JPH0475287A - High frequency heating apparatus - Google Patents
High frequency heating apparatusInfo
- Publication number
- JPH0475287A JPH0475287A JP18895290A JP18895290A JPH0475287A JP H0475287 A JPH0475287 A JP H0475287A JP 18895290 A JP18895290 A JP 18895290A JP 18895290 A JP18895290 A JP 18895290A JP H0475287 A JPH0475287 A JP H0475287A
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- antenna
- food
- heating chamber
- metal
- 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.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 56
- 235000013305 food Nutrition 0.000 claims description 40
- 230000005855 radiation Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 24
- 229910052751 metal Inorganic materials 0.000 abstract description 24
- 238000005476 soldering Methods 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 8
- 238000010257 thawing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Landscapes
- Electric Ovens (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、食品の有無や解凍状態等を自動的に検知する
高周波加熱装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-frequency heating device that automatically detects the presence or absence of food, the thawing state, etc.
従来の技術
近年、高周波加熱装置を用いた食品の解凍を自動化する
動きが高まっている。BACKGROUND OF THE INVENTION In recent years, there has been a growing movement to automate the thawing of foods using high-frequency heating devices.
従来は、食品重量をキー人力するタイムオートや、食品
重量を自動的に検出する重量センサを用いて食品重量を
知り、あらかじめ食品重量毎に設定されている最適加熱
時間まで加熱するという手段が主流であった。さらに、
加熱室内にマイクロ波検出素子（即ちアンテナ）を配置
し、食品に吸収されずに素子に検出されるマイクロ波電
力が食品の重量に反比例する特性を用いるもの（特公昭
５２−２１３３号公報）があった。以下、その構成につ
いて第８図を用いて説明する。Conventionally, the mainstream method is to know the weight of food using a time auto that manually calculates the weight of the food, or a weight sensor that automatically detects the weight of the food, and then heats it to the optimal heating time that is preset for each food weight. Met. moreover,
A microwave detection element (i.e., an antenna) is placed in the heating chamber, and the microwave power detected by the element without being absorbed by the food is inversely proportional to the weight of the food (Japanese Patent Publication No. 52-2133). there were. The configuration will be explained below using FIG. 8.
加熱室１内に冷凍の食品２が置かれ、制御器７ａ、電波
放射部３より電波４が加えられる。この時食品２に吸収
されなかった電波の一部５が、加熱室１内に取付けられ
たアンテナ６で検出され検波回路７で検波されるが、こ
の検出量は食品２の重量に反比例するので逆に食品２の
重量を判別でき、最適加熱時間を設定できる。A frozen food 2 is placed in a heating chamber 1, and a radio wave 4 is applied from a controller 7a and a radio wave radiator 3. At this time, a part of the radio waves 5 that is not absorbed by the food 2 is detected by the antenna 6 installed in the heating chamber 1 and detected by the detection circuit 7, but this detected amount is inversely proportional to the weight of the food 2. Conversely, the weight of the food 2 can be determined and the optimum heating time can be set.
発明が解決しようとする課題
このような従来の方式では、アンテナ６がら検波回路へ
の信号伝送方式を規定していないが、実際はアンテナ６
と検波回路７間は高周波の信号なので、距離が離れる程
伝送線路が大がかりになってコストがかかったり、伝送
損失が生し感度が落ちたりするので、一体型で構成する
のが望ましい。Problems to be Solved by the Invention In such conventional systems, the signal transmission method from the antenna 6 to the detection circuit is not specified.
Since the signal between the detector circuit and the detection circuit 7 is a high-frequency signal, the longer the distance, the larger the transmission line becomes, increasing costs, and the higher the transmission loss, the lower the sensitivity.
アンテナ６と検波回路７を一体で構成した場合、アース
が一定位置でとられているか、あるいはアースがとれた
りとれなかったりすることが無いかという点が非常に大
きな問題である。何故なら加熱室内から見たアンテナ側
のインピーダンスが、それによって影響を受け、検知感
度が変化したり、アースがとれてないためにすきまを通
って外部機器へ漏波が及んで誤動作の原因となるからで
ある。When the antenna 6 and the detection circuit 7 are integrated, a very important issue is whether the ground is connected at a fixed position, or whether the ground is connected sometimes or not. This is because the impedance on the antenna side as seen from the heating chamber is affected by this, resulting in a change in detection sensitivity, and due to lack of grounding, leakage waves can reach external equipment through gaps, causing malfunctions. It is from.
さらにもう一つの課題として、サービスパーツをどうす
るかという事がある。検波回路の故障やアンテナとの結
合部が故障した際に、従来の手段ではパーツとして交換
できる体制が無かった。Another issue is what to do with service parts. In the event of a failure in the detection circuit or in the coupling part with the antenna, there was no system in place to replace the part using conventional means.
