Electret capacitor microphone and method for producing the same

Details Electret capacitor microphone and method for producing the same Electret capacitor microphone and method for producing the same

2007-10-30

2007-10-30

Tugbang, A. Dexter (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S594000, C181S158000, C381S191000

Reexamination Certificate

active

10321552

ABSTRACT:
A method for producing an electret capacitor microphone high in sensitivity and stable in acoustic characteristic. A PET film stretched with predetermined tension is bonded to a diaphragm support ring to perform stretch and fixation of a diaphragm to produce a diaphragm sub-assembly. The diaphragm sub-assembly is heated at a predetermined temperature (e.g. 200° C.) higher than a second order transition point of PET. Then, the diaphragm sub-assembly is packed in a housing. Because the diaphragm sub-assembly is heated at the predetermined temperature before packed in the housing, the stiffness of the diaphragm is reduced. Because the stiffness of the diaphragm26is reduced in such a manner, the tension at the time of stretch and fixation of the diaphragm can be set to a large value to prevent the diaphragm from being crinkled.

REFERENCES:
patent: 3247927 (1966-04-01), Cragg
patent: 3337665 (1967-08-01), Underwood et al.
patent: 2000-032596 (2000-01-01), None

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