| 摘要 |
PURPOSE:To obtain a high-quality picture without photographic fog, by combining magnetic carrier particles and toner particles which have particle sizes smaller than conventional these materials and have average particle sizes within specific ranges and setting the gap between surfaces of a developer carrier and an image carrier to a specific value or less. CONSTITUTION:A carrier is used which has an average particle size of 5-30mu smaller than the conventional that and consists of magnetic particles which consist of magnetic materials of metals such as Fe, Ni, and Co or their alloys or oxides or magnetic particles having a specific resistance of >=18<8>OMEGAcm which are obtained by coating these magnetic materials with a styrene resin or the like. Particles which includes or do not include fine magnetic particles and have an average particle size of 1-10mu are used as a toner. It is desirable that <=30wt% fine magnetic particles are included in the toner. A developer 8 where said carrier and toner are combined is used, and the gap between surfaces of a developer carrier 3 having magnets 5 and an image carrier (photsensitive drum) 9 is set to 10-500mu, and development is performed. Thus, a high-density clear picture without photographic fog is obtained on an ordinary paper. |
