JP2023117633A - planar heating element - Google Patents

planar heating element Download PDF

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JP2023117633A
JP2023117633A JP2022020304A JP2022020304A JP2023117633A JP 2023117633 A JP2023117633 A JP 2023117633A JP 2022020304 A JP2022020304 A JP 2022020304A JP 2022020304 A JP2022020304 A JP 2022020304A JP 2023117633 A JP2023117633 A JP 2023117633A
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electrode
heating element
planar heating
terminal
ptc
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真志 梶
Shinji Kaji
貴之 日置
Takayuki Hioki
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Tokyo Cosmos Electric Co Ltd
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Tokyo Cosmos Electric Co Ltd
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Priority to PCT/JP2023/004488 priority patent/WO2023153493A1/en
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    • 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
    • H05B3/03—Electrodes
    • 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
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater

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Abstract

To provide a planar heating element capable of improving the efficiency of temperature control.SOLUTION: A planar heating element includes an insulating sheet having a first surface and a second surface that is the back surface thereof, a positive temperature coefficient (PTC) element provided on the first surface, and an electrode provided on the second surface, and the PTC element is provided on the first surface so as to surround the outer circumferential portion of the first surface, and is connected in series with the electrode, and the electrode is provided on the second surface such that a part of the electrode overlaps with the position of the PTC element in the first surface.SELECTED DRAWING: Figure 3

Description

本開示は、面状発熱体に関する。 The present disclosure relates to planar heating elements.

従来、平面状の基材の表面に電極とＰＴＣ（Positive Temperature Coefficient）素子とが設けられた面状発熱体が知られている（例えば、特許文献１参照）。 2. Description of the Related Art Conventionally, there is known a planar heating element in which electrodes and PTC (Positive Temperature Coefficient) elements are provided on the surface of a planar substrate (see, for example, Patent Document 1).

特開２０２１－１２５３８３号公報JP 2021-125383 A

従来の面状発熱体では、温度制御の効率の点で改善の余地があった。 Conventional planar heating elements have room for improvement in terms of temperature control efficiency.

本開示の一態様の目的は、温度制御の効率を向上させることができる面状発熱体を提供することである。 An object of one aspect of the present disclosure is to provide a planar heating element capable of improving the efficiency of temperature control.

本開示の一態様に係る面状発熱体は、第１面と、その裏面である第２面とを備えた絶縁シートと、前記第１面に設けられたＰＴＣ（Positive Temperature Coefficient）素子と、前記第２面に設けられた電極と、を有し、前記ＰＴＣ素子は、前記第１面の外周部分を取り囲むように前記第１面に設けられているとともに、前記電極と直列に接続されており、前記電極は、その一部分が前記第１面における前記ＰＴＣ素子の位置と重なるように前記第２面に設けられている。 A planar heating element according to an aspect of the present disclosure includes an insulating sheet having a first surface and a second surface that is the back surface thereof, a PTC (Positive Temperature Coefficient) element provided on the first surface, and an electrode provided on the second surface, wherein the PTC element is provided on the first surface so as to surround the outer peripheral portion of the first surface and is connected in series with the electrode. The electrode is provided on the second surface so that a portion of the electrode overlaps the position of the PTC element on the first surface.

本開示によれば、温度制御の効率を向上させることができる。 According to the present disclosure, the efficiency of temperature control can be improved.

本開示の実施の形態１に係る面状発熱体の第１面を示す正面図FIG. 1 is a front view showing a first surface of a planar heating element according to Embodiment 1 of the present disclosure; 本開示の実施の形態１に係る面状発熱体の第２面を示す正面図Front view showing the second surface of the planar heating element according to Embodiment 1 of the present disclosure 本開示の実施の形態１に係る面状発熱体の第１面に第２面を重ねて示す正面図FIG. 2 is a front view showing the second surface superimposed on the first surface of the planar heating element according to the first embodiment of the present disclosure; 本開示の実施の形態２に係る面状発熱体の第２面を示す正面図Front view showing the second surface of the planar heating element according to the second embodiment of the present disclosure 本開示の実施の形態２に係る面状発熱体の第１面に第２面を重ねて示す正面図Front view showing the second surface superimposed on the first surface of the planar heating element according to the second embodiment of the present disclosure 本開示の実施の形態３に係る面状発熱体の第２面を示す正面図Front view showing the second surface of the planar heating element according to the third embodiment of the present disclosure 本開示の実施の形態３に係る面状発熱体の第１面に第２面を重ねて示す正面図Front view showing the second surface superimposed on the first surface of the planar heating element according to the third embodiment of the present disclosure

