JPH04341785A - Heat cooking appliance - Google Patents

Abstract

PURPOSE:To make a cooking appliance easy to use at cooking time, control the temperature of a heating object properly and precisely, provide high safety, and suppress the vain electric consumption. CONSTITUTION:An infrared-ray detecting means 15 to detect infrared-rays radiated from a heating object P and a rise output remembering means to remember the optimum rise conditions of the output from the infrared-ray detecting means 15 are installed. Also, an output comparing means to compare the output in the remembered optimum rise conditions with the output of the infrared-ray detecting means 15, a determining means to determine the rise output conditions of the infrared-ray detecting means 15 based on the comparison results, and a controlling means to control the infrared-ray radiation dose of a heating means 7 corresponding to the dermination results are provided.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device that uses a heating lamp such as a halogen lamp as a heating source and heats an object to be heated by infrared rays emitted from the heating lamp.

0003

2. Description of the Related Art In recent years, various cooking appliances have been proposed that use lamp heaters such as halogen lamps that emit infrared rays as a heating source. This type of heating cooker is provided with a heat-resistant top plate for placing an object to be heated above the halogen lamp. This top plate is made of a material that transmits infrared rays, such as tempered glass. Further, a reflecting plate for reflecting infrared rays is provided below the halogen lamp, and reflects the infrared rays emitted from the halogen lamp toward the object to be heated on the top plate.

[0004] Such heating cookers directly heat the object to be heated compared to those using gas or nichrome wire heaters as heat sources, and therefore have a feature of significantly higher energy utilization efficiency.

[0005] Furthermore, the conventional heating cooker has an energization control means for controlling the energization to the lamp heater, and the temperature of the object to be heated can be adjusted by manually operating this energization control means at the discretion of the cook. I try to adjust it.

However, since adjusting the temperature of the object to be heated largely relies on the cook's intuition, it has been difficult to appropriately adjust the temperature of the oil, especially when cooking tempura or the like. For this purpose, a temperature sensor is inserted into the oil to detect the temperature of the oil being heated, and the above-mentioned energization control means is controlled based on the signal from this temperature sensor to appropriately control the temperature. A method has been proposed that does this.

Recently, in order to adjust the temperature of the heated object, a temperature detection element such as a thermistor whose periphery is covered with a heat insulating material is installed under the top plate to indirectly detect the temperature of the heated object. It has been proposed that

[0008]

[Problems to be Solved by the Invention] In conventional heating cookers, the temperature of the oil can be accurately detected when the temperature sensor is properly inserted into the oil. If it is not inserted into the oil, the temperature of the oil will be controlled based on the inaccurate detected temperature. Additionally, if the temperature sensor is not properly inserted into the oil and the cook neglects to adjust the temperature or leaves the cooking device for a long time, the temperature of the oil may rise above the specified temperature. There may be cases where this happens. Furthermore, since the temperature sensor is placed in a high temperature state, it is connected to the main body via a cable and jack for safety and reliability, and the length of the cable is kept as short as possible. Therefore, there was a problem that the usability during cooking became very poor.

[0009] Furthermore, a temperature detection element such as a thermistor whose periphery is covered with a heat insulating material is provided below the top plate to detect the temperature of the object to be heated, such as oil, placed on the top plate. The top plate itself has a very large heat capacity, and the inside of the refrigerator where the lamp heater is located gets very hot, so it is difficult to quickly and accurately detect the slight temperature change when tempura, etc. is placed. A problem will arise in the finished product. Furthermore, with such a temperature detection element, it is difficult to detect the presence or absence of an object to be heated on the top plate in a short time, so even if there is no object to be heated on the top plate, the cook may start energizing due to residual heat etc. If the appliance is left unattended for a long period of time, there is a risk that the inside of the refrigerator and the surface of the top plate will become extremely hot, and this will also lead to unnecessary power consumption.

[0010] The present invention has been made in view of the above, and is very easy to use during cooking, can quickly and appropriately control the temperature of the heated object, and can control the temperature of the heated object on the mounting table. It is an object of the present invention to provide a heating cooker that can quickly detect the presence or absence of food in a non-contact state, has high safety, and does not consume unnecessary power.

