Electrostatographic apparatus comprising automatic document type determination means
US4239374A · kind A · utility
53Cited by
6References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1978 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Dec 7, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/065
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image of an original document (16) is sensed to determine if the document (16) is a printed document (the image consists of characters and symbols) or a photographic document. The exposure illumination intensity, developing bias voltage and/or other variable operating parameters are controlled in accordance with the determination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.