JPS5916171B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high frequency heating device, a so-called microwave oven, using a microcomputer or the like in a control circuit.

Today, microwave ovens have become more multi-functional and sophisticated, and can not only control high frequency output, but also temperature control using thermistor sensors, etc., but they also use microcomputers in the control circuit, and have time display functions. It is equipped with a timer function, which allows the user to set the high frequency output and cooking time arbitrarily from the keyboard to perform cooking, or to cook with a specific cooking pattern.

As described above, the functionality of microwave ovens has expanded and become more sophisticated, and it has become possible to cook complex dishes, but on the other hand, the operability of microwave ovens has also become complicated for users.

The present invention aims to eliminate and solve the complications that appear in the operability of the microwave oven as described above, and to further improve its functionality.

FIG. 1 is an overall perspective view of an embodiment of the microwave oven.
1 is a microwave oven main body, 102 is a door provided on the front surface so as to be openable and closable, and has a handle portion 103 and a hook 104.

Reference numeral 105 denotes a keyboard operation section, which allows selection of high frequency output level, timer setting, control temperature level selection, clock setting, selection of a specific cooking pattern, etc.

106 is a numeric display section that displays a timer, a clock, a controlled temperature, etc.

107 is a time setting button, 108 is a cooking start button, and 109 is a cooking stop button.

Reference numeral 110 denotes a sensor probe which can be attached to and detached from a connection part provided on the wall of the V1 heating chamber 111.

Further, 112 is a hole for efficiently transmitting sound from a speaker or a buzzer built into the microwave oven main body 101 to the outside.

FIG. 2 is an enlarged view of the keyboard section 105, with 201 to 20
6 is a high frequency output selection key; 207 is a key for cooking with a specific cooking pattern; 208 is a key for clearing key input contents; 209 to 218 are numerical keys.

Further, the numerical keys 214 to 218 also serve as control temperature selection keys. Note that 219 to 228 are indicator lights that indicate the status.

Figure 3 is an electrical circuit diagram of the microwave oven of this embodiment.
1 is a power plug for connecting to a commercial power supply, 302 is a heat-sensitive switch installed inside the microwave oven main body 101, and 302 is a heat-sensitive switch installed inside the microwave oven main body 101. When it generates heat, it becomes open and cuts off the power supply. 303
is the first fuse, which melts and cuts off the power supply when a large current flows in the main circuit of the microwave oven due to a short-circuit failure of a component or the like.

A first door switch 304 is opened and closed by operating the handle portion 103 of the door 102.

305 opens and closes in conjunction with 304, and the control circuit 335
This is a door monitor switch for notifying the open/closed state of the first door switch 304.

306 is a second door switch, and 307 is a third door switch.

As shown in the figure, the third door switch 307 has two movable pieces 308 and 309 that move in conjunction with the opening and closing of the door.For example, the first and second door switches 304 and 306
and - If the movable piece 308 of the third door switch 307 causes welding or the like and the power supply does not stop even though the door 102 is opened, a short circuit current flows through the other movable piece 309 to the short circuit 310. , first fuse 30
3 to maintain safety. Contact 311,3
12 is linked to the push button 109,
When the stop button 109 is pressed during cooking, the normally closed contact 312 is opened, the holding circuit of the power relay coil 315 is forcibly cut off, and the power relay contact 316 is opened to cut off the power supply to the high voltage transformer 336 and the like. Also, normally open contact 311
is closed to notify the control circuit 335 that the stop button 109 has been operated. The contacts 313 and 314 are linked to the push operation of the cooking start button 108, and the normally open contact 313 closes to notify the control circuit 335 that the cooking start button 108 has been operated. Also, the normally open contact 314 is closed to supply power to the power relay coil 315. Further, when the cooking start button 108 is pressed and the normally open contact 314 is closed, a very large inrush current flows through the high voltage transformer 336, but the inrush current can be suppressed by the limiting resistor 317. 318 is a normally closed contact, which opens when voltage is applied to the coil 319 in response to the cooking completion signal from the control circuit 335, cutting off the holding circuit of the power relay coil 315 and closing the power relay contact 316.
is opened to cut off the power supply to the high voltage transformer 336, etc.

320 is an internal light for illuminating the heating chamber 111; 321
is a cooling fan drive motor for cooling electrical components and the like within the microwave oven main body 101.

A second fuse 322 prevents overcurrent from flowing to the control circuit 335.

323, 323/ are power input terminals to the control circuit 335.

