JP2009236414A - Cooking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve cleaning nature of a surface of a heat resistant plate in a cooking device with at least one face of a cooking chamber composed of the heat resistant plate made of inorganic material. <P>SOLUTION: A bottom plate 6 composing a bottom face of the cooking chamber 3 and a rear part plate 7 composing a rear face are formed of a heat resistant plate made of ceramics, and a film 35 containing silicon oxide and zirconium oxide is provided on an upper face of the bottom plate 6 and a front face of the rear part plate 7. By providing the film 35, surfaces of the bottom plate 6 and the rear part plate 7 become smooth, and since the film 35 is superior in hydrophilic property, even if smudge is adhered to a surface of the film 35, by applying moisture to the smudged portion, the moisture becomes easy to penetrate between the smudge and the film, and it becomes easy to take off the smudge. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooking device having a configuration in which at least one surface of a cooking chamber is formed of a heat-resistant plate made of an inorganic material.

  2. Description of the Related Art Conventionally, in a cooking device that cooks food to be cooked stored in a cooking chamber by using a microwave or a heater as a heating means, oil smoke generated during cooking or cooking utensils (food baskets) in the cooking chamber. There were cases where these adhered to the inner wall surface and burned. When the food cake adheres and sticks in this way, there is a problem in terms of hygiene. In addition, the food cake may generate odor, and problems such as transfer of the odor to the food to be cooked have occurred. Moreover, in the case of what cooks with a microwave, when the wall surface of the cooking chamber gets dirty, the reflectance of the microwave is lowered, and the efficiency of heating the food (food) to be cooked may be lowered. In addition, when a large amount of food basket is attached to the wall of the cooking chamber, microwaves may be absorbed here, and if it is carbonized by heating, there is a risk of ignition from here. There was also a problem above. For this reason, it is necessary to clean the cooking chamber.

  On the other hand, as a means for coping with such a situation, for example, it is conceivable to form a film containing a fluororesin on the inner wall surface of the cooking chamber so as to make it difficult to be stained. By such means, even if dirt adheres to the surface of the cooking chamber wall surface, the dirt is easily peeled off due to the non-adhesiveness of the fluororesin. However, a film containing a fluororesin has a low heat-resistant temperature, and generally cannot be used on the inner wall surface of a cooking chamber at 270 ° C. or more because the film melts, deteriorates or decomposes.

  As another means, a method of putting an oxide catalyst mainly composed of manganese in the film and oxidatively decomposing the adhered oil or the like can be considered. Although this method can save time and effort for cleaning, the surface of the film is porous in order to maintain the activity of the catalyst, and there are many irregularities, so that a large amount of dirt adhered to the surface tends to stick. Further, this film generally adheres to a metal, but has a drawback that it cannot be applied to a ceramic plate or a glass plate.

Further, as another means, a steam supply means capable of supplying steam into the cooking chamber is provided, and the steam supply means supplies steam to the cooking chamber while the cooking chamber is heated to an appropriate temperature. It has been proposed that moisture is included in the dirt attached to the inner wall surface of the cooking chamber so that the dirt can be easily wiped off by causing condensation on the inner wall surface of the room (see, for example, Patent Document 1). .
JP 2006-84126 A

  However, even if the means described in Patent Document 1 described above is adopted, the cleaning property is not so good. In particular, when one side of the wall surface of the cooking chamber is made of a ceramic plate capable of transmitting microwaves, there is a problem that dirt penetrates into fine cracks on the surface of the ceramic plate, and it is difficult to remove the dirt. .

  The present invention has been made in view of the above-described circumstances, and the object thereof is to improve the cleanability of the surface of the heat-resistant plate in the case where at least one surface of the cooking chamber is constituted by a heat-resistant plate made of an inorganic material. It is in providing the heating cooker which can be made to be.

  In order to achieve the above-described object, at least one surface of the heating cooker according to the present invention is formed of a heat-resistant plate made of an inorganic material, and a cooking chamber in which an object to be cooked is accommodated, and the cooking chamber is accommodated in the cooking chamber. And a heating means for heating the object to be cooked, wherein a film containing silicon oxide and zirconium oxide is provided on the surface of the heat-resistant plate facing the cooking chamber.

