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:
Aug. 20, 2002
Filed:
Aug. 22, 1997
Daisuke Saya, Urayasu, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An apparatus and method for driving an ultrasonic motor to reduce the rise response time. The ultrasonic motor is drivable at different frequencies and has a desired target speed, each frequency corresponding to a respective speed and a respective torque. The ultrasonic motor enters a specific mode after being started and driven. When the ultrasonic motor is started, a drive control unit drives the ultrasonic motor at a frequency corresponding to approximately a maximum torque. When the ultrasonic motor enters the specific mode, the drive control unit drives the ultrasonic motor at a frequency corresponding to approximately the target speed. Alternatively, the ultrasonic motor can be driven at different drive voltages, each drive voltage having corresponding frequencies, with each frequency of each drive voltage corresponding to a respective speed and a respective torque. The ultrasonic motor enters a specific mode after being started and driven. When the ultrasonic motor is started, the drive control unit selects a drive voltage, and drives the ultrasonic motor at the selected drive voltage and at a frequency of the selected drive voltage which corresponds to a maximum torque. When the ultrasonic motor enters the specific mode, the drive control unit selects a different drive voltage, and drives the ultrasonic motor at the selected, different drive voltage and at a frequency of the selected, different drive voltage which corresponds to approximately the target speed.