JPH0523334B2 - - Google Patents
Info
- Publication number
- JPH0523334B2 JPH0523334B2 JP17362685A JP17362685A JPH0523334B2 JP H0523334 B2 JPH0523334 B2 JP H0523334B2 JP 17362685 A JP17362685 A JP 17362685A JP 17362685 A JP17362685 A JP 17362685A JP H0523334 B2 JPH0523334 B2 JP H0523334B2
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- voltage
- piezoelectric element
- heating chamber
- microwave oven
- 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 19
- 235000013305 food Nutrition 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (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、制御を行う圧電素子セ
ンサ付き電子レンジに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a microwave oven equipped with a piezoelectric element sensor that detects and controls the state of gas generated from food as the food is heated.
従来の技術
従来のセンサ付電子レンジは、第10図に示す
ように、湿度センサ41の抵抗値変化を基準電圧
電源42の電圧を抵抗43と分圧することにより
検知して機器を制御している。(例えば特開昭53
−77365号公報)
発明が解決しようする問題点
このような従来の方式は、抵抗43両端の電圧
を制御信号として用いているので、数多く生産す
る場合に、各構成要素湿度センサ41の抵抗、抵
抗43、電源42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
であつた。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手段
を提供することを目的としている。Prior Art As shown in FIG. 10, a conventional microwave oven with a sensor detects a change in the resistance value of a humidity sensor 41 by dividing the voltage of a reference voltage power source 42 with a resistor 43 to control the device. . (For example, Japanese Patent Publication No. 53
-77365 Publication) Problems to be Solved by the Invention This conventional system uses the voltage across the resistor 43 as a control signal. 43. Variations in the voltage of the power supply 42 lead to variations in the control voltage signal, making management difficult. The present invention has been made in view of this problem, and an object of the present invention is to provide a means for detecting 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、センサ
として従来例とは別の圧電素子センサを利用しさ
らに上記センサを加熱室壁に絶縁体を介して取付
けるものである。Means for Solving the Problems In order to solve the above problems, the present invention utilizes a piezoelectric element sensor different from the conventional sensor as a sensor and further attaches the sensor to the wall of the heating chamber via an insulator. be.
作 用
本発明によれば、新規のセンサを用いているの
で原理的に従来例の基準電圧や分圧用抵抗に相当
するものが不要であり、簡単な構成で制御できる
ものである。Effects According to the present invention, since a new sensor is used, in principle, there is no need for anything equivalent to the reference voltage or voltage dividing resistor of the conventional example, and control can be performed with a simple configuration.
実施例
第1図は本発明の圧電素子センサ付き電子レン
ジのセンサ取付部を示すものである。第1図にお
いて圧電素子センサ1はその端子2が印刷基板等
の電気的、熱的絶縁材料からなるセンサ取付板3
に固定され、さらに加熱室の壁4にビス5を介し
て取付けられている。Embodiment FIG. 1 shows a sensor mounting part of a microwave oven equipped with a piezoelectric element sensor according to the present invention. In FIG. 1, a piezoelectric element sensor 1 has terminals 2 on a sensor mounting plate 3 made of electrically and thermally insulating material such as a printed circuit board.
It is further attached to the wall 4 of the heating chamber via screws 5.
第2図は本発明の圧電素子センサ付き電子レン
ジ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1の出力は、センサに対し直流成
分が印加されないように、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6(以降直流阻止アンプと呼ぶ)および
電圧比較用の比較器7さらには制御器8に接続さ
れている。 FIG. 2 shows an embodiment of a microwave oven equipped with a piezoelectric sensor according to the present invention. In FIG. 2, the output of the piezoelectric sensor 1 is connected to a voltage amplification amplifier 6 (hereinafter referred to as DC blocking) configured to prevent DC components from being applied to the sensor and to block the DC components of the sensor voltage output. (referred to as an amplifier), a comparator 7 for voltage comparison, and a controller 8.
