Light biased photoresponsive array
US4910412A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1989 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Apr 17, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high density planar array of substrate-supported, thin film diodes constituting photoresponsive semiconductor elements is placed between a document to be read and a light source for illuminating the document. The document is illuminated by the light source via windows in the array, reflected light from the document impinging on the photoresponsive elements constituted by the diodes which are electronically interrogated to provide a signal which is indicative of image information on the document. The light source directly illuminates small portions of each diode to establish a discharge or bias current that makes the array more sensitive and responsive. The high density diodes of the array can be formed in a manner that minimizes leakage current between adjacent diodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.