Matsushita Electric Industrial Co., Ltd.

Shouichi Kitagawa

Masahiro Samei

Keiichi Matsuzaki

Kenji Asakura

Hideki Tatematsu

Kazunori Matsuo

Tadafumi Shimizu

Tadayuki Kajiwara

Kazuhiko Soeda

Yuichi Monda

Eiji Torikai

In a fixing unit, a medium introducing portis provided near a gripping partof a housing, and a sheet materialto be subjected to a fixing process is guided to the medium introducing port. A shutteris provided slanted at a given angle with respect to a gripping surfaceof the gripping partof the fixing unitsuch that the shutter has a fulcrum at a part thereof, which is closer to the gripping partof the fixing unit, at the medium introducing port, and the shutteris turnable to a position to close the medium introducing portwhile resisting the urging forces of the twisted springs

Image forming apparatus having a removable fixing device

A fixing device is formed by using a heat generating roller having magnetism and electric conductive characteristics and a magnetizing coil opposed to the outer peripheral of the heat generating roller and generating heat on the heat generating roller by an electromagnetic induction. The magnetizing coil is formed in such a manner that 60 copper wires whose surfaces are insulated and have the outside diameter of 0.2 mm are bundled to form a bundle of wires and the bundle of wires is drawn in the direction of rotation axis of the heat generating roller and wound in the direction of a circumference of the heat generating roller. Further, the magnetizing coil is disposed so that the bundles of wires mutually come into close contact along the circumference of the heat generating roller to cover the upper half of the heat generating roller.

Fixing device and image forming apparatus using the same

A heating device utilizing electromagnetic induction is provided with an induction heating unit that is opposed to a heating member and causes the heating member to heat through electromagnetic induction. The induction heating unit has an exciting coil for generating a magnetic field and a coil guide member on which the exciting coil is wound. The exciting coil is formed in at least two layers in such a manner that a first layer is formed on a circumferential surface of the coil guide member by winding a plurality of turns and a second layer is formed around and outside the first layer on the side opposite to the coil guide member, and winding of each of the second layer and following layers is started from a position close to a winding start position of the first layer.

Heating device and fuser utilizing electromagnetic induction

A short ring is provided outside a support frame. In the short ring, eddy current is generated in such a direction as to cancel apart of a magnetic flux developed from the exciting coil when it is fed with current, which the part of the magnetic flux leaks to outside. When the eddy current is generated, a magnetic field is developed in such a direction as to cancel the magnetic field by the leaking flux, as taught by Fleming's law. The result is that unnecessary radiation by the leaking flux is prevented, and hence noise generation in other members or devices is suppressed.

Heating device using electromagnetic induction and fuser

An image heating apparatus and heat generating rotary member for use in the image heating apparatus has a fixing roller including a magnetic metal layer and a non-magnetic metal layer, and the non-magnetic metal layer is provided on the outer side of the magnetic metal layer and is thinner than the magnetic metal layer.

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Fukuoka, Japan

Shouichi Kitagawa