JP2563602B2 - High frequency heating equipment - Google Patents
High frequency heating equipmentInfo
- Publication number
- JP2563602B2 JP2563602B2 JP1232516A JP23251689A JP2563602B2 JP 2563602 B2 JP2563602 B2 JP 2563602B2 JP 1232516 A JP1232516 A JP 1232516A JP 23251689 A JP23251689 A JP 23251689A JP 2563602 B2 JP2563602 B2 JP 2563602B2
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- heating chamber
- food
- detection circuit
- detecting
- 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
- 238000010438 heat treatment Methods 0.000 title claims description 45
- 238000001514 detection method Methods 0.000 claims description 31
- 235000013305 food Nutrition 0.000 claims description 29
- 238000010257 thawing Methods 0.000 description 14
- 238000009835 boiling Methods 0.000 description 10
- 238000010411 cooking Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 6
- 230000005684 electric field Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000003187 abdominal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Electric Ovens (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Constitution Of High-Frequency Heating (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、食品の解凍或いは沸騰を自動的に検知する
高周波加熱装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device that automatically detects thawing or boiling of food.
従来の技術 従来の高周波加熱装置の、解凍および沸騰の検知手段
を説明する。2. Description of the Related Art Defrosting and boiling detection means of a conventional high-frequency heating device will be described.
従来の解凍検知手段として、タイムオートと重量セン
サについて述べる。As a conventional defrosting detecting means, a time auto and a weight sensor will be described.
タイムオートは、一般的ないくつかの食品に応じて目
安となる調理時間を設定する手段であり、重量センサ
は、食品の種類を設定すると自動的にその重量を検出
し、それに応じた調理を行なう手段である。Time Auto is a means to set a standard cooking time according to some common foods, and a weight sensor automatically detects the weight of the food when it is set, and prepares the food accordingly. It is a means to do.
また、従来の沸騰検知手段として、絶対湿度センサと
圧電素子センサについて述べる。Further, an absolute humidity sensor and a piezoelectric element sensor will be described as conventional boiling detection means.
絶対湿度センサは、食品中の水分が沸騰して湿度が減
少から増大へ急激に変化する点を、抵抗値変化として取
出すもの（例えば特開昭53−77365号公報）であり、圧
電素子センサは、沸騰蒸気により加えられた熱変化によ
る分極電流を、電圧値として取出すもの（例えば特開昭
62−37624号公報）である。The absolute humidity sensor takes out a point where the water content in the food boils and the humidity suddenly changes from a decrease to an increase (for example, Japanese Patent Laid-Open No. 53-77365), and the piezoelectric element sensor is , Which takes out the polarization current due to the heat change applied by boiling steam as a voltage value
62-37624).
発明が解決しようとする課題 解凍検知手段として、タイムオートを用いると、食品
の重さのばらつきがや形状や初期状態に関わらず一定時
間で加熱を終了するので、加熱不足や加熱のしすぎ等が
起こりやすく、一定の解凍仕上がり状態にならないとい
う課題があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention When time auto is used as a thawing detection means, the heating is finished in a certain time regardless of the variation in the weight of the food or the shape and the initial state. However, there was a problem that the thawing process would not occur to a certain extent.
また解凍検知手段として、重量センサを用いると、タ
イムオートより解凍仕上がり状態は良いが、その機構上
コストが高いという課題を有していた。Further, when a weight sensor is used as the thawing detecting means, the finished state of thawing is better than that of the time auto, but there is a problem that the mechanism is high in cost.
一方沸騰検知手段として、絶対湿度センサを用いる
と、調理中に食品中のガスや油などがセンサに付着して
検出感度が落ちてくるため、一回の調理毎にリフレッシ
ュ加熱処理用のヒータで付着物を焼切らねばならず、余
分な電力やコストが発生する課題があった。On the other hand, if an absolute humidity sensor is used as boiling detection means, gas or oil in food adheres to the sensor during cooking and the detection sensitivity decreases, so a heater for refresh heat treatment is required for each cooking. There is a problem that extraneous power and cost are generated because the adhered matter must be burnt out.
また沸騰検知手段として、圧電素子センサを用いる
と、取付構成に工夫をしないと圧電素子自体の温度が上
昇し、その温度特性により出力が低下し、加熱終了時間
が伸びてくるという欠点があった。Further, if a piezoelectric element sensor is used as the boiling detection means, the temperature of the piezoelectric element itself rises unless the mounting structure is devised, and the output decreases due to the temperature characteristics, and the heating end time extends. .
