Phase discrimination type electrostatic capacity detector
US5049824A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1989 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Dec 5, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2415
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A phase discrimination type electrostatic capacity detector includes an one-side electrode plate composed of a transmitting electrode and a receiving electrode, another-side electrode plate having coupling electrodes and disposed relatively movably with respect to the one-side electrode plate in a confronting relation with the same, a power supply connected to the transmitting electrode, and a detector circuit connected to the receiving electrode. The detector is miniaturized by disposing the transmitting electrode in a second hierarchy layer partitioned by an electrical insulating layer on a substrate and connecting in series the respective transmitting electrode elements of the same phase in a first hierarchy layer through coupling leads. The detector including a pair of receiving electrode elements between which the transmitting element is interposed, is miniaturized by leading out the coupling leads to one side end of the one-side electrode plate through a space between both receiving electrode elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.