The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 1985
Filed:
May. 10, 1983
Dietfried Susz, Vienna, AT;
U.S. Philips Corporation, New York, NY (US);
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.