そこで本発明は、食品の解凍或いは沸騰を感度良く検
知する手段を提供する事を第一の目的とする。Therefore, a first object of the present invention is to provide a means for detecting the thawing or boiling of food with high sensitivity.
また本発明は、アンテナ自身の構成を簡単にして、取
付け自由度を増し、汎用性のある検知手段を提供する事
を第二の目的とする。A second object of the present invention is to provide a versatile detecting means which simplifies the structure of the antenna itself, increases the degree of freedom of attachment.
さらに本発明は、アンテナの保護により、汚れの影響
を防ぎ、アンテナのインピーダンスを一定に保ち高信頼
度の検知手段を提供する事を第三の目的とする。A third object of the present invention is to provide a highly reliable detecting means for protecting the antenna from the influence of dirt and keeping the impedance of the antenna constant.
課題を解決するための手段 上記第一の目的を達成するために本発明の高周波加熱
装置は、食品を格納する加熱室と、前記食品に電磁波を
放射して調理する電波放射部と、前記加熱室内の電波を
検出するアンテナと、前記アンテナの検出した電波を検
波する検波回路と、前記検波回路の出力に応じて機器動
作を制御する制御器を有し、前記アンテナは前記加熱室
内の定在波の腹の位置に取付ける構成としている。Means for Solving the Problems In order to achieve the first object, a high-frequency heating device of the present invention is a heating chamber for storing food, a radio wave radiating section for radiating electromagnetic waves to the food for cooking, and the heating. An antenna for detecting radio waves in the room, a detection circuit for detecting the radio waves detected by the antenna, and a controller for controlling device operation according to the output of the detection circuit are provided, and the antenna is fixed in the heating chamber. It is configured to be installed at the antinode of the wave.
上記第二の目的を達成するために本発明の高周波加熱
装置は、食品を格納する加熱室と、前記食品に電磁波を
放射して調理する電波放射部と、前記加熱室内の電波を
検出するアンテナと、前記アンテナの検出した電波を検
波する検波回路と、前記検波回路の出力に応じて機器動
作を制御する制御器を有し、前記アンテナはダイポール
タイプとしている。In order to achieve the second object, the high-frequency heating device of the present invention is a heating chamber that stores food, a radio wave radiation unit that radiates electromagnetic waves to the food for cooking, and an antenna that detects radio waves in the heating chamber. And a detection circuit for detecting the radio wave detected by the antenna, and a controller for controlling the device operation according to the output of the detection circuit. The antenna is a dipole type.
上記第三の目的を達成するために本発明の高周波加熱
装置は、食品を格納する加熱室と、前記食品に電磁波を
放射して調理する電波放射部と、前記加熱室内の電波を
検出するアンテナと、前記アンテナの検出した電波を検
波する検波回路と、前記検波回路の出力に応じた機器動
作を制御する制御器を有し、前記アンテナを防護するカ
バーを設けた構成としている。In order to achieve the third object, a high-frequency heating device of the present invention is a heating chamber that stores food, a radio wave radiation unit that radiates electromagnetic waves to the food for cooking, and an antenna that detects radio waves in the heating chamber. And a detection circuit for detecting the radio wave detected by the antenna, a controller for controlling device operation according to the output of the detection circuit, and a cover for protecting the antenna.
作用 上記第一の構成により本発明の高周波加熱装置は、ア
ンテナを加熱室内の定在波の腹の位置に取付けるので、
負荷状態の変化による反射電力の変動に対し、検波出力
の感度が良い作用を有する。Action Since the high-frequency heating device of the present invention having the above-mentioned first configuration mounts the antenna at the position of the antinode of the standing wave in the heating chamber,
The detection output has a high sensitivity to the fluctuation of the reflected power due to the change of the load state.
上記第二の構成により本発明の高周波加熱装置は、ア
ンテナをダイポールタイプとするので、オーブンへの取
付けが容易となる作用を有する。With the above-described second configuration, the high-frequency heating apparatus of the present invention uses the dipole type antenna, which has the effect of facilitating attachment to the oven.
上記第三の構成により本発明の高周波加熱装置は、ア
ンテナ防護カバーを設けるので、汚れにくく、汚れによ
るアンテナ自身のインピーダンスの変動が無い作用を有
する。Since the high-frequency heating apparatus of the present invention having the above-mentioned third configuration is provided with the antenna protection cover, it has the function of being less likely to be contaminated and preventing the impedance of the antenna itself from varying due to contamination.
