EP0073250B1 - Wärmekochgerät - Google Patents

Wärmekochgerät Download PDF

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Publication number
EP0073250B1
EP0073250B1 EP19820900561 EP82900561A EP0073250B1 EP 0073250 B1 EP0073250 B1 EP 0073250B1 EP 19820900561 EP19820900561 EP 19820900561 EP 82900561 A EP82900561 A EP 82900561A EP 0073250 B1 EP0073250 B1 EP 0073250B1
Authority
EP
European Patent Office
Prior art keywords
sheet
heating
back plate
operational panel
main body
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
Application number
EP19820900561
Other languages
English (en)
French (fr)
Other versions
EP0073250A4 (de
EP0073250A1 (de
Inventor
Yohzoh Ishimura
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0073250A1 publication Critical patent/EP0073250A1/de
Publication of EP0073250A4 publication Critical patent/EP0073250A4/de
Application granted granted Critical
Publication of EP0073250B1 publication Critical patent/EP0073250B1/de
Expired 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
    • H05B6/6435—Aspects relating to the user interface of the microwave heating apparatus
    • 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
    • F24C7/08—Arrangement or mounting of control or safety devices
    • 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
    • H05B6/66—Circuits
    • H05B6/666—Safety circuits

Definitions

  • This invention relates to an operational panel structure as the input unit of an electronic controller including a microcomputer LSI chip or the like for controlling the heat source of a heating appliance such as an electric oven or microwave oven.
  • the conventional heating appliance of the above described type is in the constant danger that it could be self-triggered due to incoming noise, a surge of lightening, noise static electricity, etc. and become operative against the user's will.
  • any heating appliance of the above type would start heating inadvertently even in the absence of a heating start instruction to a controller. Under these circumstances, the temperatures of the appliance body and the door rise drastically and the user would burn himself on those portions or the applicance itself would catch a fire and ignite surrounding inflammables such as a curtain.
  • unloaded heating in a microwave oven results in increasing the quantity of microwave radiations leaking from the periphery of the door and shortening the life of power unit components such as a magnetron.
  • a conventional heating appliance as shown in Fig. 7 includes in an operational panel 2 at the front of its main body 1 an ornamental plate 3, cook keys 4 and 5, cook key switches 6 and 7 and a board A9 carrying insulating spacers 8 and the cook key switches 6 and 7, and the ornamental plate 3, the cook keys 4 and 5, the cook key switches 6 and 7, the insulating spacers 8 and the board A9 together constitute a keyboard 10.
  • a metallic back plate 11 is disposed in contact with the board A9 and electrically connected to a chassis 12.
  • Another board 15 is provided which carries a microcomputer 13 responsive to signals from input keys such as the cook keys 4 and 5, electronic components 14 and the like.
  • a microcomputer 13 responsive to signals from input keys such as the cook keys 4 and 5, electronic components 14 and the like.
  • static charge on the operator's body may be conveyed to the reinforcing back plate 11 so that the back plate 11 serves as an antenna to feed current to the cook switches 6 and 7 and so forth in the keyboard 10 and send an error signal to the microcomputer 13, the electronic components 14 and the like on the board 15.
  • Such error signal would lead to a dangerous situation such as destruction of the microcomputer 13, electronic components 14 and so forth and an overheated condition in a variety of parts in the main body 1.
  • a heating appliance having an antistatic construction which is durable and withstands static of around 15 kV of the type described with reference to Figure 7 namely a heating appliance comprising a heating chamber defined in its main body, a heating means for heating the interior of said heating chamber, control means for controlling said heating means, said control means including a. microcomputer, an operational panel disposed at the front of said main body and made of-electrically insulating material, a keyboard disposed on said operational panel and including an ornamental plate, an insulating sheet and a board carrying electrical components which is supported by a back plate of a chassis.
  • the present invention is characterized in one aspect by a foil sheet between the ornamental sheet and the insulating sheet, and made of aluminum or other high tensile strength metal such as stainless steel, a grounding conductor provided integrally with said sheet wherein one end of said grounding conductor is forced against said board by means of said back plate and in that said back plate is grounded via the chassis of said main body.
  • the present invention is characterized in a further aspect by a foil sheet between the ornamental sheet and the insulating sheet, and made of aluminum or other high tensile strength metal such as stainless steel, a grounding conductor provided integrally with said sheet wherein a rib is provided on said operational panel, and said grounding conductor is held between said back plate and said rib and in that said back plate is grounded via the chassis.
  • the present invention is characterized in a further aspect by a foil sheet between the ornamental sheet and the insulating sheet, and made of aluminum or other high tensile strength metal such as stainless steel, a grounding conductor provided integrally with said sheet wherein a leaf spring is secured to said back plate, and said grounding conductor is forced against said operational panel by means of said leaf spring, and said back plate is grounded via the chassis.
  • Fig. 1 is a perspective view showing the appearance of a heating appliance according to an embodiment of the present invention
  • Fig. 2 is a cross sectional side view of the appliance
  • Fig. 3 is a cross sectional view of part of the appliance taken on the line Y-Y' of Fig. 1
  • Fig. 4 is a circuit diagram of a control circuit of the appliance
