KR20160028343A - Heater and image forming apparatus - Google Patents

Heater and image forming apparatus Download PDF

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Publication number
KR20160028343A
KR20160028343A KR1020150076099A KR20150076099A KR20160028343A KR 20160028343 A KR20160028343 A KR 20160028343A KR 1020150076099 A KR1020150076099 A KR 1020150076099A KR 20150076099 A KR20150076099 A KR 20150076099A KR 20160028343 A KR20160028343 A KR 20160028343A
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KR
South Korea
Prior art keywords
resistance heating
pair
heating elements
heater
side direction
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KR1020150076099A
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Korean (ko)
Inventor
겐타로 기무라
마사히코 다마이
아키오 츠보우치
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도시바 라이텍쿠 가부시키가이샤
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Publication of KR20160028343A publication Critical patent/KR20160028343A/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor

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  • Resistance Heating (AREA)
  • Fixing For Electrophotography (AREA)
  • Control Of Resistance Heating (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Surface Heating Bodies (AREA)

Abstract

The present invention provides a heater and an image forming apparatus, capable of suppressing temperature inhomogeneity of a substrate in a long side of a substrate. According to one embodiment of the present invention, the heater (1-1) has a substrate (2), a pair of resistance heating elements (3, 4), conductors (5-7), electrodes (8, 9), and a thermal conductor (10). The resistance heating elements (3, 4) are formed to be extended toward a long side of the substrate (2) while having intervals in the direction of a short side of the substrate (2). The conductors (5-7) are electrically connected to the resistance heating elements (3, 4). The electrodes (8, 9) are electrically connected to the conductors (5, 6). The thermal conductor (10) is disposed between the resistance heating elements (3, 4). In addition, the thermal conductor and the resistance heating elements (3, 4) are made of the same material.

Description

[0001] HEATER AND IMAGE FORMING APPARATUS [0002]

The present invention relates to a heater and an image forming apparatus.

Heaters are installed in electronic devices such as office automation equipment, household electric appliances, and precision manufacturing facilities. The heater can generate a resistance heating element having a strip shape formed on the substrate by the electric power supplied from the power supply electrode and can be used for fixing the toner on a copying machine or a facsimile, have. Each of the heater, the electrode, the conductor and the resistance heating element is formed on the substrate, and the resistance heating element generates heat by the electric power supplied from the electrode.

Japanese Unexamined Patent Application Publication No. 2-65086 Japanese Patent Application Laid-Open No. 7-94260 Japanese Patent Application Laid-Open No. 2009-244867

The heater that heats the resistance heating element formed extending in the direction of the long side of the substrate is heated from the central portion in the long side direction of the substrate and is radiated from both ends in the long side direction of the substrate so that the temperature of the substrate becomes uneven in the long side direction of the substrate there is a problem.

An object of the present invention is to provide a heater and an image forming apparatus capable of suppressing temperature unevenness of a substrate in a long side direction of the substrate.

The heater of the embodiment includes a substrate, a pair of resistance heating elements, a conductor, an electrode, and a heat conductor. The pair of resistance heating elements are formed so as to extend in the longitudinal direction of the substrate with an interval in the short side direction of the substrate. The conductor is electrically connected to the pair of resistance heating elements. The electrode is electrically connected to the conductor. The heat conductor is disposed between the pair of resistance heating elements. Further, the heat conductor is formed of the same material as the pair of resistance heating elements.

According to the present invention, it is possible to provide a heater and an image forming apparatus capable of suppressing temperature unevenness of the substrate in the longitudinal direction of the substrate.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic view showing a heater of a first embodiment. FIG.
Fig. 2 is a schematic diagram showing a first modification of the heater of the first embodiment. Fig.
3 is a schematic diagram showing a second modification of the heater of the first embodiment.
4 is a schematic diagram showing the heater of the second embodiment.
5 is a schematic diagram showing a first modified example of the heater of the second embodiment.
6 is a schematic diagram showing a second modification of the heater of the second embodiment.
7 is an explanatory view showing a fixing device which is an example of use of a heater.
8 is an explanatory view showing an image forming apparatus which is an example of use of a heater.

