POLING OF FERRO-ELECTRIC SUBSTRATES

• US 3,761,746 A
• Filed: 11/08/1971
• Issued: 09/25/1973
• Est. Priority Date: 11/08/1971
• Status: Expired due to Term

• Current Assignee: Robert Adler
• Original Assignee: Robert Adler
• Inventors: Adler, Robert
• Primary Examiner(s): Miller, J. D.
• Assistant Examiner(s): Budd, Mark O.
• Application Number:
  US05/196,351
• Time in Patent Office: 687 Days
• Field of Search: 264/22,24,108,DIG.45 29/25.35 310/8,8.1
• US Class Current: 310/311
• CPC Class Codes: H01G 7/026 with ceramic dielectric
• CPC Class Codes: H10N 30/045 by polarising
• CPC Class Codes: Y10T 29/42 Piezoelectric device making

Abstract

Ferro-electric bodies are poled by employing an ionized gas or other medium as a poling electrode.

Claims

1. The method of poling a ferro-electric ceramic body comprising the steps of:

exposing the opposed major surfaces of said body respectively to two electrically and mechanically isolated regions of ionization; and

establishing an electric unidirectional potential difference between said regions of ionization.

2. The method of poling a piezoelectric ceramic body comprising the steps of:

sealing the body in a closed container of electrical insulating material to divide the interior of said container into two sub-chambers hermetically sealed and electrically isolated from each other;

reducing the pressure in each of said sub-chambers to a pressure substantially below atmospheric pressure;

independently ionizing the residual gas in each of said sub-chambers; and

establishing a DC potential difference between the ionized gas in said sub-chambers.

3. The method as defined in claim 2 wherein said ionizing step includes establishing an electric field in each of said sub-chambers of a strength sufficient to establish a glow discharge therein.