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:
Jun. 03, 2008
Filed:
May. 31, 2005
Gui Youn Lee, Seoul, KR;
Dong Kyun Lee, Seoul, KR;
Jung Ho Ryu, Kyungki-do, KR;
Byung Woo Kang, Seoul, KR;
Hyoung Jun Jeon, Kyungki-do, KR;
Gui Youn Lee, Seoul, KR;
Dong Kyun Lee, Seoul, KR;
Jung Ho Ryu, Kyungki-do, KR;
Byung Woo Kang, Seoul, KR;
Hyoung Jun Jeon, Kyungki-do, KR;
Samsung Electro-Mechanics Co., Ltd., Kyungki-Do, KR;
Abstract
The present invention provides a piezoelectric ultrasonic motor driver which can perform self-oscillation, adjust the rotational direction of the motor, and be easy to manufacture. The motor includes a metal body having a desired shape; a plurality of piezoelectric plates attached to surfaces of the metal body, contracted and expanded to rotate the metal body; a self-oscillation unit for oscillating at an electromechanical frequency of the piezoelectric plates an electrical signal; and a delay unit for delaying an oscillation signal of the self-oscillation unit in phase by 90 or −90 degrees according to a desired rotational direction.