加熱室10内には食品11が配され、マグネト
ロン9の冷却風の1部は、フアン12によりダク
ト13を介して加熱室10内に導びかれる。冷却
風の1部を実矢線14で、食品から発生する水分
等の気体を点矢線15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16
を通つて加熱室10から外部に送出される。 A food product 11 is placed in the heating chamber 10 , and a portion of the cooling air from the magnetron 9 is guided into the heating chamber 10 through a duct 13 by a fan 12 . A portion of the cooling air is indicated by a solid arrow line 14, and a gas such as moisture generated from the food is indicated by a dotted arrow line 15. The cooling air and the gas containing moisture generated from the food are removed from the exhaust section 16.
It is sent out from the heating chamber 10 through.
上記排気部16には第1図に示した方法で圧電
センサをとりつけてある。本実施例ではフアン1
2を駆動するモータのコア17に、電源プラグか
ら、電源スイツチ19を介して巻線20とともに
巻線21が巻いてあり、この巻線21には、整流
ブリツジ22、コンデンサ23、抵抗24、定電
圧ダイオード25からなる定電圧電源部を構成
し、制御回路用のトランスを不要にしている。ま
た、ブザー26は、増巾された信号電圧が設定さ
れたスレツシユホールド電圧ΔVTよりも大きくな
つたときに、制御器8の信号で動作するように構
成されている。第3図〜第5図を用いて実測構成
例を示す。第3図は実験に用いた電子レンジの構
成である。電波出力500Wで、マグネトロン9の
電波は導波部を介して加熱室10に供され、食品
皿28がモータ29で回転する構成をとるもので
ある。第4図は排気部16に圧電素子センサ1を
取付けた状態を示す。第5図は圧電素子センサと
して実験で用いた防滴型超音波マイク構成を示す
ものであり、マイクは圧電素子30、シリコンゴ
ムスペーサ31、端子32、振動部33、ケース
34、リード線35、内リンク36、端子板3
7、シリコンゴム38からなつている。 A piezoelectric sensor is attached to the exhaust section 16 in the manner shown in FIG. In this example, fan 1
A winding 21 is wound around the core 17 of the motor that drives the motor 2 along with the winding 20 from the power plug via the power switch 19. The voltage diode 25 constitutes a constant voltage power supply section, eliminating the need for a transformer for the control circuit. Further, the buzzer 26 is configured to operate according to a signal from the controller 8 when the amplified signal voltage becomes larger than a set threshold voltage ΔV T . Examples of actually measured configurations are shown using FIGS. 3 to 5. Figure 3 shows the configuration of the microwave oven used in the experiment. With a radio wave output of 500 W, the radio waves from the magnetron 9 are supplied to the heating chamber 10 via a waveguide, and the food plate 28 is rotated by a motor 29. FIG. 4 shows a state in which the piezoelectric element sensor 1 is attached to the exhaust section 16. FIG. 5 shows the configuration of a drip-proof ultrasonic microphone used in the experiment as a piezoelectric element sensor. Inner link 36, terminal board 3
7. Made of silicone rubber 38.
(National Technical Report P504〜P514
vol29 No3 JAN 1983)
第6図には上記、圧電素子センサの信号と雑音
についてのデータ例を示す。aは庫内10の水が
沸騰したときの信号波形例を示している。bに
は、この波形をスペクトラム分析した結果例を示
す。40KHz用の超音波マイクに、温かい水蒸気を
含む風があたることにより、0〜50Hz帯で大きい
信号が出ていることがわかる。イとロの差は約
30dB、信号レベルは数mVの電圧である。イは
庫内の水が沸騰した場合、ロは沸騰前の場合、ハ
は電子レンジに通電されてない場合である。 (National Technical Report P504~P514
vol29 No3 JAN 1983) Figure 6 shows an example of data regarding the signal and noise of the piezoelectric sensor mentioned above. a shows an example of a signal waveform when the water in the refrigerator 10 boils. Figure b shows an example of the results of spectrum analysis of this waveform. It can be seen that when the 40KHz ultrasonic microphone is exposed to wind containing warm water vapor, a large signal is emitted in the 0-50Hz band. The difference between A and B is about
30dB, signal level is several mV voltage. A is when the water in the refrigerator has boiled, B is before it has boiled, and C is when the microwave oven is not energized.
