Microphone with internal damping
First Claim
Patent Images
1. A microphone, comprising:
- a housing;
a diaphragm mounted in said housing;
a backplate mounted substantially parallel to and spaced apart from said diaphragm, said backplate having at least one hole through said backplate; and
a cover contacting a surface portion of said backplate to cover up said at least one hole in said backplate, said cover having at least one opening through said cover, said at least one opening having a predetermined size, shape, and/or location to control a frequency response of said microphone, said at least one opening being smaller than said at least one hole, said cover having a footprint that is less than a footprint of said backplate, wherein said cover includes a clip portion extending away from said backplate at an angle, said clip portion providing a spring-load for said cover.
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Abstract
Method and apparatus are disclosed for damping the resonance frequency in a microphone. The method and apparatus of the invention involve providing an elastomeric frame to support the backplate. The elastomeric frame forms a substantially air tight seal around the backplate. A hole is formed in the backplate and a cover having an opening therein is placed over the hole in the backplate. The frequency response of the microphone may then be controlled by precisely controlling the size, shape, and/or location of the opening in the cover overlaying the hole. The cover may also serve as an electrical contact to other components in the microphone.
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Citations
21 Claims
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1. A microphone, comprising:
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a housing; a diaphragm mounted in said housing; a backplate mounted substantially parallel to and spaced apart from said diaphragm, said backplate having at least one hole through said backplate; and a cover contacting a surface portion of said backplate to cover up said at least one hole in said backplate, said cover having at least one opening through said cover, said at least one opening having a predetermined size, shape, and/or location to control a frequency response of said microphone, said at least one opening being smaller than said at least one hole, said cover having a footprint that is less than a footprint of said backplate, wherein said cover includes a clip portion extending away from said backplate at an angle, said clip portion providing a spring-load for said cover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A microphone, comprising:
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a housing; a diaphragm mounted in said housing; a backplate mounted in said housing at a known location relative to said diaphragm, said backplate having a hole through said backplate; an electrical-contact element contacting a surface portion of said backplate for carrying signals from said backplate, said electrical-contact element providing an opening having a predetermined size, shape, and/or location in said electrical-contact element for controlling a frequency response of said microphone, said opening being smaller than said hole, wherein said electrical-contact element includes a clip portion extending away from said backplate at an angle, said clip portion providing a spring-load for said electrical-contact element and an electrical connection between said backplate and other components in said microphone, and wherein said electrical-contact element has a footprint that is less than a footprint of said backplate. - View Dependent Claims (19, 20, 21)
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Specification