WO2019044413A1

WO2019044413A1 - Heat cooking apparatus

Info

Publication number: WO2019044413A1
Application number: PCT/JP2018/029504
Authority: WO
Inventors: 今井　博久; 巌徹松井; 直哉谷口
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2017-08-30
Filing date: 2018-08-07
Publication date: 2019-03-07
Also published as: JPWO2019044413A1; JP7113211B2

Abstract

This heat cooking apparatus is provided with: a heating chamber (13) in which a to-be-heated object is accommodated; a heating unit that heats the to-be-heated object accommodated in the heating chamber (13); and a photographing unit that photographs the inside of the heating chamber (13). The heat cooking apparatus is further provided with a reading unit (21) for reading heating control information that is given to the to-be-heated object and that includes a first heating power and a first heating time period at the first heating power. Further, the heat cooking apparatus is provided with: a power conversion unit (31) that, on the basis of the heating control information read by the reading unit (21), converts the first heating time period to a second heating time period at a second heating power different from the first heating power of the heating control information; and a switching unit (32) that switches whether or not conversion by the power conversion unit (31) is to be performed.

Description

Cooker

The present disclosure relates to a heating cooker for heating food.

A microwave oven, which is a typical cooking device, has the convenience of being able to heat food in a container without using a pot and pan. In some cases, a store clerk may use a microwave oven to heat and provide purchased food at a store that sells packed lunches and general dishes in containers.

Such a service will be described. In general, containers such as lunch boxes and side dishes display a heating time that is optimum for heating in a microwave oven. And the store clerk of the store sees the display, sets the heating time with the microwave, and heats the food. The operation unit of the microwave oven is provided with numeric keys and the like, and the heating time (minutes and seconds) is manually set.

In addition, the microwave oven may have a plurality of operation buttons, and each operation button may be assigned a different heating time. In this case, the store clerk in the store selects a button corresponding to the food to be heated. Thereby, food etc. can be heated by heating control suitable for the food, and food can be provided to a customer.

When the heating time (minutes, seconds) is set by using the number keys as in the former configuration, the number of operations is large, which may result in troublesome operations. In the latter configuration, that is, when different heating times are assigned to each of the plurality of operation buttons, the store clerk learns the correspondence between the buttons and the heating time as the type of food increases. It can be difficult.

The following methods have been proposed to eliminate these inconveniences and mistakes. The microwave oven stores the heating control content in advance for each product, and the store clerk at the store uses the barcode reader to read the information (code information) of the barcode attached to the product. And a microwave oven calls the heating control content of the goods corresponding to the code information, and performs appropriate heating.

Furthermore, instead of using a barcode reader, a microwave oven is equipped with a camera for imaging the inside of the refrigerator, and the microwave oven extracts the barcode portion from the image of the product inserted into the refrigerator, and the barcode is displayed Reading is also proposed. Thereby, the heating control content corresponding to the product can be called from the code information, and appropriate heating can be performed. According to this, it becomes possible to reduce the burden of the operation of the store clerk and to perform an error-free heating service (for example, Patent Document 1).

JP 2001-349546 A

According to the present disclosure, according to each of a plurality of models, the heating time can be automatically set without the store clerk inputting the heating time of the product or selecting the button corresponding to the product. The present invention provides a cooker capable of heating with an appropriate output.

The heating cooker according to the present disclosure is provided to a heating chamber for storing the object to be heated, a heating unit for heating the object to be heated stored in the heating chamber, a photographing unit for photographing the inside of the heating chamber, and the object to be heated. And a reading unit that reads heating control information including the first heating power and the first heating time of the first heating power. Further, the heating cooker performs a second heating time at a second heating power different from the first heating power of the heating control information based on the heating control information read by the reading unit. And a switching unit for switching whether or not the conversion of the power conversion unit is to be performed.

According to the present disclosure, when the object to be heated is placed in the heating chamber of the heating cooker, the heating power applied to the object from the image in the heating chamber taken by the imaging unit The reading unit reads the heating control information including the heating time of the heating power. Then, the power conversion unit calculates the heating time with different heating power based on the heating control information, and switches whether or not the switching unit performs conversion of the power conversion unit. Then, the heating control unit controls the heating unit to heat the object based on the result of the switching unit.

Thereby, according to the heating power of a heating cooker, without using a useless energy, appropriate heating power and heating time can be set up automatically, and a to-be-heated material can be heated.

Drawing 1 is an appearance perspective view of a microwave oven which is an example of a cooking-by-heating machine of a 1st embodiment of this indication. FIG. 2 is a schematic block diagram of the microwave oven. FIG. 3: is a figure which shows an example of the goods information containing heating control information provided to the goods heated with the same microwave oven. FIG. 4 is a characteristic diagram showing the relationship between the water content of the food to be heated and the saturated heating power in the same microwave oven. FIG. 5: is a figure which shows the relationship between the water content of the foodstuff which is a to-be-heated material in the same microwave oven, and upper limit power. FIG. 6 is a characteristic diagram showing the relationship between the water content of the food which is the object to be heated and the heating time in the same microwave oven. FIG. 7: is a figure which shows the water content of the foodstuff which is a to-be-heated material in the same microwave oven, and the relationship of heating time. FIG. 8 is a flowchart showing the flow of the operation of the microwave oven. FIG. 9 is a diagram illustrating an example of product information including heating control information provided to a product to be heated by a microwave according to the second embodiment of the present disclosure. FIG. 10 is a schematic configuration diagram of the microwave oven. FIG. 11 is a flowchart showing the flow of the operation of the microwave oven. FIG. 12 is a schematic configuration diagram of a main part of a microwave oven according to a third embodiment of the present disclosure. FIG. 13 is a flowchart showing the flow of the operation of the microwave oven.

(Findings underlying the present disclosure)
The microwave oven has different maximum output power depending on the model. Therefore, in the prior art, in order to heat the product in the microwave oven in the shortest time by the maximum output power, the following operations are required. That is, it is necessary to register the correspondence relationship between the product derived from the read barcode and the heating time with different contents for each model of the microwave oven. The registration work of this correspondence is a troublesome work that can also cause a registration error. In view of such problems, the present disclosure has been made.

