JP3226714B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved heating cooker capable of oven cooking and toaster cooking.

[0002]

2. Description of the Related Art As is well known, in a heating cooker capable of oven cooking and toaster cooking, a heater is provided on the ceiling of the cooking chamber, and the oven is cooked at the time of oven cooking and toaster cooking. The heater is energized to cook the food to be heated.

[0003]

By the way, in the above-mentioned conventional apparatus, a heater having a heat generating capacity such that the object to be heated is not excessively burned during oven cooking is usually used. However, in this,
Since the amount of heat generated per unit area of the heater is small, there is a problem that it takes a long time to bake a bread (bread) to be heated during toaster cooking.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to cook food to be heated without overheating in oven cooking, and to use the cooking material in toaster cooking. An object of the present invention is to provide a cooking device capable of shortening the cooking time.

[0005]

A first means is provided with a main body having a cooking chamber for accommodating an object to be heated, and provided on a ceiling of the cooking chamber at a position forward of a center of the ceiling. A front heater provided on the ceiling of the cooking chamber at a position deeper than the center of the ceiling, and having a larger heating capacity than the front heater;
A front-side temperature detecting means provided beside, and a back-side heater;
A back side temperature detecting means provided in the vicinity;
Response to the temperature detection results from the
Control for controlling the front heater and the rear heater.
Control means (the invention of claim 1).

[0006]

A second means is the first means, wherein the front heater and the back heater are constituted by tube heaters, and a lower heater is disposed at the bottom of the cooking chamber, so that when toaster cooking is set. characterized in was so as to generate heat the lower heater causes primarily heating the rear side heater of the front heater and the rear side heater (claim 2
Invention).

A third means is that, in the first means, when the control means sets oven cooking or grill cooking, the temperature detected by the back side temperature detecting means becomes higher than the temperature detected by the front side temperature detecting means. It is characterized in that the input of the rear heater is sometimes lowered and the input of the rear heater is increased when the temperature detected by the rear temperature detecting means becomes lower than the temperature detected by the front temperature detecting means. The invention of claim 3 ).

A fourth means is the first means, wherein the height detecting means for detecting the height of the cooked food, and the means for changing the duty ratio to the front heater in accordance with the detection result by the height detecting means. (The invention of claim 4 ).

[0010] A fifth means is the first means and has having characterized in that provided and lighting at the site of the front heater close between the front heater and the rear side heater (claim 5 invention).

A sixth means according to the first means, wherein a lower heater is provided at the bottom of the cooking chamber, and when a cooking temperature is set in oven cooking, an input to the front heater is changed according to the set cooking temperature. And a means for changing the input to the lower heater is provided (the invention of claim 6 ).

[0012]

In the first means, the front heater is provided, and the back heater having a heating capacity larger than the heating capacity of the front heater is provided. Therefore, in the case of oven cooking which does not require a large amount of heat, the first means is provided. However, it is possible to obtain a heating power suitable for oven cooking by heating mainly by the front heater, and to heat the toaster by heating mainly by the back heater when toaster cooking requires a relatively large amount of heat. Strong heating power suitable for cooking can be obtained. As a result, it is possible to cook the food to be heated without overbaking the food during oven cooking, and to shorten the time required to heat the food to be heated during the toaster cooking. In addition, since a heater having a large heat generating capacity is provided on the back side of the cooking chamber, the front side of the cooking chamber does not become excessively hot, which is convenient for putting in and out the food to be heated. In addition, the front heater is provided at a position forward of the center of the ceiling, and the back heater is provided at the ceiling of the cooking chamber at a position deeper than the center of the ceiling. It is possible to prevent as much as possible that only a specific portion in the cooking chamber is heated unlike the case where the components are concentratedly arranged. Furthermore, before
The temperature of the front heater is detected by the
The temperature of the back heater is detected by the back temperature detecting means.
Is output, and the front heater and the
Control of the front and rear heaters.
It is also possible to equalize the amount of heat generated by the
You.

[0013]

In the second means, since the front heater and the rear heater are constituted by tube heaters, radiant heat can be satisfactorily applied to the object to be heated, and a lower heater is provided at the bottom of the cooking chamber. When the toaster cooking is set, the front heater and the rear heater mainly generate heat at the rear heater and the lower heater generate heat, so that the bread to be heated can be cooked in a short time with good scorching. Can be cooked so that it is cooked.