以下、本開示の実施の形態１～３に係る面状発熱体１００について、図１～図７を参照しながら説明する。なお、各図において共通する構成要素については同一の符号を付し、それらの説明は適宜省略する。 Sheet heating elements 100 according to Embodiments 1 to 3 of the present disclosure will be described below with reference to FIGS. 1 to 7. FIG. In addition, the same code|symbol is attached|subjected about the component which is common in each figure, and those description is abbreviate|omitted suitably.

（実施の形態１）
実施の形態１に係る面状発熱体１００について、図１～図３を参照して説明する。図１は、実施の形態１に係る面状発熱体１００の第１面を示す正面図である。図２は、実施の形態１に係る面状発熱体１００の第２面を示す正面図である。図３は、図１に示す第１面に図２に示す第２面を重ねて示す正面図である。 (Embodiment 1)
A sheet heating element 100 according to Embodiment 1 will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 is a front view showing the first surface of a planar heating element 100 according to Embodiment 1. FIG. FIG. 2 is a front view showing the second surface of the planar heating element 100 according to Embodiment 1. FIG. 3 is a front view showing the second surface shown in FIG. 2 superimposed on the first surface shown in FIG. 1. FIG.

図１～図３に示すように、面状発熱体１００は、電気的な絶縁性を有する基材として、絶縁シート１を有する。絶縁シート１は、平面状の部材であり、第１面と、その裏面である第２面とを有する。 As shown in FIGS. 1 to 3, the planar heating element 100 has an insulating sheet 1 as an electrically insulating base material. The insulating sheet 1 is a planar member, and has a first surface and a second surface, which is the rear surface of the first surface.

また、図１～図３に示すように、面状発熱体１００は、電極２～４、ＰＴＣ（Positive Temperature Coefficient）素子５、端子６～９、および電極１１を有する。 1 to 3, the planar heating element 100 has electrodes 2 to 4, a PTC (Positive Temperature Coefficient) element 5, terminals 6 to 9, and an electrode 11. FIG.

図１に示すように、面状発熱体１００の第１面（具体的には、絶縁シート１の第１面）には、電極２～４と、ＰＴＣ素子（ＰＴＣ抵抗体と言ってもよい）５とが設けられている。 As shown in FIG. 1, the first surface of the planar heating element 100 (specifically, the first surface of the insulating sheet 1) has electrodes 2 to 4 and a PTC element (PTC resistor). ) 5 are provided.

一方、図２に示すように、面状発熱体１００の第２面（具体的には、絶縁シート１の第２面）には、電極１１が設けられている。 On the other hand, as shown in FIG. 2, an electrode 11 is provided on the second surface of the planar heating element 100 (specifically, the second surface of the insulating sheet 1).

ＰＴＣ素子５は、自己温度制御機能（所定の温度になった場合に、抵抗値が増加することで電流が制限される機能）を備えた素子である。ＰＴＣ素子５は、図１、図３に示すように、絶縁シート１の外周部分を取り囲むように（言い換えると、絶縁シート１の外周に沿って）設けられている。 The PTC element 5 is an element having a self-temperature control function (a function of limiting the current by increasing the resistance value when the temperature reaches a predetermined temperature). As shown in FIGS. 1 and 3, the PTC element 5 is provided so as to surround the outer peripheral portion of the insulating sheet 1 (in other words, along the outer periphery of the insulating sheet 1).

電極２～４は、図１、図３に示すように、互いに離間して設けられている。これにより、電極２～４では、電気的絶縁性が確保されている。 The electrodes 2 to 4 are spaced apart from each other as shown in FIGS. As a result, the electrodes 2 to 4 are electrically insulated.

また、図１、図３に示すように、電極２～４には、それぞれ、端子６、端子７～８、端子９が設けられている。これらの端子６～９は、絶縁シート１の第１面側と第２面側とを導通させるための導電部材である。 As shown in FIGS. 1 and 3, the electrodes 2-4 are provided with terminals 6, 7-8, and 9, respectively. These terminals 6 to 9 are conductive members for conducting the first surface side and the second surface side of the insulating sheet 1 .

