JP2011159416A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a degree of freedom in arranging an electrode in circumference of a heating means, and to improve a degree of freedom in arranging the heating means. <P>SOLUTION: First and second electrode parts 6 and 7 of almost circular arc shape are provided around first and second heating means 3 and 4 of a lower surface of a top plate 1. An electric capacitance detecting means 8 includes an oscillating part applying AC signal to the first and second electrode parts 6 and 7, and detects the increasing amount of electric capacitance of the first and second electrode parts 6 and 7. By contacting first and second connection terminals 10 and 11 connected to the electric capacitance detecting means 8, the first and second connection terminals 10 and 11 are connected and the first and second electrode parts 6 and 7 are conducted. Further, first and second electrode connection parts 12 and 13 provided in front of the first and second heating means 3 and 4, and first and second electrode communication parts 14 and 15 which connect the first and second electrode parts 6 and 7 and the first and second electrode connection parts 12 and 13 and are narrower than the first and second electrode parts 6 and 7, are arranged between the first heating means 3 and the second heating means 4 in almost parallel to one another. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heating cooker that cooks on a top plate.

  Conventionally, in this type of cooking device, a capacitive electrode is provided on the top plate in a circle or a substantially rectangular shape around the heating means for the object to be heated.

JP-A-61-243690

  However, in the conventional configuration, since the electrode configuration is arranged on the outer periphery of the heating means on the top plate, in the cooking device provided with two or more heating means, a plurality of electrodes may be arranged due to space problems. It was difficult to cope with the spilling of large pots.

  The present invention solves the above-described conventional problems, and can increase the degree of freedom of electrode arrangement around the heating means and improve the degree of freedom of arrangement of the heating means. An object of the present invention is to provide a heating cooker that can improve the cost and can reduce the cost by reducing the wiring.

  In order to solve the conventional problems, a heating cooker according to the present invention includes a top plate on which an object to be heated is placed, a main body provided below the top plate, and the heated object provided below the top plate. First and second heating means for heating an object, a control unit for controlling the heating output of the first and second heating means, and the first and second heating means on the lower surface of the top plate around the first and second heating means. The first and second electrodes each including one or more substantially arc-shaped first and second electrode portions provided in each of the first and second heating means, and an oscillating portion for applying an AC signal to the first and second electrode portions. The first and second connection terminals are connected to each other by contact between a capacitance detection means for detecting an increase in capacitance of the part and first and second connection terminals connected to the capacitance detection means. The first plate provided on the lower surface of the top plate. And the first and second electrode connecting portions provided in front of the first and second heating means, the first and second electrodes, and the first and second electrode connections. And first and second electrode communication portions that are thinner than the first and second electrodes that connect the first and second electrodes, and the first and second electrode communication portions are substantially parallel between the first heating means and the second heating means. It is set as the structure formed by arrange | positioning.

  As a result, when the pan is placed above the first and second electrode communication units by heating the large pan or by shifting the pan during heating, the increase in capacitance can be reduced. The ability to prevent detection, increase the degree of freedom of electrode arrangement around the heating means, improve the degree of freedom of arrangement of the heating means, detect the spilling of large pots, increase safety, and reduce wiring An object is to provide a heating cooker that can reduce costs.

  The present invention can increase the degree of freedom of arrangement of the electrodes around the heating means and improve the degree of freedom of arrangement of the heating means, and can increase the safety by detecting the spilling of a large pan, and by reducing the wiring It is possible to provide a cooking device that can reduce costs.

