JPS631421Y2 - - Google Patents
Info
- Publication number
- JPS631421Y2 JPS631421Y2 JP18992180U JP18992180U JPS631421Y2 JP S631421 Y2 JPS631421 Y2 JP S631421Y2 JP 18992180 U JP18992180 U JP 18992180U JP 18992180 U JP18992180 U JP 18992180U JP S631421 Y2 JPS631421 Y2 JP S631421Y2
- Authority
- JP
- Japan
- Prior art keywords
- coefficient thermistor
- heat generating
- temperature coefficient
- generating device
- insulator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 16
- 239000012212 insulator Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 description 8
- 230000005494 condensation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000020169 heat generation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- LTPBRCUWZOMYOC-UHFFFAOYSA-N Beryllium oxide Chemical compound O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Resistance Heating (AREA)
Description
【考案の詳細な説明】
本考案は、正の抵抗温度特性を有するチタン酸
バリウム系半導体磁器発熱体（以下正特性サーミ
スタと称す）を使用した発熱装置は、たとえばビ
デオテープレコーダ（以下VTRと称す）の回転
ヘツドの結露現象を防止するのに使用される発熱
装置に関する。[Detailed description of the invention] The present invention provides a heat generating device using a barium titanate semiconductor ceramic heating element (hereinafter referred to as a positive temperature coefficient thermistor) having a positive resistance-temperature characteristic, for example, a video tape recorder (hereinafter referred to as a VTR). ) relates to a heat generating device used to prevent condensation on a rotating head.
VTRは、録画、再生動作時に周辺機器からの
放熱や自己の発熱現象により、回転ヘツドがかな
りの温度上昇を示す。ところが一担動作を停止す
ると、回転ヘツドドラムの温度が急激に低下する
ため、回転ヘツドドラムの表面に細かい水滴が付
着するいわゆる結露現象を生じる。この結露現象
により、磁気テープが回転ヘツドドラムの表面に
密着してしまうため、次に使用するときに回転ヘ
ツドドラムが円滑に始動できなかつたり、最悪の
場合には磁気テープが破断してしまう虞れもあ
る。 During recording and playback operations, the rotating head of a VTR exhibits a considerable temperature rise due to heat dissipation from peripheral devices and its own heat generation phenomenon. However, once the operation is stopped, the temperature of the rotary head drum drops rapidly, resulting in a so-called dew condensation phenomenon in which fine water droplets adhere to the surface of the rotary head drum. This condensation phenomenon causes the magnetic tape to adhere tightly to the surface of the rotating head drum, which may prevent the rotating head drum from starting smoothly the next time it is used, or in the worst case, may cause the magnetic tape to break. be.
上述の結露現象を防止するため、従来は抵抗発
熱体と感温スイツチとを組合せたオン，オフ制御
形の発熱装置により、回転ヘツドドラムを動作停
止後も適当な温度に保温させるようにしてあつ
た。しかしながら、抵抗発熱体と感温スイツチと
の組合せより成る発熱装置は、部品点数が多く、
広い取付スペースを要すること、感温スイツチが
故障し易く信頼性に欠けること、周期的な温度変
動が避けられないこと、消費電力が大きいこと
等々の欠点があることから、最近、発熱体として
正特性サーミスタを用いた発熱装置が提案されて
いる。 In order to prevent the above-mentioned dew condensation phenomenon, conventionally, an on/off control type heating device that combines a resistance heating element and a temperature-sensitive switch has been used to keep the rotating head drum at an appropriate temperature even after the operation has stopped. . However, a heating device consisting of a combination of a resistance heating element and a temperature-sensitive switch has a large number of parts.
Due to the disadvantages of large installation spaces, temperature-sensitive switches that are prone to failure and lack of reliability, unavoidable periodic temperature fluctuations, and high power consumption, they have recently become less popular as heating elements. Heat generating devices using characteristic thermistors have been proposed.
