JP3573132B2 - Induction heating cooker - Google Patents

Induction heating cooker Download PDF

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Publication number
JP3573132B2
JP3573132B2 JP2002029253A JP2002029253A JP3573132B2 JP 3573132 B2 JP3573132 B2 JP 3573132B2 JP 2002029253 A JP2002029253 A JP 2002029253A JP 2002029253 A JP2002029253 A JP 2002029253A JP 3573132 B2 JP3573132 B2 JP 3573132B2
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JP
Japan
Prior art keywords
light
heating
top plate
light guide
heating coil
Prior art date
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Expired - Fee Related
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JP2002029253A
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Japanese (ja)
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JP2002237378A (en
Inventor
勝行 相原
繁三 大西
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
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    • 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
    • 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

Description

【0001】
【発明の属する技術分野】
本発明は、誘導加熱調理器に関し、特に天板上の表示に関するものである。
【0002】
【従来の技術】
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。
【0003】
この課題を解決するために、例えば、特許公報第2903561号に記載されているようなものがあった。図5において天板1の下方に設けられた被加熱鍋を誘導加熱により加熱する加熱コイル2と、この加熱コイル2の周辺に配された電球3から構成されている。そして、加熱動作と同時に加熱コイル2の周辺に配した電球3が点灯し加熱範囲を表示すること、及び本体上面に設けた鉄板の下面に受光により発光する物質を張り付け、鍋を載置して加熱動作を開始すると加熱コイルの中央に設けた電球3が発光し、その光を受け前記物質が二次発光することにより天板上に図6に示すような円4を表示することが開示されている。
【0004】
また、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。
【0005】
【発明が解決しようとする課題】
しかしながら、前記従来の構成では加熱コイル2の周辺に発光手段、例えば電球3を配した形なので、加熱コイル2に対応する加熱部の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いという問題があった。
【0006】
さらに、二次発光を利用した表示方法は円等の図形を比較的簡単に描くことができるが、二次発光の発光効率が悪く表示が薄くて見えにくい、また加熱コイルの中央に配した電球3の光を利用するため、電球の指向性や取り付けばらつきのため、はっきりした図形を描きにくい、さらに二次発光物質が高温の天板の下に設けられるために安定性がよくないという問題があり、いまだに実用化されていない。
【0007】
本発明は従来の課題を解決するもので、加熱コイルに対応する加熱部の加熱範囲周辺を数少ない光源で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。
【0008】
【課題を解決するための手段】
本発明は前記課題を解決するために、天板上の加熱部に対応して設けた加熱コイルの周辺を囲む導光体を設ける構成とした。そしてこの導光体はその下部に光の反射層を設け一端から入った光を前記加熱コイル全周にわたって前記天板方向に発光するようにした。これによって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。さらに、導光体の下部に設けた光反射層の反射率を部分ごとに異ならすことにより、天板上に濃淡の異なる図形を描くことができ、あるいは、導光体の外形をドーナツ状にすることにより、円形の加熱コイルに対しては加熱部を明確に表示できる。
【0009】
【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加熱コイルと、前記加熱コイルの外周部に設けた導光体と、前記導光体に光を発する光源とを備え、前記導光体はその下部に光反射率が部分ごとに異なる光の反射層を設けるとともに、前記光源の光を入力しその光を前記加熱コイルの外周部の一部または全周にわたって前記天板方向に発光する構成としたことにより、天板上に連続した鮮明な図形を表示するので、加熱状態を容易に確認することができる。また、導光体の下部に設けた光反射層の反射率が部分ごとに異なる構成としたことにより、天板上に濃淡の異なる図形を描くことができる。
【0010】
また、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加熱コイルと、前記加熱コイルの外周部に設けた導光体と、前記導光体に光を発する光源とを備え、前記導光体は外形をドーナツ状にするとともに、その下部に光の反射層を設けて、前記光源の光を入力しその光を前記加熱コイルの外周部の一部または全周にわたって前記天板方向に発光する構成とした導光体の外形をドーナツ状にする構成としたことにより、天板上に連続した鮮明な図形を表示するので、加熱状態を容易に確認することができる。また、円形の加熱コイルに対しては加熱部を明確に表示できる。
