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Title:
ELECTROSTATIC LATENT IMAGE DEVELOPING METHOD
Document Type and Number:
Japanese Patent JP3841341
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a developing method which improves a quality related to the directionality of development which means that the developing sleeve is more rapid than the moving velocity of electrostatic latent image and an abnormal picture quality.
SOLUTION: This electrostatic latent image developing method is a two- component developing method in which the linear velocity ratio of photoreceptor velocity Vp and developing sleeve velocity Vr is 1.2<Vr/Vp<3 and direct current bias VB is applied and, therein, features that a distance of the most approximate part (developing gap Gp) between the photoreceptor and the developing sleeve is ≤0.6 mm, the density ρp of a developer on the most approximate part which is represented as ρp=J/Gp [g/cm3] is ρp/ρa<0.7 when bulk density of the used developer is ρa, and the carriers for electrophotography in which the core material thereof has weight average particle size of ≥25 μm and ≤45 μm, the particles which are smaller than 44 μm is ≥70 wt.%, the particles which are smaller than 22 μm is ≤7 wt.% and the ratio of weight average particle size Dv and number average particle size Dp is 1≤Dv/Dp≤1.30 and the surface of the core material is coated with resin are used.


Inventors:
Yamaguchi Public Interest
Akihiro Koban
Application Number:
JP2002055668A
Publication Date:
November 01, 2006
Filing Date:
March 01, 2002
Export Citation:
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Assignee:
株式会社リコー
International Classes:
G03G9/08; G03G9/107; G03G9/10; G03G9/113; G03G13/09; G03G15/06; (IPC1-7): G03G9/107; G03G9/08; G03G9/113; G03G15/06
Domestic Patent References:
JP8006286A
JP9251239A
JP10232512A
JP2001027828A
Attorney, Agent or Firm:
Hidehiko Takei