| 摘要 |
PURPOSE:To obtain a two-component type developer for an electrophotographic device applying a toner concn. controlling system and causing little change in printing density by using a magnetic material converted into a permanent magnet as a carrier. CONSTITUTION:The composition of a developer is composed of a toner and a carrier for sticking and transferring the toner made of a magnetic material converted into a permanent magnet. When the carrier is magnetized beforehand, magnetic attraction is produced among particles of the carrier, and the toner sticks electrostatically to the carrier when the developer is electrostatically charged. Even when a layer of the toner is formed on the surface of the carrier, a change in the bulk density can be inhibited because the probability that particles of the carrier contact directly with each other is increased, and the difference in bulk density between electrostatically charged state and uncharged state can be reduced, so the concn. of the toner can be detected accurately. |
