JP2615497B2 - High frequency heating equipment - Google Patents
High frequency heating equipmentInfo
- Publication number
- JP2615497B2 JP2615497B2 JP1223530A JP22353089A JP2615497B2 JP 2615497 B2 JP2615497 B2 JP 2615497B2 JP 1223530 A JP1223530 A JP 1223530A JP 22353089 A JP22353089 A JP 22353089A JP 2615497 B2 JP2615497 B2 JP 2615497B2
- Authority
- JP
- Japan
- Prior art keywords
- food
- frequency
- detection
- thawing
- temperature
- 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
Links
Landscapes
- Electric Ovens (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、食品の解凍の自動化を達成する高周波加熱
装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device for achieving automatic thawing of food.
従来の技術 従来、この種の高周波加熱装置（以後電子レンジと呼
ぶ。）の解凍状態の自動化を達成する例としては、第６
図に示すようにターンテーブル20上の食品の重量を検出
してその重量に対応した加熱シーケンスを制御手段であ
るマイコンにより駆動手段を制御し、高周波放射手段の
出力の制御を行うものであった。すなわち、重量センサ
21で、ある食品の重量を検出したならば、対応する重量
に対し初期に決められた時間最大電力で加熱し、以後駆
動手段のオンオフを繰り返すことによって単位時間あた
りの高周波放射手段の出力を低下させる制御を行ってい
た。また、特開昭59−207595号公報にみられるように食
品の解凍状態を食品の誘電体損失の温度依存性と、微弱
電波の送受信による発振周波数帯における検波出力との
関係から間接的に把握し、加熱室内に設けたアンテナで
微弱電波を受信し、その信号変化によって高周波放射手
段の出力の制御を行う制御手段で構成する例もある。こ
のような制御によって食品の解凍を実現していた。2. Description of the Related Art Conventionally, as an example of achieving an automatic thawing state of this type of high-frequency heating device (hereinafter referred to as a microwave oven), there is a sixth example.
As shown in the figure, the weight of the food on the turntable 20 was detected, and a heating sequence corresponding to the weight was controlled by a microcomputer as a control means to control the driving means and control the output of the high-frequency radiation means. . That is, the weight sensor
At 21, if the weight of a certain food is detected, the corresponding weight is heated with the maximum power for the initially determined time, and thereafter, the output of the high-frequency radiating means per unit time is reduced by repeatedly turning on and off the driving means. Had been controlled. In addition, as shown in JP-A-59-207595, the thawing state of food is indirectly grasped from the relationship between the temperature dependence of dielectric loss of food and the detection output in the oscillation frequency band due to the transmission and reception of weak radio waves. There is also an example in which a weak radio wave is received by an antenna provided in the heating chamber, and the output of the high-frequency radiating means is controlled by a change in the signal. Defrosting of food was realized by such control.
発明が解決しようとする課題 しかしながら上記のような構成においては、食品の開
始温度がある決められた温度の場合（例えば冷凍庫温度
−18℃）や、形状が標準（例えば直方体の場合に限り成
立するものであり、食品の解凍開始温度や形状によって
は、食品に煮えすぎの部分が発生したり、未解凍であっ
たりして解凍の仕上がりが不充分であった。また、食品
の重量を測定するための重量センサは、ターンテーブル
が必要条件であり、その構成は食品の重量によるセンサ
の容量変化や、歪信号を検出するものであり構成が複雑
であった。また、検波手段で解凍を検出する場合、検波
手段を置く位置によっては食品の加熱の繰り返しをする
と基板の温度が上昇しその温度特性で検波される電圧が
同じ重量でも異なる場合があった。そこで本発明の目的
は、簡単な構成で安定した食品の解凍を実現することを
目的とするものである。Problems to be Solved by the Invention However, in the configuration as described above, the case is established only when the starting temperature of the food is a predetermined temperature (for example, freezer temperature −18 ° C.) or when the shape is standard (for example, a rectangular parallelepiped). Depending on the thawing start temperature and shape of the food, the food may be over-boiled or unthawed, resulting in an insufficiently thawed finish. Is a necessary condition for the weight sensor to be used, and the configuration is complicated because it detects the change in the sensor capacity due to the weight of the food and the distortion signal, and the detection means detects the defrosting. In this case, depending on the position of the detecting means, if the food is repeatedly heated, the temperature of the substrate rises, and the voltage detected by the temperature characteristic may be different even with the same weight. The purpose is, it is an object of the present invention to realize a thaw stable food with a simple configuration of.
課題を解決するための手段 上記課題を解決するために本発明は、食品の解凍進行
状態を高周波放射手段の周波数帯における食品の誘電体
損失の温度特性から検波手段で検出し、かつ検波手段を
冷却ファン付近に設け、冷却される構成としたものであ
る。Means for Solving the Problems In order to solve the above problems, the present invention is to detect the progress of thawing of the food from the temperature characteristics of the dielectric loss of the food in the frequency band of the high-frequency radiating means by the detecting means, and the detecting means It is provided near the cooling fan and is configured to be cooled.