第7図、第8図にはローパスフイルタとハイパ
スフイルタを組み合わせたバンドパスフイルタ特
性をもつアンプ6の回路例と、この回路を用いて
水400c.c.を加熱した場合のアンプ出力電圧波形例
を示している。以上の結果から理解できるように
第2図の比較器7においてスレツシユホールド電
圧ΔVTと信号電圧を比較することにより、信号電
圧がΔVTより大きくなつた時に制御器4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。 Figures 7 and 8 show a circuit example of an amplifier 6 with band-pass filter characteristics that combines a low-pass filter and a high-pass filter, and an example of the amplifier output voltage waveform when this circuit is used to heat 400 c.c. of water. It shows. As can be understood from the above results, by comparing the threshold voltage ΔV T and the signal voltage in the comparator 7 of FIG. 2, the controller 4 issues a buzzer alarm when the signal voltage becomes larger than ΔV T. This will tell you when your food has reached the boiling point. It is also possible to have a configuration in which heating is stopped by turning off the power supply voltage using a controller.
本発明で用いているセンサは、温かい水分を含
む蒸気がケース34を介して熱を圧電素子30に
伝え、この熱変化の微分量に応じて信号電圧を発
生するものと考えられる。 In the sensor used in the present invention, steam containing warm moisture transfers heat to the piezoelectric element 30 via the case 34, and a signal voltage is generated in accordance with the differential amount of this thermal change.
そのために第1図の如く、電波加熱や電気加熱
中に温度上昇する加熱室の庫壁から熱的に絶縁さ
れた材料を介してセンサを取付ける本発明の構成
は、連続加温中も庫壁からの熱伝導によるセンサ
の昇温が少ないのでセンサの出力を低下させるこ
となく信号を取出すことを可能にする。 For this reason, as shown in Fig. 1, the structure of the present invention, in which the sensor is attached via a thermally insulated material from the heating chamber wall, where the temperature rises during radio wave heating or electric heating, allows the sensor to be attached to the heating chamber wall even during continuous heating. Since the temperature rise of the sensor due to heat conduction from the sensor is small, it is possible to extract a signal without reducing the output of the sensor.
さらに第9図に示すように、防振ゴム39を金
属ワツシヤ40を介して取付ける方法をとれば、
電子レンジのドアの開閉等にともなう機械振動に
よる信号の発生も防止できるものである。 Furthermore, as shown in FIG. 9, if the vibration isolating rubber 39 is attached via a metal washer 40,
It is also possible to prevent the generation of signals due to mechanical vibrations caused by opening and closing of the microwave oven door, etc.
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, a microwave oven with a food heating state detection function can be realized with an extremely simple configuration.
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用するものな
ので、粒界の目づまり防止するために、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、保守面で多くの複雑な工夫が要るが、
本発明ではそのようなものが不要である。従つて
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。 Humidity sensors and gas sensors essentially utilize the grain boundary phenomenon of the sensing element, so to prevent clogging of the grain boundaries, they must be kept warm with a heater or periodically burned to remove dirt. Many complicated measures are required in terms of maintenance, such as
The present invention does not require such a thing. Therefore, there is no need for electricity for heat retention or for roasting, making it a power-saving type.
さらに、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。また第6図bで明らかな
ように、電子レンジ内の電磁騒音や冷却フアンの
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。 Furthermore, there is no need for control parts for maintaining the accuracy of the heat-retaining heater power or a special transformer for the heater power, and the cost is low. Furthermore, as is clear from FIG. 6b, since the signal is large, stable control can be achieved with respect to the noise level caused by electromagnetic noise within the microwave oven and wind noise from the cooling fan.
さらに直流阻止アンプを用いているのでセンサ
に直流電圧が印加されることなく、イオン伝導等
による素子特性の変化が防止できる。 Furthermore, since a DC blocking amplifier is used, no DC voltage is applied to the sensor, and changes in element characteristics due to ion conduction or the like can be prevented.
