JPS6215999B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking appliance equipped with a microcomputer, and particularly to an operation switch section for adjusting the time on the time display section thereof. The goal is to prevent

Cooking appliances such as high-frequency heating devices equipped with microcomputers have been put into practical use and are attracting attention, but the ones currently in practical use have the configuration shown in FIG. 8, and therefore have the following drawbacks.

That is, in FIG. 8, 1 is a time display section, and the time adjustment operation switch 1a of this time display section 1 is also composed of a touch key, and this touch key, like the other touch keys 2, is provided on the touch panel 3. There is.

Therefore, while operating each touch key 2 to input cooking time and cooking output, a finger or a part of the body may touch this operation switch 1a, or an animal such as a cat or mouse may touch this operation switch 1a. Every time you touch it, the time on the time display section 1 becomes incorrect.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks of the conventional technology by constructing a mechanical operation switch for adjusting the time and providing the operation switch outside the touch panel.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a high-frequency heating device will be described below with reference to the accompanying drawings.

In Fig. 1, 4 is the main body of the high-frequency heating device;
A heating chamber 5 is provided within the main body 4, and a door 6 equipped with a door screen 6a is provided at the front opening of the heating chamber 5 so as to be openable and closable.

Further, an operation panel A is provided on the side of the door 6, and a touch panel 7, a stop switch 8, a start switch 9, a time display section 10, a cooking lamp 11, etc. are attached to this operation panel A.

Of these, the touch panel 7 includes a touch key 7a for inputting cooking output, a touch key 7b for inputting cooking time, and a touch key 7 for resetting.
c is provided.

The electrical equivalent circuits of these touch keys 7a, 7b, and 7c are shown in FIGS. 3 and 4.

That is, two capacitances C ₁ and C ₂ are formed in each touch key 7a, 7b, and 7c as shown in FIG. 4, and when the finger 12 touches the touch keys 7a to 7c as shown in FIG. capacitance as shown in
The electrostatic capacitance C ₃ of the body 13 is added to C ₁ and C ₂ . Then, until now, the electrode 1 from the driver circuit 14 in FIG.
As a result of adding the Vin signal in Fig. 4 to 5, this electrode 15
4, which was applied to the binary number converter 16 from the
The Vout signal becomes the V′out signal in the same figure.

This V'out signal is higher than the reference signal Vref, which will be described later.As a result, the binary number converter 16 determines which key switch 7a, 7b, 7c the finger 12 touched, and transmits that information to the microcontroller shown in FIG. The information is transmitted to the computer 17.

If the binary number converter 16 determines that the finger 12 has touched the key switch 7b for inputting the cooking time, the time display section 10, which has been displaying the time up until now, will display, for example, "6" as shown in FIG. :27" and the cooking time will be displayed.

In the above configuration, in the present invention, as shown in FIGS. 2 and 3, an operation switch 18 for switching the time display section 10 to the time correction mode is provided outside the touch panel 7, and this operation switch 18 is mechanically and specifically is configured to be operated by pushing.

As for the specific operation, by pressing the operation switch 18, a time correction mode switching signal is input to the microcomputer 17, the time displayed on the time display section 10 stops, and in this state Touch key 7 to input cooking time
The user touches the finger 12 on the button 12 to correct the time, and then presses the operation switch 18 again to start the time.

Therefore, according to this configuration, each touch key 7
This operation switch 1 is used when operating a, 7b, 7c, etc.
The finger 12 never touches the switch 8, and even if it does, the operation switch 18 will not be operated. Therefore, this time display section 10
The time will no longer be incorrect as in the past,
It will always display accurate time.

Furthermore, by providing the operation switch 18 for switching the time correction mode outside the touch panel 7, the reliability of inputs from the touch keys 7a, 7b, and 7c can be increased.

In other words, the currently available binary converter 16
As shown in FIG. 3, there are 6 to 9 input terminals 16a.
Therefore, the key switches 7a, 7
There are considerably more input terminals b and 7c than this input terminal 16a, and it is naturally impossible to make one input terminal 16a correspond to one key switch, for example, 7a.

For this reason, two electrodes 15 are provided on the back surface of each touch key 7a, 7b, 7c, as shown in FIG.
and each input terminal 16a must correspond to two touch keys as shown in FIG. In this case, in order to distinguish between touch keys input to the same input terminal 16a, two driver circuits 14', 14'' are provided as shown in this figure. As shown in Figure 5, the V _1io signal and V
_2io signals are output, and the signals V _1io and V _2io are compared with the reference signal Vref, thereby distinguishing the touch keys.

In such a configuration, the touch keys 7a, 7
If we increase the number of electrodes b and 7c, two electrodes 15 and driver circuits 14' and 14'' will not be enough, and we will need one more.
(not shown) are required.

In this case, even when the finger 12 is not touching the touch keys 7a, 7b, 7c as shown in FIG.
The capacitance C ₄ due to the provision of three electrodes 15,
_C5 and the stray capacitance _C6 of the touch panel 7 are grounded. Therefore, as shown in the figure, the Vout signal to the binary converter 16 becomes low.
The Vout signal approaches the reference signal Vref.

This makes it difficult to compare the Vout signal and the reference signal Vref, and as a result, malfunctions are more likely to occur.

On the other hand, if the number of electrodes 15 is reduced to two without increasing the number of touch keys 7a, 7b, and 7c, the capacitance _C5 shown in FIG. 6 will disappear as shown in FIG.
Since the Vout signal becomes higher by that much, malfunctions are less likely to occur.

In other words, if the operation switch 18 for switching the time adjustment mode is provided outside the touch panel 7 as in the present invention, the above-mentioned touch keys 7a, 7b, 7c
As a result, the reliability of the touch keys 7a, 7b, 7c input is increased as described above.

As described above, the present invention provides a mechanical operation switch for adjusting the time outside the touch panel.
The following effects can be obtained.

(1) By separating the time adjustment switch from the touch key operation surface when operating the touch keys, it is possible to prevent the touch keys from being touched carelessly and causing the time to go out of order, and also to prevent small animals such as cats and mice from touching the touch keys. This can prevent malfunctions caused by touching.

(2) Separating the time adjustment switch from the touch key operation surface improves the reliability of key input (noise resistance, resolution) by improving the key resolution of the touch keys as the number of keys decreases. be able to.

(3) By making the correction operation switch separate and independent from the touch key operation surface, it is possible to provide an uneven guard around the operation key, further improving the function to prevent erroneous operation and malfunction. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view to which a configuration according to an embodiment of the present invention is applied, FIG. 2 is an enlarged perspective view of the main part of the same device,
Figures 3 and 4 are electrical circuit diagrams of the main parts of the device, and Figure 5
6 and 7 are diagrams used to explain the configuration of the device, and FIG. 8 is an enlarged perspective view of the main part of the conventional example. 7... Touch panel, 7a, 7b, 7c... Touch key, 10... Time display section, 18... Operation switch.

Claims (1)

[Claims] 1 The cooking time, the cooking output, and the time on the time display section are controlled by a microcomputer, and the cooking time, cooking output, and time are input to the microcomputer using a plurality of touch keys provided on the touch panel. . A cooking appliance which is provided with an operation switch outside the touch panel and near the time display section for inputting a time correction mode switching signal to the microcomputer.