High-speed acrylic electroactive polymer transducers

• US 20070200457A1
• Filed: 02/24/2006
• Published: 08/30/2007
• Est. Priority Date: 02/24/2006
• Status: Abandoned Application

• Current Assignee: Bayer Materialscience AG (Covestro AG), SRI International, Inc.
• Original Assignee: Bayer Materialscience AG (Covestro AG)
• Inventors: Heim, Jonathan, Pelrine, Ronald, Kornbluh, Roy, Smith, Jonathan
• Application Number:
  US11/361,703
• Publication Number:
  US 20070200457A1
• Time in Patent Office: Days
• US Class Current: 310/324
• CPC Class Codes: H02N 2/046 for conversion into rotary motion
• CPC Class Codes: H10N 30/206 using only longitudinal or thickness displacement, e.g. d33 or d31 type devices
• CPC Class Codes: H10N 30/857 Macromolecular compositions

Abstract

Devices employing electroactive polymer actuators are disclosed. Acrylic dielectric material based actuators are optionally provided in which architectures are presented that allow for improved power output as compared with other known acrylic dielectric material based transducers. Such technology may be applied in motor-driven applications, lightweight flight applications and lighting applications among others.

Claims

1. An electroactive polymer actuator comprising:

an open frame and electroactive polymer material stretched within the frame to form a diaphragm,

wherein the diaphragm is free to actuate in at least two component directions upon application of voltage for output from the actuator,

wherein the electroactive polymer comprises at least one acrylic layer, and

wherein at least one weighting element is provided to tune the actuator to a resonance frequency of between about 50 and about 200 Hz.

2. The actuator of claim 1, wherein the frequency is between about 0.1 and about 300 Hz.

3. The actuator of claim 1, configured as a frustum-type device, wherein the weighting is provided in connection with a central cap for the diaphragm.

4. The actuator of claim 1, configured as a bow-type device, wherein the weighting is provided in connection with the frame.

5. The actuator of claim 1, configured as a bowtie-type device, wherein the weighting is provided in connection with the frame.

6. The actuator of claim 1, configured as a saddle-shaped device, wherein the weighting is provided in connection with the frame.

7. The actuator of claim 1, configured as a spider type device, wherein the weighting is provided in connection with the frame.

8. The actuator of claim 1, further comprising a biasing element to bias the diaphragm in at least one component direction.

9. The actuator of claim 8, wherein the biasing element is a spring mechanism.

10. An electroactive polymer actuator comprising an open frame and electroactive polymer material stretched within the frame to form a diaphragm, wherein the diaphragm is free to actuate in at least two component directions upon application of voltage for output from the actuator, wherein the electroactive polymer comprises at least one acrylic layer, the improvement consisting of:

at least one weighting element to tune the actuator to a resonance frequency of between about 50 and about 200 Hz.

11. The actuator of claim 10, wherein the frequency is between about 0.1 and about 300 Hz.

12. The actuator of claim 10, configured as a frustum-type device, wherein the weighting is provided in connection with a central cap for the diaphragm.

13. The actuator of claim 10 configured as a bow-type device, wherein the weighting is provided in connection with the frame.

14. The actuator of claim 10, configured as a bowtie-type device, wherein the weighting is provided in connection with the frame.

15. The actuator of claim 10, configured as a saddle-shaped device, wherein the weighting is provided in connection with the frame.

16. The actuator of claim 10, configured as a spider type device, wherein the weighting is provided in connection with the frame.

17. The actuator of claim 10, further comprising a biasing element to bias the diaphragm in at least one component direction.

18. The actuator of claim 17, wherein the biasing element is a spring mechanism.

19. A method of driving an electroactive polymer actuator comprising:

providing an a device as described in claim 1;

and

applying voltage for actuation of the device between about 50 Hz and about 200 Hz.

20. The method of claim 19, wherein the actuation is for a pump.

21. The method of claim 19, wherein the actuation is for a valve.

22. The method of claim 19, wherein the actuation is for converting linear motion into rotary motion.

23. The method of claim 22, wherein the rotary motion is incremental.

24. The method of claim 22, wherein the rotary motion is continuous.

25. The method of claim 19, wherein the frame is coupled to provide actuator output.

26. The method of claim 19, wherein the diaphragm provides actuator output.

27. The method of claim 19, wherein the actuation modifies light.

28. The method of claim 27, wherein the actuator is tuned to a resonance frequency imperceptible to the human eye.

29. The method of claim 27, wherein the resonance frequency is greater than 25 Hz.

30. The method of claim 29, wherein the resonance frequency is 120 Hz.

31. A method of making an electroactive polymer actuator comprising:

providing an open frame and electroactive polymer material comprising at least one acrylic layer stretched within the frame to form a diaphragm, wherein the diaphragm is free to actuate in at least two component directions upon application of voltage for output from the actuator, and

weighting the actuator so that its resonance frequency is between about 50 and about 200 Hz.

32. The method of claim 31, wherein at least one mass is attached to the frame.

33. The method of claim 31, wherein at least one mass is attached to the polymer material.