Image forming apparatus
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United States of America Patent
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Aug 5, 2014
Grant Date -
Jul 19, 2012
app pub date -
Jan 11, 2012
filing date -
Jan 17, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An image forming apparatus having an image bearing member, a charger to charge the surface of the image bearing member, an irradiator to irradiate the image bearing member to form the latent image, a developing device to develop the latent electrostatic image with toner to obtain a visible image, a transfer device to transfer the visible image to a transfer medium by a transfer bias applied to a transfer area between the image bearing member and the transfer member, and a voltage detector to measure a first surface voltage and a second surface voltage under different conditions, and a life expectancy identification device to identify whether or when the expected working life of the image bearing member has come to the end based on a comparison of the first surface voltage and the second surface voltage.
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