(An example of the aspect of this indication)
A first aspect of the present disclosure is a heating cooker, which includes a heating chamber for storing an object to be heated, a heating unit for heating the object to be heated stored in the heating chamber, and photographing of the inside of the heating chamber It has a department. Moreover, the heating cooker is read by the reading unit that reads the heating control information including the first heating power and the first heating time at the first heating power applied to the object to be heated. And a power conversion unit configured to convert a first heating time into a second heating time at a second heating power different from the first heating power of the heating control information based on the heating control information. Moreover, a heating cooker is provided with the switch part which switches whether the conversion of a power conversion part is performed.

Thereby, when the to-be-heated material to be heated is put in the heating chamber of the heating cooker, from the image in the heating chamber photographed by the imaging unit, the heating power applied to the object and the heating thereof The reading unit reads the heating control information including the heating time in the power. The power conversion unit calculates the heating time with different heating power based on the heating control information, and the switching unit switches whether to convert the power conversion unit. Then, the heating control unit controls the heating unit to heat the object based on the result of the switching unit.

Thereby, according to the heating power of a heating cooker, an appropriate heating power and heating time which do not use waste energy can be set up automatically, and a to-be-heated material can be heated.

According to a second aspect of the present disclosure, the switching unit further determines whether to perform conversion of the power conversion unit based on the heating control information read by the reading unit.

Thus, based on the heating control information including the heating power and the heating time for the heating power applied to the object to be heated read by the reading unit, whether or not the switching unit performs conversion by the power conversion unit judge. Therefore, according to the heating power of the heating cooker, it is possible to automatically set the appropriate heating power and heating time without using unnecessary energy, and to heat the object to be heated.

In the third aspect, whether the reading unit has a mark reading unit that reads a predetermined specific mark, and the switching unit performs conversion of the power conversion unit based on the result read by the mark reading unit It is determined whether or not.

As a result, whether or not the power conversion by the power conversion unit is to be performed is performed based on the result of the reading unit reading a predetermined specific mark. This makes it possible to switch whether to perform power conversion depending on whether the food is to be marked. Therefore, the heating power and the heating time can be automatically set according to the heating power of the heating cooker without using unnecessary energy, and the object to be heated can be heated.

A 4th aspect is further provided with the detection part which detects the heating load of the to-be-heated material accommodated in the heating chamber, and the switching part converts the power conversion part based on the heating load detected by the detection part. It is determined whether or not.

Thus, the detection unit detects the heating load of the object to be heated, and the switching unit determines whether the conversion of the power conversion unit is to be performed based on the detected heating load. Therefore, according to the heating power of the heating cooker, it is possible to automatically set the appropriate heating power and heating time without using unnecessary energy, and to heat the object to be heated.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the present disclosure is not limited by these embodiments.

First Embodiment
Drawing 1 is an appearance perspective view of microwave oven 1 which is an example of a cooking-by-heating machine concerning a 1st embodiment of this indication.

As shown in FIG. 1, the microwave oven 1 includes a housing 2 for storing food, and a door 3 provided in the housing 2 for loading and unloading food. The door 3 is provided with a transparent glass window 4 for making the inside of the housing 2 visible from the outside, a handle 5 gripped when opening and closing the door 3, and an operation display unit 6.

The operation display unit 6 includes a liquid crystal display 7, a power switching display 8, a time setting button group 9, a heating start button 10, a cancel button 11, and a pause button 12.

As described later, the microwave oven 1 shoots a product which is a heating target (object to be heated) by the photographing unit (camera 17), and reads the heating power and the heating time displayed on the product. Then, the microwave oven 1 switches whether to calculate the heating time corresponding to the different heating power calculated by the power conversion instead of the read heating power and the heating time, and when performing the calculation, the different heating is performed The product is heated in the heating time calculated by the power.

The liquid crystal display 7 displays the read heating time or the calculated heating time calculated by performing the power conversion operation on the read heating time.

The power switching indicator 8 is a display for indicating whether or not the power conversion has been performed. The power switching indicator 8 is, for example, an LED, and is turned on when the power is converted and turned off when the power is not converted.

The microwave oven 1 is provided with a time setting button group 9 in the case where the heating time can not be read well, or in the case of heating a product for which the heating time is not displayed. The user can set the heating time using the number buttons and the "minutes" and "seconds" buttons. In this case, the set heating time is displayed on the liquid crystal display 7.

The heating start button 10 is a button that is pressed when the user starts heating.

The cancel button 11 is a button that is pressed when the user presses the heating start button 10 to start heating and then stops heating in the middle of heating.

The pause button 12 is a button that is pressed when the user temporarily stops heating during heating. In addition, when the heating is temporarily stopped, the user presses the heating start button 10 again, and the remaining heating is performed halfway.

FIG. 2 is a schematic configuration diagram of the microwave oven 1 according to the present embodiment.

The microwave oven 1 is capable of heating food or the like by high frequency, and a magnetron 14 which is a heating unit for outputting high frequency is provided in a heating chamber 13 for storing objects to be heated such as food. The high frequency is supplied to the heating chamber 13 by the magnetron 14 to heat the food. The magnetron 14 is controlled by the heating control unit 15.

The microwave oven 1 is provided with the illumination 16 and the camera 17 which is a photographing unit on the same side as the illumination 16 is provided.

The camera 17 captures an image in the heating chamber 13. Since the camera 17 is disposed on the same side as the illumination 16, the inside of the heating storage 13 is photographed without being backlit.

The housing 2 is provided with a door switch 18 for detecting the opening and closing of the door 3. The door 3 is provided with a projection 19 for pushing the door switch 18. In addition, the structure of opening / closing detection of these doors 3 is an example, and another structure can also be used.

In the heating chamber 13, goods (food to be heated) such as a lunch box, a rice ball, and a side dish are placed. On each of these products, a seal 20 (see FIG. 3), which is a pasted product, on which heating power and heating time are displayed as heating control information of the product is attached.

This seal 20 has a heating time for heating with a heating power of 500 W, for example, as a standard when heating with a general household microwave oven, and a large heating power for a short time with a microwave oven for business use. As a standard for heating, for example, a heating time in the case of heating with a heating power of 1500 W is also described.

Specifically, for example, "500 W 2 minutes 00 seconds 1500 W 0 minutes 40 seconds" or the like is displayed on the seal 20 (see FIG. 3).

More specifically, the heating control information is a first character string representing a heating amount at a predetermined heating power, for example "500", and a second character string representing a unit of the heating power, for example "W" And a third character string which is a number which is the heating time at the heating power, eg "2", and a fourth character string representing the unit of the heating time, eg "minute" and the heating at the heating power It is a character string including, in this order, a fifth character string indicating a time, for example, "00", and a sixth character string indicating a unit of heating time, for example, "seconds".