324 is a normally open contact that is closed or closed when the time setting button 107 is operated, and serves to notify the control circuit 335 that the time setting button 107 has been pressed.

A thermistor 325 is installed at the tip of the sensor probe 110, and its resistance value changes depending on the temperature of the food or the like.

The sensor probe 110 is detachable via contacts 326 and 326/. 327 and 328 are normally open contacts that open and close when the sensor probe 110 is attached and detached, and when 327 is closed, an indicator light 228 indicating the temperature control mode is lit.

328 is a sensor probe monitor switch which, when closed, notifies the control circuit 335 that the sensor probe 110 is attached.

329 is a frequency changeover switch for switching depending on whether the commercial power supply frequency is 50Hz or 60Hz.

If the frequency of the power supply used by the product is predetermined, the frequency selector switch 329 can be used, for example, in the control circuit 3.
When two terminals on a printed wiring board of 35 are connected with a lead wire, it is 50Hz, and when 12 terminals are left open, it is 60
It is also possible to set it to Hz. 330 is a numerical display device that displays cooking time, time, temperature, etc. through the numerical display section 105.

331 is a sounding device such as a buzzer, a speaker, or a bell, and 332 is a selection switch for the user to select the sounding device 331.

333 is a coil for operating the high voltage switch 334, and according to a control signal from a control circuit 335, the high voltage switch 334 is turned on and off, and the power supply to the magnetron 340 is turned on and off.

Therefore, the high frequency output supplied from the magnetron 340 into the heating chamber 111 is controlled from 0N to 0FF by the control signal from the control circuit 335. 336 is an iron resonance type high voltage transformer, and 337 is a high voltage capacitor that forms a half-wave voltage doubler rectifier circuit together with a high voltage diode 338.

339 is a varistor for protecting the high voltage diode 338.

FIG. 4 is a block diagram showing the functions that constitute the control circuit 335. Reference numeral 401 is a MOSLSI called a microcomputer that has computer functions on one or several chips, albeit on a small scale.
This is the control section inside. 402 is a power supply section of the control circuit 335, and 403 is a pulse generator of commercial frequency of 50 Hz or 60 Hz.

404 is a signal from the keyboard 105 or 50/
This is an input section for inputting signals from the 60Hz pulse generator 403, the temperature control circuit 408, etc. to the MOSLSI 4Ol.

405 is a power relay drive circuit, 406 is a high voltage relay drive circuit, 407 is a sound generation circuit, 408 is a temperature control circuit, 409
410 is a status display circuit, and 410 is a numeric display circuit, each of which is controlled by an output signal from MOSLSI 4Ol.

FIG. 5 is an explanation of MOSLSI4Ol.

This example uses Texas Instruments' TMSLO.
OO was used as a MOSLSI microcomputer. MOSLSI4Ol has internal program memory (
ROM) and data memory (RAM),
When the user gives an input signal from the keyboard 105 or the like,
The input signals are input from input terminals 501 to 504, and are processed using a data memory (RAM) or the like according to the control procedure preprogrammed in the program memory (ROM), and the results are input to the input terminals 505 to 515 and 516 to 5
23 output terminals. The output terminals 505 to 515 can be controlled independently by a program, and the output terminals 516 to 523 can be controlled by a combination of all terminals.

Reference numerals 524 and 525 are a group of resistors connecting each output terminal and the DC power supply VDD, which are used to clarify the output level from each output terminal.

526 is a relatively accurate capacitor with little capacitance loss, such as a styrene capacitor, and along with the 527 resistor, M
The clock frequency of OSLSI4Ol is determined.

529 is an electrolytic capacitor, which creates a delay time when power is applied to MOSLSI4Ol and adjusts the internal state during that time. When the power is turned off, the charge accumulated in the electrolytic capacitor 529 is rapidly passed through the diode of 528. Discharged.

FIG. 6 is an explanation of the input section 404 shown in FIG. 4.

Output terminals 505 to 511 and 5 of MOSLSI4Ol
15 are sequentially scanned and outputted one by one by a program. Therefore, when the door monitor switch 305 is closed while an output is being output from the output terminal 515, the output signal from the already output terminal 515 will be changed to MOSL.
Input from input terminal 503 of SI4Ol, MOSLS
In I4Ol, the door 102 is closed and the door monitor switch 3 is turned on.
It can be seen that 05 is closed. Sensor probe monitor contact 328, frequency selection switch 329
, the time setting contact 324, the cooking start contact 313, and the cooking stop contact 311 as well.
l can determine the input content.

