Electrostatic transducer backplate having open ended grooves
US4311881A · kind A · utility
15Cited by
6References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1979 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Jul 5, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D39/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The desired groove shape in a backplate of a combination transmitting and receiving, capacitance type, electrostatic transducer are more consistently reproduceable in a die forming operation by utilizing an open ended grooved configuration so that groove shape deforming lubricating fluid, necessary in said die forming operation, and air, can escape from between the die tool and the transducer backplate through said open ended grooves as said grooves are die formed on said backplate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.