Electromagnetic electroacoustic transducer

Details Electromagnetic electroacoustic transducer Electromagnetic electroacoustic transducer

2005-06-21

2005-06-21

Martin, Edgardo San (Department: 2837)

Acoustics

Diaphragm and enclosure

C181S160000, C181S156000, C181S199000, C381S349000, C381S351000

Reexamination Certificate

active

06907955

ABSTRACT:
An electromagnetic electroacoustic transducer, includes: a diaphragm; a magnet; an electromagnetic coil; and a casing for storing the diaphragm, the magnet and the electromagnetic coil therein. The case has at least one first sound emitting hole through which a front space on a front surface of the diaphragm in the casing communicates with a front outer space in front of the casing and at least one second sound emitting hole through which a rear space on a rear surface of the diaphragm in the casing communicates with the front outer space in front of the casing. A resonant frequency Fv2of the rear space is set at a value in the range: F0<Fv2≦Fv1in which F0is a resonant frequency of the diaphragm, and Fv1is a resonant frequency of the front space.

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