EP0436486B1 - Microwave oven's door opening and closing detection apparatus using photo-detecting sensor - Google Patents

Microwave oven's door opening and closing detection apparatus using photo-detecting sensor Download PDF

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Publication number
EP0436486B1
EP0436486B1 EP19910100007 EP91100007A EP0436486B1 EP 0436486 B1 EP0436486 B1 EP 0436486B1 EP 19910100007 EP19910100007 EP 19910100007 EP 91100007 A EP91100007 A EP 91100007A EP 0436486 B1 EP0436486 B1 EP 0436486B1
Authority
EP
European Patent Office
Prior art keywords
door
photo
microwave oven
detecting sensor
microprocessor
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
EP19910100007
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0436486A1 (en
Inventor
Joon Ku Lee
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 EP0436486A1 publication Critical patent/EP0436486A1/en
Application granted granted Critical
Publication of EP0436486B1 publication Critical patent/EP0436486B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B6/6414—Aspects relating to the door of the microwave heating apparatus
    • H05B6/6417—Door interlocks of the microwave heating apparatus and related circuits

Definitions

  • the invention relates to an apparatus for detecting whether microwave oven's door is open or closed, particularly to an apparatus for detecting a defect of a mechanical switch and starts from the US-A-4,638,137.
  • the conventional microwave oven uses a mechanical switch so that the range or oven operates only when its door is completely closed and microwaves do not leak.
  • US-A-4,511,780 discloses a switch operating assembly for a microwave heating apparatus having a locking mechanism.
  • the locking mechanism includes a sliding member which moves to turn on a microswitch for controlling the operation of the magnetron and which slides automatically to turn off the microswitch when the door is opened.
  • US-A-4,504,719 discloses a latch and switch arrangement for use with a microwave oven, which assures that the door of the microwave oven is tightly closed and the latch on the door properly actuates and deactuates a mechanical switch for controlling the operation of the magnetron.
  • the microwave oven may operate with its door not completely closed, so that it is possible that microwaves leak.
  • US-A-4,638,137 discloses an apparatus in which opening and closing of the microwave oven's door is detected by a microprocessor which controls operation of the microwave oven according to the detected state to prevent leakage of microwaves.
  • the cooking time is input through keyboard, and, if the microwave oven's door is closed, a door key gives a pushing force to one part of a slide plate.
  • a stop plate which is an integral part of a cooking start button prevents the slide plate from moving. However, if the cooking start button is pushed, the stop plate moves forward, so that the slide plate moves in the door key pushing direction and a heat start switch is closed.
  • a switch connecting primary winding of a transformer to a power line is closed, and another switch moving together with said switch is closed, so that a signal informing that the heat start switch is closed is sent to a microprocessor.
  • the microprocessor having received said signal energizes relay windings via a converter, such that a relay switch is closed and the primary winding of the transformer is connected with the power line. Therefore, power is applied to the primary winding through a switch moving together with the door, that is to say, when door is closed it is closed and when door is open it is open, thereby a magnetron operates and microwaves are generated.
  • a microprocessor understands opening and closing of the door through the mechanical switch which detects the state of the door and sends a signal corresponding to the state of door to the microprocessor, when the mechanical switch malfunctions, it is possible for the microprocessor to misunderstand the state of door.
  • the invention resides in an apparatus of the kind referred to in claim 1.
  • Fig. 1 shows a microwave oven's door opening and closing detecting apparatus in which a photo-detecting sensor is mounted according to the invention.
  • Fig. 2 shows a flow chart showing method of the invention which controls operation of the microwave oven according to state of its door by using a photo-detecting sensor.
  • Fig. 1 represents a schematic view showing an essential part of the apparatus according to the invention.
  • a door 1 is hinged to the main body of a microwave oven.
  • a door hook 2 is attached to the door 1.
  • the door hook 2 can be moved into the inside of a latch apparatus B-B′ through an opening provided in the latch apparatus B-B′.
  • An elastic end of an operating plate 4 is fixed to the latch apparatus B-B′ and the other end of the operating plate not fixed to the latch apparatus B-B′ is forced to move by the door hook 2, so that a first microswitch 10 is turned on. Because the first microswitch 10 connects power to the primary winding of a transformer, when the door hook 2 pushes the operating plate 4 with the door 1 closed the transformer is connected to power.
  • the distorted end of the door hook 2 pushes downward a lever 5 with the door hook 2 gone into the inside of the latch apparatus.
  • the second microswitch 20 connected to the microprocessor is turned on.
  • a photo-detecting sensor 30 is mounted in front of the second microswitch 20.
  • the photo-detecting sensor 30 comprises a light emitting element and a light receiving element.
  • the photo-detecting sensor 30 is electrically connected to the microprocessor.
  • the lever 5 When the lever 5 is inserted into the photo-detecting sensor 30, it sends an "off"-signal to the microprocessor, and, when the lever 5 is not inserted into the photo-detecting sensor 30, it sends an "on"-signal to the microprocessor.
  • Fig. 2 is a flow chart showing the operation of the microprocessor according to the invention.
  • the microprocessor When power is applied to the microwave oven according to the invention, the microprocessor is ready to detect the state of the door (processing block 100).
  • the door hook 2 When the door hook 2 is inserted into the inside of the latch apparatus B-B′, not only the end of the door hook 2 pushes the operating plate 4 in the direction of advancing the door hook 2 but also the distorted end of the door hook 2 pushes downward the lever 5.
  • the second microswitch 20 is turned on with the lever 5 pushed downward.
  • the first microswitch 10 is interposed between the primary winding of the transformer and the power line.
  • the first microswitch 10 When the operating plate 4 is pushed with the door 1 closed, the first microswitch 10 is turned on and, therefore, it connects the primary winding of the transformer to the power line.
  • the second microswitch 20 is connected to the microprocessor.
  • an "on" signal is sent to the microprocessor, so that the microprocessor decides that door 1 is normally closed (processing block 200).
  • the microprocessor inquires whether or not the photo-detecting sensor 30 is turned on and decides the state of the photo-detecting sensor 30 at processing block 300. That is to say, when the lever 5 is inserted into the photo-detecting sensor 30, it sends an "off” signal to the microprocessor and when the lever 5 is not inserted into the photo-detecting sensor 30, it sends an "on” signal to the microprocessor. Therefore, the microprocessor decides the state of the door 1 once more.
  • the magnetron is driven during a period of time set by means of the keyboard (not shown), so that the microwave oven cooks food in its cooking chamber (processing block 800).
  • the microprocessor displays an error on a display board (processing block 400), and it performs the next operation (processing block 700).
  • the position of the photo-detecting sensor 30 which is turned on and off by the lever 5 can be adjusted up and down in a range to detect that an alien substance interposes between the door 1 and the opening of the cooking chamber.
  • the microprocessor inquires whether or not the photo-detecting sensor 30 is turned on and decides the state of it at processing block 500. In case the photo-detecting sensor 30 is turned off, the microprocessor displays an error on the display board at processing block 400 and performs the next operation (processing block 700). In case the photo-detecting sensor 30 is turned on, the microprocessor performs the next operation (for example, stand by) at processing block 600.
  • an apparatus according to the invention comprises a photo-detecting sensor and others without a mechanical switch.
  • said lever 5 is substituted for a lever mounted in the latch apparatus instead of the lever of the microswitch.
  • the invention detects the state of the door by using the mechanical switch and the photo-detecting sensor in order to prevent leakage of microwaves from the microwave oven, and it detects a defect of the mechanical switch, displays the state of door and gives alarm according to state of door.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
EP19910100007 1989-12-30 1991-01-02 Microwave oven's door opening and closing detection apparatus using photo-detecting sensor Expired - Lifetime EP0436486B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR890020810 1989-12-30
KR8920810U 1989-12-30

