JP3584906B2 - Induction heating cooker - Google Patents

Induction heating cooker Download PDF

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Publication number
JP3584906B2
JP3584906B2 JP2001201652A JP2001201652A JP3584906B2 JP 3584906 B2 JP3584906 B2 JP 3584906B2 JP 2001201652 A JP2001201652 A JP 2001201652A JP 2001201652 A JP2001201652 A JP 2001201652A JP 3584906 B2 JP3584906 B2 JP 3584906B2
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JP
Japan
Prior art keywords
light
induction heating
top plate
light guide
heating coil
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 - Lifetime
Application number
JP2001201652A
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Japanese (ja)
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JP2003015560A (en
Inventor
徹也 鍜治
勝行 相原
芳夫 木下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Panasonic Holdings Corp
Original Assignee
Panasonic Corp
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Panasonic Corp, Matsushita Electric Industrial Co Ltd filed Critical Panasonic Corp
Priority to JP2001201652A priority Critical patent/JP3584906B2/en
Priority to US10/179,308 priority patent/US6969834B2/en
Priority to KR10-2002-0036455A priority patent/KR100494962B1/en
Priority to FR0208281A priority patent/FR2827114B1/en
Priority to CN2010102905503A priority patent/CN101982148B/en
Priority to CN2010102905467A priority patent/CN101982146B/en
Priority to CN2010102905471A priority patent/CN101982147B/en
Priority to CN2010102905541A priority patent/CN101982150B/en
Priority to CN021405301A priority patent/CN1395059B/en
Priority to CN2010102905518A priority patent/CN101982149B/en
Publication of JP2003015560A publication Critical patent/JP2003015560A/en
Application granted granted Critical
Publication of JP3584906B2 publication Critical patent/JP3584906B2/en
Priority to US11/179,496 priority patent/US7109450B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/02Induction heating
    • H05B6/10Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12Cooking devices
    • H05B6/1209Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1218Cooking devices induction cooking plates or the like and devices to be used in combination with them with arrangements using lights for heating zone state indication
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/02Induction heating
    • H05B6/10Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12Cooking devices
    • H05B6/1209Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1245Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
    • H05B6/1263Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements using coil cooling arrangements
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/02Induction heating
    • H05B2206/022Special supports for the induction coils

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、線状発光体およびそれを用いた誘導加熱調理器に関する。
【0002】
【従来の技術】
従来、この種の線状発光体としては、例えば、特開2000−222907号公報に記載されているようなものがあった。図14は、前記公報に記載された線状発光体を示す。
【0003】
図14において、線状発光体1は光源2と光源2からの光を導光する断面円形の柱状の導光体3とから構成されている。そして、導光体3の側面にその長さ方向に沿って、少なくとも1本の帯状の光反射層4が印刷により設けられている。この構成によって、光源2から導光体3に入射した光は導光体3を進行する間に、光反射層4によって光の一部が反射し、光反射層4と対向する導光体3の部分より外部へ光を放射することによって、線状の発光が得られるということが開示されている。
【0004】
また、誘導加熱調理器は加熱コイルに高周波電流を流し、高周波磁界を発生させ、加熱コイルと磁気結合している鍋(負荷)に渦電流によるジュール熱を発生させ、鍋自体を発熱させて調理を行う調理器である。そのため炎が見えるガス調理器や加熱部が赤熱する電気ヒータと違い加熱部を視覚的に捉えることが出来ないという問題があった。
【0005】
この課題を解決するために、例えば、特開平7−312279号公報には加熱コイルの外周に環状に複数個の加熱表示用の発光ダイオードとその外側近傍に火力表示用の発光ダイオードとを設け、加熱コイルに通電し加熱すると加熱表示用の発光ダイオードが光り加熱状態が分かるということが記載されている。
【0006】
さらに、特開2001―160483号公報には図15に示すように、誘導加熱コイルの下方に、扇状の導光体片5と扇状のように設けた光源6とで発光体の1ブロックとし、これらのブロックを組合わせて円環状の導光体を構成し、誘導加熱コイルに通電し加熱すると光源6が点灯し、円環状の導光体の外周部発光面7で発光し加熱状態が分かるということが記載されている。
【0007】
【発明が解決しようとする課題】
しかしながら、前記従来の線状発光体の構成では、円柱の導光体3の側面に光反射層4を設けているために、光反射層4から反射した光が外部に放射するとき導光体3の放射面が凸状になっており、光が拡散し鮮明な線状が得にくいという問題があった。
【0008】
また、従来の誘導加熱調理器は誘導加熱コイルの周辺に発光手段として、例えば電球を配した形なので、誘導加熱コイルに対応する加熱部を表示するのに複数個の電球が必要であった。また、電球の数を限定すると点表示なので全体が分かりにくくなるという問題があった。
【0009】
さらに、導光体片5と電源6とを1ブロックとし、これらを円環状に組合わせたものは構成が複雑となり、価格が高くなるという問題があった。
【0010】
本発明は前記従来の課題を解決するもので、信頼性が高く、鮮明な線状が得やすい線状発光体を提供するとともに、この線状発光体を誘導加熱コイルの外周部に設け、対応する加熱部の加熱範囲を明確に表示することができる誘導加熱調理器を提供することを目的とする。
【0011】
【課題を解決するための手段】
前記従来の課題を解決するために、本発明の誘導加熱調理器は、本体ケースの上面に設けた透光性の天板と、前記天板上に設けた被加熱調理容器を載置して誘導加熱により加熱する加熱部と、前記天板の下方に前記加熱部に対応して設けた誘導加熱コイルと、前記誘導加熱コイルの外周部に設けられ前記誘導加熱コイルの一部または全周にわたって前記天板方向に発光する線状発光体とを備え、前記線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形の導光体と、前記導光体の長さ方向の少なくとも一端に設けた光源とを有し前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短となる面を、前記光を外部に放射する発光面とし、前記長辺を 厚みとし、前記発光面に対向するに光反射層を設ける構成とした。そして、光反射層から反射した光が外部に放射するとき導光体の放射面が平面になっているため、光反射層からの反射光は外部に直進して放射することになり、拡散しにくくなる。そのため鮮明な線状発光が得られる。
【0012】
また、誘導加熱調理器の天板上の加熱部に対応して設けた加熱コイルの外周部を囲む導光体として、本発明の線状発光体を用いる構成とした。そしてこの導光体に入った光を誘導加熱コイルの一部または全周にわたって天板方向に発光するようにした。これによって、簡単な構成で、誘導加熱コイルの一部または全周にわたって発光するので天板上に加熱部を明確に表示することができる。
【0013】
【発明の実施の形態】
