JPS6120777B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electronically controlled cooking appliance.

Recently, electronically controlled cookers that control cooking operations using microprocessors have appeared. However, for such cookers, the input setting for the timer time is 0 to 9.
This is done by operating the numeric keys and a function key to give meaning to the numeric key input as timer time, but for operators who are unfamiliar with many key operations and numeric key layouts, the above method is Such input operations were rather complicated.

Therefore, electronically controlled cooking appliances have appeared in which the input setting of the timer time is performed by a timer means that can be changed by the operator's operation and outputs timer time information according to each position. However, the above-mentioned timer means may be displaced due to mechanical vibration of the cooking appliance itself, and in this case, there are drawbacks such as the timer time being set against the operator's will and unexpected cooking being performed. Ta.

For example, if the timer time is changed while heating is being performed at a desired timer time, there is a cooking device in which heating is performed again using the changed timer time. In this case, if the timer time is changed to 20 minutes and 15 seconds due to mechanical vibration just before the end of heating with the timer time of 20 minutes, heating will be performed again with the timer time of 20 minutes and 15 seconds. Cooking takes an unusually long time.

Therefore, an object of the present invention is to provide an auxiliary operation section on the operation knob of the timer means, and provide a switch means corresponding to the auxiliary operation section, so that when the operator operates the operation knob, the auxiliary operation section is operated at the same time. An object of the present invention is to provide an electronically controlled cooking appliance in which the timer time information is processed only when a predetermined output is generated from the switch means.

The present invention will be explained in detail below using an example of a microwave oven with a heater.

FIG. 1 shows an overview of a microwave oven 10 according to an embodiment of the present invention.

The microwave oven 10 has a cooking chamber 12 and a control panel 13 on the main body side, and is pivotally connected to the main body side.
A door 14 for opening and closing two openings is provided.

The control panel 13 is provided with a display section 15 for displaying information such as time, and an operation section 16 for operating the microwave oven, which will be described later. A door latch 17 and a door switch knob 18 are protruded from the inner periphery of the door 14, and when the door is closed, these enter into the main body to turn on the interlock switch and the door switch, respectively.

FIG. 2 shows details of the display section 15. The display 15 is constituted by a fluorescent numeric display tube, which is known per se, and has a numeric display surface with each digit consisting of seven display segments, sandwiching a colon. The display section 15 displays the time and the timer time. For example, 2:35 on the time display is displayed as [2:35],
The timer time display shows 13 minutes and 30 seconds [1330].

FIG. 3 shows details of the operation section 16. The operation unit 16 has "microwave strong" and "microwave weak A" keys in a frame labeled BLOCK A, an indicator lamp A (161A), and a timer operation knob A (162A), In addition, within the frame labeled BLOCK B, there are keys for "Microwave Weak B" and "Heater", an indicator lamp B (161B), and a timer operation knob B (162B), and outside these frames there is a "Microwave Weak B" and "Heater" key. CLOCK FAST”, “CLOCK
``SLOW'', ``START'', and ``CLEAR'' keys and a temperature control knob 163. Each of the above keys is constituted by a normal contact type push button switch.
The temperature control knob 163 is rotatable, and temperature scales of 100, 150, 200, and 250 [° C.] are printed and displayed along the rotational circumference. Rotation of this knob rotates a conventional variable resistor installed on the back surface of the control panel 13. Timer operation knobs A (162A) and (162B) are also rotatable, and "0" indicating the origin position is set along the rotation circumference.
The scale and evenly spaced scales of 5 minutes are printed and displayed up to 60 minutes. And the above timer operation knob A (1
62A) and B (162B) are normally open type and push button type knob compatible switches A and B (described later).
is buried and its movable parts A (164A) and B (1
64B) (auxiliary operation section) is provided in a protruding manner, and the operator can press the timer operation knob A (162B) (auxiliary operation section).
When A) and B (162B) are taken, the movable parts A (164A) and (164B) are pressed at the same time.

FIG. 4 shows the timer operation knobs A (162A) and B (162A) installed on the back of the control panel 13.
Signal generators A (20A) and B linked to 2B)
(20B) is shown.

That is, the generators A and B have the same structure, and the operating shaft 2 is fitted at the center of the back surface of the timer operating knob.
1, and the operating shaft 21 is rotated by rotation of the knob.

A rotary plate 22 is pivotally attached to the operating shaft 21 within a case 23 of the signal generator, and a common base of conductive brushes 24 is attached to the rotary plate 22.
Therefore, when the operating shaft 21 rotates, the tip of the brush 24 slides on the surface of the printed circuit board 25. Nine conductive path patterns 26 are arranged in parallel on the surface of the printed circuit board 25 along the circular sliding locus of the brush 24, and each conductive path pattern is arranged in parallel on the surface of the printed circuit board located outside the case 23. The common terminal portion 27 and the first to eighth signal terminal portions 28a to 28h are connected to each other.

FIG. 5 shows the conductive path pattern 26 developed in a straight line, and also shows the conductive path pattern 26 and the rotating plate 2.
2 and the brush 24 conceptually.

That is, the conductive path pattern 26 arranged parallel to the surface of the printed circuit board 25 has one common path 30 and a first
- eighth signal paths 31a to 31h, and the movement of the brush 24 in FIG. 4 is as shown in FIG. 5A.
In this case, the brush 24' perpendicular to the extending direction of the conductive path pattern 26 connects the common path 3 along the extending direction.
0 and each of the signal paths 31a to 31h.