  • Figs. 5 and 6 are cross sectional views of part of a heating appliance according to another embodiment of the present invention
  • Fig. 7 is a cross sectional views of part of an operational panel in a conventional heating appliance.
  • FIGs. 1 to 4 there is illustrated a heating appliance constructed according to an embodiment of the present invention, wherein a metallic thin sheet 17 is bonded between an insulating sheet 16 and an ornamental plate 3 which are components of a keyboard 10 and is provided with a grounding conductor 18 extending from its one end and leading to the ground via a chassis 12.
  • a door 19 is provided to freely open across a front opening in the main body 1.
  • a heating chamber 20 is defined within the main body 1.
  • An operational panel 2 is disposed at the front of the main body 1 and on one side of the door, 19 which panel is made of an insulating material such as plastic and environed by an operational panel framework 21.
  • the keyboard 10 is disposed at the back of the operational panel 2 to extend over an aperture 22.
  • a plurality of input keys comprised of conductive material typically carbon peast, that is, cook keys 4 and 5 and a cook start key 23.
  • the above-mentioned keyboard 10 comprises said ornamental plate 3 which is exposed to the operator's fingers, the electrically conductive metallic sheet 17 typically made of aluminum foil or stainless steel foil, preferably a material of high tensile strength, and adhesively secured between the ornamental plate 3 and the insulating sheet 16, the insulating sheet 16, the plurality of input keys bonded to the insulating sheet 16, a plastic board A9 carrying switches 6 and 7 disposed in juxtaposition with said input keys, for example, cook keys 4 and 5, and an insulating spacer 8 for spacing the board A9 from the insulating sheet 16.
  • the electrically conductive metallic sheet 17 typically made of aluminum foil or stainless steel foil, preferably a material of high tensile strength
  • the grounding conductor 18 extending from the one end of the metallic thin sheet 17 as an integral unit is bent around the board A9 and electrically connected to the board A9 and a stepped portion 24 of a metallic back plate 11 disposed behind the board A9 and leading to the chassis 12 in the main body 1.
  • said electrically conductive metallic sheet 17 will be described in further detail. It is desirable from safe points of view that the bonding area of the sheet 17 be greater than the area of the aperture 22 in the operational panel 21 as seen in Fig. 3. In other words, the width of the sheet is larger than 1 1 in Fig. 3 and the vertical length thereof is larger than 1 2 in Fig. 1. It is necessary that the sheet 17 be positioned closer to the operation surface than the cook keys 4 and 5. These area and position relationships obviate the possibility of faulty operation because the cook keys 4 and 5 are electrically isolated from the exposed surface of the sheet 17 even when part of the operator's body comes into contact with the operational panel framework 21 or the ornamental plate 3 in actuating the keyboard manually from the front.
  • the ornamental plate 3 and the insulating sheet 16 are substantially equal in size and the sheet 17 is equal in size to these components as well, the sheet may be bonded more easily and lends itself better to mass production.
  • the sheet 17 may be bonded between the insultating sheet 16 and the cook keys 4 and 5.
  • the reference numeral 25 represents a pad on which wires connected to the switches 6 and 7 associated with the cook keys 4 and 5 are concentrated, and lead wires 26 leading from the pad 25 are connected to the electronic control device including the microcomputer 13, electronic components 14 and so forth mounted on a board 15.
  • the door switches 27 and 28 shown in Fig. 4 are closed. Then, as the cook key 4 or 5 and the cook start key 23 in the keyboard 10 are actuated, the microcomputer 13 operates so that a contact 30 of a relay 29 is closed and a high frequency generator 31 oscillates to generate high frequency waves.
  • the grounding conductor 18 extending from the sheet 17 and so forth is a metallic sheet such as an aluminum foil or a stainless steel sheet rather than a conductive rubber member or the like.
  • the respective sheets constituting the keyboard 10, for example, the sheet 17 and the insulating sheet 16, are more desirable for mass production than those made of rubber because the former may be roll-shaped and can be easily printed and bonded. This of course leads to low profile and compactness of the operational panel region.
  • the operator may depress the input keys on the keyboard 10 almost as lightly as in the case where the keyboard is not provided with the sheet 17 and more lightlythan in the case of a rubber-made keyboard, as if the keyboard were not provided with the sheet 17. Thus, the ease of operation is not affected in the least.
  • the sheet 17 of metal foil has a high tensile strength and is thus excellent in durability and shock resistance.
  • the provision of the sheet 17 prevents low voltage electric shocks in advance and assures a greater degree of safety.
  • the grounding conductor 18 of the sheet 17 may be forced against the back plate 11 and held in electric contact with the back plate 11 for grounding purposes by means of a resilient leaf spring 34 spot-welded to the back plate 11, in which case the above described advantages may be similarly expected.
  • the leaf spring 34 absorbs errors in assembling the keyboard so that the grounding conductor 18 is secured more tightly. in electric contact with the back plate 11.
  • the heating appliance embodying the present invention is such that the electrically conductive metallic thin sheet is disposed at the keyboard of the operational panel actuatable by the human body orthe like and is grounded via the chassis or a portion of the main body.
  • This arrangement prevents a faulty operation of the electric electronic controller including the microcomputer due to the static electricity accumulated on the human body or the like or a surge current and assures an increased degree of safety.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Push-Button Switches (AREA)
  • Elimination Of Static Electricity (AREA)
  • Details Of Measuring And Other Instruments (AREA)
  • Electric Ovens (AREA)

