Electrophotographic process with magnetic brush development using semiconductive ferrite carriers
First Claim
Patent Images
1. A method of electrophotography characterized:
- in that an electrostatic latent image is formed on the surface of a substance layer;
in that said electrostatic latent image is developed by a magnetic brush method using semiconductive ferrite carriers and triboeletric magnetic toner with a chargeability to provide the magnetic brush, the ferrite carriers having a saturated magnetization of 20 to 90 emu/g and the magnetic toner having an intrinsic volume resistance exceeding 1014 Ω
·
cm when an electric field of a direct current of 4,000 V/cm is applied, with the magnetic brush moving at high speeds and in the same direction relative to the substance layer; and
in that the developed toner image is transferred to a transfer member and then fixed.
1 Assignment
0 Petitions
Accused Products
Abstract
In a method of developing triboelectric magnetic toner, an electrostatic latent image is formed on a substance, the latent image is developed by a magnetic brush method using a ferrite carrier of semiconductivity and a triboelectric magnetic tonor, and the developed toner image is transferred to a transfer member and fixed.
By adding the semiconductive ferrite carrier, a lump of tonor is broken with a mechanical force of the carrier so as to increase the flowability of the tonor and to prevent the agglomeration of the tonor due to dielectric charging.
44 Citations
14 Claims
-
1. A method of electrophotography characterized:
- in that an electrostatic latent image is formed on the surface of a substance layer;
in that said electrostatic latent image is developed by a magnetic brush method using semiconductive ferrite carriers and triboeletric magnetic toner with a chargeability to provide the magnetic brush, the ferrite carriers having a saturated magnetization of 20 to 90 emu/g and the magnetic toner having an intrinsic volume resistance exceeding 1014 Ω
·
cm when an electric field of a direct current of 4,000 V/cm is applied, with the magnetic brush moving at high speeds and in the same direction relative to the substance layer; and
in that the developed toner image is transferred to a transfer member and then fixed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- in that an electrostatic latent image is formed on the surface of a substance layer;
Specification