JP2003272816A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker having a touch switch, utilizing electrostatic capacity formed on the surface of a top plate, prevented from wrong operation caused by the way of touching of a user. <P>SOLUTION: A conductive film is formed to a part of the top plate touched by a finger, so as to normally operate the heating cooker by touching the conductive film only by a tip of a finger. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an operating device for operating a heating cooker.

[0002]

2. Description of the Related Art In a heating cooker such as an induction heating cooker,
A top plate made of heat-resistant glass is provided on the top of a housing that houses a plurality of heaters, induction heating coils, an inverter circuit, a control unit of the inverter circuit, and the like. A user of the heating cooker places a cooking container for heating cooking in a predetermined position indicated by, for example, a circle on the top plate. In a typical product, three predetermined positions are indicated by circles so that three cooking vessels can be heated simultaneously. The switches operated by the user such as turning the power of the cooking device on and off, adjusting the amount of heat to be heated, and the indicator light and indicator for displaying the usage status are located on the front of the housing (facing the user. Attached to the operation panel provided on the surface to be operated. As the operation panel, there is a fixed type which is fixed to a surface vertical to the top plate on the front surface of the housing. The fixed operation panel is vertical to the top plate and below the top plate, so when operating the switches on the operation panel or checking the display, the user bends the upper body to move the operation panel. You need to look into it. Therefore, there is a problem in operability.

As an improved type of the fixed type operation panel,
There is a rotating storage type operation panel in which the operation panel is attached to a small rotatable box and is incorporated in the front part of the housing. This rotary storage type operation panel is advantageous in that it does not interfere with the user during storage because it is extended forward and stored in the back of the housing when it is not needed. However, it may get in the way because it protrudes forward when used. Therefore, the user comes to use the rotary storage type panel by pulling out and operating it only when necessary during heating and cooking, and immediately storing it when the operation is finished. Such usage is complicated,
This type of operation panel also had a problem in terms of operability.

In order to solve the above problems, a prior art in which an operation switch and a display body are provided in an end region of the top plate near the user (hereinafter referred to as the front part of the top plate) is disclosed in Japanese Patent Laid-Open No. 10-214677. It is shown in the official gazette.
According to this prior art, an operation switch that operates according to a change in capacitance is provided on the front part of a top plate made of tempered glass. This operation switch has a copper foil plane electrode formed on the lower surface of the top plate. A connection portion is provided on the lower surface of the top plate at a position apart from the flat electrode, and the connection portion and the flat electrode are connected by a conductive wire. A contact that is connected to a detection circuit that detects the change in capacitance is in contact with the connection portion, and the plane electrode is connected to the detection circuit via this contact. When a person's finger approaches or touches a region of the top plate upper surface facing the plane electrode on the lower surface of the top plate, the electric potential of the plane electrode changes due to the capacitance between the plane electrode and the finger. The detection circuit detects this potential change and obtains an input indicating that the operation switch has been operated.

[0005]

SUMMARY OF THE INVENTION In the above prior art,
A flat electrode is provided only on the lower surface of the top plate, and no electrode is provided on the upper surface. Therefore, the operation of the operation switch is affected by the "touching" when touching the top surface of the top plate with a finger. Normally, a finger is pressed against the upper surface, and the sensitivity of the detection circuit is set so that the operation switch operates by the electrostatic capacitance generated when most of the region of the tip of the finger faces the flat electrode. Therefore, when touching the top surface of the top plate with a finger, the operation switch may not operate if only the tip of the finger is touched lightly. This is because, when the tip of the finger is lightly touched, the capacitance between the tip of the finger and the planar electrode is small, and thus the capacitance is small. In order to ensure that the operation switch operates even with a small electrostatic capacitance when only the tip of a finger is touched lightly, it is necessary to increase the detection sensitivity. However, if the detection sensitivity is increased, then the operation switch will operate if you accidentally touch the top surface of the top plate facing the connecting part or the conductor between the flat electrode and the connecting part, or if you touch it without touching it. Inconvenience occurs. It is an object of the present invention to provide a heating cooker with good operability, which eliminates the above disadvantages.