端子６は、電極２および絶縁シート１を貫通して設けられている。端子６の第１面側には、図示しないリード線が接続される。 A terminal 6 is provided through the electrode 2 and the insulating sheet 1 . A lead wire (not shown) is connected to the first surface side of the terminal 6 .

端子７、８は、それぞれ、電極３および絶縁シート１を貫通して設けられている。端子８は、図２、図３に示すように、第２面側において電極１１と導通する。端子７の第１面側には、図示しないリード線が接続される。 The terminals 7 and 8 are provided through the electrode 3 and the insulating sheet 1, respectively. The terminal 8 is electrically connected to the electrode 11 on the second surface side, as shown in FIGS. A lead wire (not shown) is connected to the first surface side of the terminal 7 .

端子９は、電極４および絶縁シート１を貫通して設けられている。端子９は、図２、図３に示すように、第２面側において電極１１と導通する。 A terminal 9 is provided so as to penetrate the electrode 4 and the insulating sheet 1 . The terminal 9 is electrically connected to the electrode 11 on the second surface side, as shown in FIGS.

また、図示は省略しているが、電極２、４は、それぞれ、ＰＴＣ素子５と絶縁シート１との間に、櫛歯形状部を有する。櫛歯形状部の輪郭の形状は、図１に示したＰＴＣ素子５の形状とほぼ同じである。すなわち、櫛歯形状部は、絶縁シート１の外周部分を取り囲むように（言い換えると、絶縁シート１の外周に沿って）設けられている。 Also, although not shown, the electrodes 2 and 4 each have a comb-shaped portion between the PTC element 5 and the insulating sheet 1 . The shape of the contour of the comb tooth-shaped portion is substantially the same as the shape of the PTC element 5 shown in FIG. That is, the comb tooth-shaped portion is provided so as to surround the outer peripheral portion of the insulating sheet 1 (in other words, along the outer periphery of the insulating sheet 1).

具体的には、電極２の櫛歯形状部は、互いに離間して並列に配置された複数の櫛歯を含み、それらが絶縁シート１の外周部分を取り囲むように設けられている。そして、複数の櫛歯の先端は、電極４に接触することなく、その近傍に配置されている。同様に、電極４の櫛歯形状部は、互いに離間して並列に配置された複数の櫛歯を含み、それらは、絶縁シート１の外周部分を取り囲むように設けられている。そして、複数の櫛歯の先端は、電極２に接触することなく、その近傍に配置されている。また、電極２における複数の櫛歯と、電極４における複数の櫛歯とは、互いに接触しないように、組み合っている。ＰＴＣ素子５は、このように互いに組み合った電極２、４それぞれの櫛歯形状部の上に設けられている。 Specifically, the comb tooth-shaped portion of the electrode 2 includes a plurality of comb teeth spaced apart from each other and arranged in parallel so as to surround the outer peripheral portion of the insulating sheet 1 . The tips of the plurality of comb teeth are arranged in the vicinity of the electrode 4 without being in contact therewith. Similarly, the comb tooth-shaped portion of the electrode 4 includes a plurality of comb teeth spaced apart from each other and arranged in parallel so as to surround the outer peripheral portion of the insulating sheet 1 . The tips of the plurality of comb teeth are arranged in the vicinity of the electrode 2 without contacting it. Moreover, the plurality of comb teeth of the electrode 2 and the plurality of comb teeth of the electrode 4 are combined so as not to come into contact with each other. The PTC element 5 is provided on each of the comb-shaped portions of the electrodes 2 and 4 thus interlocked with each other.

電極１１は、線状電極である。図２、図３に示すように、電極１１の一端は、端子８に接続されており、電極１１の他端は端子９に接続されている。また、電極１１の大部分は、つづら折り状である。 Electrode 11 is a linear electrode. As shown in FIGS. 2 and 3, one end of electrode 11 is connected to terminal 8 and the other end of electrode 11 is connected to terminal 9 . Also, most of the electrode 11 is zigzagging.

