Apparatus for point-by-point reading of documents using photodetector matrix
US4604527A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1983 |
| Grant date | Aug 5, 1986 |
| Priority date | — |
| Expiry date | Nov 10, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/1931
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a point-by-point reading apparatus using a matrix of photodetector elements. The reading apparatus comprises a system of p groups of q basic elements, which are aligned, each of these basic elements being constituted by a photodiode and a diode insensitive to the light radiation and connected in opposition. These basic elements are addressed by an input circuit of the shift register type with p connections, each connected to all the diodes of the same group. The state of the photodiodes is collected in an output circuit with q connections, each connected to all the photodiodes occupying a particular rank in a group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.