Electret transducing
First Claim
1. A backplate assembly for an electret transducer comprisinga backplate,an electret layer covering one surface of said backplate, anda peripheral spacer on the same side of the backplate as said electret layer and around the entire periphery of said electret layer, said spacer being secured to said backplate by a thin layer of material of said electret layer located and compressed between said spacer and said backplate, said thin layer being substantially thinner than said electret layer.
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Accused Products
Abstract
A backplate assembly for an electret transducer including a backplate, an electret layer covering one surface of the backplate, and a peripheral spacer on the same side of the backplate as the electret layer and around the entire periphery of the electret layer, the spacer being secured to the backplate by a thin layer of material of the electret layer located and compressed between the spacer and the backplate, the thin layer being substantially thinner than the electret layer. Also disclosed is using a peripheral ring to support a diaphragm spaced from a housing wall via support members extending from the ring.
79 Citations
16 Claims
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1. A backplate assembly for an electret transducer comprising
a backplate, an electret layer covering one surface of said backplate, and a peripheral spacer on the same side of the backplate as said electret layer and around the entire periphery of said electret layer, said spacer being secured to said backplate by a thin layer of material of said electret layer located and compressed between said spacer and said backplate, said thin layer being substantially thinner than said electret layer.
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6. A method of making a backplate assembly comprising
providing a sandwich of a backplate, an electret layer covering one surface of said backplate, and a peripheral spacer on the same side of the backplate as said electret and around the entire periphery of said electret layer, and applying sufficient pressure and temperature to cause the majority of electret layer material between said spacer and said backplate to be displaced outward, resulting in a very thin layer between said spacer and said backplate.
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11. A transducer including a backplate assembly comprising
a backplate, an electret layer covering one surface of said backplate, a peripheral spacer on the same side of the backplate as said electret layer and around the entire periphery of said electret layer, said spacer being secured to said backplate by a thin layer of material of said electret layer compressed between said spacer and said backplate, said thin layer being substantially thinner than said electret layer, and a diaphragm spaced from said backplate by said spacer.
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12. An electret transducer comprising
a housing defining an entry port to a chamber therein, a diaphragm in said chamber, and a diaphragm support including a pheripheral ring, one side of said ring being secured to said diaphragm and another side of said ring being secured to support members, said support members spacing said ring from a wall of said housing and providing an unobstructed path between said port and said diaphragm.
Specification