[Configuration of the invention]

0012

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention first provides an infrared transmitting and heat resistant mounting table on which an object to be heated is placed, and a rear side of the mounting table. heating means for emitting infrared rays to heat the object to be heated; infrared detecting means for detecting infrared rays emitted from the object; and a riser for storing an optimum rise state of the output from the infrared detecting means. output storage means; output comparison means for comparing the output of the infrared detection means with the output of the optimum rising state stored in the rise output storage means; The gist of the present invention is to include a determining means for determining a rising output state, and a control means for controlling the amount of infrared radiation of the heating means in accordance with the determination result by the determining means.

[0013] Secondly, a mounting table having infrared transmittance and heat resistance and on which an object to be heated is placed, and a heating means provided on the back side of the mounting table and emitting infrared rays to heat the object to be heated. , an infrared detection means for detecting infrared rays emitted from the object to be heated and, when the object to be heated is not placed on the mounting table, detecting infrared rays emitted from the heating means that passes through the mounting table; and a determining means for determining the placement state of the object to be heated on the mounting table based on the output from the infrared detecting means, and a heating means according to the determination result by the determining means and the output of the infrared detecting means. The gist of the invention is to have a control means for controlling the amount of infrared radiation.

[0014]

[Function] In the above structure, firstly, the object to be heated is heated by irradiating the object with infrared rays emitted from the heating means. The infrared rays emitted from the heated object are detected by the infrared detection means, and the heating temperature of the object can be detected quickly and accurately based on its output. On the other hand, the optimum rise state of the output from the infrared detection means is stored in advance in the rise output storage means. Then, the output comparing means compares the stored output of the optimum rising state with the detection output of the infrared detecting means, and the determining means discriminates the rising output state of the infrared detecting means based on the comparison result. That is, as shown in FIG. 8, for example, depending on how the detection output from the infrared detection means rises after a certain period of time T0 has elapsed from the start of heating, it can be determined whether the infrared detection means is operating normally or not, and whether the object to be heated is It is determined whether the type of pot, amount of oil, etc. are appropriate. Specifically, as shown in A in FIG. 8, if the detection output after a certain period of time T0 is an appropriate output, it is determined that the infrared detection means is operating normally and the object to be heated is also appropriate. Ru. At this time, the amount of infrared radiation from the heating means is appropriately and precisely controlled by the control means based on the output from the infrared detection means. In addition, if the rising speed of the detection output is slow as shown in B in Figure 8, or if the detection output does not rise as shown in D in the figure, or if the detection output increases significantly as shown in C in the figure, It is determined that the infrared detection means is not operating normally or that the state of the object to be heated is not appropriate. In this way, when it is determined that the infrared detection means is not operating normally or that the state of the object to be heated is not appropriate, the amount of electricity supplied to the heating means is kept low by the control of the control means, and the amount of infrared radiation is reduced. The safety of the heating cooker is ensured.

Second, when there is an object to be heated on the mounting table, the infrared detecting means detects infrared rays emitted from the object with a field of view formed on the side surface of the object. Further, when there is no object to be heated on the mounting table, the field of view is formed so as to detect the infrared rays emitted from the heating means that pass through the mounting table, and the infrared rays emitted from the heating means are detected. The determining means determines whether the object to be heated is on the mounting table or not, depending on how the detection output from the infrared detecting means rises when a certain time T0 has elapsed from the start of heating, as shown in FIG. 12, for example. . Specifically, as shown in A in the figure, if the detection output after a certain period of time T0 has passed is an appropriate output, it is determined that the object to be heated is on the mounting table. Further, when the detection output increases significantly as shown in B in the figure, it is determined that the object to be heated is not on the mounting table. When there is an object to be heated on the mounting table, the amount of infrared radiation from the heating means is appropriately and accurately controlled by the control means based on the output from the infrared detecting means. When there is no object to be heated on the mounting table, the control means controls the amount of electricity supplied to the heating means to limit the amount of heat generated, or the electricity is stopped to ensure the safety of the cooking device. At the same time, unnecessary power consumption can be suppressed.

[0016]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 8 are diagrams showing a first embodiment of the present invention.

First, the configuration of the heating cooker will be briefly explained using FIGS. 1 and 2.