[0006]

The cooking device according to the present invention comprises:
A top plate of an electrically insulating plate member provided on the upper surface of the housing, a heating unit that heats an object to be heated, a control unit that controls the heating unit, and a user to input a command to the control unit At least one operation area set on the upper surface of the top plate to be operated, a detection part of a conductor provided on the back surface of the top plate facing each of the operation areas, and connected to the detection part by a conductor, A connection part of a conductor provided on the back surface of the top plate so as to be located away from the detection part in a direction away from the user, and the connection part so as to electrically connect the detection part and the control part. It has a connection terminal. According to the above configuration, since the connection portion is provided at a position away from the detection portion in the direction away from the edge of the top plate facing the user, the user's finger or the like approaches the connection portion. There is little to do. Therefore, erroneous operation of the operation switch can be significantly reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
A top plate of an electrically insulating plate member provided on the upper surface of the housing, a heating unit that heats an object to be heated, a control unit that controls the heating unit, and a user to input a command to the control unit At least one operation area set on the upper surface of the top plate to be operated, a detection part of a conductor provided on the back surface of the top plate facing each of the operation areas, and connected to the detection part by a conductor, A connection part of a conductor provided on the back surface of the top plate so as to be located away from the detection part in a direction away from the user, and the connection part so as to electrically connect the detection part and the control part. It has a connection terminal. The heating cooker according to the invention of claim 2 is
The operation region is formed of a non-conductive material.

According to a third aspect of the present invention, there is provided a heating cooker having a top plate of a non-magnetic and electrically insulating plate-like member provided on an upper surface of a casing for placing an object to be heated, and a casing below the top plate. At least one heating unit provided in the body for heating the object to be heated, a control unit for controlling the heating unit, and at least one set on the upper surface of the top plate operated by a user to operate the control unit One operation area, a detection section of a conductor provided in an area on the lower surface of the top plate facing each of the at least one operation area, for detecting the approach of a human body to the operation area, and the detection section. A conductor connecting portion provided on the lower surface of the top plate, which is connected by a conductor and is located away from the detecting unit in a direction away from an edge of the top plate facing the user, and Having a connecting terminal in contact with the connection part, to transmit the electrical signal of the detection unit to the control unit.

The cooking device according to a fourth aspect of the present invention is characterized in that the area of the detecting portion is approximately equal to the area from the tip of the index finger of the person to the first joint. The heating cooker according to the invention of claim 5 is characterized in that a conductive film is provided in the operation region. The heating cooker according to the invention of claim 6 is characterized in that the area of the connecting portion is in the range of ½ to ⅓ of the area of the detecting portion.

According to a seventh aspect of the present invention, there is provided a cooking device characterized in that the distance between the detector and the connector is longer than the dimension of the detector in the front-rear direction. The cooking device according to the invention of claim 8 is characterized in that it has a plurality of protrusions on the contact surface of the connection terminal with the connection portion. A heating cooker according to a ninth aspect of the invention is characterized in that the connection terminal has elasticity to expand and contract in a direction perpendicular to the surface of the top plate.

A heating cooker according to a tenth aspect of the present invention is a non-magnetic and electrically insulating plate-shaped top plate for mounting an object to be heated, which is provided on the top surface of the housing, and inside the housing below the top plate. A heating unit for heating the object to be heated, a control unit for controlling the heating unit, and a conductive member provided on the upper surface of the top plate, which is operated by a user to operate the control unit. One operation unit, a conductor detection unit for detecting contact of a human body with the operation unit, which is provided in a region of the lower surface of the top plate facing each of the at least one operation unit, A conductor connecting portion provided on the lower surface of the top plate at a position away from the detecting portion in a direction away from an edge of the top plate facing the user, and the contact. Contacting the part has a connection terminal for transmitting an electrical signal of the detection unit to the control unit.

The heating cooker according to an eleventh aspect of the present invention is characterized in that the connection terminal is a metal leaf spring. The heating cooker according to the invention of claim 12 is characterized in that the connection terminal is made of conductive rubber. A heating cooker according to a thirteenth aspect of the invention is characterized in that at least one heating unit is an induction heating coil, and the control unit supplies a high-frequency current to the induction heating coil to heat an object to be heated.

