Micromachined Capacitive Microphone
First Claim
1. A micromachined capacitive microphone including a shallowly corrugated diaphragm having a plurality of support dimples connected to the diaphragm is anchored at one or more locations on the support;
- a remaining diaphragm layer that is loose at other locations is bounded at perimeters by edge rail and tap for lateral and vertical movements and forms a passage at these locations with the tap on edge rail;
a perforated backplate having perforation holes and through holes is spaced in parallel below the diaphragm; and
the said diaphragm, the said support and the said backplate form a cantilever structure that is shaped to release and control the stress in the said diaphragm.
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Accused Products
Abstract
This invention relates to a micromachined capacitive microphone having a shallowly corrugated diaphragm that is anchored at one or more locations on the support has a plurality of dimples to support itself and rest freely on the perforated backplate. The diaphragm whose ends are not anchored is bounded by the taps of edge rail. Also disclosed includes: a fixed perforated backplate having one or more regions; an adjustable cantilever formed by the diaphragm, the support and the backplate; a plurality of dimples maintaining vertical separation between diaphragm and backplate; and the patterning of conductor electrodes carried by diaphragm and backplate.
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Citations
22 Claims
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1. A micromachined capacitive microphone including
a shallowly corrugated diaphragm having a plurality of support dimples connected to the diaphragm is anchored at one or more locations on the support; -
a remaining diaphragm layer that is loose at other locations is bounded at perimeters by edge rail and tap for lateral and vertical movements and forms a passage at these locations with the tap on edge rail;
a perforated backplate having perforation holes and through holes is spaced in parallel below the diaphragm; and
the said diaphragm, the said support and the said backplate form a cantilever structure that is shaped to release and control the stress in the said diaphragm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 13, 20)
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8. A micromachined capacitive microphone including
a shallowly corrugated diaphragm having a plurality of support dimples connected to the diaphragm is anchored at one or more locations on the support; -
a remaining diaphragm layer that is loose at other locations is bounded at perimeters by edge rail and tap for lateral and vertical movements and forms a passage at these locations with the tap on edge rail;
a perforated backplate having perforation holes and through holes is spaced in parallel below the diaphragm; and
the said diaphragm, the said tap on edge rail, and the said perforated backplate having pre-defined through holes forms a low-pass filter for passage of slow varying ambient pressure. - View Dependent Claims (9, 10, 11, 12, 14)
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15. A micromachined capacitive microphone including
a shallowly corrugated diaphragm having a plurality of support dimples connected to the diaphragm is anchored at one or more locations on the support; -
a remaining diaphragm layer that is loose at other locations is bounded at perimeters by edge rail and tap for lateral and vertical movements and forms a passage at these locations with the tap on edge rail;
a perforated backplate having perforation holes and through holes is spaced in parallel below the diaphragm;
the said diaphragm having electrode patterning is made of non-conductive material, and a composite of conductive and non-conductive layers; and
the said backplate having electrode patterning when the said backplate has a conductive region and a non-conductive region. - View Dependent Claims (16, 17, 18, 19, 21, 22)
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Specification