JP2003303673A - Touch key and electromagnetic cooker using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch key capable of a safe operation without destruction or malfunction even if a person with a static may touch an electrode part, for one used for various kinds of electric equipment, especially, an electromagnetic cooker. <P>SOLUTION: By constituting of a plate part made of an electric insulator, an electrode part fitted on front and rear faces of the plate part, a conductive path fitted on either of the electrodes and arranged in the vicinity of an object on a grounding potential, a reliable touch key can be provided without destruction or malfunction even if a person with a static may touch an electrode part. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch key provided on a plate portion which constitutes a flat panel of various devices, particularly a device having a flat panel such as an electromagnetic cooker, and an electromagnetic cooker having the touch key. .

[0002]

2. Description of the Related Art Conventionally, touch keys of this kind have been proposed, for example, as shown in FIGS. FIG. 8 is a view as seen from the side of the touch key, and 1 is a plate portion of a flat electric insulating material such as glass. Reference numerals 23 and 24 denote electrode portions provided at opposing positions of the plate portion 1, and the electrode portions 23 and 24
And the plate portion 1 form a capacitor. Reference numeral 8 denotes a contact electrode portion that contacts the electrode portion 24 provided on the back side of the plate portion 1 and transmits the signal voltage level when the front electrode 23 of the plate portion 1 is touched with the finger 6 to the control circuit portion 5. The control circuit unit 5 sends a high frequency voltage to the electrode unit 24, and when the electrode unit 23 is touched with the finger 6, the high frequency voltage is bypassed through the electrode unit 24, the plate unit 1, the electrode unit 23, and the finger 6, and the electrode unit 24
It is to detect that the voltage appearing on the electrode 23 is lowered and to touch the electrode portion 23.

FIG. 9 shows an example in which touch keys are applied to an electromagnetic cooker, 1 is a plate portion made of glass or the like, and 7 is a housing. Reference numeral 25 is a front side electrode of a plurality of touch keys provided on the plate portion 1.

1a is a pot holder provided on the plate portion 1,
A pot is placed here, and an eddy current is applied to the pot from a coil portion (not shown) below the plate portion 1 to heat the pot and cook the food in the pot.

[0005]

However, in such a structure, when the human body is charged, this charging voltage is discharged from the finger 6 to the electrode portion 23 and controlled through the electrode portion 24 and the contact electrode portion 8. The control circuit section 5 is applied to the circuit section 5
There was a problem of destroying.

[0006]

In order to solve the above-mentioned problems, the present invention brings one of the electrode parts provided on the front side or the back side of the plate part close to an object at the ground potential, and the charged finger acts as an electrode. Even when the electrodes approach and are discharged to the electrodes, the high voltage is discharged to the object at the ground potential so that the high voltage is not applied to the control circuit section.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a plate portion made of an electrically insulating material, electrode portions provided on the front and back sides of the plate portion, and a conductive path provided on either one of the electrode portions. Since this part and this conductive path part are arranged close to the object at ground potential, the electrode part can be arranged at a predetermined position and a highly reliable touch key that does not affect the control circuit part even if static electricity is applied. realizable.

According to the second aspect of the present invention, the electrode portion has a predetermined area per unit length, and the conductive path portion is set smaller than the area of the electrode portion per unit length. It is possible to realize a touch key that does not malfunction even if you touch the upper part of the plate surface that passes through.

According to the third aspect of the present invention, since the conductive path is arranged close to the metal casing, even if a high voltage is applied to the electrodes, the high voltage is discharged to the casing, and the control circuit section is formed. It is possible to realize a highly reliable touch key in which a high voltage is not applied to the touch key.

According to the fourth aspect of the present invention, a plurality of pairs of electrode portions having a pair of front and back surfaces are provided, a conductive region is provided between the respective electrode portions, and the conductive region portion is set to the ground potential. It is possible to realize a highly reliable touch key that does not affect the touch of the electrode.

According to a fifth aspect of the invention, an electrode section, a control circuit section for inputting a signal from the electrode section, an auxiliary electrode section electrically connected to the electrode section, and a contact with the auxiliary electrode section are provided. A contact electrode portion for inputting a signal from the electrode portion to the control circuit portion, the auxiliary electrode portion is formed in a narrow strip shape, and the contact electrode portion has a width intersecting with the auxiliary electrode portion. Since it is configured with a narrow strip shape, there is no malfunction even if the panel part above the auxiliary electrode part is touched, and the contact electrode part of the control circuit part and the electrode part of the plate part contact even if the position of the plate shifts to some extent. It is possible to realize a highly reliable touch key that is maintained.

According to a sixth aspect of the present invention, an electrode portion, a control circuit portion for inputting a signal from the electrode portion, an auxiliary electrode portion electrically connected to the electrode portion, and a contact with the auxiliary electrode portion are provided. However, since the auxiliary electrode section has a strip shape, it has a contact electrode section for inputting a signal of the electrode section to the control circuit section, and therefore a malfunction occurs even if the plate section above the auxiliary electrode section is touched. It is also possible to realize a highly reliable touch key in which the contact electrode portion of the control circuit portion and the electrode portion of the plate portion are kept in contact with each other even if the position of the plate is displaced to some extent.