Claims (3)

1. Heizgerät mit einer Heizkammer (20), die in seinem Hauptkörper (1) abgegrenzt ist,
einer Heizvorrichtung (31) zum Heizen des Innern der Heizkammer (20),
einer Steuereinrichtung zum Steuern der Heizvorrichtung (31), wobei die Steuereinrichtung einen Mikrocomputer (13) enthält,
einer Bedienungstafel (2), die an der Vorderseite des Hauptkörpers (1) angeordnet ist und aus elektrisch isolierendem Material besteht,
einer Tastatur (10), die auf der Bedientafel (2) angeordnet ist, und enthaltend eine Zierplatte (3), eine isolierende Platte (16) und eine Karte (A9), die elektrische Bauelemente trägt und von einer Rückwand eines Chassis (12) abgestützt ist, gekennzeichnet durch ein Folienblatt (17) zwischen der Zierplatte und der isolierenden Platte, das aus Aluminium oder einem hoch zugfesten Metall, wie beispielsweise Edelstahl besteht, einen erdenden Leiter (18), der integral mit dem Blatt (17) ausgebildet ist, wobei ein Ende des erdenden Leiters (18) von der Rückwand (11) gegen die Karte (A9) gedrückt wird, und daß die genannte Rückwand (11) über das Chassis (12) des Hauptkörpers (1) geerdet ist.
2. Heizgerät mit einer Heizkammer (20), die in seinem Hauptkörper (1) abgegrenzt ist,
einer Heizvorrichtung (31) zum Heizen des Innern der Heizkammer (20),
einer Steuereinrichtung zum Steuern der Heizvorrichtung (31), wobei die Heizvorrichtung einen Mikrocomputer (13) enthält,
einer Bedientafel (2), die an der Vorderseite des Hauptkörpers (1) angeordnet ist und aus einem elektrisch isolierenden Material besteht,
einem Tastenfeld (10), das auf der Bedientafel (2) angeordnet ist und enthaltend eine Zierplatte (3), eine isolierende Platte (16) und eine Karte (A9), die elektrische Bauelemente trägt und von einer Rückwand eines Chassis (12) abgestützt ist, gekennzeichnet durch ein Folienblatt (17) zwischen der Zierplatte und der isolierenden Platte, das aus Aluminium oder einem anderen hoch zugfesten Metall, wie beispielsweise Edelstahl besteht, einen erdenden Leiter (18), der integral mit dem Blatt (17) ausgebildet ist, wobei eine Rippe (32) an der Bedientafel (2) ausgebildet ist und der erdende Leiter zwischen der Rückwand (11) und der Rippe (32) gehalten ist und daß die Rückwand (11) über das Chassis (12) geerdet ist.
3. Heizgerät mit einer Heizkammer (20), die in seinem Hauptkörper (1) abgegrenzt ist,
einer Heizvorrichtung (31) zum Heizen des Innern der Heizkammer (20),
einer Steuereinrichtung zum Steuern der Heizvorrichtung (31), wobei die Steuereinrichtung einen Mikrocomputer (13) enthält,
einer Bedientafel (2), die an der Vorderseite des Hauptkörpers (1) angeordnet und aus einem elektrisch isolierenden Material besteht,
einer Tastatur (10), die an der Bedientafel (2) angeordnet ist und enthaltend eine Zierplatte (3), eine isolierende Platte (16) und eine Karte (A9), die elektrische Bauelemente trägt und von einer Rückwand eines Chassis (12) abgestützt ist, gekennzeichnet durch ein Folienblatt (17) zwischen der Zierplatte und der isolierenden Platte, das aus Aluminium oder einem anderen hoch zugfesten Metall, wie beispielsweise Edelstahl besteht, . einen erdenden. Leiter (18), der integral mit dem Blatt (17) ausgebildet ist, wobei eine Blattfeder (34) an der Rückwand (11) befestigt ist; und daß der erdende Leiter (18) von der Blattfeder (34) gegen die Bedientafel (2) gedrückt ist, und daß die Rückwand (11) über das Chassis geerdet ist.
EP19820900561 1981-03-02 1982-02-10 Wärmekochgerät Expired EP0073250B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP30401/81 1981-03-02
JP3040181A JPS57144826A (en) 1981-03-02 1981-03-02 Heating cooker

