Developing unit
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United States of America Patent
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-
Jun 25, 1996
Grant Date -
N/A
app pub date -
Sep 20, 1995
filing date -
Mar 23, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A developing roll includes a tubular sleeve driven for turn, and a magnet roll fixedly supported. An intensively magnetized block, shaped like U in cross section, is buried in the magnet roll at a location thereof where the magnet roll faces the latent electrostatic image bearing member. In this case, one side of the intensively magnetized block having a groove formed therein is directed toward the axis of the magnet roll, while the other side thereof is flush with the outer surface of the magnet roll. A material of the intensively magnetized block is more intensively magnetized, by its nature, than a material of the magnet roll. The intensively magnetized block is magnetized to form a single magnetic pole or a developing magnetic pole.
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