本発明は上記課題を解決するもので、検波回路の取付は
精度が良く、アースへの短絡点を安定に保ち・、それに
加えて、アンテナと検波回路を容易に取付け、取外しで
きる構成の高周波加熱装置を提供することを目的とする
。The present invention solves the above-mentioned problems.The detection circuit can be mounted with high accuracy, the short-circuit point to the ground can be kept stable, and in addition, the antenna and the detection circuit can be easily installed and removed using high-frequency heating. The purpose is to provide equipment.
課題を解決するための手段
本発明の高周波加熱装置は上記目的を達成するために、
食品を格納する加熱室と、食品に電磁波を放射する電波
放射部と、加熱室内の電磁波の一部を検出するアンテナ
と、アンテナの検出した電力を検波する検波回路と、検
波回路出力により各種機器動作を制御する制御器とを有
し、アンテナと検波回路は一体構成とし、加熱室壁面上
の支持具に位置固定する構成としている。Means for Solving the Problems In order to achieve the above objects, the high frequency heating device of the present invention has the following features:
A heating chamber that stores food, a radio wave radiator that emits electromagnetic waves to the food, an antenna that detects some of the electromagnetic waves in the heating chamber, a detection circuit that detects the power detected by the antenna, and various devices using the output of the detection circuit. The antenna and the detection circuit are integrated and fixed to a support on the wall of the heating chamber.
作用
本発明は上記した構成により、アンテナと検波回路を一
体構成とし、加熱室壁面上の支持具にビス止めして位置
固定するので、ビス止め部で完全に検波回路のアースは
短絡し、アンテナや検波回路の故障時にビスを外してユ
ニット交換が出来るものである。Effect of the Invention According to the above-described structure, the present invention integrates the antenna and the detection circuit, and fixes the antenna and the detection circuit in position by screwing them to the support on the wall of the heating chamber. The unit can be replaced by removing the screws in the event of a failure in the detection circuit.
実施例 以下、本発明の実施例を添付図面に基づいて説明する。Example Embodiments of the present invention will be described below with reference to the accompanying drawings.
第１図は本発明の一実施例を示す高周波加熱装置の構成
断面回である。加熱室１内に配置された食品２に、電波
放射部３より電波４が放射される。この時、食品２に吸
収されなかった電波の一部５が、樹脂製の開孔カバー８
を抜け、加熱室１壁面に開けられた開孔９を通り、プリ
ント基板１０上にある銅箔で出来たアンテナ６で検知さ
れ、プリント基板１０の裏面にある検波回路７に伝達さ
れ検波したのち、検波回路出力としてリード１１によっ
て制御器にまで送られる。検波量に応じて制御器１２は
食品の状態を知り最適解凍時間を判定し、電波放射部３
や電波放射部冷却用のファン１３の動作を制御する。検
波回路周辺の構成について、第２図でもう少し詳細に述
べる。FIG. 1 is a cross-sectional view of a high-frequency heating device showing an embodiment of the present invention. Radio waves 4 are radiated from a radio wave radiator 3 to a food 2 placed in a heating chamber 1. At this time, some of the radio waves 5 that were not absorbed by the food 2 are transferred to the resin aperture cover 8.
It passes through the opening 9 made in the wall of the heating chamber 1, is detected by the antenna 6 made of copper foil on the printed circuit board 10, is transmitted to the detection circuit 7 on the back of the printed circuit board 10, and is detected. , and is sent to the controller by a lead 11 as a detection circuit output. According to the detected amount, the controller 12 knows the condition of the food, determines the optimal thawing time, and transmits the radio wave emitting part 3.
It also controls the operation of the fan 13 for cooling the radio wave radiating section. The configuration around the detection circuit will be described in more detail in Figure 2.
第２図は、検波回路７およびアンテナ６を加熱室１の壁
面にどの様に取付けているかの一例を示す要部斜視図で
ある。アンテナ６と検波回路７を表と裏に持つプリント
基板１０のアース面を、金属板１４の半田付は用凸部１
５の４ケ所に半田付けする。FIG. 2 is a perspective view of essential parts showing an example of how the detection circuit 7 and antenna 6 are attached to the wall surface of the heating chamber 1. The ground plane of the printed circuit board 10 which has the antenna 6 and the detection circuit 7 on the front and back sides is connected to the convex part 1 for soldering of the metal plate 14.
Solder at the 4 locations in 5.
