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US 5,499,087 AGranted
Heat fixing device and electrophotographic apparatus incorporating the same having a PTC heating element received in a recess of a holder
AssigneesHitachi, Ltd., Ube Industries, Ltd., Hitachi Koki Co., Ltd.
InventorsChikara Hiraoka, Junichi Matsuno, Masao Mitani, Hiroshi Oda, Toshikazu Tsumura
Life of this patent
Estimating the term…
Abstract
A heat fixing device includes a heating head formed by attaching a radiant plate to the radiant surface of a PTC heating element using an adhesive having an excellent thermal conductivity, and embedding a heating unit, of which surfaces except the radiant surface are shielded with an adiabatic material, in a recess formed in a holder for supporting the heating unit.
Claims23
A heating fixing device, comprising:
- an endless heat resistant belt;
- a driving roller for rotating said heat resistant belt;
- and
- a holder contactable with said heat resistant belt and having a recess;
- and
- a PTC heating element having a positive temperature coefficient characteristic and received in the recess in said holder with an elastic member interposed therebetween.
3 more elements
A heat fixing device, comprising:
- an endless heat resistant belt;
- a driving roller for rotating said heat resistant belt;
- and
- a holder contactable with said heat resistant belt and having a recess;
- a PTC heating element having a positive temperature coefficient characteristic and received in the recess in said holder with a heat-insulating and electrically-insulating member interposed therebetween;
- and
- an elastic member interposed between said heat-insulating and electrically-insulating member and said recess.
4 more elements
A heat fixing device comprising:
- an endless heat resistant belt;
- a driving roller for rotating said heat resistant belt;
- a holder contactable with said heat resistant belt and having a recess;
- and
- a PTC heating element having a positive temperature coefficient characteristic and received in the recess in said holder with a heat-insulating and electrically-insulating member interposed therebetween, wherein said holder is made of an electrically-insulating material.
2 more elements
A heat fixing device, comprising:
- an endless heat resistant belt;
- a driving roller for rotating said heat resistant belt;
- a holder that contacts said heat resistant belt and holds a PTC heating element having a positive temperature coefficient characteristic;
- a radiant plate attached to a radiant surface of said PTC heating element by an adhesive having excellent thermal conductivity, said PTC heating element having a surface other than the one to which said radiant plate is attached, said other surface being coated with an adiabatic and electrically-insulating material, said PTC heating element being received in a recess formed in said holder with an elastic member interposed therebetween;
- and
- a coating of an insulating material having excellent lubricity formed on at least the surface of said radiant plate contacting said heat resistant belt.
3 more elements
An electrophotographic apparatus, comprising:
- a photosensitive drum;
- means for forming an electrostatic latent image on a surface of said photosensitive drum;
- developing means for developing the electrostatic latent image formed on the surface of said photosensitive drum and producing a toner image;
- transfer means for transferring the toner image onto a sheet;
- and
- heating fixing means for fixing the thus transferred toner image onto said sheet;
- said heat fixing means comprising a heat fixing device comprising an endless heat resistant belt, a driving roller for rotating said heat resistant belt, a holder contactable with said heat resistant belt and having a recess, and a PTC heating element having a positive temperature coefficient characteristic and received in the recess in said holder with an elastic member interposed therebetween.
4 more elements
An electrophotographic apparatus, comprising:
- a photosensitive drum;
- means for forming an electrostatic latent image on a surface of said photosensitive drum;
- developing means for developing the electrostatic latent image formed on the surface of said photosensitive drum and producing a toner image;
- transfer means for transferring the toner image onto a sheet;
- and
- heating fixing means for fixing the thus transferred toner image onto said sheet;
- said heat fixing means comprising a heat fixing device comprising an endless heat resistant belt, a driving roller for rotating said heat resistant belt, a holder contactable with said heat resistant belt and having a recess, a PTC heating element having a positive temperature coefficient characteristic and received in the recess in said holder with a heat-insulating and electrically-insulating member interposed therebetween, and an elastic member interposed between said heat-insulating and electrically-insulating member and said recess.
4 more elements
An electrophotographic apparatus, comprising:
- a photosensitive drum;
- means for forming an electrostatic latent image on a surface of said photosensitive drum;
- developing means for developing the electrostatic latent image formed on the surface of said photosensitive drum and producing a toner image;
- transfer means for transferring the toner image onto a sheet;
- and
- heating fixing means for fixing the thus transferred toner image onto said sheet;
- said heat fixing means comprising a heat fixing device comprising an endless heat resistant belt, a driving roller for rotating said heat resistant belt, a holder that contacts said heat resistant belt and holds a PTC heating element having a positive temperature coefficient characteristic, a radiant plate attached to a radiant surface of said PTC heating element by an adhesive having excellent thermal conductivity, said PTC heating element having a surface other than the one to which said radiant plate is attached, said other surface being coated with an adiabatic and electrically-insulating material, said PTC heating element being received in a recess formed in said holder with an elastic member interposed therebetween, and a coating of an insulating material having excellent lubricity formed on at least the surface of said radiant plate contacting said heat resistant belt.
4 more elements
Dependencies are inferred from the claim text.