  By providing the film on the surface facing the cooking chamber in the heat resistant plate, even if there are holes such as fine cracks on the surface of the heat resistant plate, the holes are closed and the surface becomes smooth. And since the film is excellent in hydrophilicity, even if dirt adheres to the surface of the film, by giving moisture to the dirt part, moisture easily enters between the dirt and the film, It becomes easy to remove dirt. For this reason, it becomes possible to improve the cleanability of the surface of a heat-resistant board.

  Further, the film is vitreous and has a very high hardness, and since it contains zirconium oxide or the like, it is difficult to peel off, and there is no problem even if it is rubbed with a scrubbing brush, and the dirt can be easily removed. Furthermore, the film has high heat resistance and can be used without any problem even at cooking temperatures of 270 ° C. or higher, and there are no problems such as film peeling and generation of harmful gases. In addition, since the coating contains zirconium oxide and the like, the far infrared emissivity is high, and it is possible to efficiently carry out cooking of food.

Hereinafter, an embodiment in which the present invention is applied to a microwave oven as a heating cooker will be described with reference to the drawings.
First, FIG. 1 shows a vertical side view of the microwave oven. In FIG. 1, the main body of the microwave oven is configured by disposing an inner box 2 made of a metal plate having an opening on the front surface inside an outer box 1 having an opening on the front surface. The interior of the inner box 2 is a cooking chamber 3, and the front opening of the cooking chamber 3 is opened and closed by a door 4 that rotates in the vertical direction.

  A recess 5 is formed at the bottom of the inner box 2, and a rectangular bottom plate 6 is disposed in the recess 5. The mounting structure of the bottom plate 6 will be described later. The bottom plate 6 constitutes the bottom surface of the cooking chamber 3. The bottom plate 6 is made of an inorganic material such as ceramic and constitutes the heat resistant plate of the present invention. A rear plate 7 is disposed at the rear of the cooking chamber 3 on the front side of the rear wall 2a of the inner box 2 via a spacer 7a. The rear part of the cooking chamber 3 has a double structure of the rear plate 7 and the rear wall 2a of the inner box 2. The rear plate 7 is also made of an inorganic material such as ceramic, like the bottom plate 6, and constitutes the heat resistant plate of the present invention. In this case, in the cooking chamber 3, the left and right side surfaces and the ceiling surface are constituted by the left and right side walls and the ceiling wall of the inner box 2, the bottom surface is constituted by the bottom plate 6, and the rear surface is formed by the rear plate 7 and the rear wall 2a of the inner box 2. It is composed of a double structure.

  A machine room 8 is formed at the rear of the main body between the outer box 1 and the inner box 2. In addition to the magnetron (heating means) 9, the machine room 8 is provided with a power supply device for the magnetron 9 (not shown), a cooling fan for cooling the magnetron 9 and the power supply device, and the like. The magnetron 9 generates microwaves, and the generated microwaves are supplied into the cooking chamber 3 through the bottom plate 6 through the waveguide 12 disposed below the inner box 2. ing. The microwave supplied to the cooking chamber 3 is supplied to the cooking object (not shown) accommodated in the cooking chamber 3 so that the cooking object is heated. The magnetron 9 functions as a heating means for heating an object to be cooked accommodated in the cooking chamber 3.

  A lower heater (heating means) 15 made of a planar electric heater is disposed on the lower surface of the bottom plate 6. An upper heater (heating means) 16 made of a planar electric heater is disposed on the upper surface of the ceiling portion of the inner box 2. The lower heater 15 and the upper heater 16 also function as heating means for heating an object to be cooked (not shown) accommodated in the cooking chamber 3.

  A casing 19 of a hot air supply device 18 (heating means) is provided on the rear surface of the inner box 2, and a hot air fan 21 that is rotationally driven by a fan motor 20 and an electric heater for hot air are provided in the casing 19. A heater 22 is provided. A heat shield cover 19 a is attached to the outside of the casing 19. As shown in FIG. 2, the rear wall 2 a of the inner box 2 is formed with a suction port 23 made up of a large number of small holes located in a portion corresponding to the central portion of the hot air fan 21. An air outlet 24 formed of a large number of small holes is formed around the mouth 23. The rear plate 7 located at the front portion of the rear wall 2 a is formed with an opening 25 at a portion corresponding to the suction port 23 and the blowout port 24.

