Developing unit for an image forming apparatus having a magnetic

Details Developing unit for an image forming apparatus having a magnetic Developing unit for an image forming apparatus having a magnetic

1998-04-17

1999-09-14

Smith, Matthew S.

Electrophotography

Image formation

Development

399256, 399272, G03G 1509

Patent

active

059535687

ABSTRACT:
A developing unit of the present invention includes a developing roller facing a photoconductive element and formed with a magnetic layer on its circumference. The magnetic layer has a plurality of magnetic poles of opposite polarities alternating with each other and each extending in the axial direction of the developing roller. A developer consisting of magnetic particles an toner are deposited on the developing roller by the magnetic poles and conveyed by the roller to the photoconductive element carrying a latent image thereon, thereby developing the latent image. An agitator for agitating the magnetic particles and toner is positioned relative to the developing roller such that a blade thereof has an agitation range overlapping with the magnetic force range of the magnet layer. With this configuration, it is possible to insure high quality images free from background contamination and toner scattering while extending the service life of the developing unit.

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patent: 5832350 (1998-11-01), Kumasaka

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