In the third means, when the oven cooking or the grill cooking is set, the control means controls the rear heater when the temperature detected by the rear temperature detecting means becomes higher than the temperature detected by the front temperature detecting means. When the input is lowered and the temperature detected by the rear temperature detecting means becomes lower than the temperature detected by the front temperature detecting means, the input of the rear heater is controlled to be increased, so that the temperature of the rear heater is also controlled by the front heater. It can be changed in the same manner as the temperature of the portion, and can contribute to uniform heating.

In the fourth means, the duty ratio of the front heater is changed in accordance with the result of detection by the height detecting means, so that heating can be carried out without excess or shortage in accordance with the height of the food to be heated.

In the fifth means, an illumination lamp is provided between the front heater and the rear heater and at a position near the front heater, so that the whole cooking room can be illuminated so that it can be easily viewed. .

In the sixth means, a lower heater is provided at the bottom of the cooking chamber, and when a cooking temperature is set in oven cooking, the input to the front heater is changed according to the set cooking temperature and the lower heater is changed to the lower heater. Since the means for changing the input is also provided, it is possible to prevent a sharp change in the rise and fall of the temperature, to achieve good temperature control, and to further contribute to uniform heating.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIGS. 1 to 4
, The main body 1 is configured by disposing an inner box 3 inside an outer box 2, and the inside of the inner box 3 is a cooking chamber 4. On the front of the main body 1, a door 5 for opening and closing the cooking chamber 4 is provided.
Is provided, and an operation panel 6 is provided on a side thereof. The operation panel 6 is provided with various switches 7 such as a menu selection switch such as an oven cooking selection switch, a grill cooking selection switch, a toaster cooking selection switch, a range cooking selection switch, a cooking time setting switch, and a cooking temperature setting switch. Along with
A start switch 8 is provided, and further, an indicator 9 for displaying cooking contents, cooking time, and the like is provided. The temperature setting by the cooking temperature setting switch is set to “100 ° C.” or “150 ° C.” when oven cooking is selected.
° C ”,“ 200 ° C ”, and“ 250 ° C ”.

A rotating plate 10 is provided on the bottom plate 4 a of the cooking chamber 4, and the rotating plate 10 is driven to rotate by a turntable motor 11. Further, the top plate receiver 12,
12 are provided, and transmission type optical sensors 13 and 14 as height detecting means are provided. The optical sensors 13 and 14 include light-emitting elements 13a and 14a and light-receiving elements 13b and 14b opposed thereto, respectively.

On the other hand, as shown in FIG. 3, a machine room 15 is formed by the outer box 2 and the inner box 3 on the back side of the operation panel 6. Is provided with a magnetron 16 for supplying microwaves, and a high-voltage transformer 1 for driving the magnetron 16 is provided.
7. A cooling fan device 18 for cooling the magnetron 16 and the like is provided. The cooling fan device 18 includes a cooling fan motor 19 and a fan 20.

On the ceiling 4b of the cooking chamber 4,
The front heater 21 is located forward of the center of the ceiling 4b.
, And a back side heater 22 is provided at a position deeper than the central portion. Each of the front heater 21 and the rear heater 22 is formed of a tube heater, and the rear heater 22 is set to have a larger heating capacity than the front heater. In this case, for example, the heat generation capacity of the front heater 21 is set to 500 W (watt), and the rear heater 22 is set to 800 W.

Further, reflectors 23 and 24 are disposed above the front heater 21 and the rear heater 22, respectively. Then, on the back surfaces of the reflection plates 23 and 24, which are portions near the front heater 21 and the back heater 22, respectively, a front temperature sensor 25 as a front temperature detection unit and a back temperature sensor as a back temperature detection unit. 26
Are thermally conductive. An illumination lamp 27 is provided between the front heater 21 and the rear heater 22 on the ceiling 4b and at a position close to the front heater 22.

Further, a cooking temperature sensor 28 is provided at an upper portion of the side plate portion of the heating cooking chamber 4 and at a substantially intermediate portion between the front heater 21 and the rear heater 22.
On the other hand, on the bottom outer surface of the cooking chamber 4, a lower heater 29 composed of a planar heater is provided.