Further, the heating control information is a seventh character string representing the heating amount of the heating power larger than the predetermined heating power described above, for example "1500" and an eighth character string representing the unit of the heating power, for example "W" and the ninth character string which is a number which is the heating time at the heating power, eg "0", and the tenth character string representing the unit of the heating time, eg "minute" and the heating power An eleventh character string indicating a heating time of, for example, "40", and a twelfth character string indicating a unit of the heating time, for example, "second" are in this order a string.

In the present embodiment, “W (Watt)”, which is an SI unit representing heat quantity, is used as the second character string and the eighth character string, but if it represents a unit of heating power, It may be another character or unit. Moreover, although "minute" or "second" was used as a character showing a unit of time as a 4th character string, a 6th character string, a 10th character string, and a 12th character string, a unit of time is shown If it is, it may be another character or unit.

The reading unit 21 extracts a portion where the heating control information 23 attached to the product is displayed from the image captured by the camera 17, and reads characters (including at least numbers) of the heating control information 23.

Here, at least a part of the functions of the heating control unit 15, the reading unit 21, and the heating control information calculation unit 30 (described later) may be realized by, for example, a microcomputer and a peripheral circuit.

The microcomputer and the peripheral circuit may have any form as long as the control described later is performed. At least a part of the functions of the heating control unit 15, the reading unit 21, and the heating control information calculation unit 30 may be configured by an arithmetic processing unit and a storage unit that stores a control program. As an arithmetic processing part, MPU (Micro Processing Unit) and CPU (Central Processing Unit) are illustrated. A memory is exemplified as the storage unit. The control program stored in the storage unit is executed by the arithmetic processing unit.

In addition, at least a part of the functions of the heating control unit 15, the reading unit 21, and the heating control information calculation unit 30 may be configured by hard logic. If configured with hard logic, it is effective to improve processing speed. Each component may be configured by one semiconductor chip or may be physically configured by a plurality of semiconductor chips. When at least a part of the functions of the heating control unit 15, the reading unit 21, and the heating control information calculation unit 30 are constituted by a plurality of semiconductor chips, each control described later should be realized by a separate semiconductor chip. You can also.

FIG. 3 is a view showing an example of the seal 20 applied to the product.

The sticker 20 includes various items such as a product name 22, heating control information 23, amount information 24, consumption term information 25, bar code 26 which is an example of a code symbol specifying a product, nutrition information 27, and notification information 28, etc. Information is displayed.

In order to easily extract the heating control information 23 from such various information, the seal 20 has a mark frame 29 which is a rectangular position designation mark formed so as to surround the heating control information 23. It is displayed.

The reading unit 21 first extracts the mark frame 29 from the image captured by the camera 17. Next, the reading unit 21 reads the alphanumeric characters surrounded by the mark frame 29 with the character string “500 W 2001500 W 040”. Here, the reading unit 21 does not read characters representing a unit of time such as "minutes" and "seconds", or does not use them for analysis even if they are read.

Then, the reading unit 21 follows the predetermined analysis rule, and the character string is a number string up to “W”, a 3-digit number string after “W”, a number up to “W” following the number string Break it up into four of the sequence and the three digit string after the "W" to get "500", "200", "1500", "040".

Furthermore, the reading unit 21 analyzes that the unit of the first digit of each of the second digit string and the fourth digit string is “minute” and the unit of the second digit is “second”.

In the reading unit 21, the first digit string is the heating power, which corresponds to the heating time of the second digit string, the third digit string is the heating power, and the fourth digit string is heated. Analyze as corresponding to time.

As a result, the reading unit 21 reads the heating control information “2 minutes at 500 W” and “40 seconds at 1500 W”.

Returning to FIG. 2, the description of the microwave oven 1 is continued. The user opens the door 3 and places the product in the heating cabinet 13. Then, the user closes the door 3 and presses the heating start button 10. The reading unit 21 reads the heating control information from the image in the heating chamber 13 taken by the camera 17 as described above.

The reading unit 21 sends the read heating control information to the heating control information calculation unit 30. The heating control information calculation unit 30 has a power conversion unit 31 and a switching unit 32.

Next, the power conversion unit 31 will be described. First, the difference in heating power (hereinafter referred to as maximum output) that can be maximum output depending on the type of microwave oven will be described.

In general, the maximum output of the microwave oven varies depending on the model. In a conventional standard microwave oven, the maximum output of a household microwave oven is 500 W, and the maximum output of a business microwave oven is often 1500 W.

However, there is always a demand from the user for shortening the heating time by outputting stronger heating power. Therefore, in recent years, even when the voltage and current of the power supply input to the microwave oven 1 are the same, a microwave oven with improved conversion efficiency to heating power and high maximum output is being sold.

For example, microwave ovens having a maximum output of 800 W for household use and a maximum output of 1800 W for commercial use are being sold. For this reason, conventional microwave ovens (for example, household microwave ovens with a maximum output of 500 W or commercial microwave ovens with a maximum output of 1500 W) and microwave ovens (eg, with a maximum output of 1500 W) are on the market in recent years The maximum output is 800 W for a household microwave oven, or the maximum output is for a commercial microwave oven at 1800 W). For this reason, the maximum output differs depending on the type of microwave oven.

On the other hand, the heating control information 23 (for example, the heating power and heating time described in the seal 20) given to the goods are various heating powers and all combinations of heating times corresponding to the respective heating powers. It is difficult.

Therefore, the heating power described in the seal 20 can be used in common with the conventional low-power microwave oven and the high-power microwave oven sold in recent years, the low-power microwave oven Display according to

For example, only two combinations of a standard heating power of 500 W for household use, and a corresponding heating time, and a standard heating power of 1500 W for commercial use and a corresponding heating time , Is displayed on the seal 20 as heating control information.

As a result, using a high maximum power microwave oven, the user can set a heating time shorter than the heating time (hereinafter referred to as the display time) displayed on the seal 20 as the heating time at the maximum heating power. It can be set manually and used.

In addition, even in the case of a microwave oven having a high maximum output, the user can also perform heating using the display time with the same low heating power as in the prior art by suppressing the heating power of the microwave oven.

