Capacitive sensing employing thin film inductors
US4648087A · kind A · utility
32Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1984 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Jun 28, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B9/07
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A capacitive variation sensor includes one or more elements providing inductive reactance in the form of thin film coils. This enables a capacitive variation sensor to be integrated on a substrate along with a thin film magnetic read/write head. One element of the capacitive variation sensor is a sensing electrode, and in some embodiments of the invention a dedicated sense electrode can be eliminated by employing the pole tips of the thin film magnetic read/write head as the sense electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.