  In the hot air supply device 18, when the hot air fan 21 is rotated by the fan motor 20, the air in the cooking chamber 3 is sucked into the casing 19 from the suction port 23 and is heated by the hot air heater 22 to become hot air. The hot air is discharged into the cooking chamber 3 from the surrounding air outlet 24. Due to such hot air circulation, the cooking object (not shown) accommodated in the cooking chamber 3 is cooked. This hot air supply device 18 also functions as a heating means for heating the cooking object accommodated in the cooking chamber 3. On the inner surfaces of the left and right side walls of the inner box 2, shelf receiving portions 26 for placing the shelves are provided in two upper and lower stages.

  Moreover, as shown in FIG. 3, the water vapor | steam supply apparatus 27 which comprises a water vapor | steam supply means is provided in the outer side of the inner box 2 in a main body. The steam supply device 27 includes a steam generation container 28 provided on the left side wall of the inner box 2, a steam heater 29 provided in the steam generation container 28, and a water storage unit 30 provided below the inner box 2. And a water supply passage 31 that allows the water vapor generation container 28 and the water storage section 30 to communicate with each other, a pump 32 provided in the middle of the water supply passage 31, and a water vapor supply port 33a provided on the left side wall of the inner box 2. And a member 33. The water vapor supply device 27 heats the water vapor generation container 28 with a water vapor heater 29 and supplies water in the water storage section 30 into the water vapor generation container 28 through a water supply path 31 with a pump 32. It has a function of generating water vapor inside and supplying the generated water vapor into the cooking chamber 3 from the water vapor supply port 33a.

  Here, a coating 35 containing silicon oxide, zirconium oxide, an alkaline earth metal compound, and water is provided on the upper surface of the bottom plate 6 that faces the cooking chamber 3. This film 35 is excellent in hydrophilicity. The coating 35 is provided on the bottom plate 6 as follows, for example. First, silicon oxide, zirconium oxide, an alkaline earth metal compound, water, and an appropriate amount of alcohol as a solvent other than water are mixed to prepare a coating material for film formation. And this coating material is apply | coated only to the single side | surface of the baseplate 6 using a spray. Thereafter, the coating 35 is formed by blowing hot air on the bottom plate 6 and drying it. The paint may be applied by roller coating.

  As shown in FIG. 4, the bottom plate 6 provided with the coating 35 is bonded and fixed to the peripheral edge of the opening of the recess 5 at the bottom of the inner box 2 with an adhesive 36 such as heat-resistant silicone. The bottom plate 6 is supported by a step portion 5 a formed at the peripheral edge of the recess 5. At this time, since the adhesive 36 is adhered to the end surface 6a around the bottom plate 6, the coating 35 is not provided on the end surface 6a (see FIG. 5A). By doing in this way, it can prevent that the adhesive strength of the adhesive agent 36 falls. Incidentally, as shown in FIG. 5 (b), when the coating 35 is also provided on the end surface 6a around the bottom plate 6, the coating 35 is hydrophilic, so that moisture generated during cooking or cleaning can be reduced. There is a possibility that the adhesive 36 and the coating 35 can easily enter, the adhesive strength by the adhesive 36 is lowered, and the bottom plate 6 is easily peeled off. In this respect, such a problem can be prevented by adopting the configuration of the present embodiment.

  Further, when the bottom plate 6 is bonded and fixed with the adhesive 36 in this way, a paint that can be discolored when heated and dried is put in the paint for forming the film. Since the place where the coating is applied when it is applied to the bottom plate 6 can be easily understood, it can be easily understood even if the paint adheres to a place other than the necessary place. The dye is preferably a water-soluble dye such as methylene blue or eosin.

  In addition, a film 35 similar to that of the bottom plate 6 is provided on the front surface of the rear plate 7 that faces the cooking chamber 3. The rear plate 7 is also not shown in detail, but is bonded and fixed to the front surface of the rear wall 2a of the inner box 2 with an adhesive. Also in this case, the coating 35 is not provided on the portion of the rear plate 7 where the adhesive is applied. A coating 35 similar to that of the bottom plate 6 is provided over the entire front surface of the rear wall 2a of the inner box 2.

Although not shown, an operation panel is provided on the lower front surface of the door 4. The operation panel is provided with a plurality of operation units 41 and a display unit 42 (all of which are shown in FIG. 6).
FIG. 6 is a block diagram schematically showing an electrical configuration in the microwave oven of the present invention. In FIG. 6, the control device 43 is constituted by a microcomputer and functions as a control means for controlling the overall operation of the microwave oven. Signals from the operation unit 41, the internal temperature sensor 44, the infrared sensor 45, the steam temperature sensor 46, the door switch 47, and the like are input to the control device 43. Of these, the internal temperature sensor 44 is formed of, for example, a thermistor, and detects the temperature in the cooking chamber 3. The infrared sensor 45 detects the temperature of the cooking object housed in the cooking chamber 3. The steam temperature sensor 46 is formed of, for example, a thermistor and detects the temperature of the steam generation container 28. The door switch 47 detects opening / closing of the door 4.

