Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1983-05-10
1985-04-30
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
310317, G11B 2102
Patent
active
045147736
ABSTRACT:
A circuit arrangement for generating an actuating voltage for a piezo-electric element (1) of a positioning device intended for positioning a recording and/or reproducing head relative to an information track. A control signal whose amplitude is representative of a positional error is applied to a signal conversion stage (7) in the form of an amplitude modulator. The modulator output signal is applied to the primary (10) of a transformer (11). The piezo-electric element is connected to the secondary (12) via a bipolar switching device (13) which is actuated by a periodic pulse-shaped switching signal which, by means of a pulse-shaper stage (20), is derived from a carrier signal supplied by an oscillator (18). The switching signal corresponds in time to only one of the two peak amplitude values of the carrier signal and has a pulse width less than half the period of the carrier signal.
Franzblau Bernard
Mayer Robert T.
Stellar George G.
U.S. Philips Corporation
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