Title:
ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER AND MULTICOLOR IMAGE FORMING METHOD USING THE SAME
Document Type and Number:
Japanese Patent JP3486707
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To form full-color images having high image quality and to obtain developers having high reliability by constituting the toner developers of specific color toners and black toners.
SOLUTION: This developer is the plural toner developers used for a color copying machine. The toner developers are composed of the color toners having Wadells operational sphericity ψ of ≥0.8, volumetric average rain size Dv of 4 to 8μm and a fluctuation coefft. (standard deviation/Dv) σ of ≤35% and the black toners having the Wadells operational sphericity smaller than the Wadells operational sphericity of all of these color toners and the large volumetric average grain size. In such a case, the sphericity ψ is expressed by ψ = (the diameter of the circle of an area equal to the projection area of particles)/(the diameter of the min. circle circumscribing the projected image of the particles) and may be easily calculated by taking a suitable amt. of the toners on sliding glass, magnifying the images thereof with a microscope and making measurement with arbitrary 100 pieces of the toners.
Inventors:
Hiroaki Matsuda
Yoichiro Watanabe
Kimitoshi Yamaguchi
Akemi Sugiyama
Yoichiro Watanabe
Kimitoshi Yamaguchi
Akemi Sugiyama
Application Number:
JP9335396A
Publication Date:
January 13, 2004
Filing Date:
March 22, 1996
Export Citation:
Assignee:
株式会社リコー
International Classes:
G03G9/08; G03G9/087; G03G9/09; G03G9/113; G03G15/01; (IPC1-7): G03G9/08; G03G9/087; G03G9/09; G03G9/113; G03G15/01
Domestic Patent References:
| JP815979A | ||||
| JP7209952A | ||||
| JP7146589A | ||||
| JP7140723A | ||||
| JP6236073A | ||||
| JP6180512A |
Attorney, Agent or Firm:
Toshiaki Ikeura (1 outside)