JPS6217716B2 - - 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, in conventional cookers of this kind, the timer time is input and set by operating numeric keys from 0 to 9 and a function key for assigning meaning to the numeric key input as the timer time. As described above, input operations are quite complicated for operators who are not familiar with the many key operations and the arrangement of numerical keys.

Furthermore, according to the prior art, the timer time input by the above key operation is initially displayed on the display means;
After the start of heating, the timer time decreases with the passage of time, and therefore, for example, it is not possible to re-acknowledge the first time inputted timer time when heating ends.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to overcome the above-mentioned drawbacks and to prevent incorrect setting of the timer time by means of an improved timer 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, 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],
13 minutes and 30 seconds on the timer time display is displayed as [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 side of the control pulse 13. Timer operation knobs A (162A) and B (162B) are also rotatable, and a "0" scale indicating the origin position and a scale at equal intervals of 5 minutes are printed and displayed up to 60 minutes along the rotation circumference. ing.

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 rotating 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 rotating 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 set to the 0 position on the left and the 0 position on the right end, as shown in Fig. 5A. If the 0th and 240th positions are further divided into 1st to 239th positions at equal intervals, the common path 30 will extend over the entire range from the 0th position to the 240th position. The conductive surface is exposed, and the first signal path 31a is the (N ₁ +
4M ₁ ) position (N ₁ = 1, 2, M ₁ = 0 to 59), the second signal path 31b is the (N ₂ + 8M ₂ )
Each position represented by the position (N ₂ = 2 to 5, M ₂ = 0 to 29), the third signal path 31c is the (N ₃ +16M ₃ ) position (N ₃ = 4 to 11, M ₃ = 0 to 14) ), the fourth signal path 31d is at the (N ₄ +32M ₄ ) position (N ₄
= 8 to 23, M ₄ = 0 to 7),
The fifth signal path 31e is at the (N ₅ +64M ⁵ ) position (N ₅ = 16
~47, each position represented by M ₅ = 0 ~ 3), the 6th
The signal path 31f is at the (N ₆ +128M ₆ )th position (N ₆ = 32~
95, _M6 = 0, 1), the seventh signal path 31g corresponds to each position represented by the _N7 position ( _N7 = 64 to 191), and the eighth signal path 31h corresponds to each position represented by the _N8 position ( _N8 = 128 to The conductive surface is exposed only at each position indicated by 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 signals 31a,
Since the conductive surface is exposed only on 31d, the first and fourth signal path terminal portions 28a' and 28 of both 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 status 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, the 8-bit code corresponding to each position of the brush 24' Although a signal is obtained, the signals corresponding to adjacent positions have changed by only one bit, and therefore, such a 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 of 0 to 60 minutes displayed around A and 162B is divided into 240 equally spaced microscales, a code signal corresponding to 15 seconds per unit microscale 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 the DC power supply voltages V _C and -V _D distributed to each part of the circuit described above and the circuit described below, as shown above. A heater voltage V _f and a 60Hz signal voltage TB to the tube are generated, respectively.

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.

I ^C1 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 above power is turned on, the rise of the DC power supply voltage V _C is the terminal
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.

INT is an interrupt terminal, and the 60 Hz signal TB is shaped into a 60 Hz pulse signal by a waveform shaping circuit 65 consisting of transistors, diodes, capacitors, 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 _S1 ~ _{OD S7} are display output terminals, and OD _G1 ~ _{OD G5}
are input/output control terminals, and the outputs of these terminals are input to the display section 15 described above. The display section 15 displays OD _S1 to OD _S7 as segment selection signals and OD _G1 .
~OD _G4 is used as a digit selection signal for each digit of the number and is performed in a well-known time division manner. That is, for example, when there is an output at terminal OD _G2 , terminals OD _S2 , OD _S3 ,
If there is output on OD _S4 , OD _S5 , or OD _S6, the number "2" will be displayed in the second digit. Further, OD _S7 and OD _G5 are used as a colon selection signal and a colon digit selection signal, respectively.