Next, input from the keyboard 105 will be explained. In this embodiment, the keyboard 105 is a touch type keyboard. As shown in a partial cross-sectional view in Figure 7,
Electrodes 201 to 21 are placed on the front and back of the glass keyboard 105.
8,621 to 638, 619, and 620 are provided, and key input is performed using the capacitances A and B formed between these electrodes and the capacitance 645 of the human body. That is, when an output signal is output from the output terminal 506 of MOSLSI4Ol, the signal voltage (VHH) at the terminal 619 changes from the terminal 621 depending on whether or not you touch the High key 201 of the high frequency output selection key with your finger. The rate at which the key is reached is different, and it is determined whether or not there is an input signal, that is, whether or not a key is touched. Next, 60 in Figure 6
1 is an input interface circuit whose contents are shown in FIG. When the High key 201 is pressed, an input signal is input to the (C1) terminal, and the buffer/latch section 646 outputs the comparison voltage VRE.
F and the already input signal are compared. Next, if an input signal is found as a result of the comparison, it is encoded by an encoder 647. Next, at multiplexer 648, 50/60H
Switches between the z pulse input F and the input signal. IS
Since no signal is currently coming to the R terminal, the encoded version of the input signal is output to the output terminals of Y1 to Y4, and this becomes the input signal of MOSLSI4Ol, and the High key 2
01 can be determined. Next, MOSLSI4
When an output is output to the output terminal 505 of the Ol, a signal is input from the ISR terminal, and the control unit 649 switches the multiplexer 648 to output the content from the F terminal (642 in FIG. 6), and the buffer/ Reset latch 646. Also, the input from the F terminal, that is, 50
The /60Hz pulse is output from the Y4 terminal as a 0,1 signal. The keys of other touch keys can be determined in exactly the same way. 613, 614 in Figure 6
are resistors connected to the bases of transistors 617 and 618, and resistors 615 and 616 are also connected to the collectors. When there is an output signal at the output terminal 506 or 508 of MOSLSI4Ol, 506 and 508 go to H level, so the transistors 617 and 618 are cut off, and the common electrodes 619 and 6 of the glass keyboard 105
A voltage VHH is applied to 20. Next, 6 in Figure 6
21-638 are output electrodes of each key 201-218. 640 is a resistor, 641 is a semi-fixed variable resistor, and RE? of the input interface circuit 601. Apply an appropriate comparison voltage to the pancreas.

639 is a signal input terminal from the temperature control circuit 408.

In FIG. 7, 643 is the electrode section 6 of the keyboard 105.
These are spring contacts for connecting terminals 19, 620 or 621 to 638 and a printed wiring board 644. The operation of the door monitor switch 305 will be explained with reference to FIG.

When the user tries to open the door 102, the handle part 10
3 and press the latch button 650, the crank 65
1 moves around the axis 652 as shown by the arrow. The hook 104 receives this movement and moves about the shaft 653 as shown by the arrow. The switch lever 654, which had been pressed by the hook 104, becomes free, and the door monitor switch 305 is also opened by the movement of the switch lever 654, causing the control circuit 335 to release the first door switch 304. You can let them know what has happened. Note that 655 is a mounting bracket. Next, referring to FIG. 10, a method will be described in which the sensor probe 110 is inserted from the wall of the heating chamber 111, the thermistor 352 is connected to the circuit, and the sensor probe monitor switch 328 and temperature control mode display switch 327 operate.

The thermistor 325 may be radio-shielded and attached to the tip of the sensor probe 110 (not shown), and lead wires from both ends thereof are connected to metal electrodes 656 and 658. 657 is an insulator between them.

Connection hole 6 on the wall of the heating chamber 111 of the sensor probe 110
60 , the metal electrode 656 is connected to the wall surface of the connection hole 660 and connected from the terminal 326 to the control circuit 335 . The other metal electrode 685 is connected as shown in the figure with a spring contact 661 having a spring property, and is connected to the control circuit 335 from the terminal 326'. Furthermore, when the sensor probe 110 is inserted, the switch lever 659 of the sensor probe monitor switch 328 or the temperature control mode display switch 327 is pushed by the tip of the metal electrode 658, the contact is closed, and the sensor probe 110 is inserted. can be notified to the control circuit 335. 662 is a mounting bracket.