FIG. 1 is a perspective view of the cooking device, and FIG. 2 is a sectional view showing a state in which an object to be heated is placed on the cooking device and infrared rays from the object are detected by an infrared detector. . In these figures, the heating cooker 1 has a top plate 5 as a mounting table disposed on a casing 3 with an open top surface. An infrared detector 15 as an infrared detection means, which will be described later, is provided at a corner of the top plate 5. Further, the top plate 5 is provided with placement portions 6a, 6b, and 6c for placing the object to be heated P at appropriate positions. Three heating devices 7 as heating means are provided below the placing portions 6a, 6b, and 6c. Four halogen lamps 9 are incorporated in the heating device 7 of the mounting portions 6a and 6b. Further, a nichrome heater is incorporated in the heating device 7 of the mounting portion 6c. The halogen lamp 9 emits appropriate infrared rays such as near infrared rays, middle infrared rays, and far infrared rays. Further, the operation unit 11 is provided with various switches related to cooking and display lamps such as LEDs for displaying the heating state.

The top plate 5 is made of a material that easily transmits infrared rays emitted by the halogen lamp 9, such as heat-resistant glass such as crystallized glass, and has an object to be heated, such as a frying pan P, on its upper surface. is placed.

The infrared detector 15 is housed in the infrared detector housing 13 provided in the corner of the housing 3 when the cooking device 1 is not cooking tempura or the like. When cooking tempura or the like, the infrared detector 15 is projected from the storage section 13 to the upper part of the top plate 5 by a movable device 66, which will be described later.
A field of view 17 is formed on a part of the side surface of the pot P by the optical element 16, and infrared rays from the object to be heated are incident on the light receiving part of the infrared detection element 14.

Next, the main parts of the operating section 11 will be explained using FIG. 3.

In the figure, an operation switch 29 is an operation switch for setting the temperature of the oil in the pot P to an appropriate temperature when cooking tempura or the like. The on switch 31 is a switch that enables the halogen lamp 9 to be energized. Further, the cut-off switch 33 is used to turn off the halogen lamp 9. The input down switch 35 is a switch for decreasing the current flowing to the halogen lamp 9, and the input up switch 37 is a switch for increasing the current flowing to the halogen lamp 9. The display section 39 shows the heating power of the halogen lamp 9 from 1 to 8.
It is made up of eight LEDs with level indications up to. Therefore, the display section 39 displays the amount of current being applied to the halogen lamp 9, that is, the amount of heat emitted by the halogen lamp 9 in eight levels from level 1 to level 8. For example, the LED corresponding to level 1 among the 8 LEDs
When D39a lights up, it indicates that the heating power is weak. Further, when the LED 39d corresponding to level 4 lights up, it indicates that the heating power is medium. Similarly, when the LED 39h corresponding to level 8 lights up, it indicates that the heating power is strong. 30 is an indicator light for warning display.

FIG. 4 is a circuit diagram showing a control circuit connected to the operating section 11 and its peripheral devices. The area where this control circuit is installed is separated from the area where the heating device 7 is housed by a heat insulating material.

Four halogen lamps 9 connected in parallel to each other are connected to the AC power source 41, and a triac 47 is connected to the four halogen lamps 9. Further, the AC power supply 41 is connected to each of a constant voltage circuit 51 and an initialization circuit 53. This constant voltage circuit 51
converts the alternating current voltage from the alternating current power supply 41 into a constant value direct current voltage and outputs it. Further, the initialization circuit 53 generates an initialization signal for performing initial settings. The drive circuit 55 is a circuit for applying a gate signal to the gate terminal 47g of the triac 47 at a timing corresponding to the drive signal inputted from the microcomputer 57.

The microcomputer 57 uses the DC voltage from the constant voltage circuit 51 as a power source, and receives an initialization signal from the initialization circuit 53 to be initialized and set to an operable state. Further, the microcomputer 57 inputs the detection signal from the infrared detector 15 via the A/D conversion circuit 59. The microcomputer 57 has energization control means for controlling the energization of the halogen lamp 9 by controlling the drive circuit 55 in response to the detection signal from the infrared detector 15 when the aforementioned operation switch 29 is operated. ing.