Each terminal output of OD _G1 to OD _G5 is applied to five column lines of key matrix 66 on the other hand.

I ^K1 to I ^K4 are key signal input terminals, each of which is connected to four row lines of the key matrix 66.

Each key switch of the operation section 16 (FIG. 3) is cross-connected to a predetermined intersection of the column lines and row lines that constitute the key matrix 66, and when a key operation is performed on the operation 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 I ^K1
A signal is input to those connected to the row line among ~I ^K4 .

The microprocessor 60 therefore has terminals OD _G1 ~
The operated key is determined by checking the state of the input signals to the terminals I ^K1 to I ^K4 in synchronization with each output signal of the OD _G5 .

OD ₆ is a timer time A control output terminal, OD ₇ is a timer time B control output terminal, I ^T1 to ^{I T8} 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, I ^T1 to I ^T8
to the first to eighth signal terminal portions 28a of each signal generator.
~28h output signal is input.

I ^C2 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 the terminal I ^C2 . . 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 I ^C2 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 from the terminal OT, and after a slight delay, outputs an output 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
OT2 area, 1-digit FKB area, 1-bit FLG1
~ Each area of FLG11. The above CLOCK area stores the current time, the TIME1 area and TIME2 area store each timer time related to timer operation knob A (162A) and timer operation knob B (162B), respectively, and the DISPLAY area stores the CLOCK area and
It is used as an output buffer for outputting the contents of the TIME1 and TIME2 areas to the display section 15.
Each area of FLG1 to FLG11 is used as a flag for control, with the FLG1 area indicating that there has been a change in the position of the timer operation knob, and the FLG2 area indicating whether or not the display unit 15 is displaying the current time. ,
The FLG3 area indicates whether or not a key operation has been performed.
The areas are "Microwave Strong" and "Microwave Weak A"
The FLG5 area shows which key of "Microwave Weak B" and "Heater" was operated.The FLG6 area shows which key of "Microwave Weak B" and "Heater" was operated.The FLG6 area shows which key of "Microwave Weak B" and "Heater" was operated.
2B) for each timer time reading distinction, FLG7
The areas are BLOCK A and BLOCK B of the operation unit 16.
FLG8 indicates whether any of the keys in
The area indicates which BLOCK, BLOCK A or BLOCK B, was operated first.
The FLG9 area stores whether the keys of both BLOCKs have been operated, the FLG10 area stores whether heating is being performed or not, and the FLG11 area stores whether the door 14 is opened during heating.

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 judgment 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 the input signal to the terminal RESET of the microprocessor when the 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 and all other areas of the RAM except the above time-related areas are cleared.

Steps A3 and A21: An output is generated at the output terminal OD ₆ of the microprocessor, and an 8-bit signal corresponding to the position of the timer operation knob A (162A) is generated from the signal generator A (20A) at this time.
It enters the input terminals I ^T1 to I ^T8 of the microprocessor.

A4, A12, A22, A45 steps: The signals that enter the microprocessor input terminals I ^T1 to I ^T8 remain as they are.
Stored in NT area.

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

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

A7, A15, A36, A52 steps: The contents of the NT 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 the 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.

A9, A38 step: The value that enters the TIME1 area in A8, A37 step is the timer operation knob A.
(162A) corresponds to the number of minute scales from the origin, and the unit minute scale corresponds to 15 seconds, so in the following steps A9 and A38, such TIME1
The contents of the area are multiplied by 15. That is, by this
The contents of the TIME1 area are timer operation knob A (16
The timer time corresponding to the position 2A) is expressed in seconds. For example, if the operating knob is at the 5 minute 30 second position, the contents of the TIME1 area will be [0330].

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

Steps A11 and A44: An output is generated at the output terminal CD 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 output. It enters input terminals I ^T1 to I ^T8 .

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

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

Steps A16 and A53: Similar to 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 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 TIME2 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 DISPLAY
transferred to the area. After such transfer, the contents of the CLOCK area are preserved.