正特性サーミスタは、キユリー温度を適当に選
定することにより、任意の発熱温度が得られるこ
と、また温度がキユリー点を超えると抵抗値が急
激に増加して電流を絞る自己温度制御機能を有し
それ自体で過熱の危険のない定温発熱体として動
作すること等々の優れた特徴を有している。従つ
て、この正特性サーミスタを使用して発熱装置を
構成することにより、感温素子や開閉素子等が不
要となり、小型化、取付スペースの縮小化、温度
の一定化、過熱防止、消費電力の節約、信頼性の
向上等の効果が得られる。 A positive temperature coefficient thermistor has a self-temperature control function that allows you to obtain any heat generation temperature by appropriately selecting the Curie temperature, and that when the temperature exceeds the Curie point, the resistance value rapidly increases and the current is reduced. It has excellent features such as operating as a constant temperature heating element without risk of overheating by itself. Therefore, by configuring a heat generating device using this positive temperature coefficient thermistor, there is no need for a temperature sensing element or switching element, etc., resulting in miniaturization, reduction of installation space, constant temperature, prevention of overheating, and reduction of power consumption. Effects such as savings and improved reliability can be obtained.
第１図は此種の発熱装置の分解斜視図、第２図
は同じくその組立断面図をそれぞれ示している。
この例では、回転ヘツドドラムを支持する支持部
材（図示しない）等に取付けられる金属板材より
成る放熱板１の外面に、モールド樹脂流出防止用
の凸環部２を形成し、該凸環部２の内部に、熱伝
導性の良好な耐熱電気絶縁材料、たとえばアルミ
ナ磁器、ベリリア磁器等から成る絶縁板３および
正特性サーミスタ４を順次重ねて挿入し、かつ接
着した後、正特性サーミスタ４の上からモールド
樹脂５をコーテイングした構造となつている。 FIG. 1 is an exploded perspective view of this type of heat generating device, and FIG. 2 is an assembled sectional view thereof.
In this example, a convex ring part 2 for preventing the mold resin from flowing out is formed on the outer surface of a heat sink plate 1 made of a metal plate material that is attached to a support member (not shown) that supports a rotating head drum. An insulating plate 3 made of a heat-resistant electrical insulating material with good thermal conductivity, such as alumina porcelain or beryllia porcelain, and a positive temperature coefficient thermistor 4 are sequentially inserted and bonded therein. It has a structure coated with mold resin 5.
前記正特性サーミスタ４は、円板状の素体６の
取付面側に中間電極７を形成すると共に、他面側
にギヤツプg1を隔てて対向する２つの電極８ａ，
８ｂを形成し、該電極８ａ，８ｂにリード線９
ａ，９ｂを半田付け等の手段で接続固定した構造
となつている。１０ａ，１０ｂは放熱板１を回転
ヘツドドラムの支持部材等に取付固定する場合
に、ネジ等の取付具を嵌める切欠である。 The positive temperature coefficient thermistor 4 has an intermediate electrode 7 formed on the mounting surface side of a disk-shaped element body 6, and two electrodes 8a facing each other with a gap g 1 on the other surface side.
8b, and lead wires 9 are connected to the electrodes 8a, 8b.
The structure is such that a and 9b are connected and fixed by means such as soldering. Reference numerals 10a and 10b are notches into which fixing tools such as screws are fitted when the heat dissipation plate 1 is attached and fixed to a support member of a rotary head drum or the like.
上述の発熱装置は、前述した如く、中間電極７
に対して他面側に設けた２つの電極８ａ，８ｂを
対向させた構造となつているから、リード線９ａ
−９ｂまたは電極８ａ−８ｂ間の抵抗値は、第３
図に示すように、電極８ａ−中間電極７間および
中間電極７−電極８ｂ間の各々の抵抗値(イ)，(ロ)が
直列合成されたものが主となる。なお、電極８ａ
−８ｂ間の抵抗値(ハ)は表層的な抵抗値であり、上
記の直列合成抵抗値より遥かに小さくなるから無
視できる。正特性サーミスタ４は、前述の抵抗値
(イ)，(ロ)の直列合成抵抗値に従つて発熱動作をす
る。 As mentioned above, the above-mentioned heat generating device has the intermediate electrode 7.
Since it has a structure in which two electrodes 8a and 8b provided on the other side face each other, the lead wire 9a
-9b or the resistance value between electrodes 8a and 8b is the third
As shown in the figure, the resistance values (a) and (b) between the electrode 8a and the intermediate electrode 7 and between the intermediate electrode 7 and the electrode 8b are mainly combined in series. Note that the electrode 8a
The resistance value between -8b (c) is a superficial resistance value and can be ignored because it is much smaller than the series combined resistance value mentioned above. The positive characteristic thermistor 4 has the above-mentioned resistance value.
It generates heat according to the series combined resistance value of (a) and (b).
