DRIVE CIRCUIT, DEVICE FOR CONVERTING ELECTRIC SIGNAL TO MECHANICAL SOUND DEVICE AND PORTABLE TERMINAL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide the subject conversion device which generates a stable and highly efficient oscillating output. SOLUTION: The drive circuit drives an oscillator having a machine oscillation system which resonates at a resonant frequency, and outputs at least two signals having frequencies involved in a specific frequency region including the resonant frequency.