receiver -> H04B1/20 - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor -> H04R

**Glossary:** - Record carrier: means a body, such as a cylinder, disc, card, tape, or wire, capable of permanently holding information, which can be read-off by a sensing element movable relatively to the record carrier - Head: includes any means for converting sinusoidal or non-sinusoidal electric wave-forms into variations of the physical condition of at least the adjacent surface of the record carrier, or vice versa - Near-field interaction: means a very short distance interaction using scanning-probe techniques, e.g. quasi- contact or evanescent contact between head and record carrier