Method of producing a piezoelectric or pyroelectric element

• US 3,912,830 A
• Filed: 01/18/1974
• Issued: 10/14/1975
• Est. Priority Date: 10/13/1971
• Status: Expired due to Term

• Current Assignee: Naohiro Murayama, Takao Oikawa
• Original Assignee: Naohiro Murayama, Takao Oikawa
• Inventors: Murayama, Naohiro, Oikawa, Takao
• Primary Examiner(s): Weiffenbach, Cameron K.
• Application Number:
  US05/434,732
• Time in Patent Office: 634 Days
• Field of Search: 117/217,218,107,138.8UF,216,226,16R
• US Class Current: 427/100
• CPC Class Codes: H01G 7/023 of macromolecular compounds
• CPC Class Codes: H10N 30/098 Forming organic materials
• CPC Class Codes: Y10S 310/80 Piezoelectric polymers, e.g. PVDF
• CPC Class Codes: Y10T 29/42 Piezoelectric device making

Abstract

A piezoelectric and/or pyroelectric element having improved durability is composed of a piezoelectric or pyroelectric polymer film such as a polyvinylidene fluoride film, an under coating of a thermoplastic or thermosetting resin having negligible piezoelectricity or pyroelectricity applied on the surface of a polar fluorinated polymer film, and metal electrodes vacuumdeposited on the surface of the under coating. The piezoelectric or pyroelectric element is produced by preparing the aboveindicated structure using a polar fluorinated polymer film which has not yet been provided with piezoelectricity or pyroelectricity and conducting the polarization of a polar fluorinated polymer film using the metal electrodes as the polarization electrodes.

Claims

1. A METHOD FOR PRODUCING A PIEZOELECTRIC OR PYROELECTRIC ELEMENT WHICH COMPRISES:

A. COATING THE SURFACE OF A POLAR FLUORINATED POLYMER FILM CAPABLE OF BEING PROVIDED WITH PIEZOELECTRICITY AND PYROELECTRICITY BY A POLARIZATION TREATMENT WITH A HIGH MOLECULAR WEIGHT THERMOSETTING OR THERMOPLASTIC RESIN CAPABLE OF BEING PROVIDED NEGLIGIBLE PIEZOELECTRICITY OR PYROELECTRICITY BY POLARIZATION TREATMENT, B. FORMING ON THE COATING OF SAID HIGH MOLECULAR WEIGHT RESIN THIN ELECTRODES OF A CONDUCTIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF METAL AND CARBON BY VACUUM-COATING AND C. SUBJECTING THE POLYMER FILM TO A POLARIZATION TREATMENT USING THE COATINGS OF THE CONDUCTIVE MATERIAL AS THE POLARIZATION ELECTRODES.

2. The method of claim 1, wherein said polymer film is a stretched polyvinylidene fluoride film.

3. The method of claim 1 wherein said conductive material is a metal.

4. A METHOD FOR PRODUCING A PIEZOELECTRIC OR PYROELECTRIC ELEMENT WHICH COMPRISES:

A. COATING THE SURFACE OF A POLAR FLUORINATED POLYMER FILM CAPABLE OF BEING PROVIDED WITH PEIZOELECTRICITY AND PYROELECTRICITY BY A POLARIZATION TREATMENT WITH A HIGH MOLECULAR WEIGHT THERMOSETTING OR THERMOPLASTIC RESIN CAPABLE OF BEING PROVIDED WITH NEGLIGIBLE PIEZOELECTRICITY OR PYROELECTRICITY BY POLARIZATION TREATMENT, B. FORMING ON THE COATING OF SAID HIGH MOLECULAR WEIGHT RESIN THIN ELECTRODES OF A CONDUCTIVE MATERIAL SELECRED FROM THE GROUP CONSISTING OF METAL AND CARBON BY PLATING, AND C. SUBJECTING THE POLYMER FILM TO A POLARIZATION TREATMENT USING THE COATINGS OF THE CONDUCTIVE MATERIAL AS THE POLARIZATION ELECTRODES.

5. The method of claim 4 wherein said polymer film is a stretched polyvinylidene fluoride film.

6. The method of claim 4 wherein said conductive material is a metal.