その上から電波遮断用の金属カバー１６でおおい、加熱
室ｌ壁面にスポット溶接で取付けた金属支持具１７にビ
ス１８でとも締めする。この構成では、プリント基板１
０（検波回路７）のアースは金属板１４への半田付けで
確実にとれ、金属板１４と金属支持具１７はビス止めに
より確実にショートし、金属支持具１７と加熱室１壁面
は溶接により確実にショートするため、取付は位置精度
が良く、アースは確実で、ビス締めによるストレスを金
属板１４が吸収するため検波回路へのストレスも抑えら
れることが判る。よってアースは確実にとれ、ビス１日
を外すことによりすぐに検波回路７・アンテナ６・金属
板１４・−金属カバー１６を取換える事も可能である。It is covered with a metal cover 16 for blocking radio waves, and is fastened with screws 18 to a metal support 17 attached to the wall surface of the heating chamber l by spot welding. In this configuration, the printed circuit board 1
0 (detection circuit 7) can be reliably grounded by soldering to the metal plate 14, the metal plate 14 and the metal support 17 can be reliably shorted by screws, and the metal support 17 and the wall of the heating chamber 1 can be connected by welding. It can be seen that since the short circuit is ensured, the mounting has good positional accuracy, the grounding is reliable, and the stress on the detection circuit is suppressed because the metal plate 14 absorbs the stress caused by tightening the screws. Therefore, grounding can be ensured, and by removing the screws, the detection circuit 7, antenna 6, metal plate 14, and metal cover 16 can be replaced immediately.
第３図はプリント基板１０の一例を検波回路７側から見
た図である。図中破線は基板の裏側のパターンを示し、
−点鎖線は裏面でパターンはあるがレジストの無い部分
（即ち第２図で述べた金属板１４に半田付けするための
アース）である。アンテナ６から伝達された電波は、ス
ルーホール１９より検波回路７へ導かれ、ショットキバ
リヤー・ダイオード２０等のチップ部品とマイクロスト
リップ・ラインで構成される検波回路７で検波されて、
す−ド線１１以降直線となった状態で信号が伝送される
。FIG. 3 is a diagram of an example of the printed circuit board 10 viewed from the detection circuit 7 side. The broken line in the figure indicates the pattern on the back side of the board.
- The dotted chain line is the part on the back side where there is a pattern but no resist (that is, the ground for soldering to the metal plate 14 described in FIG. 2). The radio waves transmitted from the antenna 6 are guided to the detection circuit 7 through the through hole 19, and are detected by the detection circuit 7, which is composed of chip components such as a Schottky barrier diode 20 and a microstrip line.
The signal is transmitted in a straight line from the ground wire 11 onward.
第４図〜第７図は、本発明の高周波加熱装置における解
凍検知の原理を示す特性図である。ここで検知原理につ
いて説明を加える。4 to 7 are characteristic diagrams showing the principle of thawing detection in the high-frequency heating device of the present invention. Here we will add an explanation of the detection principle.
食品の比誘電率ε、と誘電損失ｔａｎδの積は、食品が
均一に加熱されて全体が同時に温度上昇していく場合、
第４図の様に変化する。横軸は食品の温度、縦軸はε、
・ｔａｎδである。ε、・ｔａｎδは食品がどれだけ電
波を吸収しやすいかを示す指標であり、冷凍時には電波
を吸収しにくく、Ｏ″ＣＣ付近電波を吸収しやすいこと
を示している。言い換えると、食品に吸収されずにアン
テナで検出される電波は、冷凍時には多く、０°Ｃ付近
では少なくなるのである。このことから、第５図が得ら
れる。横軸は食品の温度、縦軸は検波回路出力を示して
いる。この図から判るように、食品が均一な温度上昇を
示す場合は、−検波出力の変曲点で解凍検知が可能な様
に考えられる。ところが実際は、高周波加熱装置による
加熱は不均一であり、部分的に電波が集中する所や集中
しない所の組み合わせになるため、第５図の曲線がいく
つも重なり合った波形となり、−概に変曲点で解凍完了
とはいかない。The product of the dielectric constant ε and the dielectric loss tan δ of the food is, when the food is heated uniformly and the temperature of the whole food increases at the same time,
It changes as shown in Figure 4. The horizontal axis is the temperature of the food, the vertical axis is ε,
・It is tan δ. ε,・tanδ is an index that shows how easily food absorbs radio waves, and indicates that it is difficult to absorb radio waves when frozen, and it is easy to absorb radio waves near O''CC.In other words, food absorbs radio waves easily. The number of radio waves detected by the antenna without being detected is large during freezing, and decreases near 0°C.From this, Figure 5 is obtained.The horizontal axis represents the temperature of the food, and the vertical axis represents the output of the detection circuit. As can be seen from this figure, if the food shows a uniform temperature rise, thawing can be detected at the inflection point of the -detection output.However, in reality, heating by a high-frequency heating device is not possible. The waveform is uniform and has a combination of places where the radio waves are concentrated and places where they are not concentrated, resulting in a waveform in which many of the curves in Fig. 5 overlap, and the decompression is generally not completed at the inflection point.