実施例 以下、本発明の一実施例を添付図面に基づいて説明す
る。Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図は、本発明の一実施例の高周波加熱装置の本来
主要部の構成図である。FIG. 1 is a block diagram of the essential part of the high-frequency heating apparatus according to one embodiment of the present invention.
電波放射部１（この場合はマグネトロン）から放射さ
れる電波は、加熱室２内の食品３にパワーを与えようと
するが、食品３の状態によってパワーの入り方が変化す
る。アンテナ４（この場合は径が1mm以下で長さが5mm前
後のダイポール型で、加熱室２の側板に取付けてある）
は、加熱室２内の電波の一部を検知するので、食品３の
状態に応じたパワーの変化を読みとることが出来る。ア
ンテナ４で検知した信号は、検波回路５を通り、制御器
６に入る。制御器６は、入射信号に応じて食品の解凍や
沸騰などの調理仕上がりを判定し、マグネトロン１やそ
の他の機器動作を制御する。The radio waves emitted from the radio wave emission unit 1 (magnetron in this case) try to give power to the food 3 in the heating chamber 2, but the way of entering the power changes depending on the state of the food 3. Antenna 4 (in this case, a dipole type with a diameter of 1 mm or less and a length of about 5 mm, attached to the side plate of the heating chamber 2)
Detects a part of the radio wave in the heating chamber 2, so that the change in power according to the state of the food 3 can be read. The signal detected by the antenna 4 passes through the detection circuit 5 and enters the controller 6. The controller 6 determines the cooking finish such as thawing or boiling of food according to the incident signal, and controls the operation of the magnetron 1 and other devices.
解凍検知の仕組みについて説明する。冷凍食品は電波
を吸収しにくいため反射電力が大きくなり、アンテナ４
による検波出力は大であるが、解凍が進むと食品は電波
を吸収しやすくなるので反射電力が小さくなり検波出力
も低下する。この点で解凍を検知出来る。The mechanism of defrosting detection is explained. Since frozen food does not easily absorb radio waves, the reflected power increases and the antenna 4
Although the detection output due to is large, as the thawing progresses, food easily absorbs the radio waves, so the reflected power becomes smaller and the detection output also decreases. Defrosting can be detected at this point.
この時、アンテナ４の取付位置として、電界の集中す
るところを選ぶこととしている。電界の集中するところ
とは、加熱室２内の電波によって起こる定在波の腹の部
分と考えると良い。加熱室２内の側面での定在波７の立
ち方を図の様な簡単なモデルで考えた時に、腹の部分ア
と節の部分イなどが存在する。At this time, the position where the electric field is concentrated is selected as the mounting position of the antenna 4. The place where the electric field is concentrated may be considered to be the antinode portion of the standing wave generated by the electric wave in the heating chamber 2. When the standing wave 7 on the side surface in the heating chamber 2 is considered with a simple model as shown in the figure, there are an abdominal part a and a knot part a.
このアの位置にアンテナを取付けるわけである。（一
般にアの位置では、電界の集中による温度上昇が最も顕
著である事を付け加えておく。）このアの位置にアンテ
ナ４を取り付けると、調理の進行と共に変化する食品３
の状態によって定在波７の振巾も（冷凍状態で大、解凍
後小、沸とう後大というように）変化するわけである
が、この振巾の変化を最も感度良くアンテナ４が検知す
ることになる。このため、調理用センサとしてのアンテ
ナ４の感度の点から考えて、取付け位置はアの位置が最
も良いと言える。The antenna is installed at this position. (Generally, it is added that the temperature rise due to the concentration of the electric field is most remarkable at the position of A.) When the antenna 4 is attached at the position of A, the food 3 which changes with the progress of cooking 3
The amplitude of the standing wave 7 also changes (such as large in the frozen state, small after thawing, and large after boiling) depending on the state of, and the antenna 4 detects this change in the amplitude with the highest sensitivity. It will be. Therefore, from the viewpoint of the sensitivity of the antenna 4 as the cooking sensor, it can be said that the mounting position is the best.
第２図は、本発明の他の実施例の高周波加熱装置にお
ける、主要部の断面図である。FIG. 2 is a sectional view of a main part in a high frequency heating apparatus according to another embodiment of the present invention.
加熱室２内にアンテナとしてダイポールタイプ（いわ
ゆる針型）のアンテナ４を装着しており、アンテナ４を
加熱室２の壁面（グランド電位）から絶縁するために、
絶縁性のあるアンテナ取付け治具８により固定されてい
る。A dipole type (so-called needle type) antenna 4 is mounted as an antenna in the heating chamber 2, and in order to insulate the antenna 4 from the wall surface (ground potential) of the heating chamber 2,
It is fixed by an antenna mounting jig 8 having an insulating property.
