MEMS microphone
First Claim
Patent Images
1. A microphone comprising:
- a first diaphragm that is passive and thus not responsive to an electrical signal;
a driver to generate a signal in response to displacement of the first diaphragm; and
a second diaphragm coupled to the first diaphragm by a closed air volume, the second diaphragm being active and being movable in response to the signal generated by the driver;
wherein the first diaphragm and the second diaphragm each comprises a piezoelectric diaphragm.
2 Assignments
0 Petitions
Accused Products
Abstract
A microphone includes a first diaphragm and a second diaphragm coupled to the first diaphragm by a closed air volume. The first diaphragm and the second diaphragm each constitutes a piezoelectric diaphragm. The first diaphragm and the second diaphragm are electrically coupled so that movement of the first diaphragm causes movement of the second diaphragm.
244 Citations
23 Claims
-
1. A microphone comprising:
-
a first diaphragm that is passive and thus not responsive to an electrical signal; a driver to generate a signal in response to displacement of the first diaphragm; and a second diaphragm coupled to the first diaphragm by a closed air volume, the second diaphragm being active and being movable in response to the signal generated by the driver; wherein the first diaphragm and the second diaphragm each comprises a piezoelectric diaphragm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A microphone comprising:
-
a first diaphragm coupled to a closed air volume, the first diaphragm being passive and thus movable in response to pressure but not responsive to an electrical signal; a second diaphragm being active and thus movable in response to a control signal, the second diaphragm being movable in response to the control signal to dampen an oscillation amplitude of the first diaphragm; and a driver to generate the control signal in response to movement of the first diaphragm. - View Dependent Claims (9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
14. The microphone of 8, wherein the second diaphragm is coupled to the closed air volume;
- and
wherein the first and second diaphragms are arranged along a same wall that is part of a structure that houses the closed air volume.
- and
Specification