そこで実際に有効なのは、検波回路出力の初期値と、初
期変化率である。初期値は食品重量とおよそ反比例の関
係にあり、例えば少量の食品の場合電波の吸収が少なく
初期検波回路出力が大きいのに対し、大量の食品の場合
電波の吸収が大きく初期検波回路出力が小さい。また、
低温（−２０°Ｃ）の食品の場合検波回路出力の初期変
化率が大きいのに対し、中温（−１０″Ｃ）の食品の場
合検波回路出力の初期変化率が小さいというような具合
いである。Therefore, what is actually effective is the initial value and initial rate of change of the output of the detection circuit. The initial value is approximately inversely proportional to the weight of the food; for example, for a small amount of food, the absorption of radio waves is low and the output of the initial detection circuit is large, whereas for a large amount of food, the absorption of radio waves is large and the output of the initial detection circuit is small. . Also,
For foods at low temperatures (-20°C), the initial rate of change in the output of the detection circuit is large, while for foods at medium temperatures (-10"C), the initial rate of change in the output of the detection circuit is small. .
第６図に代表的な例を示した。横軸は時間で縦軸は検波
回路出力、図中ａは少量低温の食品で、ｂは大量中温の
食品を示す。A typical example is shown in Figure 6. The horizontal axis is time and the vertical axis is the detection circuit output. In the figure, a indicates a small amount of low-temperature food, and b indicates a large amount of medium-temperature food.
以上の原理から、第７図の様な、初期出力変化率をパラ
メータに重量と初期出力の相関を求め、食品の重量判定
および初期温判定しているのである。（但し、図中Ｃは
変化重大の低温食品、ｄは変化率小の中温食品）もちろ
ん、制御器Ｉ２内で重量と初期層毎に最適加熱時間を設
定し調理することで、皿の重量等で誤判定する重量セン
サ等と比較して、極めて安定な解凍検知を実現している
。Based on the above principle, the correlation between the weight and the initial output is determined using the initial output change rate as a parameter, as shown in FIG. 7, and the weight and initial temperature of the food are determined. (However, in the figure, C is a low-temperature food with a significant change, and d is a medium-temperature food with a small change rate.) Of course, by setting the optimum heating time for each weight and initial layer in the controller I2, you can adjust the weight of the plate etc. Compared to other weight sensors, etc., which make false judgments, this product achieves extremely stable thawing detection.
本実施例の効果として以下の点が挙げられる。The following points can be mentioned as effects of this embodiment.
アンテナ６と検波回路７を金属板１４、金属カバー１６
、金属支持具１７および加熱室１壁面等でおおっている
ため、外部への漏波を出しにくく、外部からのノイズ混
入も受けにくい。The antenna 6 and the detection circuit 7 are connected to a metal plate 14 and a metal cover 16.
Since it is covered with the metal support 17 and the wall surface of the heating chamber 1, it is difficult for waves to leak to the outside and it is difficult to receive noise from the outside.
開孔９付近にアンテナ６を設け、開孔カバー８で防護し
ているので、食品２からアンテナ６への飛散物の直撃が
無く、食品カスによるアンテナ６近傍の誘電率変化等の
誤差要因が排除できる。Since the antenna 6 is provided near the hole 9 and protected by the hole cover 8, there is no direct hit of flying objects from the food 2 to the antenna 6, and error factors such as changes in permittivity near the antenna 6 due to food debris are avoided. Can be eliminated.
発明の効果 本発明によれば以下の効果がある。Effect of the invention According to the present invention, there are the following effects.
（１）アンテナと検波回路を一体構成とし、加熱室壁面
上の支持具にビス止めして位置固定するので、ビス止め
位置で確実にアースがとれ、加熱室側からみたアンテナ
と検波回路を含むインピーダンスが安定し、アンテナの
電波検出量への誤差要因が排除できて、極めて信顧性の
高い検知が実現出来る。(1) The antenna and detection circuit are integrated and fixed in position by screwing them to the support on the heating chamber wall, so the grounding can be ensured at the screwed position, and the antenna and detection circuit are included as seen from the heating chamber side. Impedance is stabilized, error factors in the amount of radio waves detected by the antenna can be eliminated, and extremely reliable detection can be achieved.
