EP0924964A2 - Mikrowellenherd mit Infrarot Sensor - Google Patents

Mikrowellenherd mit Infrarot Sensor Download PDF

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Publication number
EP0924964A2
EP0924964A2 EP98309204A EP98309204A EP0924964A2 EP 0924964 A2 EP0924964 A2 EP 0924964A2 EP 98309204 A EP98309204 A EP 98309204A EP 98309204 A EP98309204 A EP 98309204A EP 0924964 A2 EP0924964 A2 EP 0924964A2
Authority
EP
European Patent Office
Prior art keywords
sensor
microwave oven
cooking chamber
hole
infrared sensor
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.)
Withdrawn
Application number
EP98309204A
Other languages
English (en)
French (fr)
Other versions
EP0924964A3 (de
Inventor
Sea-Lea Oh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP0924964A2 publication Critical patent/EP0924964A2/de
Publication of EP0924964A3 publication Critical patent/EP0924964A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H05B6/6408—Supports or covers specially adapted for use in microwave heating apparatus
    • H05B6/6411—Supports or covers specially adapted for use in microwave heating apparatus the supports being rotated
    • 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
    • H05B6/6455—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using temperature sensors the sensors being infrared detectors

Definitions

  • the present invention relates to a microwave oven including a cooking chamber and an infrared sensor for sensing the temperature of food during cooking.
  • a microwave oven cooks food by irradiating it with microwaves.
  • a known microwave oven is shown in Figures 1 and 2.
  • a microwave oven comprises a case 1 which is internally divided into a cooking chamber 3 and an electrical component chamber 4 by walls 2.
  • a rotatable tray 5 for supporting food during cooking is located at the bottom of the cooking chamber 3.
  • the rotatable tray 5 is rotated by a driving motor 6 installed at the lower side of the cabinet 2.
  • the electrical component chamber 4 houses a plurality of electric devices including a magnetron 7 and a high voltage transformer 8.
  • Microwaves generated by the magnetron 7 are guided by a waveguide 9 into the cooking chamber 3.
  • the waveguide 9 opens into the cooking chamber 3.
  • a door (not shown) is provided for providing access to the cooking chamber 3 and a controlling section for controlling the microwave oven are installed at the front of the case 1.
  • An infrared sensor assembly 10 is installed centrally at the top of the cooking chamber 3 and is used to detect the temperature of food during cooking.
  • the infrared sensor assembly 10 includes an infrared sensor 11, a printed circuit board 12, on which are mounted a plurality of electronic components (not shown) for producing an electrical signal in dependence on the food temperature sensed by the sensor 11, a cylindrical sensor cover 13, and a casing 14 housing the foregoing elements.
  • the sensor cover 13 encases the infrared sensor 11 and has a hole 13a in its lower end.
  • the sensor cover 13 projects toward the middle of the cooking chamber 3 through a hole defined in the upper wall 2 of the cooking chamber 3.
  • the infrared sensor assembly 10 is positioned centrally at the top of the cooking chamber 3. This means that the field of view of the infrared sensor 11 is limited to the central portion of the rotatable tray 5. Accordingly, if the food to be cooked is placed outside of this limited field of view, the temperature of the food can not be precisely sensed. Also, although the infrared sensor 11 is covered by the sensor cover 13, the infrared sensor 11 is exposed to the humid atmosphere in the cooking chamber 13a through the hole 13a. Accordingly, the operation of the infrared sensor 11 becomes unstable and its temperature measurements unreliable.
