Electrophotography – Image formation – Fixing
Patent
1997-06-26
1998-10-06
Brase, Sandra L.
Electrophotography
Image formation
Fixing
399335, G03G 1520
Patent
active
058191500
ABSTRACT:
An image heating apparatus is constructed by a heat generating member having a conductive layer and a magnetic field generating apparatus for generating a magnetic field. The magnetic field generating apparatus has an exciting coil and an electric power is supplied from a power source to the exciting coil by a switching circuit. An eddy current is generated in the heating member by the magnetic field generated by the magnetic field generating apparatus, the heat generating member generates a heat by the eddy current, and an image on a recording material is heated by the heat. The exciting coil has a first coil portion and a second coil portion for matching the impedances of the first coil portion and the heat generating member. The first coil portion and the second coil portion are neighboring. The magnetic coupling between the second coil portion and the heat generating member is weaker than that between the first coil portion and the heat generating member. The second coil portion is away from the heat generating member than the first coil portion. The first coil portion and the second coil portion are serially connected. The number of turns of the second coil portion is smaller than that of the first coil portion.
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patent: 5666627 (1997-09-01), Yamaguchi
Patent Abstracts of Japan, vol. 096, No. 006, 28 Jun. 1996, & JP 08-044226 (Canon Inc.), 16 Feb. 1996.
U.S. application No. 08/687,781, Abe et al. filed Jul. 1996, Assignee, Canon Kabushiki Kaisha.
Abe Atsuyoshi
Hayasaki Minoru
Mano Hiroshi
Nakane Kiyofumi
Brase Sandra L.
Canon Kabushiki Kaisha
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