Now, the positions of the brush 24' corresponding to the origin (0 scale) position and 60 minute position of the operation knobs 162A, 162B (Fig. 3) are 0 position on the left and 240 position on the right end, as shown in Fig. 5. position, and further the 0th position.
and the 240th position at equal intervals.
Assuming the 11th to 239th positions, the common path 30 exposes the conductive surface over the entire range from the 0th position to the 240th position, and the first signal path 31a is located at the N ₁ +4M ₁ position (N ₁ = 1, 2, M ₁ = 0 to 59), the second signal path 31b is at the N ₂ +8M ₂ position (N ₂ =
2 to 5, M ₂ = 0 to 29), the third signal path 31c is at the N ₃ +16M ₃ position (N ₃ = 4 to
11, M ₃ = 0 to 14), the fourth signal path 31d is the N ₄ +32M ₄ position (N ₄ = 8 to 23, M ₄
=0 to 7), the fifth signal path 31
e is the _N5 + _64M5 position ( _M5 =16~47, _M5 =0~
3), the sixth signal path 31f is
N ₆ +128M ₆ positions (N ₆ = 32 to 95, M ₆ = 0, 1), the 7th signal path 31g is each position represented by the N ₇ position (N ₇ = 64 to 191), the 8th signal path 31h The conductive surface is exposed only at each position represented by the _N8th position ( _N8 = 128 to 239), and the other positions are covered with an insulating film 32 indicated by dots in the figure.

Therefore, as shown in FIG. 5A, for example, the brush 2
4' is in the 14th position, when one pulse signal is applied to the common terminal portion 27' of the common path 30, the signal is transmitted to each signal path via the brush 24', but in the 14th position, First and fourth signal paths 31
Since the conductive surfaces are exposed only on the first and fourth signal terminals 28a' and 28 of these signal paths,
A pulse signal appears only at d′. Therefore, if the presence or absence of the pulse signal at the first to eighth signal terminal portions 28a' to 28h' of each signal path is associated with bits 1 and 0, each terminal portion 28a' to 28h at the 14th position is
The signal generation state of h′ is [10010000]. Similarly, examples of signal generation states at other positions are shown in the table below.

Position Signal generation state 0 0000 0000 1 1000 0000 2 1100 0000 3 0100 0000 4 0110 0000 5 1110 0000 ……………………… As is clear from the table above, 8 corresponding to each position of the brush 24' A bit code signal is obtained, but the signals corresponding to adjacent positions change only by one bit, and therefore, such code signal is represented by a so-called Gray code system.
If the generated signal is expressed in the Gray code system in this way, even if the brush 24' is in a state where it straddles two adjacent positions for some reason, the signals obtained will correspond to positions that are far apart. Since the signal corresponds to either of the above-mentioned adjacent positions, it does not result in a large error signal, which is extremely advantageous.

As is now clear, the signal generator 2 shown in FIG.
0A, 20B are timer operation knobs 162A, 16
241 according to the amount of displacement from the origin of 2B (Fig. 3)
The seed code signal is sent to the first to eighth signal terminal portions 28a to
28h, therefore the timer operation knob 162
Assuming that the range from 0 to 60 minutes displayed around A and 162B is divided into 240 evenly spaced minute scales, a code signal corresponding to 15 seconds per unit minute scale is obtained.

FIG. 6 shows an electric circuit diagram of the microwave oven 10.

The microwave generator 40 has a well-known configuration including a magnetron 45, a high voltage transformer 46, etc., and a high voltage input winding 46a of the high voltage transformer includes an interlock switch 41 and a first bidirectional thyristor 42.
It is connected to 60Hz commercial power supply terminals 43 and 44 through the terminal.

The heater 47 is connected to the power supply terminals 43 and 44 via the interlock switch 41 and the second bidirectional thyristor 48. Such a heater is mounted above the cooking chamber 12 and provides thermal energy to the food being cooked when it is red hot.

The interlock switch 41 is turned on by the door latch 17 mentioned in FIG.
When a voltage is applied to its gate through photocouplers 49 and 50, it turns on. Therefore, when the first photocoupler 49 operates with the door 14 of the microwave oven closed, the magnetron 45 is energized, and when the second photocoupler 50 is operated, the heater 47 is energized, and each energy is supplied to the cooking chamber 12.

The gates of the first and second bidirectional thyristors 42 and 48 are connected to the power supply terminal 44 via the first and second normally closed contacts 52a and 52b of the relay 51 on the other hand, and therefore are normally connected to the respective gates. are shorted to prevent external noise from undesirably turning on each bidirectional thyristor.

First and second normally open contacts 53a and 53 of relay 51
b is a blower motor 5 that cools the magnetron 45;
4 and the low voltage input winding 46b of the high voltage transformer 46. The other ends of the blower motor 54 and the low voltage input winding 46b are connected to the power supply terminal 43 via the interlock switch 41.

The first photocoupler 49 operates when both the first and second transistors 55 and 56 are on, and the second photocoupler 50 operates when the first and third transistors 55 and 56 are both on.
It operates when both 5 and 57 are on. relay 5
1 operates when the first transistor 55 is on, its first and second normally open contacts 53a and 53b are closed, and its first and second normally closed contacts 52a and 52b are open.
Therefore, due to this relay operation, the blower motor 54
is driven, the cathode of the magnetron 45 is energized, and the first and second bidirectional thyristors 4
2 and 48 become operational.

The control power supply unit 58 is connected to the power supply terminals 43 and 44 via a step-down transformer 59, and is connected to the DC power supply voltages Vc and _-VD distributed to each part of the circuit described above and the circuit described below, and the display tube. A heater voltage Vf and a 60Hz signal voltage TB are respectively generated.

The first, second and third transistors 55, 5
6 and 57 are turned on and off by an output command from a microprocessor 60 as a control means.

The microprocessor 60 has many input/output terminals, and the following description will focus on these input/output terminals.

Each terminal OSC ₁ and OSC ₂ is a circuit constant connection terminal for generating a synchronous clock inside the microprocessor, and a coil and a capacitor are externally connected to set the clock frequency to 400 KHz.

OB is a buzzer instruction terminal for generating a confirmation sound when cooking is completed, and when there is an output at this terminal, the transistor 61 is turned on and the buzzer 62 sounds.

IC ₁ is an input terminal for checking whether the door 14 of the microwave oven is open. That is, the door switch 63, which is turned on by the door switch knob ₁₈ described in FIG. Recognizes the release of the robot and determines whether it is necessary to interrupt or prohibit its own actions.

RESET is an input terminal for resetting the internal state of the microprocessor 60 to the initial state when the microwave oven 10 is powered on. In other words, when the power is turned on, the rising terminal of the DC power supply voltage Vc
It is detected by a detection circuit 64 including a transistor and a Zener diode connected to RESET, and the detection power is input to the terminal RESET.

