JPH06103104B2 - Microwave oven with piezoelectric element sensor - Google Patents
Microwave oven with piezoelectric element sensorInfo
- Publication number
- JPH06103104B2 JPH06103104B2 JP60251367A JP25136785A JPH06103104B2 JP H06103104 B2 JPH06103104 B2 JP H06103104B2 JP 60251367 A JP60251367 A JP 60251367A JP 25136785 A JP25136785 A JP 25136785A JP H06103104 B2 JPH06103104 B2 JP H06103104B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- heating
- sensor
- element sensor
- heating chamber
- 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 claims description 29
- 239000002184 metal Substances 0.000 claims description 11
- 230000010287 polarization Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000009835 boiling Methods 0.000 description 3
- 238000010411 cooking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Electric Ovens (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、食品の加熱に応じて食品から発生する気体の
状態を検知して調理を行う電子レンジに関するものであ
る。Description: TECHNICAL FIELD The present invention relates to a microwave oven which detects the state of gas generated from food in response to heating of the food and cooks the food.
従来の技術 従来のこの種の加熱装置、たとえばセンサ付電子レンジ
は第４図に示すように湿度センサ37の抵抗値変化を基準
電圧電源38の電圧を39と分圧するこよにより検知して機
器を制御している。2. Description of the Related Art A conventional heating device of this type, for example, a microwave oven with a sensor, detects a change in the resistance value of a humidity sensor 37 by dividing the voltage of a reference voltage power supply 38 into 39 as shown in FIG. Have control.
（例えば実開昭53−77365号公報） また、湿度センサやガスセンサを用いたものは、本質的
に検知素子の結晶粒界現象を利用するものなので、検知
精度を確保するためや粒界の目づまりを防止するため
に、ヒータにより保温したり、定期的にヒータで汚れを
焼ききることなど、保守面で種々の工夫がなされてい
た。(For example, Japanese Utility Model Laid-Open No. 53-77365) In addition, since a sensor using a humidity sensor or a gas sensor essentially utilizes the crystal grain boundary phenomenon of the detecting element, it is necessary to ensure the detection accuracy or to detect the grain boundary. In order to prevent clogging, various measures have been taken in terms of maintenance, such as keeping the temperature warm with a heater and periodically burning away dirt with the heater.
発明が解決しようとする問題点 このような従来の方式は、抵抗39両端の電圧を制御信号
として用いるので、数多く生産する場合に、構成要素で
ある湿度センサ37の抵抗値、抵抗39の抵抗値、電源38の
電圧のばらつきが制御電圧信号のばらつきに結びつくこ
とになり、管理が困難であった。Problems to be Solved by the Invention Since such a conventional method uses the voltage across the resistor 39 as a control signal, the resistance value of the humidity sensor 37 and the resistance value of the resistor 39, which are constituent elements, are used when a large number are produced. However, variations in the voltage of the power source 38 lead to variations in the control voltage signal, making management difficult.
本発明はかかる点に鑑みてなされたもので簡単な構成で
食品の加熱状態を検出することを目的としている。The present invention has been made in view of the above points, and an object thereof is to detect the heating state of food with a simple configuration.
問題点を解決するための手段 本発明は上記問題点を解決するために、圧電素子センサ
を用い加熱の進捗にともない発生するセンサの分極電圧
をもとに制御器により報知手段や加熱手段を制御するも
のであり特に圧電素子を金属平板に貼付けて圧電素子セ
ンサを構成するものである。Means for Solving the Problems In order to solve the above problems, the present invention uses a piezoelectric element sensor to control an informing means and a heating means by a controller based on the polarization voltage of the sensor generated as the heating progresses. In particular, the piezoelectric element is attached to a metal flat plate to form a piezoelectric element sensor.