<Embodiment> A preferred embodiment of the heating cooker of the present invention will be described with reference to FIGS. 1 to 9. FIG. 1 is a plan view of a heating cooker according to an embodiment of the present invention, and FIG. 2 is I of FIG.
It is an I-II sectional view. 1 and 2, the housing 1
A transparent or translucent heat-resistant glass top plate 2 is provided on the upper surface of the, and the user puts a pan, a frying pan, a kettle, and the like, which are objects to be heated, on the top plate 2. Hereinafter, the pan 3 will be described as a representative of various cooking containers. The upper surface 2A of the top plate 2 is usually provided with two heating areas 21 and 22. Heating area 2
Reference numerals 1 and 22 are places where objects to be heated which are heated by a radiant heater using nichrome wire or an induction heating coil are placed. The other one heating area 23 is a radiant heater using a nichrome wire and is a preliminary heating area, and thus detailed description thereof will be omitted. A heating area 21 on the surface of the top plate 2,
For example, two large and small concentric circles 24 and 25 are drawn on 22 respectively to indicate the areas where the pot 3 should be placed. Yen 24
Is for a large pot and the circle 25 is for a small pot. Figure 1
In addition, in FIG. 2, the side portion of the housing 1 facing the user is referred to as a “front portion F”. In FIG. 1, the lower end portion of the drawing is the front portion F.

In FIGS. 1 and 2, an upper surface operating portion 30 is provided in the central region of the front portion F of the top plate 2.
The upper surface operation unit 30 has operation pads 31 to 36 provided on the top plate 2 for the user to operate, as will be described later in detail with reference to FIG. On the side of the case 1,
An operation circuit section 60 is provided which is connected to the upper surface operation section 30 when the top plate 2 is attached to the housing 1. The operation circuit unit 60 also includes a display unit that displays the operating states of the heating regions 21 and 22.

Inside the housing 1, below the top plate 2, heating bodies (heating units) 4 and 5 such as a radiant heater and an induction heating coil of each of the heating regions 21 and 22 are arranged. The heating elements 4 and 5 are connected to the inverter unit 11 controlled by the control unit 10. When the heating elements 4 and 5 are induction heating coils, high frequency power having a frequency of 20 KHz to 50 KHz is supplied from the inverter unit 11. When using an induction heating coil, the induction heating coil is placed under the pan via the top plate,
The heating area and the operating area can be on the same plane. Therefore, it is possible to obtain a heating cooker that is easy to clean the top plate surface and has improved operability and is less likely to be erroneously operated. The operation circuit unit 60 is connected to the control unit 10, and a signal according to a user's operation is applied to the control unit 10. In addition, a display signal indicating the operating state of the heating regions 21 and 22 is applied from the control unit 10 to the display unit of the operation circuit unit 60. The front panel F has a rotating panel 1 that can be stored in the housing 1 when not needed.
Two are provided. Switches that are rarely used, such as a switch for controlling a radiant heater, are attached to the rotary panel 12, and these switches are also connected to the control unit 10.

The heating areas 21 and 22 of the top plate 2 are respectively provided with a temperature sensor 7 for detecting the temperature of the pan 3 and a pan detector 8 for detecting the presence / absence of the pan 3, which are respectively connected to the control section 10. ing. The control unit 10 and the inverter unit 11 are connected to, for example, an AC 100V AC power source and supplied with AC power.