  And the control apparatus 43 is based on these input signals and the control program with which it prepared beforehand, the display part 42, the alarm 48, the magnetron 9, the upper heater 16, the lower heater 15, the fan motor 20, the heater 22 for hot air, It has a function of controlling the pump 32, the steam heater 29, the interior lamp 49, the ventilation fan 50, and the like. Among these, the notification device 48 is a buzzer for notification, the interior lamp 49 illuminates the inside of the cooking chamber 3, and the ventilation fan 50 ventilates the inside of the cooking chamber 3.

Next, the operation of the above configuration will be described.
When cooking, generally, the food to be cooked is accommodated in the cooking chamber 3 and placed on the bottom plate 6 or placed on a shelf hung on the shelf receiving portion 26 and the door 4 is closed. Then, the operation unit 41 of the operation panel 40 is selectively operated to start cooking. Then, the control device 43 operates the magnetron 9, the upper heater 16, the lower heater 15, the hot air heater 22 and the fan motor 20 of the hot air supply device 18, or the pump 31 and the water vapor heater 29 of the water vapor supply device 27. Cook the food to be cooked.

  And while repeating such heat cooking, when the wall surface of the cooking chamber 3 becomes dirty with the oil or food basket etc. which came out of the to-be-cooked object, and the stage which should be cleaned is reached, a user goes into the cooking chamber 3. In a state where the object to be cooked is not accommodated, the operation unit 41 of the operation panel is operated to execute the “cleaning mode”.

  FIG. 7 shows the execution contents of the “cleaning mode” of the control device 43. First, the interior lamp 49 is turned on to illuminate the cooking chamber 3 (step S1). Next, the temperature in the cooking chamber 3 is detected by the internal temperature sensor 44 (the temperature in the cooking chamber 3 can also be detected by the infrared sensor 45), and it is determined whether or not the detected temperature is 60 ° C. or less. (Step S2). When the temperature in the cooking chamber 3 is high just after the oven cooking and the temperature detected by the internal temperature sensor 44 exceeds 60 ° C., cooking is performed even if steam is supplied into the cooking chamber 3 as described later. Condensation does not occur on the wall surface in the chamber 3. For this reason, when the temperature detected by the internal temperature sensor 44 exceeds 60 ° C., the process waits until it reaches 60 ° C. or less.

  If the detected temperature of the internal temperature sensor 44 is 60 ° C. or lower (YES), the process proceeds to step S3, and it is determined whether or not the detected temperature of the internal temperature sensor 44 is 40 ° C. or higher. Here, when the temperature detected by the internal temperature sensor 44 is lower than 40 ° C. (NO), the upper heater 16 and the lower heater 15 are energized to heat the cooking chamber 3 to 40 ° C. or more (step) S3, S4). In order to give moisture to dirt and make it easy to remove dirt, it is preferable that the temperature in the cooking chamber 3 is somewhat high, for example, about 50 ° C. is preferable. If it judges that the inside of the cooking chamber 3 is 40 degreeC or more (YES), it will transfer to step S5 and will cut off the upper heater 16 and the lower heater 15. FIG. Thereafter, the steam heater 29 of the steam supply device 27 is energized to heat the steam generating container 28 (step S6). Then, while detecting the temperature of the steam generation container 28 by the steam temperature sensor 46, the steam generation container 28 is heated until the temperature detected by the steam temperature sensor 46 reaches 180 ° C. (steps S6 and S7).

  When the temperature detected by the water vapor temperature sensor 46 reaches 180 ° C. (YES), the process proceeds to step S 8, the pump 31 is turned on, and the water in the water storage unit 30 is supplied to the water vapor generation container 28. Thereby, water vapor | steam is generated in the water vapor generation container 28, and the water vapor is supplied into the cooking chamber 3 from the water vapor supply port 33a. The water vapor supplied into the cooking chamber 3 is condensed on the wall surface in the cooking chamber 3, and the moisture penetrates into the dirt and softens the dirt.