FIG. 5 shows in blocks the functions of the microcomputer 57 for controlling the operation of the infrared detector 15 and the heating device 7 as a heating means based on the detection output of the infrared detector 15. The infrared detector 15 is projected from inside the storage part 13 to the upper part of the top plate 5 by a movable means 66, and the infrared rays from the object to be heated are incident on the infrared detection element 14 by the optical element 16, and the temperature of the object to be heated and the room temperature are detected. outputs an infrared detection signal according to the difference between the The output signal from the infrared detection element 14 is sent to the sensor amplification section 70.
The signal is amplified by and input to the addition output section 73. On the other hand, the infrared detection element 1 includes a diode 71 and a room temperature compensator 72 provided inside or near the infrared detection device 14.
Since the room temperature compensation signal No. 4 is also input to the addition output section 73,
The infrared detector 15 outputs a detection signal according to the amount of infrared rays from the object to be heated, regardless of the room temperature. Here, as the element for room temperature compensation, a temperature detection element such as a thermistor may be used instead of a diode. The detection signal from the infrared detector 15 is compared by the output comparison means 62 with the stored contents of the output storage means 61 which stores the optimum rising state, and the means determines the rising output state of the infrared detector 15 based on the comparison result. 63, and the amount of heat generated by the heating means 7 is controlled by the control means 64 according to the result of this determination.

Next, the operation will be explained with reference to the control flowcharts of FIGS. 6 and 7 and FIG. 8. When the AC power supply 41 is turned on in step S1, the process proceeds to step S3, and the microcomputer 57 is set to an operable state by an initialization signal from the initialization circuit 53. In step S5, the tempura operation switch 29
It is determined whether or not the operation switch 29 has been turned on, and if the operation switch 29 has not been turned on, the process advances to step S7 and normal control is executed. If the tempura operation switch 29 is turned on in step S5, the process advances to step S9 and the detection signal from the infrared detector 15 is read.

Steps S11, S13, S15 and S1
7, the drive circuit 55 is controlled according to the detection signal from the infrared detector 15. Specifically, the temperature of the oil in the pan P is 50°C based on the detection signal from the infrared detector 15.
℃ or less, the process proceeds to step S13, and the drive circuit 55 increases the amount of current supplied to the halogen lamp 9.
control. Further, when the oil temperature is within the range of 50° C. to 100° C., the drive circuit 55 is controlled so that the amount of current applied to the halogen lamp 9 is a medium value. Furthermore, if the temperature of the oil is 100°C or higher, step S17
Then, the drive circuit 55 is controlled so that the amount of current applied to the halogen lamp 9 becomes a low value. As described above, one of the three heating power levels "strong", "medium", and "weak" is set depending on the temperature of the oil, and heating control is executed toward the heating target temperature of 180°C.

Next, in step S19, a certain period of time T0,
For example, it waits for one minute. Next, step S21
Then, the detected temperature based on the detection signal from the infrared detector 15 after a certain period of time T0 has elapsed is read. Next step S
In 23, the gradient of the temperature increase is calculated based on the detected temperature read in step S11 and the detected temperature after one minute has elapsed, and it is determined whether this gradient is appropriate. As shown in A in FIG. 8, if the gradient of the oil temperature rise is appropriate, the process advances to step S25 and the heating operation is continued until the oil temperature rises to 180°C. When the temperature of the oil reaches 180°C due to such heating operation, step S27
Proceed to and control the oil temperature to maintain it at 180°C.

Next, in step S23, if the gradient of the temperature rise of the oil is not appropriate, the process advances to step S29. In step S29, various control processes are executed depending on the gradient of the oil temperature rise. Specifically, as shown in D in FIG. 8, when the detected temperature of the oil hardly changes, the process advances to step S31, and the infrared detector 15 is out of order, or the infrared detector 15 and the pot P are not connected. The infrared detector 15 determines that there is a shielding object between them and detects the infrared rays from the shielding object. Subsequently, in step S33, the drive circuit 55 is instructed to stop energizing the halogen lamp 9 and stop the heating operation. Next, in step S35, the indicator light 30 is turned on to generate a warning.

Next, as shown in C in FIG. 8, if the gradient of the temperature rise of the oil is steep, the process proceeds to step S37, and it is determined that the amount of oil in the pan P is too small. Next, the process proceeds to step S39, where the energization to the halogen lamp 9 is stopped to stop the heating operation, and the process proceeds to step S41, where the indicator lamp 30 is turned on to issue a warning.

