Koninklijke Philips Corporation N.V.

Forschungszentrum Julich Gmbh

Norbert Dettmann

Christian Reichinger

Gerhard Diefenbach

Helmut Soltner

Franz-Josef K&uuml;ppers

Harald Glückler

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.

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Herzogenrath, Germany

Norbert Dettmann