Publications (2)

Publication Number Publication Date
EP0436486A1 EP0436486A1 (en) 1991-07-10
EP0436486B1 true EP0436486B1 (en) 1994-10-12

Family

ID=19294830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910100007 Expired - Lifetime EP0436486B1 (en) 1989-12-30 1991-01-02 Microwave oven's door opening and closing detection apparatus using photo-detecting sensor

Country Status (3)

Country Link
EP (1) EP0436486B1 (ja)
JP (1) JP2509977Y2 (ja)
DE (1) DE69104504T2 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4234868A3 (en) 2017-05-15 2023-09-27 Apex Industrial Technologies LLC Motorized door assembly with safety features for heated cabinet

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1236105B (de) 1962-02-12 1967-03-09 Siemens Elektrogeraete Gmbh HF-Strahlungsherd mit selbsttaetiger Abschaltung der HF-Strahlung
JPS5924762B2 (ja) * 1977-04-04 1984-06-12 松下電器産業株式会社 高周波加熱装置
JPS5757495A (en) * 1980-09-22 1982-04-06 Matsushita Electric Ind Co Ltd High frequency heater
US4504719A (en) * 1982-02-22 1985-03-12 General Electric Company Door latch and method of assembly
JPS59129332A (ja) * 1983-01-14 1984-07-25 Toshiba Corp 高周波加熱調理装置

Also Published As

Publication number Publication date
JPH0587408U (ja) 1993-11-26
JP2509977Y2 (ja) 1996-09-04
DE69104504D1 (de) 1994-11-17
EP0436486A1 (en) 1991-07-10
DE69104504T2 (de) 1995-05-24

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