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:
Dec. 25, 1990
Filed:
Feb. 12, 1990
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
An ultrasonic motor is provided with a moving member and a vibrating member which is in contact with the moving member so as to provide the drive input for the moving member. A piezoelectric vibrator is attached to one side of the vibrating member and the opposite side of the vibrating member has a plurality of circumferentially arranged projections. A top section of each projection contacts the moving member. The piezoelectric vibrator will generate a travelling wave on the vibrating member when a proper alternating current electrical power source is applied to the vibrating member. The vibrating member would then be oscillated in a tangential direction, a normal direction, and a radial direction. The oscillations along the tangential direction and the normal direction generate the travelling wave and only the oscillation along the tangential direction is related to the rotational speed of the moving member. The moving member will then rotate faster and provide a greater amount of output energy if the amplitude of the oscillation along the tangential direction is increased. A ratio is established between the width of the contact portion and the width of the vibrating member. When the ratio of the widths is established in a predetermined range, the efficiency of the ultrasonic motor is improved.