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:
Jan. 25, 2000
Filed:
Nov. 18, 1998
Motoyasu Yano, Toyohashi, JP;
Asmo Co., Ltd, Shizuoka-pref., JP;
Abstract
An ultrasonic motor having a stator for generating a vibration therein and a rotor rotatably disposed on the stator is designed so that an electric power for driving the motor is efficiently converted to a rotational force. The rotor is designed so that its resonant frequency becomes equal to a resonant frequency of the stator. Therefore, the resonant vibration in the stator having a peak amplitude is efficiently transferred to the stator which has the same resonant frequency. A plurality of slanted slits for converting a longitudinal vibration into a twisting vibration may be provided on the stator or both of the stator and the rotor. The slanted slits further enhance efficiency of the ultrasonic motor and may be used to selectively rotate the rotor in two directions.