The heaters 1-1 and 1-4 and the heaters 1-2, 1-3, 1-5 and 1-6 according to the modified embodiments are provided with the substrate 2, a pair of resistance heating elements 3 and 4, conductors 5, 6 and 7, electrodes 8 and 9, and a heat conductor 10. The pair of resistance heating elements 3 and 4 are formed so as to extend in the longitudinal direction of the substrate 2 with an interval in the short side direction of the substrate 2. [ The conductors 5 to 7 are electrically connected to the pair of resistance heating elements 3 and 4. The electrodes 8 and 9 are electrically connected to the conductors 5 and 6. The heat conductor 10 is disposed between the pair of resistance heating elements 3 and 4. Further, the heat conductor 10 is formed of the same material as the pair of resistance heating elements 3, 4.

 In the heaters 1-1 and 1-4 and the heaters 1-2, 1-3, 1-5, and 1-6 in the embodiments described below, the heat conductor 10 has at least two The base layer in contact with the substrate 2 in the thermally conductive layer is formed so as to have the same thickness as the pair of resistance heating elements 3 and 4 The material charge is formed.

In the heater 1-1 according to the embodiment described below and the heaters 1-2 and 1-3 according to the modification, the heat conductor 10 has a pair of resistance heating elements 3 and 4 and a conductor 5 7), respectively.

In the heaters 1-4 and the heaters 1-5 and 1-6 of the modified embodiments, the heat conductor 10 is electrically connected to each of the pair of resistance heating elements 3 and 4 To the conductor (7) connected thereto.

In the heaters 1-1 and 1-4 and the heaters 1-2, 1-3, 1-5, and 1-6 of the modification examples described below, a pair of resistance heating elements (3, 4) and the heat conductor (10) is 0.3 mm or more and 0.5 mm or less.

The image forming apparatus 100 according to the embodiment described below is provided with a heater 1 for heating a medium to be passed therethrough and a pressure roller 203 for pressing the medium at the time of heating, Thereby fixing the toner image adhered to the medium.

[Embodiment 1]

An embodiment will be described with reference to Fig. 1 is a schematic diagram showing a heater according to a first embodiment. 1, the gap between the pair of resistance heating bodies 3 and 4 and the heat conductor 10 is emphasized in the short side direction of the substrate 2. [ In addition, elements having the same reference numerals in the embodiments, each modification, and each drawing are the same elements, and the description thereof is omitted or simplified.

The heater 1-1 of the present embodiment shown in Fig. 1 is mounted on electronic equipment and heats a medium such as paper which passes mainly. The heater 1-1 of the present embodiment is formed such that a pair of resistance heating elements 3 and 4 extend in the longitudinal direction of the substrate 2. [

1, the heater 1-1 includes a substrate 2, a pair of resistance heating elements 3 and 4, conductors 5 to 7, electrodes 8 and 9, a heat conductor 10 ), And an overcoat layer (11). Each of the pair of resistance heating elements 3 and 4, the conductors 5 to 7, the electrodes 8 and 9 and the heat conductor 10 is formed on the substrate 2 by, for example, screen printing or the like .

The substrate 2 is a rectangular flat plate having a width in the long side direction and a width in the short side direction intersecting with the long side direction. The substrate 2 is made of, for example, ceramics such as alumina, glass ceramic, heat-resistant composite material, etc., and has heat resistance and insulation. The substrate 2 is formed to have a thickness corresponding to a space in which the heater 1-1 is mounted (a thickness in a direction perpendicular to the long side direction and the short side direction). The thickness of the substrate 2 is, for example, about 0.5 mm to 1.0 mm. The length in the short side direction of the substrate 2 in the present embodiment is 6.0 mm. Here, the short side direction of the substrate 2 and the heater 1-1 is the same direction, and the short side direction of the substrate 2 and the heater 1-1 is the same direction.

The pair of resistance heating bodies 3 and 4 are formed on the substrate 2 to generate heat by flowing electricity. The pair of resistance heating elements 3 and 4 are formed on the substrate 2 by using a material such as ruthenium oxide (RuO 2 ), graphite, a material containing silver-palladium (Ag-Pd) Screen printing or the like, followed by baking. The pair of resistance heating elements 3 and 4 are arranged in the direction of the long side of the substrate 2 (hereinafter, simply referred to as " long side direction ") with a space in the short side direction (hereinafter simply referred to as "short side direction" As shown in Fig. That is, the pair of resistance heating elements 3 and 4 are arranged apart from each other in the short side direction. Each of the pair of resistance heating elements 3 and 4 in the present embodiment is formed in a strip shape along the long side direction so that the length in the short side direction becomes constant. The pair of resistance heating elements 3 and 4 are located at the same position at one end on the substrate 2 in the long-side direction. One resistance heating body 3 is electrically connected to a conductor 5 to be described later and the other resistance heating body 4 is electrically connected to a conductor 6 to be described later have. In the present embodiment, each of the resistance heating body 3 and the resistance heating body 4 has a design length of 0.8 mm in the short side direction.

