Claims
- 1. A method for manufacturing a piezoelectric ceramic transformer having an interdigital electrode assembly provided on a surface of the piezoelectric ceramic comprising the steps of:
- providing an inactive piezoelectric substrate having its largest dimension in a longitudinal direction;
- disposing on a surface of said piezoelectric substrate strips of conductive material, said piezoelectric substrate strips being provided by a coating operation;
- energizing said strips with high polarizing voltage so as to polarize said piezoelectric substrate in only the longitudinal direction of said piezoelectric substrate;
- removing said strips from said surface; and
- forming conductive electrodes on said surface of said piezoelectric substrate, said conductive electrodes being aligned with the positions originally occupied by said strips.
- 2. The method of claim 1, wherein said strips traverse an entire width of said substrate, and wherein the length of said strips is at least equal to the overall width of the interdigital electrodes to be formed.
- 3. A method for manufacturing a piezoelectric ceramic transformer having an interdigital electrode assembly provided on a surface of a piezoelectric ceramic plate; a first part of the interdigital electrode assembly being made up of a plurality of electrode fingers spaced at intervals and parallel to the direction of width of the piezoelectric ceramic plate and a connecting electrode linking these electrode fingers; said first part and a second part of similar construction to said first part being arranged such that electrode fingers of both said first and second parts alternately project so as to oppose each other across the width of the piezoelectric ceramic plate; comprising the steps of:
- providing an inactive piezoelectric ceramic substrate having its largest dimension in a longitudinal direction;
- disposing on a surface of said piezoelectric substrate strips of conductive material, said piezoelectric substrate strips being formed by a coating operation, each traversing the width of said surface;
- energizing said strips with high polarizing voltage so as to polarize said piezoelectric substrate in only the longitudinal direction of said piezoelectric substrate;
- removing said strips from said surface;
- forming said first part of said interdigital electrode assembly by forming said plurality of electrode fingers on said surface of said piezoelectric substrate on alternating locations previously occupied by respective ones of said strips;
- forming said second part of said interdigital electrode assembly by forming a second set of plurality of electrode fingers on said surface of said piezoelectric substrate on remaining alternating locations previously occupied by other ones of said strips; and
- forming connecting electrodes, each linking said electrode fingers and said second set of plurality of electrode fingers, respectively.
- 4. The method for manufacturing an interdigital electrode assembly according to claim 3, wherein the distance between said electrode fingers and an opposing connecting electrode is less than the inter distance between opposing electrode fingers.
Priority Claims (3)
Number |
Date |
Country |
Kind |
6-174415 |
Jul 1994 |
JPX |
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6-174416 |
Jul 1994 |
JPX |
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6-174417 |
Jul 1994 |
JPX |
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Parent Case Info
This is a divisional of application Ser. No. 08/348,925 filed Nov. 25, 1994 U.S. Pat. No. 5,576,590.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0605900A1 |
Jul 1994 |
EPX |
0079778 |
May 1983 |
JPX |
Non-Patent Literature Citations (3)
Entry |
"Piezoelectric Transformers", Electronics Letters, Mar. 31, 1988, vol. 24, No. 7, pp. 444-445. |
"Ceramic Transformers and Filters", Proc. Electronic, Comp. Sym., 1956, pp. 205-211. |
"Multilayered Piezoelectric Transformer", Ferroelectrics, 1985, vol. 63, pp. 299-308. |
Divisions (1)
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Number |
Date |
Country |
Parent |
348925 |
Nov 1994 |
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