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Patent Searching and Data


Title:
IMAGE FORMING APPARATUS AND MAGNETIC DEVELOPER FOR THE SAME
Document Type and Number:
Japanese Patent JP2002214887
Kind Code:
A
Abstract:

To provide a cleanerless type image forming apparatus capable of maintaining a stable electrifying performance and a stable image performance, even over long use.

For the image forming apparatus provided with a magnetic single-component non-contact type developing unit 3 for visualizing an electrostatic latent image by magnetic developer 3a and recovering toner remaining on an charged body, and the charging member of an charge 2 is constituted of a roller type elastic body 2b, the surface of the charging member has a speed difference in the direction opposite to the surface of the charged body, and at least conductive particles exist on the surface, where the charging member comes into contact with the charged body, the speed difference is controlled to be -101% to -40%, the surface roughness Ra of the charge roller is 1 to 500 μm, the contact angle of the surface of the charged body with water is 86° to 103°, and the magnetic developer includes the toner provided with at least binding resin and a magnetic body, and the average circularity of the magnetic developer is ≥0.950.


Inventors:
ISHIYAMA HARUMI
KONO YASUNORI
HIRABAYASHI JUN
TAKAHASHI NORIO
Application Number:
JP2001013975A
Publication Date:
July 31, 2002
Filing Date:
January 23, 2001
Export Citation:
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Assignee:
CANON KK
International Classes:
G03G5/147; G03G9/08; G03G9/083; G03G9/097; G03G13/02; G03G15/02; G03G15/08; (IPC1-7): G03G15/02; G03G5/147; G03G9/08; G03G9/083; G03G15/08
Attorney, Agent or Firm:
Keisuke Watanabe (1 person outside)