Sensor contact
US4194840A · kind A · utility
Inventors
Key dates
| Filing date | Feb 27, 1978 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Feb 27, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/86
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensing element having a face adapted to contact the surface of a travelling web or sheet of paper, said face formed into a convex surface that substantially is in the form of a single base segment of a sphere having a radius between 35 and 10 mm. The surface of the web is pressed against the face so that the area of contact between the surface and the face has a minimum dimension of 2 mm. In the preferred application of the present invention the element is as an optical window in an optical sensing device wherein light is passed through the window in a direction and is reflected to sensors positioned on the same side of the window as the light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.