【0011】
また、請求項に記載の発明は、特に、導光体の光路に対する直角方向の断面は、円形、四角形またはそれに準ずる形状としたことにより、このような導光体を、樹脂成型により容易に得ることができる。
【0012】
【実施例】
以下、本発明の実施例について図面を用いて説明する。
【0013】
なお本発明でいう加熱コイルの外周部とは投影面で導光体が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加熱コイルの下方にあるとして説明する。
【0014】
図2は本発明に用いる誘導加熱調理器の斜視図である。図2に示すように本体ケース5の上面に透光性の天板6が設けられている。この天板6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7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8とが設けられている。また本体ケース5の前方側面には焙焼器9と操作部10とが設けられている。
【0015】
図1は図2の加熱コイル7のどちらか一方の断面を示す要部断面図である。図において天板6の加熱部7上に調理鍋11が載置される。この調理鍋11を加熱するために天板6の下部の加熱部7すなわち調理鍋に対応する位置に加熱コイル12を設けている。さらに加熱コイル12の下方に導光体13を設けている。そして、この導光体13の大きさを加熱コイル12の外周部を囲う程度の大きさにすることにより導光体13よりの発光が加熱コイルに妨げられることなく天板6に達し、天板6上に加熱部7の範囲を明確に表示するようにすることができる。導光体としては、アクリル樹脂、ポリカーボネイト樹脂やガラスなど光の透過性能のよい材料を用いる。14は電球やLED(半導体発光素子)などからなる光源で、この光源から発した光が導光体を伝播する。15は制御部で調理にあたっての火力の調節や光源14の点滅などの制御を行う。
【0016】
図3は本発明の特徴である一つの導光体と一つの光源とを一組とした発光手段の構成を示す平面図である。
【0017】
図3において、導光体13は円形の加熱コイル12に対応しドーナツ状の円形とし、導光体13の内径は加熱コイル12の外形よりやや大きくしてある。なお、導光体の光路に対する直角方向に対する断面は円形、四角形またはそれに準ずる形状であればよい。そして、このような導光体は一般的には樹脂成型により容易に得られる。
【0018】
導光体13の光の入力位置には光源室16を設け、そこに本実施例では1個の電球14を設置している。光源室16は導光体13方向以外には光が放射しないように反射板で囲んでいる。電球14から発した光は導光体13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6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13を伝播しながら天板6方向に光を放射していくので天板6には導光体13の上面形状と同じ形状の図形が表示される。図3においては円が表示されることになる。
【0019】
光の伝播中に光が天板6方向以外に放射されると、その強度が減衰するので、それを抑えるために、導光体上部の天板方向への発光部分以外には反射層を設けている。この反射層としては、アルミニウム、ステンレスなどの金属箔または板を用いてもよいし、金属や金属酸化物の蒸着またはスパッタを用いて形成してもよい。さらに塗装や化学的方法により反射膜を作る方法もある。いずれにせよ反射膜を設けることにより天板6方向への光の減衰を抑えることができる。
【0020】
図4は天板6方向への発光を均一にするための導光体の構成を説明するための樹脂成型により得られた導光体の展開図であり、例えば図3はこのような形状の導光体13を丸め円形にしたものである。図に示すように導光体13は発光する上部13aを水平とし光を反射する下部13bに勾配を設けた形状としている。すなわち、光を反射する下部13bと、発光する上部13aとの間隔が光源14より離れるにしたがい短くなっている。これにより、上部13aからの間隔が短いpから入射した光は光源14より離れた距離l2で下部13bにぶつかり反射し上部13aに向かう。また、上部からの間隔がより長い位置qから入射した光は光源14に近い距離l1で下部13bにぶつかり反射し上部13aへ向かう。このようにすることにより導光体13の上部13aから均一に発光することができ、天板6上に光強度が均一の図形を描くことができる。
【0021】
次に導光体の下部13bに反射層を設ける方法について述べる。反射層のうち乱反射層の設け方としては、下部13bの表面を機械的に研磨し凹凸を設ける。あるいは化学的にエッチングしてもよい。このときエッチングにより凹凸面が得にくいときはマスキングを併用して行うとよい。また導光体13を樹脂成型で行う時下部13bに微細な凹凸ができるようにしてもよい。さらに下部13bの表面に同種または異種の物質を吹き付けなどにより付着させ凹凸を設けてもよい。このようにして得られた凹凸面に金属粉等を付着させると乱反射層が得られる。この乱反射層に光が入射すると四囲に拡散反射するので発光の均一性が得られやすい。
【0022】
また、鏡面反射層の設け方としては導光体下部13bに前述したように蒸着、スッパタまたは塗装により金属紛による層を設ける方法あるいは金属箔または板を貼り付けるなどの方法により得ることができる。このような鏡面反射層は下部13bに勾配が設けられている場合特に有効で上部13aからの発光を均一にすることができる。
【0023】
また、下部13bに勾配がある場合樹脂成型時に下部13bの面に鋸歯状に多数の連続したプリズムを設け、このプリズムにより入射光を反射して上部13aから発光するようにしても均一に発光することができる。
【0024】
さらに、光の反射層を設ける方法としては導光体13の光の屈折率よりも屈折率の小さい物質で導光体13を覆い、両者の界面で全反射させるようにしてもよい。
【0025】
前記実施例では光源より入射した光を導光体13全体にわたって均一に発光させることを目的とした場合について説明したが、天板6上に濃淡のある図形を表示したい場合は導光体13の下部13bの反射率を部分的に変えるために下部13bの粗面度を変えたり、下部13bに勾配のある場合は勾配を変えたりして不均一に表示させることができる。
【0026】
また加熱コイルの外周が長く、一つの光源では光源から離れた位置では発光強度が低くなってしまう場合は光源と半円状の導光体とを1組とし、2組用いるようにすればよい。必要に応じてこの組数を増やしていけばよい。
【0027】
