Image forming apparatus having high image quality control mechan

Details Image forming apparatus having high image quality control mechan Image forming apparatus having high image quality control mechan

1997-08-08

1999-03-23

Grimley, Arthur T.

Electrophotography

Control of electrophotography process

Control of developing

399 15, 399 44, 399 49, G03G 1501, G03G 1514

Patent

active

058872230

ABSTRACT:
An unfixed toner image of a reference pattern is formed on a photosensitive member, the unfixed toner image is measured by a development density sensor 13, and the amount of toner to be supplied to a developing device 4 is controlled by a toner supply control unit 60 on the basis of a measurement output, thereby maintaining the image quality constant. If it is judged from a result of a detection of a state amount such as the temperature and the humidity by a state amount sensor 19 that there is a fear that the image quality exceeds an allowable range, a fixed image of a reference pattern is formed on a record medium such as a banner sheet, and the fixed image is measured by an optical sensor 10. Operation amounts such as the charge amount and the exposure value of an image output unit 100 are controlled by an image density control unit 20, thereby maintaining the image quality to be within the allowable range.

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Color Research and Application, vol. 14, No. 3, Jun. 1989, "Performance Testing of Color-Difference Metrics Using a Color Tolerance Dataset", David H. Alman et al., pp. 139-151.

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