JP2001250670A5 - Induction heating apparatus, fixing apparatus and full color image forming apparatus - Google Patents

Description

In this case, the material to be heated can be reliably and uniformly heated by pressing the material to be heated against the heating member by the pressurizing means.
An induction heating apparatus according to the present invention comprises a first roller and a second roller arranged in close proximity to each other, an endless heating belt wound around these rollers and given a predetermined tension, and The heating device is arranged along a periphery of a portion of the heating belt wound around at least the two rollers, and pressing means pressing against the portion of the heating belt wound around the one roller to form a nip portion. And a magnetic field generating means for heating the heating belt.
The induction heating apparatus according to the present invention also includes a first roller and a second roller arranged in close proximity to each other, and an endless heating belt wound around these rollers and given a predetermined tension. A pressure means pressing against a portion of the heating belt wound around the first roller to form a nip portion, a portion of the heating belt wound around the two rollers, and a heating belt between them And a magnetic field generating means for heating the heating belt.
In the induction heating apparatus of the present invention, for example, the heating belt has at least one conductive layer that generates heat in a fluctuating magnetic field, and a release layer is formed on the surface.
In the induction heating device of the present invention, for example, the two rollers have a conductive layer on the surface that generates heat in a fluctuating magnetic field.
The fixing device according to the present invention is characterized in that any one of the above four induction heating devices is provided.
An image forming apparatus according to the present invention includes the above-described fixing device.
A full color image forming apparatus according to the present invention comprises a visible image forming unit for forming four color full color toner visible images on a recording sheet, and fixing the four color full color toner visible images on the recording sheet. An endless heating belt having a first roller and a second roller arranged in close proximity to each other, and a predetermined tension applied to the rollers. A pressure means for pressing the portion of the heating belt wound around the first roller to form a nip portion, and at least an outer periphery of the portion of the heating belt wound around the second roller And a magnetic field generating means arranged along the same for heating the heating belt.
In the full color image forming apparatus of the present invention, for example, the heating belt has at least one conductive layer that generates heat in a fluctuating magnetic field, and a release layer is formed on the surface.
In the full color image forming apparatus of the present invention, for example, at least the second roller has a conductive layer on the surface that generates heat in a fluctuating magnetic field .

Claims (21)

  A plurality of sets of induction coils consisting of linear portions extending in a first direction and connection portions connecting the ends of the linear portions are provided in a second direction intersecting the first direction and connected in series An induction heating apparatus comprising the coil unit according to claim 1.   The induction heating apparatus according to claim 1, wherein the plurality of induction coils are arranged at a predetermined interval in a second direction.   The induction heating apparatus according to claim 1, wherein the plurality of induction coils are arranged closely in the second direction. A heating member for heating a material to be heated which has a conductive layer generating heat in a fluctuating magnetic field and is moving in a direction orthogonal to the width direction, and for heating the heating member which is disposed outside the heating member An induction heating apparatus comprising:
An induction heating apparatus characterized in that the magnetic field generating means is composed of a plurality of magnetic field generating parts connected in series with each other.   Each of the magnetic field generating parts is an induction coil comprising a linear portion extending in the width direction of the material to be heated and a connection portion connecting the ends of the linear portion, and the plurality of induction coils are the heating member 5. The induction heating apparatus according to claim 4, wherein the induction heating apparatus is arranged in a direction corresponding to the movement direction of the material.   The induction heating apparatus according to claim 5, wherein the plurality of induction coils are arranged at predetermined intervals in a direction corresponding to the movement direction of the material to be heated.   The induction heating apparatus according to claim 5, wherein the plurality of induction coils are arranged in proximity to a direction corresponding to the movement direction of the material to be heated.   The induction heating apparatus according to any one of claims 4 to 7, wherein the heating member comprises a heating roller, and the magnetic field generating means is arranged along the outer periphery of the heating roller.   8. The apparatus according to claim 4, wherein said heating member comprises an endless heating belt wound around a plurality of rollers, and said magnetic field generating means is arranged along the outer circumference of said heating belt. An induction heating device according to any one of the items.   At least one of the rollers has a conductive layer which generates heat in a fluctuating magnetic field, and a part of the magnetic field generating means is arranged along the outer periphery of the belt wound around the roller having a conductive layer 10. The induction heating apparatus of claim 9, wherein:   The plurality of rollers are two rollers arranged in proximity to each other, and each of the rollers has a conductive layer which generates heat in a fluctuating magnetic field, and the magnetic field generating means is wound around the two rollers. 10. The induction heating apparatus according to claim 9, wherein the induction heating apparatus is arranged along the outer periphery of the applied part and the part between them.   The apparatus according to any one of claims 4 to 11, further comprising pressing means for pressing the material to be heated against the heating member in order to transfer the heat of the heating member to the material to be heated. Heating device. A first roller and a second roller arranged in close proximity to each other, an endless heating belt wound around these rollers and having a predetermined tension applied thereto, and a roller wound around the first roller Pressure means arranged in pressure contact with the portion of the heating belt to form a nip portion, and arranged along the outer periphery of the portion of the heating belt wound around at least the two rollers for heating the heating belt An induction heating apparatus comprising: a magnetic field generating means . A first roller and a second roller arranged in close proximity to each other, an endless heating belt wound around these rollers and having a predetermined tension applied thereto, and a roller wound around the first roller It is arranged along the outer periphery of a portion of the heating belt wound around the two rollers and a portion of the heating belt between them, pressing means pressing against the portion of the heating belt to form a nip portion. An induction heating apparatus comprising: magnetic field generating means for heating the heating belt . The induction heating apparatus according to claim 13 or 14, wherein the heating belt has at least one conductive layer which generates heat in a fluctuating magnetic field, and a release layer is formed on the surface . The induction heating apparatus according to claim 13 or 14, wherein the two rollers have a conductive layer on the surface that generates heat in a fluctuating magnetic field . A fixing device comprising the induction heating device according to any one of claims 13 to 16 . An image forming apparatus comprising the fixing device according to claim 17 . A visible image forming unit for forming four full color toner visible images on a recording sheet; and a fixing device for fixing the four full color toner visible images on the recording sheet.
The fixing device includes a first roller and a second roller arranged close to each other, an endless heating belt wound around these rollers and having a predetermined tension applied thereto, and the first roller Pressure means for pressing the portion of the heating belt wound around to form a nip portion, and at least the heating means arranged along the outer periphery of the portion of the heating belt wound around the second roller What is claimed is: 1. A full color image forming apparatus comprising: magnetic field generating means for heating a belt . 20. A full color image forming apparatus according to claim 19, wherein said heating belt has at least one conductive layer that generates heat in a fluctuating magnetic field, and a release layer is formed on the surface . 20. A full color image forming apparatus according to claim 19, wherein at least said second roller has a conductive layer on its surface that generates heat in a fluctuating magnetic field .