DRIVER CIRCUIT FOR VIBRATING TYPE DRIVING DEVICE AND VIBRATING TYPE ACTUATOR DEVICE

Japanese Patent JP3658120

B2

PROBLEM TO BE SOLVED: To convert a current into mechanical vibrations efficiently by setting the resonance frequency of the admittance characteristics of the whole vibrator, so that the admittance ratio of the mechanical-arm component of the equivalent circuit for the vibrator to an electric-arm component exists in a frequency band shown in specific formula.
SOLUTION: One of outputs from a high-frequency oscillator 11 is connected to an electrode 123a for a piezoelectric element constituting an oscillatory-wave motor 120 through an amplifier 14 and an inductance element 16a, and the other outputs is changed into AC voltage having different phase at 90° by a 90° phase shifter 12, and joined with an electrode 123b for the piezoelectric element through an amplifier 13 and an inductance element. The resonance frequency of the admittance characteristics of the whole vibrator containing the inductance element is set at an inductance value L, where the ratio of the magnitude of the admittance Ye of a mechanical-arm component in an equivalent circuit for a vibrator to the magnitude of the admittance Ym of an electric-arm component exists in a frequency band satisfying &verbar Ye&verbar /&verbar Ym&verbar <=1 at that time.

JP2007228610	ACOUSTIC VIBRATION GENERATING ELEMENT
WO/2009/031290	ACOUSTIC WAVE DEVICE

Hironobu Takano

JP35050496A

June 08, 2005

December 27, 1996

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Canon Inc

B06B1/06; H02N2/00; (IPC1-7): H02N2/00; B06B1/06

JP8107687A
JP62002869A
JP7115785A
JP7231683A

Masayuki Kishida
Honda Kodaira

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