| 摘要 |
A two-component developer and an image formation method for two-component development type are provided. With this developer and this method, even if toners have a small grain diameter and a high density of pigments for economizing the toner consumption, cracking and toner spent caused by the stress from carriers are suppressed, so that less deteriorated and stabler images can be obtained throughout a long time period. The two-component developer includes toner particles containing at least a binding resin and a pigment. A mean volume particle diameter of the toner particles is between 5.51 mum and 7 mum. A number percent of the toner particles with a mean volume particle diameter of 5 mum or below, and a volume percent of the toner particles with a mean volume particle diameter between 8 mum and 12.7 mum, with respect to the total toner particles, respectively, are set to be within a predetermined range. Density of the pigment in the toner particles is between 8 weight percent and 20 weight percent. The two-component developer also includes carrier particles which are resin-coated carrier particles. A mean volume particle diameter of the carrier particles is between 35 mum and 65 mum. The two-component developer allows the formation of less deteriorated and stabler images throughout a long time period.
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