Multi-mode microphones

• US 9,479,875 B2
• Filed: 01/23/2015
• Issued: 10/25/2016
• Est. Priority Date: 01/23/2015
• Status: Active Grant

• Current Assignee: Silicon Audio Directional, LLC
• Original Assignee: Silicon Audio Directional, LLC
• Inventors: Hall, Neal A., Kim, Donghwan
• Primary Examiner(s): Ni, Suhan
• Application Number:
  US14/604,522
• Publication Number:
  US 20160219378A1
• Time in Patent Office: 641 Days
• Field of Search: 381/172, 381/173, 381/182, 381/190, 381/369
• US Class Current: 1/1
• CPC Class Codes: H04R 17/02 Microphones
• CPC Class Codes: H04R 19/005 using semiconductor materials
• CPC Class Codes: H04R 19/04 Microphones H04R19/01 takes precedence
• CPC Class Codes: H04R 2201/003 Mems transducers or their use of the electrostatic type H04R19/005
• CPC Class Codes: H04R 23/02 Transducers using more than one principle simultaneously

Abstract

In some embodiments, a sensor system may include a deformable structure and a sensing element. The deformable structure may include at least one layer of piezoelectric material and at least one actuator port disposed on the at least one layer of piezoelectric material. The deformable structure may deform in response to external phenomenon. The at least one actuator port may be configured to actuate the at least one layer of piezoelectric material via application of an electrical signal to the at least one layer of piezoelectric material. The at least one layer of piezoelectric material may be configured to apply a force to the deformable structure when actuated. The sensing element may be configured to sense deformation of the deformable structure capacitively, optically, or via a sensing port according to embodiments.

Claims

1. A sensor system, comprising:

a deformable structure, wherein the deformable structure is subject to deformation in response to external phenomenon, wherein the deformable structure comprises;

at least one layer of piezoelectric material; and

at least one actuator port disposed on the at least one layer of piezoelectric material, wherein the at least one actuator port is configured to actuate the at least one layer of piezoelectric material via application of an electrical signal to the at least one layer of piezoelectric material, wherein the at least one layer of piezoelectric material is configured to generate a force responsive to the electrical signal;

at least one sensing port, wherein the at least one sensing port is in contact with a region of the deformable structure, and wherein the at least one sensing port is configured to;

sense a deformation of the region of the deformable structure; and

generate a signal in response to the deformation; and

a sensing element, wherein the sensing element is configured to detect deformation of the deformable structure via the signal generated by the at least one sensing port.

2. The sensor system of claim 1, wherein the region is comprised in the at least one layer of piezoelectric material, and wherein the at least one sensing port is disposed on the at least one layer of piezoelectric material.

3. The sensor system of claim 1, wherein the deformable structure further comprises at least one additional layer of piezoelectric material, wherein the region is comprised in the at least one additional layer of piezoelectric material, and wherein the at least one sensing port is disposed on the at least one additional layer of piezoelectric material.

4. The sensor system of claim 1, wherein the at least one sensing port comprises an electrode pair.

5. The sensor system of claim 4, wherein the electrode pair is coupled to:

the at least one layer of piezoelectric material;

or

at least one additional layer of piezoelectric material comprised in the deformable structure.

6. The sensor system of claim 4, wherein the electrode pair is coupled to a piezoelectric layer disposed on the deformable structure.

7. The sensor system of claim 1, wherein the at least one sensing port comprises a pair of parallel plate electrodes.

8. The sensor system of claim 1, wherein the sensing element comprises an integrated circuit.

9. The sensor system of claim 8, wherein the integrated circuit is comprised in a silicon chip or a substrate.

10. The sensor system of claim 1, wherein the sensing element is electrically coupled to the at least one actuator port and the at least one sensing port.

11. The sensor system of claim 1, wherein the electrical signal applied to the at least one layer of piezoelectric material is based on the signal generated by the at least one sensing port.

12. The sensor system of claim 1, wherein the deformable structure further comprises:

a deformable element, wherein the at least one layer of piezoelectric material is disposed on the deformable element.