請求項1に記載の発明は、本体ケースの上面に設けた透光性の天板と、前記天板上に設けた被加熱調理容器を載置して誘導加熱により加熱する加熱部と、前記天板の下方に前記加熱部に対応して設けた誘導加熱コイルと、前記誘導加熱コイルの外周部に設けられ前記誘導加熱コイルの一部または全周にわたって前記天板方向に発光する線状発光体とを備え、前記線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形でかつ円環状に形成された導光体と、前記導光体の一部に形成された光導入部と、光源とを有し、前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短辺となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとし、前記発光面に対向する面に光反射層を設ける構成としたことによって、簡単な構成で、誘導加熱コイルの一部または全周にわたって発光するので天板上に加熱部を明確に表示することができる。また、冷却風を誘導加熱コイルの下部より効率的に取り入れ誘導加熱コイルを冷却することができる。
【0014】
また、光を導光する断面が四辺形の導光体と、前記導光体の長さ方向の少なくとも一端に設けた光源とを備え、前記四角形の一辺を光を外部に放射する発光面とし、前記発光面に対向する辺に光反射層を設ける構成とすることにより、光反射層から反射した光が外部に放射するとき導光体の放射面が平面になっているため、光反射層からの反射光は外部に直進して放射することになり、拡散しにくくなる。そのため鮮明な線状発光が得られる。
【0015】
また、線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形の導光体と、前記導光体の長さ方向の少なくとも一端に設けた光源とを有し、前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短辺となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとする構成とすることによって、発光面からの光の照射を抑制し、伝播する光の量を増やすことができるので、多くの光を遠くまで伝播することができる。
【0016】
請求項に記載の発明は、本体ケースの上面に設けた透光性の天板と、前記天板上に設けた被加熱調理容器を載置して誘導加熱により加熱する加熱部と、前記天板の下方に前記加熱部に対応して設けた誘導加熱コイルと、前記誘導加熱コイルの外周部に設けられ前記誘導加熱コイルの一部または全周にわたって前記天板方向に発光する線状発光体とを備え、前記線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形の導光体と、前記導光体の長さ方向の少なくとも一端に設けた光源とを有し前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとし、前記発光面に対向するに光を反射する反射材を重ね合わせる構成とすることにより、簡単な構成で、誘導加熱コイルの一部または全周にわたって発光するので天板上に加熱部を明確に表示することができる。
【0017】
また、線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形の導光体と、前記導光体の長さ方向の少なくとも一端に設けた光源とを有し、前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短辺となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとする構成とすることによって、発光面からの光の照射を抑制し、伝播する光の量を増やすことができるので、多くの光を遠くまで伝播することができる。
【0018】
また、反射材で反射した光を発光面より外部に照射することができる。また、反射材の色を変えることで、発光面から外部へ照射する色を選ぶことができる。
【0019】
請求項に記載の発明は、本体ケースの上面に設けた透光性の天板と、前記天板上に設けた被加熱調理容器を載置して誘導加熱により加熱する加熱部と、前記天板の下方に前記加熱部に対応して設けた誘導加熱コイルと、前記誘導加熱コイルの外周部に設けられ前記誘導加熱コイルの一部または全周にわたって前記天板方向に発光する線状発光体とを備え、前記線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形でかつ円環状に形成された導光体と、前記導光体の一部に形成された光導入部と、光源とを有し、前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短辺となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとし、前記発光面に対向する面に光反射層を設ける構成とすることにより、例えば、誘導加熱コイルの外周部を明示できるようにすることができる。また、このような形状の導光体は一般的には樹脂成型により容易に得られる。
【0020】
請求項4に記載の発明は、本体ケースの上面に設けた透光性の天板と、前記天板上に設けた被加熱調理容器を載置して誘導加熱により加熱する加熱部と、前記天板の下方に前記加熱部に対応して設けた誘導加熱コイルと、前記誘導加熱コイルの外周部に設けられ前記誘導加熱コイルの一部または全周にわたって前記天板方向に発光する線状発光体とを備え、前記線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形でかつ円環状に形成された導光体と、前記導光体の一部に形成された光導入部と、光源とを有し、前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短辺となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとし、前記発光面に対向する面に光を反射する反射材を重ね合わせる構成とすることにより、例えば、誘導加熱コイルの外周部を明示できるようにすることができる。また、このような形状の導光体は一般的には樹脂成型により容易に得られる。
【0021】
請求項に記載の発明は、線状発光体を、導光体の発光面以外の面に導光体より光の屈折率の小さい層を設ける構成としたので、これらの面で光が全反射するので光源からの光を遠くまで伝播することができる。
【0022】
【実施例】
以下、本発明の一実施例について図面を用いて説明する。
【0023】
(実施例1)
図1は本発明の実施例1における線状発光体10の斜視図である。
【0024】
図1において、11は光源であり、電球やLED(発光ダイオード)などを用いる。特に発光ダイオードは発光色が色々あり目的に応じて選択できるので好ましい。12は光源11より入射した光を導光する導光体であり、アクリル樹脂、ポリカーボネイト、ポリアミド、ポリイミドなどの合成樹脂、またはガラスなどの透明な材料が用いられる。図1では断面が長方形である四辺形を用いた場合の例である。13は導光体12の1辺に設けられた光反射層である。この光反射層は表面を研磨するなどの機械的手段、または表面をエッチングするなどの化学的手段により、表面に凹凸等を設けることにより形成される。またシリコーンゴムなどの接着剤の層、または粘着テープを貼り付けるなどによる粘着層を設けることにより光反射層を得ることが出来る。また、金属、あるいは、酸化アルミニウム、酸化ケイ素、酸化チタンなどの金属酸化物の粒子を含んだ膜を形成することにより得られる。
【0025】
以上のように構成された線状発光体10について、以下その動作、作用について説明する。
【0026】
光源11より入射した光は導光体12中を導光する。そして、光の一部は光反射層13により反射し発光面14より外部に放射する。このとき導光体12は四辺形で構成され、光反射層13はその一辺に設けられているので、ここで反射した光は光反射層13に対応する辺である発光面14より外部に発光する。発光面14は平面であるため発光面からの光の放射は平行となりほとんど拡散しない。このため導光体の光の進行方向に沿って鮮明な線状の発光を得ることが出来る。
【0027】
以下、光反射層の効果について図2の導光体の斜視図を用いて説明する。図2において、導光体は巾d3mm、高さh15mmの長方形の断面を有するポリカーボネイトを用い、それに光反射層13としてシリコーンゴム(接着剤)を用いた。そして光反射層の効果は、光源から一定の距離l100mmの地点の照度を測定することにより行った。光反射層13を設けない場合の照度は0.7ルックスであり、発光面14に対向する面のみに光反射層13を設けた場合の照度は1.79ルックスであった。また、発光面14以外のすべての面に光反射層13を設けた場合の照度は1.97ルックスであった。このことより発光面14に対抗する面に光反射層13を設けることにより著しく光りの放射が増えることが分かる。また、発光面14に対向する面以外に光反射層13を設けてもそれほど効果が無いことが分かる。なお、いずれの場合においても鮮明な線状発光が得られた。
【0028】
以上基本構成について説明したが導光体を下記に説明するようにするとさらに優れた線状発光体とすることができる。
【0029】
すなわち、光源11から遠い位置まで光が届くようにするためには発光面14以外の面に導光体より光の屈折率の小さい層を設けると、光の透過損失が少なくなるため、遠方まで届くようになる。
【0030】
また、光反射層13の反射率が部分ごとに異なるようにすることにより、発光面14からの光の放射が異なり光の強弱の模様をつけることができる。
【0031】
また、発光面14とそれに対抗する面とを機械的または化学的手段等により鏡面とすると、乱反射により光が外部に漏洩することが少なくなり、光が遠くまで届くようになる。これはどちらか一方の面を行うことでも効果がある。
【0032】
また、発光面14とそれに対向する面を機械的または化学的手段等により光を乱反射する乱反射面とすることにより、導光体中を伝播する光を乱反射させ、発光面14より放射する光の量を多くすることができ鮮明な線状発光を得ることができる。
【0033】
また、導光体12中を伝播する光の進行方向に対して、発光面14が平行に位置する構成とした。この構成にすることにより、光源11の指向性に左右されることなく、また光源からの直進光が伝播中に損失することなく届くので、導光体12の発光面13をより遠くまで発光させることができる。
【0034】
また、図2に示すように短辺dと長辺hを有する四角形(長方形)からなる導光体12において、短辺dを発光面14とすると、光源11の光をより遠くまで届くようにすることができる。また、短辺dに比べ長辺hの長さを長くするほど光をより遠くまで届くようにすることができる。実験例を(表1)に示す。
【0035】
【表1】

Figure 0003584906
【0036】
(表1)は光源から50mmの地点が0.7ルックスになるようにLEDの電源電圧を調整し、光源からの距離が100mmおよび150mm地点の照度を測定した。このとき、導光体12の発光面14である短辺dを3mmとし、長辺hを5、10、15mmに変えておこなった。また、LEDの視野角も変えて行った。表に見られるようにLEDの視野角に関係なく、長辺hが大きいほど光が遠くにまで良く伝播するのが分かる。これは、発光面14から放射して失われる光よりもより多くの光が遠方に送られるためと考えられる。
【0037】
また、図2に示すように、導光体12の厚みhを光反射層14の厚みtより厚くすると、導光体12中の伝播する光の損失を低減し、光源の光を有効に利用して遠くまで発光面14を光らせることができる。
【0038】
