JP2017220387A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker in which an internal capacity inside a cooking chamber can be increased while a reduction of a product in size is being achieved.SOLUTION: On a peripheral portion of a door 3, a frame-like ridge 144 attenuating radio waves from a cooking chamber 14 is provided. The ridge 144 has a recess-shaped choke groove 148 and a conductor piece 152 extending at an opening side of the choke groove 148 and being periodically arranged. Within a rang where a radio wave leak amount from the cooking chamber 14 is equal to an evaluation reference value or less, an overhanging surface portion 156 of the conductor piece 152 facing an oven front plate 12 and having a width dimension d2 different from those of an upper side portion 144a, a lower side portion 144b, a left side portion 144c, and right side portion 144d of the ridge 144 is formed. On this account, a width dimension d4 of the oven front plate 12 facing the upper side portion 144a can be narrower than width dimensions d4 of the oven front plate 12 facing the lower side portion 144b, the left side portion 144c, and the right side portion 144d.SELECTED DRAWING: Figure 30

Description

  The present invention relates to a heating cooker that heats an object to be cooked placed in a cooking chamber.

  As this type of heating cooker, for example, Patent Document 1 includes a rectangular box-shaped cooking chamber for storing an object to be cooked inside a main body, and the front opening of the cooking chamber is opened and closed with a rotatable door. The center where the cooking object in the cooking chamber is usually arranged by directing the microwave reflected on the ceiling wall inward by forming the ceiling wall inside the cooking chamber into a dome-shaped dome shape Microwave ovens have been proposed that concentrate in the area and effectively perform the heating action of the object to be cooked.

  In another patent document 2, a nano-ceramic coating film mainly composed of fine powder of an inorganic component having a particle size of 1000 nm or less is formed on the inner surface of a cooking chamber that accommodates an object to be cooked. The applicant has already proposed a microwave oven that improves the cleanability.

  In Patent Document 3, as a cooling structure inside the main body, a single cooling fan is disposed in the outdoor lower space of the cooking chamber, and the cooling air from the blower fan is disposed in the same outdoor lower space. A microwave oven has been proposed that blows air to the control board and magnetron of the apparatus, guides it to the outdoor space of the cooking chamber by a blower duct, and blows it to an infrared sensor and door lock mechanism provided in the outdoor space. .

Japanese Patent No. 5197236 Japanese Patent No. 5879755 JP 2013-79744 A

  The cooking device such as the microwave oven disclosed in Patent Documents 1 and 2 has a replacement rate of products reaching 90% or more, but it is not possible to purchase a new product unless it can be placed in the current location. . For this reason, there is a current situation that the outer shape of the main body, which is the outer shell of the product, cannot be increased unnecessarily to promote replacement. On the other hand, the capacity of the cooking chamber is required to be as large as possible so that, for example, a large plate can be placed as it is and cooking can be performed. There was a need for a way to make it bigger.

  Moreover, in the heating cooker disclosed by patent document 2, although the burning and dirt which adhered to the inner surface of the cooking chamber can be easily wiped off with the coating film of the nano ceramics, the bent four corners of the inner surface of the cooking chamber In the corners with the back wall, it is difficult to remove scorch and dirt, and further improvement in cleanability has been demanded.

  Furthermore, if the internal capacity of the cooking chamber is to be increased as much as possible without increasing the outer shape of the main body, the outdoor space of the cooking chamber inside the main body inevitably decreases in volume. Therefore, as in Patent Document 3, it becomes difficult to guide the cooling air from the outdoor lower space of the cooking chamber to the outdoor outer space using the air duct, and it is necessary to fundamentally review the cooling structure inside the main body. It was.

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a heating cooker that can increase the internal capacity of a cooking chamber while reducing the product size.

  Moreover, the 2nd objective of this invention is to provide the heating cooker which can further improve the cleanability of the inner surface of a cooking chamber.

  The third object of the present invention is to provide a heating cooker that can efficiently blow cooling air into an outdoor space of a cooking chamber that is limited inside the main body.

  The present invention consists of a main body provided with a cooking chamber for containing the food to be cooked, and a door provided on the front surface of the main body and opening and closing the front opening of the cooking chamber. A frame-like choke structure for attenuating radio waves from a cooking chamber is provided, and the choke structure includes a concave radio wave attenuating groove and a conductor that is periodically arranged to extend to the opening side of the radio wave attenuating groove And an opposing portion of the conductor piece facing the front surface of the main body is separated from one side of the choke structure in a range where the amount of radio wave leakage from the cooking chamber is a reference value or less. They are formed in different width dimensions on the sides.