The conductors 5 to 7 supply electric power to the pair of resistance heating elements 3 and 4 and are formed on the substrate 2. [ The conductors 5 to 7 are formed, for example, by coating a conductive paste containing silver (Ag) as a main component on a substrate 2 by screen printing or the like and baking it. The conductor 5 is formed so as to extend from one end of the resistance heating body 3 on one side (the other end 2b side of the substrate 2) toward one end 2a in the longitudinal direction of the substrate 2 . The conductor 5 is formed in a strip shape along the long side direction so that the length in the short side direction becomes constant to the length in the short side direction of the resistance heating element 3 of one side. One end of the conductor 5 is electrically connected to the electrode 8 and the other end is electrically connected to the resistance heating body 3 on one side. That is, the conductor 5 is electrically connected to each of the electrode 8 and one of the resistance heating bodies 3, 4 of the pair of resistance heating bodies 3, 4. The conductor 6 is formed so as to extend from one end of the other resistance heating element 4 toward one end 2a of the substrate 2 in the long side direction. The conductor 6 is formed in a strip shape along the long side direction so that the length in the short side direction becomes constant to the length in the short side direction of the other resistance heating element 4. One end of the conductor 6 is electrically connected to the electrode 9 and the other end is electrically connected to the other resistance heating element 4. [ That is, the conductor 6 is electrically connected to each of the electrode 9 and the other resistance heating body 4 of the pair of resistance heating bodies 3 and 4. The conductor 7 is formed so as to extend from the other end of one resistance heating element 3 to the other end of the resistance heating element 4 on the other side. The conductors 7 are formed in a strip shape along the short side direction so that the length in the long side direction is made longer than the length in the short side direction of each of the resistance heating element 3 and the other resistance heating element 4 Respectively. One end of the conductor 7 is electrically connected to the resistance heating body 3 on one side and the other end is electrically connected to the resistance heating body 4 on the other side. That is, the conductor 7 is electrically connected to each of the pair of resistance heating elements 3 and 4.

The electrodes 8 and 9 supply electric power from outside to the conductors 5 and 6 and are formed on the substrate 2. The electrodes 8 and 9 are arranged on the side of the one end 2a of the substrate 2 in the direction of the long side of the substrate 2 with respect to the pair of resistance heating elements 3 and 4. The electrode 8 is electrically connected to the conductor 5 and the electrode 9 is electrically connected to the conductor 6. The electrode 8 and the electrode 9 are electrically connected through the conductor 5, the resistance heating element 3, the conductor 7, the resistance heating element 4 and the conductor 6.

The heat conductor 10 conveys heat from the pair of resistance heating elements 3 and 4 and is formed on the substrate 2. The heat conductor 10 is disposed between the pair of resistance heating elements 3 and 4. The heat conductor 10 is in electrical non-contact with the pair of resistance heating elements 3 and 4 and extends in the long-side direction. The heat conductor (10) is formed in a strip shape along the long side direction so that the length in the short side direction becomes constant. The position of one end of the heat conductor 10 on the substrate 2 in the long side direction is located at the same position as one end on the substrate 2 in the long side direction of the pair of resistance heat generating elements 3 and 4. [ The other end of the heat conductor 10 in the long-side direction is spaced apart from the conductor 7, and is electrically non-contact with the conductor 7. [ That is, the heat conductor 10 is not in electrical contact with each of the pair of resistance heating elements 3 and 4 and the conductors 5 to 7.