また、図３に示すように、電極１１は、その一部分が、第１面に設けられたＰＴＣ素子５の位置と重なるように、第２面に設けられる。また、図３に示すように、電極１１は、その大部分が、第１面に設けられたＰＴＣ素子５の内側（ＰＴＣ素子５により囲まれた領域）に位置するように、第２面に設けられる。 Also, as shown in FIG. 3, the electrode 11 is provided on the second surface so that a portion of the electrode 11 overlaps the position of the PTC element 5 provided on the first surface. Moreover, as shown in FIG. 3, the electrode 11 is arranged on the second surface so that most of the electrode 11 is located inside the PTC element 5 provided on the first surface (the area surrounded by the PTC element 5). be provided.

電極１１は、例えば、予めパターン形成された金属線を絶縁シート１上に配置したものでもよいし、絶縁シート１１上に配置された金属層をエッチングや刃型等によりパターン形成したものであってもよい。 The electrode 11 may be, for example, a pre-patterned metal wire disposed on the insulating sheet 1, or a metal layer disposed on the insulating sheet 11 patterned by etching, cutting, or the like. good too.

次に、上述のように構成された面状発熱体１００における電流の流れについて説明する。なお、ここでは、電流の入力端が端子７であり、電流の出力端が端子６である場合を例に挙げて説明する。 Next, the current flow in the planar heating element 100 configured as described above will be described. Here, a case where the current input terminal is the terminal 7 and the current output terminal is the terminal 6 will be described as an example.

端子７の第１面側に接続されたリード線（図示略）から端子７に流れ込んだ電流は、第１面において、電極３を介して端子８に到達する。 A current flowing into the terminal 7 from a lead wire (not shown) connected to the first surface side of the terminal 7 reaches the terminal 8 via the electrode 3 on the first surface.

次に、端子８を経た電流は、第２面において、電極１１を流れ、端子９に到達する。この通電により、電極１１は発熱する。 Next, the current through terminal 8 flows through electrode 11 and reaches terminal 9 on the second surface. This energization causes the electrode 11 to generate heat.

次に、端子９を経た電流は、第１面において、電極４、ＰＴＣ素子５、電極２を順に流れ、端子６に到達する。この通電により、ＰＴＣ素子５は、自己温度制御を行う発熱体として動作する。そして、電流は、端子６の第１面側に接続されたリード線（図示略）へ流入する。 Next, the current that has passed through the terminal 9 flows through the electrode 4 , the PTC element 5 and the electrode 2 in order on the first surface and reaches the terminal 6 . This energization causes the PTC element 5 to operate as a heating element that performs self-temperature control. Then, the current flows into a lead wire (not shown) connected to the first surface side of the terminal 6 .

このような電流の流れから、ＰＴＣ素子５は、電極１１と直列に接続されていると言うことができる。 From such current flow, it can be said that the PTC element 5 is connected in series with the electrode 11 .

なお、電流の入力端および出力端をそれぞれ端子６、７としてもよい。その場合、電流は、上述した順とは逆に流れる。 It should be noted that the terminals 6 and 7 may be used as the input end and the output end of the current, respectively. In that case, the current flows in the opposite order as described above.

（実施の形態２）
実施の形態２に係る面状発熱体１００について、図４、図５を参照して説明する。図４は、実施の形態２に係る面状発熱体１００の第２面を示す正面図である。図５は、図１に示す第１面に図４に示す第２面を重ねて示す正面図である。 (Embodiment 2)
A planar heating element 100 according to Embodiment 2 will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a front view showing the second surface of the planar heating element 100 according to the second embodiment. 5 is a front view showing the second surface shown in FIG. 4 superimposed on the first surface shown in FIG. 1. FIG.

実施の形態２に係る面状発熱体１００の第１面は、実施の形態１（図１参照）と同じであるので、ここでの説明は省略する。 Since the first surface of the planar heating element 100 according to Embodiment 2 is the same as that of Embodiment 1 (see FIG. 1), description thereof will be omitted here.

図４に示すように、面状発熱体１００の第２面には、帯状電極１２ａ、１２ｂ、および線状電極１２ｃを含む電極１２が設けられている。 As shown in FIG. 4, the second surface of the planar heating element 100 is provided with electrodes 12 including strip electrodes 12a and 12b and linear electrodes 12c.

