Directional capacitor microphone system
AssigneeLucent Technologies Inc.
InventorsRobert Alfred Kubli, Gabriel Lorimer Miller, Eric Richard Wagner
Life of this patent
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Abstract
In a capacitor microphone system for directional applications, an array of backplates of microphone cells are formed on a printed circuit (PC) board. A continuous strip of diaphragm is employed to cover each backplate. The diaphragm is stretched to create a uniform tension along its length, contributing to the objective of achieving a uniform gain by each microphone cell. In addition, the diaphragm is separated from the backplates by a relatively large distance such that the percentage deviation from such a distance from cell to cell is relatively small, again contributing to the objective of gain uniformity.
Claims25
A system including a plurality of microphone cells comprising:
- a plurality of backplates, each backplate being associated with a respective one of said microphone cells;
- and
- a diaphragm for covering said plurality of backplates to constitute said microphone cells, said diaphragm having a surface thereof facing said plurality of backplates to form an electrical relation to said backplates.
A microphone system for sensing incident sound comprising:
- a plurality of backplates;
- a diaphragm for covering said backplates to form microphone cells, each microphone cell being associated with a respective one of said backplates, said diaphragm having a surface thereof facing said plurality of backplates to form an electrical relation to said backplates, said diaphragm moving in response to said incident sound;
- and
- a spacer for separating said diaphragm from said backplates by a selected distance, said selected distance being relatively large such that a percentage deviation from said selected distance from a microphone cell to another microphone cell in the system is relatively small.
Dependencies are inferred from the claim text.