The heat conductor 10 in the present embodiment is formed by forming a base layer at the same time as the pair of resistance heating elements 3 and 4, and stacking a plurality of heat conduction layers on the base layer. That is, the heat conductor 10 according to the present embodiment includes a base layer formed simultaneously with the pair of resistance heating elements 3 and 4, and a heat conductive layer stacked on the base layer. The heat conductor 10 including the base layer and the plurality of heat conduction layers is formed thicker than the film thickness of the pair of resistance heating elements 3 and 4. [ For this reason, in the heat conductor 10, the cross-sectional area in which the thermal conductivity is proportional to the thermal conductivity at the same film thickness as that of the pair of resistance heating elements 3 and 4 is increased. Here, the base layer is a heat conduction layer formed simultaneously with the pair of resistance heating elements 3 and 4, and is a heat conduction layer in contact with the substrate 2. [

The base layer constituting the heat conductor 10 is formed of the same material as the pair of resistance heating elements 3 and 4. That is, the base layer is formed by applying the same resistance heating body paste as the pair of resistance heating bodies 3 and 4 on the substrate 2 by screen printing or the like and baking. The base layer in the present embodiment is formed at the same time as the pair of resistance heating elements 3 and 4. In the present embodiment, the design length in the long-side direction of the base layer is 2.4 mm. The thickness of the base layer is the same as the thickness of the pair of resistance heating elements 3 and 4. The plurality of thermally conductive layers constituting the heat conductor 10 are formed of the same material as the conductors 5 to 7. That is, the heat conductor 10 including the base layer and the plurality of heat conduction layers contains silver having excellent thermal conductivity, and transfers heat from the pair of resistance heating elements 3 and 4. The plurality of thermally conductive layers are formed of the same material as the conductors 5 to 7 containing silver as a main component and the same material as the pair of resistance heating elements 3 and 4 including ruthenium oxide or silver- The thermal conductivity is better than that of the base layer. Further, the plurality of thermally conductive layers comprise silver as a main component, and are cheaper than the base layer containing ruthenium oxide or silver-palladium alloy.

The reason that the pair of resistance heating bodies 3 and 4 and the base layer are simultaneously formed is that the pair of resistance heating bodies 3 and 4 and the base layer are formed on the substrate 2 in the same process, And is formed by coating.

The gap between the pair of resistance heating bodies 3 and 4 and the base layer in the short side direction is an interval that does not take into account the position error occurring when the pair of resistance heating bodies 3 and 4 and the base layer are separately formed , And a narrower gap than when the pair of resistance heating elements 3 and 4 and the base layer are separately formed. In the present embodiment, the interval between the pair of resistance heating bodies 3 and 4 and the base layer in the short side direction is preferably set to an interval of 0.3 mm or more and 0.5 mm or less. The design interval in this embodiment is 0.3 mm.

If the distance between the pair of resistance heating bodies 3 and 4 and the base layer in the short side direction is 0.3 mm or more, if the distance is shorter than 0.3 mm, for example, a position error or a pattern blur This is because there is a possibility that the pair of resistance heating bodies 3 and 4 and the heat conductor 10 are electrically in contact with each other. The distance between the pair of resistance heating bodies 3 and 4 and the base layer in the short side direction is set to 0.5 mm or less because the volume of the heat conductor 10 becomes smaller when the thickness exceeds 0.5 mm, Because.

Since the pair of resistance heating bodies 3 and 4 and the plurality of heat conduction layers are formed separately from each other in the short side direction of the pair of resistance heating bodies 3 and 4 and the plurality of heat conduction layers, The distance between the pair of resistance heating bodies 3 and 4 and the plurality of thermally conductive layers is set at an interval such that no electrical short-circuit occurs between them. It is preferable that the interval between the pair of resistance heating bodies 3 and 4 and the plurality of thermally conductive layers in the short-side direction in this embodiment is set larger than 0.5 mm.

The overcoat layer 11 is a protective layer covering the pair of resistance heating elements 3 and 4, conductors 5 to 7 and the heat conductor 10 formed on the substrate 2. [ The overcoat layer 11 in this embodiment is formed in a strip shape along the long side direction and covers the pair of resistance heating elements 3 and 4, conductors 5 to 7 and the heat conductor 10. The overcoat layer 11 prevents direct exposure of the pair of resistance heating elements 3 and 4, the conductors 5 to 7 and the heat conductor 10 to the atmosphere and prevents interference (e.g., mechanical, (5, 6, 7) and the heat conductor (10) are prevented from being damaged or broken due to heat, chemical or electrical interference between the heaters (3, 4). The overcoat layer 11 has a thermal conductivity higher than that of the substrate 2. For example, an inorganic oxide filler having excellent thermal conductivity such as alumina is added in an amount of 25% by weight to 35% by weight and a thermal conductivity of 2 [W / k)] or more.

