Electrophotography – Control of electrophotography process – Control of fixing
Patent
1999-02-11
2000-10-24
Chen, Sophia S.
Electrophotography
Control of electrophotography process
Control of fixing
219216, 399333, 399334, G03G 1520
Patent
active
061379697
ABSTRACT:
A thermal fixing device for thermally fixing an unfixed image carried on a record medium onto the record medium, including: a thermal fixing roller including a first resistance heating material layer (e.g., the resistance heating material layer also serving as a core roller) and a second resistance heating material layer; a power source circuit capable of forming a first circuit for energizing only the first resistance heating material layer and a second circuit for energizing the first and second resistance heating material layers by connecting them in parallel; and a controller for controlling energizing of each of the resistance heating material layers by the power source circuit, wherein the controller controls the power source circuit such that only the first resistance heating material layer is energized until a predetermined time elapses after start of the temperature rising of the thermal fixing roller, and the first and second resistance heating material layers are connected in parallel and energized after elapsing of the predetermined time.
REFERENCES:
patent: 4801968 (1989-01-01), Kogure et al.
patent: 5822670 (1998-10-01), Morigami
patent: 5906762 (1999-05-01), Okabayashi
Chen Sophia S.
Minolta Co. , Ltd.
Tran Hoan
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