Drive unit

Details Drive unit Drive unit

2006-08-11

2008-11-25

San Martin, J. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S328000

Reexamination Certificate

active

07456546

ABSTRACT:
A drive unit being characterized in that a movable object can be prevented from being tilted when the movable object is stopped using a restricting member. The drive unit comprises a piezoelectric element; a rod provided at an end of the piezoelectric element; a movable object, which is frictionally engaged with the rod and the movable range of which is restricted using the restricting members; and drive pulse generating means for applying drive signals to the piezoelectric element, wherein the drive pulse generating means apply a first wave drive signal for vibrating the rod so that the movable object moves toward the restricting member when the movable object is moved to a position where the movable object is close to the restricting member, and temporarily apply a second wave drive signal for vibrating the rod so that the movable object is moved in a direction of movement away from the restricting member after the movable object is made contact with the restricting member, and then stop the application of the drive signal.

REFERENCES:
patent: 5786654 (1998-07-01), Yoshida et al.
patent: 6016231 (2000-01-01), Kanbara et al.
patent: 6433459 (2002-08-01), Okada
patent: 2005/0242685 (2005-11-01), Yuasa
patent: 2005/0275315 (2005-12-01), Manabe et al.
patent: 11-98865 (1999-04-01), None

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