Further, diodes 602 to 612 in FIG. 6 are used to prevent malfunctions that are reverse biased with respect to other signals.

Next, FIG. 11 is an explanation of the numeric display circuit 410.

In this embodiment, an example in which a fluorescent display tube 701 is used as a numeric display will be described. This fluorescent display tube 701 has 4
It consists of a 7-segment display of digits and a 1-digit colon display. 702 is a plate electrode consisting of 7 segments (a-g), the surface of which is covered with a fluorescent substance, and the 4-digit 7 segments (a-g) are arranged as shown in FIG.

Furthermore, the one-digit colon (H, i) is arranged as shown in FIG. 703 is a grid electrode, and 704 is a cathode electrode.

705 is a heater winding for heating the cathode, and 707 is a Zener diode, which maintains a constant voltage between the intermediate tap of the heater winding 705 and the DC power supply VKK.

707 is a driver circuit on the plate electrode 702 side, 708
is a driver circuit on the grid electrode 703 side, 709 is an inverter element on the plate electrode side, and TlO is an inverter element on the grid electrode side.

Based on the above configuration, if you want to light up the number "1" in the first digit, for example,
f) Just make the B and c segments shine. Therefore, B, C
When the plate electrode of is set to the ground level and the grid electrode of the first digit is also set to the ground level, the number "1" 5 lights up at the first digit.At this time, the output terminals 517 and 51 of MOSLSI4Ol
It is programmed to output H level to 8,508. Also, in order to light up the colon (H, i),
The H level is output to the output terminals 523, 509 of MOSLSI4Ol, and the colon plate electrodes H, i
and connect the coron grid 7035 to ground level. In addition, when making the colon (H, i) blink at a period of about 0.1 Hz, the output terminal 5 of the MOSLSI 4Ol
23,509 should be programmed to output an H level at a cycle of 0.1 Hz. FIG. 14 shows an embodiment of the status display circuit 409.

Now, for example, the High key 201 on the keyboard 105
When the key is input, the indicator light 221 of the High key 201
To turn on the output terminal 52 of MOSLSI4Ol.
When an H level output signal is output to 1, the inverter element 70
9, the drive transistor 801-1 for the High key indicator light 221 of the first drive circuit 801 is set to 0N.
, and at the same time output an H level output signal to the output terminal 511, the drive transistor 802-1 of the second drive circuit 802 becomes 0N, and the High key indicator light 22
1 lights up. The other cases are exactly the same, MOSLSI4
When a predetermined output signal is output to the output terminals 516-521 and 509-511 of Ol, the indicator light corresponding to the intersection on the matrix lights up. Also, as shown in FIG. 15, as in the case of the temperature control mode indicator light, MOSLSI4Ol
The indicator light 228 may be turned on or off depending on the open/closed state of the switch 327, completely unrelated to this. FIG. 16 shows an embodiment of the temperature control circuit 408, and 901 is a Schmitt circuit.

902 to 906 are temperature selection keys 21 of the keyboard 105
It is a resistor that sets the temperature corresponding to 4 to 218.

Now, when the sensor probe 110 is inserted, the temperature control mode is set, and the 1151F key 218 is pressed, the fluorescent display tube 70 will be displayed, for example, by the numerical display circuit shown in FIG.
Display the characters "115F"" on 1, and
When a high level output is output to the output terminal 516 of OSLSI4Ol, the resistor 902 is selected through the inverter element 709, and the voltage between the ground and the VDD voltage is connected to the thermistor 32.
5 and the voltage divided by the resistor 902 is input to the limit circuit 901. When the temperature of the food to be cooked is still low and has not reached the set temperature, the resistance value of the thermistor 325 is greater than the predetermined value, and the potential at the dividing point 911 is lower than the Schmitt circuit 9.
I haven't reached the point where I can invert 01. Eventually, as the temperature rises, the resistance value of the thermistor 325 decreases, so the potential at the dividing point 911 increases, the Schmitt circuit operates, and the N
AND gate 908 outputs H level. At this time MO
When the timing is set to output an H level to the output terminal 512 of the SLSI 4Ol, it is input as an input signal to the MOSLSI 4Ol through the inverter element 909 and the diode 910, and it is possible to notify the MOSLSI 4Ol that the set temperature has been reached. The same applies to other cases. Diodes 907-1 to 907-6 provide reverse bias to other signals to prevent malfunction. 1st
FIG. 7 shows an embodiment of the high voltage relay drive circuit 406.