The upper surface operation section 30 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is a view of the upper surface operation unit 30 viewed from the upper surface 2A of the top plate 2. In the figure, operation pads 31, 32, 33, 34, 35 and 36
Is a conductive film provided on the upper surface of the top plate 2. The operation pads 31 to 36 are operated by the user in the heating area 21,
It is a region to be touched with fingers for operating the heating elements 4 and 5 of 22 and is therefore referred to as an “operating region”. Operation pads 31 to 36
Is formed of a conductive film such as a coating film of conductive ink or paint or a screen printing film, or a metal vapor deposition film, and a triangle mark, a circle mark, or a cut / on character is formed with ink or paint of different colors. It is printed. The operation pads 31 to 33 are for performing switching on / off of the heating area 21 on the left side and operations for adjusting the heat power, and the operation pads 34 to 36 are on the right heating area 2
This is for performing the operations of turning on / off 2 and adjusting the heat power.
The operation pad 32 is a “off / on” switch for starting heating by the heating area 21. The black circles to the left of the three circles on the operating pad indicate that this operating pad 32 is for operating the left heating area 21. Similarly, the black circle on the right side of the operation pad 35, which is the off / on switch, indicates that the operation pad 35 is on the right side of the heating region
It shows that it is a thing. As shown in FIG. 3, the top plate 2 includes a transparent portion 37 including two semicircles and four rod-shaped regions surrounding the operation pads 31 to 33, and a similar transparent portion 38 surrounding the operation pads 34 to 36. There is.
In FIG. 3, a rectangular transparent portion 39 is also provided above the transparent portions 37 and 38. The transparent parts 37, 38 and 39 will be shown in FIG.
Will be described in detail with reference to. An opaque or semi-transparent paint is applied to the lower surface of the top plate 2 except for the transparent portions 37, 38 and 39 so that the inside of the housing 1 cannot be seen. The transparent portions 37 to 39 may be translucent.

FIG. 4 shows the detection units 41, 42, which are provided on the lower surface 2B of the top plate 2 and belong to the upper operation unit 30.
43, 44, 45 and 46 and their respective connection parts 5
FIG. 5 is a plan view of 1, 52, 53, 54, 55 and 56.
The connecting portions 51 to 56 are the connecting conductors 51A to 56, respectively.
It is connected to the detection units 41 to 46 via A. Detector 4
1-46, connection conducting wires 51A-56A and connecting portions 51-5
Reference numerals 6 are conductive films formed on the lower surface 2B of the top plate 2, respectively, and are formed of a conductive paint coating film or a screen printing film, or a metal vapor deposition film. Detector 41
The area of 46 is approximately equal to the area of the region from the tip of the index finger of the person to the first joint. In FIG. 4, the detection portions 41 to 46 formed on the lower surface 2B of the top plate 2,
The connecting conductors 51A to 56A and the connecting portions 51 to 56 are shown in FIG.
In order to facilitate understanding of the relationship with the operation pads 31 to 36, it is shown as viewed from the upper surface 2A of the top plate 2. The broken lines in FIG. 3 indicate the detection units 41 to 41 shown in FIG.
The positions of 46 and the connecting portions 51 to 56 are shown.

3 and 4, the top plate 2
The detectors 41 to 46 provided on the lower surface 2B of the device face the operation pads 31 to 36 provided on the upper surface 2A, respectively, and respectively form capacitors. As will be described later in detail, the connecting portions 51 to 56 are located above the respective detecting portions 41 to 46 in FIG. 4, that is, at positions away from the front portion F toward the back from the front portion F of the heating cooker. It is provided. The separation distance between each of the connection parts 51 to 56 and each of the detection parts 41 to 46, that is, the length of the connection conductors 51A to 56A is longer than the length of each of the detection parts 41 to 46 before and after. desirable. The areas of the connection parts 51 to 56 are the same as the areas of the detection parts 41 to 46 in order to prevent malfunctions when the user touches the vicinity of the connection parts 51 to 56 on the top plate 2 with a finger. It is desirable to be in the range of ½ to ⅓.

The connecting portions 51 to 56 shown in FIG. 4 are connected to the housing 1 when the top plate 2 is attached to the housing 1 in the assembly process.
The contact 61 of the operation circuit unit 60 shown in FIG.
~ 66 respectively. In FIG. 5, the operation circuit unit 60 includes backlight units 71 and 72 that emit illumination light upward on the lower left side (corresponding to the front portion F side in FIG. 2) of the contacts 61 to 66. ing. When the housing 1 and the top plate 2 are combined, the backlight portion 7
1 overlaps the transparent part 37 of FIG. 3, and the backlight part 72 overlaps the transparent part 38. The backlight units 71 and 72 are turned on when the heating regions 21 and 22 are in the “operable state”, and illuminate the periphery of the operation pads 31 to 33 and the operation pads 34 to 36. This informs the user that the heating regions 21, 22 are in the "operable state".