Whole structure schematic of the heating cooker in Embodiment 1 of this invention Front view of top surface of top plate of heating cooker according to Embodiment 1 of the present invention The block diagram which shows the cross section of the heating cooker in Embodiment 1 of this invention. Overall perspective view of induction heating cooker in a conventional example

  The first invention includes a top plate for placing an object to be heated, a main body provided below the top plate, first and second heating means for heating the object to be heated provided below the top plate, One or more of the first and second heating means are provided around the first and second heating means on the lower surface of the top plate, respectively, for controlling the heating output of the first and second heating means. A static arc for detecting an increase in capacitance of the first and second electrode parts including first and second electrode parts having a substantially arc shape and an oscillating part for applying an AC signal to the first and second electrode parts. The first provided on the lower surface of the top plate connected to the first and second connection terminals by contact between the capacitance detection means and the first and second connection terminals connected to the capacitance detection means. And conducting to the second electrode part, From the first and second electrodes connecting the first and second electrodes, and the first and second electrodes connecting the first and second electrodes and the first and second electrodes connecting portions provided in front of the first and second heating means. The first and second electrode communication sections, and the first and second electrode communication sections are arranged substantially in parallel between the first heating means and the second heating means to heat a large pan. When the pan is placed above the first and second electrode communication units by shifting the pan during heating, the amount of increase in capacitance can be reduced and false detection can be prevented, and the surroundings of the heating means It is possible to increase the degree of freedom of arrangement of the electrodes and improve the degree of freedom of arrangement of the heating means, to detect the spilling of a large pan and to improve safety, and to reduce the cost by reducing the wiring.

  According to a second aspect of the present invention, a predetermined increase in the capacitance detected by the capacitance detection means that determines that liquid has been spilled on a portion of the top plate facing the first electrode portion during heating by the first heating means. The areas of the first and second electrode connecting portions are determined so that the amount is larger than the amount of increase in capacitance when the liquid spills over the entire portion of the top plate facing the first electrode connecting portion. Accordingly, the detection sensitivity of the spillage above the electrode connection portion can be suppressed, and erroneous detection can be prevented.

  According to a third aspect of the present invention, there is provided a display substrate provided in front of the first and second heating means below the top plate and connected to the control unit, and a heating output or heating state provided on the top plate above the display substrate. By providing the display substrate with the first and second connection terminals, the space around the first and second heating means can be secured and the cost can be reduced by reducing the wiring.

  According to a fourth aspect of the present invention, there is provided an operation board provided in front of the first and second heating means below the top plate and connected to the control unit, and a heating output of the heating means provided on the top plate above the operation board. An operation unit having a heating output adjustment button or a heating start button for adjusting the temperature, and by providing first and second connection terminals on the operation board, securing a space around the first and second heating means Costs can be reduced by reducing wiring.

(Embodiment 1)
FIG. 1 is an overall schematic diagram of the cooking device according to Embodiment 1 of the present invention, and FIG. 2 is a front view of the top surface of the top plate of the cooking device according to Embodiment 1 of the present invention. FIG. 3 is a block diagram showing a cross section of the cooking device according to Embodiment 1 of the present invention.

In FIG. 1, a heated object 16 such as a pot containing water is placed on a translucent top plate 1 and heated by a first heating means 3 and a second heating means 4 disposed below the top plate 1. . Note that the top plate has a high heat resistant temperature and is preferably an insulating material. A main body 2 that holds the entire internal organs is provided below the top plate 1. The first heating unit 3 and the second heating unit 4 are connected to a control unit 5 that controls the heating output, and the control unit 5 is disposed below the first heating unit 3 and the second heating unit 4. In front of the first heating means 3 and the second heating means 4 below the top plate 1, a display board 17 connected to a control board indicating a heating output or a heating state is arranged, and an LED arranged on the display board 17. The display can be visually recognized on the display unit 19 above the top plate 1 by light emission from an LCD or the like. Further, the display substrate 17 of the present embodiment is provided with a capacitance detection means, and is provided with an operation terminal 21 made of electrostatic rubber, so that a heating output adjustment button or heating of the operation unit 20 above the top plate 1 is provided. When the user touches the start button, the heating start or heating output of the first heating means 3 and the second heating means 4 can be adjusted. The operation terminal 21 may be made of metal.

  The main body 2 constituting the outer shell is connected to the ground via a power cord (not shown).