However, for example, at a store that provides a heating service by heating and providing the purchased food with a microwave oven, the user sets the heating time accurately which is different from the display time while dealing with many customers. It is difficult to do. For this reason, the store clerk of the store does not heat at the maximum output of the microwave, but heats at a low heating power corresponding to the display time. Then, originally, the high maximum output of the microwave oven can not be utilized, and the heating time can not be shortened.

In order to eliminate this point, the microwave oven 1 is provided with a power converter 31. The power conversion unit 31 is at least one of the combination of heating power and heating time described on the seal 20 as the heating control information 23 given to the product (first heating power and first heating time) Are received from the reading unit 21.

In addition, the power conversion unit 31 receives from the heating control unit 15 the numerical value of the maximum output that can be heated by the microwave oven 1.

Then, the power conversion unit 31 performs a power conversion operation to convert the heating time included in the heating control information 23 into the heating time corresponding to the maximum output of the microwave oven 1. In the microwave oven 1, if the total amount of heat applied to the food (product of the heating power and the heating time) is equal, equal heating can be performed, so that the product of the heating power and the heating time becomes equal, heating control information The heating time included in 23 may be converted.

Specifically, the power conversion unit 31 divides the product of the heating power and the heating time corresponding to the heating power, which is included in the heating control information 23, by the maximum output received from the heating control unit 15. Thus, the power conversion unit 31 performs a power conversion operation to convert the heating time included in the heating control information 23 into the heating time corresponding to the maximum output of the microwave oven 1.

For example, when the reading unit 21 reads a heating time of 40 seconds as the heating time of the heating power 1500 W, the power conversion unit 31 receives 60000 J, which is the product of 40 seconds and 1500 W, from the heating control unit 15 The heating time is calculated as 33 seconds by dividing by the maximum output of 1800 W. Here, the value after the decimal point is truncated for convenience. The calculated heating power and heating time are respectively the second heating power and the second heating time.

The power conversion operation performed by the power conversion unit 31 does not necessarily have to be the operation of dividing the product of the heating power and the heating time corresponding to the heating power contained in the heating control information 23 by the maximum output. .

In short, the relationship between the combination of the heating power and the heating time corresponding to the heating power contained in the heating control information 23 and the combination of the heating power which is the maximum output of the microwave oven 1 and the corresponding heating time is inversely proportional Apply and calculate.

Here, the case where the power conversion unit 31 receives a plurality of combinations of heating power and heating time described on the seal 20 from the reading unit 21 as the heating control information 23 applied to the product will be described.

For example, products such as lunch boxes and sugar beets often have a heating time for heating at 500 W, which is a standard when heating in a general household microwave oven, and a larger heating power. The heating time for heating at 1500 W, which is a standard for heating with a microwave oven, is also described.

In such a case, based on any combination of the small heating power and the combination of the heating time corresponding to the heating power, and the combination of the larger heating power and the heating time corresponding to the heating power. Power conversion operation of In general, the power conversion operation based on any combination results in almost the same operation result.

More desirably, of the combination of a small heating power and a heating time corresponding to the heating power, and the combination of a larger heating power and a heating time corresponding to the heating power, the maximum output received from the heating control unit 15 The power conversion operation may be performed based on the combination of the heating power of the closer one and the corresponding heating time.

For example, if the reading unit 21 reads 2 minutes as the heating time corresponding to 500 W and 40 seconds as the heating time corresponding to 1500 W, and the maximum output of the microwave oven 1 is 1800 W, the power conversion unit 31 measures 1500 W It is more desirable to calculate the heating time corresponding to 1800 W based on the corresponding heating time of 40 seconds.

In the explanation so far, it has been described that equal heating can be performed if the total amount of heating heat (product of heating power and heating time) input to food is equal in the microwave oven 1, but the following may not be Explain to.

Each food has a limit on the amount of heating power it can absorb. Even if the heating power is increased beyond the limit, it is not absorbed by the food and returns to the magnetron 14 to raise the temperature of the magnetron or raise other parts. Such a limit of heating power that can be absorbed by food is defined as saturated heating power. If it does so, as shown in FIG. 4, saturated heating power will be in a relation substantially proportional to the water content (weight) of foodstuffs.

In FIG. 4, for example, in a food having a water content of W1, the heating power is absorbed only up to E1. Assume that W1 is 100 g and E1 is 1000 W. Then, even if the heating power of 1500 W is applied to the food having a water content of 100 g, the food can absorb 1000 W even if the heating power of 1800 W is input, and the remaining 500 W and 800 W of heating power are Without entering the food, the magnetron 14 and other components will heat up.

Further, in the food having a water content of W2, the heating power is absorbed only up to E2, and this W2 is temporarily assumed to be 200 g and E2 to be 1500 W temporarily. Then, even if the heating power of 1800 W is applied to the food having a water content of 200 g, 1500 W can absorb the food, and the remaining 300 W of heating power does not enter the food, and the magnetron 14 and other parts To raise the temperature.

Thus, in the case of food with a saturation heating power of less than 1500 W, the heating power that can be absorbed by the food is the same whether heating at 1500 W or heating at 1800 W, even if heating at 1800 W, the heating time Does not contribute to shortening of

The relationship between the water content and the appropriate upper limit power that the food can absorb is shown in the table in FIG.

For example, in the case of a food having a water content of 100 g, it is desirable to heat the food at an upper limit of 500 W if the food has a saturation heating power of 1000 W and a water content of less than 100 g.

Further, assuming that the saturation heating power of a food having a water content of 200 g is 1,500 W, it is desirable to heat the food at an upper limit of 1000 W if the food has a water content of 100 g to less than 200 g.

Further, assuming that the saturation heating power of a food having a water content of 300 g is 1,800 W, it is desirable to heat the food at an upper limit of 1,500 W if the food has a water content of 200 g or more and less than 300 g. In the case of a food having a water content of 300 g or more, heating at an upper limit of 1800 W is desirable.

FIG. 6 shows the relationship between the water content of the food and the heating time required to heat the food to a certain temperature.

As apparent from FIG. 6, in the region where the water content of the food is less than W1 (for example, less than 100 g), the same heating time is required whether the heating power is 1000 W, 1500 W or 1800 W.

In the region where the water content of the food is less than W2 (for example, less than 200 g), the same heating time is required whether the heating power is 1500 W or 1800 W.

Where the heating power is 1500 W or 1800 W, the product of the heating time and the heating power is equal in the region where the water content of the food is W3 or more (eg, 300 g or more).