According to a seventh aspect of the present invention, there is provided a first electrode section for controlling turning on / off of a power source and second and third electrode sections for changing a temperature setting or inputting another control signal. Since the contact time of the first electrode unit that receives the power-on signal is set longer than the contact time of the second or third electrode unit that receives other control signals, safety is ensured that the power is not accidentally turned on. It is possible to realize touch keys with high cost and easy operation.

According to the invention described in claim 8, since the electromagnetic cooker has the touch key according to any one of claims 1 to 7, an electromagnetic cooker excellent in operability and easy to use is provided. Can be provided.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same components as those of the conventional example are denoted by the same symbols, and description thereof will be omitted.

(Embodiment 1) This embodiment is shown in FIGS.
Will be explained. FIG. 1 is a side view of the touch key according to the present invention, and FIG. 2 is a view seen from the back of the plate portion 1, and the electrode portion 3,
The conductive path portion 4 is shown. Reference numeral 2 denotes an electrode portion provided on the front side of the plate portion 1 made of glass or the like, which can be touched with a finger 6. Reference numeral 3 denotes an electrode portion provided on the back side of the plate portion 1 so as to face the electrode portion 2. The electrode portion 2, the plate portion 1, and the electrode portion 3 are provided.
The capacitor is composed of. The electrode portion 3 is in contact with the contact electrode portion 8 and sends a signal to the control circuit portion 5 when the electrode portion 2 is touched by the finger 6. Reference numeral 4 denotes a conductive path portion connected to the electrode portion 3, which has a smaller area per unit length than the electrode portion 3.

With the above construction, when the user of the touch key wears a sweater or the like and is charged with static electricity, the charging voltage is discharged to the electrode portion 2 when the charged finger 6 is brought close to the electrode portion 2, The voltage is discharged from the electrode portion 3 through the conductive path portion 4 to the metal casing 7 and does not affect the control circuit portion 5. Although the conductive path portion 4 is discharged to the metal casing 7, it may be discharged to another object at the ground potential. Further, by narrowing the width of the conductive path portion 4, when the plate portion 4a above the conductive path portion 4 is touched with the finger 6, the conductive path portion 4 and the plate portion 1 and the finger 6 are formed. The capacitance of the capacitor can be reduced, and even if the 4a portion of the plate portion 1 is touched, it is not detected and malfunction can be prevented.

(Embodiment 2) A second embodiment of the present invention is shown in FIG.
Shown in. FIG. 3 is a view of the plate portion 1 viewed from the back side, and there are three electrode portions 9, 10 and 11 provided on the back side, and the electrode portions 9, 10 and 11 are located at positions facing each other with the plate portion 1 interposed therebetween. Each has three electrode portions (not shown), and constitutes three sets of touch keys. A conductive region is provided between the electrode portions 9, 10 and 11 and is set to the ground potential. With the above configuration,
When the counter electrode on the front side of the electrode portion 9 is touched, the voltage change generated in the electrode 10 on the adjacent side can be reduced,
It is possible to prevent the operation of detecting that the touch key formed of the electrode 10 is touched without being touched.

(Embodiment 3) FIGS. 4 and 5 show a third embodiment. FIG. 4 is a view of the plate portion 1 viewed from the back side, showing the electrode portion 1
A strip-shaped auxiliary electrode portion 14 is connected to the electrode 3 and the electrode portion 13. Reference numeral 15 is a strip-shaped contact electrode portion connected to the control circuit portion 5 and intersects the auxiliary electrode portion 14.

With the above structure, when the plate portion 14a above the intersection of the auxiliary electrode portion 14 and the contact electrode portion 15 is touched with a finger, the intersection of the auxiliary electrode portion 14 and the contact electrode portion 15, the plate portion 1, the finger portion Since the capacitance value of the capacitor constituted by is small, the voltage change when touched with a finger is small, and even if the plate portion 14a is touched, it is not recognized as touched, and malfunction can be prevented. Further, since the auxiliary electrode portion 14 is long in a strip shape and the contact electrode portion 15 is also long in a strip shape, even if the installation position of the plate portion 1 is deviated, the contact between the electrode portion 14 and the contact electrode portion 15 is maintained and operates reliably.

In the auxiliary electrode section 14, the contact electrode section 15 connected to the control circuit section 5 comes into contact with the auxiliary electrode section 14,
In order to take out the signal indicating whether or not the front electrode portion 16 is touched,
This is necessary because of the positional relationship between the electrode section 16 and the control circuit section 5, the positional relationship with the housing 7, and the positional relationship with other obstacles. It will increase.

(Embodiment 4) FIG. 6 shows a fourth embodiment of the present invention. In FIG. 6, the auxiliary electrode portion 18 is formed in a strip shape, the area of the auxiliary electrode portion 18 is small, and the contact with the contact electrode portion 19 is more reliable.

