The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 30, 2007
Filed:
Dec. 18, 2002
Motoaki Ito, Shizuoka, JP;
Kentaro Yonehara, Shizuoka, JP;
Motoaki Ito, Shizuoka, JP;
Kentaro Yonehara, Shizuoka, JP;
Star Micronics Co., Ltd., Shizuoka, JP;
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 diaphragmis 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.