Tape transducer
US4382196A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1981 |
| Grant date | May 3, 1983 |
| Priority date | — |
| Expiry date | Mar 16, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R19/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tape transducer comprising an inner conductive strip laminate sandwiched between and totally enclosed by identical outer conductive strip laminates. The inner laminate has an inner conductive strip having opposite sides to which thin dielectric layers are bonded, the layers being electrically charged to form electrets having electrical charges of the same polarity on their outer surfaces. Each outer laminate has a conductive foil with marginal side portions overlying the side edges of the inner laminate and sealed together. The portions of the outer laminates aligned with the inner laminate are capable of simultaneously moving toward and away from the inner laminate for advantageously generating sonic waves in a transmitting mode and for efficiently generating an electrical signal in a receiving mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.