Each of the terminals IE ₁ and IE ₂ is an input terminal for checking whether the operator has turned the timer operation knobs A (162A) and B (162B). In other words, the terminal has movable parts A (164A) and B described in FIG.
(164B) is pressed, the normally open knob switches A (80A) and B (80A) turn on.
0B) is connected, and the microprocessor 60
is when there is an input signal to terminals IE ₁ and IE ₂ , that is, knob-compatible switches A (80A) and B (80B).
When the timer operation knobs A (162A) and B (162B) are on, it is recognized that there is a photographing operation, and a signal from a timer time input terminal (described later) is inputted and processed accordingly.

INT is an interrupt terminal, and the 60Hz signal TB is shaped into a 60Hz pulse signal by a waveform shaping circuit 65 consisting of a transistor, a diode, a capacitor, etc., and then input to the terminal INT. The microprocessor 60 interrupts other processing every time a 60 Hz pulse signal is received and executes timekeeping processing. That is, a second signal, a minute signal, a time signal, etc. are generated in synchronization with the pulse signal, and these signals are used for various time controls such as timer operation.

OD _S 1 to OD _S 7 are display output terminals, and OD _G 1 to OD _G 5
are input/output control terminals, and the terminal power from these terminals is input to the display section 15 described above. The display section 15 displays OD _S 1 to OD _S 7 as segment selection signals, and OD _G 1 to
This is done in a well-known time division format using OD _G 4 as a digit selection signal for each digit of the number. That is, for example, when there is an output at terminal OD _G 2, terminals OD _S 2, OD _S 3,
If there is output on OD _S 4, OD _S 5, or OD _S 6, the number "2" will be displayed in the second digit. Further, OD _S 7 and OD _G 5 are used as a colon selection signal and a colon digit selection signal, respectively.

Each of the terminal outputs OD _G 1 to OD _G 5 is applied to five column lines of the key matrix 56 on the other hand.

IK ₁ to _{IK 4} are key signal input terminals, each of which is connected to four row lines of the key matrix 66.

Each key switch of the operating section 16 (FIG. 3) is cross-connected to a predetermined intersection of the column lines and row lines that constitute the key matrix 56, and when a key operation is performed on the operating section 16, the key switches correspond to the corresponding keys. At the intersection point, the column line and row line forming the intersection point are electrically connected via the key, and the terminal IK ₁
~ A signal is input to the IK ₄ that is connected to the row line.

The microprocessor 60 therefore has terminals OD _G 1~
The operated key is determined by checking the state of the input signals to the terminals IK ₁ to _{IK 4} in synchronization with each output signal of the OD _G 5.

OD ₆ is a timer time A control output terminal, OD ₇ is a timer time B control output terminal, IT ₁ to _{IT 6} are timer time input terminals, and each output pulse of OD ₆ and OD ₇ is output from the signal generator A described above. (20A) and signal generator B
(20B) into the common terminal section 27, and the first to eighth signal terminal sections 28a to IT ₁ to IT ₆ of each signal generator
28h output signal is input.

IC ₂ is a temperature detection input terminal, and a comparator 74 compares the output voltages of a temperature detection section 71 including a thermistor 70 and a temperature setting section 73 including a variable resistor 72, and the comparison output is input to terminal IC _2. . The thermistor 70 is placed near the wall of the cooking chamber 12 to detect the atmospheric temperature within the cooking chamber. The variable resistor 72 is attached to the back of the control panel 13 and changes its resistance value in conjunction with the rotation of the temperature control knob 163 (FIG. 3). Therefore, the comparator 74 sends an output to the terminal IC ₂ when the temperature inside the cooking chamber detected by the thermistor 70 exceeds the temperature set by the temperature control knob 163.

OT is a heating instruction terminal, OM is a microwave output level instruction terminal, and OH is a heater instruction terminal. In the heating execution stage, the microprocessor 60 first generates an output at the terminal OT, and after a slight delay, in the case of microwave heating, Outputs are generated at the terminal OM and, in the case of heater heating, at the terminal OH, and these outputs are used to connect the first transistor 55 and the second transistor 5.
6 or the third transistor 57 is turned on.

OL _A and OL _B are a timer type A display output terminal and a timer type B display output terminal, respectively, and the microprocessor 60 outputs the terminal OL when the display content of the display unit 15 is related to the time set by the timer operation knob A (162A). _A , the transistor 75 is turned on, and the display lamp A (161A) (Fig. 3) is turned on.If the time is related to the time set by the timer operation knob B (162B), the output is sent to the terminal OL _B , and the transistor 76 is turned on. On display lamp 161
Turn on B.

The microprocessor 60 is composed of a one-chip semiconductor integrated circuit, and mainly consists of a ROM (read only memory), a RAM (random access memory), an arithmetic unit, and the like. The microprocessor 60 used in this example is manufactured by NEC Corporation.
It is a microprocessor μPD553 made by Manufacturer.

The microprocessor 60 executes work according to a program written in its ROM, and FIG. 7 shows such a program.

The control operation of the microprocessor 60 will be explained below with reference to FIG. When executing a program, various storage areas of the RAM mentioned above are used, but the main area is a 4-digit long storage area, where 4 bits are one digit.
DISPLAY area, CLOCK area, TIME1 area and
TIME2 area, 2-digit NT area, OT1 area and
CT2 area, 1 digit long FKB area, 1 bit FLG
1 to FLG11. The CLOLK area above stores the current time, and also the TIME1 area and TIME2 area.
The areas store each timer time related to timer operation knob A (162A) and timer operation knob B (162B), respectively, and the DISPLAY area is an output buffer for outputting the contents of the CLOCK area and the TIME1 and TIME2 areas to the display unit 15. used as.
Each of the areas FLG1 to FLG11 is used as a flag for control. The FLG3 area shows whether a key was pressed, the FLG4 area shows which key of "Microwave Strong" or "Microwave Weak A" was pressed, and the FLG5 area shows whether a key was pressed. The FLG6 area indicates which key of "Low B" and "Heater" has been operated.
A) or timer operation knob B (162B) to read the timer time, the FLG7 area shows whether any of the keys in BLOCK A and BLOCK B of the operation unit 16 was operated, and the FLG8 area shows:
Which BLOCK is BLOCK A or BLOCK B above?
The FLG9 area determines whether the keys of both BLOCKs were operated first, the FLG10 area determines whether the heating is being performed, and the FLG11 area determines whether the door 14 is activated while the heating is being performed. It remembers whether it has been released or not.