  In FIG. 2, substantially arc-shaped first and second electrode portions 6 and 7 provided at least around the first heating means 3 and the second heating means 4 disposed on the lower surface of the top plate 1 are formed of carbon. Is arranged by printing. Needless to say, the first electrode portion 6 and the second electrode portion 7 may be arranged by attaching a thin copper plate, or the capacitance can be easily detected if it is a conductor. The first electrode means 6 and the second electrode part 7, which are communication lines of the first electrode part 6 and the second electrode part 7, are narrower than the first electrode communication part 14 and the second electrode communication part 15. And connected to the first electrode connecting portion 12 and the second electrode connecting portion 13 provided in front of the second heating means 4. The first electrode connection portion 12 and the second electrode connection portion 13 are connected to the capacitance detection means 8 by contact between the first connection terminal 10 and the second connection terminal 11 of FIG. Further, the electrostatic capacitance detection means 8 of the present embodiment also serves as the display substrate 17 and the operation substrate 18. Further, by arranging the first electrode communication unit 14 and the second electrode communication unit 15 substantially in parallel, a space is secured, and the first electrode unit 6 and the second electrode unit 7, the first heating means 3 and the second heating unit are secured. The degree of freedom of arrangement of the means 4 can be improved, and a cost reduction effect due to a reduction in wiring can be expected. Further, when the number of heating means is increased, there is a high possibility that the distance between the heating means will be narrowed, and the first electrode communication unit 14 and the second electrode communication unit 15 are arranged substantially in parallel so that there is a relatively large space. It becomes possible to arrange the first electrode connection portion 12 and the second electrode connection portion 13 in front of the first heating means 3 and the second heating means 4.

  In FIG. 3, when the liquid 22 spills on the top plate 1 around the object to be heated 16, the first electrode unit 6 or the second electrode unit 7 is connected to the first electrode communication unit 14 or the second electrode communication unit 15. The first electrode connection portion 12 or the second electrode connection portion 13 is connected to the capacitance detecting means 8 via the first connection terminal 10 or the second connection terminal 11 and is heated by the adhesion of the liquid 22. By detecting an increase in the capacitance between the object 16 and the object 16, it is possible to determine whether the spillage has occurred. A signal is transmitted to the control unit 5 connected to the capacitance detection means 8 when the capacitance detection means 8 determines that the spillage has occurred. The control unit 5 performs control to stop the spilling of the liquid 22 by reducing or setting the heating output of the first heating unit 3 or the second heating unit 4 to zero. In addition, since the capacitance detection means 8 of the present embodiment also serves as the display substrate 17 and the operation substrate 18, the heating output and heating of the first heating means 3 or the second heating means 4 in the control unit 5 are provided. The heating output and the heating state can be displayed on the display unit 19 which transmits the state and emits light from the LED or LCD disposed on the display substrate 17 and is also received by the top plate 1. Further, when the user touches the heating output adjustment button or the heating start button of the operation unit 20, the operation board 18 detects an increase in capacitance and transmits a heating output adjustment or heating start signal to the control unit 5. To do. The controller 5 adjusts the heating output of the first heating means 3 or the second heating means 4 or starts heating.

  The operation and action of the cooking device configured as described above will be described.

  When the user touches the heating output adjustment button or the heating start button of the operation unit 20, the operation substrate 18 detects an increase in capacitance and transmits a heating start signal to the control unit 5. The controller 5 starts heating the article to be heated 16 by the first heating means 3. The object to be heated 16 is a pan containing a liquid 22 such as water. The liquid level rises due to temperature rise or evaporation due to heating, or bubbles are generated, so that the liquid 22 spills outside the object to be heated 16. Then, it travels along the outer surface of the object to be heated 16 and falls to the outer periphery of the object to be heated 16 on the top plate 1. Since the capacitance up to the capacitance detection means 8 that is in conduction with the first electrode portion 6 due to the adhesion of the liquid 22 increases, the capacitance detection means 8 detects and determines the spillage. The control of stopping the spilling of the liquid 22 is performed by decreasing or setting the heating output of the first heating means 3 or the second heating means 4 to zero. When the heating cooker of the present invention is an induction heating cooker, the first heating means 3 is an induction heating coil, and the distance between the first electrode unit 6 and the first heating means 3 is set to generate an alternating magnetic field. If the distance is near, capacitance noise due to an alternating magnetic field is generated, so that a certain distance or more can be secured to prevent malfunction. For this reason, it is difficult to arrange the first electrode part 6 and the second electrode part 7 at a short distance from the induction heating coil. In this example, since the first electrode communication unit 14 and the second electrode communication unit 15 are arranged substantially in parallel, the degree of freedom in arrangement of the arc-shaped first electrode unit 6 and second electrode unit 7 is increased. It is possible to ensure a distance from the first heating means 3 (induction heating coil), and the diameter of the object to be heated 16 is large above the first electrode communication unit 14 and the second electrode communication unit 15 on the top plate. Even when placed due to a pan slip, etc., the sensitivity of the increase in capacitance is dull because the width of the electrode is narrowed, and misdetection is difficult.

  As described above, the heating cooker according to the present invention can increase the degree of freedom of the arrangement of the electrodes around the heating means and improve the degree of freedom of the arrangement of the heating means. Since the cost can be reduced by reducing the number of wires, the present invention can also be applied to uses such as domestic or commercial heating cookers in which a pan is placed on a top plate for cooking.

DESCRIPTION OF SYMBOLS 1 Top plate 2 Main body 3 1st heating means 4 2nd heating means 5 Control part 8 Capacitance detection means 10 1st connection terminal 11 2nd connection terminal 12 1st electrode connection part 13 2nd electrode connection part 14 1st electrode Communication unit 15 Second electrode communication unit 16 Object to be heated 17 Display substrate 18 Operation substrate 19 Display unit 20 Operation unit 21 Operation terminal 22 Liquid 23 Electrode

Claims (4)

A top plate on which an object to be heated is placed, a main body provided below the top plate, first and second heating means for heating the object to be heated provided below the top plate, and the first and first A control section for controlling the heating output of the two heating means, and a substantially arc-shaped first provided at least one of the first and second heating means around the first and second heating means on the lower surface of the top plate. And a capacitance detecting means for detecting an increase in capacitance of the first and second electrode parts, including an oscillation part for applying an alternating current signal to the first and second electrode parts, and a second electrode part; The first and second electrode portions provided on the bottom surface of the top plate connected to the first and second connection terminals by contact with the first and second connection terminals connected to the capacitance detecting means. And conducting the first and second additional components. First and second electrode connecting portions provided in front of the means, and first and second electrodes thinner than the first and second electrodes connecting the first and second electrodes and the first and second electrode connecting portions. And a second electrode communication unit, wherein the first and second electrode communication units are arranged substantially in parallel between the first heating unit and the second heating unit. The predetermined increase amount of the capacitance detected by the capacitance detection means for determining that the liquid has been spilled on the portion of the top plate facing the first electrode portion during heating by the first heating means is on the top plate. The areas of the first and second electrode connecting portions are determined so as to be larger than the increase in capacitance when the liquid is blown over the entire portion facing the first electrode connecting portion. Item 2. The heating cooker according to item 1. A display substrate provided in front of the first and second heating means below the top plate and connected to the control unit; a display unit indicating a heating output or a heating state provided on the top plate above the display substrate; The cooking device according to any one of claims 1 to 2, wherein the display substrate is provided with first and second connection terminals. An operation board provided in front of the first and second heating means below the top plate and connected to the control unit, and a heating output adjustment for adjusting the heating output of the heating means provided on the top plate above the operation board The cooking device according to any one of claims 1 to 3, further comprising an operation unit having a button or a heating start button, wherein the operation board is provided with first and second connection terminals. .

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