Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1981-11-20
1984-06-19
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 84, 36013024, G11B 552, G11B 2104
Patent
active
044555849
ABSTRACT:
To permit recording of digital data in a digital code using d-c level, particularly for recording of digital video data by a rotating video transducer (4, 5, 29) on a rotating head wheel (6) of a scanner, without degradation of recorded signals due to d-c shift upon an extended sequence of bits of the same polarity, two current generators (30, 31) are provided, each supplying a current of opposite polarity, connected to a logic circuit which connects, selectively, current of the respective polarity in accordance with the respective bit to the transducer, so that, at each time, and corresponding to the respective bit, the current through the transducer will be of sufficient magnitude to change the magnetic properties of the magnetic tape (T), then in contact with the transducer, to saturation in the direction controlled by the direction of current flow through the transducer head. A d-c restoring clamping circuit (27) and logic control circuit (34, 35) to control the current switches (32, 33) is located as a unit (12) on the head wheel (6) itself, which receives the signals via non-contacting transducers (9, 23, 24). A non-contacting power supply (26, 40) transfers power from the stator (20) to the rotor (21) of the scanner (1, 2).
REFERENCES:
patent: 4005483 (1977-01-01), Kuwano
patent: 4249219 (1981-02-01), Aoi et al.
patent: 4293880 (1981-10-01), Tsukada et al.
patent: 4319294 (1982-03-01), Repp
Psitos Aristotelis M.
Robert & Bosch GmbH
Wong K.
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