第３図は、本発明のさらに他の一実施例の高周波加熱
装置における、主要部の断面図である。第２図で述べた
のと同様に、加熱室２内の壁面にアンテナ取付治具８に
よりアンテナ４を固定している。ここでアンテナ防護用
のカバー９により、電波は通すが食品から発生する油分
や煙などのような汚れの原因となる物を遮断している。FIG. 3 is a sectional view of a main part in a high frequency heating apparatus according to still another embodiment of the present invention. As described in FIG. 2, the antenna 4 is fixed to the wall surface in the heating chamber 2 by the antenna mounting jig 8. Here, a cover 9 for protecting the antenna allows electromagnetic waves to pass through, but shuts off substances that cause dirt such as oil and smoke generated from food.
第４図は、アンテナ４で取込んだ電波を検波する検波
回路５の回路図である。マッチング用の抵抗10（この場
合50Ω）、検波ダイオード11（例えばショットキーバリ
アダイオード）、抵抗12、13、バイパスコンデンサ14に
より、電波は電圧V2として検出される。FIG. 4 is a circuit diagram of the detection circuit 5 that detects the radio wave captured by the antenna 4. Radio waves are detected as a voltage V 2 by a matching resistor 10 (50Ω in this case), a detection diode 11 (for example, a Schottky barrier diode), resistors 12 and 13, and a bypass capacitor 14.
第５図は、検波回路５をマイクロストリップラインで
構成した図である。FIG. 5 is a diagram in which the detection circuit 5 is configured by a microstrip line.
ある誘電率εｒを有する誘電体基板15上に銅箔のパタ
ーン16、17、18、19をエッチングしている。16の銅箔の
部分は特性インピーダンス50Ωであり、17の部分はアー
スである。マイクロストリップライン上で検波回路５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
帯に合わせて最適に設計するのが容易であり、エッチン
グで行なっているので検波精度が向上する。Copper foil patterns 16, 17, 18, and 19 are etched on a dielectric substrate 15 having a certain dielectric constant ε r . The copper foil part of 16 has a characteristic impedance of 50Ω, and the part of 17 is ground. By configuring the detection circuit 5 on the microstrip line, it is easy to optimally design the length of the line according to the frequency band to be detected, and the detection accuracy is improved because etching is performed.
第６図は本発明の制御器６の一実施例のブロック図で
ある。検波回路５の出力をアンプ20で増巾し、マイコン
21でデジタルフィルタリングすることで、解凍や沸騰を
判別し、電波放射部１への制御信号22を出す仕組みとな
っている。FIG. 6 is a block diagram of an embodiment of the controller 6 of the present invention. The output of the detection circuit 5 is amplified by the amplifier 20,
Digital filtering is performed at 21 to determine thawing or boiling and issue a control signal 22 to the radio wave radiating unit 1.
但し、前述の“電界の集中するところ”という表現に
ついて以下の様に定義する。高周波加熱装置の加熱室壁
面内側に、たとえばサーモペイントを前面に塗布した高
さ30m程度の厚紙を垂直に取付け、無負荷動作をさせ
る。この時にサーモペイントの色変化が大きい所と小さ
い所が混在するが、色変化が相対的に大きい所を“電界
の集中するところ”と定義する。However, the expression "where the electric field is concentrated" is defined as follows. Inside the wall surface of the heating chamber of the high-frequency heating device, for example, a cardboard with a height of about 30 m, which is coated with thermopaint on the front surface, is vertically installed to perform no-load operation. At this time, a portion where the color change of the thermo-paint is large and a portion where the color change is small are mixed, and the place where the color change is relatively large is defined as "the place where the electric field is concentrated".
発明の効果 以上の様に本発明は、アンテナを加熱室内の定在波の
腹の位置に取付けるので、食品が冷凍状態から解凍を終
える時やあたため終了の際の反射電力の変動を感度良く
検知出来るため、オート調理としては最も適切な仕上が
りを提供できる。As described above, according to the present invention, since the antenna is attached to the position of the antinode of the standing wave in the heating chamber, the fluctuation of the reflected power when the food is thawed from the frozen state or when it is warmed is detected with high sensitivity. As a result, it can provide the most suitable finish for automatic cooking.