Next, FIG. 5 shows an electrical configuration.
In the figure, a control circuit 30 includes a microcomputer and various A / D converters, and includes a detection signal from the optical sensors 13 and 14, various switches 7 and a start switch 8. , And temperature detection signals from the front temperature sensor 25, the back temperature sensor 26, and the cooking temperature sensor 28. Then, according to the program stored in the microcomputer, the control circuit 30 controls the turntable motor 11, the front heater 21, the rear heater 22, the lower heater 29, the cooling fan motor 19, the magnetron 16, In addition, the illumination lamp 27 is controlled via the drive circuit 31 and the display 9 is controlled. The drive circuit 31 has a relay or the like inside so that each load device can be disconnected.

Further, the control circuit 30 also functions as a control means, and its function will be described together with the operation of the above configuration. 6 to 9 show the control contents of the control circuit 30. The flowchart in FIG. 3 starts when a power plug (not shown) is connected to a power outlet.

First, in step S1, it is determined whether or not a switch signal has been given from the various switches 7, and if a switch signal has been given, setting is made in step S2 in accordance with the contents of the switch signal. Thereafter, in step S3, it is determined whether or not a switch signal has been provided from the start switch 8, and if a switch signal has been provided from the start switch 8, the process proceeds to step S4 to determine whether or not oven cooking has been selected. If the oven cooking has not been selected, the process proceeds to step S5 to determine whether grill cooking has been selected. If the grill cooking has not been selected, the process proceeds to step S6 to determine whether toaster cooking has been performed. .

If the oven cooking is selected, the process proceeds to step S7. If the grill cooking is selected, the process proceeds to step S8. If the toaster cooking is selected, the process proceeds to step S9. If cooking has been selected, the process proceeds to step S10. This range cooking is performed by the front heater 21, the rear heater 22, and the lower heater 29.
Not using (cooking using magnetron 16)
Therefore, the description is omitted. In the oven cooking, the object to be heated is entirely heated so as not to be too browned (for example, a sponge cake). In grill cooking, there is no problem even if the food to be heated is browned (eg, hamburger or grilled fish). Further, in toaster cooking, the bread is heated strongly while browning it moderately.

In step S7, the oven cooking control shown in FIG. 7 is executed. That is, in step P1, the heater unit reference temperature HK is determined as shown in Table 1 according to the set cooking temperature KK, and the energization rate of the front heater 21 is determined. In this case, the conduction rate of the lower heater 29 is set to 100%.

[0030]

[Table 1]

For example, when the set cooking temperature KK is 250 ° C., the heater reference temperature HK is determined to be 400 ° C.
The duty ratio of the front heater 21 is determined to be 100% (continuous). For example, when the set cooking temperature KK is 200 ° C., the heater unit reference temperature HK is determined to be 380 ° C. Is determined to be “25/30”.
The energization rate of the back heater 22 is 100% in all cases.
(Continuous).

After step P1, the process proceeds to step P2, where the height of the object to be heated is determined based on the detection signals from the optical sensors 13 and 14. That is, the optical sensor 13
"Low" when a heated food detection signal is given from only
It is determined to be “high” when at least the detection signal of the object to be heated is given from the optical sensor 14. If it is determined to be "high," the process proceeds to step P3, where the front heater 2
1 is changed as shown in Table 2. As is clear from the comparison between Table 2 and Table 1 above, when the cooked food is “high”, the duty ratio (input) is changed to approximately 80% of the low case. As will be apparent from the following description, the duty ratio of each of the heaters 21, 22 and 29 shown in Tables 1 and 2 is determined by the front temperature sensor 25 or the rear temperature sensor 2.
6 has reached the heater unit reference temperature HK, or the cooking temperature KK set by the cooking temperature sensor 28.
Enabled after reaching.

[0033]

[Table 2]

After step P3, the process proceeds to step P4, in which the front heater 21 is energized and the rear heater 2 is energized.
2 is energized. FIG. 11 shows a temperature change of each unit and a control situation of each heater 21, 22, 29 when the set cooking temperature KK is 150 ° C. Less than,
The case where the set cooking temperature KK is 150 ° C. will be described. In this case, the heater reference temperature HK is determined to be 350 ° C.

