Electroacoustic transducer

Details Electroacoustic transducer Electroacoustic transducer

2006-03-07

2006-03-07

Ni, Suhan (Department: 2646)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S398000

Reexamination Certificate

active

07010140

ABSTRACT:
A plurality of grooves are radially formed in an annular frame and an annular plate is secured to the frame to form a sound discharge hole in each groove, thereby communicating a back chamber under a diaphragm with the atmosphere. A projected part is outwardly projected from a peripheral edge of the annular plate, and an adhesive is adhered to a peripheral edge of a protector and to an upper surface of the projected part to adhere the protector with the annular plate.

REFERENCES:
patent: 5371428 (1994-12-01), Kikuchi et al.
patent: 6738489 (2004-05-01), Chung et al.
patent: 6751332 (2004-06-01), Kobayashi et al.
patent: 6766034 (2004-07-01), Kobayashi et al.
patent: 6834114 (2004-12-01), Kobayashi et al.
patent: 6845168 (2005-01-01), Kuwabara et al.

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