Design for constructing an input circuit to receive and process an electrical signal
US6670557B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2001 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Oct 23, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/1173
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A design for constructing an input circuit to receive and process an electrical signal, such as a voltage signal from a voltage source, where the input circuit has an extremely high resistance of at least 1011 ohms and is located on a printed circuit board. A first area of the printed circuit board carrying components of the input circuit is separated from a second area surrounding or contiguous to it by a channel-shaped recess to preserve the high resistance of the circuit even under operating conditions and at high relative humidity. The circuit is configured in such a way that the channel-shaped recess terminates in the interior of the printed circuit board and is extended in the direction of the thickness of the printed circuit board immediately up to a moisture-impermeable barrier layer which underlies the first area of the printed circuit board. The channel-shaped recess and the first area are filled and surrounded by a cohesive moisture-impermeable material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.