また、線状発光体は線状に発光させたものである。したがって、棒状に限定されるものでなく、円環状にしたり、棒状の線状発光体を組合わせることにより三角形または多角形にしたりすることができる。その他、任意の形状に加工した線状発光体を得ることができる。特に誘導加熱調理器に円環状の線状発光体を用いると誘導加熱コイルの外周部を明示でき取り扱いが容易となる。
【0039】
次に、光源について説明する。導光体12の光の放射強度すなわち、輝度は光源11から遠ざかるにしたがって低下する。したがって、導光体12の照射強度をほぼ均一にするには導光体12の途中で光を補充する必要がある。通常全長が50〜70センチ程度の線状発光体であれば図3に示すように線状発光体の両側に光源11を設ければほぼ均一に発光する線状発光体とすることができる。図3(a)は棒状の線状発光体の場合,(b)は円環状の線状発光体の場合を示す。
【0040】
図4は円環状の線状発光体に光を補充する他の例を示したもので、図4(a)は線状発光体の平面図であり、図4(b)は別の線状発光体の斜視図である。図に示すように導光体12の一部に導光体12と同じ材料からなる光導入部12aを設けている。これにより光を補充しほぼ均一に発光する線状発光体を得ることができる。
【0041】
また、表1に示すように光源としてLEDを用いた場合、視野角により光が遠くに届く量が異なってくる。したがって、できるだけ線状発光体の発光を均一にするためにはLEDの視野角を30〜60度以内とするのが実用的である。
【0042】
なお、本発明でいう均一発光とは、光学的に均一というのでなく、見た目、あるいは実際の感じがほぼ均一であることをいう。
【0043】
以上の説明では、導光体12に光反射層13を一体に設けた場合について説明したが、導光体と光反射層とを別々に設けこれらを重ね合わせて一体として用いてもほぼ同様の効果が得られる。また、図4(c)のように断面コの字状のケースに導光体12を挿入したり、図4(d)のように、導光体12の光反射層との合わせ面を円弧で形成し、それに光反射層13を挿入したりして、少なくとも発光面に対応するケースの面に光反射材を設けるようにしてもよい。これらの場合においても、前記説明したような種々の加工を導光体に行っても前記とほぼ同様の効果が得られるのは勿論である。
【0044】
(実施例2)
以下、本発明の実施例2について図面を参照して説明する。なお、実施例1と同一構成要素には同じ符号を付し、その説明は省略する。
【0045】
なお本実施例でいう誘導加熱コイルの外周部とは投影面で導光体が誘導加熱コイルの外周にあることを意味するものであって、高さ方向の位置関係を指定したものではないが、本実施例では導光体は誘導加熱コイルの外周部にあるとして説明する。
【0046】
図5は本実施例に用いる誘導加熱調理器の外観斜視図である。図5に示すように本体ケース15の上面に透光性の天板16が設けられている。この天板16には誘導加熱によって鍋を加熱し被調理物を調理する加熱部17と誘導加熱では使えない鍋を用いて調理するラジエントヒータ18とが設けられている。また本体ケース15の前方側面には焙焼器19と操作部20とが設けられている。
【0047】
図6は図5の加熱部17の一方の断面を示す要部断面図である。図において天板16の加熱部17上に調理鍋21が載置される。この調理鍋21を加熱するために天板16の下部の加熱部17すなわち調理鍋に対応する位置に誘導加熱コイル22を設けている。さらに天板16の下方に導光体12を設けている。そして、この導光体12の大きさを誘導加熱コイル22の外周部を囲う程度の大きさにすることにより導光体12よりの発光が加熱コイルに妨げられることなく天板16に達し、天板16上に加熱部17の範囲を明確に表示するようにすることができる。光源から発した光が導光体12を伝播する。23は制御部で調理にあたっての火力の調節や光源11の点滅などの制御を行う。
【0048】
図7は実施例1で説明した線状発光体の平面図である。本実施例では、断面が長方形である導光体12を円環状とし、その両端に光源11を一個ずつ、計2個を配した構成としている。また、円環状の内径は誘導加熱コイル22の外形よりやや大きくしてある。なお、このような形状の導光体は一般的には樹脂成型により容易に得られる。
【0049】
光源11から発した光は導光体12を直進または反射を繰り返しながら伝播していく。この伝播していく過程で天板16方向に光を放射し、その強度は減衰していく。このように光は導光体12を伝播しながら天板16方向に光を放射していくので、天板16には導光体12の上面形状と同じ形状の図形が表示される。図7に示す形状の線状発光体を用いた場合は円環が表示されることになる。特に、本実施例では断面が四角形の導光体を用いているため、光が拡散するのを抑えることができ鮮明な図形を表示できる。
【0050】
図8は冷却風と線状発光体との関係を説明するための模式図である。図において、誘導加熱コイル22を冷却するための冷却風Aは、誘導加熱コイル22の下部より取り入れるのが効率的である。冷却風を発生する送風ファン24が1つで誘導加熱コイル22を2個有する場合は、冷却風Aは第1の誘導加熱コイル22aの下部より入り、この第1の誘導加熱コイル22aを冷却した後、隣の第2の誘導加熱コイル22bを冷却した後外部に排出する風路が設けられる。このとき、後から冷却される第2の誘導加熱コイル22bの光源11は温度の高くなった冷却風Aに曝される恐れがある。特にLEDなどのような半導体発光素子を光源11として用いていると、その寿命のみならず、その発光特性は周囲の温度の影響を受ける。そこでこのような場合、図9に示すように後で冷却される第2の誘導加熱コイル22bに対応して設けられた線状発光体10の光源11を風上に設けるようにする。これにより冷却風Aの温度の影響を低減することができる。
【0051】
図10は誘導加熱コイルの底面に放射状に設けたフェライト25と線状発光体10との位置関係を示す模式図である。フェライトは磁束が漏洩するのを低減するために用いられる。図に示すように、光源11を放射線状に設けたフェライトの延長線上を避け、延長線上の間に設けるようにする。これは放射線状の延長線上はあまり磁束が低減されておらず、光源11が磁束の影響を受けやすいからである。
【0052】
なお、天板16には結晶化ガラス等が用いられる。通常内部が見えないようにするため天板16には着色が施されている。この着色の方法としては、結晶化ガラスそのものを着色する場合と、結晶化ガラスに塗装を施し着色する場合とがある。本実施例による線状発光体を用いて天板16上に図形を表示した場合、結晶化ガラスそのものに着色するよりも、耐熱透光性塗料を塗布して得たものの方が明るい図形が得られた。また、耐熱透光性塗料は光の波長に合わせて、選択することができ、異なる色を天板状に透過させることができる。
【0053】
(実施例3)
以下、本発明の実施例3について述べる。なお、実施例1および2と同一構成要素には同じ符号を付し、その説明は省略する。
【0054】
図11は本実施例に用いる発光体26である。この発光体26は実施例1の導光体12を3本用いて同心円状に環状一体とし、それぞれの導光体12に少なくとも1つの光源(図示せず)を配し、誘導加熱コイルの外周部に配するようにしたものである。これによって、機器の機能、使用状態、火力の大きさ、あるいは使用時間などにより、導光体ごとに光源の種類、色、大きさあるいは明るさを変えたり、点灯、点滅あるいは消灯を行ったりすることができるので、表示パターンを多くし、加熱部を視覚的により解りやすく捉えることができる。
【0055】
(実施例4)
以下、本発明の実施例4について述べる。なお、実施例1および2と同一構成要素には同じ符号を付し、その説明は省略する。
【0056】
図12は本実施例に用いる発光体27である。この発光体27は実施例1の線状発光体10を4本用い、円環状に一体とし、誘導加熱コイルの外周部に配するようにしたものである。これによって、機器の機能、使用状態、火力の大きさ、あるいは使用時間などにより、導光体ごとに光源の種類、色、大きさあるいは明るさを変えたり、点灯、点滅あるいは消灯を行ったりすることができるので、表示パターンを多くし、加熱部を視覚的により解りやすく捉えることができる。
【0057】
(実施例5)
以下、本発明の実施例5について述べる。なお、実施例1および2と同一構成要素には同じ符号を付し、その説明は省略する。
【0058】
図13は本実施例に用いる発光体28である。この発光体28は実施例1の導光体12を3本用い、各導光体間に長さ方向に沿って光隔離層29を設け、これを円環状とし、各導光体12に光源(図示せず)を配し誘導加熱コイルの外周部に配するようにしたものである。これにより構成を簡単にし、機器の機能、使用状態あるいは使用時間などにより、導光体ごとに光源の種類、色、大きさあるいは明るさを変えたり、点灯、点滅あるいは消灯を行ったりすることができるので、表示パターンを多くし、加熱部を視覚的に捉えることができる。
【0059】
なお、本実施例2〜5では誘導加熱コイル全周にわたって発光する場合について説明したが必要に応じて半周などの加熱コイルの一部であってもよいし、円環状でなく四角形などの他の図形を表示するようにしても良い。また、加熱コイル以外の箇所でも他の箇所と視覚的に区別したいところであっても構わない。
【0060】
以上のように,本実施例に拠れば断面四角形の導光体を用いているので天板上に点や線でなく全体にわたって連続した鮮明な図形を描くことができる。しかも光源の使用数も最低限に抑えることができでコスト的にも安価にできる。
【0061】
【発明の効果】
以上述べたように、発明によれば、簡単な構成で、信頼性が高く、鮮明な線状が得やすい線状発光体を得ることができ、この線状発光体を用いることにより誘導加熱調理器の天板上に加熱部の加熱範囲を明確に表示することができる。また、冷却風を誘導加熱コイルの下部より効率的に取り入れ誘導加熱コイルを冷却することができる。
【図面の簡単な説明】
【図1】本発明の実施例1における線状発光体の斜視図
【図2】同線状発光体の導光体の斜視図
【図3】(a)同棒状の線状発光体の平面図
(b)同円環状の線状発光体の平面図
【図4】(a)同線状発光体の他の全体平面図
(b)同線状発光体の他の全体斜視図
(c)同線状発光体の他の部分斜視図
(d)同線状発光体の他の部分斜視図
【図5】本発明の実施例2における誘導加熱調理器の外観斜視図
【図6】同誘導加熱調理器の要部断面図
【図7】同誘導加熱調理器に用いる線状発光体の平面図
【図8】同誘導加熱調理器の要部模式図
【図9】同誘導加熱調理器の光源の位置を説明するための模式図
【図10】同誘導加熱調理器のフェライトと線状発光体との位置関係を示す模式図
【図11】本発明の実施例3における誘導加熱調理器の発光体の平面図
【図12】本発明の実施例4における誘導加熱調理器の発光体の平面図
【図13】本発明の実施例5における誘導加熱調理器の発光体の斜視図
【図14】従来の線状発光体の斜視図
【図15】従来の発光体の斜視図
【符号の説明】
10 線状発光体
11 光源
12 導光体
13 光反射層
14 発光面
15 本体ケース
16 天板
17 加熱部
21 調理鍋(被加熱調理容器)
22 誘導加熱コイル
24 送風ファン
25 フェライト
29 光隔離層[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a linear illuminant and an induction heating cooker using the same.
[0002]
[Prior art]
