JP2017026785A - Heater and image forming apparatus - Google Patents

Heater and image forming apparatus Download PDF

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JP2017026785A
JP2017026785A JP2015144502A JP2015144502A JP2017026785A JP 2017026785 A JP2017026785 A JP 2017026785A JP 2015144502 A JP2015144502 A JP 2015144502A JP 2015144502 A JP2015144502 A JP 2015144502A JP 2017026785 A JP2017026785 A JP 2017026785A
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substrate
conductor
resistance heating
longitudinal direction
heater
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JP6589434B2 (en
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雅彦 玉井
Masahiko Tamai
雅彦 玉井
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Toshiba Lighting and Technology Corp
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Toshiba Lighting and Technology Corp
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Abstract

PROBLEM TO BE SOLVED: To solve the problem in which: a phenomenon occurs in a heater in which a temperature distribution in the longitudinal direction of the heater becomes ununiform at the start of operation or when the sheet size is changed; and to provide a heater and an image forming apparatus that can make uniform a temperature distribution in the longitudinal direction of a substrate.SOLUTION: A heater according to an embodiment comprises: a long substrate; a first conductor that is provided along the longitudinal direction on the substrate; a second conductor that is provided along the longitudinal direction of the substrate; and resistance heating elements that are electrically connected between the first conductor and the second conductor, provided in plurality in parallel in the longitudinal direction on the substrate, and have PTC characteristics, where at least one of the lengths of contact between the first conductor and the second conductor in the end areas in the longitudinal direction of the substrate is larger than the length of contact in a center area in the longitudinal direction of the substrate.SELECTED DRAWING: Figure 3

Description

本発明の実施形態は、ヒータおよび画像形成装置に関する。   Embodiments described herein relate generally to a heater and an image forming apparatus.

ＯＡ機器、家電用電気製品、精密製造設備などの電子機器類にヒータが装着されている。ヒータは、例えば、複写機やファクシミリなどの画像形成装置において用紙にトナーを定着する画像形成装置に用いられる。また、リライタブルカードリーダであれば印字消去などに用いられる。   Heaters are mounted on electronic devices such as office automation equipment, home appliances, and precision manufacturing equipment. The heater is used in an image forming apparatus that fixes toner onto a sheet in an image forming apparatus such as a copying machine or a facsimile. In addition, a rewritable card reader is used for erasing printing.

抵抗発熱体を用いるヒータにおいては、電源電圧に応じた１００Ｖ仕様や２００Ｖ仕様等がある。また、ヒータで加熱される記録媒体のサイズに応じたＡ３サイズ仕様やＡ４サイズ仕様等がある。このような組み合わせごとに抵抗発熱体の単位面積あたりのシート抵抗値（Ω／□：ｏｈｍｓ ｐｅｒ ｓｑｕａｒｅ）を変更することで対応している。   In the heater using the resistance heating element, there are a 100V specification and a 200V specification corresponding to the power supply voltage. In addition, there are A3 size specifications and A4 size specifications according to the size of the recording medium heated by the heater. This is dealt with by changing the sheet resistance value (Ω / □: ohms per square) per unit area of the resistance heating element for each combination.

抵抗発熱体の材料として一般的に、抵抗温度係数［ｐｐｍ／℃］が０あるいは正となる、ＰＴＣ（Positive Temperature Coefficient）特性を持つ材料を用いる方法がある。その場合、ヒータの長手方向において、抵抗発熱体を複数に分割し、かつ各抵抗発熱体でヒータの短手方向に電流が流れるように、一対の導体をヒータの短手方向の両端に設けることで、所望とする発熱量を実現している。   In general, there is a method of using a material having a PTC (Positive Temperature Coefficient) characteristic in which a resistance temperature coefficient [ppm / ° C.] is 0 or positive as a material of the resistance heating element. In that case, in the longitudinal direction of the heater, the resistance heating element is divided into a plurality of pieces, and a pair of conductors are provided at both ends in the short direction of the heater so that current flows in the short direction of the heater in each resistance heating element. Thus, a desired calorific value is realized.

特開２０１４−０５９５０８号公報JP, 2014-059508, A

ヒータは、通電開始時や用紙サイズの切り替え時等に、基板の長手方向において温度分布が不均一となる現象が発生する。   The heater has a phenomenon that the temperature distribution becomes non-uniform in the longitudinal direction of the substrate when energization is started or the paper size is switched.

本発明は、基板の長手方向における温度分布を均一とすることが可能なヒータおよび画像形成装置を提供する。   The present invention provides a heater and an image forming apparatus capable of making the temperature distribution in the longitudinal direction of the substrate uniform.

実施形態のヒータは、長尺な基板と；前記基板上の長手方向に沿って設けられる第１導体と；前記基板上の長手方向に沿って設けられる第２導体と；前記第１導体と前記第２導体との間に電気的に接続され、前記基板上の長手方向に並列に複数設けられ、前記基板の長手方向の端部領域における前記第１導体と前記第２導体との接触長さの少なくとも一方が、前記基板の長手方向の中央領域における接触長さよりも大きく、ＰＴＣ特性を有する抵抗発熱体と；を具備することを特徴とする。   The heater of the embodiment includes a long substrate; a first conductor provided along a longitudinal direction on the substrate; a second conductor provided along a longitudinal direction on the substrate; the first conductor and the Contact length between the first conductor and the second conductor in the end region in the longitudinal direction of the substrate, which is electrically connected between the second conductor and provided in parallel in the longitudinal direction on the substrate. At least one of which is longer than the contact length in the center region in the longitudinal direction of the substrate and has a resistance heating element having PTC characteristics.

本発明によれば、基板の長手方向での温度分布を均一とすることができる、ＰＴＣ特性のヒータ及び画像形成装置を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the heater and image forming apparatus of a PTC characteristic which can make uniform temperature distribution in the longitudinal direction of a board | substrate can be provided.