Next, the operation of the heater 1-1 will be described. Electric power is supplied to the heater 1-1 from the outside through the electrodes 8 and 9, respectively. Power is supplied from the heater 1-1 so that each of the pair of resistance heating elements 3 and 4 is energized in the long-side direction. In the heater 1-1, the heat conductor 10 transfers heat from the pair of resistance heating elements 3 and 4. Therefore, the heater 1-1 can suppress the temperature unevenness of the substrate 2 in the long-side direction.

Further, when the heater 1-1 heats the medium, various media pass through the heater 1-1. The length of the heater 1-1 in the long-side direction corresponds to the size (length parallel to the long-side direction) of the medium, and is set according to the maximum size of the heated medium. In general, the positional relationship between the heater 1-1 and the medium in the long side direction coincides with the center of the mediums and the center of the long side direction of the pair of resistance heating elements 3 and 4 (including almost match). Therefore, when the small-sized medium passes through the pair of resistance heating elements 3 and 4 in the heater 1-1, the medium receives the heat in the portion facing the medium passing therethrough. However, Since the heat from the portion of the resistance heating elements 3 and 4 that is not facing the medium (relatively high temperature portion) toward the medium (the relatively low temperature portion) is transmitted to the medium, the temperature difference in the long side direction Thereby suppressing the increase. Further, in the heater 1-1, when a large-sized medium passes through the pair of resistance heating elements 3 and 4, the medium receives heat at a portion facing the medium passing therethrough. However, Since the heat from the heat generating elements 3 and 4 is transmitted to the long side direction of the heat conductor 10 and the heat from the pair of resistance heating elements 3 and 4 is thermally diffused in the long side direction, (2) is prevented from increasing in the long-side direction. Therefore, the heater 1-1 can suppress temperature variations of the substrate 2 in the long-side direction even when passing through various media.

In the first embodiment, the pair of resistance heating elements 3 and 4 are formed in a band shape along the long side direction so that the length in the short side direction is constant, but the present invention is not limited thereto. 2 is a schematic view showing a first modification of the heater of the first embodiment. In the heater 1-2, as shown in Fig. 2, the pair of resistance heating elements 3 and 4 are formed such that the length in the short-side direction is gradually shortened from both ends in the long-side direction toward the center. In the heater 1-2, the heat conductor 10 is formed in a strip shape along the long side direction so that the length in the short side direction becomes constant.

Next, the operation of the heater 1-2 will be described. Electric power is supplied to the heater 1-2 from the outside through the electrodes 8 and 9, respectively. Power is supplied from the heater 1-2 so that each of the pair of resistance heating elements 3 and 4 is energized in the long-side direction. In the heater 1-2, the heat conductor 10 transfers heat from the pair of resistance heating bodies 3 and 4. Therefore, the heater 1-2 can suppress temperature unevenness of the substrate 2 in the long-side direction.

In the first modification of the first embodiment, the heat conductor 10 is formed in a strip shape along the long side direction so that the length in the long side direction becomes constant. However, the present invention is not limited to this. 3 is a schematic diagram showing a second modification of the heater of the first embodiment. In the heater 1-3, as shown in Fig. 3, the pair of resistance heating elements 3 and 4 are formed such that the length in the short side direction is gradually shortened from both ends in the long side direction toward the center. In the heaters 1-3, the length of the heat conductor 10 in the short side direction is formed to be gradually longer from both ends in the long side direction toward the center. That is, in the heater 1-3, the heat conductor 10 is formed so that the interval in the direction of the short side with the pair of resistance heating elements 3 and 4 becomes constant.

Next, the operation of the heater 1-3 will be described. Electric power is supplied to the heater 1-3 from the outside through the electrodes 8 and 9, respectively. Power is supplied from the heater 1-3 so that each of the pair of resistance heating elements 3 and 4 is energized in the long-side direction. In the heater 1-3, the heat conductor 10 transfers heat from the pair of resistance heating elements 3 and 4. Therefore, the temperature of the substrate 2 in the long-side direction can be suppressed by the heaters 1-3.

[Embodiment 2]

Next, a second embodiment will be described. 4 is a schematic diagram showing the heater of the second embodiment.