Conventionally, as this kind of linear luminous body, for example, there has been one described in JP-A-2000-222907. FIG. 14 shows a linear luminous body described in the above publication.
[0003]
In FIG. 14, a linear light-emitting body 1 includes a light source 2 and a column-shaped light guide 3 having a circular cross section for guiding light from the light source 2. At least one strip-shaped light reflection layer 4 is provided on the side surface of the light guide 3 along its length direction by printing. With this configuration, a part of the light incident on the light guide 3 from the light source 2 is reflected by the light reflection layer 4 while traveling through the light guide 3, and the light guide 3 facing the light reflection layer 4 is formed. It is disclosed that linear light emission can be obtained by radiating light from the portion to the outside.
[0004]
In addition, induction heating cookers apply high-frequency current to the heating coil to generate a high-frequency magnetic field, generate Joule heat due to eddy currents in the pot (load) magnetically coupled to the heating coil, and heat the pot itself to cook. Is a cooker that does. Therefore, there is a problem that the heating unit cannot be visually grasped unlike a gas cooker in which a flame is visible or an electric heater in which the heating unit is red-hot.
[0005]
In order to solve this problem, for example, in Japanese Patent Application Laid-Open No. 7-313279, a plurality of light emitting diodes for heating display are provided annularly around the outer periphery of a heating coil, and a light emitting diode for thermal power display is provided near the outside thereof. It is described that when a heating coil is energized and heated, a light emitting diode for heating display shines and the heating state can be recognized.
[0006]
Further, as shown in FIG. 15, in Japanese Patent Application Laid-Open No. 2001-160483, a fan-shaped light guide piece 5 and a light source 6 provided in a fan-shape form one block of a light-emitting body below the induction heating coil. These blocks are combined to form an annular light guide, and when the induction heating coil is energized and heated, the light source 6 is turned on, and light is emitted from the outer peripheral light emitting surface 7 of the annular light guide to determine the heating state. It is described.
[0007]
[Problems to be solved by the invention]
However, in the configuration of the conventional linear light-emitting body, since the light reflecting layer 4 is provided on the side surface of the cylindrical light guide 3, when the light reflected from the light reflecting layer 4 is radiated to the outside, the light guide is used. 3 has a problem that the emission surface is convex, and light is diffused to make it difficult to obtain a clear linear shape.
[0008]
Further, the conventional induction heating cooker has a form in which, for example, a light bulb is disposed as a light emitting means around the induction heating coil, so that a plurality of light bulbs are required to display a heating section corresponding to the induction heating coil. In addition, if the number of light bulbs is limited, there is a problem that the whole is difficult to understand because of the point display.
[0009]
Furthermore, the light guide piece 5 and the power supply 6 are made into one block, and the combination thereof in an annular shape has a problem that the configuration becomes complicated and the price increases.
[0010]
The present invention solves the above-mentioned conventional problems, and provides a linear luminous body having high reliability and easy to obtain a clear linear shape, and providing the linear luminous body on an outer peripheral portion of an induction heating coil. It is an object of the present invention to provide an induction heating cooker capable of clearly displaying a heating range of a heating unit to be heated.
[0011]
[Means for Solving the Problems]
In order to solve the conventional problem, the present inventionInduction heating cookerIsA light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, wherein the linear luminescence is provided. The body isThe cross section that guides the lightHas a short side and a long side longer than the short sideA quadrilateral light guide, and a light source provided at at least one end in the length direction of the light guideAnd have,The light guide receives the light from the light source andSaidThe four sides in cross sectionOne of the shapesTwo shortSideThe surface that becomesA light-emitting surface that emits light to the outside,The long side Thickness andFacing the light emitting surfacesurfaceWas provided with a light reflection layer. When the light reflected from the light reflecting layer radiates to the outside, the light emitting surface of the light guide is flat, so the light reflected from the light reflecting layer goes straight to the outside and radiates, and diffuses. It becomes difficult. Therefore, clear linear light emission can be obtained.