The front heater 21 and the back heater 22
, The inside of the heating cooking chamber 4 is heated. If a predetermined detection cycle, for example, 30 seconds has not elapsed since the start of the heating cooking (determined in step P5), it is determined whether or not the cooking time set by the cooking time setting switch has elapsed (step P6). If all heaters 21, 22, 2
9 (step P7), and returns to the main routine.
If not, the temperature detected by the front temperature sensor 25 (referred to as “front temperature” in the flowchart shown).
Alternatively, it is determined whether or not the detected temperature of the back side temperature sensor 26 (referred to as “back side temperature” in the illustrated flowchart) exceeds the heater unit reference temperature HK (in this case, 350 ° C.) (step P8). If not, the detected temperature of the cooking temperature sensor 28 is equal to the set cooking temperature KK (in this case, 150
C)) is determined (step P9). If it is determined in step P9 that the detected temperature of the cooking temperature sensor 28 has exceeded the set cooking temperature KK,
The power is cut off at steps 1, 22, and 29 (step P10), and the routine goes to step P14 to be described later, and if not, returns to step P5.

If the above steps P5, P6, P8, and P9 are all "N", a closed loop of each of these steps is executed, that is, a time of 30 seconds is waited. When 30 seconds have elapsed (time t1 in FIG. 11), the flow shifts to step P11 where the temperature detected by the rear temperature sensor 26 is changed to the front temperature sensor 25.
It is determined whether or not the detected temperature is exceeded. If the temperature detected by the rear temperature sensor 26 exceeds the temperature detected by the front temperature sensor 25, the process proceeds to step P12, where the power to the rear heater 21 is cut off and the lower heater 29 is energized. In P13, the rear heater 21 is energized and the lower heater 29 is turned off.

By executing Step P11, Step P12 or Step P13 every 30 seconds, the temperature in the heating cooking chamber 4 is increased, and the front heater 21 and the rear heater 22 are increased. The temperature of the part also rises.

Then, the detected temperature of the front temperature sensor 25 or the back temperature sensor 26 exceeds the heater reference temperature HK ("Y" in step P8), or the detected temperature of the cooking temperature sensor 28 indicates the set cooking temperature KK. If it exceeds (“Y” in step P9), the control in step P14 and thereafter is executed. At time t2 in FIG. 11, the case where the temperature detected by the back side temperature sensor 26 exceeds the heater unit reference temperature HK is shown.

In step P14, it is determined whether or not the temperature detected by the front temperature sensor 25 exceeds the heater unit reference temperature HK. If not, the flow shifts to step P16 to energize the front heater 21 at the aforementioned energization rate.

Then, the program shifts to Step P17 to judge whether or not the detected temperature of the back side temperature sensor 26 exceeds the heater unit reference temperature HK. Blackout and lower heater 29
If not, the process proceeds to step P19 to energize the rear heater 22 and cut off the lower heater 29.

Then, in step P20, it is determined whether or not the detected temperature of the cooking temperature sensor 28 has exceeded the set cooking temperature KK, and if it has, the process proceeds to step P21 to turn off all the heaters 21, 22, 29. Electricity, step P2
After Step 2, the program returns to Step P20. That is, until the set cooking time has not elapsed, the process waits for the temperature in the heating cooking chamber 4 to drop. Thereafter, when the temperature in the cooking chamber 4 drops and becomes equal to or lower than the set cooking temperature KK, the process shifts to Step P23 to determine whether or not the set cooking time has elapsed. All heaters 21, 22,
29, the power is turned off, and the process returns to the main routine.

At time t3 in FIG. 11, the temperature detected by the front temperature sensor 25 has exceeded the heater reference temperature HK. At this time, the front heater 21 is turned off (at this time, the detection of the cooking temperature sensor 28). The temperature is equal to or lower than the set cooking temperature KK). Next, at the time point t4, the rear heater 22 has become lower than the heater reference temperature HK. At this time, the rear heater 22 is energized and the lower heater 2 is turned off.
9 is turned off.

Further, at time t5, the temperature detected by the front temperature sensor 25 becomes equal to or lower than the heater unit reference temperature HK. At this time, the power supply of the front heater 21 is controlled at the determined duty ratio. At time t6, the temperature detected by the back side temperature sensor 26 has exceeded the heater unit reference temperature HK. At this time, the back side heater 22 is turned off and the lower heater 29 is turned off.
Is turned on.