A24 step: It is determined whether the contents of the NT area and the OT1 area are equal.

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 OD _G1 to _{OD G5} , and in synchronization with the outputs of these terminals OD _G1 to _{OD G4} , the contents of each digit in the DISPLAY area are code-converted to the display output terminals OD _S1 to _{OD S7.} is output to. Note that, at this time, display of unnecessary 0's at the higher level is suppressed. or
The contents of the FLG2 area are checked and if it is 0, an output is generated at the terminal OD _{S7 in synchronization with the output of the control terminal OD G5 to} display the current time, and a colon is displayed on the display section 15. On the other hand, if there is a key operation on the operation unit 16, it is detected through the key signal input terminals I ^K1 to I ^K4 , and the code corresponding to the key is detected.
It is stored in the FKB area, and 1 is written in the FLG3 area to remember that a key operation has occurred.

A40, B27 steps: The contents of the TIME1 area
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.

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

A56, B25 steps: The contents of the TIME2 area
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's output terminals OL _A and OL _S 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, and C37: The open/closed state of the door 14 is checked through the input terminal I ^C1 of the microprocessor.

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

B7, B16 steps: Generate output at 30% duty at the microprocessor's output terminal OM.

In other words, when performing heating with microwaves, as will become 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 Turns on the output terminal OM, then turns off the output of the output terminal OM when passing the above step after 3 seconds has elapsed, and then turns on the output of the output terminal OM again when passing the above step after 7 seconds have elapsed,
Thereafter, this process 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 I ^C
Check whether there is an input to ² , and if it is present, turn off the output of the output terminal OH, and if it is not, turn it on.

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

B10 step: It is determined whether the contents of the TIME2 area have become 0.

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

B17 step: Microprocessor output terminal
OM output turns on.

B18 step: Similar to B9 step, the contents of the TIME1 area are decremented every second.

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 to 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], [Microwave Weak A], or [Microwave Weak B]. ,〔heater〕,
It is determined whether it corresponds to any key of [CLOCK FAST]. If neither of these is the case, press the [CLOCK, SLOW] key and move to step C11.

C11, C12 steps: In these steps
Changes the contents of the CLOCK area faster than normal.

In other words, since the least significant digit of the CLOCK area is in units of one minute, it is normally updated every minute, but in the C11 step, this update is done every second or second.
The C12 step is performed every 0.5 seconds.

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

[] Starting electricity and setting time First, when electricity starts to be applied to the microwave oven, the program goes through steps A1 to A23 and reaches step A24. At this time, the timer time read in each step of A6 and A22 is the timer operation knob A (16
2A) is the same unless you change it, so A24
After step A25, A26, A28 to A30 are passed to step A31. Now operation section 16
Assuming that there are no keystrokes in
From step A31, the process goes through steps A32 and A33, returns to step A19, and reaches step A20. At this time, the contents of the FLG6 area have already become 1 at step A26, so the program then moves to step A44.
Reaching the steps. The timer times read in each step of A14 and A45 are the same unless timer operation knob B (126B) is moved, so after step A47, each step of A48 and A49 is obtained, and the process returns to step A28. Similarly, the program is the first loop of A19-A26, A28-A33, or A19, A20, A44-A49, A28-
Cycle through the second loop of A33 alternately. In this circulation process, the contents of the CLOCK area are moved to the DISPLAY area at step A19, and then the contents of the CLOCK area are transferred to A28.
It is displayed on the display section 15 in steps. This is a time display, but since the time has not been set, the displayed time is incorrect.

Then, to set the time, click [CLOCK].
When you press the [FAST] key or the [CLOCK SLOW] key, the key operation is detected at step A31 in the above circulation process, and the program starts at step A31.
Enter step C1, then move to C2~
Proceed through each step of C10, and then return to step A19 via step C11 or C11. Therefore, as long as the [CLOCK FAST] or [CLOCK SLOW] key is held down, the program will continue from A19 to A26.
(or A19, A20, A44~A49), A28~A31, C1
~Cycle through each step of C10, C11 or C12,
During this time, the display time on the display section 15 changes rapidly.

