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:
Sep. 24, 2002
Filed:
Apr. 14, 1999
Norbert Dettmann, Herzogenrath, DE;
Gerhard Diefenbach, Aachen, DE;
Franz-Josef Küppers, Würselen, DE;
Christian Reichinger, Alsdorf, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The invention relates to a motor having a cuboid piezoelectric element ( ) which carries an actuating member ( ) for transmitting a force in an actuating direction (x). In known motors the piezoelectric element ( ) is restrained by four restraining elements which are disposed in the plane of vibration (x/y plane) and which exert a preloading force on the piezoelectric element ( ) in a direction perpendicular to the actuating direction (x). However, this gives rise to a frictional force between the restraining elements and the piezoelectric element, which reduces the vibration quality and, as a consequence, the motor power. This is avoided by means of the invention, where the piezoelectric element ( ) is restrained by means of restraining elements ( ) without preloading, i.e. with maximal slidability in the directions (y, z) perpendicular to the actuating direction (x). Preferably, such a motor is used in drive apparatuses, particularly for driving the read/write unit on a pivotable arm or on a translatable slide.