従来のヒータを例示する概略図である。It is the schematic which illustrates the conventional heater. 第１の実施形態を例示するヒータの概略図である。It is the schematic of the heater which illustrates 1st Embodiment. 第２の実施形態を例示するヒータの概略図である。It is the schematic of the heater which illustrates 2nd Embodiment. 第３の実施形態を例示するヒータの概略図である。It is the schematic of the heater which illustrates 3rd Embodiment. 第４の実施形態を例示するヒータの概略図である。It is the schematic of the heater which illustrates 4th Embodiment. 第５の実施形態を例示するヒータの概略図である。It is the schematic of the heater which illustrates 5th Embodiment. ヒータの使用例である画像形成装置の概略図である。It is the schematic of the image forming apparatus which is an example of use of a heater.

以下、図面を参照して各実施形態を説明する。
なお、図面は模式的または概念的なものであり、各部分の寸法や比率などは、必ずしも現実のものと同一とは限らない。また、各図面において同じ構成および作用効果については、同一符号を用いてその説明を省略する。 Hereinafter, each embodiment will be described with reference to the drawings.
The drawings are schematic or conceptual, and the dimensions and ratios of each part are not necessarily the same as actual ones. Moreover, about the same structure and effect in each drawing, the description is abbreviate | omitted using the same code | symbol.

以下、従来のヒータの構成を、図１を参照して説明する。   Hereinafter, the configuration of a conventional heater will be described with reference to FIG.

図１に例示するように、ヒータ１Ａは、基板２と、第１導体３と、第２導体４と、抵抗発熱体５を具備する。第１導体３は、基板２の長手方向に沿って、基板２の短手方向における幅を一定に形成されている。第２導体４ａ、４ｂは、第１導体３の基板２の短手方向両側にそれぞれ設けられており、基板２の長手方向に沿って第１導体３と所定の間隔を保って形成されている。抵抗発熱体５は、ＰＴＣ特性を有し、第１導体３と、第２導体４との間に互いに離間するように、四辺形状に複数に分割され、電気的に並列に接続されている。例えば複数に分割される抵抗発熱体５ａは、基板２長手方向に対して斜めに設けられており、隣り合って設けられる抵抗発熱体５ａと、基板２の短手方向において少なくとも一部が位置的に重なるように設けられている。   As illustrated in FIG. 1, the heater 1 </ b> A includes a substrate 2, a first conductor 3, a second conductor 4, and a resistance heating element 5. The first conductor 3 is formed with a constant width in the short direction of the substrate 2 along the longitudinal direction of the substrate 2. The second conductors 4 a and 4 b are provided on both sides of the first conductor 3 in the short direction of the substrate 2, and are formed at a predetermined distance from the first conductor 3 along the longitudinal direction of the substrate 2. . The resistance heating element 5 has PTC characteristics, and is divided into a plurality of quadrilateral shapes so as to be separated from each other between the first conductor 3 and the second conductor 4, and is electrically connected in parallel. For example, the resistance heating element 5 a divided into a plurality is provided obliquely with respect to the longitudinal direction of the substrate 2, and at least a part of the resistance heating element 5 a provided adjacent to the lateral direction of the substrate 2 is positioned. It is provided so as to overlap.

位置的に重なるとは、記録媒体のトナー定着に必要な範囲が通過するヒータ１Ａの領域に、記録媒体搬送方向視において、発熱しない領域が形成されないように抵抗発熱体５ａを設けることである。抵抗発熱体５ａがこのように設けられることにより、基板２の短手方向を通過方向とする記録媒体の加熱を必要とする範囲は、ヒータ１Ａを通過時に抵抗発熱体５ａによって発熱する領域を必ず通過する。ヒータ１Ａの長手方向において、例えば３１個の抵抗発熱体５ａ１〜５ａ３１の列が第１導体３と第２導体４ａとの間に形成されている。同様に、３１個の抵抗発熱体５ｂ１〜５ｂ３１が、第１導体３と第２導体４ｂとの間に形成されている。このとき基板２上で、抵抗発熱体５ａ、５ｂが形成されている、ヒータ１Ａの発熱する領域を発熱領域Ｔと称する。   “Positively overlapping” means that the resistance heating element 5a is provided in the area of the heater 1A through which the range necessary for fixing the toner on the recording medium passes so that no area that does not generate heat is formed when viewed in the conveyance direction of the recording medium. By providing the resistance heating element 5a in this way, the area that requires heating of the recording medium with the transverse direction of the substrate 2 as the passing direction must always include an area that generates heat by the resistance heating element 5a when passing through the heater 1A. pass. In the longitudinal direction of the heater 1A, for example, a row of 31 resistance heating elements 5a1 to 5a31 is formed between the first conductor 3 and the second conductor 4a. Similarly, 31 resistance heating elements 5b1 to 5b31 are formed between the first conductor 3 and the second conductor 4b. At this time, a region where the heater 1A generates heat on which the resistance heating elements 5a and 5b are formed on the substrate 2 is referred to as a heat generation region T.

ヒータ１Ａは、搭載されるプリンターの運転開始時や用紙サイズの切り替え時等に、ヒータ１Ａの長手方向における温度分布が不均一となる現象が発生する。   In the heater 1A, a phenomenon occurs in which the temperature distribution in the longitudinal direction of the heater 1A becomes non-uniform when the operation of the installed printer is started or when the paper size is switched.

例えば、抵抗発熱体５ａ１、５ｂ１、５ａ３１、５ｂ３１は、基板２の長手方向の端部領域に設けられている。これら４個の抵抗発熱体５からヒータ１Ａの両端側に向かう基板２上には、第１導体３および第２導体４ａ、４ｂ、電極６ａ、６ｂしか設けられていないため発熱せず、記録媒体が加熱されない領域である。   For example, the resistance heating elements 5 a 1, 5 b 1, 5 a 31, 5 b 31 are provided in the end region in the longitudinal direction of the substrate 2. Since only the first conductor 3 and the second conductors 4a and 4b and the electrodes 6a and 6b are provided on the substrate 2 from the four resistance heating elements 5 toward both ends of the heater 1A, the recording medium does not generate heat. Is a region that is not heated.