  • a microwave oven according to a first aspect of the present invention is characterised in that the sensor is directed obliquely towards a food receiving region of the cooking chamber from a position substantially at the top of the cooking chamber.
  • the senor is located substantially at the front of the cooking chamber and is directed downward and rearwards. Preferably, the sensor is centrally located substantially at the from the cooking chamber.
  • the senor is located outside the cooking chamber and senses food temperature via a hole in a wall of the cooking chamber.
  • the hole is dimensioned such that the sensor has a field of view in the range 4° to 6°. More preferably, the hole is circular and has a diameter in the range 14mm to 25mm.
  • a microwave oven according to a second aspect of the present invention is characterised by a shutter for protecting the sensor.
  • the shutter comprises a substantially planar base having an aperture aligned with the sensor, first and second slidable plates lying plane parallel to the base and having respective apertures therein and drive means for sliding the first and second slidable plates in opposite directions between a closed configuration in which the slidable plates block each others apertures and the aperture of the base, and an open configuration in which all of the apertures are aligned with the sensor.
  • the two aspects of the present invention will be combined in a single microwave oven.
  • a microwave oven comprises a case 50 which is internally divided into a cooking chamber 54 and an electrical component chamber 56 by internal walls 52.
  • a rotatable tray 58 is installed at bottom of the cooking chamber 54.
  • the rotatable tray 58 is rotated by a driving motor 60 installed below the rotatable tray 58.
  • the electrical component chamber 56 houses a plurality of electrical devices induding a magnetron 62, a waveguide 64 and a high voltage transformer.
  • an infrared sensor assembly 100 for detecting the temperature of food during cooking comprises an infrared sensor 110, a printed circuit board 120, a sensor cover 130, a sensor protecting shutter 150 and a casing 140.
  • the printed circuit board 120 supports a plurality of electronic components (not shown) for converting the sensed temperature of the food into an electrical signal and transmitting the signal to a control section.
  • the sensor cover 130 is mounted to the printed circuit board 120 so as to encase the infrared sensor 110 and has a first hole 131 at its lower end.
  • the sensor-protecting shutter 150 selectively opens and closes the first hole in the sensor cover 130.
  • the casing 140 has a second hole 141 aligned with the first hole 131 of the sensor cover 130.
  • the sensor-protecting shutter 150 comprises a base 151, first and second shutter plates 154, 155, an lever 153, a driving motor 152 and a shutter cover 156.
  • the base 151 has a third hole 151a aligned with the first hole 131.
  • the first and second shutter plates 154, 155 overlap each other in front of the base 151.
  • the lever 153 reciprocally moves the first and the second shutter plates 154, 155 in opposite directions.
  • the driving motor 152 drives the lever 153.
  • the driving motor 152 is installed behind the upper part of the base 151 and has a rotary shaft 152a which passes through the base 151 and projects from the front surface of the base 151.
  • the lever 153 is mounted to the rotary shaft 152a.
  • the lever 153 is elastically supported by a torsion spring 153b which tends to rotate it clockwise as viewed in Figure 6.
  • the first and second shutter plates 154, 155 have slits 154a, 155a and guide holes 154b, 155b.