When the press of the key is released when the displayed time becomes correct, the program cycles through the first loop or the second loop again, and the display section 15 displays the correct current time from then on. 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 (600W) microwave, followed by 40 minutes of low power (180W) microwave heating, First, use the timer operation knob A (162
Adjust A) and B (162B) to the 25 minute and 40 minute scale positions, respectively.

For example, if timer operation knob A (162A) is operated first, such timer operation is detected at step A24 in the standby state, and the program then passes through steps A27 to A32 and A34 to A43. In other words, the new timer time information "25 minutes" is
Stored in the TIME1 area at step A39, and also stored in A40
It is also transferred to the DISPLAY area in the step, and
At step A41, only indicator lamp A (161A) is lit. The program is then A20, A44
~A49, A28~A33 third loop, and A20~
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 display lamp A (161
A) is lit, indicating that the content displayed on the display section 15 is time information regarding timer operation knob A (162A).

Next, when timer operation knob B (162B) is operated, such operation is detected at step A47 in the circulation process of the third loop, and the program then proceeds to steps A50, A28-A32, A34, A51-A58, and A43. go through. That is, the new timer time information "40 minutes" is stored in the TIME2 area at step A55, transferred to the DISPLAY area at step A56, and then transferred to display lamp B (16 minutes) at step A57.
1B) is lit. The program then alternately cycles through the third and fourth loops, and during this time, "40 minutes" is similarly displayed as timer time information, and display lamp B (161
B) is lit, indicating that the content displayed on the display section 15 is time information regarding timer operation knob B (162B).

The timer operation knobs A and B can be operated in any order, and the time information indicated by the 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 displayed. 15, and the display lamp A
(161A) or B (161B) lights up to indicate which knob the content displayed on the display section 15 corresponds to.

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

The "Microwave Strong" key operation is detected at step A31 in the circulation process of the third and fourth loops, and the program then proceeds to C1-C5, C13,
After each step of C15~C17, A40~A42,
At this time, in step C13, the fact that the ``microwave strong'' key was pressed is memorized, and in step C17, the fact that any one key in the BLOCK A frame of the operation section 16 was pressed is memorized, and in step A40
At step A41, the contents of the TIME1 area are transferred to the DISPLAY area, and only display lamp A is lit at step A41. As long as you keep operating the "Microwave Strong" key, the program will then be A20, A44
~A49, A28~A31, C1~C5, C13, C15,
C16, C18, A40~A43 loop or A20~
A26, A28~A31, C1~C5, C13, C15, C16,
C18, A40~A43 loop alternately, and when the above key operation is stopped, A20~A26, A28~
4th loop of A33, or A20, A44-A49, A28
The third loop of ~A33 is alternately circulated, and in this circulation process, the timer operation knob A (162
The time information specified by A) is displayed on the display section 15, and the display lamp 161A is lit.

The subsequent "microwave weak B" key operation is detected at step A31 in the circulation process of the third and fourth loops, and the program then moves from C1 to C1.
Steps C7, C23, C25~C28, A56~A58, and A43 are passed, and at this time, the operation of the "microwave weak B" key is memorized at step C23, and the BLOCK A of the operation section 16 is activated at step C28. ,
It is remembered that the keys in each frame of BLOCK B were operated together, and the contents of the TIME2 area are transferred to the DISPLAY area at step A56, and the contents of the TIME2 area are transferred to the DISPLAY area at step A57.
In this step, only indicator lamp B is lit.
As long as you keep operating the "Microwave weak B" key,
The program is then A20~A26, A28~A31,
C1~C7, C23, C25, A56~A58, A43 loop or A20, A44~A49, A28~A31, C1~
C7, C23, C25, A56~A58, A43 loop alternately, and when the above key operation is stopped, A20
~A26, A28~A33 fourth loop, or 20,
The third loop of A44 to A49 and A28 to A33 is alternately circulated, and during this circulation process, the time information indicated by the timer operation knob B (162B) is displayed on the display section 15, and the display lamp 161B is lit. .