FIG. 7 shows an example of appropriate heating time when the heating power is 1500 W and 1800 W.

When the heating power is 1500 W, the water content is 200 g or more, and the water content and the heating time have a proportional relationship.

In addition, when the heating power is 1800 W, the water content is 300 g or more, and the water content and the heating time are in a proportional relationship.

Then, in the region where the water content is 200 g or less, the necessary heating time is the same regardless of whether the heating power is 1500 W or 1800 W.

And in a region where the water content is 200 g or more and less than 300 g, although heating at 1800 W is shorter than heating at 1500 W, the product of heating power and heating time is not equal. At 300 g or more, the product of the heating time and the heating power is equal.

Returning to FIG. 2, the switching unit 32 will be described.

In the above-described embodiment, the method of calculating the heating time at 1800 W from the heating time at 1500 W in the power conversion unit 31 has been described. However, due to the nature of the microwave oven, this calculation method does not hold in the region where the water content of the food is less than W3 (eg, less than 300 g). In particular, in the region of less than W2 (e.g., less than 200 g), there is no difference in heating time between heating at 1800 W and heating at 1500 W.

Therefore, from the heating time at 1500 W read by the reading unit 21, the switching unit 32 switches whether to convert the heating time at 1800 W by the power conversion unit 31 or, instead, to use the heating time at 1500 W as it is .

Specifically, the switching unit 32 performs heating at 1500 W, which is read by the reading unit 21 based on the heating time T3 (for example, 30 seconds) at 1500 W when the water content W3 of the food (for example, 300 g) If the time is longer than T3 (for example, 30 seconds or more), the power conversion unit 31 performs the power conversion calculation.

The switching unit 32 uses the heating time T3 (for example, 30 seconds) at 1500 W when the water content W3 (for example, 300 g) of food is used, and the heating time at 1500 W read by the reading unit 21 is T3. If it is shorter (for example, less than 30 seconds), the heating time at 1500 W read is used as it is.

When the heating control information calculation unit 30 determines that the heating power conversion is performed as a result of determining whether the switching unit 32 converts the heating power, the heating time at which the power conversion calculation is performed by the power conversion unit 31 and the heating time conversion; Information on heating power of 1800 W is sent to the heating control unit 15 as heating control information.

On the other hand, when the heating control information calculation unit 30 determines that the switching unit 32 does not convert the heating power, the information read by the reading unit 21, that is, the heating power of 1500 W and the information of the heating time at 1500 W are heated. It sends to the heating control unit 15 as control information.

The heating control unit 15 sends the heating control information received from the heating control information calculation unit 30 to the operation display unit 6, and the operation display unit 6 displays the heating time of the heating control information on the liquid crystal display 7.

If it is determined that the heating power conversion is performed by the switching unit 32, the power switching indicator 8 is turned on, and if it is determined that the power conversion is not performed, the power switching indicator 8 is turned off.

The heating control unit 15 controls the heating of the magnetron 14 so as to heat the object to be heated with the heating power and the heating time of the heating control information received from the heating control information calculation unit 30.

The calculation function of the heating control information calculation unit 30 will be described by applying specific numerical values. Assuming that the heating time T3 at the heating power 1500 W is 30 seconds, when the reading unit 21 reads “40 seconds at 1500 W”, the power conversion unit 31 multiplies 1500 W by 40 seconds to calculate 60000 J. Then, it is divided by 1800 W to calculate 33 seconds, which is sent to the heating control unit 15 as the heating control information “1800 W for 33 seconds”.

On the other hand, when the reading unit 21 reads "1500 W for 20 seconds", the heating control information of "1500 W for 20 seconds" is sent to the heating control unit 15 as it is.

Next, the operation steps of the microwave oven 1 of the present embodiment will be described.

FIG. 8 is a flowchart showing the flow of the operation of the heating control unit 15, the reading unit 21 and the heating control information calculation unit 30 in the present embodiment.

In step S1, the reading unit 21 determines whether or not the heating start button 10 is pressed by the user, and when pressed (S1, YES), the process proceeds to step S2. On the other hand, if the heating start button 10 is not pressed (S1, NO), the reading unit 21 repeats step S1 and waits for the heating start button 10 to be pressed.

In step S2, the reading unit 21 causes the camera 17 to capture an image of the bottom surface of the heating chamber 13. Thereafter, the process proceeds to step S3.

In step S3, the reading unit 21 searches for the mark frame 29 in the image. If the mark frame 29 is found (S3, YES), the process proceeds to step S4. On the other hand, if the mark frame 29 is not found (S3, NO), the reading unit 21 proceeds to step S11.

In step S4, the reading unit 21 reads the alphanumeric characters enclosed by the mark frame 29, and in the case of the example of the seal illustrated in FIG. 3, reads the character string "500W2001500W040". Then, according to a predetermined analysis rule, the character string is analyzed as two sets of heating control information of “2 minutes at 500 W” and “40 seconds at 1500 W”. Thereafter, the process proceeds to step S5.

In step S5, the switching unit 32 determines whether to perform power conversion. Specifically, it is determined whether or not the heating time at 1500 W of the heating control information read by the reading unit 21 is T3 or more, and the power conversion is performed if the heating time at 1500 W is T3 or more; It is determined not to

Assuming that T3 is 30 seconds, the switching unit 32 determines that power conversion is to be performed because “1500 W 40 seconds” in the example of the seal of FIG. 3, which is longer than 30 seconds. If power conversion is to be performed (S5, YES), the process proceeds to step S6. On the other hand, when the switching unit 32 determines that power conversion is not performed (S5, NO), the process proceeds to step S10.

The heating control information calculation unit 30 receives in advance from the heating control unit 15 that the maximum output of the microwave oven 1 is 1800 W. Then, in step S6, the heating control information calculation unit 30 selects the heating power closer to the maximum output received from the heating control unit 15 among the plurality of pieces of heating control information received from the reading unit 21, and the corresponding heating time Calculate the product of Specifically, the heating control information calculation unit 30 performs an operation of 1500 × 40 = 60000 J using 1500 W close to 1800 W and 40 seconds corresponding to it among the plurality of heating control information, and Further, 60000 J is divided by 1800 W to calculate a heating time of 33 seconds. Then, the process proceeds to step S7.

