Piezoelectric/electrostrictive device and method of manufacturing same

• US 6,448,691 B1
• Filed: 09/22/2000
• Issued: 09/10/2002
• Est. Priority Date: 10/01/1999
• Status: Expired due to Fees

• Current Assignee: NGK Insulators Limited
• Original Assignee: NGK Insulators Limited
• Inventors: Kimura, Koji, Takeuchi, Yukihisa, Nanataki, Tsutomu
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Addison, Karen B
• Application Number:
  US09/668,324
• Time in Patent Office: 718 Days
• Field of Search: H01/L 4.108, 310/324, 310/328, 310/358
• US Class Current: 310/324
• CPC Class Codes: H10N 30/05 Manufacture of multilayered piezoelectric or electrostrictive devices, or parts thereof, e.g. by stacking piezoelectric bodies and electrodes
• CPC Class Codes: H10N 30/2043 connected at their free ends, e.g. parallelogram type
• CPC Class Codes: Y10T 29/42 Piezoelectric device making
• CPC Class Codes: Y10T 29/49005 Acoustic transducer
• CPC Class Codes: Y10T 29/49126 Assembling bases
• CPC Class Codes: Y10T 29/49128 Assembling formed circuit to base
• CPC Class Codes: Y10T 29/49574 Musical instrument or tuning fork making
• CPC Class Codes: Y10T 29/49789 Obtaining plural product pieces from unitary workpiece
• CPC Class Codes: Y10T 29/49798 Dividing sequentially from leading end, e.g., by cutting or breaking

Abstract

A piezoelectric/electrostrictive device includes a pair of mutually opposing thin plate sections, a movable section, and a fixation section for supporting the thin plate sections and the movable section. One or more piezoelectric/electrostrictive elements are arranged on the pair of thin plate sections. A hole is formed by both inner walls of the pair of thin plate sections, an inner wall of the movable section, and an inner wall of the fixation section. At least one thin plate section of the pair of thin plate sections is previously bent in a direction to make mutual approach so that it has an inwardly convex configuration to the hole.

Claims

1. A piezoelectric/electrostrictive device comprising:

a pair of mutually opposing thin plate sections, a movable section, and a fixation section for supporting said thin plate sections and said movable section;

one or more piezoelectric/electrostrictive elements arranged on at least one thin plate section of said pair of thin plate sections; and

a hole formed by both inner walls of-said pair of thin plate sections, an inner wall of said movable section, and an inner wall of said fixation section, wherein;

at least one thin plate section of said pair of thin plate sections is previously bent in a direction to make mutual approach.

3. The piezoelectric/electrostrictive device according to claim 1, wherein at least one thin plate section of said pair of thin plate sections is previously bent inwardly toward said hole in a convex configuration.

4. The piezoelectric/electrostrictive device according to claim 1, wherein 0<

δ

≦

0.13 L is satisfied provided that a bent amount of said thin plate section is δ

, and a distance between said inner walls of said movable section and said fixation section is L.

5. The piezoelectric/electrostrictive device according to claim 1, wherein said thin plate section, said movable section, and said fixation section are composed of a ceramic substrate integrated into one unit by simultaneously sintering a ceramic green laminate and cutting off unnecessary portions.

6. The piezoelectric/electrostrictive device according to claim 5, wherein said piezoelectric/electrostrictive element has a film-shaped configuration, and at least any one of a pair of electrodes and/or a piezoelectric/electrostrictive layer is integrated with said ceramic substrate by means of sintering.

7. The piezoelectric/electrostrictive device according to claim 1, wherein said piezoelectric/electrostrictive element has a piezoelectric/electrostrictive layer and a pair of electrodes formed on said piezoelectric/electrostrictive layer.

8. The piezoelectric/electrostrictive device according to claim 1, wherein said piezoelectric/electrostrictive element has a piezoelectric/electrostrictive layer and a pair of electrodes formed on both sides of said piezoelectric/electrostrictive layer, and one electrode of said pair of electrodes is formed on at least said thin plate section.

9. The piezoelectric/electrostrictive device according to claim 7, wherein said piezoelectric/electrostrictive element is constructed in a stacked form comprising a plurality of said piezoelectric/electrostrictive layers and said electrodes.

10. The piezoelectric/electrostrictive device according to claim 1, wherein said hole is filled with a gel material.

2. A piezoelectric/electrostrictive device comprising:

a pair of mutually opposing thin plate sections, a movable section, and a fixation section for supporting said thin plate sections and said movable section;

one or more piezoelectric/electrostrictive elements arranged on at least one thin plate section of said pair of thin plate sections; and

a hole formed by both inner walls of said pair of thin plate sections, an inner wall of said movable section, and an inner wall of said fixation section, wherein;

said pair of thin plate sections are previously bent in directions to make mutual approach.