EP 0431830 B1 19950419 - Carrier for two-component type developer.
Title (en)
Carrier for two-component type developer.
Title (de)
Träger für Zweikomponentenentwickler.
Title (fr)
Véhiculeur pour développateur à deux composants.
Publication
Application
Priority
- JP 18719890 A 19900717
- JP 30660189 A 19891128
Abstract (en)
[origin: EP0431830A1] Disclosed is a ferrite carrier for a two-component type developer, characterized in that the internal pore ratio, based on the area, of carrier particles is adjusted to 3 to 30%, the electric resistance is adjusted within a certain range, and the developing electric field dependency indicating the change ratio of the electric resistance of the particles caused when the electric field is changed is controlled within a specific range. This carrier has a good durability, and when a two-component developer comprising this ferrite carrier is used, there can be obtained a high-quality image in which a solid image area and a fine line image area are clearly reproduced.
IPC 1-7
IPC 8 full level
G03G 9/10 (2006.01); G03G 9/107 (2006.01)
CPC (source: EP KR US)
G03G 9/1085 (2020.08 - EP KR US)
Designated contracting state (EPC)
CH DE ES FR GB IT LI NL
DOCDB simple family (publication)
EP 0431830 A1 19910612; EP 0431830 B1 19950419; CA 2030910 A1 19910529; DE 69018786 D1 19950524; DE 69018786 T2 19950824; ES 2074141 T3 19950901; JP 2954326 B2 19990927; JP H04174446 A 19920622; KR 910010249 A 19910629; KR 940010599 B1 19941024
DOCDB simple family (application)
EP 90312945 A 19901128; CA 2030910 A 19901127; DE 69018786 T 19901128; ES 90312945 T 19901128; JP 30669890 A 19901113; KR 900019426 A 19901128