ヒータ１Ａの通電時に抵抗発熱体５ａ１、５ｂ１、５ａ３１、５ｂ３１から発生する熱は、ヒータ１Ａを通過する記録媒体の加熱のみならず、基板２の記録媒体が通過しない領域にも伝達される。これにより、抵抗発熱体５ａ、５ｂの列の端部領域では、トナー定着性を確保することが可能な温度を達成することが困難となる。   The heat generated from the resistance heating elements 5a1, 5b1, 5a31, 5b31 when the heater 1A is energized is transmitted not only to the heating of the recording medium passing through the heater 1A but also to the area of the substrate 2 through which the recording medium does not pass. This makes it difficult to achieve a temperature at which toner fixability can be ensured in the end region of the row of resistance heating elements 5a and 5b.

例えば、ヒータ１Ａを搭載した画像形成装置の運転開始時にヒータ１Ａが通電され、個々の抵抗発熱体５が発熱する。しかし、基板２の端部領域に形成される抵抗発熱体５は、基板２の両端側の発熱しない領域に熱を奪われるため、所望とする温度に達するまでに時間を要する。   For example, when the operation of the image forming apparatus equipped with the heater 1A is started, the heater 1A is energized and each resistance heating element 5 generates heat. However, since the resistance heating element 5 formed in the end region of the substrate 2 is deprived of heat in the non-heat-generating regions on both ends of the substrate 2, it takes time to reach a desired temperature.

また、小サイズの記録媒体がヒータ１Ａの長手方向の中央部を連続して通過する場合、ヒータ１Ａの端部領域に設けられる抵抗発熱体５は、記録媒体が通過しないためＰＴＣ特性により抵抗値が大きくなり、発熱量が低下する。次に、最大サイズの記録媒体を通過させる場合、ヒータ１Ａの端部領域はＰＴＣ特性により温度が低下していることに加え、抵抗発熱体５ａ１、５ｂ１、５ａ３１、５ｂ３１は基板２の発熱しない領域に熱を奪われるため、所望とする温度に達するまでに時間を要する。   Further, when a small-size recording medium passes continuously through the central portion in the longitudinal direction of the heater 1A, the resistance heating element 5 provided in the end region of the heater 1A has a resistance value due to the PTC characteristic because the recording medium does not pass through. Increases, and the amount of heat generation decreases. Next, when passing the maximum size recording medium, the temperature of the end region of the heater 1A is lowered due to the PTC characteristic, and the resistance heating elements 5a1, 5b1, 5a31, 5b31 are regions where the substrate 2 does not generate heat. Since it takes heat away, it takes time to reach the desired temperature.

例えばヒータ１Ａの長手方向における温度分布の不均一を解消するために、抵抗発熱体５の材料を調整する方法がある。基板２の端部に設けられる抵抗発熱体５のみを別の抵抗体ペーストを用いて構成する場合、発熱量を調整することが可能となる。しかし抵抗発熱体５の列を形成する際、少なくとも２種類の抵抗体ペーストを使用するため、工程数が増え製造コスト増加につながる。また、基板２上に抵抗体ペーストを塗布する際、抵抗値の異なる抵抗体ペースト同士が混同しないよう、工程上の位置ずれを考慮して、抵抗発熱体５同士の間隔を広くとる必要がある。その場合、基板２の長手方向の端部において、抵抗発熱体５が形成されない領域が広くなり、ヒータ１Ａの発熱分布がさらに不均一になりやすい。   For example, there is a method of adjusting the material of the resistance heating element 5 in order to eliminate the uneven temperature distribution in the longitudinal direction of the heater 1A. When only the resistance heating element 5 provided at the end of the substrate 2 is configured using another resistor paste, the amount of heat generation can be adjusted. However, since at least two types of resistor pastes are used when forming the rows of resistance heating elements 5, the number of processes increases and the manufacturing cost increases. In addition, when applying the resistor paste on the substrate 2, it is necessary to increase the distance between the resistance heating elements 5 in consideration of positional displacement in the process so that the resistor pastes having different resistance values are not confused with each other. . In that case, a region where the resistance heating element 5 is not formed is widened at the end in the longitudinal direction of the substrate 2, and the heat generation distribution of the heater 1 </ b> A is likely to be more uneven.

本発明に係るヒータ１は、ヒータ１の長手方向の端部領域に設けられる抵抗発熱体５ａ１、５ｂ１、５ａ３１、５ｂ３１と第１導体３、第２導体４との接触長さ、あるいは第１導体３、第２導体４の形状を変化させることによって、ヒータ１長手方向の端部領域の抵抗値を調整する。これにより、ヒータ１長手方向の端部領域の温度を上昇させることができ、ヒータ１の長手方向における温度分布を均等とすることが可能となる。   The heater 1 according to the present invention has a contact length between the resistance heating elements 5a1, 5b1, 5a31, 5b31 and the first conductor 3 and the second conductor 4 provided in the end region in the longitudinal direction of the heater 1, or the first conductor. 3. The resistance value of the end region in the longitudinal direction of the heater 1 is adjusted by changing the shape of the second conductor 4. Thereby, the temperature of the end region in the longitudinal direction of the heater 1 can be increased, and the temperature distribution in the longitudinal direction of the heater 1 can be made uniform.

以下、第１の実施形態を、図２を参照して説明する。   The first embodiment will be described below with reference to FIG.

