HIGH-PERFORMANCE ELECTROACTIVE POLYMER TRANSDUCERS

• US 20090174293A1
• Filed: 03/13/2009
• Published: 07/09/2009
• Est. Priority Date: 03/21/2005
• Status: Active Grant

• Current Assignee: Bayer Materialscience AG (Covestro AG)
• Original Assignee: Artificial Muscle, Inc. (Covestro AG)
• Inventors: HEIM, Jon
• Granted Patent: US 7,923,902 B2
• Time in Patent Office: Days
• US Class Current: 310/354
• CPC Class Codes: F04B 43/0054 particularities of the flexible members
• CPC Class Codes: F04B 43/04 Pumps having electric drive
• CPC Class Codes: G02B 13/009 having zoom function
• CPC Class Codes: G02B 7/102 controlled by a microcomputer cameras with interchangeable lenses G03B17/14
• CPC Class Codes: H04R 19/02 Loudspeakers H04R19/01 takes precedence
• CPC Class Codes: H10N 30/206 using only longitudinal or thickness displacement, e.g. d33 or d31 type devices
• CPC Class Codes: Y10S 310/80 Piezoelectric polymers, e.g. PVDF

Abstract

Electroactive polymer constructions that convert electrical energy to mechanical energy and vice versa are disclosed. The subject transducers (actuators, generators, sensors or combinations thereof) share the requirement of a frame or fixture element used in preloading elastomeric film electrodes and dielectric polymer in a desired configuration. The structures are either integrally biased in a push-pull arrangement or preloaded/biased by another element.

Claims

1. An electroactive polymer transducer comprising:

an open frame and electroactive polymer material,

wherein the polymer material is stretched into a frustum shape.

3. The transducer of claim 1, wherein the remaining portions of one diaphragm layer are spaced from the remaining portions of the other diaphragm layer to form a double-frustum configuration.

4. The transducer of claim 1, wherein the coupled-together central portions define a cap structure.

5. The transducer of claim 4, wherein the cap structure has a disc configuration having a least one pass-through hole.

6. The transducer of claim 1, wherein the electroactive polymer material comprises one of silicone, acrylic or polyurethane.

7. The transducer of claim 1, wherein the electroactive polymer material comprises a dielectric elastomer.

8. The transducer of claim 1 wherein one diaphragm layer biases the other diaphragm layer.

9. The transducer of claim 1, wherein a spring biases at least one diaphragm layer.

2. A transducer comprising an open frame and at least two diaphragm layers, each diaphragm layer comprising an electroactive polymer material extending within the frame, wherein central portions of the diaphragm layers are coupled together and wherein the diaphragm layers are free to actuate in at least two directions upon application of a voltage across the electroactive polymer material.

10. A device comprising:

an open frame; and

electroactive elastomer material secured within the frame and a region central to the elastomer material which form a diaphragm;

wherein the central region is less flexible than the elastomer material and wherein the elastomer material is stretched to a concave or convex shape.

11. The device of claim 10, wherein the central region comprises a substantially rigid cap.

12. The device of claim 11, wherein the spring is a selected from a leaf spring and a coil spring.

13. The device of claim 11, wherein the spring biases the electroactive elastomer material out of plane.

14. The device of claim 11, wherein the diaphragm forms a frustum structure.

15. The device of claim 10, wherein the central region is imperforate.

16. The device of claim 10, wherein the central region has an interior open section.

17. The device of claim 10, wherein device is adapted to operate as a sensor.

18. The device of claim 10, wherein device is adapted to operate as an actuator.

19. The device of claim 10, comprising at least two diaphragms wherein each of the at least two elastomeric material sections are stretched into frustum shapes.

20. The device of claim 19, wherein one diaphragm biases another diaphragm.

21. The device of claim 19, wherein the frustum sections face opposite one another.

22. The device of claim 19, wherein the frustum sections face towards one another.

23. The device of claim 19, wherein the central regions are ganged together.

24. The device of claim 10, wherein the elastomeric material comprises a plurality of independently addressed sections.

25. An assembly comprising a plurality of stacked diaphragms according to claim 10.

26. The device of claim 25, wherein the stacked diaphragms are connected in series.

27. The device of claim 25, wherein the stacked diaphragms are connected in parallel.

28. The device of claim 25, wherein a portion of the stacked diaphragms faces in one direction and another portion of the stacked diaphragms faces in an opposite direction.