Fixing Device and Image Forming Apparatus
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United States of America Patent
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N/A
Issued Date -
Aug 27, 2009
app pub date -
Feb 13, 2009
filing date -
Feb 26, 2008
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A fixing device has: (a) an electromagnetic coil placed with a gap from a member of a magnetic material to be heated; a switching device that supplies electronic power to the electromagnetic coil; (b) a switching control unit that controls duty ratio for the switching device under a condition that a load voltage and a load current of the switching device are substantially zero when the switching device is turned on and/or off; (c) a shield member capable of being placed between the electromagnetic coil and the member to be heated to shield the member to be heated against a magnetic flux from the electromagnetic coil; and (d) a shield control unit that controls a shield amount of the shield member by moving either the shield member or both the electromagnetic coil and the member to be heated.
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