| 摘要 |
PROBLEM TO BE SOLVED: To provide the output sound pressure of a vibration actuator which consists of a vibratable magnetic circuit including a permanent magnet and a yoke and a coil integrate with a vibrator as main constitution elements and is capable of outputting both of vibration and voice. SOLUTION: A composite of a magnetic metal or magnetic material and low-resistance metal is used as an electric wire constituting a coil, by which the magnetic flux of the gap of the magnetic circuit is converged toward the coil and the Lorentz's force received by the coil is increased. The sound pressure outputted by the vibration actuator is increased by more largely vibrating the vibrator.
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