At time t7, the temperature detected by the cooking temperature sensor 28 exceeds the set cooking temperature KK. At this time, all the heaters 21, 22, and 29 are turned off at once. Thereafter, all the heaters 2 until the detected temperature of the cooking temperature sensor 28 becomes equal to or lower than the set cooking temperature KK, regardless of the detected temperatures of the front temperature sensor 25 and the back temperature sensor 26.
1, 22, and 29 remain disconnected.

At time t8, the temperature detected by the cooking temperature sensor 28 has become equal to or lower than the set cooking temperature KK. At this time, at this time, "N" is reached in step P20, and the process proceeds to step P14 via step P23. ,
The front heater 21 is provided with a front temperature sensor 2 corresponding to the front heater 21.
5 is higher than the heater unit reference temperature HK, so that the electric power remains off, and the back side heater 22 has the corresponding back side temperature sensor 26 below the heater unit reference temperature HK.
After "Y" in step P17, the flow shifts to step P19 to be energized.

As described above, in the oven cooking, the front heater 21, the rear heater 22, and the lower heater 29 are energized, but the front heater 21 and the rear heater 22 are controlled so as to have substantially the same input. The lower heater 29 is energized when the rear heater 22 is turned off. Thus, all the heaters 21, 22, 29 are not energized at the same time.

On the other hand, when grill cooking is selected in the main routine of FIG. 6, the process proceeds to step S8. FIG. 8 shows the control contents of step S8. First,
In step G1, the front heater 21 and the rear heater 22 are energized. Thereby, the cooking chamber 4
The inside is heated. While a predetermined detection cycle, for example, 30 seconds has not elapsed since the start of the heating cooking (determined in step G2), it is determined whether or not the cooking time set by the cooking time setting switch has elapsed (step G3). The power is turned off for both heaters 21 and 22 (step G4), and the process returns to the main routine. If the temperature has not elapsed, the detection temperature of the front temperature sensor 25 or the rear temperature sensor 26 is changed to the heater unit reference temperature HK '(in this case, Is determined (step G).
5) If not, it is determined whether or not the detected temperature of the cooking temperature sensor 28 has exceeded the cooking temperature KK 'set in advance (step G6). If it is determined in step G6 that the detected temperature of the cooking temperature sensor 28 has exceeded the set cooking temperature KK, both heaters 21 and 22 are turned off (step G7), and the process proceeds to step G11 to be described later. If not, the process returns to step G2.

If the above steps G2, G3, G5, and G6 are all "N", the closed loop of each of these steps is executed, that is, a time of 30 seconds is waited. When 30 seconds have elapsed, the process shifts to step G8 to determine whether or not the temperature detected by the rear temperature sensor 26 exceeds the temperature detected by the front temperature sensor 25. If the temperature detected by the rear temperature sensor 26 exceeds the temperature detected by the front temperature sensor 25, the process proceeds to step G9 to cut off the power of the rear heater 21, and if not, the process proceeds to step G10 and proceeds to the step G10. The heater 21 is energized.

By executing Step G8, Step G9 or Step G10 every 30 seconds, the temperature in the heating cooking chamber 4 is increased and the temperature of the front heater 21 and the rear heater 22 is increased. Also rises. If the detected temperature of the front temperature sensor 25 or the back temperature sensor 26 exceeds the heater reference temperature HK '(step G5), or if the detected temperature of the cooking temperature sensor 28 exceeds the set cooking temperature KK' (step G).
6), the control after step G11 is executed.

That is, in step G11, the temperature detected by the front temperature sensor 25 is changed to the heater reference temperature HK '.
Is determined to be greater than or equal to, and if so, step G
Then, the process proceeds to step G13, and if not, the process proceeds to step G13 to energize the front heater 21.

Next, the process proceeds to step G14, where it is determined whether or not the detected temperature of the back side temperature sensor 26 exceeds the heater reference temperature HK '.
And the process goes to step G16 to energize the rear heater 22 if the power is not exceeded.

