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:
Apr. 16, 1996
Filed:
Dec. 16, 1994
Nikon Corporation, Tokyo, JP;
Abstract
An ultrasonic motor having a stator and a mobile element made of improved materials. The ultrasonic motor includes an electro-mechanical conversion element, a stator and a mobile element. The electro-mechanical conversion element creates oscillations when an electrical signal is applied to the electro-mechanical conversion element. The stator is joined to the electro-mechanical conversion element and includes a stator contact part. The mobile element includes a mobile element contact part in contact with the stator contact part. When an electrical signal is applied to the electro-mechanical conversion element, the electro-mechanical conversion element creates oscillations in the stator contact part to drive the mobile element. Either the stator contact part and/or the mobile element contact part is made of a plastic material which has a polyacetol resin as a major component. The plastic material can include a polyolefin resin. Moreover, the plastic material can additionally include at least one of titanium oxide, silica, molybdenum disulfide or carbon powder. By properly selecting the material of the stator contact part and/or the mobile element contact part, the drive efficiency, anti-abrasive characteristics and chemical stability of the ultrasonic motor are improved.