作用 本発明によれば、検波手段は冷却ファンの冷風によっ
て一定温度に保たれる作用を有する。Operation According to the present invention, the detection means has an operation of maintaining a constant temperature by the cool air of the cooling fan.
実施例 以下、本発明一実施例について添付図面にもとづいて
説明する。第１図は、本発明の一実施例の高周波加熱装
置の本体構成図である。１は食品、２は加熱室、３は高
周波放射手段（以後マグネトロンと呼ぶ）、４はマグネ
トロン３を動作させるための高圧トランス、５はマグネ
トロン３を冷却する冷却ファン、６はアンテナでマグネ
トロン３の発振周波数の1/4波長より短い（本発明で
は、３〜5mm）ものである。７は減衰器、８は、検波手
段、９は検波した信号を増幅する増幅器、10はマグネト
ロン３の高周波電力を可変させる駆動手段、11は増幅後
の検波信号にしたがって駆動手段10の制御を行い、高周
波電力の出力を調整する制御手段（本発明ではマイクロ
コンピューター）である。第２図は、マグネトロン３の
発振信号を検波する検波手段８の回路図である。12は50
オームの抵抗、13は検波ダイオード（例えばショットキ
ーバリアダイオード）、14、15は抵抗、16はコンデンサ
でこれらによってマグネトロン３の発振周波数帯におい
て食品１に吸収されない高周波電力を検波し、電圧VSと
して検出される。なお、７は減衰器であり、マグネトロ
ン３が加熱室２内に放射する高周波電力は数百ワットで
あり、検波手段８に過大の入力が入らないようにするた
のものである。第３図は、検波手段８をマイクロストリ
ップラインで構成した図である。ある誘電率εｒを有す
る誘電体基板17上の銅箔のパターン18、19をエッチング
している。18の銅箔の部分は特性インピーダンス50オー
ムであり、19の部分はアースである。マイクロストリッ
プラインで検波手段８を構成することによって、ライン
の長さを検波する周波数帯にあわせて最適に設計するの
が容易であり、エッチングで行っているので検波精度が
向上するものである。第４図は、食品牛ミンチ肉の重量
に対する検波電圧VSの信号レベル、および極小点Ｔの関
係を示す特性図である。この図から食品の重量に応じて
解凍開始直後の検波電圧、極小点Ｔの検波時間に大きな
差があることがわかる。これは、食品の重量が少ないと
吸収される高周波が少なく相対的にアンテナで検波され
る高周波が多くなるからである。第５図は、加熱室２内
で食品１（冷凍牛ミンチ肉100グラム）を解凍した時の
検波手段８で検波される信号電圧が基板の温度変化によ
って変化を示す特性図である。第５図において基板温度
が上昇すると同じ食品でも検波される電圧が異なること
がわかる。これは食品の解凍の繰り返しにより、基板の
温度が上昇し、基板の誘電率、損失が変化するためであ
る。しかしながら、マグネトロン３を冷却する冷却ファ
ン５で冷風を当てる構成にすると基板の温度上昇は妨げ
るので検波される電圧が異なることはなくなるものであ
る。Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a structural view of a main body of a high-frequency heating device according to one embodiment of the present invention. 1 is a food, 2 is a heating room, 3 is a high-frequency radiation means (hereinafter referred to as a magnetron), 4 is a high-voltage transformer for operating the magnetron 3, 5 is a cooling fan for cooling the magnetron 3, and 6 is an antenna for the magnetron 3. It is shorter than 1/4 wavelength of the oscillation frequency (3 to 5 mm in the present invention). 7 is an attenuator, 8 is detection means, 9 is an amplifier for amplifying the detected signal, 10 is driving means for varying the high frequency power of the magnetron 3, and 11 controls the driving means 10 according to the amplified detection signal. And control means (a microcomputer in the present invention) for adjusting the output of the high-frequency power. FIG. 2 is a circuit diagram of the detecting means 8 for detecting the oscillation signal of the magnetron 3. 12 is 50
An ohmic resistor, 13 is a detection diode (for example, a Schottky barrier diode), 14 and 15 are resistors, and 16 is a capacitor, which detects high-frequency power that is not absorbed by the food 1 in the oscillation frequency band of the magnetron 3 and generates a voltage V S Is detected. Reference numeral 7 denotes an attenuator. The high-frequency power radiated from the magnetron 3 into the heating chamber 2 is several hundred watts, so that an excessive input to the detection means 8 is prevented. FIG. 3 is a diagram in which the detection means 8 is constituted by a microstrip line. The copper foil patterns 18 and 19 on the dielectric substrate 17 having a certain dielectric constant ε r are etched. The copper foil portion 18 has a characteristic impedance of 50 ohms and the portion 19 is ground. By configuring the detection means 8 with a microstrip line, it is easy to optimally design the length of the line in accordance with the frequency band to be detected, and the detection accuracy is improved because etching is performed. Figure 4 is a characteristic diagram showing the relationship between the signal level of the detection voltage V S to the weight of the food beef minced meat, and the minimum point T. From this figure, it can be seen that there is a large difference between the detection voltage immediately after the start of thawing and the detection time of the minimum point T according to the weight of the food. This is because if the weight of the food is small, the high frequency absorbed by the antenna is small and the high frequency detected by the antenna is relatively large. FIG. 5 is a characteristic diagram showing a change in the signal voltage detected by the detection means 8 when the food 1 (100 g of frozen beef minced meat) is thawed in the heating chamber 2 due to a change in the temperature of the substrate. It can be seen from FIG. 5 that when the substrate temperature rises, the detected voltage differs even for the same food. This is because the temperature of the substrate increases due to repeated thawing of the food, and the dielectric constant and loss of the substrate change. However, if the cooling fan 5 that cools the magnetron 3 is configured to blow cold air, the temperature of the substrate is prevented from rising, so that the detected voltage does not differ.