本実施形態におけるヒータ１Ｂは、基板２の長手方向の端部領域に設けられる抵抗発熱体５と、第１導体３または第２導体４の少なくとも一方との接触長さを調整する。ここで接触長さとは、図２で例示するように、例えば抵抗発熱体５ａ１が第１導体３、第２導体４ａと電気的に接続されているＬ５ａ１、Ｌ’５ａ１を示す。   The heater 1 </ b> B in the present embodiment adjusts the contact length between the resistance heating element 5 provided in the end region in the longitudinal direction of the substrate 2 and at least one of the first conductor 3 or the second conductor 4. Here, as illustrated in FIG. 2, the contact length indicates, for example, L5a1 and L′ 5a1 in which the resistance heating element 5a1 is electrically connected to the first conductor 3 and the second conductor 4a.

ヒータ１Ｂにおいて、抵抗発熱体５ａの列の一方の端部に設けられる抵抗発熱体５ａ１は、隣に設けられる抵抗発熱体５ａ２と比較して、第１導体３との接触長さＬ’５ａ１の大きさは同じであるが、第２導体４ａとの接触長さＬ５ａ１が大きく形成されている。このため抵抗発熱体５ａ１は抵抗発熱体５ａ２よりも面積が広くなり、抵抗値が下がる。また、抵抗発熱体５ａ１の点線で囲まれたＣ部では、第１導体３と第２導体４ａ間において、電流が記録媒体搬送方向とほぼ平行の経路で流れる。これは最短の電流経路であるため、抵抗発熱体５ａの抵抗値がさらに低くなる。図２の形状とすることにより、抵抗発熱体５ａ１に流れる電流が増加し、発熱量が増大する。   In the heater 1B, the resistance heating element 5a1 provided at one end of the row of resistance heating elements 5a has a contact length L′ 5a1 with the first conductor 3 as compared with the resistance heating element 5a2 provided adjacently. Although the size is the same, the contact length L5a1 with the second conductor 4a is formed large. For this reason, the resistance heating element 5a1 has a larger area than the resistance heating element 5a2, and the resistance value decreases. Further, in the portion C surrounded by the dotted line of the resistance heating element 5a1, a current flows between the first conductor 3 and the second conductor 4a along a path substantially parallel to the recording medium conveyance direction. Since this is the shortest current path, the resistance value of the resistance heating element 5a is further reduced. With the shape shown in FIG. 2, the current flowing through the resistance heating element 5a1 increases, and the amount of heat generation increases.

また、抵抗発熱体５ａの列のもう一方の端部に設けられる抵抗発熱体５ａ３１も、隣に設けられる抵抗発熱体５ａ３０と比較して、第２導体４ａとの接触長さＬ５ａ３１は同じであるが、第１導体３との接触長さＬ’５ａ３１が大きく形成されている。   Further, the resistance heating element 5a31 provided at the other end of the row of resistance heating elements 5a also has the same contact length L5a31 with the second conductor 4a as compared to the resistance heating element 5a30 provided adjacently. However, the contact length L′ 5a31 with the first conductor 3 is formed large.

このように、ヒータ１Ｂの長手方向の端部に設けられる抵抗発熱体５と、第１導体３あるいは第２導体４との接触長さであるＬ５、Ｌ’５を大きく形成することにより、発熱量が増加するため、ヒータ１Ｂの長手方向の端部領域における温度低下を抑制することが可能となる。   In this way, by increasing the length L5, L′ 5 that is the contact length between the resistance heating element 5 provided at the end of the heater 1B in the longitudinal direction and the first conductor 3 or the second conductor 4, heat generation is achieved. Since the amount increases, it is possible to suppress a temperature decrease in the end region in the longitudinal direction of the heater 1B.

次に、第２の実施形態について、図３を参照して説明する。   Next, a second embodiment will be described with reference to FIG.

本実施形態におけるヒータ１Ｃは、基板２の長手方向の端部領域に設けられる抵抗発熱体５と、第１導体３および第２導体４との接触長さＬ５、Ｌ’５を調整する。   The heater 1 </ b> C in this embodiment adjusts contact lengths L <b> 5 and L ′ <b> 5 between the resistance heating element 5 provided in the end region in the longitudinal direction of the substrate 2 and the first conductor 3 and the second conductor 4.

ヒータ１Ｃにおいて抵抗発熱体５ａの列の一方の端部に設けられる抵抗発熱体５ａ１は、隣に設けられる抵抗発熱体５ａ２と比較して、第１導体３および第２導体４ａとの接触長さＬ５ａ１、Ｌ’５ａ１が大きく形成されている。このため抵抗発熱体５ａ１は抵抗発熱体５ａ２と比較して面積が大きくなり、抵抗値が低くなる。また、抵抗発熱体５ａ１の点線で囲まれたＣ部は、実施形態１の抵抗発熱体５１ａ１のＣ部よりも広く形成されている。そのため、第１導体３と第２導体４ａ間において電流がほぼ最短経路で流れる領域が広く形成されており、抵抗発熱体５ａ１の抵抗値がさらに下がる。図３の形状とすることにより、抵抗発熱体５ａ１に流れる電流量が増加し、抵抗発熱体５ａ１の発熱量が増大する。   In the heater 1C, the resistance heating element 5a1 provided at one end of the row of resistance heating elements 5a has a contact length between the first conductor 3 and the second conductor 4a as compared with the resistance heating element 5a2 provided adjacently. L5a1 and L′ 5a1 are formed large. For this reason, the resistance heating element 5a1 has a larger area and a lower resistance value than the resistance heating element 5a2. Further, the C portion surrounded by the dotted line of the resistance heating element 5a1 is formed wider than the C portion of the resistance heating element 51a1 of the first embodiment. For this reason, a region where the current flows almost along the shortest path is formed widely between the first conductor 3 and the second conductor 4a, and the resistance value of the resistance heating element 5a1 further decreases. With the shape of FIG. 3, the amount of current flowing through the resistance heating element 5a1 increases, and the amount of heat generated by the resistance heating element 5a1 increases.

このように、ヒータ１Ｃの長手方向の端部領域における抵抗発熱体５と、第１導体３および第２導体４との接触長さＬ５、Ｌ’５を大きく形成することにより、ヒータ１Ｃの長手方向の端部領域における発熱量を増加させることが可能となる。   As described above, the contact lengths L5 and L′ 5 between the resistance heating element 5 and the first conductor 3 and the second conductor 4 in the end region in the longitudinal direction of the heater 1C are formed to be long. It is possible to increase the amount of heat generated in the end region in the direction.

