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:
Aug. 17, 1999
Filed:
May. 13, 1997
Aisan Kogyo Kabushiki Kaisha, , JP;
Abstract
This invention provides a method for driving intermittently a vibrator having a resonance frequency with the resonance frequency in which the vibration of the resonance frequency is attenuated promptly after the ending of driving with the resonance frequency and the vibration of the resonance frequency increases promptly after the starting of driving with the resonance frequency. Further, this invention provides a method for driving powder feeders using ultrasonic motors which are easy to control powder feed rates and further provides powder feeders. A powder feed pipe is attached to an ultrasonic motor the end of which is elliptically vibrated with the resonance frequency, and powder P is fed from the hopper body when AC voltages of the resonance frequency and non-resonance frequency are applied alternately to the piezoelectric element 1 of the ultrasonic motor.