Publications (3)

Publication Number Publication Date
EP0073250A1 EP0073250A1 (de) 1983-03-09
EP0073250A4 EP0073250A4 (de) 1983-07-04
EP0073250B1 true EP0073250B1 (de) 1986-12-17

Family

ID=12302907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820900561 Expired EP0073250B1 (de) 1981-03-02 1982-02-10 Wärmekochgerät

Country Status (6)

Country Link
EP (1) EP0073250B1 (de)
JP (1) JPS57144826A (de)
AU (1) AU547740B2 (de)
CA (1) CA1189168A (de)
DE (1) DE3274757D1 (de)
WO (1) WO1982003113A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5798395A (en) * 1994-03-31 1998-08-25 Lambda Technologies Inc. Adhesive bonding using variable frequency microwave energy
US5644837A (en) * 1995-06-30 1997-07-08 Lambda Technologies, Inc. Process for assembling electronics using microwave irradiation
US5750968A (en) * 1995-06-30 1998-05-12 Lambda Technologies, Inc. System and apparatus for reducing arcing and localized heating during microwave processing
KR100239514B1 (ko) * 1996-07-29 2000-01-15 윤종용 전자렌지

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5716119B2 (de) * 1974-05-07 1982-04-02
US4056699A (en) * 1975-11-13 1977-11-01 Essex International, Inc. Touch plate assembly
JPS5726250Y2 (de) * 1977-01-14 1982-06-08
JPS5910486Y2 (ja) * 1977-04-06 1984-04-03 松下電器産業株式会社 高周波加熱装置
GB2016704B (en) * 1978-03-16 1982-07-07 Texas Instruments Inc Capacitive touch switch panel and method of fabricating sam
JPS556118A (en) * 1978-06-26 1980-01-17 Sharp Corp Control panel for microwave oven
JPS5449458A (en) * 1978-09-04 1979-04-18 Toshiba Corp Feed apparatus
JPS5614906U (de) * 1979-07-11 1981-02-09
JPS5716119U (de) * 1980-06-23 1982-01-27

Also Published As

Publication number Publication date
EP0073250A4 (de) 1983-07-04
DE3274757D1 (en) 1987-01-29
AU547740B2 (en) 1985-10-31
AU8142682A (en) 1982-09-28
EP0073250A1 (de) 1983-03-09
WO1982003113A1 (en) 1982-09-16
CA1189168A (en) 1985-06-18
JPS57144826A (en) 1982-09-07
JPH0160739B2 (de) 1989-12-25

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