以上述べた実施例では導光体の外形としては円形の場合につき述べたが先にも述べたように四角形、または円や四角形に準じる形であればよいのは勿論である。ただし、加熱コイルは一般的には円形であるため導光体も円形とすると加熱コイルの位置すなわち加熱部の位置もはっきりとし、しかも安定感に優れているので好ましい。
【0028】
なお、本発明では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。
【0029】
以上のように、本実施例に拠れば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なのでコスト的にも安価にできる。
【0030】
【発明の効果】
本発明によれば光源と、その光源の光を受け加熱コイル外周の一部または全体にわたって発行する導光体より構成しているので、天板上に連続した鮮明な図形を表示することができ加熱状態を容易に視覚的にとらまえることができる。しかも光源の数を最小限としているので、生産性及びコストの面で優れたものとすることができる。さらに、請求項1に記載の発明によれば、天板上に濃淡の異なる図形を描くことができ、請求項2に記載の発明によれば、円形の加熱コイルに対して加熱部を明確に表示することができる。
【図面の簡単な説明】
【図1】本発明の一実施例の誘導加熱調理器の要部断面図
【図2】誘導加熱調理器の外観斜視図
【図3】本発明の一実施例の誘導加熱調理器の発光手段の平面図
【図4】同誘導加熱調理器の導光体の展開図
【図5】従来の誘導加熱調理器の要部断面図
【図6】従来の誘導加熱調理器の表示図形の例を示す図
【符号の説明】
5 本体ケース
6 天板
7 加熱部
12 加熱コイル
13 導光体
14 光源
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an induction heating cooker, and more particularly to a display on a top plate.
[0002]
[Prior art]
The induction heating cooker applies a high-frequency current to the heating coil, generates a high-frequency magnetic field, generates Joule heat by a eddy current in a pot (load) magnetically coupled to the heating coil, and heats the pot itself to perform cooking. It is a cooker. 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.
[0003]
In order to solve this problem, for example, there has been one described in Japanese Patent Publication No. 2903561. 5, a heating coil 2 is provided below the top plate 1 for heating a heated pot by induction heating, and a light bulb 3 arranged around the heating coil 2. Then, at the same time as the heating operation, the bulb 3 arranged around the heating coil 2 is turned on to indicate the heating range, and a substance that emits light by receiving light is attached to the lower surface of the iron plate provided on the upper surface of the main body, and the pot is placed. It is disclosed that when a heating operation is started, a light bulb 3 provided at the center of a heating coil emits light, and the light is secondarily emitted by the light to display a circle 4 as shown in FIG. 6 on a top plate. ing.
[0004]
In Japanese Patent Application Laid-Open No. 7-313279, a plurality of light emitting diodes for heating display are provided annularly on the outer periphery of a heating coil and a light emitting diode for heating power display is provided near the outside of the heating coil. It is described that the display light emitting diode emits light and the heating state can be recognized.
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned conventional configuration, since the light emitting means, for example, the electric bulb 3 is arranged around the heating coil 2, a plurality of electric bulbs are required to display the heating part of the heating part corresponding to the heating coil 2. . Also, when the number of light bulbs is limited, there is a problem that the whole is difficult to understand because of the point display.
