Title: Piezoelectric actuator drive device, electronic device, drive method thereof, drive control program thereof, and recording medium containing the program
Application Number: 200580001399 Application Date: 2005.03.10
Publication Number: 1898855 Publication Date: 2007.01.17
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02N2/00;G04C3/12;H01L41/09;G04C3/00
Applicant(s) Name: Seiko Epson Corp. Address:
Inventor(s) Name: Kawaguchi Takashi;Sawada Akihiro;Yamazaki Yutaka;O
Attorney & Agent: huang lunwei
Abstract:
    There is provided an electronic device comprising a piezoelectric actuator A and a drive control device (100) for controlling drive of the piezoelectric actuator. The drive control device (100) includes: a drive circuit (111) for supplying a drive signal SDR to a piezoelectric element of an oscillator (12); phase difference detection means (120) for detecting a phase difference representing the oscillation state of the oscillator (12); a comparison voltage setting circuit (133) for correcting a target phase difference serving as a target of the oscillation state; and drive frequency setting means (140) for comparing the phase difference to the target phase difference. By modifying the drive frequency of the drive signal SDR so that the phase difference approaches the target phase difference according to the comparison result, it is possible to realize effective drive of the piezoelectric actuator (A) without depending on the drive voltage.
Time: 6