Manually activated position indicator

US4873400A · kind A · utility

Assignee

• Euchner GmbH & Co. · DE

Inventors

• Werner Rapp · Geislingen, DE
• Walter Link · Rutesheim, DE
• Giovanni Quinzio · Stuttgart, DE

Key dates

• Filing date: Jul 8, 1988
• Grant date: Oct 10, 1989
• Expiry date: Jul 8, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K2217/96076
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A manually activated position indicator with electrical output signals includes a plurality of adjacent electrodes (S, Al-, Al+, Bl-, Bl+, Ax-, Ax+, Bx-, Bx+,Ay-, Ay+, By-, By+), which are electrically insulated from one another and are covered on one side by an electrically insulating layer (3) the side of which opposite said electrodes is provided as a support surface for a finger (4) of the user of said position indicator wherein said electrodes form at least three groups, and all of the electrodes (S) of a first group are connected to a voltage source (5) that delivers an alternating voltage (Us). The electrodes of the other groups are connected to a signal evaluating circuit, and at least one electrode of said other groups is arranged adjacent to an electrode (S) of the first group.