Electronic two directional control apparatus
US4305007A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Aug 22, 1979 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Aug 22, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05G2009/0474
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electronic two-directional control apparatus responsive to the capacitance of an external object for generating two electrical outputs simultaneously referable as co-ordinates defining the position of an external object in relation to a control surface, four sensing electrodes of approximately equal capacitance symmetrically arranged into pairs of opposing sensing electrodes within a common plane and electrically insulated from one another whereby sensing electrodes define a control surface and whereby sensing electrode capacitances independently vary in response to the proximity of an external object thereto and are electrically connected to an electrical input in such fashion that only the positive portions of the oscillatory potential are equally applied to each sensing electrode; two pairs of resistors electrically connected to sensing electrodes for continuously receiving discharge currents originating from each pair of opposing sensing electrodes, respectively and whereby each discharge current is a function of corresponding sensing electrode capacitance; a detector circuit electrically connected to both pairs of resistors for simultaneously detecting both continuous disch…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.