Although it does not appear in the program shown in Figure 7,
As described above, the microprocessor 60 forms a time signal based on the 60 Hz pulse signal input to the interrupt input terminal INT, and uses this signal to update the current time in the CLOCK area.

In FIG. 7, rectangular frames and diamond-shaped frames indicate individual steps constituting the program, and the numbers attached near each frame indicate the step numbers. In principle, the program progresses from a small step number to a large step number in the order of the arrangement of each frame, and exceptionally at return or according to the establishment or failure (i.e. YES, NO) of the decision step represented by the diamond frame. Then move on to the appropriate steps.

Generally, among the steps of rectangular frame display,
In the steps marked FLGn←0 and FLGn←1 (where n=1 to 11), 0 and 1 are added to the FLGn area, respectively.
is written, and among the steps of the diamond frame display,
FLGn=1? (however, n = 1 to 11), the contents of the FLGn area are examined and
If the value is 0, it is determined to be YES, or if it is 0, it is determined to be NO.

The remaining steps will be explained below.

A1 step: This step is automatically executed by an input signal to the terminal RESET of the microprocessor when power is turned on to the microwave oven. In this step, the clock-related area including the CLOCK area of the RAM is cleared.

A2 step: All output terminal signals of the microprocessor as well as all other areas of the RAM except the above time-related areas are cleared.

A3, A21 steps: Output is generated at the output terminal OD ₆ of the microprocessor, and therefore, at this time, the 8
A bit signal is generated by signal generator A (20A) and applied to input terminals IT ₁ -IT ₈ of the microprocessor.

Steps A4, A12, A22, A45: The signals entering the input terminals _IT1 to _IT8 of the microprocessor are stored as they are in the NT area.

Steps A5 and A23: The output of the microprocessor output terminal _OD6 is reset and disappears.

Steps A6, A35, A67: The contents of the NT area are transferred to the OT1 area. Note that the contents of the NT area are preserved even after such transfer.

A7, A15, A36, A52 steps: NT
The contents of the area are code converted, changing from the original 8-bit Gray code system to an 8-bit pure binary code system.

Although such conversion can be performed using well-known logical operations, a particularly simple method was adopted in this embodiment. That is, to convert a Gray code into a pure binary code using an arithmetic unit, the presence or absence of "1" is checked sequentially from the upper bit to the lower bit of the Gray code, and each time an odd-numbered "1" is encountered. In this method, the inversion operation of the lower bit contents is continued until the next "1" bit.

Steps A8 and A37: The contents of the NT area are further converted from the 8-bit pure binary code system to the 4-digit BCD system and stored in the TIME1 area. Such conversion is also performed by well-known logical operations.

Steps A9 and A38: The numerical values that enter the TIME1 area in steps A8 and A37 correspond to the number of minute scales from the origin of timer operation knob A (162A), and the unit minute scale corresponds to 15 seconds. In the following steps A9 and A38, the contents of the TIME1 area are multiplied by 15. In other words, the contents of the TIME1 area are changed to the timer operation knob A.
The timer time corresponding to the position (162A) is expressed in seconds. For example, the operation knob is 5 minutes
Assuming that it is at the 30 second position, the contents of the TIME1 area will be [0330].

A10, A39 steps: The contents of the TIME1 area expressed in seconds at A9, A38 steps are A.
10. Converted to minutes and seconds in A39 steps. That is, in the above example, [0330] is converted to [0530].

Steps A11 and A44: An output is generated at the output terminal OD ₇ of the microprocessor, and an 8-bit signal corresponding to the position of the timer operation knob B (162B) is generated from the signal generator B (20B), and the output terminal of the microprocessor is generated. Enter input terminals IT ₁ to _{IT 8} .

Steps A13 and A46: The output of the microprocessor output terminal _OD7 is reset and disappears.

Steps A14, A51, A66: The contents of the NT area are transferred to the OT ₂ area. Note that the contents of the NT area are preserved even after such transfer.

A16 and A53 steps: Similar to A8 and A37 steps, the contents of the NT area are further converted from the 8-bit pure binary code system to the 4-digit BCD system.
Stored in TIME2 area.

Steps A17 and A54: Similar to steps A9 and A38, timer time information regarding timer operation knob B (162B) is displayed in seconds and enters the TLME2 area.

Steps A18 and A55: Similar to steps A10 and A39, the contents of the TIME2 area are converted into minutes and seconds.

A19 step: The contents of the CLOCK area are
Transferred to the DISPLAY area. Thus, after transfer
The contents of the CLOCK area are saved.

A23' step: Knob compatible switch A (8
0A) is checked through the input terminal _IE1 of the microprocessor.

Step A24: It is determined whether the contents of the NT area and the OT1 area are the same.

Step A28: A display is made on the display section 15 and a key operation on the operation section 16 is detected.
That is, outputs are sequentially generated to the input/output control terminals ODG1 to ODG5, and the contents of each digit in the DISPLAY area synchronized with the outputs of these terminals ODG1 to ODG4 are code-converted and output to the display output terminals OD _S 1 to OD _S 7. Ru. Note that, at this time, display of unnecessary 0's at the higher level is suppressed. Also, the contents of the FLG2 area are checked and if it is 0, an output is generated at the terminal OD _S 7 in synchronization with the output of the control terminal ODG ₅ to display the current time, and the display section 15
A colon is displayed. On the other hand, if there is a key operation on the operation unit 16, it is the key signal input terminal IK ₁
~IK ₄ is detected, the code corresponding to the key is stored in the FKB area, and 1 is stored in the FLG3 area.
is written and the key operation is memorized.

