JPH01146285A - heating device - Google Patents
heating deviceInfo
- Publication number
- JPH01146285A JPH01146285A JP62305013A JP30501387A JPH01146285A JP H01146285 A JPH01146285 A JP H01146285A JP 62305013 A JP62305013 A JP 62305013A JP 30501387 A JP30501387 A JP 30501387A JP H01146285 A JPH01146285 A JP H01146285A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- abnormality
- value
- heating
- change
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/203—Simultaneous scanning of two or more separate pictures, e.g. two sides of the same sheet
- H04N1/2036—Simultaneous scanning of two or more separate pictures, e.g. two sides of the same sheet of a plurality of pictures corresponding to a single side of a plurality of media
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/203—Simultaneous scanning of two or more separate pictures, e.g. two sides of the same sheet
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/50—Picture reproducers
- H04N1/506—Reproducing the colour component signals picture-sequentially, e.g. with reproducing heads spaced apart from one another in the subscanning direction
- H04N1/508—Reproducing the colour component signals picture-sequentially, e.g. with reproducing heads spaced apart from one another in the subscanning direction using the same reproducing head for two or more colour components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
- H04N1/1135—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors for the main-scan only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Electric Ovens (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電子レンジやヒータ付加熱装置の温度センサ
ーの故障判定装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a failure determination device for a temperature sensor of a microwave oven or a heater additional heat device.
従来の技術
従来より電子レンジ等に使用される温度センサーはサー
ミスタが多く、第５図に示すように単純な抵抗分割によ
り発生する電圧Ｖｐにより電圧変換がなされ、これをＡ
／Ｄ変換等を通してマイクロコンピュータ等の制御部に
より制御している。Conventional technology Conventionally, many of the temperature sensors used in microwave ovens and the like are thermistors, and as shown in Fig. 5, voltage conversion is performed using the voltage Vp generated by simple resistance division, and this is converted into A.
It is controlled by a control unit such as a microcomputer through /D conversion and the like.
故に、サーミスタの故障時Ｖｐは、サーミスタオープン
時にはＯｖ、サーミスタショートの場合には５ｖと理論
的にはなるのである。しかし、実際の装着時には、他の
抵抗成分や浮遊容量の関係で、Ｖｐ≧Ｖｓ時にサーミス
タショート、Ｖｐ≦Ｖσ時にサーミスタオープンという
ふうに電圧の巾をとって故障判定をする場合が多い。Therefore, Vp when the thermistor fails is theoretically Ov when the thermistor is open and 5V when the thermistor is shorted. However, during actual installation, due to other resistance components and stray capacitance, failures are often determined based on the voltage range, such as shorting the thermistor when Vp≧Vs and opening the thermistor when Vp≦Vσ.
発明が解決しようとする問題点
しかし、前記のような故障判定をする場合、故障判定に
巾をとっているため、低温時のＶｐがｖ５を下まわる環
境、つまりサーミスタがオープンしていないのにＶｐが
ｖ６を下まわり誤動作する場合が発生する。また、結露
等によりサーミスタの画電極がショートした場合Ｖｐが
Ｖ５を上まわりショート故障と判定することになる。こ
のように外的環境により従来の方法では誤動作する場合
が発生した。故に、最近では調理スタート後１〜２分の
時間たった後にこの判定をすることによりこの誤動作の
発生する率を下げている。Problems to be Solved by the Invention However, when making the above-mentioned failure judgment, the failure judgment takes a long time. There are cases where Vp falls below v6 and malfunction occurs. Furthermore, if the picture electrode of the thermistor is short-circuited due to dew condensation or the like, Vp exceeds V5 and a short-circuit failure is determined. As described above, the conventional method sometimes malfunctions depending on the external environment. Therefore, recently, the rate of occurrence of this malfunction has been reduced by making this determination 1 to 2 minutes after the start of cooking.
本発明はこのような従来の問題を解消するものであり、
サーミスタ等の温度センサーの故障を確実に検知できる
加熱装置を提供するものである。The present invention solves these conventional problems,
The present invention provides a heating device that can reliably detect failure of a temperature sensor such as a thermistor.