帯状電極１２ａの一端は、端子８に接続されている。また、帯状電極１２ａの一部分は、第２面の右辺に沿って設けられている。 One end of the strip electrode 12 a is connected to the terminal 8 . A portion of the strip-shaped electrode 12a is provided along the right side of the second surface.

帯状電極１２ｂの一端は、端子９に接続されている。また、帯状電極１２ｂの一部分は、第２面の左辺に沿って設けられている。 One end of the strip electrode 12 b is connected to the terminal 9 . A portion of the strip-shaped electrode 12b is provided along the left side of the second surface.

線状電極１２ｃは、つづら折り状に形成された３つの部分（以下、つづら折り部という）を含む。各つづら折り部において、一端は帯状電極１２ａに接続され、他端は帯状電極１２ｂに接続されている。 The linear electrode 12c includes three parts formed in a zigzag shape (hereinafter referred to as zigzag parts). In each zigzag portion, one end is connected to the strip electrode 12a and the other end is connected to the strip electrode 12b.

電極１２は、例えば、導電性ペースト（例えば、銅ペーストまたは銀ペースト）を絶縁シート１上に印刷（例えば、スクリーン印刷）することでパターン形成したものであるが、これに限定されず、その他の方法で形成されたものであってもよい。 The electrodes 12 are patterned by, for example, printing (e.g., screen printing) a conductive paste (e.g., copper paste or silver paste) on the insulating sheet 1, but are not limited thereto. It may be formed by a method.

また、図５に示すように、電極１２は、その一部分（例えば、線状電極１２ｃの一部分）が、第１面に設けられたＰＴＣ素子５の位置と重なるように、第２面に設けられる。また、図５に示すように、電極１２は、その大部分（例えば、線状電極１２ｃの大部分）が、第１面に設けられたＰＴＣ素子５の内側（ＰＴＣ素子５により囲まれた領域）に位置するように、第２面に設けられる。 Further, as shown in FIG. 5, the electrode 12 is provided on the second surface such that a portion thereof (for example, a portion of the linear electrode 12c) overlaps the position of the PTC element 5 provided on the first surface. . Further, as shown in FIG. 5, most of the electrode 12 (for example, most of the linear electrode 12c) is inside the PTC element 5 provided on the first surface (the area surrounded by the PTC element 5). ) is provided on the second surface.

次に、上述のように構成された面状発熱体１００における電流の流れについて説明する。なお、ここでは、電流の入力端が端子７であり、電流の出力端が端子６である場合を例に挙げて説明する。 Next, the current flow in the planar heating element 100 configured as described above will be described. Here, a case where the current input terminal is the terminal 7 and the current output terminal is the terminal 6 will be described as an example.

端子７の第１面側に接続されたリード線（図示略）から端子７に流れ込んだ電流は、第１面において、電極３を介して端子８に到達する。 A current flowing into the terminal 7 from a lead wire (not shown) connected to the first surface side of the terminal 7 reaches the terminal 8 via the electrode 3 on the first surface.

次に、端子８を経た電流は、第２面において、電極１２ａ、１２ｃ、１２ｂを順に流れ、端子９に到達する。この通電により、電極１２は発熱する。 Next, the current that has passed through the terminal 8 flows sequentially through the electrodes 12a, 12c, and 12b on the second surface and reaches the terminal 9. FIG. This energization causes the electrode 12 to generate heat.

次に、端子９を経た電流は、第１面において、電極４、ＰＴＣ素子５、電極２を順に流れ、端子６に到達する。この通電により、ＰＴＣ素子５は、自己温度制御を行う発熱体として動作する。そして、電流は、端子６の第１面側に接続されたリード線（図示略）へ流入する。 Next, the current that has passed through the terminal 9 flows through the electrode 4 , the PTC element 5 and the electrode 2 in order on the first surface and reaches the terminal 6 . This energization causes the PTC element 5 to operate as a heating element that performs self-temperature control. Then, the current flows into a lead wire (not shown) connected to the first surface side of the terminal 6 .

このような電流の流れから、ＰＴＣ素子５は、電極１２と直列に接続されていると言うことができる。 From such current flow, it can be said that the PTC element 5 is connected in series with the electrode 12 .

