Novel electret microphone

The utility model discloses a novel electret microphone which includes a housing. The inside of the housing is coated with an insulating layer. The housing is of a cylindrical shape. A pole plate is arranged on the insulating layer at the bottom of the housing, a recess is arranged at the center of the pole plate, a metal ring vibration film of a cylindrical shape is arranged on the pole plate, and a cylindrical mouth of the metal ring vibration film is provided with a circuit board. The depth of the recess ranges from 0.02 to 0.05mm, and the diameter of the recess ranges from 2 to 9mm. The novel electret microphone has the advantages that 1) two fittings, namely a plastic ring and a pad, are omitted from manufacture of the microphone, and the cost is reduced; 2) convenience is provided for automatic assembly of automatic equipment; 3) two procedures are omitted, and the labor cost is reduced; and 4) the internal space of the microphone is increased, and a larger and cheaper filed effect transistor can be use