（２） （１）と同様の理由で、アンテナおよび検波
回路を容易に取付け・取外し出来るので、故障時のサー
ビスの対応が極めて簡単であり、使用者にとってメンテ
ナンスのわずられしさを感じさせないと共に、サービス
マンへの負担も少なくて済む。(2) For the same reason as (1), since the antenna and detection circuit can be easily installed and removed, servicing in the event of a breakdown is extremely easy, and the user does not feel the burden of maintenance. , the burden on service personnel is also reduced.
第３図は同装置の検波回路の正面図、第４図はε。
ｔａｎδの温度特性図、第５図は検波回路出力の理想温
度特性図、第６図は検波回路出力の時間変化を示す特性
図、第７図は検波回路出力の初期値の重量に対する変化
を示す特性図、第８図は従来の高周波加熱装置の構成を
示すブロック図である。
ｌ・・・加熱室、２・・・食品、３・・・電波放射部、
６・・・アンテナ、７・・・検波回路、１２・・・制御
器、１８・・・ビス。
代理人の氏名 弁理士 粟野重孝 はか１名ｆ−１ｔａ
熱！
？・・・金品
３− 電″Ｊｌ膜打部
６−７ンテ１
７・−検破回給
１２ −・貯Ｉｎ累、
１８−ビス
７［’ｑ］
第
図
第
図
一１θ
ア［’Ｑ ］
Σ
ト
城
−４！Figure 3 is a front view of the detection circuit of the same device, and Figure 4 is ε. A temperature characteristic diagram of tan δ, Figure 5 is an ideal temperature characteristic diagram of the output of the detection circuit, Figure 6 is a characteristic diagram showing the time change of the output of the detection circuit, and Figure 7 is a diagram showing the change in the initial value of the output of the detection circuit with respect to weight. The characteristic diagram, FIG. 8, is a block diagram showing the configuration of a conventional high-frequency heating device. l...heating chamber, 2...food, 3...radio wave emitting section,
6... Antenna, 7... Detection circuit, 12... Controller, 18... Bis. Name of agent: Patent attorney Shigetaka Awano Haka1 person f-1ta
heat! ? ...Metal goods 3- Electron Jl Membrane striking part 6-7 Inte 1 7 - Inspection return 12 - Accumulation In, 18- Screw 7 ['q] Figure Figure 1 1θ A ['Q] Σ Castle-4!
Claims (1)
て加熱する電波放射部と、前記加熱室内の電磁波を検出
するアンテナと、前記アンテナの検出した電力を検波す
る検波回路と、前記検波回路の出力により各種機器動作
を制御する制御器とを有し、前記アンテナと前記検波回
路は一体構成とし、前記加熱室の壁面上の支持具に取り
付けた高周波加熱装置。a heating chamber that stores food; a radio wave radiation section that radiates electromagnetic waves to the food to heat the food; an antenna that detects the electromagnetic waves in the heating chamber; a detection circuit that detects the electric power detected by the antenna; and the detection circuit. a controller for controlling various equipment operations based on the output of the high-frequency heating device, the antenna and the detection circuit are integrally configured, and the high-frequency heating device is attached to a support on a wall surface of the heating chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18895290A JPH0475287A (en) | 1990-07-17 | 1990-07-17 | High frequency heating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18895290A JPH0475287A (en) | 1990-07-17 | 1990-07-17 | High frequency heating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0475287A true JPH0475287A (en) | 1992-03-10 |
Family
ID=16232795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18895290A Pending JPH0475287A (en) | 1990-07-17 | 1990-07-17 | High frequency heating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0475287A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5801612A (en) * | 1995-08-24 | 1998-09-01 | Raychem Corporation | Electrical device |
| US5856773A (en) * | 1996-11-04 | 1999-01-05 | Raychem Corporation | Circuit protection device |
| US6114942A (en) * | 1995-08-07 | 2000-09-05 | Kk Raychem | PTC device and battery pack using the same |
| US6362721B1 (en) | 1999-08-31 | 2002-03-26 | Tyco Electronics Corporation | Electrical device and assembly |
-
1990
- 1990-07-17 JP JP18895290A patent/JPH0475287A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6114942A (en) * | 1995-08-07 | 2000-09-05 | Kk Raychem | PTC device and battery pack using the same |
| US5801612A (en) * | 1995-08-24 | 1998-09-01 | Raychem Corporation | Electrical device |
| US5856773A (en) * | 1996-11-04 | 1999-01-05 | Raychem Corporation | Circuit protection device |
| US6362721B1 (en) | 1999-08-31 | 2002-03-26 | Tyco Electronics Corporation | Electrical device and assembly |
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