問題点を解決するための手段
加熱室と、前記加熱室内の温度を測定する温度測定手段
と、加熱手段を制御する加熱制御手段と、あらかじめ調
理温度を設定する温度設定手段と、前記温度測定手段か
らの入力値の変化を計算する測定温度変化値計算手段と
、その変化値を調査し異常判定するまでの時間を制御す
る検知時間発生手段と、異常判定時に異常報知する手段
を備え、調理開始時から異常判定する時間までの測定値
の変化が一定値より小さい場合温度測定手段が異常であ
ると判定する異常判定手段を構成し、また調理中の前記
温度測定手段からの測定値と前記温度設定手段からの設
定値の大小比較により、異常判定するまでの時間を各々
設定し前記検知時間発生手段を起動する構成とし、また
調理中の前記温度測定手段からの測定値と前記温度設定
手段からの設定値の比較により、異常検知する判定の変
化値を各々設定する構成としたものである。Means for Solving the Problems A heating chamber, a temperature measuring means for measuring the temperature inside the heating chamber, a heating control means for controlling the heating means, a temperature setting means for setting a cooking temperature in advance, and the temperature measuring means The device is equipped with a measured temperature change value calculation means for calculating the change in the input value from the input value, a detection time generation means for controlling the time taken to investigate the change value and determine an abnormality, and a means for notifying an abnormality when an abnormality is determined. The temperature measuring means constitutes an abnormality determining means that determines that the temperature measuring means is abnormal if the change in the measured value from the time to the time at which the abnormality is determined is smaller than a certain value, and the measured value from the temperature measuring means during cooking and the temperature By comparing the set values from the setting means, the time until an abnormality is determined is set respectively, and the detection time generating means is activated. The configuration is such that a change value for determining whether an abnormality is detected is set by comparing the set values of .
作 用
本発明の加熱装置は、加熱時に加熱手段がＯＮしている
場合は、加熱室内にエネルギーが入るため、正常なサー
ミスタは必ず抵抗値が変化し、っまりＶｐも速い傾斜で
変化するはずであり、短時間のかなり大きなＶｐの変化
があるかどうかでサーミスタの故障が判定できる。また
加熱手段がＯＦＦの場合は、エネルギーの供給がないた
め、自然の放置によるサーミスタの抵抗変化しかない。Function: In the heating device of the present invention, when the heating means is turned on during heating, energy enters the heating chamber, so the resistance value of a normal thermistor always changes, and the Vp should also change at a fast slope. Therefore, a failure of the thermistor can be determined based on whether there is a fairly large change in Vp in a short period of time. Furthermore, when the heating means is OFF, there is no energy supply, so the resistance of the thermistor only changes due to natural neglect.
つまりＶｐの変化の傾斜もゆるやかになるため、少々長
めでさらに小さな抵抗変化をつかむことによりサーミス
タの故障をつかむことができる。これによりサーミスタ
のオープン・ショートや温度変化があっても抵抗値が変
化しないような故障についても判定することができより
安全性の高い、誤動作の少ない加熱装置が提供できるよ
うになった。In other words, since the slope of the change in Vp becomes gentler, it is possible to detect a thermistor failure by detecting a slightly longer and smaller resistance change. This makes it possible to detect failures such as opens and shorts in thermistors and failures in which the resistance value does not change even with temperature changes, making it possible to provide a heating device with higher safety and fewer malfunctions.
実施例 以下本発明の一実施例について図面に基づき説明する。Example An embodiment of the present invention will be described below based on the drawings.
第１図に示すように加熱室の温度はサーミスタを使用し
た温度センサー人力手段１により測定される。また、加
熱時には前もってキー人力等により温調温度を温度設定
手段２により入力されている。この２つの入力手段から
の情報を比較する温度比較手段３により測定温度〈設定
温度の場合は加熱制御手段４を通して加熱手段５をＯＮ
する。また逆に測定温度≧設定温度の場合は同様にして
加熱手段５をＯＦＦする。次に、この２つの状態、つま
り加熱手段５をＯＮＬ、てエネルギーを供給している状
態と、ＯＦＦしてエネルギーの供給をしていない状態で
検知までの測定時間ＴＣを別々にカウントする（ＴｃＯ
Ｎ、Ｔｃ０ＦＦ）検知時間測定手段６によりカウンター
を起動しておく。そのカウンターがＵＰした時の温度と
起動時の温度を温度センサー人力手段１により測定し、
温度変化を測定温度変化値計算手段７により計算するこ
とにより前述の２つの状態で各々の判定値（ΔＴＯＮ、
ΔＴＯＦＦ）と比較し、変化が判定値より小さい場合は
サーミスタが温度に追従していないものと判定する異常
判定手段８により加熱制御手段４を通して加熱手段５を
０ＦＦＬ、加熱を停止するとともに、ブザーや表示など
の異常報知手段９により使用者に知らせる。As shown in FIG. 1, the temperature of the heating chamber is measured by a temperature sensor manual means 1 using a thermistor. Further, during heating, the temperature control temperature is input in advance by the temperature setting means 2 by manual keystroke or the like. The temperature comparison means 3 which compares the information from these two input means turns on the measured temperature (if the set temperature is reached, the heating means 5 is turned on through the heating control means 4).
