Heating apparatus

Details Heating apparatus Heating apparatus

1996-09-04

1998-05-12

Smith, Matthew S.

Electrophotography

Image formation

Fixing

219619, 219671, G03G 1520

Patent

active

057521506

ABSTRACT:
The induction-heating apparatus of this invention contains a conductive member, a power source, and a first and a second induction coil connected to the power source and adapted for causing the conductive member to generate an induced current, the first and the second induction coil being parallelly connected. The induction coil is formed by winding a copper wire round a core in such a manner that the numbers of turns of the copper wire gradually decrease from the lowermost layer approximating most closely to the core to the upper layers. This heating apparatus has the thickness of the induction coil in the range of 0.2-0.8 mm. The gap between the induction coil and the conductive member is in the range of 0.5-4.0 mm. This heating apparatus has the induction coil thrust out of the conductive member. The induction coil is formed of a Litz wire.

REFERENCES:
patent: 4570044 (1986-02-01), Kobayashi et al.
patent: 5074019 (1991-12-01), Link
patent: 5526103 (1996-06-01), Kato et al.
patent: 5552582 (1996-09-01), Abe et al.
patent: 5568240 (1996-10-01), Ohtsuka

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