Then, in step G17, it is determined whether or not the detected temperature of the cooking temperature sensor 28 has exceeded the set cooking temperature KK '. If it has, the process proceeds to step G18 to turn off both heaters 21 and 22. Then, the process returns to step G17 via step G19. That is, until the set cooking time has not elapsed, the process waits for the temperature in the heating cooking chamber 4 to drop. Thereafter, when the temperature in the cooking chamber 4 drops and becomes equal to or lower than the set cooking temperature KK ', the process shifts to step G20 to determine whether or not the set cooking time has elapsed. Then, both heaters 21 and 22 are turned off, and the process returns to the main routine. If not, the process returns to step G11. As described above, in grill cooking, the lower heater 29 is not energized, and the front heater 21 and the rear heater 22 are controlled so as to have substantially the same input.

In the main routine of FIG. 6, when toaster cooking is selected, the process proceeds to step S9. FIG. 9 shows the control in step S9.
First, in step Q1, the rear heater 22 and the lower heater 29 are energized. Next, in step Q2, it is determined whether the set cooking time has elapsed,
When the set cooking time has elapsed, the process proceeds to step Q3, where the back heater 22 and the lower heater 29 are turned off.

As can be seen from the above description, heater control during oven cooking, grill cooking and toaster cooking is basically performed as shown in FIG. That is, at the time of oven cooking, the front heater 21 is mainly used among the front heater 21 and the rear heater 22, and the rear heater 22 is controlled so as to have the same input as the front heater 21. The lower heater 29 is energized and de-energized in the opposite relationship to energization and de-energization of the back side heater 22.

In grill cooking, the front heater 21 of the front heater 21 and the rear heater 22 is mainly used, and the rear heater 22 is connected to the front heater 21.
However, the lower heater 29 is not used. Furthermore, in toaster cooking,
The lower heater 29 is used in addition to the rear heater 22 having a large heat generating capacity.

According to the present embodiment, the following effects can be obtained. That is, since the front heater 21 is provided on the ceiling 4b of the cooking chamber 4 and the rear heater 22 having a heating capacity larger than the heating capacity of the front heater 21 is provided, it is possible to perform oven cooking that does not require a large amount of heat. In, the heating power suitable for oven cooking can be obtained mainly by heating by the front heater 21, and the heating is mainly performed by the back heater 22 at the time of toaster cooking requiring a relatively large amount of heat. Thereby, a strong heating power suitable for toaster cooking can be obtained. As a result, the object to be heated can be cooked without overheating in the oven cooking, and a sufficient heating power can be obtained in the toaster cooking, so that the cooking time of the object to be heated can be shortened. Become like Moreover, since the back side heater 22 having a large heat generating capacity is provided on the back side of the cooking chamber 4,
The front side does not become excessively hot, which is convenient for putting in and taking out the food to be heated.

The front heater 21 is provided at a position forward of the center of the ceiling 4b.
Is provided on the ceiling 4b of the cooking chamber 4 at a position deeper than the center of the ceiling 4b, so that only a specific portion of the cooking chamber 4 is prevented from being intensively heated as much as possible. it can. That is, as shown in Japanese Patent Application Laid-Open No. 5-332561, in a configuration in which a plurality of heaters (bar-shaped heaters) are provided so as to be biased to the back side of the cooking chamber, the heat source is provided only at the back side of the cooking chamber. Since the heating cooking chamber is centrally heated, only the back side of the heating cooking chamber is locally heated. However, in the present embodiment, as described above, the heating heater and the front heater 21 are sandwiched by the center of the ceiling 4b of the heating cooking chamber 4. Since the rear heater 22 is provided separately, there is no such a problem.

Particularly, in this embodiment, the front heater 21
A front temperature sensor 25 is provided in the vicinity of the rear heater 22, a rear temperature sensor 26 is provided in the vicinity of the rear heater 22, and the front heater 21 and the rear heater 21 are provided in accordance with temperature detection results from the front temperature sensor 25 and the rear temperature sensor 26. Since the control of the side heater 22 is performed, it is also possible to make the amounts of heat generated by the front heater 21 and the rear heater 22 uniform.

In this case, when oven cooking or grill cooking is set, when the temperature detected by the rear temperature sensor 26 becomes higher than the temperature detected by the front temperature sensor 25, the input of the rear heater 22 is lowered and the rear temperature sensor is turned off. When the temperature detected by the temperature sensor 26 becomes lower than the temperature detected by the front temperature sensor 25, the input of the rear heater 22 is controlled to be increased. It can be changed in the same way as the temperature of the part, can contribute to uniform heating, and can perform good oven cooking and grill cooking.

