Electrophotographic developer

摘要

The present invention provides an electrophotographic developer comprising a magnetic carrier and a toner, wherein a certain voltage-dependent index Y of the developer and a number proportion X (%) of a certain non-charged toner in the total toner have a relation satisfying the following formula (3): $This\; developer\; can\; certainly\; prevent\; blur\; of\; the\; image,\; such\; as\; forward\; flow\; or\; backward\; flow,\; while\; maintaining\; a\; high\; image\; density.\mathop{\mathrm{image}}$