Coordinate position information output device
US3944740A · kind A · utility
65Cited by
5References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1974 |
| Grant date | Mar 16, 1976 |
| Priority date | — |
| Expiry date | Jul 22, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B29/106
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A coordinate position information output device is disclosed in which the impedance at a position addressed by a contact pen, a light pen, a magnetic pen or the like is varied; a forward current is caused to flow by the impedance change in a charge storage diode; and a backward current flowing in the charge storage diode for a moment immediately thereafter is utilized as coordinate position information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.