Steps A40 and B27: The contents of the TIME1 area are transferred to the DISPLAY area. Even after such transfer
The contents of the TIME1 area are saved.

Steps A41 and B28: The outputs of the microprocessor output terminals OLB and OLA are set to OFF and ON, respectively.

A46' step: Knob compatible switch B (8
0B) is checked through the input terminal IE ₂ of the microprocessor.

Step A47: It is determined whether the contents of the NT area and the OT2 area are equal.

Steps A56 and B25: The contents of the TIME2 area are transferred to the DISPLAY area. Even after such transfer
The contents of the TIME2 area are saved.

Steps A57 and B26: The outputs of the microprocessor output terminals OL _A and OL _B are set to OFF and ON, respectively.

Step A62: The contents of the FKB area are examined to determine whether it corresponds to the "START" key.

Steps A60, B1, C37: The open/closed state of the door 14 is checked through the input terminal _IC1 of the microprocessor.

B4, B29 steps: All outputs of the microprocessor output terminals OM, OH, and OT are turned off.

Steps B7 and B16: Generate output at 30% duty at the output terminal OM of the microprocessor.

In other words, when performing heating with microwaves, as will be clear from the explanation later, steps B7 and B16 are passed through many times per second, and the output of the output terminal OM is generated when the steps B7 and B16 are passed for the first time. is turned on, and then when the above step is passed after 3 seconds have elapsed, the output of the output terminal OM is turned off, and then when the above step is passed after 7 seconds have elapsed, the output of the output terminal OM is turned on again. is repeated. When heating is performed, an output is also generated at the output terminal OT, so by repeatedly passing through steps B7 and B16 as described above, the magnetron 45 has one period of 10 seconds, and oscillates for only 3 seconds within each period. The oscillation output is set at 180W.

B8 step: Microprocessor input terminal
Check the presence or absence of input to IC ₂ , and if yes, output terminal OH
Turn off the output of , or turn on the same output if there is none.

B9 step: The contents of the TIME2 area are decremented every second. That is, like the B7 step, when heating is performed, the B9 step is repeatedly passed at a rate of many times per second, and the above-mentioned subtraction processing is performed every second during such passing.

B10 step: It is determined whether the contents of the TIME2 area have become 0 or not.

B11 step: Microprocessor output terminal
Turn off the output of OL _B.

B17 step: Microprocessor output terminal
OM output turns on.

B18 step: Same as B9 step, TIME
The contents of one area are decremented every second.

Step B19: It is determined whether the contents of the TIME1 area have become 0 or not.

B20 step: Microprocessor output terminal
Turn off the output of OL _A.

B30 step: Microprocessor output terminal
Let OB produce an output for 1 second, then advance the program to step A2.

C2, C4 ~ ~ C8, C10 steps: In each of these steps, the contents of the FKB area are checked and it is determined whether it is [CLEAR], [START], [Microwave Strong],
It is determined whether the key corresponds to any one of [Microwave Weak A], [Microwave Weak B], [Heater], and [CLOCK FAST]. If neither of these is the case, press the [CLOCK SLOW] key and proceed to step C11.

C11 and C12 steps: These steps change the contents of the CLOCK area at a faster rate than usual.

In other words, the contents of the CLOCK area are usually updated every minute since the least significant digit is in units of one minute, but in the C11 step this update is done every second, and in the C12 step this update is done every 0.5 seconds. .

C39 step: Microprocessor output terminal
OT output turns on.

The control operation of the microprocessor 60 will be explained in more detail below.

[1] Start of energization and time setting First, when the energization of the microwave oven is started, the program passes through steps A1 to A23 and reaches step A23'. In such a case, timer operation knob A (162
Unless you take pictures of A), the knob-compatible switch A (8
0A) does not turn on because the movable part A (164A) is not pressed, so A2 does not turn on after step A23'.
5, A26, A28 to A30, and then reaches step A31. Assuming that there is no key operation on the operation unit 16, the program starts from step A31, passes through steps A32 and A33, and returns to step A19.
Return to step A20.

At this time, since the contents of the FLC6 area have already become 1 at step A26, the program then passes through steps A44 to A46 and reaches step A46'.

Then, unless the timer operation knob B (162B) is photographed, the knob corresponding switch B (80B) will not turn on because the movable part B (164B) is not pressed, so after step A46', A48, A49
After each step, the program returns to step A28, and the program continues in the same manner from A19 to A23.
A23', A25, A26, A28-A33 first loop, or A19, A20, A44-A4
6, A46', A48, A49, A28-A33
The second loop of the second loop is alternately circulated. In this circulation process, the contents of the CLOCK area are transferred to the DISPLAY area at step A19, and displayed on the display section 15 at step A28. This is a time display, but since the time has not been set, the displayed time is incorrect.

To set the time, use [CLOCK FAST].
When the key is pressed or the [CLOCK SLOW] key is pressed, the key operation is detected at step A31 in the above circulation process, and the program enters step C1 from step A31, then proceeds through steps C2 to C10, and then continues. The process returns to step A19 via step C12 or C11. Therefore, as long as you keep pressing the [CLOCK FAST] or [CLOCK SLOW] key, the program will continue from A19 to A23.
A23', A25, A26 (or A19, A2
0, A44-A46, A46', A48, A4
9), A28 to A31, C1 to C10, C12 or C11 are cycled through, and during this time the display section 1
The displayed time at 5 changes quickly.

When the above key is released when the displayed time is correct, the program will return to the above first position.
The loop or the second loop is circulated, and thereafter the display section 15
will display the correct current time. Hereinafter, this state will be referred to as a standby state.

[] High microwave heating → Low microwave heating When cooking for 25 minutes with a high power (60CW) microwave, and then 40 minutes with a low power (180W) microwave, First, use the operation unit 16 to turn the timer operation knobs A (162A) and B.
(162B) to the 25 minute and 40 minute scale positions, respectively.