またさらに本発明は、アンテナをダイボールタイプと
するので、取付け場所の制約が少なく好きな所に取付け
られ、構成も最も容易である。Further, according to the present invention, since the antenna is a die ball type, there are few restrictions on the mounting place and the antenna can be mounted at a desired place, and the structure is the easiest.
またさらに本発明は、アンテナを保護するカバーを設
けるので、油やガス等による汚れの影響を防ぎ、アンテ
ナのインピーダンスの変動を防ぐ事が出来るので、セン
サとして信頼性が極めて高くなる。Further, according to the present invention, since the cover for protecting the antenna is provided, it is possible to prevent the influence of dirt such as oil and gas and to prevent the impedance of the antenna from fluctuating, so that the reliability of the sensor becomes extremely high.
第１図は本発明の一実施例の高周波加熱装置の主要部の
構成図、第２図、第３図は同装置の主要部の断面図、第
４図は同装置の検波回路の回路図、第５図は同装置の検
波手段のマイクロストリップライン上の構成図、第６図
は同装置の制御器のブロック図である。 １……電波放射部、２……加熱室、３……食品、４……
アンテナ、５……検波回路、６……制御器、８……アン
テナ取付け治具、９……カバー。FIG. 1 is a configuration diagram of a main part of a high-frequency heating device according to an embodiment of the present invention, FIGS. 2 and 3 are sectional views of the main part of the device, and FIG. 4 is a circuit diagram of a detection circuit of the device. 5 is a block diagram of a detecting means of the apparatus on a microstrip line, and FIG. 6 is a block diagram of a controller of the apparatus. 1 ... Radio wave radiating part, 2 ... Heating room, 3 ... Food, 4 ...
Antenna, 5 ... Detection circuit, 6 ... Controller, 8 ... Antenna mounting jig, 9 ... Cover.
Claims (3)
波を放射して調整する電波放射部と、前記加熱室内の電
波を検出するアンテナと、前記アンテナの検出した電波
を検波する検波回路と、前記検波回路の出力に応じて機
器動作を制御する制御器を有し、前記アンテナは前記加
熱室内の定在波の腹の位置に取付ける構成とした高周波
加熱装置。1. A heating chamber for storing food, a radio wave radiating unit for radiating electromagnetic waves to the food for adjustment, an antenna for detecting radio waves in the heating chamber, and a detection circuit for detecting the radio waves detected by the antenna. And a controller for controlling the device operation according to the output of the detection circuit, and the antenna is attached to the antinode of the standing wave in the heating chamber.
波を放射して調整する電波放射部と、前記加熱室内の電
波を検出するアンテナと、前記アンテナの検出した電波
を検波する検波回路と、前記検波回路の出力に応じて機
器動作を制御する制御器を有し、前記アンテナはダイポ
ールタイプとした高周波加熱装置。2. A heating chamber for storing foods, a radio wave radiating unit for radiating electromagnetic waves to the foods for adjustment, an antenna for detecting radio waves in the heating chamber, and a detection circuit for detecting the radio waves detected by the antennas. And a controller for controlling device operation according to the output of the detection circuit, wherein the antenna is a dipole type high frequency heating device.
波を放射して調整する電波放射部と、前記加熱室内の電
波を検出するアンテナと、前記アンテナの検出した電波
を検波する検波回路と、前記検波回路の出力に応じて機
器動作を制御する制御器を有し、前記アンテナを防護す
るカバーを設けた高周波加熱装置。3. A heating chamber for storing food, a radio wave radiating unit for radiating and adjusting electromagnetic waves to the food, an antenna for detecting radio waves in the heating chamber, and a detection circuit for detecting the radio waves detected by the antenna. And a high-frequency heating apparatus having a controller for controlling device operation according to the output of the detection circuit and provided with a cover for protecting the antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1232516A JP2563602B2 (en) | 1989-09-07 | 1989-09-07 | High frequency heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1232516A JP2563602B2 (en) | 1989-09-07 | 1989-09-07 | High frequency heating equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0395313A JPH0395313A (en) | 1991-04-19 |
| JP2563602B2 true JP2563602B2 (en) | 1996-12-11 |
Family
ID=16940555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1232516A Expired - Lifetime JP2563602B2 (en) | 1989-09-07 | 1989-09-07 | High frequency heating equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2563602B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60118891U (en) * | 1984-01-21 | 1985-08-10 | 株式会社日立ホームテック | High frequency heating device |
-
1989
- 1989-09-07 JP JP1232516A patent/JP2563602B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0395313A (en) | 1991-04-19 |
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