The high voltage relay is for controlling high frequency output, and is 0
The high frequency output can be changed by changing the duty of N-0FF. For example, when the Medium key 223 of the high frequency output selection key is pressed to start cooking, from the output terminal 513 of the MOSLSI4Ol,
An H level output signal is intermittently output at a duty cycle corresponding to the Medium key 223. or,
By synchronizing the high voltage switch 334 with 50/60 Hz pulses and terminating them within specific phases, the life and reliability of the high voltage switch can be greatly increased. That is, a high voltage is applied to the magnetron 340 every half cycle by a half-wave voltage doubler rectifier power supply circuit in synchronization with a 50/60 Hz pulse. Therefore, magnetron 3
If the high voltage switch 334 is turned on and off during the half cycle when high voltage is not applied to the high voltage switch 40, the life and reliability can be increased. Therefore, using the D flip-flop 1002,
The duty output from the 513 output terminal of MOSLSI4Ol is synchronized with the 50/60Hz pulse from the 642 terminal, and the drive transistor 1006 is turned ON-OFF through the inverter element 1003, and the high voltage relay circuit 3
33 is controlled in synchronization with the commercial power supply. 1004,1
0051004 and 1005, the resistor 1007 is a diode for absorbing back pulses.

FIG. 18 shows an embodiment of the power relay drive circuit.

When the set cooking time is counted down and finished, or when the set temperature is reached, 51 of MOSLSI4Ol
An H level output signal is output from the fourth output terminal, turning the driving transistor 1103 ON and energizing the coil 319. 1101 and 1103 are resistors, and 1104 is a diode for absorbing back pulses.

FIG. 19 shows an embodiment of the sound generation circuit 407.

The sound generation circuit 407 generates a sound using the sound generation device 331 or the like to confirm the key input when the user inputs a key by touch operation on the keyboard 105, or when notifying the end of cooking. It can be used. An oscillation circuit 1201 oscillates at a certain predetermined audio frequency.

The inverter element 1204 is used for amplification.

1202 is a D flip-flop, MOSLSI4
When H level output signals are received from output terminals 515 and 523 of Ol, an H level output is output from the Q terminal.

1203 is a NAND element, D flip-flop 1
Output from 202 and output NA from oscillation circuit 1201
I am taking ND.

Now, when the output from the D flip-flop 1202 is always H, the output from the NAND element 1203 is
Since the output is equal to 1, repeat H-L at an audible frequency.
return. Now, when it is L, the transistor 1209 is 0FF.
Therefore, a resistor 1 is connected to the capacitor 1208 from the ground.
A current flows through the capacitor 207 to charge it, and when the transistor 1209 is high, the transistor 1209 becomes 0N, and the electric charge stored in the capacitor 1208 is discharged through the sound generating device 331, allowing the sound generating device 331 to produce sound. . 1205
, 1206 is a resistance.

Figure 20 shows an example of a 50/60Hz pulse generation circuit, in which commercial frequency AC is connected between input terminals 1301 and 1301/
When a voltage is applied, a half-wave pulse of a commercial frequency is generated by a transistor 1306 and a diode 1305, and further waveform shaping is performed by a transistor 1308.

642 is its output terminal.

1303, 1304, 1307, and 1309 are resistors.

FIG. 21 shows an example of attaching the glass keyboard 105 and printed wiring boards 644, 1407.

The glass keyboard 105 has a cushioning material 140 such as rubber around the peripheral edge.
3, and is fixed and attached with a grip part 1402 of a chassis 1401. Also, printed wiring boards 644, 14
07 has legs 1406, which are inserted into mounting holes 1405 provided in the chassis 1401 and fixed. or,
It is firmly tightened with a solid bottom screw 1409. Chassis 1
A cooling hole 1404 is provided in the cooling hole 401, but the diameter of this hole is cut off from the noise generated from the magnetron 340 and the like. Also, the rear part has a 140V lid for easy repair and inspection. 1408 is chassis 14
01 to the microwave oven main body 101.

FIG. 22 shows the mounting structure of the control section incorporated in the chassis 1401 in a horizontal cross section.

1410 is a frame body of the microwave oven body 101, and only the keyboard 105 portion is hollowed out.

As shown in the figure, the chassis 1401 is attached to the frame body 1410 with a mounting bracket 1408.
In the vicinity of the grip portion 1402, the frame 1410 is provided with a recessed portion 1411 inside the surface of the keyboard 105. 1412 is ferrite rubber for absorbing radio wave leakage from door 102.