For example, when the timer operation knob A (162A) is photographed and rotated by light, such timer operation is detected at each step of A23' and A54 in the standby state. In other words, by photographing timer operation knob A (162A), knob corresponding switch A (80A)
Since the movable part A (164A) is pressed and turned on, the step A24 is reached after the step A23'. At this time, since the rotation operation of knob A (162A) causes the timer times read in steps A6 and A22 to differ, step A27 is reached after step A24. Then A28~A3
2. Go through steps A34 to A43.

In other words, the new timer time information "25 minutes" is stored in the TIME1 area at step A39, and is also transferred to the DISPLAY area at step A40, and then transferred to the DISPLAY area at step A41.
In this step, only indicator lamp A (161A) is lit.

The program is then A20, A44-A46,
The third loop of A46', A48, A49, A28-A33 and A20-A23, A23', A25,
A26 and the fourth loop of A28 to A33 are alternately circulated, and during this time, 25 minutes is displayed as timer time information at step A28, and the display lamp A (16
1A) is lit, and the user is informed that the content displayed on the display section 15 is time information regarding timer operation knob A (162A).

Next, when the timer operation knob B (162B) is photographed and rotated, such timer operation is detected at steps A46' and A47 in the circulation process of the third loop.

That is, when the timer operation knob B (162B) is photographed, the knob corresponding switch B (80B) is turned on by pressing the movable part B (164B).
After step A46', step A47 is reached. At this time, the rotation operation of knob B (162B) is A1.
Since the timer times read in steps 4 and A45 are different, after step A47,
It takes 50 steps. After that A28-A32, A
34, A51 to A58, and A43. In other words, the new timer time information "40 minutes" is A55.
It is stored in the TIME2 area at step A56, and also transferred to the DISPLAY area at step A56.
Only indicator lamp B (161, B) is lit in 7 steps. The program then alternates between the fourth loop and the third loop, and during this time "40 minutes" is similarly displayed as timer time information.
In addition, the display lamp B (161B) is lit, and the content displayed on the display section 15 is the timer operation knob B (161B).
2B).

The timer operation knobs A and B can be operated in any order, and the time information indicated by the timer operation knobs A and B is always stored in the TIME1 and TIME2 areas, respectively, and the time information of the one operated most recently is always stored in the TIME1 and TIME2 areas. is displayed on the display section 15, and the display lamp A (16
1A) or B (161B) lights up and the display section 15
It shows which knob the displayed content corresponds to.

In addition, timer operation knob A (162A) or B (1
62B), the program will be A24 or A4.
After 7 steps A25, A26 (or A48, A
49) and steps A28 to A33, such operations have no effect on the above-mentioned operations.

Next, in the operation unit 16, select “Microwave strong”.
The "microwave weak B" and "START" keys are operated in sequence.

"Microwave strong" key operation is the 3rd and 4th key operation above.
In the loop circulation process, it is detected at step A31, and the program then moves to C1-C5, C13,
Steps C15 to C17 and A40 to A43 are passed, and at this time, in step C13, the fact that the ``microwave strong'' key was pressed is memorized, and in step C17, an arbitrary button within the frame of BLOCK A of the operation section 16 is pressed. The occurrence of one key operation is memorized, and the contents of the TIME1 area are stored in step A40.
It is transferred to the DISPLAY area, and only the display lamp A is lit at step A41.

As long as you continue to operate the "Microwave Strong" key, the program will continue to run from A20, A44 to A46, A4.
6', A48, A49, A28~A31, C1~
C5, C13, C15, C16, C18, A40
~A43 loop or A20~A23,A2
3', A25, A26, A28~A31, C1~
C5, C13, C15, C16, C18, A40
~A43 loop is alternately circulated, and when the above key operation is no longer performed, A20~A23, A23', A2
5, A26, the fourth loop of A28 to A33, or A20, A44 to A46, A46', A48, A
49, the third loop of A28 to A33 is alternately circulated, and in this circulation process, the timer operation knob A
The time information indicated by (162A) is displayed on the display unit 15, and the display lamp 161A is turned on.

The next "microwave weak B" key operation is the third one above.
In the cyclic process of the fourth loop, it is detected at step A31, and the program then moves through C1 to C7, C
23, C25-C28, A56-A58, A43
At this time, the operation of the "microwave weak B" key is memorized in step C23, and the operation section 16 is activated in step C28.
It is memorized that the keys in each frame of BLOCK A and BLOCK B have been operated together, the contents of the TIME2 area are transferred to the DISPLAY area at step A56, and only display lamp B is lit at step A57. As long as you continue to operate the "Microwave Weak B" key, the program will continue from A20 to A23, A2.
3', A28, A26, A28~A31, C1~
C7, C23, C25, A56-A58, A43
loop, or A20, A44 to A46, A4
6', A48, A49, A28~A31, C1~
C7, C23, C25, A56-A58, A43
When the above-mentioned key operation stops, A20 to A23, A23', A25, A2
6, the fourth loop of A28 to A33, or A20,
A44-A46, A46', A48, A49, A
The third loop of 28 to A33 is alternately circulated, and in this circulation process, the timer operation knob B (162
The time information instructed by B) is displayed on the display section 15, and the display lamp 161B is lit.

By operating the above "Microwave Strong" key and "Microwave Weak B" key in sequence, the contents of FLG ₈ area will be 0.
However, this can be confirmed in the operation section 16.
This means that the key in the BLOCK A frame was operated before the key in the BLOCK B frame.

The last "START" key operation is the 3rd and 4th key operation above.
In the loop circulation process, it is detected at step A31, and the program then moves to C1-C4, C37.
Each step from C40 to C40 is passed. At this time C3
In step 9, the first transistor 55 is turned on. . The program is then A20-A23, A2
3', A25, A26 (or A20, A44~A
46, A46', A48, A49), A28~A3
0, B1, B5, A15, B17-B19, B2
4, B27, B28, and A31, and at this time, the second transistor 56 is turned on at step B17, so that the magnetron 45 starts oscillating.

If the "START" key is still being operated, the program will go to step C1 after step A31, then go through steps C2 and C3, and then go to step A32.
The process moves to step A33 and returns to step A20.