ところが、抵抗値(イ)，(ロ)を全く同一の値に調整
することは不可能であり、抵抗値(イ)，(ロ)の間に必
ずバラツキを生じるため、リード線９ａ，９ｂを
介して電極８ａ−８ｂ間に電圧を印加し、正特性
サーミスタ４を動作させた場合、抵抗値(イ)，(ロ)の
バラツキにより、電極８ａ−中間電極７間に加わ
る分圧電圧と、中間電極７−電極８ｂ間に加わる
分圧電圧との間に電圧差を生じ、どちらか一方だ
けが集中的に偏つて発熱動作をし、それによつて
正特性サーミスタ全体が熱平衡状態に達してしま
う。このため、理論上は電極８ａ−中間電極７間
および中間電極７−電極８ｂ間の２個所の発熱部
分が考えられても、実際に発熱動作に寄与するの
は正特性サーミスタ４の一部分だけとなつてしま
い、素子の利用効率が低く、安全性に欠ける欠点
があつた。また、リード線９ａ，９ｂを同一面側
で接続固定する構造であるため、たとえばリード
線クリツプ等を使用することができず、リード線
の接続固定作業が面倒で困難になる等、製造上の
難点もあつた。 However, it is impossible to adjust the resistance values (a) and (b) to exactly the same value, and there will always be variations between the resistance values (a) and (b). When a voltage is applied between the electrodes 8a and 8b through the PTC thermistor 4 to operate the positive temperature coefficient thermistor 4, due to variations in the resistance values (a) and (b), the partial voltage applied between the electrode 8a and the intermediate electrode 7, A voltage difference is generated between the partial voltage applied between the intermediate electrode 7 and the electrode 8b, and only one of them generates heat concentratedly, causing the entire positive temperature coefficient thermistor to reach a thermal equilibrium state. . Therefore, even though in theory there are two heat generating parts between the electrode 8a and the intermediate electrode 7 and between the intermediate electrode 7 and the electrode 8b, only a part of the PTC thermistor 4 actually contributes to the heat generating operation. The disadvantages were that the device deteriorated, the efficiency of element utilization was low, and it lacked safety. In addition, since the lead wires 9a and 9b are connected and fixed on the same side, it is not possible to use lead wire clips, etc., and the work of connecting and fixing the lead wires becomes troublesome and difficult. There were also some difficulties.
本考案は上述する欠点を除去し、正特性サーミ
スタの利用効率を高め、小型化もしくは発熱量増
大化を図ると共に、安全性、信頼性を向上させ、
併せて正特性サーミスタと絶縁板との間の密着性
を良好にし、熱伝導性を改善した発熱装置を提供
することを目的とする。 The present invention eliminates the above-mentioned drawbacks, increases the utilization efficiency of the positive temperature coefficient thermistor, reduces the size or increases the amount of heat generated, and improves safety and reliability.
Another object of the present invention is to provide a heat generating device in which the adhesion between the positive temperature coefficient thermistor and the insulating plate is improved, and the thermal conductivity is improved.
上記目的を達成するため、本考案は、放熱板上
に絶縁体を介して正特性サーミスタを取付けた発
熱装置において、前記正特性サーミスタは、両面
に設けた一対の電極にリード線をそれぞれ接続固
定し、該リード線のうち、少なくとも前記絶縁体
と相対する電極に接続固定したリード線は、前記
絶縁体と相対する部分を偏平状に形成したことを
特徴とする。 In order to achieve the above object, the present invention provides a heat generating device in which a positive temperature coefficient thermistor is mounted on a heat sink via an insulator, in which lead wires are connected and fixed to a pair of electrodes provided on both sides of the positive coefficient thermistor. Among the lead wires, at least the lead wire connected and fixed to the electrode facing the insulator is characterized in that a portion facing the insulator is formed in a flat shape.