In FIG. 5, there are nine light emitting portions 75 of the operation circuit portion 60 provided on the upper right of the contacts 61 to 66.
The light emitting section 76 includes eight rod-shaped light emitting cells 75i and 76i, each of which has a length that increases from left to right. The length of the light emitting cell represents the magnitude of the high frequency power supplied to the heating bodies 4 and 5 in the heating regions 21 and 22, respectively. The light emitted from the light emitting portions 75 and 76 is emitted upward through the transparent portion 39 shown in FIG. 3 so that the user can see it. The high frequency power is the operation pad 33 or 36 of FIG.
Is increased by the user touching it with a finger and decreased by touching the operation pad 31 or 34.

FIG. 6A shows the operation circuit section 6 shown in FIG.
FIG. 7 is a perspective view of one contact 65 of the contacts 61 to 66 of 0, and a part of a holding frame 80 holding the contact 65. 6B is a cross-sectional view taken along the line VIb-VIb of FIG. FIG. 7 is a perspective view of the contact 65. In FIG. 6A, the holding frame 80 is a molded plastic product and has a plurality of cells 81A, 81B, 81C ... (Six in the case shown in FIG. 5). Each cell 81A, 81B, 81C,
Since all have the same structure, the configuration will be described in detail with the cell 81B as a representative. A protrusion 82 for holding the upper portion of the contact 65 shown in FIG. 7 is integrally formed on the upper portion of the cell 81B. At the lower part of the cell 81B, as shown in FIG. 6A, a pair of lower holding parts 83 for holding the lower part of the contact 65 are formed.

As shown in FIG. 7, the contact point 65 is for fixing to an L-shaped bent contact part 91, an elastically expandable part 92 that is elastically expanded and contracted, and a lower holding part 83 of a holding frame 80. It has a lower fixing portion 93 and a soldering portion 94 for soldering to a circuit board (not shown). The contact portion 91 is provided with a plurality of protrusions 91A. The upper stretchable portion 92 and the lower stretchable portion 92, which are divided into the upper and lower portions of the vertically long portion, are bent so as to have a long length and are formed so as to obtain sufficient elasticity. When the top plate 2 is attached to the housing 1, the projections 91A of the contact portions 91 come into contact with the connection portions 51 to 56 on the lower surface of the top plate 2 shown in FIG. 4 to obtain a reliable connection state. Further, holes 96 and 97 are formed in the upper and lower regions of the stretchable portion 92 so that sufficient stretchability can be obtained. A tongue piece 99 is formed between the holes 96 and 97 at the center of the contact 65. The contact 65 is made of a plate material (thickness is, for example, 0.15 mm) having a spring property, such as phosphor bronze, beryllium copper, and stainless steel. When phosphor bronze or beryllium copper is used, nickel plating is applied to the entire surface as a surface treatment. Particularly, it is desirable that the upper contact portion 91 be plated with gold. Since the soldering portion 94 at the lower end portion is inserted into the circuit board and soldered, it is desirable to perform tin plating.

When the contact 65 is attached to the holding frame 80 as shown in FIG. 6A, the contact 65 is inserted from above the holding frame 80 with the fixing portion 93 facing downward. At this time, the protrusion 82 is inserted into the hole 96. Next, the fixing portion 93 is pushed into the lower holding portion 83. Further, as shown in FIG. 6B, the tongue piece 99 is inserted into the pocket 86 of the holding frame 80.
As a result, the contact points 65 are supported by the protrusions 82 so that they can be moved slightly forward, backward, leftward and rightward. Fixed part 93
Is held by the lower holding portion 83, so that it does not come off. As described above, the contact 65 is attached to the holding frame 80 by holding the upper hole 96 by the protrusion 82, holding the lower fixing portion 93 by the lower holding portion 83, and engaging the tongue 99 with the pocket 86. Therefore, since the mounting process is simple, the workability of assembly is good and the manufacturing cost can be reduced.
When a force is applied to the contact portion 91 in the vertical direction in the figure, the expansion / contraction portion 92 of the contact point 65 bends and contracts, but since it is held by the protrusion 82, the contact portion 91 does not move substantially in the front / rear / left / right directions. Move only in the direction. Also, the central portion 9 of the contact point 65
8 is held by the tongue piece 99 that has entered the pocket 86, and the movement in the left-right direction in the drawing is restricted. Therefore, when the contact portion 91 is pushed and the expansion / contraction portion 92 bends, the central portion 98 does not move. As a result, the contact portions 91 can be prevented from tilting, and reliable contact between each contact portion 91 and the connection portions 51 to 56 on the lower surface of the top plate 2 is maintained.

