| 摘要 |
It is intended to provide a developing apparatus, an image forming apparatus and developing method capable of managing both decrease of load on apparatuses and improvement of image quality in case development of an image is made by applying contact developing and AC developing. For that intention, voltage at a portion between a development member and an image carrier is defined oscillating voltage, and in case negative polarity toner is used, relations of peak voltage V 1 of oscillating voltage, background portion voltage VH (negative) and visible section voltage VL (negative, an absolute value of it is smaller than that of VH) are set as indicated below. <?in-line-formulae description="In-line Formulae" end="lead"?>-500V<=V1-VL<=-350V<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>-200V<=V1-VH<=-50V<?in-line-formulae description="In-line Formulae" end="tail"?> On the above conditions, peak voltage V 2 is set as indicated below. <?in-line-formulae description="In-line Formulae" end="lead"?>-150V<=VL-V2<=-70V<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>V2<=VH+500V.<?in-line-formulae description="In-line Formulae" end="tail"?>
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