  Further, the present invention provides a cooking device for cooking the food to be cooked in the cooking chamber by a heating means, wherein the ceiling wall on the inner surface of the cooking chamber is formed in a dome shape, and the corner of the inner surface of the cooking chamber is formed. The part is formed in an R shape having a radius of 10 mm or more.

  In each of the above inventions, it is preferable that a rib protruding outward is provided on the outer surface of the main body.

  Moreover, the 1st ventilation fan and the 2nd ventilation fan are each arrange | positioned in the outdoor lower part space and outdoor part space of the said cooking chamber in the said main body, and the cooling air from the said 1st ventilation fan is arrange | positioned in the said outdoor lower part It is preferable that the first heat generating unit disposed in the space be blown and the cooling air from the second blower fan be blown to the second heat generating unit disposed in the outdoor side space.

  According to the invention of claim 1, within the range where the amount of radio wave leakage from the cooking chamber is equal to or less than the reference value, the width dimension of the facing portion of the conductor piece is the same on each side of the choke structure formed in a frame shape. Instead, for example, by making the width dimension of one side shorter than the width dimension of another side, the width of the front surface of the main body facing one side is made smaller than the width of the front surface of the main body facing the other side. Thus, it becomes possible to increase the capacity of the cooking chamber without changing the external dimensions of the main body.

  According to the second aspect of the present invention, the corner of the inner surface of the cooking chamber is not squared, and the radius is 10 mm or more, so that the cloth can easily reach the corner during cleaning, and the fingertip is used. Thus, scorch and dirt adhering to the corners can be easily removed, and the cleanability of the inner surface of the cooking chamber can be further improved. Moreover, not only the ceiling wall constituting the inner surface of the cooking chamber, but also the corners are rounded so that the hot air supplied from the heating chamber inside the cooking chamber can be improved. The uneven baking can be effectively improved.

  According to the invention of claim 3, when the cooking device is installed at an arbitrary place, a predetermined space is secured between the main body and the installation wall surface at least by the amount of protrusion of the rib. It becomes possible to reliably prevent the accumulation of heat from the heating cooker.

  According to the invention of claim 4, in the main body, the first heat generating portion disposed in the outdoor lower space of the cooking chamber and the second heat generating portion disposed in the outdoor outer space of the cooking chamber are separately provided. By cooling with the 1st ventilation fan and the 2nd ventilation fan, it becomes unnecessary to guide cooling air from the outdoor lower space of the cooking chamber to the outdoor side space. Therefore, it becomes possible to efficiently blow cooling air into the outdoor space of the cooking chamber that is limited inside the main body.

It is an external appearance perspective view of the microwave oven which shows 1st embodiment of this invention. It is the figure seen from the front front when opening a door same as the above. It is the longitudinal cross-sectional view seen from the side same as the above. It is the figure seen from the back of the rear surface in the state which removed the cabinet and the oven back plate same as the above. It is a front view of the main body of the state which removed the cabinet same as the above. It is a rear view which shows a hot-air unit and a transmission mechanism same as the above. It is a principal part front view of the hot air unit removed from the back wall of the cooking chamber same as the above. It is a figure which shows the positional relationship of a cooking chamber and a heating chamber same as the above. FIG. 3 is a front view of the oven front plate alone. It is a figure which shows the internal structure of a cooking chamber, and the flow of a hot air same as the above. It is an enlarged view which shows the state before wiping off the inside of a cooking chamber same as the above. It is a figure which shows the internal structure of a cooking chamber, and the radiation | emission direction of a far infrared ray same as the above. FIG. 2 is a longitudinal cross-sectional view of the main part of the microwave generator and its periphery as seen from the side. It is the figure which looked at the cooking chamber of the state which removed the bottom plate same as the above from the front. It is a top view of an antenna same as the above. It is a principal part right view of the state which closed the door completely and removed the cabinet from the main body same as the above. FIG. 3 is a right side view of the main part with the door slightly opened and the cabinet removed from the main body. It is the figure seen from the front front when a door was opened in order to demonstrate the illumination means in a cooking chamber same as the above. It is a main part longitudinal cross-sectional view of an internal temperature distribution detection means and its periphery same as the above. It is the figure which looked at the detection element of the 1st sensor from the front direction same as the above. It is the figure which looked at the detection element of the 2nd sensor from the front direction same as the above. It is a perspective view which shows the internal structure of a microwave oven same as the above, and the visual field of a 1st sensor. It is a perspective view which shows the internal structure of a microwave oven, the visual field of a 1st sensor, and a moving direction same as the above. It is a perspective view which shows the internal structure of a microwave oven same as the above, and the visual field of a 1st sensor and a 2nd sensor. It is a back view of the chalk structure seen from the back of a door same as the above. It is the principal part enlarged view which looked at the L1 part of FIG. 25 from the arrow direction. It is the principal part enlarged view which looked at the L2 part of FIG. 25 from the arrow direction. It is the principal part enlarged view which looked at the L3 part of FIG. 25 from the arrow direction. It is the principal part enlarged view which looked at the L4 part of FIG. 25 from the arrow direction. It is explanatory drawing which shows the comparison of the dimensional relationship of each part in a conventional product and this embodiment. It is the graph which measured the amount of electromagnetic wave leakage from a microwave oven in a conventional product and this embodiment. It is a bottom view of a main part in the state where a cabinet, an oven bottom plate, etc. were removed regarding a microwave oven of this embodiment. It is the figure seen from the right side of the state which removed the cabinet same as the above. FIG. 3 is a right side view of the main body with the cabinet and the like removed. It is a rear view of a cabinet same as the above. It is a right view of a cabinet same as the above. It is a left view of a cabinet same as the above. It is a block diagram which shows the main electrical structures same as the above.

