Image forming apparatus and method for calculating a toner degradation rate
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United States of America Patent
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Jun 5, 2018
Issued Date -
Jul 13, 2017
app pub date -
Oct 18, 2016
filing date -
Jan 13, 2016
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Abstract
An image forming apparatus includes a toner pattern bearer to bear a first toner pattern having a first image area and a second toner pattern having a second image area different from the first image area. A toner adhesion amount detector detects a toner adhesion amount of toner of each of the first toner pattern and the second toner pattern. A toner degradation rate calculator calculates a first deviation in the toner adhesion amount of the first toner pattern and a second deviation in the toner adhesion amount of the second toner pattern based on the toner adhesion amount detected by the toner adhesion amount detector. The toner degradation rate calculator compares the first deviation with the second deviation and calculates a toner degradation rate based on a comparison result.
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