Next, the operation of the upper surface operation section 30 of this embodiment will be described. When the user heats and cooks in the induction heating cooker using the upper surface operation unit 30, first, the user touches the operation pad 32 or 35 to turn it on. Next, the operation pads 31, 3
Touch 3 or 34, 36 to adjust to desired firepower. Since the operation pads 31 to 36 are formed of a conductive film,
For example, if you touch a part of the operation pad 31 with the tip of your finger,
A change in capacitance is reliably generated between the entire surface of the conductive film of the operation pad 31 and the detection portion 41 on the lower surface 2B of the top plate 2. Therefore, the electrostatic capacitance between the operation pad 31 and the detection unit 41 is not affected by how the finger is touched.

In this embodiment, the operation pads 31 to 36 are used.
It is also possible to print only the operation region by printing with a non-conductive paint without providing a conductive film. In this case, the detection sensitivities of the detection units 41 to 46 are increased so that the tip of the finger lightly operates the operation region (the detection units 41 to 41 of the upper surface 2A of the top plate 2).
It is possible to operate just by touching (the area facing 46). In the present embodiment, the connecting portions 51 to 56 are provided at a position that is away from the front portion F of the top plate 2 by a predetermined dimension and away from the user. Therefore, the user can
It is rare to touch the upper surface of the opposing top plate 2 above the incorrect connection of 6. Therefore, even if the detection sensitivity is set high, there is no risk of erroneous operation.
Even if the user approaches the top plate above the connection parts 51 to 56 with a finger or touches the tip of the nail very lightly, the area of the connection parts 51 to 56 is half the area of the detection parts 41 to 46. Since it is made as small as 1 to 1/3, the electrostatic capacity is small and it is possible to avoid erroneous operation.

A description will be given with reference to FIGS. 8 and 9 of a case where a contact member made of a conductive elastic material such as conductive rubber is used instead of the metal contacts 61 to 66. FIG. 8 is a perspective view of the holding frame 100 when the contact member 120 made of conductive rubber is used. In the figure, a holding frame 100 has a plurality of holes 101, 102, 103, 10 each having a rectangular section (six in FIG. 8).
4, 105 and 106 are formed. Holding frame 100
The circuit board 110 is attached to the lower surface of the. Various electronic components (not shown) are attached to the circuit board 110. The circuit board 110 has rectangular conductive portions 111 to 116 formed of a metal film or foil. Holding frame 1
When the circuit board 110 is attached to the lower surface of the conductive sheet 111, the conductive portions 111 to 116 are positioned at the bottoms of the holes 101 to 106, respectively.

FIG. 9A is a perspective view of the contact member 120 made of conductive rubber. The contact material 120 is a square column of conductive rubber, and two cavities 121 and 122 are formed in the central portion. For example, three protrusions 125 are provided on the upper surface of the contact material 120.
And a groove 126 is formed near the lower end.
FIG. 9B shows the contact material 120 with the holes 10 of the holding frame 100.
9 is a sectional view taken along line IXb-IXb in FIG. The rib 127 provided near the lower end of the hole 101 enters the groove 126 of the contact material 120 to prevent the contact material 120 from falling off. The lower end of the contact material 120 is the circuit board 110.
Contacting the conductive portion 112 of the contact member 120 and the circuit board 110.
Are electrically connected. The protrusions 12 of each contact material 120
When the top plate 2 is attached to the housing 1, 5 comes into contact with the connecting portions 51 to 56 on the lower surface of the top plate 2 as shown in FIG. 9C. When the contact material 120 is pushed by the top plate 2, as shown in FIG. 9C,
Bends at the cavities 121 and 122. Due to the elastic force due to this, the connection portions 51 to 56 of the top plate 2 are connected to the circuit board 110. For the contact material made of conductive rubber,
Since it is easier to handle than the contact point 65 made of a leaf spring, the assembling work becomes easy.

