Stylus for recording on heat sensitive material
US3987493A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1975 |
| Grant date | Oct 19, 1976 |
| Priority date | — |
| Expiry date | Mar 19, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D15/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A hot stylus using a mandrel of soft material having good heat conductivity and good electrical conductivity is used to carry heat to the writing end of the mandrel. That end fits in an aperture of a jewel bearing surface which rides on the heat sensitive paper. The mandrel is soldered in a groove along a thermistor having a positive temperature coefficient. The mandrel also provides one electrical connection to the thermistor. The other electrical connection is by way of a foil contact soldered to an opposite face of the thermistor. That assembly is potted and assembled on a circuit board which provides the electrical leads from the stylus body to which the foil is soldered and from the mandrel itself.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.