センサは加熱室の壁からの熱伝導により昇温し
にくい構成をとつているので、繰り返し加熱をし
ても、信号出力の低下をきたすこともない。な
お、実施例では加熱室の排気部を1つ設けたもの
で説明したが、加熱室から排気される部分を2つ
以上設け、いずれか一方に圧電素子センサを設け
る場合も本発明に含まれるものである。 Since the sensor has a structure in which the temperature does not easily rise due to heat conduction from the walls of the heating chamber, there is no reduction in signal output even if the sensor is repeatedly heated. In addition, although the embodiment has been described with one exhaust section provided in the heating chamber, the present invention also includes a case where two or more sections are provided for exhaust from the heating chamber and a piezoelectric element sensor is provided in one of them. It is something.
第1図は本発明の一実施例の圧電素子センサ付
き電子レンジのセンサ取付部の構成図、第2図は
同圧電素子センサ付き電子レンジの構成図、第3
図〜第5図はそれぞれ電子レンジ及びセンサの断
面図、第6図a,bはそれぞれセンサ出力波形
図、第7図はバンドパスアンプの回路図、第8図
は第7図の回路の出力波形図、第9図は本発明の
他の実施例の構成図、第10図は従来例のブロツ
ク図である。
1……圧電素子センサ、3……センサ取付板、
4……加熱室壁、16……排気部、30……圧電
素子、34……ケース。
FIG. 1 is a configuration diagram of a sensor mounting part of a microwave oven equipped with a piezoelectric element sensor according to an embodiment of the present invention, FIG. 2 is a configuration diagram of the same microwave oven equipped with a piezoelectric element sensor, and FIG.
Figures 5 to 5 are cross-sectional views of the microwave oven and sensor, Figures 6a and b are sensor output waveform diagrams, Figure 7 is a circuit diagram of the bandpass amplifier, and Figure 8 is the output of the circuit in Figure 7. FIG. 9 is a block diagram of another embodiment of the present invention, and FIG. 10 is a block diagram of a conventional example. 1...Piezoelectric element sensor, 3...Sensor mounting plate,
4... Heating chamber wall, 16... Exhaust section, 30... Piezoelectric element, 34... Case.
Claims (1)
記圧電素子センサを前記加熱室の壁から熱的に絶
縁して取りつけた圧電素子センサ付き電子レン
ジ。1. A microwave oven equipped with a piezoelectric element sensor, in which a piezoelectric element sensor is provided in the exhaust part of the heating chamber, and the piezoelectric element sensor is attached to be thermally insulated from the wall of the heating chamber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17362685A JPS6237624A (en) | 1985-08-07 | 1985-08-07 | Electronic cooking range with piezoelectric element sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17362685A JPS6237624A (en) | 1985-08-07 | 1985-08-07 | Electronic cooking range with piezoelectric element sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6237624A JPS6237624A (en) | 1987-02-18 |
JPH0523334B2 true JPH0523334B2 (en) | 1993-04-02 |
Family
ID=15964097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17362685A Granted JPS6237624A (en) | 1985-08-07 | 1985-08-07 | Electronic cooking range with piezoelectric element sensor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6237624A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2532547B2 (en) * | 1988-01-29 | 1996-09-11 | 松下電器産業株式会社 | High frequency heating device with piezoelectric element sensor |
JP2523805B2 (en) * | 1988-08-03 | 1996-08-14 | 松下電器産業株式会社 | High frequency heating device with piezoelectric element sensor |
JP2851630B2 (en) * | 1988-12-09 | 1999-01-27 | 松下電器産業株式会社 | Cooker |
JP2624323B2 (en) * | 1989-03-27 | 1997-06-25 | 松下電器産業株式会社 | Pyroelectric vapor sensor and high-frequency heating device with pyroelectric vapor sensor |
JP2020188712A (en) | 2019-05-21 | 2020-11-26 | 株式会社クボタ | Cutter blade of mower |
-
1985
- 1985-08-07 JP JP17362685A patent/JPS6237624A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6237624A (en) | 1987-02-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |