Circuit board for coordinate detecting apparatus with noise suppression
US5506375A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1993 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Feb 22, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/046
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A multilayer circuit board for a coordinate detecting apparatus has a sensor region having X-coordinate sensor lines which are equidistantly arranged in parallel and Y-coordinate sensor lines which are also equidistantly arranged in parallel; a processing circuit is in a periphery of the board. A first layer has signal lines which constitute the processing circuit. A second layer has grounded dummy sensor lines in a position corresponding to the signal lines on the first layer. The X and Y dummy sensor lines intersect to form mesh grounds on the second layer and cover the signal lines. Optionally, the mesh grounds are formed on a third layer, and the first layer is sandwiched between the second and third layers. The dummy sensor lines or the mesh grounds substantially block propagation of noise produced by the circuit board and help increase the size of the sensor region effective area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.