In step S7, the heating control information calculation unit 30 sends the heating control unit 15 that the heating time is 33 seconds after the above calculation and the heating power is 1800 W after conversion. The heating control unit 15 turns on the power switching indicator 8 of the operation display unit 6. Then, the process proceeds to step S8.

In step S8, the heating control unit 15 causes the liquid crystal display 7 of the operation display unit 6 to display the heating time. In this case, “33 seconds” is displayed and the process proceeds to step S9.

Then, in step S9, the heating control unit 15 drives the magnetron 14 to start heating. During heating, the liquid crystal display 7 of the operation display unit 6 performs countdown display from 33 seconds, and the power switching display 8 continues to light.

If power conversion is not performed in step S5, for example, if the heating time of 1500 W read by the reading unit 21 is 20 seconds shorter than T3 (for example, 30 seconds) (S5, NO), the process proceeds to step S10. In step S10, the heating control information calculation unit 30 does not perform power conversion, and sends to the heating control unit 15 the heating power 1500 W that is the heating control information that has been read, and 20 seconds that is the heating time. The heating control unit 15 turns off the power switching indicator 8 of the operation display unit 6. Then, the process proceeds to step S8.

In step S8, the heating control unit 15 causes the liquid crystal display 7 of the operation display unit 6 to display “20 seconds”.

If no mark frame is found in step S3 (S3, NO), the process proceeds to step S11. If the mark frame is not found, it may be considered that the user's operation error or the like, such as the food on which the heating control information is not originally displayed, is the cause. For this reason, the liquid crystal display 7 displays a reminder and heating is not performed.

As described above, according to the present embodiment, the reading unit 21 reads characters (including at least alphanumeric characters) of the heating control information 23 displayed on the product, and the heating control unit 15 is read based on the heating control information. Controls the magnetron 14. As a result, the salesperson automatically sets the heating time without inputting the heating time of the product or selecting the button corresponding to the product.

Moreover, when the microwave oven can output heating power larger than the heating power provided to goods, it can heat with the maximum output. Thereby, goods can be heated by heating time shorter than the heating time given to goods.

Further, by providing the switching unit 32, even if heating is performed with a heating power larger than the heating power displayed, heating is performed with the heating time as shown if there is no effect of shortening the heating time. Wasteful energy is not consumed. Thus, the object to be heated can be heated with an appropriate heating power.

In the present embodiment, the switching threshold of the switching unit is T3 of the heating time at 1500 W shown in FIG. 6, but may be switched depending on the heating time with another heating power. Further, even if the heating power is 1500 W, the threshold may be T2 instead of T3, and the heating time at 1800 W may be calculated by another calculation formula for a region of T2 or more and less than T3. Moreover, you may calculate heating time in another heating power, such as 1600W or 1700W.

Second Embodiment
Next, a second embodiment of the present disclosure will be described based on FIG.

In FIG. 9, the information having the same function as the component of FIG. 3 described in the first embodiment is assigned the same reference numeral, and the description is omitted.

FIG. 9 is an example of the seal 20 according to the second embodiment, but performing the power conversion is printed on the seal 20 as a power conversion symbol 33 which is a predetermined mark.

FIG. 10 shows a schematic configuration diagram of a microwave oven 1 according to the present embodiment.

In FIG. 10, elements having the same functions as the elements of FIG. 2 described in the first embodiment are assigned the same reference numerals and descriptions thereof will be omitted. Compared with the configuration of FIG. 2, the configuration of FIG. 10 is different in that the reading unit 21 includes the mark reading unit 34.

The reading unit 21 first extracts the mark frame 29 from the image captured by the camera 17. Then, the mark reading unit 34 searches for the power conversion symbol 33 in the vicinity of the mark frame 29.

For example, the mark reading unit 34 searches for the power conversion symbol 33 by determining whether or not there is a filled star shape in the vicinity of the short side of the rectangle of the mark frame 29. If the power conversion symbol 33 is found, the switching unit 32 determines that power conversion is to be performed, and if not, the switching unit 32 determines that power conversion is not to be performed.

The reading unit 21 sends the read heating control information 23 to the heating control information calculating unit 30. The reading unit 21 also sends information on the presence or absence of the power conversion symbol 33 read by the mark reading unit 34 to the heating control information calculation unit 30.

In the heating control information calculation unit 30, the switching unit 32 switches whether to perform power conversion based on the information sent from the reading unit 21 whether or not there is the power conversion symbol 33. When the switching unit 32 determines that power conversion is to be performed, the power conversion unit 31 performs power conversion. If the switching unit 32 determines that power conversion is not performed, the power conversion unit 31 does not perform power conversion.

The power conversion is similar to that of the first embodiment.

For example, in the case of the example of the seal 20 shown in FIG. 9, 1500 W is multiplied by 40 seconds to calculate 60000 J, which is divided by 1800 W to calculate 33 seconds. The subsequent operation is the same as that of the first embodiment, so the description will be omitted.

FIG. 11 is a flowchart showing the flow of the operation of the heating control unit 15, the reading unit 21 and the heating control information calculation unit 30 in the second embodiment.

In step S101, the reading unit 21 determines whether the heating start button 10 has been pressed by the user, and when it is determined that the heating start button 10 has been pressed (S101, YES), the process proceeds to step S102. On the other hand, if the heating start button 10 is not pressed (S101, NO), the reading unit 21 repeats step S101 and waits for the heating start button 10 to be pressed.

In step S102, the reading unit 21 causes the camera 17 to capture an image of the bottom surface of the heating chamber 13. Thereafter, the process proceeds to step S103.

In step S103, the reading unit 21 searches for a mark frame 29 in the image. If the mark frame 29 is found (S103, YES), the process proceeds to step S104. On the other hand, if the mark frame 29 is not found (S103, NO), the reading unit 21 proceeds to step S111.

In step S104, the reading unit 21 reads the alphanumeric characters surrounded by the mark frame 29, and in the case of the example of the seal illustrated in FIG. 9, the character string "500W2001500W040" is read. Then, the reading unit 21 analyzes the character string as two sets of heating control information “2 minutes at 500 W” and “40 seconds at 1500 W” according to a predetermined analysis rule. Thereafter, the process proceeds to step S105.

In step S105, the mark reading unit 34 determines whether or not the power conversion symbol 33 is present on the seal 20. In the example of the seal 20 of FIG. 9, it is determined that there is a star-shaped power conversion symbol 33 that is filled. Then, the switching unit 32 determines that power conversion is to be performed. If it is determined that power conversion is to be performed (S105, YES), the process proceeds to step S106. On the other hand, when it is determined that the power conversion is not to be performed (S105, NO), the process proceeds to step S110.