Next, as shown in B in FIG. 8, if the gradient of the temperature rise of the oil is gentle, the process advances from step S29 to step S43. In step S43, if the type of pan P is not appropriate, for example, the material of the pan P may be aluminum or stainless steel, which has a low emissivity to heat the oil.
It is determined that the optical element 16 for forming the field of view 17 of the infrared detector 15 is dirty or that the amount of oil is excessive. In such a case, the process proceeds to step S45, and the drive circuit 55 is controlled to set the amount of current supplied to the halogen lamp 9 to the minimum value, thereby setting the heating power to the minimum value. Subsequently, in step S47, the detection signal from the infrared detector 15 is read after a certain period of time has elapsed, and the detected temperature at this time is recorded in the output storage means 61. Next step S49
In this case, it is determined whether the above-described determination process, that is, the determination process when the gradient of the oil temperature rise is gentle, is the second time, and if it is the first time, the process returns from step S49 to step S19, as described above. Continue control processing. If it is determined in step S49 that the above-described control process is being performed for the second time, the process advances to step S51 to stop energizing the halogen lamp 9 and stop the heating operation. Further step S
At step 53, the indicator light 30 is turned on to generate a warning.

FIG. 9 shows means for preventing contamination of the optical element 16 for forming the field of view 17 of the infrared detector 15.

FIG. 9(A) shows that when the infrared detector 15 is projected onto the top plate 5 by the movable means 66, the storage portion 1
A brush 75 provided on a part of the optical element 16 comes into contact with the outer surface of the optical element 16 to remove dirt and the like adhering to the surface of the optical element 16.

Similarly, FIG. 9(B) shows that when the infrared detector 15 is projected onto the top plate 5 by the movable means 66, air is sent out along the outer surface of the optical element 16 by the air blower 76, and the optical element 16 is It is designed to remove dirt, etc. that has adhered to the surface.

As described above, the heating cooker of this embodiment has the following features:
Since the infrared detector can detect the temperature of the object to be heated P in a non-contact manner during tempura cooking, it is possible to easily and safely cook tempura.

FIGS. 10 to 12 show a second embodiment of the present invention.

In this embodiment, when cooking tempura or the like, as shown in FIG. A field of view 17 is formed on a part of the side surface of the pot P by the optical element 16, and infrared rays from the object to be heated are incident on the light receiving part of the infrared detection element 14. On the other hand, when the pot P is not placed on the placement part 6a of the top plate 5,
Since the field of view 17 covers part or all of the mounting portion 6a of the top plate 5, infrared rays emitted from the halogen lamp 9 are made to enter the light receiving portion of the infrared detection element 14.

The configuration of the operating section and the control circuit connected to the operating section is substantially the same as that of the first embodiment.

Next, the operation will be explained with reference to the control flowchart of FIG. 11 and FIG. 12.

After the microcomputer is set to an operable state by the initialization signal in step S63, it is determined in step S65 whether or not the on switch 31 has been turned on. Proceeding to step S67, the temperature of the heated object based on the detection signal from the infrared detector 25 is read.

Steps S69, S71, S73 and S7
5, the drive circuit 55 is controlled according to the detection signal from the infrared detector 15. Specifically, the temperature of the heated object is 50°C based on the detection signal from the infrared detector 25.
If it is below, the process proceeds to step S71 and the drive circuit 55 is controlled to increase the amount of current supplied to the halogen lamp 9. Further, when the temperature of the object to be heated is within the range of 50° C. to 100° C., the drive circuit 55 is controlled so that the amount of current applied to the halogen lamp 9 is a medium value. Furthermore, if the temperature of the object to be heated, such as when cooking tempura, is 100°C or higher, the process advances to step S75 and the halogen lamp 9
The drive circuit 55 is controlled so that the amount of current applied to the drive circuit 55 becomes a low value. As mentioned above, there are 3 levels of heating power: "strong", "medium",
The heating power is set to one of "weak" depending on the temperature of the object to be heated, and heating control is executed.

Next, in step S77, a certain period of time T0
, for example, for one minute. Then step S7
At step 9, the detected temperature based on the detection signal from the infrared detector 25 after a certain period of time T0 has elapsed is read. Next, in step S81, the detected temperature read in step S69 and 1
The gradient of the temperature increase is calculated based on the detected temperature after a lapse of minutes, and it is determined whether this gradient is appropriate. As shown in A in FIG. 12, if the gradient of the temperature increase of the object to be heated is appropriate, the process proceeds to step S83, and it is determined that the object to be heated, such as a pot, is present on the mounting portion 6a on the top plate 5, The process advances to step S85 and the normal heating operation is continued.

Next, in step S81, if the gradient of the temperature rise of the object to be heated is not appropriate, the process advances to step S87. In step S87, various control processes are executed depending on the gradient of the temperature increase of the object to be heated. To explain specifically,
If the detected temperature of the heated object hardly changes as shown in C in FIG. It is determined that there is a shielding object between the two and the infrared detector 25 is detecting infrared rays from the shielding object. Subsequently, in step S91, the drive circuit 55 is instructed to stop energizing the halogen lamp 9 and stop the heating operation. Next, in step S93, the indicator light 30 is turned on to generate a warning.