  This steam supply operation is performed for a predetermined time (from 30 minutes to 1 hour) (steps S8 and S9). When the predetermined time has elapsed, the operation of the steam heater 29 and the pump 31 is stopped, and the alarm 48 is operated for a predetermined time to notify that the cooking chamber 3 can be cleaned (wiped off). (Steps S10 and S11).

  Thereafter, it is determined whether or not the door 4 has been opened from the detection result of the opening and closing of the door 4 by the door switch 47 (step S12). It is determined whether or not the predetermined time has passed (step S13). When it is determined that the predetermined time has passed (YES), it is determined whether or not the door 4 is closed (step S14). ). Normally, cleaning is performed to wipe off dirt adhering to the wall surface of the cooking chamber 3 after the door 4 is opened and closed.

  Here, a ceramic plate such as the bottom plate 6 and the rear plate 7 constituting a part of the cooking chamber 3 is generally formed with a glassy film made of silicate on the surface. However, if it remains as it is, it becomes difficult for heat sticking to enter the surface cracks. In this regard, as in this embodiment, the surface 35 is formed by providing a coating 35 containing silicon oxide and zirconium oxide on the surface of the ceramic bottom plate 6 and rear plate 7 facing the cooking chamber 3. The pores such as cracks are closed and smooth, and the hydrophilicity of the surface increases. For this reason, as shown in FIG. 8, even if the dirt 55 adheres to the film 35 portion, the moisture 56 is supplied by water vapor or the like. Moisture 56 enters (see (b)), and the dirt 55 floats, and the dirt 55 can be easily removed.

  Returning to FIG. 7, if it is determined in step S <b> 14 that the door 4 is closed (YES), the ventilation fan 50 is operated for a predetermined time to take in outside air into the cooking chamber 3. Intake / exhaust for discharging the gas to the outside (step S15). Thereby, the water | moisture content in the cooking chamber 3 is discharged | emitted.

  If it is determined in step S12 that the door 4 is not opened (NO), it is determined whether or not the end notification in step S11 has been performed a predetermined number of times, for example, five times (step S16), and the predetermined number of times. If it is determined not to go (NO), for example, it is determined whether or not a predetermined time such as 2 minutes has passed (step S17), and the predetermined time is an error! The link is not correct. When it is determined (YES), the process returns to step S11 to notify the end again. If it is determined in step S16 that the end notification has been performed a predetermined number of times (YES), the process proceeds to step S15, and the cooking chamber 3 is sucked and exhausted by operating the ventilation fan 50.

According to the above embodiment, the following operational effects can be obtained.
By providing a coating 35 containing silicon oxide and zirconium oxide on the surface of the ceramic bottom plate 6 and the rear plate 7 constituting part of the cooking chamber 3 and facing the cooking chamber 3, cracks on the surface Etc., and the surface becomes more hydrophilic and the surface becomes more hydrophilic. For this reason, even if the dirt 55 adheres to the film 35 part, the moisture 56 is supplied between the dirt 55 and the film 35 due to the hydrophilic effect of the film 35 by supplying the moisture 56 with water vapor or the like. Thus, the dirt 55 can be easily removed. Thereby, it becomes possible to improve the cleanability of the bottom plate 6 and the rear plate 7, and consequently the cleanability of the cooking chamber 3.

  The film 35 is vitreous and has a very high hardness, and since it contains zirconium oxide and the like, it is difficult to peel off. The film 35 has high heat resistance and can be used at any cooking temperature of 270 ° C. or higher without any problems, and there are no problems such as peeling of the film 35 and generation of harmful gases.

  Further, since the coating 35 contains zirconium oxide or the like, the bottom plate 6 (rear plate 7) of the present embodiment provided with the coating 35 is a normal one not provided with the coating 35 as shown in FIG. The far-infrared emissivity is higher than that of the ceramic plate, and the food can be efficiently cooked by the far-infrared effect. In FIG. 9, the emissivity on the vertical axis is 100% for a black body.

  The coating 35 contains an alkaline earth metal compound and water. By adopting such a configuration, fine pores having a molecular diameter level generated in the coating 35 are also blocked. Thereby, the surface of the film | membrane 35 becomes smoother, and it can prevent that the attached dirt penetrate | infiltrate to the inside of the film | membrane 35. FIG. Moreover, since the affinity with water is further increased, the attached dirt is more easily peeled off. In addition, since the affinity with the glass layer on the surface of the ceramics that is the base material is also increased, the adhesion of the coating 35 is improved, and it becomes possible to maintain the improvement of the cleaning property over a long period of time.

