JPH062859A - Microwave oven - Google Patents
Microwave ovenInfo
- Publication number
- JPH062859A JPH062859A JP18619792A JP18619792A JPH062859A JP H062859 A JPH062859 A JP H062859A JP 18619792 A JP18619792 A JP 18619792A JP 18619792 A JP18619792 A JP 18619792A JP H062859 A JPH062859 A JP H062859A
- Authority
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- Japan
- Prior art keywords
- weight
- food
- thawing
- heated
- minimum value
- 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.)
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- Electric Ovens (AREA)
- Freezing, Cooling And Drying Of Foods (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、冷凍食品の解凍機能を
備えた電子レンジ等の高周波加熱装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating device such as a microwave oven having a function of thawing frozen food.
【０００２】[0002]
【従来の技術】解凍機能を備えた従来の電子レンジとし
て、誘電体損と温度との関係に着目し、冷凍食品に吸収
されないマイクロ波をアンテナ及び検波回路で検波して
検波回路の出力の最小値から食品の重量を検出する電子
レンジが開示されている（特開平2-306025号）。これ
は、食品の一部が氷点（−２℃）付近になると誘電体損
が増加してその部分にマイクロ波が吸収され始めるた
め、検波回路の出力が急速に低下して最小値となるとと
もに、検波出力の最小値と食品の重量とに相関関係が有
ることを利用している。2. Description of the Related Art As a conventional microwave oven with a thawing function, focusing on the relationship between dielectric loss and temperature, microwaves that are not absorbed by frozen foods are detected by an antenna and a detection circuit to minimize the output of the detection circuit. A microwave oven for detecting the weight of food from the value is disclosed (JP-A-2-306025). This is because when a part of food comes close to the freezing point (-2 ° C), the dielectric loss increases and microwaves start to be absorbed in that part, so the output of the detection circuit rapidly decreases and reaches the minimum value. , The correlation between the minimum value of detection output and the weight of food is used.
【０００３】[0003]
【発明が解決しようとする課題】ところで、従来の電子
レンジではマイクロ波を連続発振して食品の重量を検出
しているので、食品が軽量の場合、又は重量検出用の高
周波電源が高出力の場合、重量の検出期間中に食品の煮
え，加熱ムラ等が生じてしまう。By the way, in the conventional microwave oven, microwaves are continuously oscillated to detect the weight of food, so that the weight of the food is high or the high-frequency power source for weight detection has a high output. In this case, food will boil, heating will be uneven during the weight detection period.
【０００４】また、牛ミンチ肉では八分の解凍が好まし
いが、さしみでは50％程度の解凍が好ましいといったよ
うに食品の種類によって好ましい解凍の程度が異なる。
さらに、同じ食品であっても解凍初期の温度によって解
凍に要する時間が異なってくる。しかし、食品の種類，
初期温度を検出する有効な手段は考案されていない。[0004] For minced beef meat, thawing for eight minutes is preferable, but for sashimi, thawing at about 50% is preferable.
Furthermore, even for the same food, the time required for thawing varies depending on the initial temperature of thawing. But the type of food,
No effective means has been devised to detect the initial temperature.
【０００５】本発明はこのような問題点を解決するため
になされたものであって、被加熱物の重量を検出する高
周波を間欠的に放射することにより、検出期間中の被加
熱物の煮え，加熱ムラ等を防止して最適の解凍状態が得
られる高周波加熱装置の提供を目的とする。The present invention has been made in order to solve such a problem, and by intermittently radiating a high frequency for detecting the weight of an object to be heated, the object to be heated is boiled during the detection period. An object of the present invention is to provide a high-frequency heating device that can prevent uneven heating and the like to obtain an optimum defrosted state.
【０００６】また、本発明は、被加熱物の重量を検出す
るまでに放射された高周波の間欠放射の回数に基づいて
被加熱物の種類又は初期温度を弁別することにより、最
適の解凍状態が得られる高周波加熱装置の提供を目的と
する。Further, the present invention discriminates the type or initial temperature of the object to be heated on the basis of the number of times of high frequency intermittent radiation radiated until the weight of the object to be heated is detected. The purpose is to provide a high-frequency heating device to be obtained.
【０００７】[0007]
【課題を解決するための手段】第１の発明に係る高周波
加熱装置は、マイクロ波を庫内に放射して該庫内の被加
熱物を解凍する高周波加熱装置において、マイクロ波を
間欠的に放射する手段と、庫内のマイクロ波の一部を検
知して検知レベルに応じた信号を出力する手段と、マイ
クロ波の各放射周期における前記検知レベルのうちの最
小値を検出する手段と、該最小値に基づき被加熱物の重
量を検出する手段と、検出重量に応じた解凍終了時刻を
決定する手段とを備えたことを特徴とする。A high frequency heating apparatus according to a first aspect of the present invention is a high frequency heating apparatus for radiating a microwave into a refrigerator to thaw an object to be heated in the refrigerator, the microwave being intermittently applied. Means for radiating, means for detecting a part of the microwave in the refrigerator and outputting a signal according to the detection level, means for detecting the minimum value of the detection level in each radiation cycle of the microwave, It is characterized by comprising means for detecting the weight of the object to be heated based on the minimum value and means for determining the thawing end time according to the detected weight.
【０００８】第２の発明に係る高周波加熱装置は、さら
に、前記検知レベルが最小値に至るまでに繰り返された
マイクロ波の間欠的放射の回数に基づいて被加熱物の種
類又は解凍開始時の初期温度を判別する手段と、検出重
量に応じて決定した解凍終了時刻を、被加熱物の種類又
は初期温度に応じて修正する手段とを備えたことを特徴
とする。The high-frequency heating apparatus according to the second aspect of the present invention further determines the type of object to be heated or the start of thawing based on the number of times the microwave is intermittently radiated repeatedly until the detection level reaches a minimum value. It is characterized by comprising means for determining the initial temperature and means for correcting the thawing end time determined according to the detected weight according to the type of the object to be heated or the initial temperature.
【０００９】第３の発明に係る高周波加熱装置は、これ
らに加えて、マイクロ波の間欠的放射の開始から複数周
期における前記検知レベルのうちの最大値を検出する手
段と、該最大値と、被加熱物を重量別に大別すべく定め
た所定値とを比較する手段と、比較結果に応じて、被加
熱物の重量を検出するためのマイクロ波の間欠放射の回
数を決定する手段とを備えたことを特徴とする。In addition to these, the high frequency heating apparatus according to the third aspect of the present invention further comprises means for detecting the maximum value of the detection levels in a plurality of cycles from the start of the intermittent emission of microwaves, and the maximum value. Means for comparing with a predetermined value determined to roughly divide the objects to be heated by weight, and means for determining the number of times of intermittent radiation of microwaves for detecting the weight of the objects to be heated according to the comparison result. It is characterized by having.
【００１０】[0010]
【作用】第１の発明に係る高周波加熱装置は、マイクロ
波を庫内に間欠的に放射し、庫内のマイクロ波の一部を
検知して検知レベルに応じた信号を出力し、各間欠放射
時における検知レベルのうちの最小値を検出し、この最
小値に基づき被加熱物の重量を検出して重量に応じた解
凍終了時刻を決定する。The high-frequency heating apparatus according to the first aspect of the present invention intermittently radiates microwaves into the refrigerator, detects a part of the microwaves inside the refrigerator, and outputs a signal corresponding to the detection level. The minimum value of the detection levels during radiation is detected, the weight of the object to be heated is detected based on this minimum value, and the thawing end time corresponding to the weight is determined.
【００１１】第２の発明に係る高周波加熱装置は、さら
に、マイクロ波の検知レベルが最小値に至るまでに繰り
返されたマイクロ波の間欠放射の回数に基づいて被加熱
物の種類又は解凍開始時の初期温度を弁別し、検出重量
に応じて決定した解凍終了時刻を、被加熱物の種類又は
初期温度に応じて修正し、最適の解凍状態を得る。The high-frequency heating apparatus according to the second aspect of the present invention further includes the type of object to be heated or the start of thawing based on the number of times the microwave is intermittently radiated repeatedly until the level of microwave detection reaches a minimum value. The initial thawing temperature is discriminated, and the thawing end time determined according to the detected weight is corrected according to the type of the object to be heated or the initial temperature to obtain the optimum thawing state.
【００１２】第３の発明に係る高周波加熱装置は、マイ
クロ波の間欠放射の開始から複数周期における検知レベ
ルのうち最大値を検出し、この最大値を所定値と比較し
て最大値が所定値以上で被加熱物が軽量の場合はマイク
ロ波の間欠放射の回数を少なく設定し、また、所定値以
下で重量の場合は回数を相対的に多く設定し、重量検出
に先立って被加熱物を重量別に大別する。The high-frequency heating apparatus according to the third invention detects the maximum value of the detection levels in a plurality of cycles from the start of the intermittent radiation of microwaves, compares the maximum value with a predetermined value, and the maximum value is the predetermined value. If the object to be heated is lightweight as described above, the number of times the microwave is intermittently radiated is set to a small number, and if the object to be heated is a predetermined value or less and the weight is set to be relatively large, the object to be heated is detected prior to weight detection. It is roughly divided by weight.
【００１３】[0013]
【実施例】以下、本発明をその実施例を示す図に基づい
て説明する。図１は本発明に係る電子レンジ（以下、本
発明装置という）の構成を示す模式的ブロック図であ
る。図中１は被加熱物である食品、２は食品１を収納す
る加熱室、３は食品１を載せるターンテーブルであっ
て、ターンテーブル２はモータ４により回転されてター
ンテーブル２上の食品１が均一に加熱される。加熱室２
の上壁21には導波口としてのスリット21a が設けられ、
スリット21a を介して加熱室２から漏洩するマイクロ波
は、受信アンテナ及び検波回路からなるマイクロ波セン
サ51で直流検波され、マイクロ波センサ51は検知レベル
に応じた信号を出力する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments. FIG. 1 is a schematic block diagram showing a configuration of a microwave oven according to the present invention (hereinafter, referred to as an apparatus of the present invention). In the figure, 1 is a food to be heated, 2 is a heating chamber for storing the food 1, 3 is a turntable on which the food 1 is placed, and the turntable 2 is rotated by a motor 4 and the food 1 on the turntable 2 is rotated. Are heated uniformly. Heating chamber 2
The upper wall 21 is provided with a slit 21a as a waveguide port,
The microwave leaking from the heating chamber 2 through the slit 21a is subjected to DC detection by a microwave sensor 51 including a receiving antenna and a detection circuit, and the microwave sensor 51 outputs a signal according to the detection level.
【００１４】マイクロ波センサ51が出力する検波信号は
増幅部６によって増幅されてマイクロコンピュータから
なる制御部７に入力され、制御部７は入力された検波信
号に応じて、マイクロ波放射源であるマグネトロン10を
オン・オフする駆動部８、及びマグネトロン10を冷却す
るスターラー11の動作を制御する。また、制御部７には
食品１の重量、及び解凍初期の温度又は食品１の種類別
に解凍時間，マグネトロン10の駆動制御方法等が定めら
れた解凍プログラムが記憶されている。高圧トランス，
高圧コンデンサ等からなるマグネトロン発振駆動部９
は、駆動部８からのオン・オフ信号に従ってマグネトロ
ン10を発振・停止させて加熱室２内にマイクロ波を間欠
的に放射させる。The detection signal output from the microwave sensor 51 is amplified by the amplification unit 6 and input to the control unit 7 composed of a microcomputer, and the control unit 7 is a microwave radiation source according to the input detection signal. The operation of the drive unit 8 for turning on / off the magnetron 10 and the operation of the stirrer 11 for cooling the magnetron 10 are controlled. Further, the control unit 7 stores a defrosting program that defines the weight of the food 1, the temperature at the initial stage of the defrosting, the defrosting time for each type of the food 1, the drive control method of the magnetron 10, and the like. High voltage transformer,
Magnetron oscillation drive unit 9 consisting of a high-voltage capacitor, etc.
Causes the magnetron 10 to oscillate / stop in response to an ON / OFF signal from the drive unit 8 to intermittently radiate microwaves into the heating chamber 2.
【００１５】図２は食品重量とマイクロ波センサ51の出
力（最小値）との関係を示すグラフである。前述のよう
に、マイクロ波センサ51は、食品の一部が氷点（−２
℃）付近になると誘電体損が増加してその部分にマイク
ロ波が吸収され始めるため、出力が急速に低下して最小
値となる。図から明らかなように、牛ミンチ肉，牛スラ
イス肉，イカ，マグロ，豚スライス肉，エビといった６
種類の食品の重量とセンサ出力の最小値との間に相関関
係が見られる。FIG. 2 is a graph showing the relationship between the food weight and the output (minimum value) of the microwave sensor 51. As described above, in the microwave sensor 51, a part of food is frozen (-2
(° C), the dielectric loss increases and microwaves start to be absorbed in that part, so that the output rapidly decreases to the minimum value. As you can see from the figure, minced beef, sliced beef, squid, tuna, sliced pork, shrimp 6
There is a correlation between the weight of different food types and the minimum value of the sensor output.
【００１６】図３は本発明装置による解凍の手順を示す
フローチャートである。マグネトロン発振駆動部９から
のパルス波のデューティー比を調整してマグネトロン10
からマイクロ波を間欠的に放射する間欠運転を開始し(S
1)、間欠放射の第１及び第２周期における加熱時のセン
サ出力の平均値Ｖ1 ，Ｖ2 を算出する(S2)。第１及び第
２周期のセンサ出力の平均値Ｖ1 ，Ｖ2 のうち、大きい
方の平均値をＶとし(S3)、この平均値Ｖと、食品を軽量
か重量かで二分するために定めたセンサ出力のしきい値
Ｖref とを比較する(S4)。なお、検出初期の複数周期の
平均値のうちから最大値を求める理由は図７に基づいて
後述する。FIG. 3 is a flow chart showing the defrosting procedure by the device of the present invention. The duty ratio of the pulse wave from the magnetron oscillation drive unit 9 is adjusted to adjust the magnetron 10
The intermittent operation that radiates microwaves intermittently is started from (S
1), average values V 1 and V 2 of the sensor output during heating in the first and second cycles of intermittent radiation are calculated (S2). Of the average values V 1 and V 2 of the sensor outputs in the first and second cycles, the larger average value is set as V (S3), and this average value V is determined to divide the food into light weight or weight. The sensor output threshold Vref is compared (S4). The reason for obtaining the maximum value from the average values of a plurality of cycles at the initial stage of detection will be described later with reference to FIG.
【００１７】平均値Ｖがしきい値Ｖref 以上、即ち食品
が軽量の場合、重量検出に要する間欠放射を５周期と
し、第５周期迄の加熱時のセンサ出力の平均値を算出す
る(S5)。しきい値Ｖref 以上を軽量と判定するのは、負
荷が小さいほどマイクロ波の吸収量が少なく相対的にマ
イクロ波センサ51の出力が大きくなるためである。第５
周期迄の平均値Ｖ1 ，Ｖ2 ，…，Ｖ5 のうち、最小値を
ＶB とし(S6)、最小値ＶB の関数ｆB （ＶB ）で食品重
量ｍを求める(S7)。次に、最小値ＶB が得られる迄の周
期回数が３回以下であるか否かを判定する(S9)。When the average value V is equal to or greater than the threshold value V ref , that is, when the food is lightweight, the intermittent radiation required for weight detection is set to 5 cycles, and the average value of the sensor output during heating up to the 5th cycle is calculated (S5 ). The reason why the threshold value V ref or more is determined to be lightweight is that the smaller the load, the smaller the amount of microwave absorption and the relatively larger the output of the microwave sensor 51. Fifth
Of the average values V 1 , V 2 , ..., V 5 up to the cycle, the minimum value is set to V B (S6), and the food weight m is obtained by the function f B (V B ) of the minimum value V B (S7). Next, it is determined whether the number of cycles until the minimum value V B is obtained is 3 times or less (S9).
【００１８】最小値ＶB が得られる迄の周期回数を判定
する理由は、同一重量の食品において、初期温度が高い
ほど早期に最小値が得られるが、初期温度が低いほど最
小値が得られるまでに多くの周期回数を要するからであ
る。図４は初期温度が−19℃と−10℃との牛ミンチ肉 3
00ｇの解凍状態の変化を示すグラフである。図から明ら
かなように、初期温度−10℃では第４周期ですでにセン
サ出力が最小値となっているのに対し、初期温度−19℃
では第８周期で最小値となっている。The reason for determining the number of cycles until the minimum value V B is obtained is that the higher the initial temperature is, the earlier the minimum value is obtained, but the lower the initial temperature is, the more the minimum value is obtained in the case of foods of the same weight. This is because it takes a large number of cycles to complete. Figure 4 shows minced beef with initial temperatures of -19 ° C and -10 ° C 3
It is a graph which shows the change of the defrosting state of 00g. As is clear from the figure, at the initial temperature of -10 ° C, the sensor output has already reached the minimum value in the 4th cycle, whereas at the initial temperature of -19 ° C
Has the minimum value in the eighth cycle.
【００１９】また、重量及び初期温度が等しい食品であ
っても、食品の種類によって最小値が得られる周期回数
が異なる。図５は重量及び初期温度がほぼ等しい牛ミン
チ肉 300ｇ（初期温度−19℃）とマグロ 300ｇ（初期温
度−18℃）との解凍状態の変化を示すグラフである。図
から明らかなように、さしみのセンサ出力はすでに第３
周期で最小値となり、八分解凍が好ましい牛ミンチ肉の
センサ出力は第８周期で最小値となる。Further, even for foods having the same weight and initial temperature, the number of cycles for obtaining the minimum value differs depending on the type of food. FIG. 5 is a graph showing changes in the thawing state of minced beef meat 300 g (initial temperature −19 ° C.) and tuna 300 g (initial temperature −18 ° C.) whose weight and initial temperature are almost the same. As can be seen from the figure, the sensor output of the sashimi is already the third
The sensor output of minced beef meat, which has the minimum value in the cycle and is preferably thawed for eight minutes, has the minimum value in the eighth cycle.
【００２０】このように、重量から求まる解凍時間より
短い解凍時間が望ましい、初期温度が比較的高い食品
と、50％程度の解凍が好ましいさしみ等の食品とには、
センサ出力の最小値が早期に得られるという同じ傾向が
見られる。As described above, foods having a relatively high initial temperature in which the thawing time shorter than the thawing time obtained from the weight is desirable and foods such as sashimi which thawing about 50% are preferable,
The same tendency is seen that the minimum value of the sensor output is obtained early.
【００２１】従って、ステップS9の判定の結果、最小値
ＶB が出る迄の周期回数が３回を超える場合は、八分解
凍まで行う解凍コース（Ｂ）を起動してマグネトロン出
力及び解凍時間を制御し(S10) 、一方、最小値ＶB が出
る迄の周期回数が３回以下の場合は、50％解凍程度で解
凍を終了する短期の解凍コース（Ｂ’）を起動してマグ
ネトロン出力及び解凍時間を制御する(S11) 。Therefore, if the result of determination in step S9 is that the number of cycles until the minimum value V B appears is more than 3, the defrosting course (B), which is performed up to eight minutes defrosting, is activated to set the magnetron output and defrosting time. If the number of cycles until the minimum value V B is reached is 3 or less, the short-term thawing course (B ′) that completes the thawing at about 50% thawing is started and the magnetron output and Control the thawing time (S11).
【００２２】一方、ステップS4の判定の結果、センサ出
力の最大値Ｖがしきい値Ｖref 未満、即ち重量の場合、
重量検出に要する間欠放射を８周期とし、第８周期迄の
加熱時のセンサ出力の平均値を算出する(S12) 。第８周
期迄の平均値Ｖ1 ，Ｖ2 ，…，Ｖ8 のうち、最小値をＶ
A とする(S13) 。最小値ＶA の関数ｆA （ＶA ）で食品
重量ｍを求め(S14) 、最小値ＶA が得られる迄の周期回
数が５回以下であるか否かを判定する(S15) 。On the other hand, if the result of determination in step S4 is that the maximum value V of the sensor output is less than the threshold value V ref , that is, if it is weight,
The intermittent radiation required for weight detection is set to 8 cycles, and the average value of the sensor output during heating up to the 8th cycle is calculated (S12). Of the average values V 1 , V 2 , ..., V 8 up to the eighth cycle, the minimum value is V
Let it be A (S13). Seeking food weight m at minimum V A of the function f A (V A) (S14 ), number of cycles until the minimum value V A is obtained is equal to or less than 5 times (S15).
【００２３】ステップS9の判定の結果、最小値ＶB が出
る迄の周期回数が５回を超える場合は、八分解凍まで行
う解凍コース（Ａ）を起動してマグネトロン出力及び解
凍時間を制御し(S17) 、また、最小値ＶA が出る迄の周
期回数が５回以下の場合は、50％解凍程度で解凍を終了
する短期の解凍コース（Ａ’）を起動してマグネトロン
出力及び解凍時間を制御する(S18) 。起動した各解凍コ
ースに定められた解凍時間が終了したか否かを判定し(S
19)、終了した場合はマイクロ波の放射を停止する(S20)
。If the result of determination in step S9 is that the number of cycles until the minimum value V B appears is more than 5, the defrosting course (A) for thawing for eight minutes is activated to control the magnetron output and the defrosting time. (S17) If the number of cycles until the minimum value V A appears is 5 times or less, start the short-term thawing course (A ') that finishes the thawing at about 50% thawing, and output the magnetron and thawing time. Control (S18). It is determined whether the thawing time set for each started thawing course has ended (S
19), stop microwave radiation when completed (S20)
.
【００２４】図６は高周波出力と各周期の加熱時におけ
るマイクロ波センサ51の検波平均電圧との一般的な関係
を時間軸上に示した図である。間欠的に放射されるマイ
クロ波の検波出力は時間とともに減少し、食品が氷点近
辺になった第４周期で最小値となり、一部が解凍し始め
た後は増加傾向を示す。FIG. 6 is a diagram showing the general relationship between the high frequency output and the detection average voltage of the microwave sensor 51 at the time of heating in each cycle on the time axis. The detection output of the microwave radiated intermittently decreases with time, reaches the minimum value in the fourth cycle when the food is near the freezing point, and tends to increase after a part of the food starts to thaw.
【００２５】次に、前述のステップS3において、加熱時
のセンサ出力の最大値を、検出初期であって、しかも複
数周期の平均値のうちから最大値を求める理由について
図７に基づいて説明する。200ｇ以下の軽負荷の食品を
解凍する場合、マイクロ波は短時間で食品に吸収されて
解凍が進む。従って、食品からのマイクロ波反射量の減
少も早く、センサ出力値の傾きが大きくなる。それに対
し、 300ｇ以上の重負荷の解凍は、マイクロ波が食品に
入って解凍が進行するまでにある程度の時間を要する。
つまり、初期でのセンサ出力値の傾きは小さい。その結
果、図７のように１回目又は２回目では軽負荷と重負荷
とを大別できるが、３回〜５回目付近では区別しにくく
なる。Next, in step S3, the reason why the maximum value of the sensor output at the time of heating is determined from the average value of a plurality of cycles at the initial stage of detection will be described with reference to FIG. . When thawing light load foods of 200g or less, microwaves are absorbed into the foods in a short time and thawing proceeds. Therefore, the amount of microwave reflection from the food is reduced quickly, and the slope of the sensor output value becomes large. On the other hand, when thawing with a heavy load of 300 g or more, it takes a certain amount of time for the microwave to enter the food and to proceed with thawing.
That is, the slope of the sensor output value in the initial stage is small. As a result, as shown in FIG. 7, a light load and a heavy load can be roughly classified in the first or second time, but it becomes difficult to distinguish between the third and fifth times.
【００２６】また、軽負荷の食品にマイクロ波を長時間
照射するとスポット等の加熱ムラが発生するため、でき
るだけ早い時点で重量の大別を行い、負荷量に応じた解
凍シーケンスに移行する必要がある。従って、１回目又
は２回目でしきい値と比較することは解凍の仕上がりに
とっても有利である。Further, when a lightly loaded food is irradiated with microwaves for a long period of time, uneven heating such as spots occurs. Therefore, it is necessary to roughly classify the weight at the earliest possible point and shift to a thawing sequence according to the loading amount. is there. Therefore, the comparison with the threshold value at the first time or the second time is also advantageous for the defrosting finish.
【００２７】さらに、多くの食品では検出開始後の第１
周期におけるセンサ出力平均値が最大値となるが、例え
ば、牛ミンチ肉ではごく軽量の 100ｇの場合、第２周期
で最大値となることが実験的に明らかとなっている。従
って、しきい値Ｖref の設定値によっては初期の重量の
大別時にグループ分けを誤ってしまう危険性があるので
正しい最大値を得るために、第１周期と第２周期とのセ
ンサ出力平均値のうち、大きい方を最大値とする。Furthermore, in many foods, the first
It has been experimentally clarified that the average value of the sensor output in the cycle becomes the maximum value, but, for example, when the minced beef is 100 g, which is extremely lightweight, the maximum value becomes the maximum value in the second cycle. Therefore, depending on the set value of the threshold value V ref , there is a risk of erroneous grouping when the initial weight is roughly divided. Therefore, in order to obtain the correct maximum value, the sensor output average of the first cycle and the second cycle is calculated. Of the values, the larger one is the maximum value.
【００２８】[0028]
【発明の効果】以上のように、本発明装置は、マイクロ
波放射源のオン・オフ制御によりマイクロ波を庫内に間
欠的に放射して食品の重量等を検出する構成であるの
で、電源回りを低価格に抑えることができてインバータ
回路等のマイクロ波の出力制御機能を持つ上級機種以外
の出力一定の機種にも適用可能であり、また高出力であ
っても非放射時に食品の温度が均されて加熱ムラが防止
されるという優れた効果を奏する。As described above, the device of the present invention has a structure in which microwaves are intermittently radiated into the refrigerator by the on / off control of the microwave radiation source to detect the weight of food and so on. It can be applied to not only advanced models that have a microwave output control function such as an inverter circuit, etc., but also constant output, even if the output is high, and the temperature of food is not radiated even when the output is high. Has an excellent effect that the unevenness of heating is prevented and uneven heating is prevented.
【００２９】また、本発明装置は、被加熱物の重量によ
り定まる解凍時間を、被加熱物の初期温度又は種類に応
じて修正するので、最適の解凍状態が得られるという優
れた効果を奏する。Further, the apparatus of the present invention corrects the thawing time determined by the weight of the object to be heated according to the initial temperature or the kind of the object to be heated, so that the optimum thawing state can be obtained.
【図１】本発明装置の構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of a device of the present invention.
【図２】食品重量とセンサ出力（最小値）との関係を示
すグラフである。FIG. 2 is a graph showing the relationship between food weight and sensor output (minimum value).
【図３】本発明装置による解凍の手順を示すフローチャ
ートである。FIG. 3 is a flowchart showing a defrosting procedure by the device of the present invention.
【図４】初期温度が異なる冷凍食品の解凍状態の変化を
示すグラフである。FIG. 4 is a graph showing changes in the thawing state of frozen foods having different initial temperatures.
【図５】種類が異なる冷凍食品の解凍状態の変化を示す
グラフである。FIG. 5 is a graph showing changes in the thawing state of frozen foods of different types.
【図６】本発明装置の解凍時における高周波出力と各周
期の加熱時におけるセンサ検波平均電圧との関係を時間
軸上に示した図である。FIG. 6 is a diagram showing, on a time axis, the relationship between the high-frequency output when the device of the present invention is thawed and the sensor-detected average voltage during heating in each cycle.
【図７】同一食品の重量別のセンサ出力とデューティー
運転繰り返し回数との関係を示すグラフである。FIG. 7 is a graph showing the relationship between the sensor output for each weight of the same food and the number of repetitions of duty operation.
１ 食品 ２ 加熱室 ３ ターンテーブル ７ 制御部 ８ 駆動部 ９ マグネトロン発振駆動部 10 マグネトロン 51 マイクロ波センサ 1 Food 2 Heating Room 3 Turntable 7 Control Unit 8 Drive Unit 9 Magnetron Oscillation Drive Unit 10 Magnetron 51 Microwave Sensor
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年８月７日[Submission date] August 7, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１３[Correction target item name] 0013
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１３】[0013]
【実施例】以下、本発明をその実施例を示す図に基づい
て説明する。図１は本発明に係る電子レンジ（以下、本
発明装置という）の構成を示す模式的ブロック図であ
る。図中１は被加熱物である食品、２は食品１を収納す
る加熱室、３は食品１を載せるターンテーブルであっ
て、ターンテーブル３はモータ４により回転されてター
ンテーブル３上の食品１が均一に加熱される。加熱室２
の上壁21には導波口としてのスリット21a が設けられ、
スリット21a を介して加熱室２から漏洩するマイクロ波
は、受信アンテナ及び検波回路からなるマイクロ波セン
サ51で直流検波され、マイクロ波センサ51は検知レベル
に応じた信号を出力する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments. FIG. 1 is a schematic block diagram showing a configuration of a microwave oven according to the present invention (hereinafter, referred to as an apparatus of the present invention). Food figure 1 is a object to be heated, 2 heating chamber for accommodating food 1, 3 is a turntable for placing a food 1, the food 1 on the turntable 3 is a turntable 3 is rotated by the motor 4 Are heated uniformly. Heating chamber 2
The upper wall 21 is provided with a slit 21a as a waveguide port,
The microwave leaking from the heating chamber 2 through the slit 21a is subjected to DC detection by a microwave sensor 51 including a receiving antenna and a detection circuit, and the microwave sensor 51 outputs a signal according to the detection level.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１４[Correction target item name] 0014
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１４】マイクロ波センサ51が出力する検波信号は
増幅部６によって増幅されてマイクロコンピュータから
なる制御部７に入力され、制御部７は入力された検波信
号に応じて、マイクロ波放射源であるマグネトロン10を
オン・オフする駆動部８、及びマグネトロン10を冷却す
る冷却ファン11の動作を制御する。また、制御部７には
食品１の重量、及び解凍初期の温度又は食品１の種類別
に解凍時間，マグネトロン10の駆動制御方法等が定めら
れた解凍プログラムが記憶されている。高圧トランス，
高圧コンデンサ等からなるマグネトロン発振駆動部９
は、駆動部８からのオン・オフ信号に従ってマグネトロ
ン10を発振・停止させて加熱室２内にマイクロ波を間欠
的に放射させる。The detection signal output from the microwave sensor 51 is amplified by the amplification unit 6 and input to the control unit 7 composed of a microcomputer, and the control unit 7 is a microwave radiation source according to the input detection signal. The operation of the drive unit 8 for turning on / off the magnetron 10 and the operation of the cooling fan 11 for cooling the magnetron 10 are controlled. Further, the control unit 7 stores a defrosting program that defines the weight of the food 1, the temperature at the initial stage of the defrosting, the defrosting time for each type of the food 1, the drive control method of the magnetron 10, and the like. High voltage transformer,
Magnetron oscillation drive unit 9 consisting of a high-voltage capacitor, etc.
Causes the magnetron 10 to oscillate / stop in response to an ON / OFF signal from the drive unit 8 to intermittently radiate microwaves into the heating chamber 2.
【手続補正３】[Procedure 3]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図１[Name of item to be corrected] Figure 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 [Figure 1]
───────────────────────────────────────────────────── フロントページの続き (72)発明者 古沢 良一 大阪府守口市京阪本通２丁目18番地 三洋 電機株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoichi Furusawa 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.
Claims (3)
加熱物を解凍する高周波加熱装置において、マイクロ波
を間欠的に放射する手段と、庫内のマイクロ波の一部を
検知して検知レベルに応じた信号を出力する手段と、マ
イクロ波の各放射周期における前記検知レベルのうちの
最小値を検出する手段と、該最小値に基づき被加熱物の
重量を検出する手段と、検出重量に応じた解凍終了時刻
を決定する手段とを備えたことを特徴とする高周波加熱
装置。1. A high-frequency heating device for radiating microwaves into a refrigerator to thaw an object to be heated in the refrigerator, means for intermittently radiating microwaves, and detecting a part of microwaves in the refrigerator. Means for outputting a signal according to the detection level, means for detecting the minimum value of the detection levels in each microwave radiation cycle, and means for detecting the weight of the object to be heated based on the minimum value. A high-frequency heating device, comprising: a means for determining a thawing end time according to the detected weight.
り返されたマイクロ波の間欠的放射の回数に基づいて被
加熱物の種類又は解凍開始時の初期温度を判別する手段
と、検出重量に応じて決定した解凍終了時刻を、被加熱
物の種類又は初期温度に応じて修正する手段とを備えた
請求項１記載の高周波加熱装置。2. A means for determining the type of an object to be heated or an initial temperature at the start of thawing based on the number of times the microwave is intermittently radiated until the detection level reaches a minimum value. The high-frequency heating apparatus according to claim 1, further comprising means for correcting the thawing end time determined according to the type or the initial temperature of the object to be heated.
周期における前記検知レベルのうちの最大値を検出する
手段と、該最大値と、被加熱物を重量別に大別すべく定
めた所定値とを比較する手段と、比較結果に応じて、被
加熱物の重量を検出するためのマイクロ波の間欠放射の
回数を決定する手段とを備えた請求項１又は２記載の高
周波加熱装置。3. A means for detecting a maximum value of the detection levels in a plurality of cycles from the start of intermittent radiation of microwaves, a predetermined value determined to roughly divide the maximum value and the object to be heated by weight. 3. The high-frequency heating device according to claim 1, further comprising: a means for comparing the above and a means for determining the number of times the microwave is intermittently radiated for detecting the weight of the object to be heated according to the comparison result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18619792A JPH062859A (en) | 1992-06-18 | 1992-06-18 | Microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18619792A JPH062859A (en) | 1992-06-18 | 1992-06-18 | Microwave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH062859A true JPH062859A (en) | 1994-01-11 |
Family
ID=16184084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18619792A Pending JPH062859A (en) | 1992-06-18 | 1992-06-18 | Microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH062859A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09250759A (en) * | 1996-02-23 | 1997-09-22 | Samsung Electronics Co Ltd | Controlling method of drive of microwave oven |
-
1992
- 1992-06-18 JP JP18619792A patent/JPH062859A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09250759A (en) * | 1996-02-23 | 1997-09-22 | Samsung Electronics Co Ltd | Controlling method of drive of microwave oven |
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