In particular, at the time of oven cooking, the lower heater 29 is also energized in a timely manner, which can contribute to uniform heating of the entirety. Since the heater 29 is energized,
The three heaters 21, 22, 29 are not energized at the same time, that is, the rated current of ordinary households (usually 15
A current exceeding A) can be prevented from flowing, and a power breaker in a general household does not operate.

Further, according to this embodiment, the front heater 21
In addition, since the rear heater 22 is formed of a tube heater, radiant heat can be satisfactorily applied to the object to be heated, and a lower heater 29 is provided at the bottom of the cooking chamber 4 so that toaster cooking is set. Of the front heater 21 and the back heater 22, the back heater 22 is mainly heated, and the lower heater 29 is heated, so that the bread to be heated is heated in a short time and with good browning. Can cook.

Further, the optical sensor 13 serving as height detecting means,
Since the energization rate to the front heater 21 is changed according to the detection result by 14, the heating can be performed without excess or shortage according to the height of the food to be heated. Furthermore, according to the present embodiment, since the illumination lamp 27 is provided between the front heater 21 and the rear heater 22 and at a position near the front heater 21, the heating cooking chamber 4
It is convenient because the interior can be illuminated so that it is easy to see as a whole.

FIGS. 12 and 13 show a second embodiment of the present invention. In this second embodiment, the power cutoff control of each heater 21, 22, 29 during toaster cooking is performed by the first embodiment. Is different from the embodiment. That is, while the back heater 22 is always 100% energized, the lower heater 29 is turned off for a short period at a predetermined cycle, and the front heater 21 is energized during the cutoff period of the lower heater 29. I have. According to the second embodiment, it is possible to uniformly heat the cooked food (bread).

In the above-described first embodiment, the energizing condition of the lower heater 29 is the cutoff of the rear heater 22, but the energizing condition of the lower heater 29 is either the front heater 21 or the rear heater 22. May be energized when is turned off. Further, in the first embodiment, step P1 in FIG.
In the case of energizing the lower heater 29 in FIG. 8, 100% energization was performed as can be seen from Tables 1 and 2 above, but this was determined as an energization rate as shown in Tables 3 and 4 as the third embodiment of the present invention. Is also good. In this case, in the oven cooking, in addition to the input to the front heater 22 being changed according to the set cooking temperature KK, the input to the lower heater 29 is also changed. A rapid change can be prevented, good temperature control can be achieved, and it can further contribute to uniform heating.

[0065]

[Table 3]

[Table 4]

The present invention is not limited to the above embodiments. For example, when the front heater 21 is energized (when the temperature in the heating cooking chamber 4 is started) in step P4 in FIG. 7, the energization rate is set to 100% (continuous energization).
The duty ratio may be changed according to the cooking temperature setting.

[0067]

As apparent from the above description, the present invention has the following effects. According to the first aspect of the invention, the front heater is provided, and the back heater having a heating capacity larger than the heating capacity of the front heater is provided. By heating with the front heater, it is possible to obtain a heating power suitable for oven cooking, and at the time of toaster cooking that requires a relatively large amount of heat, heating is mainly performed by the back heater to achieve toaster cooking. It is possible to obtain a suitable strong heating power. As a result, the object to be heated can be cooked without overbaking during oven cooking, and the cooking time of the object to be heated can be reduced during toaster cooking. In addition, since a heater having a large heat generating capacity is provided on the back side of the cooking chamber, the front side of the cooking chamber does not become excessively hot, which is convenient for putting in and out the food to be heated. Further, the front heater is provided at a position forward of the center of the ceiling, and the back heater is provided at the ceiling of the cooking chamber at a position deeper than the center of the ceiling. Heating of only a specific portion can be prevented as much as possible.
Further, a front side temperature detecting means is provided near the front side heater,
A back side temperature detecting means is provided near the back side heater,
Temperature detection results from the temperature detection means and the back-side temperature detection means
Control of these front and back heaters depending on the
Control means for controlling these front heaters and
It is also possible to equalize the amount of heat generated by the
You.

[0068]

According to the second aspect of the present invention, since the front heater and the rear heater are constituted by tube heaters, radiant heat can be satisfactorily applied to the object to be heated, and the lower heater is provided at the bottom of the cooking chamber. Is arranged, and when the toaster cooking is set, the front heater and the rear heater mainly generate heat in the rear heater and the lower heater generates heat.
The bread to be cooked can be cooked in a short time and with good browning.

