CAPACITOR TYPE SOUNDER UNIT AND EARPHONE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a capacitor type sounder unit which is small and can be realized at low cost.

SOLUTION: A capacitor type sounder unit 100 comprises: a plate electrode 1 made of a conductor; a diaphragm 3 disposed to face the plate electrode 1 via a spacer 2 for insulation from the plate electrode 1; a casing 10 which houses the plate electrode 1 and the diaphragm 3 and has a sound hole 10A bored therein at a position facing the diaphragm 3; and a pair of signal input terminals 6 electrically interconnected with the respective plate electrode 1 and diaphragm 3. The casing 10 houses the plate electrode 1 and the diaphragm 3 such that the plate electrode 1 and the diaphragm 3 are inserted and held between the holder 4A made of insulation material and the diaphragm ring 4B made of conductive material of an insert-holding part 4 from both sides in the direction that the plate electrode 1 and the diaphragm 3 face each other, and such that the diaphragm 3 is fixed to the diaphragm ring 4B.

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