Microphone

Details Microphone Microphone

1989-08-04

1992-11-03

Isen, Forester W.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Microphone capsule only

381190, 381191, 310324, H04R 2500

Patent

active

051612003

ABSTRACT:
The present invention is directed to a microphone in which all elements having mass which can affect the output of the microphone have a resonant frequency outside the frequency range of interest. The present invention utilizes a relatively stiff diaphragm having low density, which is at the same time thin. The diaphragm is designed to have a resonant frequency outside the range of interest. The diaphragm and the sensor are a single assembly in the preferred embodiment of the present invention. The assembly comprises a diaphragm made of a ceramic material having the properties of stiffness and low density. The sensor is a piezo electric disk coupled to the diaphragm. The sensor/diaphragm assembly is mounted in a housing so as to have a reference air space behind the assembly. The sensor is metallized to provide electrical conductivity. The reference air space is kept separate from the atmosphere and the resonant frequency of the assembly and air space is higher than the selected frequency range.

REFERENCES:
patent: 2614144 (1952-10-01), Howatt
patent: 3403234 (1968-09-01), Barnes, Jr.
patent: 3736632 (1973-06-01), Barrow
patent: 3943388 (1976-03-01), Massa
patent: 4291781 (1981-09-01), Niguchi et al.
patent: 4726443 (1988-02-01), Ugaji et al.
patent: 4843275 (1989-06-01), Radice
patent: 4906840 (1990-03-01), Zdeblick et al.

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