Image forming apparatus

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United States of America Patent

PATENT NO 9250573
APP PUB NO 20150338780A1
SERIAL NO

14718397

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Abstract

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An image forming apparatus includes: a developer carrying member (sleeve) including a magnet and grooves; and an image bearing member (drum). The electrostatic image on the drum is developed with a developer. When a linear speed of the sleeve is Vs, a linear speed of the drum is Vd, a peripheral speed ratio of the sleeve to the drum is α=Vs/Vd, a radius of the sleeve is Rs, a radius of the drum is Rd, a distance of a rectilinear line connecting a most upstream point and a most downstream point in the developing region with respect to the circumferential direction is Lnip, a pitch of the grooves of the sleeve is p, and an arbitrary natural number is n, the following relationship is satisfied:

description='In-line Formulae' end='lead'(1−0.05)×np≦2[α×Rd×arcsin(Lnip/2Rd)−Rs×arcsin(Lnip/2Rs)]≦(1+0.05)×np. description='In-line Formulae' end='tail'

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Matsumoto, Atsushi Toride, JP 371 4805

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