作用 本発明によれば、排気部に設けた圧電素子センサは圧電
素子を排気部の一部の開孔に設けられた金属平板に直接
取付ける構成となっているので、排気流の温度変化を容
易に感知し、その温度に応じた分極電圧信号を発生する
ことができる。したがって、この圧電素子センサの信号
により報知手段や加熱手段を容易に制御することができ
る。Effect According to the present invention, since the piezoelectric element sensor provided in the exhaust portion is configured to directly attach the piezoelectric element to the metal flat plate provided in a part of the opening of the exhaust portion, it is easy to change the temperature of the exhaust flow. It is possible to generate a polarization voltage signal according to the temperature of the sensor. Therefore, the notification means and the heating means can be easily controlled by the signal of the piezoelectric element sensor.
実施例 第１図（ａ）（ｂ）は本発明の圧電素子センサの斜視図
と圧電素子センサの取付け状態を示す図である。Example FIGS. 1A and 1B are a perspective view of a piezoelectric element sensor of the present invention and a diagram showing a mounting state of the piezoelectric element sensor.
第１図においてチタン酸鉛などからなる圧電素子１には
電極２、３が両面に施こされ、各電極と端子６、７はリ
ード線４、５で接続されている。又上記電極の一方の面
は金属平板８に接着され、さらに絶縁板９と固着されて
いる。10はセンサ取付孔である。このようなセンサは加
熱室の排気部開孔11を構成する金属板12に取付孔10を介
してとりつけられる。In FIG. 1, electrodes 2 and 3 are provided on both sides of a piezoelectric element 1 made of lead titanate or the like, and each electrode and terminals 6 and 7 are connected by lead wires 4 and 5. Further, one surface of the electrode is adhered to the flat metal plate 8 and further fixed to the insulating plate 9. 10 is a sensor mounting hole. Such a sensor is attached to the metal plate 12 forming the exhaust opening 11 of the heating chamber through the mounting hole 10.
第２図は本発明の加熱装置の一実施例を示すものであ
る。第２図において圧電素子センサ13の出力は、センサ
に対し直線成分が印加されてイオン伝導等による分極特
性の変化が発生しないように、又、センサ電圧出力の直
流成分を阻止するように構成された電圧増巾用のアンプ
14および電圧比較用の比較器15さらには制御器16に接続
されている。FIG. 2 shows an embodiment of the heating device of the present invention. In FIG. 2, the output of the piezoelectric element sensor 13 is configured so that a linear component is not applied to the sensor to cause a change in polarization characteristics due to ionic conduction and the direct current component of the sensor voltage output is blocked. Amplifier for increasing voltage
14 and a comparator 15 for voltage comparison and further to a controller 16.
加熱室17内には食品18が配され、マグネトロン19の冷却
風の１部は、ファン20によりダクト21を介して加熱室17
内に導びかれる。冷却風の１部を実矢線22で、食品から
発生する水分等の気体を点矢線23で示している。冷却風
と食品から発生する水分等を含んだ気体は排気部24を通
って加熱室17から外部に送出される。Food 18 is arranged in the heating chamber 17, and a part of the cooling air of the magnetron 19 is heated by the fan 20 via the duct 21.
Be guided inside. A part of the cooling air is shown by a solid arrow line 22 and a gas such as moisture generated from food is shown by a dotted line 23. The gas containing the cooling air and the water generated from the food and the like is sent from the heating chamber 17 to the outside through the exhaust unit 24.
