Burns, Doane, Swecker & Mathis
Developer having the predetermined residual polarization and developing apparatus for using the developer
 A developing apparatus includes: an electrostatic latent image holding member for holding an electrostatic latent image; an accommodating device for accommodating therein developer of residual polarization of 0.1-20 .mu.C/cm.sup.2 ; an electric field developing device arranged in the accomodating device, the developer being polarized by action of an electric field force developed by the electric field developing device; and a transporting device for transporting the polarized developer too the holding member to develop the electrostatic latent image on the holding member by the developoer. An unequal alternating electric field is able to be developed by the electric field developing device to apply the electric field curtain force on the developer. The electric field developing device comprises at least two electrodes electrically insulated from each other and an applying device for applying an alternating voltage on the two electrodes. An alternating voltage with a peak-to-peak voltage of 200V-6KV and a frequency of tens -tens KHz is applied on the electrodes by the applying device. The developer comprises ferroelectric powder and organic binder. The developer has an average grain diameter of 2-20 .mu.m. The powder has an average grain diameter of 0.02-5.0 .mu. m and the developer comprises 0.1-50 wt% of the powder. 
Minolta Camera Kabushiki Kaisha
G G
G03G G03G
inventional inventional
Masahiro Hiroshi Hideo Yoshihisa
Anno Mizuno Hotomi Terasaka