[0012]
Further, the linear light-emitting body of the present invention is used as a light guide that surrounds an outer peripheral portion of a heating coil provided corresponding to a heating unit on a top plate of the induction heating cooker. The light entering the light guide was emitted in the direction of the top plate over a part or the entire circumference of the induction heating coil. Thus, with a simple configuration, light is emitted over a part or the entire circumference of the induction heating coil, so that the heating unit can be clearly displayed on the top plate.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 isA light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, wherein the linear luminescence is provided. The body is a quadrilateral having a cross section for guiding light having a short side and a long side longer than the short side, andFormed in an annular shapeA light guide, a light introduction part formed in a part of the light guide, and a light source, wherein the light guide receives the light from the light source and forms the quadrilateral in the cross section. A simple configuration in which a surface serving as one short side is a light emitting surface that radiates the light to the outside, the long side is a thickness, and a light reflecting layer is provided on a surface facing the light emitting surface. Thus, since the light is emitted over a part or the entire circumference of the induction heating coil, the heating portion can be clearly displayed on the top plate. Further, the cooling air can be efficiently taken in from below the induction heating coil to cool the induction heating coil.
[0014]
Also,A light guide having a quadrangular cross section that guides light, and a light source provided at at least one end in the length direction of the light guide, and a light emitting surface that emits light to one side of the square to the outside, When the light reflecting layer is provided on the side facing the light emitting surface, the light reflecting surface of the light guide is flat when the light reflected from the light reflecting layer radiates to the outside. The reflected light goes straight to the outside and radiates, making it difficult to diffuse. Therefore, clear linear light emission can be obtained.
[0015]
Further, the linear light-emitting body is a quadrilateral light guide having a cross section for guiding light having a short side and a long side longer than the short side, and a light source provided at at least one end in the length direction of the light guide. And the light guide is a light-emitting surface that emits the light to the outside, the surface being one of the short sides of the quadrilateral in the cross section while the light is incident from the light source, and the long side is By increasing the thickness, the irradiation of light from the light emitting surface can be suppressed, and the amount of light that propagates can be increased. Therefore, a large amount of light can be propagated far.
[0016]
Claim2The invention described inA light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, wherein the linear luminescence is provided. The body isThe cross section that guides the lightHas a short side and a long side longer than the short sideA quadrilateral light guide, and a light source provided at at least one end in the length direction of the light guideAnd have,The light guide receives the light from the light source andSaidThe four sides in cross sectionOne of the shapesTwo shortSideThe surface that becomesA light-emitting surface that emits light to the outside,The long side is a thickness,Facing the light emitting surfacesurfaceBy overlapping the reflective material that reflects light on theWith a simple configuration, light is emitted over part or the entire circumference of the induction heating coil, so that the heating section can be clearly displayed on the top plate.
[0017]
Further, the linear light-emitting body is a quadrilateral light guide having a cross section for guiding light having a short side and a long side longer than the short side, and a light source provided at at least one end in the length direction of the light guide. And the light guide is a light-emitting surface that emits the light to the outside, the surface being one of the short sides of the quadrilateral in the cross section while the light is incident from the light source, and the long side is By increasing the thickness, the irradiation of light from the light emitting surface can be suppressed, and the amount of light that propagates can be increased. Therefore, a large amount of light can be propagated far.
[0018]
Further, the light reflected by the reflecting material can be applied to the outside from the light emitting surface. Further, by changing the color of the reflecting material, the color to be radiated from the light emitting surface to the outside can be selected.
[0019]
Claim3The invention described inA light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, wherein the linear luminescence is provided. The body is a quadrilateral having a cross section for guiding light having a short side and a long side longer than the short side, andFormed in an annular shapeA light guide, a light introduction part formed in a part of the light guide, and a light source, wherein the light guide receives the light from the light source and forms the quadrilateral in the cross section. A configuration in which one short side is a light emitting surface that emits the light to the outside, the long side is a thickness, and a light reflecting layer is provided on a surface facing the light emitting surface.Thus, for example, the outer peripheral portion of the induction heating coil can be specified.In addition, a light guide having such a shape is generally easily obtained by resin molding.
[0020]
The invention described in claim 4 isA light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, wherein the linear luminescence is provided. The body is a quadrilateral having a cross section for guiding light having a short side and a long side longer than the short side, andFormed in an annular shapeA light guide, a light introduction part formed in a part of the light guide, and a light source, wherein the light guide receives the light from the light source and forms the quadrilateral in the cross section. A surface serving as one short side as a light-emitting surface that emits the light to the outside, a thickness of the long side, and a reflecting material that reflects light on a surface facing the light-emitting surface.Thus, for example, the outer peripheral portion of the induction heating coil can be specified.In addition, a light guide having such a shape is generally easily obtained by resin molding.
[0021]
Claim5The invention described inLinear illuminant,Since a layer having a smaller refractive index of light than the light guide is provided on a surface other than the light emitting surface of the light guide, the light from the light source can be propagated far away because the light is totally reflected on these surfaces. .
[0022]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0023]
(Example 1)
FIG. 1 is a perspective view of a linear light-emitting body 10 according to Embodiment 1 of the present invention.
[0024]
In FIG. 1, reference numeral 11 denotes a light source, such as a light bulb or an LED (light emitting diode). In particular, light emitting diodes are preferable because they have various emission colors and can be selected according to the purpose. Reference numeral 12 denotes a light guide for guiding light incident from the light source 11, and is made of a synthetic resin such as acrylic resin, polycarbonate, polyamide, or polyimide, or a transparent material such as glass. FIG. 1 shows an example in which a quadrilateral having a rectangular cross section is used. Reference numeral 13 denotes a light reflection layer provided on one side of the light guide 12. The light reflecting layer is formed by providing irregularities on the surface by mechanical means such as polishing the surface or chemical means such as etching the surface. The light reflection layer can be obtained by providing an adhesive layer such as silicone rubber or an adhesive layer such as by sticking an adhesive tape. Further, it can be obtained by forming a film containing particles of a metal or a metal oxide such as aluminum oxide, silicon oxide, and titanium oxide.
[0025]
The operation and operation of the linear light-emitting body 10 configured as described above will be described below.
[0026]
Light incident from the light source 11 is guided through the light guide 12. Then, part of the light is reflected by the light reflecting layer 13 and radiated from the light emitting surface 14 to the outside. At this time, the light guide 12 is formed in a quadrangular shape, and the light reflecting layer 13 is provided on one side thereof, so that the light reflected here emits outside from the light emitting surface 14 which is the side corresponding to the light reflecting layer 13. I do. Since the light emitting surface 14 is a flat surface, light emission from the light emitting surface is parallel and hardly diffuses. Therefore, clear linear light emission can be obtained along the light traveling direction of the light guide.
[0027]
Hereinafter, the effect of the light reflecting layer will be described with reference to the perspective view of the light guide of FIG. In FIG. 2, a light guide is made of polycarbonate having a rectangular cross section of width d3 mm and height h15 mm, and silicone rubber (adhesive) is used as the light reflection layer 13. The effect of the light reflecting layer was obtained by measuring the illuminance at a point at a fixed distance of l100 mm from the light source. The illuminance when the light reflection layer 13 was not provided was 0.7 lux, and the illuminance when the light reflection layer 13 was provided only on the surface facing the light emitting surface 14 was 1.79 lux. The illuminance when the light reflecting layer 13 was provided on all surfaces except the light emitting surface 14 was 1.97 lux. From this, it can be seen that providing the light reflecting layer 13 on the surface opposing the light emitting surface 14 significantly increases light emission. It can also be seen that providing the light reflecting layer 13 on a surface other than the surface facing the light emitting surface 14 is not so effective. In each case, clear linear light emission was obtained.
