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. 08, 1991
Filed:
Jul. 03, 1989
Masaki Yamaguchi, Gifu, JP;
Brother Kogyo Kabushiki Kaisha, Aichi, JP;
Abstract
A vibrator for exciting substantially elliptical motion and an ultrasonic motor employing such a vibrator. A vibrator includes a resonant member having a central hole defined therein and a circumferential portion, a first piezoelectric member for exciting circumferential shearing vibration in the resonant member such that the circumferential portion and the hole are positioned at antinodes of the circumferential shearing vibration about the hole, and a second piezoelectric member for exciting vertical vibration or flexural vibration in the resonant member in a direction different from the direction in which the circumferential shearing vibration is excited by the first piezoelectric member. An ultrasonic vibrator has a moving element held against the resonant member in the vibrator.