Electrophotography – Control of electrophotography process – Control of developing
Patent
1998-01-21
1999-11-16
Brase, Sandra
Electrophotography
Control of electrophotography process
Control of developing
44 59, G03G 1500
Patent
active
059872721
ABSTRACT:
A test patch image is formed and the density thereof is detected to maintain the image quality at a constant level. One of the image forming conditions, for example, the developing bias voltage of the developing unit inside the image forming apparatus that serves as a density controller, and is controlled in accordance with the detection result. Here, a humidity sensor for detecting the environmental change, that is, the humidity, is provided inside the apparatus, and the reference value of the toner mixing ratio is changed and corrected while the developing unit is operating when the humidity sensor detects a change in humidity. However, the toner mixing ratio is maintained and neither changed nor corrected when the density of the test patch image remains at the same level, so that the developing bias voltage is not corrected. Consequently, the correction of the toner mixing ratio is neither changed nor corrected in response to the change in humidity alone, thereby making it possible to maintain a stable image quality state.
REFERENCES:
patent: 5146273 (1992-09-01), Yamada
Maeda Yasutaka
Nagayama Katsuhiro
Ohta Toshihiro
Brase Sandra
Conlin David G.
Grainger Quana
Sharp Kabushiki Kaisha
Tucker David A.
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