(Fifth Embodiment) FIG. 7 shows a fourth embodiment of the present invention. Numerals 20, 21, and 22 are electrode portions provided on the front side of the plate portion 1, 20 is a touch key for controlling power on / off, 21 is a touch key for setting a high temperature setting level, and 22 is a low temperature setting level. Touch key to set. When the touch key 20 is touched, the control circuit unit 5
Recognizes that the touch key 20 is touched when the touch key 20 is continuously touched for a predetermined time t1, and turns on the power. Further, when the touch keys 21 and 22 are touched to change the temperature setting level, the touch key 21 and 22 are recognized as touched for a predetermined time t2, and t1> t2 is set.

With the above configuration, it is possible to realize a touch key which can reduce the risk of accidentally turning on the power and can set the temperature setting level lightly. Further, by using this touch key in an electromagnetic cooker, it is possible to provide an electromagnetic cooker that is highly safe and easy to use at home.

[0025]

As described above, according to the invention described in claims 1 to 3 of the present invention, it is possible to provide a touch key which can be stably operated without being destroyed or malfunction even when static electricity is applied to the electrode portion. You can

According to the fourth and fifth aspects of the invention, there is no malfunction even if the plate portion above the auxiliary electrode portion for signal extraction provided separately from the electrode of the touch key is touched, and the installation position of the plate is kept. It is possible to provide a touch key that is stable in operation and does not cause poor contact even when it is displaced.

Further, according to the invention described in claim 7, since the reception time of power-on is set longer than the reception time of the touch key of other control, there is no danger of accidentally turning on the power. Touch keys can be provided.

Further, according to the invention described in claim 8, since the electromagnetic cooker has the touch key according to any one of claims 1 to 7, it is excellent in operability, safety and stable. It is possible to provide an easy-to-use electromagnetic cooker.

[Brief description of drawings]

FIG. 1 is a side view of a touch key according to a first embodiment of the present invention.

FIG. 2 is a plan view of the electrode section seen from the back surface of the plate section of the touch key according to the first embodiment of the present invention.

FIG. 3 is a plan view of an electrode portion viewed from the back surface of the plate portion of the touch key according to the second embodiment of the present invention.

FIG. 4 is a plan view of an electrode portion and a contact electrode portion as seen from the back surface of the plate portion of the touch key according to the third embodiment of the present invention.

FIG. 5 is a side view of the touch key according to the third embodiment of the present invention.

FIG. 6 is a plan view of an electrode portion viewed from the back surface of the plate portion of the touch key according to the fourth embodiment of the present invention.

FIG. 7 is a plan view of an electrode portion viewed from the surface of the plate portion of the touch key according to the fifth embodiment of the present invention.

FIG. 8 is a side view of a conventional touch key example.

FIG. 9 is a perspective view showing an example in which touch keys are used in an electromagnetic cooker.

[Explanation of symbols]

1 plate part 2, 3, 9, 10, 11, 13, 16, 17, 20, 2
1, 22, 23, 24, 25 Electrode section 4 Conductive path section 7 Housing 12 Conductive area section 14, 18 Auxiliary electrode section 15, 19, 8 Contact electrode section 5 Control circuit section

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kiyoshi Yoshida             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3K051 AC22 AD08 AD24 AD28 CD24                       CD43

Claims (8)

[Claims] 1. A plate part made of an electrically insulating material, electrode parts provided on the front and back sides of the plate part, a conductive path part provided on either one of the electrode parts, and the conductive path part being grounded. Touch keys placed close to objects in. 2. The touch key according to claim 1, wherein the electrode portion has a predetermined area per unit length, and the conductive path portion is set smaller than the area of the electrode portion per unit length. 3. The touch key according to claim 1, wherein the conductive path portion is arranged close to a metal casing. 4. A plurality of sets of electrode portions each having a pair of front and back sides are provided,
A touch key in which a conductive region is provided between the respective electrode parts, and the conductive region is used as a ground potential. 5. An electrode portion, a control circuit portion for inputting a signal from the electrode portion, an auxiliary electrode portion electrically connected to the electrode portion, and a signal of the electrode portion which is in contact with the auxiliary electrode portion. And a contact electrode portion for inputting to the control circuit portion, the auxiliary electrode portion is formed in a narrow strip shape, and the contact electrode portion is formed in a narrow strip shape that intersects with the auxiliary electrode portion. Touch key. 6. An electrode section, a control circuit section for inputting a signal from the electrode section, an auxiliary electrode section electrically connected to the electrode section, and a signal of the electrode section that is in contact with the auxiliary electrode section. And a contact electrode portion for inputting to the control circuit portion, and the auxiliary electrode portion is formed in a strip shape. 7. A power-on signal is received by having a first electrode part for controlling power on / off and second and third electrode parts for changing a temperature setting or inputting another control signal. A touch key in which the contact time of the first electrode unit is set longer than the contact time of the second or third electrode unit that receives another control signal. 8. An electromagnetic cooker having the touch key according to claim 1.