When the above key operation is no longer performed, after the A31 step, the program returns to the A20 step via each step of A32 and A33, and then returns to the A20 step.
6', A48, A49, A28~A30, B1,
B5, B15, B17-B19, B24, B2
7, B28, A31-A33 loop or A20
~A23, A23', A25, A26, A28~
A30, B1, B5, B15, B17-B19,
The loops of B24, B27, and A31 to A33 are alternately circulated. At this time, TIME is set at step B18.
The contents of one area are decremented every second, and the contents are moved to the DISPLAY area at step B27 and displayed as the timer remaining time at step A28. In addition, since the B28 step has passed, the display lamp A (161A) is lit, and the display content on the display section 15 is based on the timer operation knob A (162A).
It is shown that it relates to A). Furthermore, during this time, both the first and second transistors 55 and 56 are kept in the on state, so the magnetron 45 is 100
% duty, that is, continuous oscillation, and outputs 600W of microwave.

In the above circulation process, when the timer time "25 minutes" has elapsed and the timer remaining time becomes 0, this is detected in step B19, and the program then moves to B19.
20~B26, A31~A33, A20~A2
3, A23', A25, A26 (or A20, A
44~A46, A46', A48, A49), A2
B6 through each step of 8 to A30, B1, and B5
Reaching the steps. That is, this means that 25 minutes of high-intensity microwave heating has been completed.

The program is then B7, B9, B10, B2
4 to B26, A31A33, and then A20A to A23, A23', A25,
A26, A28-A30, B1, B5-B7, B
9, B10, B24-B26, A31-A33 loop or A20, A44-A46, A46',
A48, A49, A28~A30, B1, B5~
B7, B9, B10, B24~B26, A31~
The loop of A33 is alternately circulated. At this time, B
The contents of the TIME2 area are decremented every second in 9 steps, and the contents are reduced in B25 steps.
It is moved to the DISPLAY area and displayed as the timer remaining time in A28 steps. Also, because the B26 step has passed, the indicator lamp B (161B)
is lit, indicating that the content displayed on the display section 15 is related to timer operation knob B (162B). Furthermore, by passing through step B7 during this time, the magnetron 45 oscillates at a duty of 30% and outputs a microwave of 180W.

In the above circulation process, when the timer time "40 minutes" has elapsed and the timer remaining time becomes 0, it is detected at step B10, and the program then moves to B10.
After passing through steps 11, B12, B29, and B30, the process reaches step A2. That is, as a result, all the first to third transistors 55 to 57 are turned off, and 40
The buzzer 62 notifies you that the minute-long microwave weak heating has ended and that all operations have been completed.

Thereafter, the microwave oven enters the standby state described above and the current time is displayed on the display section 15.

[] Weak microwave heating → Strong microwave heating To perform microwave heating with a weak output followed by microwave heating with a strong output, operate the timer in the same way as in the case of [] above. After setting the appropriate timer time using knobs A and B,
"Microwave weak B", "Microwave strong",
Each "START" key is operated in sequence.

The program is C7, C23, C25, C26, C29, C3 by pressing the "microwave weak B" key.
After passing each step of 0, continue "Microwave strong"
By key operation C5, C13, C15, C16,
As each step of C18 and C19 is passed,
If the "START" key is operated, the same as the case [] above occurs, but the heating execution order is reversed.
First, weak microwave heating is performed with a duty of 30%, and then strong microwave heating is performed with a duty of 100%.

[] Strong microwave heating → Heater heating If you do not cook for 20 minutes with a strong microwave and then cook for 30 minutes with a sensitivity of 200℃ using a heater, first operate the timer as in the case [] above. Knobs A (162A) and B (162
B) to the 20 minute and 30 minute scale positions, respectively, and set the temperature control knob 163 to the 200°C scale position, then turn on the "Microwave Strong", "Heater",
Perform key operations in the order of "START".

Therefore, the same process as above [] is performed at the step of operating the "Microwave Strong" key, and the program passes through each step of C8, C24 to C28 by operating the "Heater" key, so the subsequent "START" key operation As in the case [] above, a strong microwave is first generated for 20 minutes, and then the program is A20 to A23, A23', A25,
A26, A28-A30, B1, B5, B6, B
8-B10, B24-B26, A31-A33 loop or A20, A44-A46, A46',
A48, A49, A28-A30, B1, B5,
B6, B8~B10, B24~B26, A31~
The loop of A33 is alternately circulated. At this time, the remaining time of the timer is also displayed, and the display lamp B
(161B) lights up. Also, during this time, by passing through step B8, the heater 47 is driven to heat when the temperature of the cooking chamber 12 is below 200°C, and is deenergized when it exceeds 200°C, so that the temperature of the cooking chamber is approximately the same.
Maintained at 200℃.

In the above-mentioned circulation process, when the timer time "30 minutes" elapses, the heater heating ends in the same way, and the buzzer 62 notifies that all operations have been completed, after which the microwave oven enters the standby state described above.

[V] Heater heating → Strong microwave heating To perform microwave heating with strong output after heating the heater in the reverse order to the above [], use the timer operation knobs A and B and the temperature as in the case [] above. After setting the appropriate timer time and temperature using the adjustment knobs, select "Heater", "Microwave Strong",
Each "START" key is operated in sequence.

The program is C8, by operating the "heater" key.
After passing through each step of C24 to C26, C29, and C30, press the "Microwave Strong" key to switch to C.
5, C13, C15, C16, C18, and C19, so when the "START" key is operated, the heating execution order is reversed and the heater starts first. Heating is performed, followed by intense microwave heating.

[] Microwave weak heating → Heater heating To perform heater heating after microwave heating with low output, similarly set the appropriate timer time and temperature, and then turn on "Microwave weak A", [Heater],
It is now clear that each "START" key can be operated in sequence.

[] Heater heating → weak microwave heating To perform microwave heating at a weak output after heating the heater in the reverse order of [] above, set the appropriate timer time and temperature in the same way, and then turn the [heater] ,
It is now clear that it is only necessary to operate the "microwave weak A" and "START" keys in sequence.

