Multi-segmented high deformation piezoelectric array

• US 5,781,646 A
• Filed: 05/09/1997
• Issued: 07/14/1998
• Est. Priority Date: 05/09/1997
• Status: Expired due to Term

• Current Assignee: Face International Corp.
• Original Assignee: Face International Corp.
• Inventors: Face, Samuel A.
• Primary Examiner(s): LE, HUYEN D
• Application Number:
  US08/854,080
• Time in Patent Office: 431 Days
• Field of Search: 381/173, 381/114, 381/190, 381/202, 29/25.35, 310/367
• US Class Current: 381/190
• CPC Class Codes: G10K 9/121 Flextensional transducers
• CPC Class Codes: H04R 17/00 Piezoelectric transducers; Electrostrictive transducers piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners H10N30/00
• CPC Class Codes: H04R 17/08 signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously
• CPC Class Codes: H10N 30/2041 Beam type

Abstract

A multi-segmented flextensional transducer includes a plurality of electroplated electroactive members which deform in concert when energized by an electrical field. Each electroactive member has a convex surface at one end and a concave surface at its opposite end. The electroactive members are arranged end-to-end such that the convex face of each intermediate electroactive member engages the concave face of an adjacent electroactive member, thus forming a cooperative array or "train" of electroactive members. The opposite ends of the train of -electroactive members is received by a frame which holds the end electroactive members in fixed relative position. The electroactive members are high deformation flextensional piezoelectric elements. When energized, each electroactive member individually deforms, and the entire array deforms in concert an amount significantly exceeding that of the individual electroactive members.

Claims

1. A flextensional transducer comprising:

a deformable member having first and second ends, said deformable member comprising;

a first electroactive member;

wherein said first electroactive member has opposing first and second major faces;

and wherein said first electroactive member has opposing first and second minor surfaces, said first minor surface of said first electroactive member being substantially concave;

said first electroactive member comprising a first electrode disposed on said first major face of said first electroactive member;

and said first electroactive member comprising a second electrode disposed on said second major face of said first electroactive member;

a second electroactive member;

wherein said second electroactive member has first and second opposing major faces;

and wherein said second electroactive member has first and second opposing minor surfaces, said second minor surface of said second electroactive member being substantially convex;

said second electroactive member comprising a third electrode disposed on said first major face of said second electroactive member;

and said second electroactive member comprising a fourth electrode disposed on said fourth major face of said second electroactive member;

wherein said first minor surface of said first electroactive member is engaged with said second minor surface of said second electroactive member.

2. The transducer according to claim 1,

further comprising anchoring means, said anchoring means comprising first and second frame members;

wherein said first end of said deformable member is connected to said first frame member;

and wherein said second end of said deformable member is connected to said second frame member;

whereby said anchoring means holds said first and second ends of said deformable member a fixed distance apart.

3. The transducer according to claim 2,

further comprising energizing means for electrically energizing said deformable member;

wherein said energizing means is in electrical communication with said first, second, third and fourth electrodes.

4. The transducer according to claim 3,

further comprising a first conductive member connected to said first electrode and said third electrode;

and a second conductive member connected to said second electrode and said fourth electrode.

5. The transducer according to claim 4,

further comprising means for enclosing said deformable member, said means for enclosing said deformable member being positioned adjacent to said first major face of said first electroactive member and said first major face of said second electroactive member.

6. The transducer according to claim 5,

wherein said first and second electroactive members each comprise a piezoelectric material.

7. The transducer according to claim 6,

wherein said first minor surface of said first electroactive member comprises a first face and a second face, said first face and said second face forming a first angle therebetween;

and wherein said second minor surface of said second electroactive member comprises a third face and a fourth face, said third face and said fourth face forming a second angle therebetween.

8. The transducer according to claim 7,

wherein said second angle is larger than said first angle.

9. The transducer according to claim 3,

wherein said second minor surface of said first electroactive member is substantially convex.

10. The transducer according to claim 9,

wherein said first minor surface of said second electroactive member is substantially concave.