do. Conversely, if the measured temperature≧set temperature, the heating means 5 is similarly turned off. Next, the measurement time TC until detection is counted separately in these two states, that is, a state in which the heating means 5 is turned on and supplying energy, and a state in which it is turned off and not supplied with energy (TcO
N, Tc0FF) A counter is activated by the detection time measuring means 6. The temperature when the counter goes up and the temperature at startup are measured by temperature sensor manual means 1,
By calculating the temperature change by the measured temperature change value calculation means 7, each judgment value (ΔTON,
ΔTOFF), and if the change is smaller than the judgment value, it is determined that the thermistor is not following the temperature.The abnormality judgment means 8 sets the heating means 5 to 0FFL through the heating control means 4, and stops heating. The user is notified by abnormality notification means 9 such as a display.
第２図は本発明の一実施例であるヒータ付電子レンジの
判面図を示す。加熱室１ｏには、被加熱物１１を加熱す
るヒータ１２と、マグネトロン１３が接続されている。FIG. 2 shows a front view of a microwave oven with a heater, which is an embodiment of the present invention. A heater 12 that heats the object to be heated 11 and a magnetron 13 are connected to the heating chamber 1o.
加熱室１０の温度はサーミスタ１４によって測定される
。The temperature of the heating chamber 10 is measured by a thermistor 14.
第３図は前記サーミスタ１４によって測定した加熱時の
加熱室１ｏの温度変化を示すグラフである。第３図（ａ
ｌ〜（，１は横軸を時間（ｔｌｒｎｅ）、縦軸を温度（
ＴＥＭＰレベル）としている。第３図は、正常時のグラ
フであり設定温度より低い温度で調理が開始され、加熱
手段のエネルギーにより温度が上昇し設定温度で加熱手
段を断続し温度を保持している。第３図（ｂｌはサーミ
スタがショート時はＡ線でオープン時がＢ線である。ま
たＣ線は、サーミスタの内部で何らかの抵抗値で固定さ
れ温度に追従しなくなった場合の故障時のグラフで、Ａ
線。FIG. 3 is a graph showing the temperature change in the heating chamber 1o during heating as measured by the thermistor 14. Figure 3 (a
l~(, 1 represents time (tlrne) on the horizontal axis and temperature (tlrne) on the vertical axis
TEMP level). FIG. 3 is a graph during normal operation, in which cooking is started at a temperature lower than the set temperature, the temperature rises due to the energy of the heating means, and the temperature is maintained by intermittent operation of the heating means at the set temperature. Figure 3 (bl is line A when the thermistor is short-circuited and line B when it is open. Line C is a graph at the time of failure when the thermistor is fixed with some resistance value inside and no longer follows the temperature. ,A
line.
Ｂ線、Ｃ線とも永久に温度変化がほとんどない状態であ
る。第３図（ｃ）は、周囲環境によるグラフである。Ｏ
線は低温時から調理が始まった場合の例でスタート時は
、オープンレベルと同じくらい低い温度レベルであるが
エネルギーが供給されることにより、ＴＯＮカウント後
はΔＴ１の変化がありΔＴ１≧ΔＴＯＮであればサーミ
スタは正常と判断でき、第３図（ｂｌ Ｂ線のオープン
判定と区別できる。Both the B line and the C line are in a state where there is almost no temperature change forever. FIG. 3(c) is a graph based on the surrounding environment. O
The line is an example of when cooking starts from a low temperature.At the start, the temperature level is as low as the open level, but as energy is supplied, after TON is counted, there is a change of ΔT1, even if ΔT1≧ΔTON. If so, the thermistor can be determined to be normal, and can be distinguished from the open determination of the B line in Figure 3 (bl).
またＥ線は高温時、あるいは結露時の環境で調理が始ま
った場合の例で、初期温レベルが設定より大きいため、
加熱手段５からのエネルギー供給がないため、自然冷却
で温度レベルが降下していき、ＴＣＯＦＦ後のΔＴ２の
変化がΔＴ２≧ΔＴＯＦＦであればサーミスタは正常と
判断でき第３図（ｂｌ Ａ線のショート判定と区別でき
る。Line E is an example of when cooking starts in a high temperature or dew environment, and the initial temperature level is higher than the setting.
Since there is no energy supply from the heating means 5, the temperature level will drop due to natural cooling, and if the change in ΔT2 after TCOFF is ΔT2≧ΔTOFF, it can be determined that the thermistor is normal. Can be distinguished from judgment.
第４図は、本発明の制御プログラムのフローチャートで
ある。まず、測定値と設定値の比較をしくステップ１５
）測定値≧設定の場合は加熱手段をｏＦＦしくステップ
１６）ＴＣＯＮカウンタをクリアしくステップ１．７”
）、ＴＣＯＦＦカウンタをアップする（ステップ１８）
。このＴＣＯＦＦがアップした時にその間の変化量とΔ
ＴＯＦＦとを比較して（ステップ１９）変化量くΔＴＯ
ＦＦの場合異常報告へ行く（ステップ２０）。また測定
値く設定値の場合は加熱手段をＯＮしくステップ２１）
、ＴＣＯＦＦをクリアしくステップ２２）、ＴＯＮカウ
ンタをカウントアツプしていき（ステップ２３）、アッ
プした時点でその間の変化量とΔＴＯＮを比較しくステ
ップ２４）変化量くΔＴＯＮの時異常報知となり（ステ
ップ２０）加熱も停止できる。FIG. 4 is a flowchart of the control program of the present invention. First, compare the measured value and set value.Step 15
) If the measured value ≧ setting, turn off the heating means Step 16) Clear the TCON counter Step 1.7”
), up the TCOFF counter (step 18)
. When this TCOFF increases, the amount of change during that time and Δ
Compare with TOFF (step 19) and find the amount of change ΔTO
If it is FF, go to abnormality report (step 20). Also, if the measured value is less than the set value, turn on the heating means (step 21).
, clear TCOFF (Step 22), count up the TON counter (Step 23), and when it counts up, compare the amount of change during that time with ΔTON.Step 24) When the amount of change is less than ΔTON, an abnormality is notified (Step 20). ) Heating can also be stopped.
発明の効果
以上のように本発明の加熱装置では、サーミスタの変化
を測定することでサーミスタの故障判定が簡単に確実に
することができる。つまりこれは、サーミスタの故障に
かかわらず加熱装置が動作した場合の発火等の危険状態
をなくすことになり安全な加熱装置が供給できる。また
、この発明はマイクロコンピュータ−のプログラムで実
現でき、コスト的にも外因のノイズにも有利である。Effects of the Invention As described above, in the heating device of the present invention, failure of the thermistor can be easily and reliably determined by measuring changes in the thermistor. In other words, this eliminates a dangerous situation such as ignition when the heating device operates regardless of a failure of the thermistor, and a safe heating device can be provided. Further, the present invention can be realized by a microcomputer program, which is advantageous in terms of cost and noise caused by external causes.
第１図は本発明の一実施例におけるブロック図、第２図
は同装置の断面図、第３図−蕊−は同加熱１・・・・・
・温度センサー人力手段、２・・・・・・温度設定手段
、３・・・・・・温度比較手段、４・・・・・・加熱制
御手段、５・・・・・・加熱手段、６・・・・・・検知
時間測定手段、７・・・・・・測定温度変化値計算手段
、８・・・・・・異常判定手段、９・・・・・・異常報
知手段。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第２
図
第４図
第５図
５ＨＯＲＴＳ−ＥＶ
ＯＰＥＮ縛＝ＯＶFig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a cross-sectional view of the same device, and Fig. 3 - Fig. 3 shows the same heating 1...
・Temperature sensor manual means, 2... Temperature setting means, 3... Temperature comparison means, 4... Heating control means, 5... Heating means, 6 . . . Detection time measurement means, 7 . . . Measured temperature change value calculation means, 8 . . . Abnormality determination means, 9 . . . Abnormality notification means. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 4 Figure 5 5HORTS-EV OPEN binding = OV
Claims (3)
定手段と、加熱手段を制御する加熱制御手段と、あらか
じめ調理温度を設定する温度設定手段と、前記温度測定
手段からの入力値の変化を計算する測定温度変化値計算
手段と、その変化値を調査し異常判定するまでの時間を
制御する検知時間発生手段と、異常判定時に異常報知す
る手段を備え、調理開始時から異常判定する時間までの
測定値の変化が一定値より小さい場合温度測定手段が異
常であると判定する異常判定手段を構成した加熱装置。(1) A heating chamber, a temperature measuring means for measuring the temperature inside the heating chamber, a heating control means for controlling the heating means, a temperature setting means for setting a cooking temperature in advance, and an input value from the temperature measuring means. It is equipped with a measured temperature change value calculation means for calculating the change, a detection time generation means for controlling the time until it investigates the change value and determines an abnormality, and a means for notifying an abnormality when an abnormality is determined, and determines an abnormality from the start of cooking. A heating device comprising an abnormality determining means that determines that the temperature measuring means is abnormal when a change in a measured value over time is smaller than a certain value.
段からの設定値の大小比較により、異常判定するまでの
時間を各々設定し前記検知時間発生手段を起動する構成
とした特許請求の範囲第１項記載の加熱装置。(2) By comparing the magnitude of the measured value from the temperature measuring means during cooking and the set value from the temperature setting means, a time period until an abnormality is determined is set respectively, and the detection time generating means is activated. The heating device according to scope 1.
段からの設定値の比較により、異常検知する判定の変化
値を各々設定する構成とした特許請求の範囲第１項記載
の加熱装置。(3) The heating device according to claim 1, wherein a change value for determining abnormality is set by comparing the measured value from the temperature measuring means during cooking and the set value from the temperature setting means. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62305013A JPH01146285A (en) | 1987-12-01 | 1987-12-01 | heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62305013A JPH01146285A (en) | 1987-12-01 | 1987-12-01 | heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01146285A true JPH01146285A (en) | 1989-06-08 |
Family
ID=17940038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62305013A Pending JPH01146285A (en) | 1987-12-01 | 1987-12-01 | heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01146285A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5429111A (en) * | 1992-03-26 | 1995-07-04 | Matsushita Electric Industrial Co., Ltd. | Gas burning apparatus |
| JP2010029534A (en) * | 2008-07-30 | 2010-02-12 | Harman Pro:Kk | Cooking device with grill |
| US20110164889A1 (en) * | 2010-01-05 | 2011-07-07 | Ricoh Company, Ltd. | Heating unit and its malfunction determining method, image fixing device, and image forming apparatus |
| JP2013116342A (en) * | 2013-02-12 | 2013-06-13 | Harman Co Ltd | Cooker with grill |
| CN112067153A (en) * | 2020-08-15 | 2020-12-11 | 广东万和新电气股份有限公司 | Temperature detection device of thermistor and intelligent household appliance |
| JP2022114499A (en) * | 2021-01-27 | 2022-08-08 | 日立グローバルライフソリューションズ株式会社 | heating cooker |
-
1987
- 1987-12-01 JP JP62305013A patent/JPH01146285A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5429111A (en) * | 1992-03-26 | 1995-07-04 | Matsushita Electric Industrial Co., Ltd. | Gas burning apparatus |
| JP2010029534A (en) * | 2008-07-30 | 2010-02-12 | Harman Pro:Kk | Cooking device with grill |
| US20110164889A1 (en) * | 2010-01-05 | 2011-07-07 | Ricoh Company, Ltd. | Heating unit and its malfunction determining method, image fixing device, and image forming apparatus |
| US8494381B2 (en) * | 2010-01-05 | 2013-07-23 | Ricoh Company, Ltd. | Heating unit and its malfunction determining method, image fixing device, and image forming apparatus |
| JP2013116342A (en) * | 2013-02-12 | 2013-06-13 | Harman Co Ltd | Cooker with grill |
| CN112067153A (en) * | 2020-08-15 | 2020-12-11 | 广东万和新电气股份有限公司 | Temperature detection device of thermistor and intelligent household appliance |
| JP2022114499A (en) * | 2021-01-27 | 2022-08-08 | 日立グローバルライフソリューションズ株式会社 | heating cooker |
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