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What is the piezo-electric type speaker?
What is the piezoelectric type?
It expands and contracts, and it bends if the voltage is applied to a special material Crystal ceramic etc.Such a phenomenon is called and the said material of effect of piezo is called a piezo-electric material.
The speaker unit in the form driven applying the voltage directly to the vibration board of the speaker by using this principle is called a piezo-electric type speaker.
A magnetic circuit and the coil necessary for a dynamic type are unnecessary.
The main commercial item
It is said that the history of the piezo-electric type speaker will go back old to the Roche salt development of the horn (about 1933) only for a small high pitched sound using.
Murata Mfg. announces a globular piezo-electric type speaker in 1996 and the topic is called afterwards though the performance had not arrived at the spread for now one.
