Claims
- 1. The method of fabricating a dark field ultrasonic transducer having a spherical inner element and a coaxial, annular, conical outer element, comprising:
- providing a mold having a cylindrical bore leading to a cone;
- placing a metal ball at the bottom of said cone;
- filling said bore and a connecting portion of said cone with a filler material;
- curing said filler material and removing the resulting tool, which has said ball embedded in a conical surface, form said mold;
- selectively removing metal from a thin piezoelectric polymer from coated with a layer of metal to delineate said inner and outer elements, and shaping and curving said thin film with the end of said tool.
- 2. The method of claim 1 wherein said filler material is epoxy resin and said piezoelectric polymer film is polyvinylidene difluoride.
Parent Case Info
This application is a division of application Ser. No. 934,520 filed Nov. 24, 1986 now U.S. Pat. No. 4,760,304.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
2616198 |
Sewell |
Nov 1952 |
|
4346505 |
Lemonon et al. |
Aug 1982 |
|
4384394 |
Lemonon et al. |
May 1983 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
934520 |
Nov 1986 |
|