Electro-acoustic transducer, electronic apparatus, electro-acoustic conversion method, and sound wave output method of electronic apparatus

摘要

There are provided a vibration film (21) having a piezoelectric element, a magnetic circuit (20) which generates magnetic force on the basis of a first electric signal and vibrates the vibration film (21) by the magnetic force; and an adjustment unit (31) which generates a second electric signal on the basis of the first electric signal and applies a voltage based on the second electric signal between both surfaces of the piezoelectric element. The amplitude of the entire vibration film (21) is expanded by making the vibration by the magnetic force, which is generated from the magnetic circuit (20), and the vibration, which is generated by application of a voltage to the piezoelectric element, synchronize with each other.

主权项

1. An electro-acoustic transducer comprising:
a vibration film having a piezoelectric element; a magnetic circuit which generates magnetic force on the basis of a first electric signal and vibrates the vibration film by the magnetic force; and an adjustment unit which generates a second electric signal on the basis of the first electric signal and applies a voltage based on the second electric signal between both surfaces of the piezoelectric element, wherein the magnetic circuit includes a pole piece, a yoke and a voice coil, and wherein the voice coil that has an upper end portion fixed to one surface of the vibration film and a lower end portion fits in a space between the pole piece and the yoke.