上記排気部24には圧電センサをとりつけてある。従って
金属平板８に圧電素子１の一方の電極を接着してなる圧
電素子センサ13を排気部開孔11に装着することにより圧
電素子センサ13は、その片面が排気流に接する構成とな
る。本実施例ではファン20を駆動するモータのコア25
に、電源プラグから、電源スイッチ26を介して巻線27と
ともに巻線28が巻いてあり、この巻線28には、整流ブリ
ッジ29、コンデンサ30、抵抗31、定電圧ダイオード32か
らなる定電圧電源部を構成し、モータのコア25に１次巻
線として作用する巻線27と２次巻線として作用する巻線
28をまきつけた構成をとることにより制御回路用のトラ
ンスを不要にしている。また、ブザー33は、増巾された
信号電圧が設定されたスレッシュホールド電圧ΔVTより
も大きくなったときに、制御器16の信号で動作するよう
に構成されている。A piezoelectric sensor is attached to the exhaust unit 24. Therefore, by mounting the piezoelectric element sensor 13 in which one electrode of the piezoelectric element 1 is bonded to the metal flat plate 8 in the exhaust portion opening 11, the piezoelectric element sensor 13 has a structure in which one surface is in contact with the exhaust flow. In this embodiment, the core 25 of the motor that drives the fan 20
In addition, a winding 28 is wound together with the winding 27 from the power plug via the power switch 26. The winding 28 has a constant voltage power supply including a rectifying bridge 29, a capacitor 30, a resistor 31, and a constant voltage diode 32. Part of the motor, and a winding 27 that acts as a primary winding and a winding that acts as a secondary winding on the motor core 25.
By adopting a structure in which 28 is wound, the transformer for the control circuit is unnecessary. Further, the buzzer 33 is configured to operate by the signal of the controller 16 when the increased signal voltage becomes larger than the set threshold voltage ΔV T.
第３図には、第２図構成の電子レンジのセンサ13の出力
電圧特性例を示している。第３図（ａ）は庫内で水が沸
騰したときの出力電圧の時間変化例を示す。第３図
（ｂ）図の（イ）は同じ状態時の出力電圧の周波数スペ
クトラムである。（ｂ）図の（ロ）は電子レンジの電流
投入後で水温が低い場合、（ハ）は電源を投入する前の
出力電圧例である。FIG. 3 shows an example of output voltage characteristics of the sensor 13 of the microwave oven configured as shown in FIG. FIG. 3 (a) shows an example of the change over time in the output voltage when water boils in the refrigerator. FIG. 3B shows the frequency spectrum of the output voltage in the same state. (B) of the figure (b) is an example of the output voltage before the power is turned on when the water temperature is low after the electric current of the microwave oven is turned on.
この第３図（ｂ）の出力特性は50Hzより小さい範囲の周
波数領域の電圧変化成分をみることにより庫内の水の沸
騰状態が検知できることを示すものである。即ち、排気
部24を通る気体は庫内17の食品18が加熱されると、温か
い水蒸気23による高い熱量の排気と冷却風21が混在した
ものとなる。The output characteristic of FIG. 3 (b) shows that the boiling state of water in the refrigerator can be detected by observing the voltage change component in the frequency range smaller than 50 Hz. That is, when the food 18 in the refrigerator 17 is heated, the gas passing through the exhaust unit 24 becomes a mixture of the exhaust gas with a high heat amount due to the warm steam 23 and the cooling air 21.
両者の混在比は時間とともに変化する。したがってマイ
クのケースを通して圧電素子に伝わる熱が変化し、この
熱変化による機械応力が分極電圧を発生するからであ
る。The mixture ratio of both changes with time. Therefore, the heat transmitted to the piezoelectric element through the case of the microphone changes, and the mechanical stress due to this heat change generates a polarization voltage.
