Developing apparatus
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United States of America Patent
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Oct 25, 1994
Grant Date -
N/A
app pub date -
Aug 25, 1993
filing date -
Aug 28, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A developing apparatus for developing an electrostatic latent image formed on an image bearing member includes a developer carrying member for carrying a developer containing toner particles and magnetic carrier particles. The developer carrying member moves through a developing zone for applying the developer to the electrostatic latent image. A stationary magnet assembly is disposed in the developer carrying member. The magnet assembly comprises a rare earth magnet having a first magnetic pole for forming a magnetic field in the developing zone and a resin magnet having a second magnetic pole disposed adjacent to the first magnetic pole downstream of the first magnetic pole with respect to a movement direction of the developer carrying member, wherein a maximum magnetic flux density on a developer carrying member provided by the first magnetic pole is larger than a maximum magnetic flux density on the developer carrying member by the resin magnet.
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