  • Support shafts 153a projecting from respective ends of the lever 153 are inserted into the slits 154a, 155a, and guide protrusions 151b formed on either side of the base 151 are inserted into the guide holes 154b, 155b.
  • the first and second shutter plates 154, 155 are attached with to shutter cover 156 at the front of the assembly.
  • the shutter cover 156 has arc-shape holes into which the free ends of the support shafts 153a are inserted.
  • the infrared sensor assembly 100 is installed centrally in a front, upper portion of the cabinet 52.
  • An observation hole 53 is formed in a wall 52 of the cooking chamber 54 in alignment with the second hole 141 of the casing 140.
  • the infrared sensor assembly 100 is obliquely installed such that an extension of the centerline of the infrared sensor 110 and the observation hole 53 will pass through the middle of the rotatable tray 58.
  • the observation hole 53 has such a diameter that the infrared sensor 110 has a field of view (a) of 4° ⁇ 6°, and more preferably 5°.
  • the diameter of the observation hole 53 ranges from 14mm to 25mm.
  • the infrared sensor 110 detects the temperature of the food positioned within the above field of view through the observation hole 53 during cooking. Even when the food is not centrally on the rotatable tray 58, its temperature can be accurately determined.
  • the sensor-protecting shutter 150 opens the first hole 131 of the sensor cover 130 only when it is required to detect the temperature of the food.
  • the sensor-protecting shutter 150 does not operate without power from the driving motor 152. Accordingly, the first and second shutter plates 154, 155 co-operate with each other so as to close the third hole 151a of the base 151.
  • the driving motor 152 When electric power is applied to the driving motor 152, the rotary shaft 152a of the driving motor 152 rotates, rotating the lever 153 anticlockwise. Consequently, the first and second shutter plates 154 and 155 are moved by the support shafts 153a of the lever 153 in opposite directions.
  • the first and second shutter plates 154, 155 move longitudinally along the base 151, guided by the guide protrusions 151b.
  • the third hole 151a is opened and, accordingly, the first hole 131 of the sensor cover 130 is opened. Consequently, the infrared sensor 110 detects the temperature of the food in the cooking chamber 54 through the third hole 151a of the base 151 and the observation hole 53.
  • Figure 7B shows the third hole 151a in its open state.
  • the lever 153 When the electric power is cut-off, the lever 153 is rotated clockwise by the restoring force of the torsion spring 153b which was tensioned by the rotation of the lever 153. By the rotation of the lever 153, the first and second shutter plates 154, 155 move in opposite directions so as to close the third hole 151a of the base 151, as shown in Figure 7A. Accordingly, the first hole 131 of the sensor cover 130 is closed.
  • the sensor-protecting shutter 150 opens the first hole 131 of the sensor cover 130 only when the infrared sensor 110 needs to detect the temperature of food, the negative factors of the cooking chamber such as humidity, microwaves etc. affect the infrared sensor 110 less.
  • a microwave oven embodying all aspects of the present invention has the advantages of accurate temperature detection even when food not centrally placed on the rotating tray and protection of the sensor by means of the shutter. It should be noted that the aspects of the present invention need not both be embodied in a microwave oven.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Radiation Pyrometers (AREA)
EP98309204A 1997-12-22 1998-11-10 Mikrowellenherd mit Infrarot Sensor Withdrawn EP0924964A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR19970071944 1997-12-22
KR9771944 1997-12-22