Next, as shown in B in FIG. 12, if the gradient of the temperature increase of the object to be heated is steep, the process proceeds to step S95, and the object to be heated, such as the pot P, is placed on the mounting portion 6 on the top plate 5.
It is determined that there is no food in the pot P, or that the amount of the material to be heated such as water or oil in the pot P is too small, resulting in an empty cooking state. Next, the process proceeds to step S97, where the energization to the halogen lamp 9 is stopped to stop the heating operation, and the process proceeds to step S99, where the indicator lamp 30 is turned on to issue a warning.

As described above, according to this embodiment, the field of view is formed such that the infrared detector 25 detects infrared rays from the halogen lamp 9 when there is no object to be heated such as the pot P on the top plate 5. Accordingly, the presence or absence of an object to be heated such as the pot P can be quickly detected, and safe and economical cooking can be performed.

[0048]

[Effects of the Invention] As explained above, according to the present invention,
First, since the temperature of the object to be heated is detected without contact using the infrared detection means, the temperature of the object to be heated can be detected quickly and accurately, and the usability during cooking can be significantly improved. can. In addition, the optimum rising state of the output from the infrared detecting means is stored in advance, and this is compared with the output of the infrared detecting means, and the rising output state of the infrared detecting means is determined based on the comparison result. Since the amount of infrared radiation of the heating means is controlled accordingly, it is possible to control the amount of infrared radiation of the heating means depending on the results of judgments such as whether the infrared detection means is operating normally and whether the objects to be heated, such as the pot and the amount of oil, are appropriate. can perform control processing,
The temperature of the object to be heated can be appropriately and accurately controlled with high safety.

Second, since the presence or absence of the object to be heated on the mounting table is determined and control processing is performed according to the result of this determination, a cooking device that is safer and consumes less power can be created. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of a heating cooker according to the present invention.

FIG. 2 is a longitudinal sectional view of the first embodiment.

FIG. 3 is a front view of the operating section in the first embodiment.

FIG. 4 is a block diagram showing a control circuit, etc. in the first embodiment.

FIG. 5 is a block diagram showing functional blocks, etc. within the microcomputer in the first embodiment.

FIG. 6 is a control flowchart for explaining the operation of the first embodiment.

FIG. 7 is a control flowchart for explaining the operation of the first embodiment.

FIG. 8 is a diagram showing a detection signal of an infrared detector with respect to heating time in the first embodiment.

FIG. 9 is a diagram showing a modification of the infrared detector portion in the first embodiment.

FIG. 10 is a longitudinal sectional view of a second embodiment of the invention.

FIG. 11 is a control flowchart for explaining the operation of the second embodiment.

FIG. 12 is a diagram showing a detection signal of an infrared detector with respect to heating time in the second example.

[Explanation of symbols]

5 Top plate (mounting table) 7 Heating device (heating means) 15, 25 Infrared detector (infrared detection means) 61
Rise output storage means 62 Output comparison means 63 Discrimination means 64 Control means P Pot (object to be heated)

Claims (2)

[Claims] 1. A mounting table having infrared transmittance and heat resistance on which an object to be heated is placed, a heating means provided on the back side of the mounting table and emitting infrared rays for heating the object to be heated, An infrared detecting means for detecting infrared rays emitted from an object to be heated, a rising output storing means for storing an optimum rising state of the output from the infrared detecting means, and an output of the optimum rising state stored in the rising output storing means. and an output of the infrared detection means; a determination means for determining a rising output state of the infrared detection means based on a comparison result of the output comparison means; A heating cooker comprising: a control means for controlling the amount of infrared radiation of the heating means. 2. A mounting table having infrared transmittance and heat resistance on which an object to be heated is placed, a heating means provided on the back side of the mounting table and emitting infrared rays for heating the object to be heated, an infrared detection means for detecting infrared rays emitted from an object to be heated, and detecting infrared rays emitted from the heating means that transmits through the mounting table when the object to be heated is not placed on the mounting table; a determining means for determining the placement state of the object to be heated on the mounting table based on the output from the infrared detecting means; A heating cooker characterized by having a control means for controlling the amount of radiation.