1413 is the outer shell of the microwave oven main body 101.

In FIG. 23, the glass keyboard 105 is on the chassis 1401.
This is an enlarged view of the grip portion 1402 covered and fixed by the cushioning material 1403. Figure 24 shows chassis 1
401 shows the mounting structure of the control unit incorporated in the controller 401 in a vertical cross section.

As can be seen from the above embodiments, in the present invention, the timer time and heating time can be input and set by key operations on the keyboard, and the contents of the input settings are displayed on a numeric display and are also displayed in the control circuit. The output of the high frequency oscillator can be controlled using the keyboard, and at least one key on the keyboard is a duplicate key that can be used to input the timer time and heating temperature, so it is easier to use the same size keyboard than having separate keys. Each key can be made larger to make it easier to use, and since the number of keys is reduced, the user feels less cluttered, which also makes the device easier to use.

In addition, since the input setting for duplicate keys is automatically selected depending on whether the sensor probe is attached to the heating chamber wall, the user does not have to be aware of the duplicate keys, and from this point of view, the system is easy to use. I can do it.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view of a high-frequency heating device showing an embodiment of the present invention, Fig. 2 is an enlarged detailed view of the main keyboard portion of the same, Fig. 3 is an electric circuit diagram of the same high-frequency heating device, and Fig. 4 is a block diagram of the same main part control circuit, Figures 5 and 6 are detailed diagrams of the same main part, Figure 7 is a configuration diagram of the same main part touch-type keyboard, and Figure 8 is a detailed diagram of the same main part. Figure 9 is a cross-sectional view of the same door monitor switch, Figure 10 is a cross-sectional view showing the connection state of the sensor rope, Figure 11 is a circuit diagram with the same number display,
Figures 12 and 13 are diagrams showing the relationship between the segments of the display tube and the colon, Figure 14 is a circuit diagram without the status table, and Figure 1
Figure 5 is a circuit diagram showing the same temperature control mode, Figure 16 is a temperature control circuit diagram, Figure 17 is a high voltage relay drive circuit diagram, and Figure 18 is a diagram showing the same temperature control mode.
The figure shows the drive circuit diagram of the same power relay, Fig. 19 shows the same sound generation circuit diagram, Fig. 20 shows the same 50/60Hz pulse generation circuit diagram, Fig. 21 shows an enlarged perspective view of the same keyboard part, and Fig. 22 shows the same sound generation circuit diagram. FIG. 23 is a sectional view showing how the keyboard is attached, and FIG. 24 is a sectional view showing how the control section is installed in the chassis. 101...Microwave oven, 102...Door, 103...Handle part, 105...
Keyboard operation section, 106...Numeric display section, 1
08...Cooking start button, 109...
... Cooking stop button, 110 ... Sensor probe, 111 ... Heating chamber.

Claims (1)

[Claims] 1. A keyboard having a plurality of keys for inputting and setting timer time, heating temperature, etc., and a segment for displaying the contents of the timer time, heating temperature, etc. entered from this keyboard using numbers, symbols, etc. A numeric display device, a sensor probe that detects the temperature of the food and is detachable from the wall of the heating chamber, a sensor probe attachment/detachment detection means for detecting the attachment/detachment state of the sensor probe, and a timer for which the input is set. Programs include a timer function to control a high-frequency oscillator such as a magnetron based on time, a temperature control function to detect food temperature using the sensor probe, and control the high-frequency oscillator based on the input heating temperature. at least one key of the keyboard is a redundant key capable of inputting and setting the timer time and heating temperature, and also detects attachment and detachment of the sensor probe. When the sensor probe is detected to be attached to the heating chamber wall by the means, the function of the duplicate key is automatically switched so that the timer time can be set when the heating temperature is not set. heating device. 2. The high-frequency heating device according to claim 1, further comprising temperature control mode display means for displaying the attachment/detachment state of the sensor probe detected by the sensor probe attachment/detachment detection means. 3. The high-frequency heating device according to claim 1, further comprising a sensor probe monitor switch that is mechanically turned on and off in response to attachment and detachment of the sensor probe as the sensor probe attachment/detachment detection means. 4. The keyboard has a plurality of keys for setting different heating temperatures, and by pressing one of these heating temperature setting keys once, the heating temperature and unit corresponding to that key can be set with the numbers in the segment configuration. The high-frequency heating device according to claim 1, configured to be displayed on a display device.