Driving apparatus, vibration generating apparatus, electronic apparatus, and driving method

Patent metadata

Field	Value
Publication number	US-11633761-B2
Application number	US-202016952506-A
Country	US
Kind code	B2
Filing date	Nov 19, 2020
Priority date	Nov 28, 2019
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

Provided is a driving apparatus that sets a signal wave in a low-frequency region having a frequency of 10 Hz or more and 250 Hz or less as a modulating wave and outputs to a piezoelectric actuator a driving signal having a waveform obtained by modulating an amplitude of a sine wave in a high-frequency region having a frequency of 20 kHz or more and 40 kHz or less with the modulating wave.

First claim

What is claimed is:

1. A vibration generating apparatus comprising:
a vibrating member;
a piezoelectric actuator bonded to the vibrating member; and
a driving apparatus that sets a signal wave in a low-frequency region having a frequency of 10 Hz or more and 250 Hz or less as a modulating wave and outputs to the piezoelectric actuator a driving signal having a waveform obtained by modulating an amplitude of a sine wave in a high-frequency region having a frequency of 20 kHz or more and 40 kHz or less with the modulating wave, thereby causing the vibrating member to vibrate via the piezoelectric actuator driven by the driving signal.

2. The vibration generating apparatus according to claim 1 , wherein:
the sine wave is set to have voltage gain of −10 dB or more and 0 dB or less and
the modulating wave is set to have voltage gain of −6 dB or more and 0 dB or less.

3. The vibration generating apparatus according to claim 2 , wherein:
the sine wave is set to have voltage gain of −10 dB, and
the modulating wave is set to have voltage gain of 0 dB.

4. An electronic apparatus comprising:
the vibration generating apparatus as set forth in claim 1 ; and
an electronic component connected to the vibration generating apparatus.

Assignees

• Taiyo Yuden Kk

Inventors

• Ishii Shigeo
• Goto Takayuki
• Kishimoto Sumiaki
• Shimizu Hiroyuki
• Namikawa Yuichi

Classifications

• B06B1/0238 Primary

  of a single frequency, e.g. a sine-wave · CPC title

• H02N2/001 Primary

  Driving devices, e.g. vibrators · CPC title

• B06B2201/55

  Piezoelectric transducer · CPC title

• B06B1/0276 Primary

  with simultaneous generation, e.g. with modulation, harmonics · CPC title

• H02N2/008

  Means for controlling vibration frequency or phase, e.g. for resonance tracking · CPC title