[0028]
The basic structure has been described above, but if the light guide is described below, a more excellent linear light-emitting body can be obtained.
[0029]
That is, if a layer having a smaller refractive index than the light guide is provided on a surface other than the light emitting surface 14 so that light can reach a position far from the light source 11, light transmission loss is reduced. Will arrive.
[0030]
In addition, by making the reflectance of the light reflecting layer 13 different for each portion, light emission from the light emitting surface 14 is different, and a pattern of light intensity can be provided.
[0031]
Further, if the light emitting surface 14 and the surface facing the light emitting surface 14 are mirror surfaces by mechanical or chemical means or the like, light is less likely to leak to the outside due to irregular reflection, and light can reach far. This is also effective if one of the surfaces is performed.
[0032]
Further, the light-emitting surface 14 and the surface facing the light-emitting surface 14 are irregularly-reflected surfaces that irregularly reflect light by mechanical or chemical means or the like, so that light propagating in the light guide is irregularly reflected, and light emitted from the light-emitting surface 14 is The amount can be increased, and clear linear light emission can be obtained.
[0033]
Further, the light emitting surface 14 is configured to be positioned parallel to the traveling direction of light propagating in the light guide 12. With this configuration, the light emitting surface 13 of the light guide 12 is made to emit farther without being affected by the directivity of the light source 11 and since the straight light from the light source arrives without being lost during propagation. be able to.
[0034]
Further, as shown in FIG. 2, in the light guide 12 formed of a square (rectangle) having a short side d and a long side h, when the short side d is the light emitting surface 14, the light from the light source 11 can reach farther. can do. In addition, light can reach farther as the length of the longer side h is longer than the shorter side d. Experimental examples are shown in (Table 1).
[0035]
[Table 1]
Figure 0003584906
[0036]
In Table 1, the power supply voltage of the LED was adjusted so that the point 50 mm from the light source became 0.7 lux, and the illuminance at the points 100 mm and 150 mm from the light source was measured. At this time, the short side d which is the light emitting surface 14 of the light guide 12 was set to 3 mm, and the long side h was changed to 5, 10 and 15 mm. In addition, the viewing angle of the LED was changed. As can be seen from the table, regardless of the viewing angle of the LED, the larger the longer side h, the better the light propagates farther. It is considered that this is because more light is transmitted to the distant place than light emitted from the light emitting surface 14 and lost.
[0037]
Further, as shown in FIG. 2, when the thickness h of the light guide 12 is larger than the thickness t of the light reflection layer 14, the loss of light propagating in the light guide 12 is reduced, and the light of the light source is effectively used. Thus, the light emitting surface 14 can be illuminated far away.
[0038]
In addition, the linear illuminant emits light linearly. Therefore, the shape is not limited to the rod shape, and the shape can be an annular shape, or a triangular or polygonal shape by combining rod-shaped linear light-emitting bodies. In addition, a linear light-emitting body processed into an arbitrary shape can be obtained. In particular, when an annular linear illuminant is used for the induction heating cooker, the outer peripheral portion of the induction heating coil can be clearly shown, and the handling becomes easy.
[0039]
Next, the light source will be described. The radiation intensity of the light from the light guide 12, that is, the luminance, decreases as the distance from the light source 11 increases. Therefore, it is necessary to supplement light in the middle of the light guide 12 to make the irradiation intensity of the light guide 12 almost uniform. In general, a linear luminous body having a total length of about 50 to 70 cm can be obtained by providing light sources 11 on both sides of the linear luminous body as shown in FIG. FIG. 3A shows the case of a rod-shaped linear light emitter, and FIG. 3B shows the case of an annular linear light emitter.
[0040]
FIG. 4 shows another example of supplementing light to an annular linear luminous body. FIG. 4 (a) is a plan view of the linear luminous body, and FIG. 4 (b) is another linear luminous body. It is a perspective view of a light-emitting body. As shown in the figure, a light introducing portion 12a made of the same material as the light guide 12 is provided in a part of the light guide 12. This makes it possible to obtain a linear illuminant that replenishes light and emits light almost uniformly.
[0041]
When an LED is used as a light source as shown in Table 1, the amount of light reaching far differs depending on the viewing angle. Therefore, in order to make the emission of the linear illuminant as uniform as possible, it is practical to set the viewing angle of the LED within 30 to 60 degrees.
[0042]
Note that the uniform light emission in the present invention does not mean optically uniform but means that the appearance or actual feeling is substantially uniform.
[0043]
In the above description, the case where the light reflecting layer 13 is provided integrally with the light guide 12 has been described. However, substantially the same applies even when the light guide and the light reflecting layer are separately provided and these are overlaid and used as one. The effect is obtained. Further, the light guide 12 is inserted into a case having a U-shaped cross section as shown in FIG. 4 (c), or the mating surface of the light guide 12 with the light reflection layer is formed as an arc as shown in FIG. 4 (d). , And the light reflection layer 13 may be inserted in the light reflection layer 13 to provide a light reflection material on at least the surface of the case corresponding to the light emitting surface. Also in these cases, it is a matter of course that substantially the same effects as described above can be obtained even if various processes as described above are performed on the light guide.
[0044]
(Example 2)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0045]
Note that the outer peripheral portion of the induction heating coil in the present embodiment means that the light guide is on the outer periphery of the induction heating coil on the projection surface, and does not specify the positional relationship in the height direction. In this embodiment, the light guide is described as being located on the outer periphery of the induction heating coil.
[0046]
FIG. 5 is an external perspective view of the induction heating cooker used in the present embodiment. As shown in FIG. 5, a translucent top plate 16 is provided on the upper surface of the main body case 15. The top plate 16 is provided with a heating section 17 for heating the pot by induction heating to cook the object to be cooked, and a radiant heater 18 for cooking using a pot that cannot be used for induction heating. A roaster 19 and an operation unit 20 are provided on a front side surface of the main body case 15.
[0047]
FIG. 6 is a cross-sectional view of a main part showing one cross section of the heating unit 17 of FIG. In the figure, a cooking pot 21 is placed on a heating section 17 of a top plate 16. In order to heat the cooking pot 21, an induction heating coil 22 is provided at a lower portion of the top plate 16, that is, at a position corresponding to the cooking pot. Further, the light guide 12 is provided below the top plate 16. By making the size of the light guide 12 large enough to surround the outer peripheral portion of the induction heating coil 22, light emission from the light guide 12 reaches the top plate 16 without being obstructed by the heating coil. The range of the heating section 17 can be clearly displayed on the plate 16. Light emitted from the light source propagates through the light guide 12. Reference numeral 23 denotes a control unit that performs control such as adjustment of heating power during cooking and blinking of the light source 11.
[0048]
FIG. 7 is a plan view of the linear light-emitting body described in the first embodiment. In the present embodiment, the light guide 12 having a rectangular cross section is formed in an annular shape, and two light sources 11 are arranged at both ends of the light guide 12 in total. The inner diameter of the ring is slightly larger than the outer shape of the induction heating coil 22. The light guide having such a shape is generally easily obtained by resin molding.
[0049]
The light emitted from the light source 11 propagates through the light guide 12 while repeating the straight or reflection. In the course of this propagation, light is emitted in the direction of the top 16 and its intensity is attenuated. Since the light radiates in the direction of the top plate 16 while propagating through the light guide 12 in this manner, a figure having the same shape as the upper surface shape of the light guide 12 is displayed on the top plate 16. When a linear luminous body having the shape shown in FIG. 7 is used, a ring is displayed. In particular, in this embodiment, since a light guide having a rectangular cross section is used, diffusion of light can be suppressed, and a clear figure can be displayed.