13. The sensor system of claim 1, wherein the deformable structure further comprises:

at least one additional layer of piezoelectric material; and

at least one additional actuator port disposed on the at least one additional layer of piezoelectric material, wherein the at least one additional actuator port is configured to actuate the at least one additional layer of piezoelectric material via application of an additional electrical signal to the at least one additional layer of piezoelectric material, wherein the at least one additional layer of piezoelectric material is configured to generate a force responsive to the additional electrical signal.

14. The sensor system of claim 1, wherein the deformable structure is approximately circular in shape, and wherein the at least one actuator port is patterned in a shape of a single annular ring.

15. The sensor system of claim 1, wherein the deformable structure further comprises a plurality of actuator ports, wherein each of the plurality of actuator ports comprises an electrode pair.

16. The sensor system of claim 15, wherein the plurality of actuator ports is configured to deform the deformable structure via application of electrical signals to the at least one piezoelectric layer.

17. The sensor system of claim 15, wherein the deformable structure is approximately circular in shape, and wherein the plurality of actuator ports is patterned in a shape of two annular rings.

18. The sensor system of claim 1, wherein the at least one actuator port comprises at least one pair of parallel plate electrodes, and wherein the at least one layer of piezoelectric material is actuated via the at least one pair of parallel plate electrodes.

19. The sensor system of claim 1, wherein the at least one actuator port comprises at least one pair of interdigitated electrodes, and wherein the at least one layer of piezoelectric material is actuated via the at least one pair of interdigitated electrodes.

20. The sensor system of claim 1, wherein the external phenomenon is an external acoustic pressure or an acceleration.

21. A multi-mode microphone system, comprising:

a substrate;

a multi-mode microphone coupled to the substrate, wherein the multi-mode microphone comprises;

a deformable structure, comprising;

at least one layer of piezoelectric material; and

at least one actuator port disposed on the at least one layer of piezoelectric material, wherein the at least one actuator port is configured to actuate the at least one layer of piezoelectric material via application of an electrical signal to the at least one layer of piezoelectric material, wherein the at least one layer of piezoelectric material is configured to generate a force responsive to the electrical signal; and

at least one sensing port, wherein the at least one sensing port is in contact with a region of the deformable structure, and wherein the at least one sensing port is configured to;

sense a deformation of the region of the deformable structure; and

generate a signal in response to the deformation; and

a processing element, electrically coupled to the substrate and multi-mode microphone, wherein the processing element is configured to;

sense deformation of the deformable structure via the signal generated by the at least one sensing port; and

transmit the electrical signal to the at least one actuator port.

22. The multi-mode microphone system of claim 21, wherein the region is comprised in the at least one layer of piezoelectric material, and wherein the at least one sensing port is disposed on the at least one layer of piezoelectric material.

23. The multi-mode microphone system of claim 21, wherein the deformable structure further comprises at least one additional layer of piezoelectric material, wherein the region is comprised in the at least one additional layer of piezoelectric material, and wherein the at least one sensing port is disposed on the at least one additional layer of piezoelectric material.

24. The multi-mode microphone system of claim 21, wherein the at least one sensing port comprises an electrode pair.

25. The multi-mode microphone system of claim 24, wherein the electrode pair is coupled to:

the at least one layer of piezoelectric material;

or

at least one additional layer of piezoelectric material comprised in the deformable structure.

26. The multi-mode microphone system of claim 24, wherein the electrode pair is coupled to a piezoelectric layer disposed on the deformable structure.

27. The multi-mode microphone system of claim 21, wherein the at least one sensing port comprises a pair of parallel plate electrodes.

28. The multi-mode microphone system of claim 21, wherein the transmitted electrical signal is based on the signal generated by the at least one sensing port.

29. A method comprising:

a processing element performing,

sensing deformation of a deformable structure via a signal generated by at least one sensing port, wherein the at least one sensing port is in contact with a region of the deformable structure, wherein the at least one sensing port is configured to generate a signal in response to the deformation, wherein the deformable structure comprises at least one layer of piezoelectric material and at least one actuator port disposed on the at least one layer of piezoelectric material, wherein the at least one actuator port is configured to actuate the at least one layer of piezoelectric material via application of an electrical signal to the at least one layer of piezoelectric material, wherein the at least one layer of piezoelectric material is configured to generate a force responsive to the electrical signal; and

transmit the electrical signal to the at least one actuator port.