The heating control information calculation unit 30 receives in advance from the heating control unit 15 that the maximum output of the microwave oven 1 is 1800 W. Then, in step S106, the heating control information calculation unit 30 selects the heating power closer to the maximum output received from the heating control unit 15 among the plurality of pieces of heating control information received from the reading unit 21, and the corresponding heating Calculate the product of time.

Specifically, the heating control information calculation unit 30 performs an operation of 1500 × 40 = 60000 J using 1500 W closer to the maximum output 1800 W and the corresponding heating control information of 40 seconds. Then, the heating control information calculation unit 30 further divides 60000J by 1800 W to calculate a heating time of 33 seconds. Then, the process proceeds to step S107.

In step S107, the heating control information calculation unit 30 determines that the heating time is 33 seconds, which is the result of performing the above-described calculation, and that the heating power is 1800 W after conversion. Send to The heating control unit 15 turns on the power switching indicator 8 of the operation display unit 6. Then, the process proceeds to step S108.

In step S108, the heating control unit 15 causes the liquid crystal display 7 of the operation display unit 6 to display the heating time. In this case, "33 seconds" is displayed and the process proceeds to step S109.

In step S109, the heating control unit 15 drives the magnetron 14 to start heating. During heating, the liquid crystal display 7 of the operation display unit 6 performs countdown display from 33 seconds, and the power switching display 8 continues to light.

If it is determined in step S105 that power conversion is not to be performed (S105, NO), that is, if the mark reading unit 34 determines that there is no power conversion symbol 33, the process proceeds to step S110.

In step S110, the heating control information calculation unit 30 does not perform power conversion, and sends 1500 W and the heating time (for example, 20 seconds), which are the read heating control information, to the heating control unit 15. The heating control unit 15 turns off the power switching indicator 8 of the operation display unit 6. Then, the process proceeds to step S108. In this case, in step S108, the heating control unit 15 causes the liquid crystal display 7 of the operation display unit 6 to display "20 seconds".

Step S111 is performed when a mark frame is not found by step S103 (S103, NO). In this case, the user may have an operation error or the like, for example, a food on which the heating control information is not originally displayed. For this reason, a warning display is provided on the liquid crystal display 7, and heating is not performed.

As described above, according to the present embodiment, it is possible to switch whether or not to perform power conversion by displaying the power conversion symbol 33 on the seal 20 of the food. This allows the food producer to decide whether or not to perform power conversion. Whether the power conversion is to be performed can be determined based on the food-specific circumstances, such as not wanting to perform the power conversion regardless of the heating load of the food. Thus, the convenience is increased.

The power conversion symbol 33 may be substituted by, for example, a trademark or the like, and a product of a specific maker may perform power conversion, but a product without the conversion may not perform power conversion.

Note that, contrary to the above description, when the power conversion symbol 33 is found, the switching unit 32 may not perform power conversion, and when the power conversion symbol 33 is not found, the switching unit 32 may perform power conversion.

Third Embodiment
Next, a third embodiment of the present disclosure will be described. In the present embodiment, the heating load of the food to be heated is detected by the detection unit, and whether or not the switching unit 32 of the heating control information calculation unit 30 performs power conversion is switched according to the detected heating load. . The basic configuration of the microwave oven 1 of the third embodiment is the same as the configuration of the first embodiment or the second embodiment, except for the configuration described below.

In the present embodiment, an example in which a weight sensor is used as a detection unit that detects the heating load of food will be described.

FIG. 12 is a block diagram showing the main part of the present embodiment, and in the heating storage 13, an inner bottom plate 35 for loading food is provided.

Legs

36a, 36b and 36c are provided at three locations on the interior bottom plate 35, and

weight sensors

37a, 37b and 37c are attached to the

legs

36a, 36b and 36c, respectively. As a weight sensor, for example, a strain gauge or the like is used.

Then, the weight calculation unit 38 collects the outputs from the

weight sensors

37a, 37b and 37c, and calculates the weight given to the inner bottom plate 35 including the weight of the inner bottom plate 35. The weight calculation unit 38 subtracts the weight of the in-chamber bottom plate 35 that is known in advance from the calculated weight to calculate the weight of the food placed on the in-chamber bottom plate 35, and calculates the calculated weight It sends to the heating control information calculation unit 30.

For example, the switching unit 32 is previously determined not to perform power conversion if the weight of the food calculated by the weight calculating unit 38 is 350 g or more, and if the weight is less than 350 g. When the switching unit 32 determines that power conversion is to be performed, the power conversion unit 31 performs power conversion.

Here, the reason for switching whether to perform power conversion depending on the weight of the food is that the water content and the weight of the food are often in a proportional relationship. That is, there is no difference in water content, whether it is rice, vegetables or meat, and it is about 80 to 90%, so switching the power conversion by the weight of the food is almost the same as switching by the water content. .

The power conversion performed by the power conversion unit 31 is a process of calculating the heating time when heating at 1800 W which is the maximum output, from the heating time when heating at 1500 W read by the reading unit 21. This is a calculation process similar to that of the first embodiment and the second embodiment, and the subsequent operation is also the same as that of the first embodiment and the second embodiment, so that the description thereof Omit.

FIG. 13 is a flowchart showing the flow of the operation of the heating control unit 15, the reading unit 21 and the heating control information calculation unit 30 in the third embodiment.

In step S201, the reading unit 21 determines whether the user has pressed the heating start button 10. When the heating start button 10 is pressed (S201, YES), the reading unit 21 proceeds to step S202. On the other hand, if the heating start button 10 is not pressed (S201, NO), the reading unit 21 repeats step S201 and waits for the heating start button 10 to be pressed.

In step S <b> 202, the reading unit 21 causes the camera 17 to capture an image of the bottom surface of the heating chamber 13. Thereafter, the process proceeds to step S203.

In step S203, the reading unit 21 searches the mark frame 29 in the image. If the mark frame 29 is found (S203, YES), the process proceeds to step S204. On the other hand, if the mark frame 29 is not found (S203, NO), the reading unit 21 proceeds to step S211.