また、本実施形態によれば、ヒータ１Ｃの発熱領域Ｔの長さの調整を容易に行うことが可能である。   Further, according to the present embodiment, it is possible to easily adjust the length of the heat generating region T of the heater 1C.

通常、ヒータ１Ｃの発熱領域Ｔの長さを調整する場合、抵抗発熱体５を基板２長手方向に設ける数や、間隔を変更する。その場合、発熱領域Ｔの長さは、抗発熱体５を基板２上に設ける間隔と同等で調整される。抵抗発熱体５の材料である抵抗体ペーストを基板２上に印刷する際、隣に設けられる抵抗発熱体５と短絡しない間隔を保つ必要がある。そのため発熱領域Ｔの長さの調整も、抵抗発熱体５を基板２上に設ける間隔と同等になる。   Usually, when adjusting the length of the heat generating region T of the heater 1C, the number and interval of the resistance heating elements 5 provided in the longitudinal direction of the substrate 2 are changed. In this case, the length of the heat generating region T is adjusted to be equal to the interval at which the anti-heat generating element 5 is provided on the substrate 2. When printing the resistor paste, which is the material of the resistance heating element 5, on the substrate 2, it is necessary to maintain an interval that does not cause a short circuit with the resistance heating element 5 provided next to the resistance paste. Therefore, the adjustment of the length of the heat generating region T is equivalent to the interval at which the resistance heating element 5 is provided on the substrate 2.

本実施形態によれば、基板２の長手方向の端部領域に設けられる４つの抵抗発熱体５ａ１、５ｂ１、５ａ３１、５ｂ３１と第１導体３、第２導体４との接触長さＬ５、Ｌ’５は、抵抗発熱体５を設ける間隔と関係なく、所望とする長さに変更することができる。そのため、ヒータ１Ｃの発熱領域Ｔの長さを容易に調整することが可能となる。   According to the present embodiment, the contact lengths L5, L ′ of the four resistance heating elements 5a1, 5b1, 5a31, 5b31 provided in the end region in the longitudinal direction of the substrate 2 and the first conductor 3 and the second conductor 4 are provided. 5 can be changed to a desired length regardless of the interval at which the resistance heating element 5 is provided. Therefore, it is possible to easily adjust the length of the heat generation region T of the heater 1C.

次に、第３の実施形態について、図４を参照して説明する。   Next, a third embodiment will be described with reference to FIG.

本実施形態におけるヒータ１Ｄは、基板２上に形成される第１導体３の基板２短手方向における幅を調整する。   The heater 1D in the present embodiment adjusts the width of the first conductor 3 formed on the substrate 2 in the width direction of the substrate 2.

ヒータ１Ｄにおいて、第１導体３の基板２短手方向における幅は、基板２の長手方向の端部領域に向かって広くなるように形成されている。これにより、基板２の端部領域に向かうほど、抵抗発熱体５と導体３の電流が流れる経路が短くなるため、抵抗発熱体５に電流が流れやすくなり、ヒータ１Ｄの端部領域の発熱量が増加する。   In the heater 1 </ b> D, the width of the first conductor 3 in the short direction of the substrate 2 is formed so as to increase toward the end region in the longitudinal direction of the substrate 2. Thereby, since the path | route through which the electric current of the resistance heating element 5 and the conductor 3 flows becomes short toward the edge part area | region of the board | substrate 2, it becomes easy to flow an electric current through the resistance heating element 5, and the emitted-heat amount of the edge area | region of heater 1D. Will increase.

本実施形態においては、第１導体３の基板２の短手方向における幅を、基板２の長手方向の端部領域に向かって広くなるように形成しているが、第２導体４ａあるいは第２導体４ｂのどちらか一方、またはその両方の幅を広く形成してもよい。第１導体３と第２導体４の基板２の短手方向における幅の調整は、任意の組合せで行うことが可能である。   In the present embodiment, the width of the first conductor 3 in the lateral direction of the substrate 2 is formed so as to become wider toward the end region in the longitudinal direction of the substrate 2, but the second conductor 4 a or the second conductor 3 is formed. One or both of the conductors 4b may be formed wider. The adjustment of the width of the first conductor 3 and the second conductor 4 in the short direction of the substrate 2 can be performed in any combination.

次に、第４の実施形態について、図５を参照して説明する。   Next, a fourth embodiment will be described with reference to FIG.

本実施形態におけるヒータ１Ｅは、基板２の長手方向の端部領域における抵抗発熱体５と、第１導体３および第２導体４との接触長さＬ５、Ｌ’５を大きく形成する。さらに、第１導体３の基板２の短手方向における幅を、基板２の長手方向の端部領域に向かって広くなるように形成する。これにより、基板２の端部領域に向かうほど、抵抗発熱体５と導体３の電流が流れる経路が短くなるため、抵抗発熱体５に電流が流れやすくなり、ヒータ１Ｅの端部領域の発熱量を上昇させることが可能となる。   In the present embodiment, the heater 1 </ b> E has large contact lengths L <b> 5 and L ′ <b> 5 between the resistance heating element 5 and the first conductor 3 and the second conductor 4 in the end region in the longitudinal direction of the substrate 2. Further, the width of the first conductor 3 in the short direction of the substrate 2 is formed so as to increase toward the end region in the longitudinal direction of the substrate 2. Thereby, since the path | route through which the electric current of the resistance heating element 5 and the conductor 3 flows becomes short toward the edge part area | region of the board | substrate 2, it becomes easy to flow an electric current through the resistance heating element 5, and the emitted-heat amount of the edge area | region of the heater 1E Can be raised.

