JP2000035724A5 - - Google Patents

Description

0012
[Means for solving problems]
In order to solve the above problems, the present invention includes a heat-generating member made of a magnetic layer whose curry temperature is at least partially set, and an exciting member which faces the heat-generating member and excites the heat-generating member with an alternating magnetic field. It has a nip forming means for forming a nip for sandwiching and transporting a material to be recorded carrying a toner image and heating by the heat of the heat generating member, and the heat generating member generates a calorific value when it stabilizes at a curry temperature or higher. An image heating device, which is a heat generating member configured to be smaller than the amount of heat escaping from the heat generating member in the vicinity of the Curie temperature when the device is operated, and an image forming device using the image heating device. Further, in the present invention, at least a part of the heat-generating member made of a magnetic layer set to a predetermined Curie temperature, an exciting member facing the heat-generating member and exciting the heat-generating member with an alternating magnetic field, and a subject carrying a toner image. It has a nip forming means for forming a nip for sandwiching and transporting a recording material and heating it by the heat of the heat generating member, and the heat generating member has a heat generation amount at room temperature or higher when excited. An image heating device, which is a heat generating member configured so that the amount of heat generated is halved or less, and an image forming device using the image heating device.

Claims (16)

At least a part of the heat generating member made of a magnetic layer set at a predetermined Curie temperature, an exciting member that opposes the heat generating member with an alternating magnetic field, and a recording material carrying a toner image are sandwiched and conveyed. Nip forming means for forming a nip for heating by the heat of the heat generating member, and the heat generation amount when the heat generating member stabilizes above the Curie temperature is from the heat generating member near the Curie temperature during operation of the apparatus. An image heating apparatus which is a heat generating member configured to be smaller than an amount of heat to escape. At least a part of the heat generating member made of a magnetic layer set at a predetermined Curie temperature, an exciting member that opposes the heat generating member with an alternating magnetic field, and a recording material carrying a toner image are sandwiched and conveyed. Nip forming means for forming a nip for heating by the heat of the heat generating member, and the heat generating member has a heat generation amount equal to or higher than the Curie temperature for 2 minutes with respect to the heat generation amount at normal temperature when excited. An image heating apparatus, wherein the image heating apparatus is a heat generating member configured to be 1 or less. The image heating apparatus according to claim 1 or 2 , wherein the thickness of the magnetic layer is twice or more the skin depth. At least a part of the heat generating member composed of a magnetic layer set at a predetermined Curie temperature and a conductive layer having a lower resistance than the magnetic layer adjacent to the magnetic layer, and excitation that opposes the heat generating member with an alternating magnetic field And a nip forming means for forming a nip for nipping and conveying a recording material carrying a toner image and heating the recording material by heat of the heat generating member. An image heating apparatus characterized by being a heat generating member configured such that a heat generation amount at a temperature equal to or higher than the Curie temperature is less than a half of a heat generation amount. 5. The image heating apparatus according to claim 4, wherein the magnetic layer has a relationship of ρ1 / t1 ≧ ρ2 / t2, where ρ1 and t1 are the specific resistance and thickness of the magnetic layer, and ρ2 and t2 are the specific resistance and thickness of the conductive layer, respectively. 6. An image heating apparatus according to claim 4 , wherein the thickness of the magnetic layer is equal to or greater than the skin depth. A heating member made of a magnetic layer at least partially set to a predetermined Curie temperature, an exciting member that opposes the heating member with an alternating magnetic field, and a recording material carrying a toner image are sandwiched and conveyed. Nip forming means for forming a nip for heating by the heat of the heat generating member, and the Curie temperature is reduced by the relative permeability of the magnetic body near the Curie temperature during operation of the apparatus. The image heating is characterized in that the temperature at which the member is stabilized is higher than the cold offset start temperature of the toner, and the temperature at the nip outlet at the time of stabilization is lower than the hot offset start temperature of the toner. apparatus. A heat generating member comprising at least a part of a magnetic layer set at a predetermined Curie temperature and a conductive layer having a lower resistance than the magnetic layer adjacent to the magnetic layer, and excitation that opposes the heat generating member with an alternating magnetic field. And a nip forming means for forming a nip for nipping and conveying a recording material carrying a toner image and heating the recording material by heat of the heat generating member. Due to a decrease in the relative permeability of the magnetic material near the temperature, the temperature at which the heat generating member is stabilized is higher than the cold offset start temperature of the toner, and the temperature at the nip outlet at that time is lower than the hot offset start temperature of the toner. An image heating apparatus which is set so as to be. When the cold offset start temperature of the toner at the nip is Tc degree C, the Curie temperature is Tk degree C, and the hot offset start temperature of the toner at the nip outlet is Th degree C, the Curie temperature has a relationship of Tc ≦ Tk ≦ Th + 70. The image heating apparatus according to claim 7 or 8, wherein is set. The image heating apparatus according to claim 7 or 8, wherein the Curie temperature Tk degree C is set such that 140≤Tk≤280. An apparatus according to any one of at least a portion of the nip forming unit the heating member, claims 1 consisting of a pressurizing means for this pressing contact 10. The image heating apparatus according to claim 11 , wherein at least the magnetic layer of the heat generating member is a roller. The image heating apparatus according to claim 11 , wherein at least the magnetic layer of the heat generating member is an endless film. The image heating apparatus according to claim 11 , wherein at least the conductive layer of the heat generating member is an endless film. An apparatus according to any one of the endless film nip forming means proximate to the heating member, claims 1 consisting of a pressure means for pressing contact with the film 10. 16. An image forming apparatus comprising: an image forming unit that forms and supports an unfixed image on a recording material; and a thermal fixing device that thermally fixes the unfixed image to the recording material, wherein the thermal fixing device is any one of claims 1 to 15 . An image forming apparatus according to claim 1.