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US Patent 7761040 Image forming apparatus having developer with opposite polarity particles

Patent 7761040 was granted and assigned to Konica Minolta on July, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A developing unit using a two-component developer intended to provide an image forming apparatus capable of forming a high-quality image for a long period of time. A developing unit using a developer contains toner, carrier and opposite polarity particles having a polarity opposite to the charging polarity of toner includes separation means for separating the toner or opposite polarity particles, and control mechanism for controlling opposite polarity particle separation ratio in response to the image area ratio and the number of prints.

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