The content of the FLG ₈ area remains 0 by operating the above-mentioned "Microwave Strong" key and "Microwave Weak B" key in sequence. This means that the key in the B frame was operated before the key.

The last "START" key operation is detected at step A31 in the cyclic process of the third and fourth loops, and the program then moves through C1 to C4 and C37.
Go through each step of ~C40. At this time,
The first transistor 55 is turned on at step C39. The program will then start with A20-A26 (or
A20, A44~A49), A28~A30, B1, B5,
Each step of B15, B17~B19, B24, B27, B28, and A31 has passed, and at this time, the second step is taken at step B17.
Transistor 56 turns on, and magnetron 45 therefore starts oscillating.

If the [START] key continues to be operated, the program enters step C1 after step A31, then steps C2 and C3, moves to step A32, and returns to step A20 from step A33.

After the A31 step when the above key operations are no longer performed.
After going through steps A32 and A33, it returns to step A20, and then steps A20, A44~A49, A28~A30,
B1, B5, B15, B17~B19, B24, B27, B28,
A31~A33 loop or A20~A26, A28~
A30, B1, B5, B15, B17~B19, B24, B27,
Cycle through the loops of B28 and A31 to A33 alternately.
At this time, the contents of the TIME1 area are set to 1 at step B18.
It is decremented every second, and its contents are moved to the DISPLAY area at step B27 and displayed as the timer remaining time at step A28. Also, because the B28 step has passed, the indicator lamp A (161
A) is lit, indicating that the display content on the display section 15 is related to timer operation knob A (162A). Furthermore, during this time, the first
Since the second transistors 55 and 56 both remain on, the magnetron 45 has a 100% duty, that is, continuously oscillates, and outputs 600 W of microwaves.

In the above circulation process, the timer time is ``25 minutes''.
has passed and the remaining time on the timer reaches 0, B19
The step detects it and the program then selects B20-B26, A31-A33, A20-A26 (or
A20, A44-A49), A28-A30, B1, B5, and then B6 step. That is, this means that the 25 minutes of intense microwave heating has ended.

The program is then B7, B9, B10, B24 ~
After passing through each step of B26, A31-A33, thereafter, A20-A26, A28-A30, B1, B5-B7, B9,
B10, B24~B26, A31~A33 loop or
A20, A44~A49, A28~A30, B1, B5~B7,
Cycle through the loops of B9, B10, B24-B26, and A31-A33 alternately. At this time, at step B9
The contents of the TIME2 area are decremented every second, and the contents are moved to the DISPLAY area at step B25 and displayed as the timer remaining time at steps A28. Further, since the B26 step has passed, the display lamp B (161B) is lit, indicating that the content displayed on the display section 15 is related to the timer operation knob 162B. Furthermore, during this time, the magnetron 45 oscillates with a duty of 30% by passing through the B7 step.
Outputs 180W microwave.

In the above circulation process, the timer time is ``40 minutes''.
has passed and the remaining time on the timer reaches 0, B10
It is detected in step B11, B12, B29, B30 and then the program returns to A2.
Reaching the steps. That is, as a result, the first to third transistors 55 to 57 are all turned off, and the buzzer 62 notifies that the 40 minutes of weak microwave 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, select "Microwave weak B", "Microwave strong",
Each "START" key is operated in sequence.

The program passes through steps C7, C23, C25, C26, C29, and 30 by pressing the "Microwave Weak B" key, and C5, C13, C15, C16, C18, and C19 by pressing the "Microwave Strong" key. Each step passes, so if you press the "START" key, it will be the same as in [] above, but
The heating execution order is reversed, and the duty is 30 first.
% microwave heating is performed, and then microwave heating is performed at a duty rate of 100%.

