Model for a mono-component development process using edge enhancement effects of floating electrodes [electrophotography]

The contributions of the electrostatic and magnetic fields to the development characteristics of a monocomponent development system are analyzed. This development system uses a special development roller which comprises a development sleeve and a magnetic roller rotating at high speed. The analysis indicates that the magnetic field has a significant effect only on the toner particles which are charged below a certain level. The effect of the magnetic field on the toner particles, which are normally charged above a predetermined level, is negligible. The analysis of the magnetic field indicates that the presently used magnet roller, which rotates at high speed, can be replaced by a micropitch magnet roller, which rotates at low speed. The analysis also indicates that if the quality of the electric charge on the toner particles can be controlled, and that a nonmagnetic toner can also be used in the present development system