このような出力電圧をアンプ14で増巾し、第２図の比較
器15においてスレッシュホールド電圧ΔVTと信号電圧を
比較することにより、信号電圧がΔVTより大きくなった
時に制御器16でブザー報知するようにすれば、調理物が
沸騰点に達した時点を知ることができる。又制御器で電
源電圧を開成することで加熱を停止する構成も可能であ
る。さらに増巾器の増巾度をあげることや、圧電素子セ
ンサの取付け方を工夫して、検知感度をあげれば沸騰点
のみならず水蒸気圧の急増する水温60℃位からの検知も
可能であり、この場合スレッシュホールド電圧を手動可
変設定可能にすれば、調理出来上がりの調整も可能にな
るほど多くの効果が期せるものである。By amplifying such output voltage with the amplifier 14 and comparing the threshold voltage ΔV T with the signal voltage in the comparator 15 in FIG. 2, the controller 16 buzzers when the signal voltage becomes larger than ΔV T. If the notification is given, it is possible to know the time when the cooking product reaches the boiling point. It is also possible to adopt a configuration in which heating is stopped by opening the power supply voltage with the controller. Furthermore, by increasing the amplification of the amplifier and devising the mounting method of the piezoelectric element sensor to increase the detection sensitivity, it is possible to detect not only at the boiling point but also at a water temperature of about 60 ° C where the water vapor pressure rapidly increases. In this case, if the threshold voltage can be manually set, many effects can be expected so that the cooking completion can be adjusted.
発明の効果 以上述べてきたように本発明によれば、きわめて簡易な
構成で、食品の加熱状態検知機能つきの電子レンジが実
現できる。EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to realize a microwave oven with a function of detecting the heating state of food with an extremely simple structure.
すなわち、本発明ではセンサとして圧電素子センサを排
気部に設け、しかもその構成が金属平板に圧電素子を接
着する構成としたもので、排気流の温度変化を容易に感
知し、これにより調理の出来上りを制御することができ
る。That is, in the present invention, a piezoelectric element sensor is provided as a sensor in the exhaust portion, and the configuration is such that the piezoelectric element is adhered to a metal flat plate, and the temperature change of the exhaust gas flow can be easily sensed to complete cooking. Can be controlled.
また、圧電素子センサの感度はセンサの熱抵抗、熱容量
と増巾器の入力抵抗、容量値により決定されるものであ
る。金属平板に圧電素子を貼付けた本発明構成は、金属
平板の大きさや厚みを変えることで、目的に応じて感度
設定がしやすい。Further, the sensitivity of the piezoelectric element sensor is determined by the thermal resistance and heat capacity of the sensor and the input resistance and capacity value of the amplifier. In the configuration of the present invention in which the piezoelectric element is attached to the metal flat plate, the sensitivity can be easily set according to the purpose by changing the size and thickness of the metal flat plate.
また、保温したり定期的にヒータで汚れを焼ききること
など、不要である。従って、保温用の電力や焼き切り用
の電力が不要で省電力型である。Further, it is not necessary to keep the temperature warm or to regularly burn off the dirt with a heater. Therefore, it is a power-saving type that does not require power for heat retention or power for burning out.
また、保温用ヒータ電力の精度を保つための制御用パー
ツやヒータ電力用の特別のトランスが不要であり安価で
ある。さらに、電子レンジ内の電磁騒音や冷却ファンの
風切り音による雑音レベルに対して、信号が大きいので
安定した制御ができる。Further, it is inexpensive because it does not require a control part for maintaining the accuracy of the heater power for heat retention or a special transformer for heater power. Further, since the signal is large with respect to the noise level due to the electromagnetic noise in the microwave oven and the wind noise of the cooling fan, stable control can be performed.
第１図（ａ）（ｂ）は本発明の一実施例の圧電素子セン
サ付き電子レンジの圧電素子センサの斜視図およびセン
サ取付けの断面図、第２図は同圧電素子センサを電子レ
ンジに設けた構成図、第３図（ａ）（ｂ）はそれぞれ同
圧電素子センサの出力特性図、第４図は従来例のブロッ
ク図である。 １……圧電素子、２、３……電極、８……金属平板、９
……絶縁板、10……センサ取付孔、13……圧電素子セン
サ、16……制御器、17……加熱室、18……被加熱物（食
品）、19……加熱手段（マグネトロン）。1 (a) and 1 (b) are perspective views of a piezoelectric element sensor of a microwave oven with a piezoelectric element sensor according to an embodiment of the present invention and a sectional view of sensor attachment, and FIG. 2 shows the piezoelectric element sensor provided in a microwave oven. 3A and 3B are output characteristic diagrams of the piezoelectric element sensor, and FIG. 4 is a block diagram of a conventional example. 1 ... Piezoelectric element, 2, 3 ... Electrode, 8 ... Metal flat plate, 9
...... Insulating plate, 10 ...... Sensor mounting hole, 13 ...... Piezoelectric element sensor, 16 …… Controller, 17 …… Heating chamber, 18 …… Heating object (food), 19 …… Heating means (magnetron).
Claims (2)
内の被加熱物を加熱するマイクロ波発生手段と、前記被
加熱物の加熱状態を報知する報知手段と、この報知手段
の動作を制御する制御器と、上記加熱室の内部の気体を
加熱室外に排気する排気部とを備え、この排気部には、
その片面を排気流に接するように配設した圧電素子セン
サを設け、この圧電素子センサの分極電圧信号をもとに
前記制御器により、前記報知手段を制御するものにおい
て、上記圧電素子センサは圧電素子を金属平板に固着し
て構成したことを特徴とする圧電素子センサ付き電子レ
ンジ。1. A heating chamber for containing an object to be heated, a microwave generator for heating the object to be heated in the heating chamber, an informing unit for informing a heating state of the object to be heated, and an operation of the informing unit. And a gas exhaust unit for exhausting the gas inside the heating chamber to the outside of the heating chamber.
A piezoelectric element sensor is provided, one surface of which is in contact with the exhaust flow, and the controller controls the notification means based on a polarization voltage signal of the piezoelectric element sensor. A microwave oven with a piezoelectric element sensor, characterized in that the element is fixed to a flat metal plate.
内の被加熱物を加熱する加熱手段と、この加熱手段の動
作を制御する制御器と、上記加熱室の内部の気体を加熱
室外に排気する排気部とを備え、この排気部には、その
片面を排気流に接するように配設した圧電素子センサを
設け、この圧電素子センサの分極電圧信号をもとに前記
制御器により、前記加熱手段を制御するものにおいて、
上記圧電素子センサは圧電素子を金属平板に固着して構
成したことを特徴とする圧電素子センサ付き電子レン
ジ。2. A heating chamber for containing an object to be heated, a heating means for heating the object to be heated in the heating chamber, a controller for controlling the operation of the heating means, and a gas for heating the inside of the heating chamber. An exhaust unit for exhausting to the outside of the room is provided, and this exhaust unit is provided with a piezoelectric element sensor arranged so that one surface thereof is in contact with the exhaust flow. , Controlling the heating means,
A microwave oven with a piezoelectric element sensor, wherein the piezoelectric element sensor is configured by fixing a piezoelectric element to a metal flat plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60251367A JPH06103104B2 (en) | 1985-11-08 | 1985-11-08 | Microwave oven with piezoelectric element sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60251367A JPH06103104B2 (en) | 1985-11-08 | 1985-11-08 | Microwave oven with piezoelectric element sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62112929A JPS62112929A (en) | 1987-05-23 |
| JPH06103104B2 true JPH06103104B2 (en) | 1994-12-14 |
Family
ID=17221771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60251367A Expired - Lifetime JPH06103104B2 (en) | 1985-11-08 | 1985-11-08 | Microwave oven with piezoelectric element sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06103104B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2538016B2 (en) * | 1988-12-29 | 1996-09-25 | 松下電器産業株式会社 | Heating cooker |
| JP2578963B2 (en) * | 1989-01-06 | 1997-02-05 | 松下電器産業株式会社 | Pyroelectric sensor and thermal device with pyroelectric sensor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56157635U (en) * | 1980-04-24 | 1981-11-25 | ||
| JPS58126602U (en) * | 1982-02-23 | 1983-08-27 | シャープ株式会社 | cooking equipment |
-
1985
- 1985-11-08 JP JP60251367A patent/JPH06103104B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62112929A (en) | 1987-05-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |