Electret transducer with tapered acoustic chamber
First Claim
1. A electret transducer comprisinga backplate coated on one face with a dielectric material,a diaphragm spaced apart from and positioned parallel to said backplate and facing said one face,a frame for carrying said backplate and said diaphragm, andmeans for defining an acoustic chamber, said means including said diaphragm and a member having an inner surface spaced from and opposing said diaphragm, said chamber having an opening thereto located at a chamber boundary non-parallel with said diaphragm and located near one side edge of said diaphragm, the height of said chamber defined by said inner surface and said diaphragm diminshing substantially continuously from near said opening to zero height at an opposite side of said diaphragm, the average width of said inner surface increasing substantially continuously from near said opening to said opposite side.
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Accused Products
Abstract
An electret transducer wherein a backplate is mounted between inwardly disposed surfaces of a ridge protruding from a face of a frame, a diaphragm is mounted on the ridge, and an acoustic chamber, which is partially defined by the diaphragm, diminishes in size as it becomes more remote from an opening to it.
29 Citations
1 Claim
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1. A electret transducer comprising
a backplate coated on one face with a dielectric material, a diaphragm spaced apart from and positioned parallel to said backplate and facing said one face, a frame for carrying said backplate and said diaphragm, and means for defining an acoustic chamber, said means including said diaphragm and a member having an inner surface spaced from and opposing said diaphragm, said chamber having an opening thereto located at a chamber boundary non-parallel with said diaphragm and located near one side edge of said diaphragm, the height of said chamber defined by said inner surface and said diaphragm diminshing substantially continuously from near said opening to zero height at an opposite side of said diaphragm, the average width of said inner surface increasing substantially continuously from near said opening to said opposite side.
Specification
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Current AssigneeRTI Technologies PTE Ltd. (Intricon Corporation)
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Original AssigneeLectret S. A.
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InventorsHubschi, Kurt, Murphy, Preston V.
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Primary Examiner(s)Stellar, George G.
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Application NumberUS06/123,718Time in Patent Office823 DaysField of Search179/111 R, 179/111 EUS Class Current381/345CPC Class CodesH04R 1/22 for obtaining desired frequ...H04R 19/01 characterised by the use of...H04R 19/016 for microphonesH04R 25/604 of acoustic or vibrational ...
