Conductive polymer actuator

• US 7,259,495 B2
• Filed: 11/14/2005
• Issued: 08/21/2007
• Est. Priority Date: 05/24/2004
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Asai, Katsuhiko, Yokoyama, Kazuo
• Primary Examiner(s): BUDD, MARK OSBORNE
• Application Number:
  US11/271,971
• Publication Number:
  US 20060219983A1
• Time in Patent Office: 645 Days
• Field of Search: 310/311, 310/800
• US Class Current: 310/311
• CPC Class Codes: H02N 11/006 Motors
• CPC Class Codes: Y10S 310/80 Piezoelectric polymers, e.g. PVDF

Abstract

Two conductive polymer films, one of which swells and the other of which shrinks by an oxidation-reduction reaction, are connected to a link mechanism for reciprocally converting shrinkage-directional displacements of one film to swell-directional displacements of the other film, so that driving force in the expansion direction of one conductive polymer film can be generated by driving force in contraction direction of the other conductive polymer film.

Claims

1. A conductive polymer actuator, comprising:

a first conductive polymer film and a second conductive polymer film connected via an electrolyte holding layer;

a first displacement extraction member connected to the first conductive polymer film; and

a second displacement extraction member connected to the second conductive polymer film, wherein

the first displacement extraction member and the second displacement extraction member are arranged to have a different displacement direction, and the first and second displacement extraction members are connected in such a way that a swell-directional displacement of one member is reciprocally converted to a shrinkage-directional displacement of the other member to give a potential difference to between the first conductive polymer film and the second conductive polymer film, so that one of the first conductive polymer film and the second conductive polymer film swells while the other shrinks by an oxidation-reduction reaction.

2. The conductive polymer actuator as defined in claim 1, wherein the connection between the first and second displacement extraction members is a connection via a link mechanism.

3. The conductive polymer actuator as defined in claim 1, wherein the connection between the first and second displacement extraction members is a mutual connection at locations with an angle different from an angle of respective displacement directions.

4. The conductive polymer actuator as defined in claim 1, wherein the connection between the first and second displacement extraction members is a connection via an elastic member.

5. The conductive polymer actuator as defined in claim 2, wherein the first displacement extraction member holds respective end portions of the first conductive polymer film and is electrically connected thereto, while the second displacement extraction member holds respective end portions of the second conductive polymer film and is electrically connected thereto, and

the link mechanism constitutes a parallel link mechanism with coupling members, in which the adjacent first displacement extraction member and second displacement extraction member are coupled together through the coupling members having an identical length.

6. The conductive polymer actuator as defined in claim 1, wherein the first conductive polymer film and the second conductive polymer film are arranged alternately in thickness direction.

7. The conductive polymer actuator as defined in claim 1, wherein the first conductive polymer film and the second conductive polymer film are arranged in parallel.

8. The conductive polymer actuator as defined in claim 7, wherein the first conductive polymer film and the second conductive polymer film are arranged at regular intervals.

9. The conductive polymer actuator as defined in claim 1, wherein the displacement directions of the first displacement extraction member and the second displacement extraction member are equal to longitudinal directions of the first conductive polymer film and the second conductive polymer film, respectively.

10. The conductive polymer actuator as defined in claim 1, wherein the displacement directions of the first displacement extraction member and the second displacement extraction member are orthogonal.

11. The conductive polymer actuator as defined in claim 1, wherein either one of or both the first displacement extraction member and the second displacement extraction member are connected to a guide mechanism which is movable only in displacement direction of the respective displacement extraction members.

12. A robot, comprising:

a robot arm; and

a pair of robot arm driving units structured to have an antagonist muscle structure composed of a pair of conductive polymer actuators as defined in claim 1.