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:
Oct. 27, 2020
Filed:
Feb. 27, 2019
Usound Gmbh, Graz, AT;
Andrea Rusconi Clerici Beltrami, Vienna, AT;
Ferruccio Bottoni, Graz, AT;
Drago Strle, Ljubljana, SI;
USOUND GMBH, Graz, AT;
Abstract
A method for operating a piezoelectric speaker for generating sound waves in the audible wavelength spectrum and/or in the ultrasonic range includes at least partially charging a piezo actuator of the piezoelectric speaker with electrical energy of an energy unit and then at least partially discharging the piezo actuator. The method also includes determining at least one present electrical piezo actuator voltage of the piezo actuator. A future input voltage for the piezo actuator is compared with the present electrical piezo actuator voltage prior to charging and/or discharging, and a future differential voltage is derived therefrom. Furthermore, an embodiment of the method can include returning a part of the energy needed to charge the piezo actuator to the energy unit during discharging.