[0006]
In addition, the display method using secondary light emission can relatively easily draw a figure such as a circle, but the light emission efficiency of the secondary light emission is poor and the display is thin and difficult to see, and the light bulb arranged in the center of the heating coil Due to the use of the light of No.3, it is difficult to draw a clear figure due to the directivity and mounting variation of the light bulb, and the stability is poor because the secondary luminescent material is provided under the hot top plate. Yes, not yet in practical use.
[0007]
An object of the present invention is to solve the conventional problem, and an object of the present invention is to provide an induction heating cooker capable of clearly displaying the periphery of a heating range of a heating unit corresponding to a heating coil with a few light sources.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention has a configuration in which a light guide is provided which surrounds a heating coil provided corresponding to a heating unit on a top plate. The light guide was provided with a light reflection layer under the light guide, and emitted light from one end in the direction of the top plate over the entire circumference of the heating coil. As a result, light is emitted over the entire circumference, so that the heating section can be clearly displayed on the top plate. Furthermore, by making the reflectivity of the light reflection layer provided under the light guide different for each part, it is possible to draw figures with different shades on the top plate, or to make the outer shape of the light guide into a donut shape By doing so, the heating section can be clearly displayed for the circular heating coil.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1, wherein a translucent top plate provided on the upper surface of the main body case, a heating unit that places a heated cooking container provided on the top plate and heats the container by induction heating, A heating coil provided below the top plate corresponding to the heating unit, a light guide provided on an outer peripheral portion of the heating coil, and a light source for emitting light to the light guide, the light guide comprising: A structure in which a light reflection layer having a different light reflectance for each portion is provided below the light source, and the light of the light source is input and the light is emitted in the direction of the top plate over a part or the entire circumference of the outer periphery of the heating coil. As a result, continuous clear graphics are displayed on the top plate, so that the heating state can be easily confirmed. Further, since the reflectance of the light reflection layer provided under the light guide is different for each portion, it is possible to draw a figure with different shades on the top plate.
[0010]
In addition, the invention according to claim 2 includes a light-transmitting top plate provided on the upper surface of the main body case, and a heating unit that mounts a heated cooking container provided on the top plate and heats the container by induction heating. A heating coil provided below the top plate corresponding to the heating unit, a light guide provided on an outer peripheral portion of the heating coil, and a light source for emitting light to the light guide, The body has a donut shape, and a light reflection layer is provided below the body to receive light from the light source and emit the light in the direction of the top plate over a part or the entire circumference of the heating coil. By adopting a configuration in which the outer shape of the light guide has a donut shape, continuous clear graphics are displayed on the top plate, so that the heating state can be easily confirmed. Further, the heating section can be clearly displayed for the circular heating coil.
[0011]
The invention according to claim 3, in particular, a section perpendicular with respect to the optical path of the light guide body is circular, the fact that the square or the equivalent shape, such light guide, facilitated by tree butter molding Ru can be obtained Rukoto to.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
Note that the outer peripheral portion of the heating coil in the present invention means that the light guide is on the outer periphery of the heating coil on the projection surface, and does not specify the positional relationship in the height direction. In the example, the light guide is described as being below the heating coil.
[0014]
FIG. 2 is a perspective view of the induction heating cooker used in the present invention. As shown in FIG. 2, a translucent top plate 6 is provided on the upper surface of the main body case 5. The top plate 6 is provided with a heating section 7 for heating the pot by induction heating and cooking the object to be cooked, and a radiant heater 8 for cooking using a pot that cannot be used for induction heating. A roaster 9 and an operation unit 10 are provided on a front side surface of the main body case 5.
[0015]
FIG. 1 is a cross-sectional view of a main part showing a cross section of one of the heating coils 7 of FIG. In the figure, a cooking pot 11 is placed on a heating section 7 of a top plate 6. In order to heat the cooking pot 11, a heating coil 12 is provided in a lower portion of the top plate 6, that is, at a position corresponding to the cooking pot. Further, a light guide 13 is provided below the heating coil 12. By making the size of the light guide 13 large enough to surround the outer peripheral portion of the heating coil 12, light emission from the light guide 13 reaches the top plate 6 without being hindered by the heating coil. The area of the heating section 7 can be clearly displayed on the area 6. As the light guide, a material having good light transmission performance, such as an acrylic resin, a polycarbonate resin, or glass, is used. A light source 14 includes a light bulb, an LED (semiconductor light emitting element), and the like, and light emitted from the light source propagates through the light guide. Reference numeral 15 denotes a control unit that controls the heating power for cooking and the blinking of the light source 14.