以下実施例たる添付図面を参照し、本考案の内
容を具体的に説明する。第４図Ａは本考案に係る
発熱装置の分解斜視図、第４図Ｂは同じくその組
立断面図である。図において、第１図および第２
図と同一の参照符号は機能的に同一性ある構成部
分を示している。この実施例では、正特性サーミ
スタ４は、円板状などの任意の形状に形成された
素体６の厚み方向の両面に、一対の電極１１，１
２を設け、該電極１１，１２にリード線１３，１
４を半田付け等の手段によつてそれぞれ接続固定
した構造となつている。このような構造である
と、リード線１３，１４に電圧を印加した場合、
正特性サーミスタ４はそのほぼ全面に亘つて均一
に発熱することとなるから、その利用効率が従来
より著るしく向上し、小型化または発熱量増大の
効果が得られる。また、従来のように、電圧が偏
つて印加される余地がないので、安全性、信頼性
が向上する。更に、リード線１３，１４を接続固
定する際に、リード線クリツプ等を使用すること
が可能となるから、リード線１３，１４の半田付
工程が非常に簡単になり、量産性、生産性が向上
する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be specifically described below with reference to the accompanying drawings, which are examples. FIG. 4A is an exploded perspective view of the heat generating device according to the present invention, and FIG. 4B is an assembled sectional view thereof. In the figure, Figures 1 and 2
The same reference numerals as in the figures indicate functionally identical components. In this embodiment, the positive temperature coefficient thermistor 4 has a pair of electrodes 11, 1 on both sides in the thickness direction of an element body 6 formed in an arbitrary shape such as a disk shape.
2, and lead wires 13, 1 are connected to the electrodes 11, 12.
4 are connected and fixed by means such as soldering. With such a structure, when voltage is applied to the lead wires 13 and 14,
Since the positive temperature coefficient thermistor 4 generates heat uniformly over almost its entire surface, its utilization efficiency is significantly improved compared to the conventional one, and the effect of miniaturization or increased heat generation can be obtained. Furthermore, unlike in the past, there is no room for voltage to be applied unevenly, so safety and reliability are improved. Furthermore, since lead wire clips can be used to connect and fix the lead wires 13 and 14, the soldering process for the lead wires 13 and 14 is greatly simplified, and mass production and productivity are improved. improves.
前記リード線１３，１４のうち、絶縁体３と相
対する電極１２に接続固定したリード線１４は、
絶縁体３と相対する部分１４ａを偏平状に形成し
てある。このような偏平状の部分１４ａを設ける
と、正特性サーミスタ４を絶縁体３上に重ねた場
合に、両者３−４間に生ずる隙間g2が、実際上無
視できる程度の小さな値になるから、両者３，４
の密着性が良好になり、熱伝導性の優れたものが
実現できる。また、この偏平状の部分１４ａがあ
ると、電極１２とリード線１４との接触面積が大
きくなり、電極１２に対するリード線１４の接着
強度が向上する。 Among the lead wires 13 and 14, the lead wire 14 connected and fixed to the electrode 12 facing the insulator 3 is
The portion 14a facing the insulator 3 is formed into a flat shape. By providing such a flat portion 14a, when the PTC thermistor 4 is stacked on the insulator 3, the gap g2 that occurs between the two 3-4 becomes so small that it can be ignored in practice. , both 3, 4
The adhesion is improved and a product with excellent thermal conductivity can be achieved. Furthermore, the presence of this flat portion 14a increases the contact area between the electrode 12 and the lead wire 14, and improves the adhesive strength of the lead wire 14 to the electrode 12.
第５図Ａは正特性サーミスタ４の実施例におけ
る斜視図を示している。この実施例の特徴はリー
ド線１４の偏平状の部分１４ａが、正特性サーミ
スタ素体６の中心の両側に位置するように、例え
ば円弧状に形成したことである。このような構造
であると、当該正特性サーミスタ４を使用して発
熱装置を構成した場合、第５図Ｂに示すように、
正特性サーミスタ４が絶縁板３に対して傾斜する
ことなく平行に取付けられ、しかも偏平状の部分
１４ａによつて囲まれた中央部のギヤツプg3が、
部分１４ａを半田付けしたときの半田で満される
ので、取付安定性および熱結合性が良好になる。 FIG. 5A shows a perspective view of an embodiment of the positive temperature coefficient thermistor 4. FIG. A feature of this embodiment is that the flattened portions 14a of the lead wire 14 are formed in, for example, an arc shape so as to be located on both sides of the center of the PTC thermistor body 6. With such a structure, when a heat generating device is constructed using the PTC thermistor 4, as shown in FIG. 5B,
The positive temperature coefficient thermistor 4 is mounted parallel to the insulating plate 3 without being inclined, and the gap g3 at the center surrounded by the flat portion 14a is
Since it is filled with the solder when the portion 14a is soldered, the mounting stability and thermal bonding properties are improved.
