Image forming apparatus having a device for measuring an original density
US5134438A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1991 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Oct 1, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/043
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus is provided with an original density detecting device for detecting the original density, and output characteristic switching device for switching the output characteristic relative to the original density detected by the original density detecting device to a plurality of types of predetermined output characteristics. The original density is found on the basis of a predetermined output characteristic out of the plurality of output characteristics of the original density detecting device and an output of the original density detecting device. Then, an output characteristic showing a high rate of change in the vicinity of the original density found by the first original density measuring device out of the plurality of output characteristics is selected by selecting device. When the selected output characteristic is different from the output characteristic used for measuring the original density by the first original density measuring device, the output characteristic of the original density detecting device is switched to the selected output characteristic, and the original density is found on the basis of the selected output characteristic and the output …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.