本実施形態においては第１導体３の基板２の短手方向における幅を、基板２の長手方向の端部領域に向かって広くなるように形成しているが、第１導体３および第２導体４ａあるいは第２導体４ｂのどちらか一方、またはその両方の幅を広く形成してもよい。抵抗発熱体５ａ１、５ｂ１、５ａ３１、５ｂ３１と第１導体３、第２導体４との接触長さＬ５、Ｌ’５や、第１導体３や第２導体４の基板２短手方向における幅の調整は、任意の組合せで行うことが可能である。   In the present embodiment, the width of the first conductor 3 in the lateral direction of the substrate 2 is formed so as to become wider toward the end region in the longitudinal direction of the substrate 2, but the first conductor 3 and the second conductor are formed. Either one of 4a or the second conductor 4b, or both may be formed wider. The contact lengths L5 and L′ 5 of the resistance heating elements 5a1, 5b1, 5a31 and 5b31 and the first conductor 3 and the second conductor 4 and the width of the first conductor 3 and the second conductor 4 in the width direction of the substrate 2 Adjustment can be performed in any combination.

次に、第５の実施形態について、図６を参照して説明する。   Next, a fifth embodiment will be described with reference to FIG.

本実施形態におけるヒータ１Ｆは、基板２上に形成される抵抗発熱体５ａ、５ｂは矩形状に形成されており、ヒータ１Ｆの記録媒体搬送方向とほぼ平行に基板２の長手方向に設けられている。抵抗発熱体５ａ、５ｂは矩形状に形成されるため、その全面が電流の最短経路となる。基板２の長手方向の端部領域に設けられる抵抗発熱体５ａ１、５ａ３１、５ｂ１、５ｂ３１も、矩形状に形成されて電流が流れやすくなる。また第１導体３および第２導体４との接触長さＬ５、Ｌ’５が大きく形成されており、ヒータ１Ｆの端部領域の温度を上昇させることが可能となる。   In the heater 1F in this embodiment, the resistance heating elements 5a and 5b formed on the substrate 2 are formed in a rectangular shape, and are provided in the longitudinal direction of the substrate 2 substantially parallel to the recording medium conveyance direction of the heater 1F. Yes. Since the resistance heating elements 5a and 5b are formed in a rectangular shape, the entire surface becomes the shortest path of current. The resistance heating elements 5a1, 5a31, 5b1, and 5b31 provided in the end region in the longitudinal direction of the substrate 2 are also formed in a rectangular shape so that current easily flows. Further, the contact lengths L5 and L'5 with the first conductor 3 and the second conductor 4 are formed large, and the temperature of the end region of the heater 1F can be raised.

本実施形態においては、複数の抵抗発熱体５が矩形状に形成されているため、基板２の長手方向で隣に設けられる抵抗発熱体５との間には、空隙部Ｇが形成されている。空隙部Ｇには抵抗発熱体５が形成されていないため、発熱しない領域となる。しかし本実施形態においては、抵抗発熱体５ａと５ｂの列は、それぞれの空隙部Ｇどうしが、記録媒体搬送方向において重ならないように設けられている。例えば記録媒体は、ヒータ１Ｆで最初に通過する空隙部Ｇ１によっては加熱されないが、次に通過する抵抗発熱体５ｂ２によって加熱される。そのため記録媒体はヒータ１Ｆを通過する際に、抵抗発熱体５ａあるいは５ｂの少なくともどちらかが設けられ、発熱する領域を通過する。このように抵抗発熱体５ａと５ｂの列を設けることにより、抵抗発熱体５ａ、５ｂを矩形状に形成し、ヒータ１Ｆの記録媒体搬送方向とほぼ平行に設けても、トナー定着が不均一となる現象を抑制することが可能となる。   In the present embodiment, since the plurality of resistance heating elements 5 are formed in a rectangular shape, a gap G is formed between the resistance heating elements 5 provided next to each other in the longitudinal direction of the substrate 2. . Since the resistance heating element 5 is not formed in the gap G, the gap G is a region that does not generate heat. However, in the present embodiment, the rows of resistance heating elements 5a and 5b are provided so that the gaps G do not overlap in the recording medium conveyance direction. For example, the recording medium is not heated by the gap G1 that first passes through the heater 1F, but is heated by the resistance heating element 5b2 that passes next. Therefore, when the recording medium passes through the heater 1F, at least one of the resistance heating elements 5a and 5b is provided and passes through the heat generating area. By providing the resistance heating elements 5a and 5b in this manner, even if the resistance heating elements 5a and 5b are formed in a rectangular shape and provided substantially parallel to the recording medium conveyance direction of the heater 1F, toner fixing is not uniform. It becomes possible to suppress this phenomenon.

本実施形態では、基板２の端部領域に設けられる抵抗発熱体５ａ１、５ａ３１、５ｂ１、５ｂ３１のうち、記録媒体搬送方向の上流側となる抵抗発熱体５ａ１と５ａ３１の面積は、下流側に設けられる抵抗発熱体５ｂ１、５ｂ３１と比較して大きく形成されている。これにより、記録媒体搬送方向の上流側に設けられる抵抗発熱体５ａの列の温度を速く上昇させることが可能となる。   In the present embodiment, among the resistance heating elements 5a1, 5a31, 5b1, and 5b31 provided in the end region of the substrate 2, the areas of the resistance heating elements 5a1 and 5a31 on the upstream side in the recording medium conveyance direction are provided on the downstream side. It is formed larger than the resistance heating elements 5b1 and 5b31. As a result, the temperature of the row of resistance heating elements 5a provided on the upstream side in the recording medium conveyance direction can be quickly increased.