[] Strong microwave heating → Heater heating If you do not use strong microwaves for 20 minutes and then use the heater to cook for 30 minutes at a temperature of 200°C, first operate the timer as in the case [] above. Knob A (162A) and B
(162B) to the 20 minute and 30 minute scale positions, respectively, and set the temperature control knob 163 to 200 minutes.
Adjust to the ℃ scale position, then press the keys in the order of "Microwave Strong", "Heater", and [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"
By key operation, high-output microwaves are first generated for 20 minutes in the same way as in case [] above.
After that, the program is A20-A26, A28-A30,
B1, B5, B6, B8~B10, B24~B26, A31~
A33 loop or A20, A44~A49, A28~
A30, B1, B5, B6, B8~B10, B24~B26,
Cycle through loops A31 to A33 alternately. At this time, the remaining time of the timer is similarly displayed, and the display lamp B (161B) is lit. The other day B8
By passing through the step, the heater 47 is heated when the temperature of the cooking chamber 12 is below 200°C, and is deenergized when the temperature exceeds 200°C, so that the temperature of the cooking chamber is maintained at approximately 200°C.

In the above circulation process, the timer time is ``30 minutes''.
When , the heater heating ends in the same way,
Furthermore, the buzzer 62 notifies that all operations have been completed, and the microwave oven then enters the standby state described above.

[] Heater heating → Strong microwave heating To perform microwave heating with strong output after heating the heater in the reverse order to the above [], turn the timer operation knobs A and B in the same way as in the case [] above.
After setting the appropriate timer time and temperature using the and temperature control knobs, the "heater", "microwave strength", and "START" keys are sequentially operated.

The program is executed by pressing the “heater” key.
After passing each step of C8, C24~C26, C29, and C30, by pressing the "Microwave Strong" key.
Steps C5, C13, C15, C16, C18, and C19 are passed, so when the START key is pressed, 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, then [Microwave weak A], [Heater],
It is now clear that each [START] key can be operated in sequence.

[] Heater heating → Microwave weak heating In the reverse order of the above [], that is, after heater heating,
To perform microwave heating with low output, similarly, after setting the appropriate timer time and temperature, operate the [Heater], [Microwave Low A], and [START] keys in sequence. It's clear now.

[] Single 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''. All you need to do is to operate each key, and to only heat the heater, set the time and temperature using the timer operation knob B and the temperature adjustment knob, followed by "heater".
It is now clear that each "START" key can be operated in sequence.

[] Clear operation Regardless of whether the microwave oven is heating or not, the program always passes through steps A28 and A31, so if you operate the "CLEAR" key on the operation unit 16 at any time, the program will be cleared. teeth
After passing through steps A31, C1, and C2, the microwave oven returns to step A2 and enters the standby state unconditionally.

[] Interruption of heating execution Opening the door 14 of the microwave oven will not affect the control operation of the microprocessor in any way even if it is done when heating is not in progress, but if it is opened while heating is in progress, heating execution will be interrupted. be done.

That is, during heating, the program passes through step B1, so when the door is opened, steps B1 to B4 are passed, and at this time, heating is stopped at step B4, and as long as the door remains open, the program continues. A20~A26 (or A20, A44~
A49), A28, A29, and A60 loops, and during this time, the timer's timing operation is suspended.

Then when the door is closed the program will
A20~A26 (or A20, A44~A49), A28,
After cycling through the loop of A29, A60, A61, A64, and A33, when the "START" key is pressed, the program passes through each step of A60 to A63 and A70, and enters step C39, thus restarting the above heating execution. be done.

In the above embodiment, the timer operation knob A (162
In A) and B (162B), a signal is introduced into the common terminal section 27, and the first to eighth signal terminal sections 2
The timer time information is introduced into the microprocessor 60 in the form of parallel bit signals from 8a to 28h, but the signals are sequentially introduced to the first to eighth signal terminal sections 28a to 28h, and the timer time information is input from the common terminal section 27. It is also possible to introduce it into the NT area of the microprocessor 60 in the form of a serial bit signal.

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 BLOCK B 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.

