Photocopying – Contact printing – Light boxes
Patent
1991-09-11
1993-02-16
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355253, 355259, 355246, 118658, G03G 1509
Patent
active
051875233
ABSTRACT:
A developing apparatus includes a movable developer carrying member for carrying a layer of a developer containing toner particles and magnetic carrier particles to a developing zone, the toner particles and magnetic carrier particles being charged to opposite polarities; a stationary magnet disposed on a side of the developer carrying member opposite the image bearing member, the magnet forming a magnetic brush wherein the developer is contactable to the image bearing member in the developing zone; a voltage source for producing an oscillating electric field in the developing zone by application of an oscillating bias voltage to the developer carrying member; wherein the oscillating bias voltage satisfies a maximum Vu1max of a potential difference Vu1 between an image portion potential of the electrostatic image and a potential of the developer carrying member in the transfer phase of the oscillating electric field, is larger than a maximum Vr1max of a potential difference Vr1 therebetween in the back transfer phase; a time integration Iu1 of the potential difference Vu1 is larger than a time integration Ir1 of the potential difference Vr1; a maximum Vu2 max of a potential differnece Vu2 between a non-image portion potential of the electrostatic latent image and a potential of the developer carryign member in the transfer phase of the oscillating electric field, is not less than a maxiumu Vr2max of a potential difference Vr2 therebetween in the back transfer phase; and a time integration Iu2 of the potential difference Vu1 is not more than a time integration Ir2 of the potential difference Vr2.
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Canon Kabushiki Kaisha
Grimley A. T.
Smith Matthew S.
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