Acoustic transducer

Details Acoustic transducer Acoustic transducer

1998-03-26

2000-03-07

Tran, Sinh

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

381431, 381412, 381420, H04R 2500

Patent

active

060350520

ABSTRACT:
An electromagnetic induction type acoustic transducer including a plate as an assembly of a magnetic circuit and having an opening of a predetermined diameter about a central axis, a pole piece as an assembly of the magnetic circuit and protruded on the central axis, having an outer peripheral diameter smaller than the opening of the plate and having an upper surface located lower than a lower surface of an opening peripheral portion of the plate by a predetermined distance, a lower surface portion of the opening peripheral portion of the plate and an upper surface portion of the pole piece constitute a magnetic gap of the magnetic circuit,

REFERENCES:
patent: 4243839 (1981-01-01), Takahashi et al.
patent: 5255328 (1993-10-01), Akiniwa et al.
patent: 5467323 (1995-11-01), Sone
patent: 5487114 (1996-01-01), Dinh
patent: 5673330 (1997-09-01), Chang
patent: 5832096 (1998-11-01), Hall

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