FIXING HEATER CONTROLLING METHOD AND AN IMAGE FORMING DEVICE

Title:

FIXING HEATER CONTROLLING METHOD AND AN IMAGE FORMING DEVICE

Document Type and Number:

WIPO Patent Application WO/1999/014639

Kind Code:

A1

Abstract:

The fixing heater controlling method has three periods immediately after an AC power-supply voltage begins to be applied to the fixing heater when a heater temperature falls below a target temperature: a first period for controlling only a first heater; a second period for controlling only a second heater following the first period; and a third period for controlling the first and second heaters following the second period. During the first and second periods, the first or second heater is thinning-controlled. At this time, at a cycle of 3 half-waves of the AC voltage applied to the fixing heater, a thinning frequency is changed from a large value to a smaller one. During the third period, first and second sub periods are alternately repeated. In at least one of the first and second sub periods, the first and second heaters are thinning-controlled and the relation of the thinning controls of the two heaters is such that they are complementary to each other on the time axis.

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Inventors:

NISHIDA YOSHIAKI (JP)
SUZUKI YASUHIRO (JP)

Application Number:

PCT/JP1998/004202

Publication Date:

March 25, 1999

Filing Date:

September 18, 1998

Export Citation:

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Assignee:

COPYER CO (JP)
NISHIDA YOSHIAKI (JP)
SUZUKI YASUHIRO (JP)

International Classes:

G03G15/20; G05D23/19; (IPC1-7): G03G15/20

Foreign References:

JPS63280281A	1988-11-17
JPS63280283A	1988-11-17
JPH0980961A	1997-03-28
JPH02146074A	1990-06-05
JPH0764437A	1995-03-10
JPH0736234A	1995-02-07
JPH07114294A	1995-05-02

Other References: