EP0517433B1 - Heizapparat - Google Patents

Heizapparat Download PDF

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Publication number
EP0517433B1
EP0517433B1 EP92304878A EP92304878A EP0517433B1 EP 0517433 B1 EP0517433 B1 EP 0517433B1 EP 92304878 A EP92304878 A EP 92304878A EP 92304878 A EP92304878 A EP 92304878A EP 0517433 B1 EP0517433 B1 EP 0517433B1
Authority
EP
European Patent Office
Prior art keywords
electrical signal
ambient temperature
correction factor
gas sensor
level
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
Application number
EP92304878A
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English (en)
French (fr)
Other versions
EP0517433A1 (de
Inventor
Nobuichi Nagoya Works K.K. Toshiba Nishimura
Hiromi Nagoya Works K.K. Toshiba Kaneko
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Toshiba Corp
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Toshiba Corp
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Publication date
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Publication of EP0517433A1 publication Critical patent/EP0517433A1/de
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Publication of EP0517433B1 publication Critical patent/EP0517433B1/de
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H05B6/6458—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using humidity or vapor sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/02—Stoves or ranges heated by electric energy using microwaves
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H05B6/645—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using temperature sensors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control

Definitions

  • This invention relates to a heating apparatus, such as microwave ovens, wherein the heating operation is executed based on the density of water vapor and the like emanating from food contained in a cooking chamber.
  • An output of a magnetron is adjusted based on the density of a gas such as water vapor emanating from the food to be cooked, in a microwave oven with an automatic cooking function, for example.
  • a gas sensor is provided in an exhaust passage for exhausting the gas from the cooking chamber. The gas density is sensed based on an electrical signal produced by the gas sensor. JP-A-62-218734 discloses such an arrangement.
  • the sensitivity to alcohol is set to a relatively small value so that the gas sensor is prevented from influences of the alcohol emanating from the food. Rather, its resistance value is varied with the change of the relative humidity due to the water vapor emanating from the food and further depends upon the humidity. Accordingly, the drive of the magnetron is interrupted when a level-change ratio of the signal generated by the gas sensor, that is, the ratio of the level-change of the signal from the gas sensor at the present time to that at the time of start of the heating operation, reaches a predetermined value. Alternatively, the magnetron is driven for a set period of time thereafter. Thus, the heating operation for the food is automatically executed.
  • the changes in the relative humidity due to the water vapor and the like emanating from the food are influenced both by the relative humidity in an environment where the microwave oven is disposed and by the ambient temperature in the environment, during the heating operation. Consequently, an apparent sensitivity of the gas sensor varies depending upon the circumstances. More specifically, it is humid in the cooking chamber at the time of start of the heating operation under circumstances wherein the ambient temperature is high and the humidity is high such as in the rainy spell in early summer in Japan. Even when the water vapor emanates from the food being cooked with progress of the heating, the degree of change in the density of water vapor is small in the cooking chamber since both of the temperature and the humidity are high. Therefore, the sensitivity of the gas sensor apparently becomes lower and accordingly, the cooking period is lengthened more than a suitable period, resulting in an excessive heating.
  • the apparent sensitivity of the gas sensor changes depending upon the ambient temperature and the relative humidity at the time when the heating operation is initiated. Accordingly, the heating completion time varies in a range between times t a and t b in FIG. 14 under the influence of the ambient temperature and the relative humidity in the arrangement that the timing of completion of the heating operation is determined based on the level-change rate of the electrical signal from the gas sensor, resulting in a problem that the heating cannot be stably performed.
  • the density of water vapor emanating from the food differs depending upon the weight of the food even when neither of the ambient temperature nor the relative humidity changes. Consequently, the finishing of the food differs from case to case depending upon the weight of the food.
  • an object of the present invention is to provide a heating apparatus wherein the heating can be automatically executed based on the level-change ratio of the electrical signal generated by the gas sensor without any influence of the ambient temperature and the relative humidity in the circumstances and without any influence of the weight of the food to be cooked.
  • the present invention provides a heating apparatus comprising a cooking chamber, heating means provided in the cooking chamber for heating food contained therein, a gas sensor sensitive to the density of water vapor and the like emanating from the food for generating an electrical signal corresponding to the density of water vapor and the like, and control means for controlling an output of the heating means based on a level of the electrical signal generated by the gas sensor, characterized by a temperature sensor responsive to a room ambient temperature for generating an electrical signal corresponding to the room ambient temperature, storage means for storing data of a correction factor calculating equation in which the room ambient temperature is set as variable, the correction factor calculating equation being for correcting the level of the electrical signal generated by the gas sensor so that the same becomes equal to a level of the electrical signal to be generated by the gas sensor during the heating operation under the conditions of a reference room ambient temperature, calculation means for calculating a correction factor by means of the correction factor calculating equation whose data is stored in the storage means, based on the electrical signal from the temperature sensor, when the cooking operation is initiated,
  • the invention provides a heating apparatus comprising a cooking chamber, heating means provided in the cooking chamber for heating food contained therein, a gas sensor sensitive to the density of water vapor and the like emanating from the food for generating an electrical signal corresponding to the density of water vapor and the like, and control means for controlling an output of the heating means based on a level of the electrical signal generated by the gas sensor, characterized by a temperature sensor responsive to a room ambient temperature for generating an electrical signal corresponding to the room ambient temperature, a weight sensor sensitive to the weight of the food contained in the cooking chamber for generating an electrical signal in accordance with the weight of the food, storage means for storing data of a plurality of correction factor calculating equations in each of which the ambient temperature is set as variable, the equations corresponding to different values of the weight of the food, the correction factor calculating equation being for correcting the level of the electrical signal generated by the gas sensor so that the same becomes equal to a level of the electrical signal to be generated by the gas sensor during the heating operation under the conditions of a
  • FIG. 1 showing an electrical arrangement of the microwave oven
  • the microwave oven has a cooking chamber 1 defined therein and a turntable 2 is rotatably mounted in the cooking chamber 1.
  • a magnetron 3 serving as heating means and an oven thermistor 4 serving as a temperature sensor are provided so as to face the interior of the cooking chamber 1.
  • the cooking chamber 1 is provided with an exhaust passage 5 in which a gas sensor 6 is mounted.
  • the gas sensor 6 is provided for sensing the density of water vapor and the like exhausted through the exhaust passage 5 from the cooking chamber 1, thereby generating an electrical signal V s in accordance with the sensed density of water vapor and the like.
  • a primary winding of a high voltage transformer 7 is connected through a DC relay 8 to an AC power supply 9.
  • a secondary winding of the transformer 7 is connected to the magnetron 3.
  • Microcomputer-based control means 10 operates to display a set cooking menu or cooking condition on a display 12 and executes the heating operation in accordance with the contents set when a start key 11 is turned on.
  • the control means 10 is provided with a random access memory (RAM) 10a and a read only memory (ROM) 10b. Data of a correction factor calculating equation having a temperature value as variable is stored in ROM 10b. This correction factor calculating equation is used for correcting the level of the electrical signal V s generated by the gas sensor 6, as will be described in detail later.
  • step S2 the control means 10 advances from step S1 to step S2 in which the electrical signal V s0 from the gas sensor 6 is input. Data of the level of the input signal V s0 is stored in RAM 10a (step S3).
  • the control means 10 then operates to detect the ambient temperature or the room temperature based on a temperature signal from the thermistor 4 (step S4). More specifically, the atmospheric temperature in the cooking chamber 1 is equal to the ambient temperature when the heating has not been executed long. Accordingly, the atmospheric temperature in the cooking chamber 1 can be regarded as equal to the ambient temperature.
  • control means 10 inputs the data of the correction factor calculating equation from ROM 10b (step S5) and operates to calculate a correction factor for correcting the output of the gas sensor 6 by substituting the value of the sensed ambient temperature in the correction factor calculating equation (step S6).
  • FIG. 3 shows the relations between the level-change ratio of the signal V s from the gas sensor 6 and the heating time period in the circumstances where the ambient temperature and the relative humidity differ from case to case.
  • the curve R1(t) designates the characteristic of the level-change ratio ⁇ V of the signal V s in the condition that the ambient temperature is 5°C and the relative humidity is 50%
  • the curve R2(t) the characteristic of the level-change ratio ⁇ V of the signal V s in the condition that the ambient temperature is 25°C and the relative humidity is 70%
  • the curve R3(t) the level-change ratio ⁇ V of the signal V s in the condition that the ambient temperature is 35°C and the relative humidity is 70%.
  • the apparent sensitivity of the gas sensor 6 is reduced as the ambient temperature rises.
  • FIG. 3 shows that each of the rates of the respective level-change ratios shown by R1(t), R2(t) and R3(t) in a predetermined heating time period is approximately constant over the whole heating time period. Accordingly, the level-change ratios in the different conditions can correspond to the level-change ratio in the reference condition by multiplying the level-change ratio ⁇ V with regard to the predetermined ambient temperature and relative humidity by a predetermined correction factor (ratio).
  • K1 is a correction factor for converting R1(t) to R2(t)
  • K2 is a correction factor for converting R3(t) to R2(t).
  • the correction factor K1 is a ratio between R1(t) and R2(t)
  • the correction factor K2 is a ratio between R3(t) and R2(t).
  • a level-change ratio ⁇ V11 is obtained from the above-mentioned equation.
  • R1(t) is multiplied by the ratio, ⁇ V21/ ⁇ V11 (see FIG. 4).
  • ⁇ V21/ ⁇ V11 is the correction factor K1(T) at time t1.
  • FIG. 5 shows a characteristic curve of the correction factor K(T) obtained with the ambient temperature as variable as described above.
  • the level-change ratio ⁇ V of the signal V s needs to be corrected to a larger extent as the ambient temperature deviates farther from the reference temperature.
  • the control means 10 operates to turn on the DC relay 8 when the correction factor K(T) is obtained based on the ambient temperature (step S7).
  • a high AC voltage is then applied to the magnetron 3 and high frequency waves are delivered from the magnetron 3 to the food, thereby heating the same.
  • the control means 10 inputs the data of the electrical signal V s from the gas sensor 6 (step S8) and compares the signal V s with the electrical signal V s0 whose data is stored in RAM 10a, thereby calculating the level-change ratio ⁇ V (step S9).
  • the control means 10 then operates to correct the level-change ratio ⁇ V of the signal V s by multiplying the rate by the correction factor K(T) (step S10).
  • the control means 10 then operates to determine whether or not the corrected level-change ratio ⁇ V has reached the predetermined value (step S11). When determining that the corrected level-change ratio ⁇ V has reached the predetermined value, the control means 10 advances to step S12 where the DC relay 8 is turned off. As a result, the magnetron 3 is deenergized, thereby completing the heating operation.
  • FIG. 6 shows the level-change ratio ⁇ V of the signal V s from the gas sensor 6 in the cases where the ambient temperature is high and low and the correction has been made and has not been made when boiled rice is reheated.
  • FIG. 7 shows the level-change ratio ⁇ V of the signal V s in the cases where the ambient temperature is high and low and the correction has been made and not been made when Japanese "miso" soup is reheated.
  • the level-change ratio ⁇ V can be corrected into an approximately constant value as the result of correction by means of the correction factor K(T) regardless of the ambient temperature.
  • the level-change ratio ⁇ V of the signal V s generated by the gas sensor 6 is corrected according to the ambient temperature so as to correspond to the reference level-change ratio ⁇ V of the signal V s generated by the gas sensor 6 at the ambient temperature of 25°C.
  • the heating by means of the magnetron can be completed at desired timing without any influence of the ambient temperature in the foregoing embodiment of the invention.
  • FIGS. 8 to 13 illustrate a second embodiment of the invention.
  • the identical parts are labeled by the same reference numerals as in the foregoing embodiment.
  • a weight sensor 13 is provided for measuring the weight of the food placed on the turntable 2 of the microwave oven.
  • the weight sensor 13 senses the weight of the food and generates a corresponding weight signal, which signal is supplied to the control means 10.
  • the control means 10 operates to calculate the correction factor K(T) for the level-change ratio ⁇ V of the signal V s from the gas sensor 6 based on the ambient temperature at the time of start of the heating operation in the same manner as in the foregoing embodiment.
  • the correction factor K(T) is finally determined based on the weight of the food sensed by the weight sensor 13. More specifically, FIG.
  • FIG. 9 shows the various values of the signal V s from the gas sensor 6 in the different conditions that the values of the ambient temperatures and the weight of the food differ from one another, as is obvious from FIG. 9.
  • the density of the water vapor emanating from the food takes different values depending upon the different values of the weight of the food. Accordingly, the weight of the food changes the time-dependent characteristics of the signal V s even when the ambient temperature does not change. Consequently, the level-change ratio ⁇ V of the signal V s varies depending upon the weight of the food, as shown in FIG. 10.
  • the correction factor K(T) is so set as to take different values in accordance with different values of the food's weight.
  • the control means 10 detects the value of weight of the food based on the weight signal from the weight sensor 13 when the start key 11 is turned on.
  • the weight of a bowl of rice to be heated is smaller than the predetermined weight and the total weight of three bowls of rice is larger than the predetermined weight.
  • FIG. 12 shows the level-change ratios ⁇ V of the signal V s from the gas sensor 6 in the cases where the ambient temperature is high and low and the correction has been made and has not been made when a bowl of rice is reheated.
  • FIG. 13 shows the level-change ratios ⁇ V of the signal V s in the cases where the ambient temperature is high and low and the correction has been made and not been made when three bowls of rice is reheated.
  • the apparent sensitivity of the gas sensor 6 can be prevented from being varied in accordance with the weight of the food to be heated.
  • the level-change ratio ⁇ V of the signal from the gas sensor 6 is corrected based on the weight of the food as well as based on the ambient temperature. Consequently, the heating operation can be completed at a suitable timing irrespective of the weight of the food.
  • an independent temperature sensor may be provided for sensing the ambient temperature.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Claims (4)

  1. Heizapparat, mit einer Kochkammer (1), einem Heizmittel (3), das in der Kochkammer (1) vorgesehen ist, zum Erhitzen von darin enthaltenen Nahrungsmitteln, einem Gasfühler (6), der auf die Dichte von aus den Nahrungsmitteln und dergleichen austretendem Wasserdampf empfindlich ist, zum Erzeugen eines elektrischen Signals, das der Dichte des Wasserdampfes und dergleichen entspricht, und einem Steuermittel (10) zum Steuern der Ausgangsleistung des Heizmittels (3) aufgrund des Pegels des von dem Gasfühler (6) erzeugten elektrischen Signals, gekennzeichnet durch einen auf die Raum-Umgebungstemperatur ansprechenden Temperaturfühler (4) zum Erzeugen eines der Raum-Umgebungstemperatur entsprechenden, elektrischen Signals, ein Speichermittel (10b) zum Speichern der Daten einer Korrekturfaktor-Berechnungsgleichung, bei der die Raum-Umgebungstemperatur als Variable vorgegeben ist, wobei die Korrekturfaktor-Berechnungsgleichung dazu bestimmt ist, den Pegel des von dem Gasfühler (6) erzeugten elektrischen Signals so zu korrigieren, daß dieser Pegel mit dem Pegel des elektrischen Signals übereinstimmt, das von dem Gasfühler (6) während des Heizvorgangs unter den Bedingungen einer Bezugs-Raumumgebungstemperatur erzeugt wird, ein Berechnungsmittel (10) zum Berechnen eines Korrekturfaktors mittels der Korrekturfaktor-Berechnungsgleichung, deren Daten in dem Speichermittel (10b) gespeichert sind, aufgrund des elektrischen Signals von dem Temperaturfühler (4), wenn der Kochvorgang eingeleitet wird, und ein Korrekturmittel (10), das den Pegel des elektrischen Signals von dem Gasfühler (6) mit dem von dem Berechnungsmittel (10) ermittelten Korrekturfaktor multipliziert, wodurch das Ergebnis der Multiplikation auf das Steuermittel (10) gegeben wird.
  2. Heizapparat, mit einer Kochkammer (1), einem Heizmittel (3), das in der Kochkammer (1) vorgesehen ist, zum Erhitzen von darin enthaltenen Nahrungsmitteln, einem Gasfühler (6), der auf die Dichte von aus den Nahrungsmitteln und dergleichen austretendem Wasserdampf empfindlich ist, zum Erzeugen eines elektrischen Signals, das der Dichte des Wasserdampfes und dergleichen entspricht, und einem Steuermittel (10) zum Steuern der Ausgangsleistung des Heizmittels (3) aufgrund des Pegels des von dem Gasfühler (6) erzeugten elektrischen Signals, gekennzeichnet durch einen auf die Raum-Umgebungstemperatur ansprechenden Temperaturfühler (4) zum Erzeugen eines der Raum-Umgebungstemperatur entsprechenden, elektrischen Signals, einen Gewichtsfühler (13), der empfindlich auf das Gewicht der in der Kochkammer (1) enthaltenen Nahrungsmittel ist, zum Erzeugen eines dem Gewicht der Nahrungsmittel entsprechenden, elektrischen Signals, ein Speichermittel (10b) zum Speichern von Daten einer Vielzahl von Korrekturfaktor-Berechnungsgleichungen, bei denen in jeder die Raum-Umgebungstemperatur als Variable vorgegeben ist, wobei die Gleichungen verschiedenen Werten des Gewichtes der Nahrungsmittel entsprechen, und die Korrekturfaktor-Berechnungsgleichung dazu bestimmt ist, den Pegel des von dem Gasfühler (6) erzeugten elektrischen Signals so zu korrigieren, daß dieser Pegel mit dem Pegel des elektrischen Signals übereinstimmt, das von dem Gasfühler (6) während des Heizvorgangs unter den Bedingungen einer Bezugs-Raumumgebungstemperatur erzeugt wird, ein Berechnungsmittel (10), das aufgrund des elektrischen Signals von dem Gewichtsfühler (13) eine der Korrekturfaktor-Berechnungsgleichungen, die dem Gewicht der Nahrungsmittel entspricht, aus dem Speichermittel (10b) auswählt, wenn der Heizvorgang eingeleitet wird, wobei das Berechnungsmittel (10) mittels der Korrekturfaktor-Berechnungsgleichung, deren Daten in dem Speichermittel (10b) gespeichert sind, einen Korrekturfaktor berechnet aufgrund des elektrischen Signals von dem Temperaturfühler (4), wenn der Kochvorgang eingeleitet wird, und ein Korrekturmittel (10), das den Pegel des elektrischen Signals von dem Gasfühler (6) mit dem von dem Berechnungsmittel (10) ermittelten Korrekturfaktor multipliziert, wodurch das Ergebnis der Multiplikation auf das Steuermittel (10) gegeben wird.
  3. Heizapparat gemäß Anspruch 1, dadurch gekennzeichnet, daß ein Temperaturfühler, der zum Fühlen der atmosphärischen Temperatur in der Kochkammer (1) vorgesehen ist, auch als der Raum-Umgebungstemperaturfühler (4) verwendet wird.
  4. Heizapparat gemäß Anspruch 2, dadurch gekennzeichnet, daß ein Temperaturfühler, der zum Fühlen der atmosphärischen Temperatur in der Kochkammer (1) vorgesehen ist, auch als der Raum-Umgebungstemperaturfühler (4) verwendet wird.
EP92304878A 1991-05-28 1992-05-28 Heizapparat Expired - Lifetime EP0517433B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP123377/91 1991-05-28
JP3123377A JP2996766B2 (ja) 1991-05-28 1991-05-28 加熱調理装置

Publications (2)

Publication Number Publication Date
EP0517433A1 EP0517433A1 (de) 1992-12-09
EP0517433B1 true EP0517433B1 (de) 1994-09-21

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EP92304878A Expired - Lifetime EP0517433B1 (de) 1991-05-28 1992-05-28 Heizapparat

Country Status (4)

Country Link
EP (1) EP0517433B1 (de)
JP (1) JP2996766B2 (de)
KR (1) KR960001679B1 (de)
DE (1) DE69200434T2 (de)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP1300079A2 (de) 2001-10-06 2003-04-09 Maschinenfabrik Kurt Neubauer GmbH & Co Gargerät mit Feuchtemesseinrichtung und Verfahren zur Feuchtemessung in einem Gargerät

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FR2773872B1 (fr) * 1998-01-22 2000-03-31 Sgs Thomson Microelectronics Procede de commande d'un four electrique et dispositif pour sa mise en oeuvre
KR20050000653A (ko) 2003-06-24 2005-01-06 엘지.필립스 엘시디 주식회사 액정 표시 패널
CN104728882B (zh) * 2015-03-05 2017-01-11 广东美的厨房电器制造有限公司 微波炉及其烹饪控制方法
WO2016205569A1 (en) * 2015-06-16 2016-12-22 De Luca Oven Technologies, Llc A high-wattage power appliance system
EP3784004B1 (de) 2019-08-19 2023-06-07 Meam Cor Bv Mikrowellenapplikatorsteuerung

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US4133995A (en) * 1977-08-30 1979-01-09 Litton Systems, Inc. Method of fire detection in a microwave oven
US4162381A (en) * 1977-08-30 1979-07-24 Litton Systems, Inc. Microwave oven sensing system
JPS55100683A (en) * 1979-01-25 1980-07-31 Sharp Kk Cooking device
CA1190604A (en) * 1981-07-21 1985-07-16 Takeshi Tanabe Combined microwave oven and grill oven with automated cooking performance
JPS5880426A (ja) * 1981-11-06 1983-05-14 Matsushita Electric Ind Co Ltd 高周波加熱装置
CA1253592A (en) * 1985-02-15 1989-05-02 Tatsuya Tsuda Heating apparatus with humidity sensor

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Title
JP-A-62-218734 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1300079A2 (de) 2001-10-06 2003-04-09 Maschinenfabrik Kurt Neubauer GmbH & Co Gargerät mit Feuchtemesseinrichtung und Verfahren zur Feuchtemessung in einem Gargerät

Also Published As

Publication number Publication date
KR920021937A (ko) 1992-12-19
JPH04350422A (ja) 1992-12-04
DE69200434D1 (de) 1994-10-27
DE69200434T2 (de) 1995-05-04
JP2996766B2 (ja) 2000-01-11
EP0517433A1 (de) 1992-12-09
KR960001679B1 (ko) 1996-02-03

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