As is clear from each of the operating modes [] to [] above, especially the operating modes [] and [] described in detail, it includes a standby state in which the current time is displayed, before and after operating the "START" key. In any state, timer operation knob A (162A) or B
(162B) and operate it, the movable part A
Since (164A) or B (164B) is pressed, the program periodically passes through each step of A24 or A47 and each step of A28 and A32. New timer time information corresponding to
The timer time information written in the corresponding one of the TIME1 area and the TIME2 area, and at least in the state before the "START" key is operated, the timer time information of the one that has been displaced most recently is displayed on the display section 15.

[]Independent heating To perform microwave heating only at high output, set the time with timer operation knob A, then press the keys in the order of "Microwave strong" and "START", or microwave at low output. To perform heating only, set the time with timer operation knob A and then press the keys ``Microwave Low A'' and ``START'', or set the time with timer operation knob B and then press ``Microwave Low B'' and ``START''. In addition, to only heat the heater, set the time and temperature using the timer operation knob B and temperature adjustment knob, and then operate the "Heater" and "START" keys in sequence. It's clear now.

[]Clear operation Regardless of whether the microwave oven is heating or not, the program always passes through each step of A28 and A31, so if you press the "CLEAR" key on the operation unit 16 when you make a mistake, Program is A
After passing through steps 31, C1, and C2, the process returns to step A2, and the microwave oven enters the standby state unconditionally.

[X] Interruption of heating execution Opening the door 14 of the microwave oven has no effect on the control operation of the microprocessor even if it is done when heating is not in progress, but if it is opened while heating is in progress, heating is interrupted. is interrupted.

In other words, the B1 step is passed during the heating process, so when the door is opened, the heating process is stopped at the B4 step. is A20~A23, A23', A25, A2
6 (or A20, A44-A46, A46', A
48, A49), A28, A29, and A60, and during this time the time counting operation of the timer is interrupted.

Then when the door is closed, the program is A2
0 to A23, A23', A25, A26 (or A
20, A44-A46, A46', A48, A4
9), A28, A29, A60, A61, A6
4. After cycling through the A33 loop, when the "START" key is pressed, the program returns to A6.
After each step from 0 to A63 and A70, C3
Step 9 is entered, and the heating execution described above is therefore restarted.

However, in such a microwave oven, even if the timer operation knob A (162A) or B (162B) turns undesirably due to mechanical vibration regardless of the operator's above-mentioned operation, the A39 can be turned off by the program shown below. Or, since the A55 step is not passed, the timer time changed due to the above rotation is TIME1 or TIME2.
No new data will be stored in the area.

That is, regardless of whether the microwave oven is heating or not, the program always passes through step A23' or A46', and in this case, timer operation knob A (162A) or B (162B) is not photographed. , then A25, A26 (or A48,
After passing through steps A49), a predetermined program is executed from step A28 to reach steps A32 and A33.

In the above embodiment, the timer operation knob A (162
In A) and B (162B), common terminal part 2
7, and the first to eighth signal terminal portions 28a
From 1 to 28h, timer time information was introduced to the microprocessor 60 in the form of parallel bit signals.
It is also possible to sequentially introduce signals into the eighth signal terminal sections 28a to 28h and to introduce timer time information from the common terminal section 27 into the NT region of the microprocessor 60 in the form of serial bit signals.

Furthermore, in the above embodiment, the heater heating is controlled based on the set temperature of the temperature control knob 163, but a thermistor circuit that detects a specific temperature (for example, 250°C) and a
It is also possible to add a key to the BLOCKB frame and operate the key to fix the control reference temperature to the above-mentioned specific temperature and execute heater heating. In this case, the thermistor of the thermistor circuit can also be used as the thermistor 70 of the embodiment.

Furthermore, in the above embodiment, the knob-compatible switches A (80A) and B (80B) are of the push button type,
The movable parts A (164A) and B (164B) are timer operation knobs A (162A) and B (162
Although the knob-compatible switches A (80A) and B (80B) protrude from the switch B), the switches A (80A) and B (80B) may be electrostatic type switches or the like.

Furthermore, the present invention includes any modifications within the scope of the invention.

As is clear from the above description, the electronically controlled cooking appliance of the present invention has a heating energy generating means, a displaceable operating knob, and a timer that outputs timer time information according to each position of the operating knob. means, a sub-operation section disposed on the operation knob and operated simultaneously when the operation knob is operated, a switch means provided corresponding to the sub-operation section and detecting operation of the sub-operation section, and a switch means for detecting operation of the sub-operation section; Since the control means inputs and processes the timer time information according to the output and drives the heating energy generating means based on the timer time information when heating is started, mechanical vibration is generated and the operation knob of the timer means is turned off. Even if new timer time information that is undesirably displaced is output, the control means does not recognize such information as a new timer time, so the timer time is not set against the operator's will, and the operator You can perform cooking etc. according to the instructions. Moreover, since the sub-operation section can be operated at the same time as the operation knob is operated, there is no need to separately operate the sub-operation section, and the operability is extremely good.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a microwave oven according to an embodiment of the present invention, Fig. 2 is a front view of the display section of the microwave oven, Fig. 3 is a front view of the operating section of the microwave oven, and Fig. 4 is a front view of the microwave oven. FIG. 5A is a partially exploded perspective view of a signal generator used in a range; FIG. 5A is a developed view of a conductive pattern for explaining the signal generator; FIG. 5B is a diagram of FIG.
FIG. 6 is an electric circuit diagram of the microwave oven, and FIG. 7 is a flowchart showing an execution program of the microwave oven. 80A, 80B...Knob compatible switches A, B,
30...Microprocessor.

Claims (1)

[Claims] 1. A heating energy generating means, a timer means having a displaceable operating knob and outputting timer time information according to each position of the operating knob, disposed on the operating knob and operated simultaneously when the operating knob is operated. a sub-operation section, a switch means provided corresponding to the sub-operation section for detecting the operation of the sub-operation section; input processing of the timer time information according to the output of the switch means; An electronically controlled cooking appliance characterized by comprising a control means for driving the heating energy generating means based on information.