[0050]
FIG. 8 is a schematic diagram for explaining the relationship between the cooling air and the linear illuminant. In the figure, it is efficient to take in cooling air A for cooling the induction heating coil 22 from below the induction heating coil 22. When one blower fan 24 for generating cooling air is provided and two induction heating coils 22 are provided, the cooling air A enters from a lower part of the first induction heating coil 22a and cools the first induction heating coil 22a. Thereafter, an air passage for cooling the adjacent second induction heating coil 22b and discharging the cooled outside to the outside is provided. At this time, the light source 11 of the second induction heating coil 22b which is cooled later may be exposed to the cooling air A having a higher temperature. In particular, when a semiconductor light emitting element such as an LED is used as the light source 11, not only its life but also its light emitting characteristics are affected by the ambient temperature. Therefore, in such a case, as shown in FIG. 9, the light source 11 of the linear luminous body 10 provided corresponding to the second induction heating coil 22b to be cooled later is provided on the windward side. Thereby, the influence of the temperature of the cooling air A can be reduced.
[0051]
FIG. 10 is a schematic diagram showing a positional relationship between the ferrite 25 radially provided on the bottom surface of the induction heating coil and the linear light-emitting body 10. Ferrite is used to reduce the leakage of magnetic flux. As shown in the drawing, the light source 11 is provided between the extension lines of the ferrite provided in a radial shape, avoiding the extension lines. This is because the magnetic flux is not much reduced on the radial extension, and the light source 11 is easily affected by the magnetic flux.
[0052]
Note that crystallized glass or the like is used for the top plate 16. Usually, the top plate 16 is colored to make the inside invisible. As a coloring method, there are a case where the crystallized glass itself is colored and a case where the crystallized glass is painted and colored. When a figure is displayed on the top plate 16 using the linear illuminant according to the present embodiment, a brighter figure is obtained by applying the heat-resistant translucent paint than by coloring the crystallized glass itself. Was done. The heat-resistant translucent paint can be selected according to the wavelength of light, and different colors can be transmitted through the top plate.
[0053]
(Example 3)
Hereinafter, a third embodiment of the present invention will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.
[0054]
FIG. 11 shows a light emitting body 26 used in this embodiment. This light emitter 26 is concentrically annularly integrated with three light guides 12 of the first embodiment, and at least one light source (not shown) is arranged on each light guide 12, and the outer periphery of the induction heating coil is provided. It is arranged in the department. With this, the type, color, size, or brightness of the light source is changed for each light guide, or the light is turned on, blinked, or turned off, depending on the function of the device, the state of use, the magnitude of the heat, or the use time. Therefore, the number of display patterns can be increased, and the heating section can be grasped visually more easily.
[0055]
(Example 4)
Hereinafter, a fourth embodiment of the present invention will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.
[0056]
FIG. 12 shows a light emitting body 27 used in this embodiment. The luminous body 27 uses four linear luminous bodies 10 of the first embodiment, is integrated in a ring shape, and is arranged on the outer periphery of the induction heating coil. With this, the type, color, size, or brightness of the light source is changed for each light guide, or the light is turned on, blinked, or turned off, depending on the function of the device, the state of use, the magnitude of the heat, or the use time. Therefore, the number of display patterns can be increased, and the heating section can be grasped visually more easily.
[0057]
(Example 5)
Hereinafter, a fifth embodiment of the present invention will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.
[0058]
FIG. 13 shows a light emitting body 28 used in this embodiment. This light emitter 28 uses the three light guides 12 of the first embodiment, provides a light isolation layer 29 between the light guides along the length direction, forms an annular shape, and provides each light guide 12 with a light source. (Not shown) and arranged on the outer periphery of the induction heating coil. This simplifies the configuration, and allows the type, color, size, or brightness of the light source to be changed for each light guide, or to be turned on, blinking, or turned off, depending on the function, use state, or use time of the device. Since the number of display patterns can be increased, the heating section can be visually grasped.
[0059]
In the second to fifth embodiments, the case where light is emitted over the entire circumference of the induction heating coil has been described. However, if necessary, a part of the heating coil such as a half circumference may be used. A figure may be displayed. Further, a portion other than the heating coil may be a portion that is visually distinguished from other portions.
[0060]
As described above, according to the present embodiment, a light guide having a rectangular cross section is used, so that a continuous, clear figure can be drawn on the top plate, instead of a point or a line. In addition, the number of light sources used can be minimized, and the cost can be reduced.
[0061]
【The invention's effect】
As mentioned above,BookAccording to the invention,With a simple configuration,It is possible to obtain a linear luminous body with high reliability and easy to obtain a clear linear shape.By using this linear illuminant.The heating range of the heating unit can be clearly displayed on the top plate of the induction heating cooker.Further, the cooling air can be efficiently taken in from below the induction heating coil to cool the induction heating coil.
[Brief description of the drawings]
FIG. 1 is a perspective view of a linear light-emitting body according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a light guide of the linear light emitter.
FIG. 3A is a plan view of the rod-shaped linear light-emitting body.
(B) A plan view of the ring-shaped linear light emitter
FIG. 4A is another overall plan view of the linear illuminant.
(B) Another overall perspective view of the linear illuminant
(C) Another partial perspective view of the linear illuminant
(D) Another partial perspective view of the linear illuminant
FIG. 5 is an external perspective view of an induction heating cooker according to a second embodiment of the present invention.
FIG. 6 is a sectional view of a main part of the induction heating cooker.
FIG. 7 is a plan view of a linear illuminant used in the induction heating cooker.
FIG. 8 is a schematic diagram of a main part of the induction heating cooker.
FIG. 9 is a schematic view for explaining the position of a light source of the induction heating cooker.
FIG. 10 is a schematic diagram showing a positional relationship between a ferrite and a linear illuminant of the induction heating cooker.
FIG. 11 is a plan view of a luminous body of an induction heating cooker according to a third embodiment of the present invention.
FIG. 12 is a plan view of a luminous body of an induction heating cooker according to a fourth embodiment of the present invention.
FIG. 13 is a perspective view of a luminous body of an induction heating cooker according to a fifth embodiment of the present invention.
FIG. 14 is a perspective view of a conventional linear light-emitting body.
FIG. 15 is a perspective view of a conventional luminous body.