According to the third aspect of the present invention, when the oven cooking or the grill cooking is set, the control means controls the rear heater when the temperature detected by the rear temperature detecting means becomes higher than the temperature detected by the front temperature detecting means. When the temperature of the rear heater is lower than the temperature detected by the front temperature detector, the input of the rear heater is controlled to increase. The temperature can be changed in the same manner as the temperature of the heater portion, which can contribute to uniform heating.

According to the fourth invention, the duty ratio to the front heater is changed according to the detection result by the height detecting means.
Heating can be performed without excess or shortage according to the height of the food to be heated. No.
According to the fifth aspect of the present invention, since the illumination lamp is provided between the front heater and the rear heater and at a position near the front heater,
It is convenient because the whole cooking room can be illuminated so that it is easy to see.

According to the sixth aspect , the lower heater is provided at the bottom of the cooking chamber, and when the cooking temperature is set in the oven cooking, the input to the front heater is changed according to the set cooking temperature and the lower heater is changed. Since the means for changing the input to the heater is provided, a rapid change in temperature rise and fall can be prevented, good temperature control can be achieved, and uniform heating can be further contributed.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional side view showing a first embodiment of the present invention.

FIG. 2 is a perspective view

FIG. 3 is a cutaway side view of a machine room portion.

FIG. 4 is a vertical side view of a heater portion.

FIG. 5 is a block diagram of an electrical configuration.

FIG. 6 is a flowchart showing control contents.

FIG. 7 is a flowchart showing control contents.

FIG. 8 is a flowchart showing control contents.

FIG. 9 is a flowchart showing control contents.

FIG. 10 is a diagram showing a basic control mode of each heater.

FIG. 11 is a diagram showing a temperature change of each part and a control situation of each heater when the set cooking temperature is 150 ° C.

FIG. 12 is a flowchart of control contents showing a second embodiment of the present invention.

FIG. 13 is a diagram showing a basic control mode of a heater during toaster cooking.

[Explanation of symbols]

1 is a main body, 4 is a cooking chamber, 13 and 14 are optical sensors (height detecting means), 16 is a magnetron, 21 is a front heater, 22 is a rear heater, 25 is a front temperature sensor (front temperature detecting means), 26 is a back side temperature sensor (back side temperature detecting means), 28 is a cooking temperature sensor, 29 is a lower heater, and 30 is a control circuit (control means).

Claims (6)

(57) [Claims] 1. A main body having a cooking chamber for accommodating an object to be heated, a front heater provided on a ceiling of the cooking chamber at a position forward of a center of the ceiling, and the cooking chamber A rear heater located on the ceiling of the ceiling and located farther from the center of the ceiling and having a larger heating capacity than the front heater
And a front temperature detecting means provided near the front heater.
A step and a back temperature detection provided near the back heater
Means, the front temperature detection means and the back temperature detection means
The front heater and the back side according to the temperature detection result from
A heating cooker comprising: control means for controlling a heater . 2. A front heater and a back heater are tube heaters.
And a lower heater is provided at the bottom of the cooking chamber.
When the toaster cooking is set, the front heater and
When the back heater mainly generates heat,
The cooking device according to claim 1, wherein both the lower heaters generate heat . 3. The control means includes: oven cooking or grilling.
When cooking is set, the detection by the back side temperature detection
The output temperature becomes higher than the temperature detected by the front-side temperature detector.
Lower the input of the back side heater to the back side temperature detection means.
Temperature detected by the front-side temperature detection means
When it becomes, control to increase the input of the back side heater
The cooking device according to claim 1, wherein 4. A height detector for detecting the height of the object to be heated.
Means and the front side according to the detection result by the height detecting means.
Heating cooker according to claim 1, characterized in that a means for changing the duty ratio of the heater. 5. A heater between a front heater and a rear heater and
The heating cooker according to claim 1 , wherein an illumination lamp is provided at a position near the front heater . 6. A lower heater is provided at the bottom of the cooking chamber,
When cooking temperature is set in oven cooking,
When the input to the front heater is changed according to the set cooking temperature
2. The cooking device according to claim 1, further comprising means for changing an input to the lower heater .