  Hereinafter, preferred embodiments of a heating cooker according to the present invention will be described with reference to the accompanying drawings. Throughout these drawings, common parts are denoted by common reference numerals.

  FIGS. 1-38 has shown one Embodiment which applied the heating cooker of this invention to the microwave oven. First, the overall configuration of the microwave oven will be described with reference to FIGS. 1 to 6. Reference numeral 1 denotes a main body configured in a substantially rectangular box shape. The main body 1 is a metal that covers the outer shell of the microwave oven as a product. A cabinet 2 made of metal is provided. Reference numeral 3 denotes an openable / closable door provided on the front surface of the main body 1.

  The upper part of the door 3 is provided with an opening / closing operation handle 4 that is used to open and close the vertically opened door 3. The lower part of the door 3 has an operation panel unit 5 for display, notification, and operation. It has. The operation panel unit 5 is provided with operation means 7 that enables various operation inputs related to cooking, in addition to the display means 6 that displays the setting contents and progress of cooking. Although not shown, an operation panel PC (printed circuit) board is arranged on the rear side of the operation panel unit 5 inside the door 3 in order to control the display means 6 and the operation means 7.

  A water supply cassette 8 and a water receiver 9 that can be attached and detached from the front surface of the main body 1 are disposed below the main body 1. The water supply cassette 8 is a bottomed container for containing water as a liquid as a supply source of steam generated from a steam generator (not shown). The water receiver 9 is a bottomed container that receives food waste, water droplets, steam and the like from the main body 1.

  The cabinet 2 that forms the left and right side surfaces and the top surface of the main body 1 includes an oven front plate 12 that forms the front surface of the main body 1 and a rear surface of the main body 1 so as to cover the main body 1 and thus the oven bottom plate 11 that forms the bottom surface of the microwave oven. It is provided between the oven back plate 13 to be formed. Further, the main body 1 is provided with a cooking chamber 14 that accommodates an object to be cooked S to be cooked, and a thermistor 15 that is a temperature detection element that detects the temperature of the cooking chamber 14. The front surface of the cooking chamber 14 reaches the oven front plate 12, and is opened to take in and out the cooking object S. The opening is opened and closed by the door 3.

  The peripheral wall forming the cooking chamber 14 includes a ceiling wall 14a, a bottom wall 14b, a left side wall 14c, a right side wall 14d, and a back wall 14e. The back wall 14 e of the cooking chamber 14 includes a suction port 16 at the center thereof, and a plurality of hot air outlets 17 around the suction port 16. In addition, an upper heater 18 for the grill that radiates and heats the cooking object S from above the cooking chamber 14 is provided on the upper portion of the main body 1 so as to face the dome-shaped ceiling wall 14a that is the upper wall surface of the cooking chamber 14. In addition, a microwave generator 19 including a magnetron 64 (see FIG. 32) is provided at the bottom of the main body 1 in order to supply microwaves that are radio waves into the cooking chamber 14. Thereby, the cooking object S accommodated in the cooking chamber 14 is heated by grilling from the upper direction by the heat radiation accompanying the energization of the upper heater 18, and the cooking chamber 14 is energized by the energizing operation to the microwave generator 19. The to-be-cooked object S accommodated in is radiated with microwaves and the to-be-cooked object S is subjected to range heating.