[Explanation of symbols]
10 Linear luminous body
11 Light source
12 Light guide
13 Light reflection layer
14 Emitting surface
15 Body case
16 Top plate
17 heating section
21 Cooking pot (heated cooking container)
22 Induction heating coil
24 blower fan
25 Ferrite
29 Optical isolation layer

Claims (5)

本体ケースの上面に設けた透光性の天板と、前記天板上に設けた被加熱調理容器を載置して誘導加熱により加熱する加熱部と、前記天板の下方に前記加熱部に対応して設けた誘導加熱コイルと、前記誘導加熱コイルの外周部に設けられ前記誘導加熱コイルの一部または全周にわたって前記天板方向に発光する線状発光体とを備え、前記線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形の導光体と、前記導光体の長さ方向の少なくとも一端に設けた光源とを有し前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとし、前記発光面に対向するに光反射層を設ける構成とした誘導加熱調理器 A light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, wherein the linear luminescence is provided. body has a light guide of quadrilateral cross-section for guiding the light having a longer long side than the short side and short side, and a light source provided on at least one end of the length direction of the light guide, the lightguide a surface to be the one of the short sides of the quadrilateral wherein the cross-section make incidence to the light from the light source, the light and the light emitting surface for emitting to the outside, and the thickness of the long side, the An induction heating cooker having a structure in which a light reflecting layer is provided on a surface facing a light emitting surface. 本体ケースの上面に設けた透光性の天板と、前記天板上に設けた被加熱調理容器を載置して誘導加熱により加熱する加熱部と、前記天板の下方に前記加熱部に対応して設けた誘導加熱コイルと、前記誘導加熱コイルの外周部に設けられ前記誘導加熱コイルの一部または全周にわたって前記天板方向に発光する線状発光体とを備え、前記線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形の導光体と、前記導光体の長さ方向の少なくとも一端に設けた光源とを有し前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとし、前記発光面に対向するに光を反射する反射材を重ね合わせる構成とした誘導加熱調理器 A light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, wherein the linear luminescence is provided. body has a light guide of quadrilateral cross-section for guiding the light having a longer long side than the short side and short side, and a light source provided on at least one end of the length direction of the light guide, the lightguide a surface to be the one of the short sides of the quadrilateral wherein the cross-section make incidence to the light from the light source, the light and the light emitting surface for emitting to the outside, and the thickness of the long side, the induction heating tone was configured to superimpose reflective material that reflects light on a surface facing the light emitting surface Vessel. 本体ケースの上面に設けた透光性の天板と、前記天板上に設けた被加熱調理容器を載置して誘導加熱により加熱する加熱部と、前記天板の下方に前記加熱部に対応して設けた誘導加熱コイルと、前記誘導加熱コイルの外周部に設けられ前記誘導加熱コイルの一部または全周にわたって前記天板方向に発光する線状発光体とを備え、前記線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形でかつ円環状に形成された導光体と、前記導光体の一部に形成された光導入部と、光源とを有し、前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短辺となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとし、前記発光面に対向する面に光反射層を設ける構成とした誘導加熱調理器 A light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, wherein the linear luminescence is provided. The body is a quadrilateral and ring- shaped light guide having a cross section for guiding light having a short side and a long side longer than the short side, and a light guide formed in a part of the light guide. And a light source, wherein the light guide is a light emitting surface that emits the light to the outside, the surface being one short side of the quadrilateral in the cross section while receiving the light from the light source. Induction heating in which the long side has a thickness and a light reflecting layer is provided on a surface facing the light emitting surface. Management unit. 本体ケースの上面に設けた透光性の天板と、前記天板上に設けた被加熱調理容器を載置して誘導加熱により加熱する加熱部と、前記天板の下方に前記加熱部に対応して設けた誘導加熱コイルと、前記誘導加熱コイルの外周部に設けられ前記誘導加熱コイルの一部または全周にわたって前記天板方向に発光する線状発光体とを備え、前記線状発光体は、光を導光する断面が短辺と前記短辺より長い長辺を有する四辺形でかつ円環状に形成された導光体と、前記導光体の一部に形成された光導入部と、光源とを有し、前記導光体は、前記光源から前記光を入射するとともに前記断面で前記四辺形の一つの短辺となる面を、前記光を外部に放射する発光面とし、前記長辺を厚みとし、前記発光面に対向する面に光を反射する反射材を重ね合わせる構成とした誘導加熱調理器 A light-transmitting top plate provided on the upper surface of the main body case, a heating unit for placing the container to be heated provided on the top plate and heating by induction heating, and a heating unit below the top plate. An induction heating coil provided correspondingly, and a linear illuminator provided on an outer peripheral portion of the induction heating coil and emitting light in the direction of the top plate over a part or the entire circumference of the induction heating coil, wherein the linear luminescence is provided. The body is a quadrilateral and ring- shaped light guide having a cross section for guiding light having a short side and a long side longer than the short side, and a light guide formed in a part of the light guide. And a light source, wherein the light guide is a light emitting surface that emits the light to the outside, the surface being one short side of the quadrilateral in the cross section while receiving the light from the light source. A structure in which the long side has a thickness and a reflecting material that reflects light is superposed on a surface facing the light emitting surface. And the induction heating cooker. 線状発光体は、導光体の発光面以外の面に導光体より光の屈折率の小さい層を設ける構成とした請求項1または3に記載の誘導加熱調理器The induction heating cooker according to claim 1 , wherein the linear illuminator is provided with a layer having a smaller refractive index of light than the light guide on a surface other than the light emitting surface of the light guide.
JP2001201652A 2001-07-03 2001-07-03 Induction heating cooker Expired - Lifetime JP3584906B2 (en)

Priority Applications (11)

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JP2001201652A JP3584906B2 (en) 2001-07-03 2001-07-03 Induction heating cooker
US10/179,308 US6969834B2 (en) 2001-07-03 2002-06-26 Line type luminous device and induction heating cooker employing same
KR10-2002-0036455A KR100494962B1 (en) 2001-07-03 2002-06-27 Line type luminous device and induction heating cooker employing same
FR0208281A FR2827114B1 (en) 2001-07-03 2002-07-02 ONLINE LIGHTING DEVICE AND INDUCTION HEATING COOKING APPARATUS USING THE SAME
CN2010102905467A CN101982146B (en) 2001-07-03 2002-07-03 Linear emitter and induction cooking device using the same
CN2010102905471A CN101982147B (en) 2001-07-03 2002-07-03 Linear emitter and induction cooking device using the same
CN2010102905503A CN101982148B (en) 2001-07-03 2002-07-03 Linear emitter and induction cooking device using the same
CN2010102905541A CN101982150B (en) 2001-07-03 2002-07-03 Induction heating cooker
CN021405301A CN1395059B (en) 2001-07-03 2002-07-03 Linear luminesent device and induction heating cooking utensils using said device
CN2010102905518A CN101982149B (en) 2001-07-03 2002-07-03 Linear emitter and induction cooking device using the same
US11/179,496 US7109450B2 (en) 2001-07-03 2005-07-13 Line type luminous device and induction heating cooker employing same

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JP2004182661A Division JP3888367B2 (en) 2004-06-21 2004-06-21 Induction heating cooker
JP2004182660A Division JP3938165B2 (en) 2004-06-21 2004-06-21 Induction heating cooker
JP2004182658A Division JP3938163B2 (en) 2004-06-21 2004-06-21 Induction heating cooker

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Cited By (4)

* Cited by examiner, † Cited by third party
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JP2004265880A (en) * 2004-06-21 2004-09-24 Matsushita Electric Ind Co Ltd Induction heating cooker
JP2004273468A (en) * 2004-06-21 2004-09-30 Matsushita Electric Ind Co Ltd Induction heating cooking device
JP2004335481A (en) * 2004-06-21 2004-11-25 Matsushita Electric Ind Co Ltd Induction heating cooker
JP2012049097A (en) * 2010-06-28 2012-03-08 Panasonic Corp Heating cooker

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JP4133408B2 (en) 2003-02-14 2008-08-13 株式会社東芝 Induction heating cooker
KR100851460B1 (en) * 2004-05-10 2008-08-08 가부시끼가이샤 도시바 Heating cooking apparatus
JP4912213B2 (en) * 2007-05-09 2012-04-11 三菱電機株式会社 Cooker
JP2009059493A (en) * 2007-08-30 2009-03-19 Panasonic Corp Induction heating cooker
FR2967236B1 (en) * 2010-11-04 2014-10-10 Eurokera LUMINOUS VITROCERAMIC ARTICLE
EP2947960B1 (en) 2013-01-17 2020-08-26 Panasonic Intellectual Property Management Co., Ltd. Induction cooking device
JP7077253B2 (en) 2019-03-01 2022-05-30 石塚硝子株式会社 Plate for tableware

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004265880A (en) * 2004-06-21 2004-09-24 Matsushita Electric Ind Co Ltd Induction heating cooker
JP2004273468A (en) * 2004-06-21 2004-09-30 Matsushita Electric Ind Co Ltd Induction heating cooking device
JP2004335481A (en) * 2004-06-21 2004-11-25 Matsushita Electric Ind Co Ltd Induction heating cooker
JP2012049097A (en) * 2010-06-28 2012-03-08 Panasonic Corp Heating cooker

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