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US 5,262,834 AGranted
Image fixing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKensaku Kusaka, Shigeo Kimura, Atsushi Hosoi, Hiroyuki Adachi, Hidekazu Maruta, Akira Yamamoto
Life of this patent
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Abstract
An image fixing apparatus includes a heater; a film movable while being in contact with a recording material carrying a toner image, wherein the toner image is heated by heat from the heater through the film; wherein the film and the recording material are separated when a temperature of the toner image is lower than a maximum temperature provided by the heater and is higher than a glass transition point of the toner.
Claims35
An image fixing apparatus, comprising:
- a heater which is stationary during a fixing operation, said heater including a thermally conductive base plate and a heat generating resistor on said base plate, said resistor generating heat upon electric power supply thereto;
- a heat insulating member for supporting said base plate;
- a film in sliding contact with said heater and movable with a recording material carrying a toner image, wherein the toner image is heated by heat from said heater through said film;
- wherein said film and the recording material are separated when a temperature of the toner image is higher than a glass transition point of the toner, and wherein said film is separated form said recording material by being guided by said heat insulating member at a position downstream of said base plate with respect to a movement direction of said film.
1 more element
An image fixing apparatus, comprising:
- a heater;
- a film movable while in contact with a recording material carrying a toner image, wherein the toner image is heated by heat from said heater through said film, said film having a plurality of layers, wherein at least one of the layers is a heat-resistive base layer, and a layer contactable with the toner image is a releasing layer;
- wherein said film and the recording material are separated when a temperature of the toner image is lower than a maximum temperature provided by the heater and is higher than a glass transition point of the toner.
An image fixing apparatus, comprising:
- a heater;
- a film movable while in contact with a recording material carrying a toner image, wherein the toner image is heated by heat from said heater through said film, said film including a plurality of layers, wherein at least one of the layers is a heat-resistive base layer, and at least a surface layer contactable to the toner image is a low resistance layer;
- wherein said film and the recording material are separated when a temperature of the toner image is lower than a maximum temperature provided by the heater and is higher than a glass transition point of the toner.
An image fixing apparatus, comprising:
- a heater;
- a film movable while in contact with a recording material carrying a toner image, wherein the toner image is heated by heat from said heater through said film, said film is in the form of an endless belt;
- wherein said film and the recording material are separated when a temperature of the toner image is lower than a maximum temperature of the toner image is lower than a maximum temperature provided by the heater and is higher than a glass transition point of the toner.
An image fixing apparatus, comprising:
- a heater;
- a film movable while in contact with a recording material carrying a toner image, wherein the toner image is heated by heat from said heater through said film;
- wherein said film and the recording material are separated when a temperature of the toner image is lower than a maximum temperature provided by the heater and is higher than a glass transition point of the toner, the maximum temperature is within a range in which a high temperature toner offset occurs.
An image fixing apparatus, comprising:
- a heater which is fixed during fixing operation of said fixing apparatus, and including a heat generating resistor generating heat upon electric energization;
- a film movable in contact with the recording material, said recording material carrying a toner image, wherein the toner image is heated by heat from said heat generating resistor through said film;
- wherein said film and the recording material are separated at a position downstream of said heat generating resistor with respect to as movement direction of said film;
- and wherein a temperature of the toner image is decreased between said heat generating resistor and a position where said film and the recording material are separated, and a temperature of the toner is higher than a glass transition point of the toner at the separating position.
1 more element
Dependencies are inferred from the claim text.