CPC A61M 11/005 (2013.01) [B05B 17/0623 (2013.01); B06B 1/0284 (2013.01); B06B 1/06 (2013.01); B06B 3/00 (2013.01); B06B 2201/76 (2013.01); B06B 2201/77 (2013.01)] | 7 Claims |
1. An ultrasonic vibrator driving apparatus that operates by applying an alternating voltage as a drive voltage to an ultrasonic vibrator that includes a piezoelectric element and has a unique resonance frequency, the ultrasonic vibrator driving apparatus comprising:
a drive voltage generator to generate the drive voltage with a variable frequency in a frequency range including the resonance frequency of the ultrasonic vibrator; and
a sweep controller to repeatedly sweep the frequency of the drive voltage with a predetermined sweep width and a predetermined sweep period so as to include the resonance frequency, based on a reference frequency set according to the resonance frequency of the ultrasonic vibrator, and to associate and restrict the sweep period and the sweep width such that the sweep period and the sweep width fall within a predetermined allowed region on a two-dimensional map divided by the sweep period and the sweep width.
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