The heater 1-4 shown in Fig. 4 is different from the heater 1-1 in that the heat conductor 10 disposed between the pair of resistance heating elements 3 and 4 is electrically contacted with the conductor 7 .

The heat conductor 10 is disposed between the pair of resistance heating elements 3 and 4. The heat conductor 10 is in electrical non-contact with the pair of resistance heating elements 3 and 4 and extends in the long-side direction. The heat conductor (10) is formed in a strip shape along the long side direction so that the length in the short side direction becomes constant. The heat conductor 10 is in electrical contact with the conductor 7, which is electrically connected to each of the pair of resistance heating elements 3, 4. The other end in the longitudinal direction of the heat conductor 10 in this embodiment is in electrical contact with the conductor 7. That is, the heat conductor 10 is electrically connected to the conductor 7. Therefore, in the heat conductor 10, a potential difference generated in the long-side direction can be set at the time of energization of the pair of resistance heating elements 3, 4.

Next, the operation of the heater 1-4 will be described. Electric power is supplied to the heaters 1-4 from the outside through the electrodes 8 and 9, respectively. Power is supplied from the heater 1-4 so that each of the pair of resistance heating elements 3 and 4 is energized in the long-side direction. In the heater 1-4, the heat conductor 10 transfers heat from the pair of resistance heating elements 3 and 4. Therefore, the heater 1-4 can suppress the temperature unevenness of the substrate 2 in the long-side direction.

The heater 1-4 can set a potential difference generated in the long-side direction of the heat conductor 10, and thus is preferable as a heater mounted on an electronic device for heating a medium such as paper.

In the second embodiment, the pair of resistance heating elements 3 and 4 are formed in a strip shape along the long side direction so that the length in the short side direction becomes constant, but the present invention is not limited thereto. 5 is a schematic view showing a first modification of the heater of the second embodiment. In the heater 1-5, as shown in Fig. 4, the pair of resistance heating elements 3 and 4 are formed such that the length in the short-side direction is gradually shortened from both ends in the long-side direction toward the center. In the heater 1-5, the heat conductor 10 is formed in a strip shape along the long side direction so that the length in the short side direction becomes constant.

Next, the operation of the heater 1-5 will be described. Electric power is supplied to the heater 1-5 from the outside through the electrodes 8 and 9, respectively. Power is supplied from the heater 1-5 so that each of the pair of resistance heating elements 3 and 4 is energized in the long-side direction. In the heater 1-5, the heat conductor 10 transfers heat from the pair of resistance heating elements 3 and 4. Therefore, the heater 1-5 can suppress temperature unevenness of the substrate 2 in the long-side direction.

In the first modification of the second embodiment, the heat conductor 10 is formed in a strip shape along the long side direction so that the length in the short side direction becomes constant. However, the present invention is not limited to this. 6 is a schematic diagram showing a second modification of the heater of the second embodiment. In the heater 1-6, the pair of resistance heating elements 3 and 4 are formed such that the length in the short-side direction is gradually shortened from both ends in the long-side direction toward the center as shown in Fig. In the heaters 1-6, the heat conductor 10 is formed such that the length in the short side direction gradually becomes longer from both ends in the long side direction toward the center. That is, in the heaters 1-6, the heat conductor 10 is formed so that the interval in the short side direction from the pair of resistance heating elements 3 and 4 is made constant.

Next, the operation of the heater 1-6 will be described. Electric power is supplied to the heaters 1-6 from the outside through the electrodes 8 and 9, respectively. Power is supplied from the heaters 1-6, so that each of the pair of resistance heating elements 3 and 4 is energized in the long-side direction. In the heaters 1-6, the heat conductor 10 transfers heat from the pair of resistance heating elements 3, 4. Therefore, in the heaters 1-6, the temperature unevenness of the substrate 2 in the long-side direction can be suppressed.

In the above embodiment and its modified examples, the heat conductor 10 is formed by stacking a plurality of thermally conductive layers on a base layer, but the thermally conductive layer 10 may be formed by stacking one thermally conductive layer on the base layer. In this case, it is preferable that the combined thickness of the base layer and the heat conduction layer is thicker than the thickness of the pair of resistance heating elements 3, 4.

In the above embodiment and its modifications, the heat conductor 10 is formed by stacking a plurality of thermally conductive layers on a base layer, but it may be composed only of a base layer.