[0016]
FIG. 3 is a plan view showing a configuration of a light emitting unit in which one light guide and one light source, which are a feature of the present invention, are paired.
[0017]
In FIG. 3, the light guide 13 is a donut-shaped circle corresponding to the circular heating coil 12, and the inner diameter of the light guide 13 is slightly larger than the outer shape of the heating coil 12. The cross section of the light guide in a direction perpendicular to the optical path may be a circle, a square, or a similar shape. And such a light guide is generally easily obtained by resin molding.
[0018]
A light source chamber 16 is provided at a light input position of the light guide 13, and one light bulb 14 is installed therein in this embodiment. The light source chamber 16 is surrounded by a reflector so that light is not emitted in directions other than the direction of the light guide 13. Light emitted from the light bulb 14 propagates through the light guide 13 while repeating straight or reflection. In the course of this propagation, light is emitted in the direction of the top 6 and its intensity is attenuated. As described above, the light radiates in the direction of the top plate 6 while propagating through the light guide 13, so that a figure having the same shape as the upper surface shape of the light guide 13 is displayed on the top plate 6. In FIG. 3, a circle is displayed.
[0019]
If light is emitted in the direction other than the top plate 6 during light propagation, its intensity will be attenuated. To suppress this, a reflective layer is provided on the upper part of the light guide other than the light emitting portion in the direction of the top plate. ing. This reflective layer may be a metal foil or plate of aluminum, stainless steel, or the like, or may be formed by vapor deposition or sputtering of a metal or metal oxide. Further, there is a method of forming a reflective film by painting or a chemical method. In any case, by providing the reflective film, the attenuation of light in the direction of the top plate 6 can be suppressed.
[0020]
FIG. 4 is a development view of a light guide obtained by resin molding for explaining the configuration of the light guide for uniform light emission in the direction of the top plate 6. For example, FIG. The light guide 13 is made round and circular. As shown in the figure, the light guide 13 has a shape in which the upper part 13a that emits light is horizontal and the lower part 13b that reflects light has a gradient. That is, the distance between the lower part 13b that reflects light and the upper part 13a that emits light becomes shorter as the distance from the light source 14 increases. As a result, the light incident from p with a short distance from the upper part 13a collides with the lower part 13b at a distance l2 away from the light source 14 and is reflected toward the upper part 13a. Light incident from a position q having a longer distance from the upper portion hits the lower portion 13b at a distance 11 close to the light source 14 and is reflected and travels toward the upper portion 13a. By doing so, it is possible to uniformly emit light from the upper portion 13a of the light guide 13, and it is possible to draw a figure with uniform light intensity on the top plate 6.
[0021]
Next, a method of providing a reflection layer on the lower portion 13b of the light guide will be described. As a method of providing the irregular reflection layer in the reflection layer, the surface of the lower portion 13b is mechanically polished to provide irregularities. Alternatively, it may be chemically etched. At this time, when it is difficult to obtain an uneven surface by etching, it is preferable to use masking in combination. Further, when the light guide 13 is formed by resin molding, fine irregularities may be formed on the lower portion 13b. Further, the same or different material may be attached to the surface of the lower portion 13b by spraying or the like to form irregularities. When a metal powder or the like is adhered to the uneven surface thus obtained, a diffuse reflection layer is obtained. When light is incident on the irregular reflection layer, the light is diffusely reflected in four directions, so that uniformity of light emission can be easily obtained.
[0022]
The mirror reflection layer can be provided by a method of providing a layer of metal powder on the lower part 13b of the light guide by vapor deposition, sputtering or painting as described above, or by attaching a metal foil or plate. Such a specular reflection layer is particularly effective when a gradient is provided in the lower portion 13b, and can uniformly emit light from the upper portion 13a.
[0023]
When there is a gradient in the lower part 13b, a large number of continuous prisms are provided in a saw-tooth shape on the surface of the lower part 13b during resin molding, and this prism reflects incident light and emits light from the upper part 13a, so that light is emitted uniformly. be able to.