[0029]

According to the present invention, the following effects can be obtained. According to the invention of claim 1, since the connection portion of the conductor is provided so as to be located away from the detection portion in the direction away from the user, the user touches the surface of the top plate facing the connection portion. This reduces the risk of accidental operation. According to the second aspect of the invention, since the operation region is formed of a non-conductive material, it is inexpensive, has a high degree of freedom in color and the like, and has good visibility. According to the invention of claim 3, the connection portion is provided on the lower surface of the top plate at a position away from the edge of the top plate facing the user and at a position away from the detection portion. Therefore, there is little risk that the user will accidentally touch the upper surface of the top plate facing the connection portion, and erroneous operation is unlikely to occur. According to the invention of claim 4, since the area of the detection unit is substantially equal to the area from the tip of the index finger of the person to the first joint, the operation area is limited to the range of the thickness of the finger, Even if you touch other areas, it is difficult for erroneous operations to occur. According to the invention of claim 5, since the conductive film is provided in the operation area, the operation area does not easily change depending on how the finger touches.

According to the invention of claim 6, since the area of the connecting portion is in the range of ½ to ⅓ of the area of the detecting portion, the surface of the connecting portion facing the top plate is touched. It is difficult for erroneous operation due to. According to the invention of claim 7, since the separation distance between the detection part and the connection part is longer than the dimension of the detection part in the front-rear direction, the user faces the top plate of the connection part in a normal use state. It is hard to touch the surface. According to the invention of claim 8, since the connection terminal has the plurality of protrusions on the contact surface with the connection portion, reliable contact can be obtained.

According to the ninth aspect of the present invention, since the connection terminal has a spring structure having a bent portion so as to have elasticity in a direction perpendicular to the surface of the top plate, a small amount of space is provided between the top plate and the housing. Reliable contact can be obtained even if there is a dimensional error. According to the tenth aspect of the present invention, since the operation portion is conductive, it is possible to perform a reliable operation that is unlikely to be affected by how strongly a finger touches. According to the invention of claim 11, since the connection terminal is a metal leaf spring, a reliable connection can be obtained by the pressure of the spring. According to the invention of claim 12, since the connection terminal is made of conductive rubber, the assembling work is easy. Claim 1
According to the third aspect of the invention, since the induction heating coil is used for the heating section to perform induction heating, the heating section and the operation area can be on the same plane or substantially on the same plane, which improves the cleanability and the operability. It is possible to make a cooker that is easy to use and does not easily malfunction.

[Brief description of drawings]

FIG. 1 is a plan view of a heating cooker according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the heating cooker according to the embodiment of the present invention.

FIG. 3 is a plan view showing an operation unit on the top surface of the top plate in the heating cooker according to the embodiment of the present invention.

FIG. 4 is a plan view showing a detecting portion and a connecting portion on the lower surface of the top plate in the heating cooker according to the embodiment of the present invention.

FIG. 5 is a perspective view of an upper operation circuit portion of the heating cooker according to the embodiment of the present invention.

6 (a) is a partial perspective view of the upper operation circuit section of FIG. (B) is a cross-sectional view taken along the line IVb-VIb of the upper operation circuit section in FIG.

FIG. 7 is an enlarged perspective view showing the detailed structure of the contact shown in FIG.

FIG. 8 is a perspective view of an upper operation circuit portion of another example of the heating cooker according to the embodiment of the present invention.

