Piezoelectric/electrostrictive device and method of manufacturing same

• US 6,796,011 B2
• Filed: 03/26/2002
• Issued: 09/28/2004
• 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, Namerikawa, Masahiko, Shibata, Kazuyoshi
• Primary Examiner(s): Arbes, Carl J.
• Assistant Examiner(s): Nguyen, Tai
• Application Number:
  US10/106,141
• Publication Number:
  US 20020101133A1
• Time in Patent Office: 917 Days
• Field of Search: 29/253.5, 29/254.2, 298/30, 296/09, 310/328
• US Class Current: 29/25.35
• CPC Class Codes: H10N 30/053 by integrally sintering piezoelectric or electrostrictive 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 29/435 Solid dielectric type
• CPC Class Codes: Y10T 29/49078 Laminated
• CPC Class Codes: Y10T 29/49126 Assembling bases

Abstract

A piezoelectric/electrostrictive device includes a pair of mutually opposing thin plate sections, a movable section, and a fixing section for supporting the thin plate sections and the movable section. Piezoelectric/electrostrictive elements are arranged on at least one thin plate section of 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 fixing section. The piezoelectric/electrostrictive device has a mechanism for restricting amplitude of the thin plate sections. The mechanism includes a cavity portion formed in the inner wall of the movable section and a stopper member provided on the inner wall of the fixing section, wherein the forward end of the stopper member extends into the cavity portion.

Claims

1. A method of producing a piezoelectric/electrostrictive device having a pair of mutually opposing thin plate sections, a movable section, and a fixing section for supporting said thin plate sections and said movable section, said piezoelectric/electrostrictive device comprising:

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 fixing section, comprising the step of;

producing said piezoelectric/electrostrictive device and forming a mechanism for restricting amplitude of said thin plate sections by cutting off a predetermined portion of said thin plate sections after forming said piezoelectric/electrostrictive elements on at least the thin plate sections.

2. The method for producing a piezoelectric/electrostrictive device according to claim 1, wherein said thin plate sections, said fixing section, said movable section and said mechanism for restricting amplitude of said thin plate sections are formed by a ceramic laminate, said ceramic laminate being produced by firing a ceramic green laminate containing first ceramic green sheets, second ceramic green sheets for constituting said mechanism for restricting amplitude of said thin plate sections and third ceramic green sheets for constituting said thin plate sections integrally, said first ceramic green sheets each having a window for forming at least said hole;

and

forming said piezoelectric/electrostrictive elements on a part of an outer surface of said ceramic laminate for constituting said thin plate sections

said method further comprising the step of producing said piezoelectric/electrostrictive device having said mechanism for restricting amplitude of said thin plate sections by cutting at least once said ceramic laminate having said piezoelectric/electrostrictive element.

3. A method of producing a piezoelectric/electrostrictive device, comprising the steps of:

providing a precursor structure including a portion for defining a fixing section, a portion for defining a pair of mutually opposing thin plate sections, and a portion for defining movable sections at distal ends of the thin plate sections; and

subsequently performing a cutting operation on said thin plate sections to form (i) the fixing section for supporting the pair of mutually opposing thin plate sections having movable sections at distal ends thereof, (ii) a hole defined by both inner walls of the pair of thin plate sections, an inner wall of the movable section, and an inner wall of the fixing section, and (iii) a mechanism for restricting amplitude of the thin plate sections.