Patent · US Active

Capacitive positioning device

US9588162B2 · kind B2 · utility

2Cited by

1References

11Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Tobias Zibold · Stuttgart, DE
Andrej Albrecht · Stuttgart, DE

Key dates

Filing date	Feb 14, 2013
Grant date	Mar 7, 2017
Priority date	—
Expiry date	Sep 4, 2033

Classification

Technology area (CPC G)Physics
CPC primaryG01V3/088
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A positioning device for capacitively detecting an object enclosed in a medium includes a measuring electrode, a reference electrode, and a receiving electrode. The measuring electrode with the receiving electrode forms a measuring capacitance, which can be influenced by the object. The reference electrode with the receiving electrode forms a reference capacitance, which cannot be influenced by the object. The positioning device further includes an oscillator configured to supply the measuring capacitance and the reference capacitance with phase-shifted AC voltages and a control device configured to control amplitudes of at least one of the AC voltages, in order to adapt effects of electrical fields of the measuring electrode or of the reference electrode on the receiving electrode to one another. The measuring, reference, and receiving electrodes are planarly formed. The measuring electrode has a larger surface area than the reference electrode.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.