Publications (2)

Publication Number Publication Date
EP0924964A2 true EP0924964A2 (de) 1999-06-23
EP0924964A3 EP0924964A3 (de) 2000-04-12

Family

ID=19528170

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98309204A Withdrawn EP0924964A3 (de) 1997-12-22 1998-11-10 Mikrowellenherd mit Infrarot Sensor

Country Status (4)

Country Link
EP (1) EP0924964A3 (de)
JP (1) JPH11193930A (de)
KR (1) KR19990062452A (de)
CN (1) CN1221093A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011080223A3 (en) * 2009-12-31 2011-10-06 Arcelik Anonim Sirketi A cooking device
CN107397444A (zh) * 2016-05-18 2017-11-28 佛山市顺德区美的电热电器制造有限公司 煲盖和烹饪锅具
WO2020229452A1 (de) 2019-05-13 2020-11-19 BSH Hausgeräte GmbH Gargerät mit ausserhalb des garraums angeordneten sensoreinheiten
DE102021200669A1 (de) 2021-01-26 2022-07-28 BSH Hausgeräte GmbH Haushalts-Gargerät mit motorisch längsverschieblichem Sensor

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009168462A (ja) * 2008-01-10 2009-07-30 Toyota Central R&D Labs Inc マイクロ波加熱用温度分布測定装置およびマイクロ波加熱用温度分布測定方法
JP2009236888A (ja) * 2008-03-28 2009-10-15 Toyota Central R&D Labs Inc マイクロ波加熱用温度分布測定装置およびマイクロ波加熱用温度分布測定方法
CN102028414B (zh) * 2009-09-28 2014-07-30 深圳市繁兴科技有限公司 一种空间分隔装置及应用其的烹饪设备
US10079982B2 (en) 2011-06-10 2018-09-18 Flir Systems, Inc. Determination of an absolute radiometric value using blocked infrared sensors
CN103907342B (zh) * 2011-10-07 2018-10-23 菲力尔系统公司 利用阻隔红外传感器确定绝对辐射值的方法和装置
CN108731036B (zh) * 2017-04-20 2019-09-03 珠海格力电器股份有限公司 厨用电器
CN108826380A (zh) * 2018-05-09 2018-11-16 海尔优家智能科技（北京）有限公司 一种微波炉测温装置、方法与微波炉
CN111102615A (zh) * 2018-10-26 2020-05-05 博西华电器（江苏）有限公司 用于油烟机的控制方法及油烟机控制系统
DE102019213485A1 (de) * 2019-09-05 2021-03-11 BSH Hausgeräte GmbH Haushalts-Mikrowellengerät mit Mikrowellendom
CN112874499A (zh) * 2021-01-15 2021-06-01 合肥青冠机电科技有限公司 一种制动器监测系统
CN114167758B (zh) * 2021-11-22 2024-02-23 珠海格力电器股份有限公司 烹饪设备、烹饪设备控制方法和存储介质

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5261848A (en) * 1975-11-17 1977-05-21 Matsushita Electric Ind Co Ltd High frequency heater
JPS5813816B2 (ja) * 1977-07-15 1983-03-16 松下電器産業株式会社 高周波加熱装置
JPS5759850Y2 (de) * 1978-07-13 1982-12-21
DE3069395D1 (en) * 1979-03-02 1984-11-15 Matsushita Electric Industrial Co Ltd Heat-cooking apparatus incorporating infrared detecting system
GB2062428B (en) * 1979-10-31 1983-06-02 Tokyo Shibaura Electric Co Microwave oven
JPS58220385A (ja) * 1982-06-16 1983-12-21 三洋電機株式会社 電子制御式調理器
DE69608500T2 (de) * 1995-07-07 2001-01-18 Lg Electronics Inc., Seoul/Soul Einrichtung zur Vermeidung der Fehlfunktion des Sensors in Mikrowellenöfen
SE505555C2 (sv) * 1995-12-21 1997-09-15 Whirlpool Europ Förfarande för styrning av ett uppvärmningsförlopp i en mikrovågsugn samt mikrovågsugn

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011080223A3 (en) * 2009-12-31 2011-10-06 Arcelik Anonim Sirketi A cooking device
CN107397444A (zh) * 2016-05-18 2017-11-28 佛山市顺德区美的电热电器制造有限公司 煲盖和烹饪锅具
CN107397444B (zh) * 2016-05-18 2023-09-01 佛山市顺德区美的电热电器制造有限公司 煲盖和烹饪锅具
WO2020229452A1 (de) 2019-05-13 2020-11-19 BSH Hausgeräte GmbH Gargerät mit ausserhalb des garraums angeordneten sensoreinheiten
US12207377B2 (en) 2019-05-13 2025-01-21 BSH Hausgeräte GmbH Cooking appliance having sensor units arranged outside the cooking chamber
DE102021200669A1 (de) 2021-01-26 2022-07-28 BSH Hausgeräte GmbH Haushalts-Gargerät mit motorisch längsverschieblichem Sensor
WO2022161777A1 (de) 2021-01-26 2022-08-04 BSH Hausgeräte GmbH Haushalts-gargerät mit motorisch längsverschieblichem sensor
EP4380313A2 (de) 2021-01-26 2024-06-05 BSH Hausgeräte GmbH Haushalts-gargerät mit motorisch längsverschieblichem sensor

Also Published As

Publication number Publication date
KR19990062452A (ko) 1999-07-26
CN1221093A (zh) 1999-06-30
EP0924964A3 (de) 2000-04-12
JPH11193930A (ja) 1999-07-21

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