9A is a perspective view of a contact member used in the upper surface operation circuit of FIG. 8, FIG. 9B is a sectional view of the contact member used in the upper surface operation circuit of FIG. 8, taken along line IXb-IXb of FIG. Cross-sectional view showing the state of the contacts when attached to the housing

[Explanation of symbols]

1 housing 2 top plate 2A upper surface 2B bottom surface 3 pots 4,5 heating body 7 Temperature sensor 8 pan detector 10 Control unit 11 Inverter section 12 rotating panels 21, 22, 23 heating area 24, 25 yen 30 Top operation part 31-36 Operation pad 37, 38, 39 Transparent part 41-46 Detector 51-56 Connection 51A-56A connection conductor 60 Top operation circuit section 61-66 contacts 71,72 Backlight part 75,76 Light emitting part 80, 100 holding frame 81A-81F cells 82 Projection 83 Lower part 86 pockets 91 Contact part 91A, 125 protrusions 92 Flexible part 93 Lower fixed part 94 Soldering part 96, 97 holes 98 central part 99 tongue 101-106 holes 110 circuit board 111-116 Conductive part 120 contact materials 121, 122 cavity 126 groove 127 ribs

Claims (13)

[Claims] 1. A top plate of an electrically insulating plate member provided on an upper surface of a housing, a heating unit for heating an object to be heated, a control unit for controlling the heating unit, and a command input to the control unit. Operated by the user,
At least one operation area set on the upper surface of the top plate, a detection part of a conductor provided on the back surface of the top plate so as to face each of the operation areas, and the top plate connected to the detection part by a conductor. On the back surface of the connection part of the conductor provided so as to be located away from the detection part in a direction away from the user, and a connection terminal that contacts the connection part and electrically connects the detection part and the control part Cooker with. 2. The cooking device according to claim 1, wherein the operation area is made of a non-conductive material. 3. A top plate of a non-magnetic and electrically insulating plate-like member provided on the upper surface of the housing for placing the object to be heated, and the object to be heated provided in the housing below the top plate. A heating section for heating the heating section, a control section for controlling the heating section, a user operates the control section to operate at least one operation area set on the upper surface of the top plate, and a lower surface of the top plate. A detection unit that is provided in a region facing each of the at least one operation region and that is configured to detect an approach of a human body to the operation region by a capacitance change, and is connected to the detection unit by a conductor. A connection part made of a conductor provided on the lower surface of the top plate at a position away from the detection part in a direction away from the edge of the top plate facing the user, and In contact with the serial connection part,
A heating cooker having a connection terminal for transmitting an electric signal of the detection unit to the control unit. 4. The heating cooker according to claim 1, wherein an area of the detection unit is substantially equal to an area of a region from a tip of a human index finger to the first joint. 5. The cooking device according to claim 1, wherein a conductive film is provided in the operation area. 6. The heating cooker according to claim 1, wherein the area of the connecting portion is in the range of ½ to ⅓ of the area of the detecting portion. 7. The heating cooker according to claim 1, wherein a distance between the detection unit and the connection unit is longer than a dimension of the detection unit in the front-rear direction. 8. The connecting terminal has a plurality of protrusions on a contact surface with the connecting portion.
The cooker described. 9. The heating cooker according to claim 1, wherein the connection terminal has elasticity to expand and contract in a direction perpendicular to the surface of the top plate. 10. A top plate of a non-magnetic and electrically insulating plate-like member provided on the upper surface of the housing for placing the object to be heated, and the object to be heated provided in the housing below the top plate. A heating unit for heating the heating unit, a control unit for controlling the heating unit, a user operating the control unit to operate at least one operation unit provided on the upper surface of the top plate and having conductivity, the top plate A detection part of a conductor, which is provided in a region facing the at least one operation part on the lower surface of the body, for detecting the contact of a human body with the operation part by a capacitance change, and is connected to the detection part by a conductor. , A contact portion of a conductor provided on the lower surface of the top plate at a position away from the detection portion in a direction away from the edge of the top plate facing the user, and the connection portion Cooking device having a connection terminal for transmitting an electrical signal of the detection unit to the control unit. 11. The heating cooker according to claim 1, 3, 8, 9 or 10, wherein the connection terminal is made of a metal leaf spring. 12. The heating cooker according to claim 1, wherein the connection terminal is made of conductive rubber. 13. The induction heating coil as at least one heating unit, and the control unit supplies a high-frequency current to the induction heating coil to heat an object to be heated. Heating cooker.