なお、リード線１４を断面円形等のリード線材
によつて構成した場合には、前記部分１４ａはプ
レス加工等の手段でリード線材を押潰して形成す
ることとなるが、リード線１４を板材によつて構
成した場合には、このようなプレス加工工程が不
要となる。また、実施例では、リード線１４にの
み偏平状の部分１４ａを設けてあるが、リード線
１３にも同様の偏平状の部分を設けてもよい。 Note that when the lead wire 14 is made of a lead wire material having a circular cross section, the portion 14a is formed by crushing the lead wire material by means such as press working. With this structure, such a press process becomes unnecessary. Further, in the embodiment, only the lead wire 14 is provided with the flat portion 14a, but the lead wire 13 may also be provided with a similar flat portion.
以上述べたように、本考案は、放熱板上に絶縁
体を介して正特性サーミスタを取付けた発熱装置
において、前記正特性サーミスタは、両面に設け
た一対の電極にリード線をそれぞれ接続固定し、
該リード線のうち少なくとも前記絶縁体と相対す
る電極に接続固定したリード線は、前記絶縁体と
相対する部分を偏平状に形成したことを特徴とす
るから、正特性サーミスタを均一に発熱させてそ
の利用効率を高め、小型化または発熱量増大化を
図ると共に、安全性、信頼性を向上させ、併せて
正特性サーミスタと絶縁体との間の熱伝導性を良
好にした発熱装置を提供することができる。 As described above, the present invention provides a heat generating device in which a positive temperature coefficient thermistor is mounted on a heat sink via an insulator, in which lead wires are connected and fixed to a pair of electrodes provided on both sides of the positive coefficient thermistor. ,
Among the lead wires, at least the lead wire connected and fixed to the electrode facing the insulator is characterized in that the portion facing the insulator is formed in a flat shape, so that the PTC thermistor can generate heat uniformly. To provide a heat generating device that increases the efficiency of its use, is smaller in size or increases in heat output, improves safety and reliability, and has good thermal conductivity between a positive temperature coefficient thermistor and an insulator. be able to.
第１図は従来の発熱装置の分解斜視図、第２図
は同じくその組立断面図、第３図は同じくその等
価回路図、第４図Ａは本考案に係る発熱装置の分
解斜視図、第４図Ｂは同じくその組立断面図、第
５図Ａは正特性サーミスタの他の実施例における
斜視図、第５図Ｂは第５図Ａの正特性サーミスタ
を組込んだ加熱装置の断面図である。
１……放熱板、３……絶縁体、４……正特性サ
ーミスタ、１１，１２……電極、１３，１４……
リード線、１４ａ……偏平状の部分。
FIG. 1 is an exploded perspective view of a conventional heat generating device, FIG. 2 is an assembled sectional view thereof, FIG. 3 is an equivalent circuit diagram thereof, and FIG. 4A is an exploded perspective view of a heat generating device according to the present invention. 4B is an assembled sectional view of the same, FIG. 5A is a perspective view of another embodiment of the PTC thermistor, and FIG. 5B is a sectional view of a heating device incorporating the PTC thermistor of FIG. 5A. be. 1... Heat sink, 3... Insulator, 4... Positive characteristic thermistor, 11, 12... Electrode, 13, 14...
Lead wire, 14a...flat portion.
Claims (1)
取付けた発熱装置において、前記正特性サーミス
タは、両面に設けた一対の電極にリード線をそれ
ぞれ接続固定し、該リード線のうち、少なくとも
前記絶縁体と相対する電極に接続固定したリード
線は、前記絶縁体と相対する部分を偏平状に形成
したことを特徴とする発熱装置。 In a heat generating device in which a positive temperature coefficient thermistor is mounted on a heat sink via an insulator, lead wires are respectively connected and fixed to a pair of electrodes provided on both sides of the positive temperature coefficient thermistor, and at least one of the lead wires is connected to a pair of electrodes provided on both sides. A heat generating device characterized in that a lead wire connected and fixed to an electrode facing the body has a flat portion facing the insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18992180U JPS631421Y2 (en) | 1980-12-31 | 1980-12-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18992180U JPS631421Y2 (en) | 1980-12-31 | 1980-12-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57113390U JPS57113390U (en) | 1982-07-13 |
| JPS631421Y2 true JPS631421Y2 (en) | 1988-01-14 |
Family
ID=29994185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18992180U Expired JPS631421Y2 (en) | 1980-12-31 | 1980-12-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS631421Y2 (en) |
-
1980
- 1980-12-31 JP JP18992180U patent/JPS631421Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57113390U (en) | 1982-07-13 |
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