In step S204, the reading unit 21 reads the alphanumeric characters enclosed by the mark frame 29, and in the case of the example of the seal illustrated in FIG. 3, the character string "500W2001500W040" is read. Then, the reading unit 21 analyzes the character string as two sets of heating control information “2 minutes at 500 W” and “40 seconds at 1500 W” according to a predetermined analysis rule. Thereafter, the process proceeds to step S205.

In step S205, the heating control information calculation unit 30 determines whether the weight of the food calculated by the weight calculation unit 38 is equal to or more than a predetermined weight (350 g or more). If the weight of the food is equal to or more than the predetermined weight (S205, YES), the process proceeds to step S206. On the other hand, if the weight of the food is less than the predetermined weight (S205, NO), the process proceeds to step S210.

The heating control information calculation unit 30 receives in advance from the heating control unit 15 that the maximum output of the microwave oven 1 is 1800 W. Then, in step S206, the heating control information calculation unit 30 corresponds to the heating power closer to the maximum output received from the heating control unit 15 among the plurality of heating control information received from the reading unit 21. Calculate the product of the heating time.

Specifically, heating control information calculation unit 30 calculates 1500 × 40 = 60000 J using 1500 W close to 1800 W and 40 seconds corresponding to that, and further divides 60000 J by 1800 W. The heating time of 33 seconds is calculated. Then, the process proceeds to step S207.

In step S207, the heating control information calculation unit 30 determines that the heating time is 33 seconds as a result of the above calculation and that the heating power is 1800 W after conversion. Send to The heating control unit 15 turns on the power switching indicator 8 of the operation display unit 6. Then, the process proceeds to step S208.

In step S208, the heating control unit 15 causes the liquid crystal display 7 of the operation display unit 6 to display the heating time. In this case, "33 seconds" is displayed and the process proceeds to step S209.

In step S209, the heating control unit 15 drives the magnetron 14 to start heating. During heating, the liquid crystal display 7 of the operation display unit 6 performs countdown display from 33 seconds, and the power switching display 8 continues to light.

If it is determined in step S205 that power conversion is not to be performed, that is, if the weight of the food calculated by the weight calculation unit 38 is not equal to or more than the predetermined weight, the process proceeds to step S210.

In step S210, the heating control information calculation unit 30 does not perform power conversion, and sends 1500 W, which is the read heating control information, and a heating time (for example, 20 seconds) to the heating control unit 15. The heating control unit 15 turns off the power switching indicator 8 of the operation display unit 6. Then, the process proceeds to step S208. In this case, in step S208, the heating control unit 15 displays “20 seconds” on the liquid crystal display 7 of the operation display unit 6.

Step S211 is processing in the case where a mark frame is not found in step S203 (S203, NO), and a user's operation mistake or the like may be considered, such as a food for which heating control information is not originally displayed. Therefore, the alert display is performed on the liquid crystal display 7, and the heating is not performed.

In the present embodiment, the weight sensor has been described as a detection unit of heating load, but for example, the camera 17 may be used as a detection unit of heating load, and a food portion is extracted from a photographed image. May be estimated. Alternatively, for example, an infrared sensor may be provided to detect the surface temperature of the food without contact, and the heating load of the food may be estimated from the rate of increase of the surface temperature.

In the first to third embodiments, the heating control information is described as characters (including at least alphanumeric characters), but the present disclosure is not limited to this example. For example, a barcode obtained by encoding the heating control information, a two-dimensional code such as a QR code (registered trademark), or a unique code may be used. In these cases, an error detection bit or the like can be added, and the reading performance can be improved.

In addition, characters may be combined with a barcode or QR code etc. For example, the heating control information and the heating time may be described in characters, and whether or not power conversion is to be carried out may be It may be stored as 1-bit information.

Also, in the present embodiment, the case where two combinations of heating power and heating time are described in the seal 20 has been described, but at least one combination of heating power and heating time is described. Just do it.

Moreover, when reading the heating control information 23 from the seal 20, although it has been described that alphanumeric characters surrounded by the mark frame 29 are read, the present disclosure is not limited to this example. The heating control information 23 can be read with high accuracy by using a position designation mark of a predetermined shape having a predetermined positional relationship with the heating control information 23 instead of the mark frame 29. The position designation mark may be a predetermined figure, or a trade name or mark of a store.

As described above, according to the present disclosure, the user simply reads the heating control information provided to the product just by putting the product into the heating chamber, and appropriately heats the product based on the heating control information. Can. Therefore, there is no troublesome setting of the heating time, and the heating performance of the heating cooker can be maximized. Therefore, in addition to the business-use microwave oven used in shops for food etc., it can be used for household use. A microwave oven, a rice cooker, or IH cooking heater etc. can apply to cooking devices in general, and is useful.

Reference Signs List 1 microwave oven 2 housing 3 door 4 glass window 5 handle 6 operation display 7 liquid crystal display 8 power switching display 9 time setting button group 10 heating start button 11 cancel button 12 pause button 13 heating storage 14 magnetron (heating section )
15 heating control unit 16 illumination 17 camera (shooting unit)
18 door switch 19 projection 20 seal 21 reader 22 product name 23 heating control information 24 amount information 25 consumption time information 26 bar code 27 nutrition information 28 notice information 29 mark frame 30 heating control information calculation unit 31 power conversion unit 32 switching unit 33 power conversion symbol 34 mark reading unit 35

inner bottom plate

36a, 36b,

36c leg

37a, 37b, 37c weight sensor 38 weight calculating unit

Claims

A heating chamber in which the object to be heated is stored;
A heating unit configured to heat the object to be heated stored in the heating chamber;
An imaging unit for imaging the inside of the heating chamber;
A reading unit that reads heating control information including a first heating power applied to the object to be heated and a first heating time of the first heating power;
Based on the heating control information read by the reading unit, the first heating time is converted into a second heating time at a second heating power different from the first heating power of the heating control information. Power converter, and
A switching unit that switches whether to perform conversion of the power conversion unit;
Cooker equipped with.
The heating cooker according to claim 1, wherein the switching unit determines whether to convert the power conversion unit based on the heating control information read by the reading unit.
The reading unit includes a mark reading unit that reads a predetermined specific mark, and the switching unit determines whether to convert the power conversion unit based on a result read by the mark reading unit. The heating cooker of Claim 1 which determines.
It further comprises a detection unit for detecting the heating load of the object to be heated stored in the heating chamber,
The heating cooker according to claim 1, wherein the switching unit determines whether or not to convert the power conversion unit based on the heating load detected by the detection unit.