In the above-described embodiment and its modification, one end in the longitudinal direction of each of the pair of resistance heating elements 3 and 4 and the heat conductor 10 is located at the same position on the substrate 2 in the long-side direction One end of the heat conductor 10 may protrude from the one end of the pair of resistance heating elements 3 and 4 to the long side of the resistance heating element 3 or 4 and the other end of the heat conductor 10 may be connected to a pair of resistors (That is, one end of the heat conductor 10 may be recessed toward the other end 2b side in the long side direction) than the one end of the heat generating elements 3 and 4. [

Next, an embodiment of a fixing device provided with a heater will be described. 7 is an explanatory view showing a fixing device which is an example of use of a heater. As shown in the figure, the fixing device 200 can be any of the heaters 1-1 to 1-6 (hereinafter simply referred to as " heater 1 ") of the above-described embodiment and modifications thereof Can be used. In the fixing device 200, a heater 1 is provided at the bottom of a fixing film belt 201 wound around a support 202 in a cylindrical shape. The fixing film belt 201 is made of, for example, a heat-resistant resin material such as polyimide. A pressure roller 203 is provided at a position opposed to the heater 1 and the fixing film belt 201. The pressing roller 203 has a heat resistant elastic material such as a silicone resin layer 204 on its surface and rotates around the rotating shaft 205 in a state in which the fixing film belt 201 is in pressure contact One arrow A).

In the toner fixing step, the toner image T1 adhered on the copying paper P as the medium is transferred to the heater 1 through the fixing film belt 201 at the contact surface between the fixing film belt 201 and the silicone resin layer 204 . As a result, at least the surface portion of the toner image T1 is softened beyond the melting point and melted. The copy paper P is separated from the heater 1 and also separated from the fixing film belt 201 on the paper discharge side of the pressure roller 203 so that the toner image T2 naturally radiates and solidifies again, The toner image T2 is fixed on the copy sheet P.

The use of the heater 1 capable of suppressing temperature unevenness of the substrate 2 in the direction of the long side of the fixing device 200 suppresses unevenness of heating and melting of the toner image T1 attached on the copy paper P can do.

Next, an embodiment of an image forming apparatus having a heater will be described. 8 is an explanatory view showing an image forming apparatus which is an example of use of a heater. Further, in the present embodiment, the image forming apparatus is the copying machine 100. [ As shown in the figure, in the copying machine 100, the respective components including the above-described fixing device 200 are housed in the housing body 101. A document placement table made of a transparent material such as glass is provided on the upper portion of the housing body 101 and the document P1 as an object from which image information is to be read is reciprocated on the document placement table ) Scan.

An illumination device 102 composed of a light control lamp and a reflector is provided in the upper portion of the housing body 101. Light emitted from the illumination device 102 is reflected by the surface of the original P1 on the original placement surface, And is slit-exposed on the photosensitive drum 104 by the single-focal small-diameter imaging element array 103. [ Further, the photosensitive drum 104 is rotatably provided (indicated by an arrow Z in the drawing).

A charger 105 is provided in the vicinity of the photosensitive drum 104 provided in the housing body 101 and the photosensitive drum 104 is charged uniformly (including almost uniformity) by the charger 105. [ The photosensitive drum 104 is coated with, for example, a zinc oxide photosensitive layer or an organic semiconductor photosensitive layer. An electrostatic image in which image exposure is performed by the short-focal spot diameter imaging element array 103 is formed on the charged photosensitive drum 104. [ This electrostatic image is formed into a toner image by using a toner made of a resin or the like softened and melted by heating by the developing device 106. [

The copy sheet P accommodated in the cassette 107 is conveyed to the pair of the pair of the conveying rollers 108 and the photosensitive drum 104 by synchronizing with the toner image on the photosensitive drum 104, And is conveyed onto the photosensitive drum 104 by the conveying roller 109 of the photosensitive drum 104. [ Then, the toner image on the photosensitive drum 104 is transferred onto the copy sheet P by the transfer discharger 110.

Thereafter, the copying paper P sent from the top of the photosensitive drum 104 to the downstream side is conveyed to the fixing device 200 by the conveying guide 111 to be subjected to the heat fixing process (the toner fixing process) 112). Further, after the toner image is transferred, the residual toner on the photosensitive drum 104 is removed by the cleaner 113.

