Position-sensitive photodetector and light transmissive tablet and light-emitting pen
US4794634A · kind A · utility
120Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1986 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Aug 13, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L67/131
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The data input device comprises a tablet portion made of a two-dimensional position-sensitive photodetector and a planar display element laid one on the other, and a light emitting pen forming a light spot on a light-receiving surface of the position-sensitive photodetector. The locus of the movement of the light emitting pen is displayed on the surface of the planar display element at correspond positions in accordance with the output of the two-dimensional position-sensitive photodetector, and the contents of the display provided on the planar displaying element are allowed to be delivered for subsequent processings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.