発明の効果 以上述べてきたように本発明によれば、以下に述べる
効果が得られる。Effects of the Invention As described above, according to the present invention, the following effects can be obtained.
高周波放射手段の周波数帯の高周波を、加熱室内に配
したアンテナで検波し、かつ検波手段を冷却ファンで冷
却する構成であるので、食品を繰り返し冷凍しても安定
な解凍の検波ができ、また検波手段を構成する素子の温
度特性の影響も妨げるので失敗なく簡単に解凍検出が達
成できる。High-frequency radiation in the frequency band of the high-frequency radiation means is detected by an antenna arranged in the heating chamber, and the detection means is cooled by a cooling fan, so that stable thawing detection can be performed even if food is repeatedly frozen, and Since the influence of the temperature characteristics of the elements constituting the detection means is also prevented, thawing detection can be easily achieved without failure.
第１図は、本発明の一実施例の高周波加熱装置の本体構
成図、第２図は同検波手段の回路図、第３図は同検波手
段をマイクロストリップラインに構成した図、第４図は
同解凍時における検波手段の食品重量に対する信号の変
化の特性図、第５図は同解凍を繰り返した時の信号の変
化を示す特性図、第６図は従来の高周波加熱装置の本体
構成図である。 １……食品、２……加熱室、３……高周波放射手段、５
……冷却ファン、６……アンテナ、８……検波手段、10
……駆動手段、11……制御手段。FIG. 1 is a block diagram of the main body of a high-frequency heating apparatus according to one embodiment of the present invention, FIG. 2 is a circuit diagram of the detecting means, FIG. 3 is a diagram in which the detecting means is configured as a microstrip line, and FIG. FIG. 5 is a characteristic diagram showing a change in a signal with respect to the food weight of the detection means at the time of thawing, FIG. 5 is a characteristic diagram showing a change of a signal when the thawing is repeated, and FIG. It is. 1 ... food, 2 ... heating room, 3 ... high frequency radiation means, 5
…… Cooling fan, 6… Antenna, 8… Detector, 10
... driving means, 11 ... control means.
Claims (1)
内へ高周波を給電する高周波放射手段と、前記高周波放
射手段を駆動する駆動手段と、前記高周波放射手段、前
記駆動手段を冷却する冷却ファンと、前記駆動手段を制
御する制御手段と、前記高周波を検出するアンテナと、
前記アンテナを介して食品の解凍進行状態を検出する検
波手段とからなり、前記検波手段は、前記冷却ファン付
近に設け冷却される構成とした高周波加熱装置。1. A heating chamber for taking food in and out, a high-frequency radiating means for supplying high frequency to the heating chamber, a driving means for driving the high-frequency radiating means, a high-frequency radiating means, and a cooling fan for cooling the driving means. And control means for controlling the driving means, an antenna for detecting the high frequency,
A high-frequency heating apparatus, comprising: a detecting means for detecting the progress of thawing of food via the antenna, wherein the detecting means is provided near the cooling fan and is cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1223530A JP2615497B2 (en) | 1989-08-30 | 1989-08-30 | High frequency heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1223530A JP2615497B2 (en) | 1989-08-30 | 1989-08-30 | High frequency heating equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0387520A JPH0387520A (en) | 1991-04-12 |
| JP2615497B2 true JP2615497B2 (en) | 1997-05-28 |
Family
ID=16799595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1223530A Expired - Lifetime JP2615497B2 (en) | 1989-08-30 | 1989-08-30 | High frequency heating equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2615497B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011231962A (en) * | 2010-04-27 | 2011-11-17 | Sharp Corp | Heating cooker |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59207595A (en) * | 1983-05-10 | 1984-11-24 | 株式会社日立ホームテック | High frequency heater |
| JPH01167981A (en) * | 1987-12-24 | 1989-07-03 | Matsushita Electric Ind Co Ltd | Heating condition detecting device |
-
1989
- 1989-08-30 JP JP1223530A patent/JP2615497B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0387520A (en) | 1991-04-12 |
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