The fixing device 200 has an effective length corresponding to the width (length) of the largest plate paper that the copier 100 can copy in the direction perpendicular to the moving direction of the copy paper P, (See Fig. 7) provided with a resistance heating body larger than the pressure roller 203 is pressed against the silicone resin layer 204 (see Fig. 7) attached to the outer periphery of the pressure roller 203. Fig.

The unfixed toner image on the copy paper P sent between the heater 1 and the pressure roller 203 is melted using the heat generated by the resistance heating element and is printed on the copy paper P by characters, And the like can be displayed.

According to the copying machine 100 of the present embodiment, the use of the heater 1 capable of suppressing the temperature unevenness of the substrate 2 in the long-side direction makes it possible to suppress the unevenness of the heating and melting on the non- .

Although the heater 1 has been described as an example for fixing the image forming apparatus such as the copying machine 100, the present invention is not limited to this. Or as a heat source for heat insulation.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and alterations can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope of the invention and the equivalents of the invention described in the claims.

1, 1-1 to 1-6: heater 2: substrate
3, 4: Resistance heating body 5 to 7: Conductor
8, 9: Electrode 10: Thermal conductor
100: copying machine (image forming apparatus) 203: pressure roller
P: Copy paper (medium) T1: Toner image

Claims (6)

Board;
A pair of resistance heating elements extending in a direction of a long side of the substrate with an interval in the short side direction of the substrate;
A conductor electrically connected to the pair of resistance heating elements;
An electrode electrically connected to the conductor; And
And a heat conductor disposed between the pair of resistance heating elements and formed of the same material as the pair of resistance heating elements. The method according to claim 1,
Wherein the heat conductor is formed so that two or more thermally conductive layers are laminated and thicker than the film thickness of the pair of resistance heating elements,
Wherein the base layer in contact with the substrate of the thermally conductive layer is formed of the same material as the pair of resistance heating elements. 3. The method according to claim 1 or 2,
Wherein the heat conductor is not in electrical contact with each of the pair of resistance heating elements and the conductor. 3. The method according to claim 1 or 2,
Wherein the heat conductor is in electrical contact with the conductor electrically connected to each of the pair of resistance heating elements. 3. The method according to claim 1 or 2,
Wherein a distance between the pair of resistance heating elements and the heat conductor is 0.3 mm or more and 0.5 mm or less in the short side direction. The heater according to any one of claims 1 to 3, which heats the medium to be passed therethrough; And
And a pressure roller which pressurizes the medium upon heating,
And heating and pressing the medium to fix the toner image attached to the medium.
KR1020150076099A 2014-09-03 2015-05-29 Heater and image forming apparatus KR20160028343A (en)

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Publication number Priority date Publication date Assignee Title
WO2017131041A1 (en) * 2016-01-29 2017-08-03 株式会社美鈴工業 Heater and fixing device equipped with same, image forming device, and heating device
CN109698159B (en) * 2017-10-19 2021-04-06 元太科技工业股份有限公司 Driving substrate
TWI631741B (en) 2017-10-19 2018-08-01 元太科技工業股份有限公司 Driving substrate
JP7129212B2 (en) * 2018-05-22 2022-09-01 キヤノン株式会社 Fixing device

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JPH0265086A (en) 1988-08-30 1990-03-05 Toshiba Lighting & Technol Corp Heating element
JPH0794260A (en) 1993-07-30 1995-04-07 Toshiba Lighting & Technol Corp Heater and fixing device
JP2009244867A (en) 2008-03-14 2009-10-22 Canon Inc Image heating apparatus and heater used for the image heating apparatus

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JP2007035505A (en) * 2005-07-28 2007-02-08 Harison Toshiba Lighting Corp Heater, heating device, and image processing device
JP5381878B2 (en) * 2010-04-08 2014-01-08 住友電気工業株式会社 Wafer heating heater unit and semiconductor manufacturing apparatus equipped with the same

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JPH0265086A (en) 1988-08-30 1990-03-05 Toshiba Lighting & Technol Corp Heating element
JPH0794260A (en) 1993-07-30 1995-04-07 Toshiba Lighting & Technol Corp Heater and fixing device
JP2009244867A (en) 2008-03-14 2009-10-22 Canon Inc Image heating apparatus and heater used for the image heating apparatus

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