PIEZOELECTRIC ACTUATOR DRIVER, ELECTRONIC DEVICE, ITS DRIVING METHOD, ITS DRIVING CONTROL PROGRAM, AND RECORDING MEDIUM WHERE THE PROGRAM IS RECORDED

Title:

PIEZOELECTRIC ACTUATOR DRIVER, ELECTRONIC DEVICE, ITS DRIVING METHOD, ITS DRIVING CONTROL PROGRAM, AND RECORDING MEDIUM WHERE THE PROGRAM IS RECORDED

Document Type and Number:

WIPO Patent Application WO/2005/088823

Kind Code:

A1

Abstract:

When the decreasing rate of the power source voltage is higher than a reference decreasing rate, namely, when the drive efficiency is low and a piezoelectric actuator is driven at a drive frequency at which the power consumption is large, or when the piezoelectric actuator (A) cannot be started because of a some cause, a control circuit (131) returns the drive frequency to a predetermined drive frequency and again performs drive frequency change. Therefore, the time until the start failure is detected is not long, and the start failure can be instantly judged from the decreasing rate of the power source voltage. Since the time required for this judgment is shortened, the processing from the abnormality detection till the optimization of the drive signal can be quickly carried out, and the power consumption is reduced to realize power saving.

Inventors:

YAMAZAKI YUTAKA
KAWAGUCHI TAKASHI

Application Number:

PCT/JP2005/004768

Publication Date:

September 22, 2005

Filing Date:

March 17, 2005

Export Citation:

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Assignee:

SEIKO EPSON CORP (JP)

International Classes:

B06B1/06; G04C3/00; G04C3/12; H01L41/04; H02N2/00; H01L41/09; (IPC1-7): H02N2/00; B06B1/06; G04C3/00; G04C3/12

Foreign References:

JPH05184171A

1993-07-23

Other References: