Electrophotography – Image formation – Development
Reexamination Certificate
2011-04-12
2011-04-12
Gray, David M (Department: 2852)
Electrophotography
Image formation
Development
C399S262000, C430S110400
Reexamination Certificate
active
07925190
ABSTRACT:
The invention provides a developer supply device, a developer container, a developer and an image forming apparatus such that the developer is discharged stably from the developer container with a stable toner concentration in the developer, without damaging the developer, and in a relatively simple and small-size device having a relatively high degree of freedom as regards layout. The developer supply device comprises a partially or wholly deformable developer container and a pump for suctioning the developer held in the developer container, together with a gas, and for discharging the developer towards a developing unit. The toner comprises an additive formed so as to have a volume average particle size of 50 to 500 nm. The carrier is formed so as to have a weight average particle size of 20 to 60 μm. The developer is formed so that the carrier concentration thereof is 1 to 30 wt %.
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Dr. Alan Rawle, Particle Sizing—An Introduction, 20001-2005 copy right, Silver Colloids, Tutorials, pp. 1-4.
Matsumoto Keiko
Okaji Hiroyuki
Uno Mugijirou
Gray David M
Gray Francis
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
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