Pressure-sensitive light pen
US4705942A · kind A · utility
61Cited by
11References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1985 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Dec 26, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03542
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A light pen which includes a transparent rod at its pointing end through which light is directed to a photodetector that is fixedly positioned within the light pen. The rod is spring loaded and axially slidable in response to applied pressure, resulting in different light intensities being applied to the photodetector and further resulting in an output voltage generated by the photodetector that is directly related to the applied pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.