[0024]
Further, as a method of providing the light reflecting layer, the light guide 13 may be covered with a substance having a lower refractive index than the light of the light guide 13 so that the light is totally reflected at an interface between the two.
[0025]
In the above-described embodiment, a case has been described in which the light incident from the light source is intended to be uniformly emitted over the entire light guide 13. The roughness of the lower portion 13b can be changed to partially change the reflectivity of the lower portion 13b, and if the lower portion 13b has a gradient, the gradient can be changed to display unevenness.
[0026]
In the case where the outer circumference of the heating coil is long and the light emission intensity of one light source is low at a position away from the light source, one set of the light source and the semicircular light guide may be used. . The number of sets may be increased as needed.
[0027]
In the above-described embodiment, the case where the outer shape of the light guide is circular is described. However, as described above, it is needless to say that the light guide may have a shape similar to a square or a circle or a square. However, since the heating coil is generally circular, it is preferable to make the light guide also circular because the position of the heating coil, that is, the position of the heating section is clear and the stability is excellent.
[0028]
In the present invention, the case where light is emitted over the entire circumference of the heating coil has been described. However, a part of the heating coil such as a half circumference may be used as necessary.
[0029]
As described above, according to the present embodiment, it is possible to draw a continuous, vivid figure over the entire table, instead of a point or a line, on the tabletop. In addition, since the number of light sources used is minimal, the cost can be reduced.
[0030]
【The invention's effect】
According to the present invention, since the light source and the light guide that receives light from the light source and emits light over a part or the whole of the outer periphery of the heating coil, a continuous clear figure can be displayed on the top plate. The heating state can be easily visually grasped. Moreover, since the number of light sources is minimized, it is possible to improve productivity and cost. Furthermore, according to the first aspect of the present invention, figures having different shades can be drawn on the top plate. According to the second aspect of the present invention, the heating unit is clearly defined for the circular heating coil. Can be displayed.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part of an induction heating cooker according to one embodiment of the present invention. FIG. 2 is an external perspective view of the induction heating cooker. FIG. 3 is a light emitting means of the induction heating cooker according to one embodiment of the present invention. FIG. 4 is a developed view of a light guide of the induction heating cooker. FIG. 5 is a cross-sectional view of a main part of the conventional induction heating cooker. FIG. 6 is an example of a display figure of the conventional induction heating cooker. Diagrams [Description of symbols]
5 Body case 6 Top plate 7 Heating section 12 Heating coil 13 Light guide 14 Light source

Claims (3)

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加熱コイルと、前記加熱コイルの外周部に設けた導光体と、前記導光体に光を発する光源とを備え、前記導光体はその下部に光反射率が部分ごとに異なる光の反射層を設けるとともに、前記光源の光を入力しその光を前記加熱コイルの外周部の一部または全周にわたって前記天板方向に発光す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. A heating coil provided correspondingly, a light guide provided on an outer peripheral portion of the heating coil, and a light source that emits light to the light guide, wherein the light guide has a light reflectance at a lower portion for each part. different provided with a reflective layer of optical, induction heating cooker which is configured to emit the light to enter the light of the light source in the top plate direction over a portion or the entire circumference of the outer peripheral portion of the heating coil. 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加熱コイルと、前記加熱コイルの外周部に設けた導光体と、前記導光体に光を発する光源とを備え、前記導光体は外形をドーナツ状にするとともに、その下部に光の反射層を設けて、前記光源の光を入力しその光を前記加熱コイルの外周部の一部または全周にわたって前記天板方向に発光す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. A heating coil provided correspondingly, a light guide provided on an outer peripheral portion of the heating coil, and a light source that emits light to the light guide, the light guide having a donut-shaped outer shape, lower in providing a reflective layer of optical, induction heating cooker which entered the light the light of the light source and configured to emit light in the top plate direction over a portion or the entire circumference of the outer peripheral portion of the heating coil. 導光体の光路に対する直角方向の断面は、円形、四角形またはそれに準ずる形状とした請求項1または2に記載の誘導加熱調理器。A section perpendicular with respect to the optical path of the light guide body is circular, the induction heating cooker according to claim 1 or 2 and a square or the equivalent shape.
JP2002029253A 2002-02-06 2002-02-06 Induction heating cooker Expired - Fee Related JP3573132B2 (en)

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Related Parent Applications (1)

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JP2000145180A Division JP2001326064A (en) 1999-12-02 2000-05-17 Induction heating cooker

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