Now, in the above case [], if the door is opened during heating and the timer operation knobs A (162A) and B (162B) are operated during the opening, as described above, A20 to A26 (or A20, A44～
A49), A27 during loop circulation of A28, A29, A60
Or at each step of A50 it will be memorized and then when you close the door the program will be A60, A61, A64,
Since each step of A65 and A66 (or A67) has passed, new timer time information enters the OT ₁ or OT ₂ area. After that, when you operate the "START" key, the program goes through steps A62, A63, A70, C39, C40, and A20, and then reaches step A24 or A47, and changes in the timer time information can be checked at these steps. , the new timer time information by operating the timer operation knob above is already in A66 or
Since the program enters the OT ₁ or OT ₂ region at step A67, it is determined that there is no change at step A24 or A47, and the program then moves to step B1 via step A30, and heating execution is resumed. Therefore, as mentioned above, the door is opened during heating,
If the timer control knob is moved while it is open, such changes will be completely ignored.

The present invention thus provides a cooking chamber having a door, a means for detecting the opening of the door, a heating energy supply means for supplying heating energy to the cooking chamber, and a timer which is movable and adapted to each position. comprising a timer means for outputting time information, and a control means for setting the timer time information in a predetermined storage area and driving the heating energy supply means based on the content set in the storage area when heating is started, The control means detects a change in timer time information when there is a displacement of the timer means, sets new timer time information in the storage area, and performs the setting operation during heating. This prohibits the displacement of the timer means when the door is detected to be open, so even though it is electronically controlled, when inputting and setting the timer time, it does not require any complicated key operations as in the past. It is possible to provide a cooking appliance with excellent operability by simply setting and operating the timer means to a desired position without any hassle.

Furthermore, according to the present invention, since the timer means remains at its original position after heating has started unless the timer means is moved, it is very convenient to be able to reconfirm the initially inputted timer time at any time by reading its position.

Furthermore, according to the present invention, even if the door is opened during heating and the timer means is displaced during the opening, such displacement is completely ignored, and therefore, the cooking operation is performed while the door is opened. Even if the timer means is undesirably displaced due to vibrations caused when objects are put in or taken out or when the door is subsequently closed, the contents of the storage area are not affected, and such undesired erroneous setting of the timer time can be prevented. can.

Further, according to the present invention, after the start of heating, the contents of the storage area are counted down and the contents are displayed on the display means, so that the remaining time of the timer can be confirmed.

[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. 19...Operation knob, 60...Microprocessor.

Claims (1)

[Claims] 1. A cooking chamber having a door, means for detecting opening of the door, heating energy supply means for supplying heating energy to the cooking chamber, and a timer that is movable and has a timer corresponding to each position. a timer means for outputting information; and a control means for setting the timer time information in a predetermined storage area and driving the heating energy supply means based on the content set in the storage area when heating is started, The control means detects a change in the timer time information when there is a displacement of the timer means, sets new timer time information in the storage area, and performs the setting operation by the detection means during heating. An electronically controlled cooking appliance characterized in that displacement of the timer means is prohibited in a door open detection state. 2. The electronically controlled cooking appliance according to claim 1, wherein the time information generated by the timer means is represented by a code signal. 3. A cooking chamber having a door, means for detecting opening of the door, heating energy supply means for supplying heating energy to the cooking chamber, display means, and a timer that is movable and displays time information according to each position. A timer means for outputting and the timer time information are set in a predetermined storage area, and when heating is started, the heating energy supply means is driven based on the contents set in the storage area, and the contents of the storage area are sent as a time signal. and a control means for counting down by the timer and displaying the content as the timer remaining time on the display means, and the control means detects a change in the timer time information in response to a displacement of the timer means. The method is characterized in that new timer time information is set in the storage area and such setting operation is prohibited for displacement of the timer means when the door opening is detected by the detection means during heating. Electronically controlled cooker. 4. The electronically controlled cooking appliance according to claim 3, wherein the time information generated by the timer means is represented by a code signal.