記録媒体は、まず抵抗発熱体５ａの列を通過し、その後抵抗発熱体５ｂの列を通過する。そのため抵抗発熱体５ａの列の温度を、優先的に上昇させることが望ましい。抵抗発熱体５ａの列の端部温度を上昇させるためには、基板２の端部に設けられる抵抗発熱体５ａ１、５ａ３１と第１導体３、第２導体４との接触長さＬ５ａ１、Ｌ’５ａ１、Ｌ５ａ３１、Ｌ’５ａ３１を大きく形成することが効果的である。   The recording medium first passes through the row of resistance heating elements 5a and then passes through the row of resistance heating elements 5b. Therefore, it is desirable to preferentially raise the temperature of the row of resistance heating elements 5a. In order to increase the end temperature of the row of the resistance heating elements 5a, the contact lengths L5a1, L ′ of the resistance heating elements 5a1, 5a31 provided at the end of the substrate 2 with the first conductor 3 and the second conductor 4 It is effective to form 5a1, L5a31, and L′ 5a31 large.

本実施形態では、抵抗発熱体５の列を２列で例示したが、基板２の短手方向において形成される列数に制約はない。また、抵抗発熱体５の分割される大きさや数量、設けられる間隔は本実施形態に限定されず、ヒータの種類や大きさ、用途に応じて適宜変更することが可能である。抵抗発熱体５の列を基板２の短手方向において複数に形成する場合、記録媒体搬送方向の上流側の列と下流側の列を基板２の短手方向において設ける位置も、本実施形態に限定されない。   In the present embodiment, two rows of the resistance heating elements 5 are exemplified, but the number of rows formed in the short direction of the substrate 2 is not limited. Further, the size and quantity of the resistance heating element 5 to be divided and the interval provided are not limited to the present embodiment, and can be appropriately changed according to the type, size, and application of the heater. In the case where a plurality of rows of the resistance heating elements 5 are formed in the short direction of the substrate 2, positions where the upstream row and the downstream row in the recording medium conveyance direction are provided in the short direction of the substrate 2 are also included in this embodiment. It is not limited.

本発明における基板２は、耐熱性および絶縁性を有し、本実施形態では矩形状に形成されている。基板２は、例えば厚みが０．５ｍｍから１．０ｍｍ程度の平板であり、アルミナ等のセラミックやガラスセラミック、または耐熱複合材料などから構成される。基板２の形状は、短手方向および短手方向と交差する長手方向を有していれば、本実施形態に限定されるものではない。   The board | substrate 2 in this invention has heat resistance and insulation, and is formed in the rectangular shape in this embodiment. The substrate 2 is a flat plate having a thickness of about 0.5 mm to 1.0 mm, for example, and is made of a ceramic such as alumina, a glass ceramic, or a heat resistant composite material. The shape of the substrate 2 is not limited to this embodiment as long as it has a short direction and a longitudinal direction intersecting the short direction.

第１導体３および第２導体４は、抵抗発熱体５に電力を供給するものであり、基板２上に形成されている。第１導体３および第２導体４は、抵抗発熱体５と比較して抵抗値が十分低い銀（Ａｇ）等の導体ペーストで構成されている。   The first conductor 3 and the second conductor 4 supply power to the resistance heating element 5 and are formed on the substrate 2. The first conductor 3 and the second conductor 4 are made of a conductive paste such as silver (Ag) whose resistance value is sufficiently lower than that of the resistance heating element 5.

抵抗発熱体５は、ＰＴＣ特性を有しており、ホウケイ酸などのガラスに、８族、９族のルテニウム(Ｒｕ)、イリジウム（Ｉｒ）、ロジウム（Ｒｈ）などの酸化物のうち、少なくとも１種類、あるいはそれ以上の種類を添加した混合物からなる抵抗体ペーストで構成されている。抵抗発熱体４ａは、抵抗体ペーストを基板２上に塗布し、乾燥、焼成して形成される。「塗布」とは、基板２上に抵抗体ペーストを塗りつけることができればどのような方法でもよく、スクリーン印刷を含むものである。   The resistance heating element 5 has PTC characteristics and is made of glass such as borosilicate, and at least one of oxides such as Group 8 and Group 9 ruthenium (Ru), iridium (Ir), and rhodium (Rh). It is comprised with the resistor paste which consists of a mixture which added the kind or more. The resistance heating element 4a is formed by applying a resistor paste on the substrate 2, drying and firing. The “application” may be any method as long as the resistor paste can be applied onto the substrate 2 and includes screen printing.

オーバーコート層６は、基板２上に形成された第１導体３、第２導体４および抵抗発熱体５を覆っており、本実施形態では帯状に形成されている。オーバーコート層６は、例えば、アルミナ等の熱伝導性に優れた無機酸化物フィラーを、２５〜３５質量％加えたガラス層である。   The overcoat layer 6 covers the first conductor 3, the second conductor 4, and the resistance heating element 5 formed on the substrate 2, and is formed in a band shape in this embodiment. The overcoat layer 6 is a glass layer to which 25 to 35% by mass of an inorganic oxide filler having excellent thermal conductivity such as alumina is added.

オーバーコート層６は、第１導体３、第２導体４および抵抗発熱体５を覆うことで、第１導体３、第２導体４および抵抗発熱体５が直接大気に露出することを防止し、外部からの干渉（例えば、機械的、化学的、電気的な干渉）によって第１導体３、第２導体４および抵抗発熱体５が損傷・破損することを抑制するものである。   The overcoat layer 6 covers the first conductor 3, the second conductor 4, and the resistance heating element 5, thereby preventing the first conductor 3, the second conductor 4 and the resistance heating element 5 from being directly exposed to the atmosphere, The first conductor 3, the second conductor 4, and the resistance heating element 5 are prevented from being damaged or broken by external interference (for example, mechanical, chemical, or electrical interference).

次に、ヒータ１を備えた定着装置１００の一実施形態について説明する。図７はヒータ１の使用例である定着装置１００を示す説明図である。定着装置１００は、ヒータ１と、定着フィルム２００と、加圧ローラ３００とで構成されている。なお、定着装置１００は、実際は画像形成装置に内蔵されているが、画像形成装置は省略する。   Next, an embodiment of the fixing device 100 including the heater 1 will be described. FIG. 7 is an explanatory view showing a fixing device 100 as an example of use of the heater 1. The fixing device 100 includes a heater 1, a fixing film 200, and a pressure roller 300. The fixing device 100 is actually built in the image forming apparatus, but the image forming apparatus is omitted.

