G - Physics – 11 – B
Patent
G - Physics
11
B
352/21.3
G11B 21/02 (2006.01) G11B 5/592 (2006.01) G11B 21/10 (2006.01) H01L 41/04 (2006.01)
Patent
CA 1211556
24 ABSTRACT: Circuit arrangement for generating an actuating voltage for a piezo-electric element of a positioning device. In a circuit arrangement for generating an ac- tuating voltage for a piezo-electric element (1) of a positioning device, which is intended in particular 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 whose output signal is applied to the primary (10) of a transformer (11), to whose secondary (12) the piezo-electric element is connected 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), which switching signal corresponds in time to only one of the two amplitude peak values of the carrier signal and has a pulse width smaller than half the period of the carrier signal (Fig. 1).
428003
Philips'gloeilampenfabrieken N.v.
Van Steinburg C.e.
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