Exposure control device of copying machine
US4831418A · kind A · utility
5Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1987 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Mar 4, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0485
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An exposure control device of a copying machine is provided with a white member at an end portion of an original document holding surface of a platen so as to prevent adhesion of toners to a top end portion of the copying paper. While a scanning optical system moves from the scan start point to the border between the original document and the white member, sufficient light quantity to prevent fogging of the image of the white member is supplied by the exposure lamp. The light quantity of the exposure lamp is changed to a suitable value corresponding to the original document in response to a signal for detecting the border.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.