定着フィルム２００は、ポリイミド樹脂等の耐熱性シートからなるロール状のフィルムである。この定着フィルム２００の底部に、ヒータ１が配置されている。   The fixing film 200 is a roll film made of a heat resistant sheet such as a polyimide resin. The heater 1 is disposed at the bottom of the fixing film 200.

加圧ローラ３００は、回転軸によって回転可能に構成されたローラである。そのローラの表面には、耐熱性の弾性材料として、シリコーンゴム層が形成されている。シリコーンゴム層は、定着フィルム２００を介して、ヒータ１と弾接している。   The pressure roller 300 is a roller configured to be rotatable by a rotation shaft. A silicone rubber layer is formed on the surface of the roller as a heat-resistant elastic material. The silicone rubber layer is in elastic contact with the heater 1 through the fixing film 200.

ヒータ１が通電され、抵抗発熱体４ａｎで熱が発生し、その熱は基板を介し、定着フィルム２００および加圧ローラ３００を加熱する。そこに、定着フィルム２００および加圧ローラ３００の回転によってトナー像５００が付着した用紙４００が送られると、トナー像５００は自然放熱して冷却固化し、画像形成装置から離れる。   The heater 1 is energized and heat is generated by the resistance heating element 4an, and the heat heats the fixing film 200 and the pressure roller 300 through the substrate. When the sheet 400 having the toner image 500 attached thereto is fed by the rotation of the fixing film 200 and the pressure roller 300, the toner image 500 is naturally radiated to be cooled and solidified, and separated from the image forming apparatus.

本実施形態によれば、所望とする発熱分布を実現したヒータ１を用いることにより、用途に応じた画像形成装置１００を提供することができる。   According to this embodiment, by using the heater 1 that realizes a desired heat generation distribution, it is possible to provide the image forming apparatus 100 according to the application.

なお、本実施形態では、ヒータ１を画像形成装置１００のトナー定着用に使用する例を説明した。しかし、本発明は、この実施形態に限定されるものではない。例えば、家庭用の電気製品、業務用や実験用の精密機器や化学反応用の機器等に装着して加熱や保温の熱源として使用することができる。   In the present embodiment, the example in which the heater 1 is used for toner fixing of the image forming apparatus 100 has been described. However, the present invention is not limited to this embodiment. For example, it can be used as a heat source for heating or heat retention by being mounted on household electrical products, precision instruments for business use or experiments, equipment for chemical reaction, and the like.

本発明の実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   Although the 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 novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

１ ヒータ、 ２ 基板、 ３ 第１導体、 ４ 第２導体、 ５ 抵抗発熱体 DESCRIPTION OF SYMBOLS 1 Heater, 2 Board | substrate, 3 1st conductor, 4 2nd conductor, 5 Resistance heating element

Claims (5)

長尺な基板と；
前記基板上の長手方向に沿って設けられる第１導体と；
前記基板上の長手方向に沿って設けられる第２導体と；
前記第１導体と前記第２導体との間に電気的に接続され、前記基板上の長手方向に並列に複数設けられ、前記基板の長手方向の端部領域における前記第１導体と前記第２導体との接触長さの少なくとも一方が、前記基板の長手方向の中央領域における接触長さよりも大きく、ＰＴＣ特性を有する抵抗発熱体と；
を具備することを特徴とするヒータ。 A long substrate;
A first conductor provided along a longitudinal direction on the substrate;
A second conductor provided along a longitudinal direction on the substrate;
Is electrically connected between the front Symbol first conductor and the second conductor, a plurality provided in parallel in the longitudinal direction on the substrate, the said first conductor in the longitudinal direction of the end region of the substrate first A resistance heating element having at least one of contact lengths with two conductors larger than a contact length in a central region in a longitudinal direction of the substrate and having PTC characteristics;
The heater characterized by comprising. 前記抵抗発熱体は、前記基板の長手方向における発熱量が、前記基板の長手方向の端部領域に向かって大きくなるように設けられることを特徴とする請求項１に記載のヒータ。   2. The heater according to claim 1, wherein the resistance heating element is provided such that a heat generation amount in the longitudinal direction of the substrate increases toward an end region in the longitudinal direction of the substrate. 前記抵抗発熱体は、前記基板の長手方向に対して斜めに設けられるとともに、その少なくとも一部が隣に設けられる前記抵抗発熱体の少なくとも一部と前記基板短手方向において位置的に重なる部分を有していることを特徴とする請求項１または２に記載のヒータ。   The resistance heating element is provided obliquely with respect to the longitudinal direction of the substrate, and at least a part of the resistance heating element overlaps at least a part of the resistance heating element provided next to the substrate in the lateral direction of the substrate. The heater according to claim 1, wherein the heater is provided. 前記基板上に設けられる前記第１導体と前記第２導体は、前記基板の短手方向における幅が、前記基板の長手方向の端部領域に向かって広くなるように設けられることを特徴とする請求項１から３のいずれか一に記載のヒータ。   The first conductor and the second conductor provided on the substrate are provided so that a width in a short direction of the substrate becomes wider toward an end region in a longitudinal direction of the substrate. The heater according to any one of claims 1 to 3. 通過する記録媒体を加熱する請求項１から４のいずれか一に記載のヒータと；
前記記録媒体を加熱するローラと；
を具備し、前記記録媒体を加熱および加圧することで、前記記録媒体に付着したトナー像を定着させることを特徴とする画像形成装置。 The heater according to any one of claims 1 to 4, which heats the recording medium that passes through;
A roller for heating the recording medium;
And a toner image attached to the recording medium is fixed by heating and pressurizing the recording medium.
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JP7275890B2 (en) 2019-06-19 2023-05-18 株式会社リコー heating element, fixing device, image forming device

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