  Here, the effect of the cleaning property will be described with reference to FIG. In order to confirm the effect of the cleaning property of the present invention, the following test was performed. Various seasonings and foods that may adhere in the microwave oven are applied to the surface of the ceramic plate (this example) provided with the coating 35 and the surface of a general ceramic plate (comparative example) not provided with the coating 35. After applying to the surface and heating at 300 ° C for 60 minutes, the moisture was supplied by steam operation (20 minutes) in the oven, and then wiped with a damp cloth. . The result is shown in FIG. From this result, it is apparent that the cleaning property is improved in the case of the present embodiment as compared with the comparative example.

  Since the coating film 35 is not provided on the portion where the adhesive 36 is attached to the bottom plate 6 and the rear plate 7, as described above, it is possible to prevent the adhesive strength from being lowered by the adhesive 36. In addition, by adding a colorable pigment that decomposes and flies when heated to dryness in the coating material for film formation, the place where the coating material is applied when applied to the bottom plate 6 can be easily understood. Even if it adheres to a place other than necessary, it can be easily understood.

  Since the water vapor supply device 27 capable of supplying water vapor into the cooking chamber 3 is provided, dirt can be removed by supplying water vapor into the cooking chamber 3 by the water vapor supply device 27 in the cleaning mode. It can be made easier and the cleaning property can be improved.

  During the cleaning mode, the steam supply device 27 is operated when the temperature in the cooking chamber 3 (and thus the temperature of the bottom plate 6 and the rear plate 7) is a predetermined temperature of 60 ° C. or lower. Condensation is likely to occur on the inner surface of 3, and dirt can be easily removed.

  Further, since the coating 35 is provided over the entire front surface of the rear wall 2a of the inner box 2, the far-infrared radiation effect of the coating 35 can make the temperature in the cooking chamber 3 uniform. Become. Moreover, the cleanability of the part exposed in the cooking chamber 3 from the opening 25 of the rear plate 7 on the front surface of the rear wall 2a of the inner box 2 can be improved.

The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows.
The bottom plate 6 and the rear plate 7 are exemplified by ceramic plates as heat resistant plates, but heat resistant glass plates may be used.
The means for supplying moisture to the inner surface of the cooking chamber 3 at the time of cleaning is not limited to the water vapor supplied by the water vapor supply device 27, and mist may be supplied.

The vertical side view of the microwave oven which shows one Example of this invention View of the cooking room from the front Partial longitudinal front view showing the steam supply unit An exploded perspective view showing how to attach the bottom plate (A) is a longitudinal sectional view showing the mounting state of the bottom plate in the present embodiment, (b) is a view equivalent to (a) showing a comparative example. Block diagram showing electrical configuration Flow chart showing control contents in cleaning mode (A) is sectional drawing which shows the state where the water | moisture content was given to the dirt adhering to the surface of the film | membrane of a baseplate, (b) is a partial expanded sectional view of (a). Characteristics chart comparing far infrared radiation efficiency Figure showing the cleanability test results

Explanation of symbols

  In the drawings, 2 is an inner box, 3 is a cooking chamber, 4 is a door, 6 is a bottom plate (heat resistant plate), 7 is a rear plate (heat resistant plate), 9 is a magnetron (heating means), 15 is a lower heater (heating) Means), 16 is an upper heater (heating means), 18 is a hot air supply device (heating means), 27 is a water vapor supply device (water vapor supply means), 35 is a film, and 36 is an adhesive.

Claims (6)

A cooking chamber in which at least one surface is formed of a heat-resistant plate made of an inorganic material, and an object to be cooked is housed therein;
Heating means for heating the cooking object accommodated in the cooking chamber,
A heating cooker characterized in that a film containing silicon oxide and zirconium oxide is provided on a surface of the heat-resistant plate facing the cooking chamber.   The cooking device according to claim 1, wherein the film contains an alkaline earth metal compound and water.   The cooking device according to claim 1 or 2, wherein the coating is not provided on a portion of the heat resistant plate to which an adhesive is applied.   The heating cooker according to any one of claims 1 to 3, wherein the paint forming the film is colored with a pigment that decomposes by heating and becomes colorless.   The cooking device according to any one of claims 1 to 4, further comprising a steam supply means capable of supplying steam to the cooking chamber.   The cooking device according to claim 5, wherein the steam supply means is operated when the temperature of the heat-resistant plate is equal to or lower than a predetermined temperature.

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