なお、電流の入力端および出力端をそれぞれ端子６、７としてもよい。その場合、電流は、上述した順とは逆に流れる。 It should be noted that the terminals 6 and 7 may be used as the input end and the output end of the current, respectively. In that case, the current flows in the opposite order as described above.

（実施の形態３）
実施の形態３に係る面状発熱体１００について、図６、図７を参照して説明する。図６は、実施の形態３に係る面状発熱体１００の第２面を示す正面図である。図７は、図１に示す第１面に図６に示す第２面を重ねて示す正面図である。 (Embodiment 3)
A planar heating element 100 according to Embodiment 3 will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a front view showing the second surface of the planar heating element 100 according to the third embodiment. 7 is a front view showing the second surface shown in FIG. 6 superimposed on the first surface shown in FIG. 1. FIG.

実施の形態３に係る面状発熱体１００の第１面は、実施の形態１（図１参照）と同じであるので、ここでの説明は省略する。なお、本実施の形態では、透明電極１３を用いるため、絶縁シート１も透明の部材を用いることが好ましい。 Since the first surface of the planar heating element 100 according to Embodiment 3 is the same as that of Embodiment 1 (see FIG. 1), description thereof will be omitted here. Since the transparent electrode 13 is used in this embodiment, it is preferable to use a transparent member for the insulating sheet 1 as well.

図６に示すように、面状発熱体１００の第２面には、透明電極１３および帯状電極１４、１５が設けられている。 As shown in FIG. 6, a transparent electrode 13 and strip electrodes 14 and 15 are provided on the second surface of the planar heating element 100 .

透明電極１３は、絶縁シート１の第２面のほぼ全体（第２面の下方部分を除く）に設けられている。透明電極１３としては、例えば、ＡＧ（銀）膜またはＩＴＯ(酸化インジウム・スズ)膜等が挙げられるが、これらに限定されない。 The transparent electrode 13 is provided on substantially the entire second surface of the insulating sheet 1 (excluding the lower portion of the second surface). Examples of the transparent electrode 13 include, but are not limited to, an AG (silver) film or an ITO (indium tin oxide) film.

帯状電極１４の一端は、端子８に接続されている。また、帯状電極１４の一部分は、第２面の右辺に沿って、かつ、透明電極１３に接して設けられている。 One end of the strip electrode 14 is connected to the terminal 8 . A portion of the strip-shaped electrode 14 is provided along the right side of the second surface and in contact with the transparent electrode 13 .

帯状電極１５の一端は、端子９に接続されている。また、帯状電極１５の一部分は、第２面の左辺に沿って、かつ、透明電極１３に接して設けられている。 One end of the strip electrode 15 is connected to the terminal 9 . A portion of the strip-shaped electrode 15 is provided along the left side of the second surface and in contact with the transparent electrode 13 .

また、透明電極１３は、第２面のほぼ全体に設けられているため、図７に示すように、透明電極１３の一部分は、第１面に設けられたＰＴＣ素子５の位置と重なっている。また、図７に示すように、透明電極１３は、その大部分が、第１面に設けられたＰＴＣ素子５の内側（ＰＴＣ素子５により囲まれた領域）に位置するように、第２面に設けられる。 In addition, since the transparent electrode 13 is provided almost entirely on the second surface, as shown in FIG. 7, a portion of the transparent electrode 13 overlaps the position of the PTC element 5 provided on the first surface. . Further, as shown in FIG. 7, the second surface of the transparent electrode 13 is arranged such that most of the transparent electrode 13 is located inside the PTC element 5 provided on the first surface (the area surrounded by the PTC element 5). provided in

次に、上述のように構成された面状発熱体１００における電流の流れについて説明する。なお、ここでは、電流の入力端が端子７であり、電流の出力端が端子６である場合を例に挙げて説明する。 Next, the current flow in the planar heating element 100 configured as described above will be described. Here, a case where the current input terminal is the terminal 7 and the current output terminal is the terminal 6 will be described as an example.

端子７の第１面側に接続されたリード線（図示略）から端子７に流れ込んだ電流は、第１面において、電極３を介して端子８に到達する。 A current flowing into the terminal 7 from a lead wire (not shown) connected to the first surface side of the terminal 7 reaches the terminal 8 via the electrode 3 on the first surface.

次に、端子８を経た電流は、第２面において、電極１４、透明電極１３、電極１５を順に流れ、端子９に到達する。この通電により、透明電極１３は発熱する。 Next, the current that has passed through the terminal 8 flows through the electrode 14 , the transparent electrode 13 and the electrode 15 in order on the second surface and reaches the terminal 9 . This energization causes the transparent electrode 13 to generate heat.

次に、端子９を経た電流は、第１面において、電極４、ＰＴＣ素子５、電極２を順に流れ、端子６に到達する。この通電により、ＰＴＣ素子５は、自己温度制御を行う発熱体として動作する。そして、電流は、端子６の第１面側に接続されたリード線（図示略）へ流入する。 Next, the current that has passed through the terminal 9 flows through the electrode 4 , the PTC element 5 and the electrode 2 in order on the first surface and reaches the terminal 6 . This energization causes the PTC element 5 to operate as a heating element that performs self-temperature control. Then, the current flows into a lead wire (not shown) connected to the first surface side of the terminal 6 .

このような電流の流れから、ＰＴＣ素子５は、透明電極１３および電極１４、１５と直列に接続されていると言うことができる。 From such current flow, it can be said that the PTC element 5 is connected in series with the transparent electrode 13 and the electrodes 14 and 15 .

なお、電流の入力端および出力端をそれぞれ端子６、７としてもよい。その場合、電流は、上述した順とは逆に流れる。 It should be noted that the terminals 6 and 7 may be used as the input end and the output end of the current, respectively. In that case, the current flows in the opposite order as described above.

実施の形態３に係る面状発熱体１００は、例えば、両面テープにより、光学装置の透明部材（例えば、撮像素子の前方に設けられる保護ガラス等）に取り付けられる。光学装置としては、例えば、車両の周辺の状況を検知する車載カメラ（衝突防止カメラと言ってもよい）、建物等に取り付けられる監視カメラ、車載電子ドアミラー等が挙げられるが、これらに限定されない。なお、面状発熱体１００は、光学装置以外に設けられる透明部材（例えば、車両のガラス窓等）に取り付けられてもよい。 The planar heating element 100 according to Embodiment 3 is attached to a transparent member of an optical device (for example, protective glass or the like provided in front of an imaging device) with, for example, double-sided tape. Examples of the optical device include, but are not limited to, an in-vehicle camera that detects the surroundings of the vehicle (can be called a collision prevention camera), a surveillance camera attached to a building, an in-vehicle electronic door mirror, and the like. Note that the planar heating element 100 may be attached to a transparent member (for example, a glass window of a vehicle, etc.) other than the optical device.

以上、実施の形態１～３に係る面状発熱体１００について説明した。以下、実施の形態１～３に係る面状発熱体１００の作用効果についてまとめる。 The sheet heating elements 100 according to the first to third embodiments have been described above. The effects of the planar heating elements 100 according to Embodiments 1 to 3 are summarized below.

本実施の形態に係る面状発熱体１００は、第１面と、その裏面である第２面とを備えた絶縁シート１と、第１面に設けられたＰＴＣ素子５と、第２面に設けられた電極１１（実施の形態２では電極１２、実施の形態３では透明電極１３。以下同様）と、を有し、ＰＴＣ素子５は、第１面の外周部分を取り囲むように第１面に設けられているとともに、電極１１と直列に接続されており、電極１１は、その一部分が第１面におけるＰＴＣ素子５の位置と重なるように第２面に設けられていることを特徴とする。 A planar heating element 100 according to the present embodiment includes an insulating sheet 1 having a first surface and a second surface which is the back surface thereof, a PTC element 5 provided on the first surface, and a The PTC element 5 has an electrode 11 (electrode 12 in Embodiment 2, transparent electrode 13 in Embodiment 3, the same applies hereinafter) provided on the first surface so as to surround the outer peripheral portion of the first surface. and is connected in series with the electrode 11, and the electrode 11 is provided on the second surface so that a portion of the electrode 11 overlaps the position of the PTC element 5 on the first surface. .

すなわち、本実施の形態の面状発熱体１００では、ＰＴＣ素子５が第１面の外周部分を取り囲むように第１面に設けられているため、面状発熱体１００（具体的には、絶縁シート１）の全面に亘って満遍なく（言い換えれば、ムラ無く）温度制御を行うことができる。したがって、温度制御の効率を向上させることができる。 That is, in the planar heating element 100 of the present embodiment, the PTC element 5 is provided on the first surface so as to surround the outer peripheral portion of the first surface. Temperature control can be performed evenly (in other words, evenly) over the entire surface of the sheet 1). Therefore, the efficiency of temperature control can be improved.

また、本実施の形態の面状発熱体１００では、ＰＴＣ素子５と電極１１とが直列に接続されているため、電極１１における温度制御をより精度良く実現することができる。 Further, in the planar heating element 100 of the present embodiment, the PTC element 5 and the electrode 11 are connected in series, so the temperature control of the electrode 11 can be achieved with higher accuracy.

また、本実施の形態の面状発熱体１００では、電極１１は、その一部分が第１面におけるＰＴＣ素子５の位置と重なるように第２面に設けられているため、電極１１の温度が迅速にＰＴＣ素子５に伝わるため、電極１１における温度制御をより精度良く実現することができる。 Further, in the planar heating element 100 of the present embodiment, the electrode 11 is provided on the second surface so that a portion of the electrode 11 overlaps the position of the PTC element 5 on the first surface. , the temperature of the electrode 11 can be controlled with higher accuracy.

なお、本開示は、上記実施の形態１～３の説明に限定されず、その趣旨を逸脱しない範囲において種々の変形が可能である。 It should be noted that the present disclosure is not limited to the description of Embodiments 1 to 3 above, and various modifications are possible without departing from the scope of the present disclosure.

本開示の面状発熱体は、平面状の基材に電極とＰＴＣ素子とが設けられた面状発熱体に有用である。 The planar heating element of the present disclosure is useful as a planar heating element in which electrodes and PTC elements are provided on a planar substrate.

１ 絶縁シート
２、３、４ 電極
５ ＰＴＣ素子
６、７、８、９ 端子
１１、１２ 電極
１２ａ、１２ｂ 帯状電極
１２ｃ 線状電極
１３ 透明電極
１４、１５ 帯状電極
１００ 面状発熱体 Reference Signs List 1 insulating sheet 2, 3, 4 electrode 5 PTC element 6, 7, 8, 9 terminal 11, 12 electrode 12a, 12b strip electrode 12c linear electrode 13 transparent electrode 14, 15 strip electrode 100 planar heating element

Claims (5)

第１面と、その裏面である第２面とを備えた絶縁シートと、
前記第１面に設けられたＰＴＣ（Positive Temperature Coefficient）素子と、
前記第２面に設けられた電極と、を有し、
前記ＰＴＣ素子は、前記第１面の外周部分を取り囲むように前記第１面に設けられているとともに、前記電極と直列に接続されており、
前記電極は、その一部分が前記第１面における前記ＰＴＣ素子の位置と重なるように前記第２面に設けられている、
面状発熱体。 an insulating sheet having a first surface and a second surface that is the back surface thereof;
a PTC (Positive Temperature Coefficient) element provided on the first surface;
an electrode provided on the second surface;
The PTC element is provided on the first surface so as to surround the outer peripheral portion of the first surface and is connected in series with the electrode,
The electrode is provided on the second surface so that a portion of the electrode overlaps the position of the PTC element on the first surface.
Planar heating element. 前記電極は、その大部分が前記第１面における前記ＰＴＣ素子の内側に位置するように前記第２面に設けられている、
請求項１に記載の面状発熱体。 The electrode is provided on the second surface such that most of the electrode is located inside the PTC element on the first surface.
The planar heating element according to claim 1. 前記電極は、線状電極および帯状電極のうち少なくとも一方を含む、
請求項１または２に記載の面状発熱体。 The electrodes include at least one of a linear electrode and a strip-shaped electrode,
The planar heating element according to claim 1 or 2. 前記線状電極または前記帯状電極は、つづら折り状である、
請求項３に記載の面状発熱体。 The linear electrode or the strip electrode has a serpentine shape,
The planar heating element according to claim 3. 前記電極は、前記第２面に設けられた透明電極である、
請求項１または２に記載の面状発熱体。 The electrode is a transparent electrode provided on the second surface,
The planar heating element according to claim 1 or 2.
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