Image forming apparatus capable of estimating toner concentratio

Details Image forming apparatus capable of estimating toner concentratio Image forming apparatus capable of estimating toner concentratio

1996-01-18

1999-07-06

Royer, William

Electrophotography

Control of electrophotography process

Control of developing

399 60, G03G 1508

Patent

active

059207485

ABSTRACT:
An image forming apparatus, such as an electrophotographic copier, forms a test image on a photosensitive member, under constant image forming conditions, and the amount of toner adhering to the photosensitive member is detected. The detected amount of toner is converted into a developer toner concentration, based on a conversion standard. The toner concentration is used to control the operation of a toner replenishment device. The conversion standard is periodically corrected by forming a test image using a developer having a known toner concentration, detecting the amount of adhered toner, comparing the detected result to a standard value, and selecting one conversion standard table from among a number of different conversion tables.

REFERENCES:
patent: 4956668 (1990-09-01), Arnold et al.
patent: 5043764 (1991-08-01), Arnold et al.
patent: 5146274 (1992-09-01), Hattori et al.
patent: 5275904 (1994-01-01), Shimizu et al.
patent: 5579091 (1996-11-01), Yamada et al.

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