  The left side wall 14c and the right side wall 14d of the cooking chamber 14 are provided with a pair of left and right shelf supports 22 in two upper and lower stages in order to store and hold a metal square plate 21 in the cooking chamber 14 in a suspended state. Yes. The square plate 21 used here has a bottomed concave shape with an open upper surface, and the other includes a housing portion 21A formed without holes and a flange portion 21B extending in the horizontal direction outside the upper end of the housing portion 21A. Is done. The flange portion 21B is formed with a vent hole 21C that allows hot air to flow through the square plate 21. FIG. 2 shows a state in which the flange portion 21B of the square plate 21 is placed on the lower shelf support 22 inside the cooking chamber 14, and the cooking object S is placed on the accommodating portion 21A. The plate 21 may be placed only on the upper shelf support 22, or the two square plates 21 may be placed on the upper and lower shelf supports 22, respectively. ) Etc. can also be stored and held.

  Reference numeral 24 denotes a hot air unit for heating the oven that is provided in the main body 1 from the outdoor rear to the lower side of the cooking chamber 14. The hot air unit 24 includes a convex casing 26 attached to the back wall 14e, a hot air heater 27 for heating air, a hot air fan 28 for sending and circulating the heated air into the cooking chamber 14, and a hot air fan 28. An electric hot air motor 29 that rotates in a predetermined direction and a transmission mechanism 30 that transmits the driving force from the hot air motor 29 to the hot air fan 28 are generally configured. As an internal space between the back wall 14e and the casing 26, a hot air heater 27 and a hot air fan 28 are respectively disposed in a heating chamber 31 formed on the rear rear side of the cooking chamber 14, while the interior of the main body 1 is provided. A hot air motor 29 is disposed in the outdoor lower space 32 formed between the cooking chamber 14 and the oven bottom plate 11. And the oven back board 13 is arrange | positioned in the rear part of the main body 1 so that the whole hot air unit 24 may be covered from the back side outer side.

  The hot air fan 28 of the present embodiment is provided as a so-called centrifugal fan that discharges air taken in the axial direction in a radial direction perpendicular to the axial direction by centrifugal force during rotation, and the tubular hot air heater 27 is a hot air fan. 28 are disposed around the radial direction. For example, a sheathed heater, a mica heater, a quartz tube heater, or a halogen heater is used as the hot air heater 27 that is also a heat generating portion. The suction port 16 and the hot air outlet 17 described above function as a ventilation unit that allows the cooking chamber 14 and the heating chamber 31 to communicate with each other.

  In the present embodiment, when the hot air fan 28 is rotationally driven along with the energization of the hot air motor 29, the air sucked from the inside of the cooking chamber 14 through the suction port 16 is blown in the radial direction of the hot air fan 28 and energized. Heated by the hot air heater 27, passes through the hot air outlet 17, and hot air is supplied into the cooking chamber 14. Thereby, the path | route which circulates a hot air inside and outside the cooking chamber 14 is formed, and the to-be-cooked object S in the cooking chamber 14 is heated with a hot air convection. Further, the left side wall 14c of the cooking chamber 14 is provided with a steam ejection hole 33 communicating with the steam generator. Although not shown, the steam generator provided inside the main body 1 is a metal-made hollow evaporation container, an evaporation heater such as a sheathed heater attached to the evaporation container, or water from the water supply cassette 8 in the evaporation container. And a plurality of vapor ejection holes 33 communicating with the inside of the evaporation container. As a result, during operation of the steam generator, water from the water supply cassette 8 is fed into the evaporation container and heated to a predetermined temperature, so that saturated steam or superheated steam enters the cooking chamber 14 from the steam ejection hole 33. Is supplied, and steam cooking of the cooking object S put in the cooking chamber 14 is performed.

  The hot air fan 28 is configured by arranging a plurality of blades 35 radially around the shaft 34 around a shaft 34 serving as a rotation axis thereof. The base end of the shaft 34 protrudes outward from the heating chamber 31 toward the rear of the main body 1, and a driven pulley 36B is attached and fixed thereto. In the hot air motor 29, a pulley 36A on the main drive side is attached and fixed to a rotatable motor shaft 37 protruding toward the rear of the main body 1. An endless belt 38 is suspended between the pulleys 36A and 36B, and a transmission mechanism 30 including the pulleys 36A and 36B and the belt 38 connects the hot air fan 28 and the hot air motor 29. Although not shown, the cross section of the belt 38 can have various shapes such as a rectangular shape and a trapezoidal shape.

  In addition, the transmission mechanism 30 includes a support body 41 for pivotally supporting the shaft 34 of the hot air fan 28 at a predetermined position. The support 41 surrounds the side portion of the belt 38 and is fixedly attached to the rear outer surface of the casing 26. The case member 42 through which the shaft 34 of the hot air fan 28 and the motor shaft 37 of the hot air motor 29 are inserted, and the shaft 34 rotate. In order to support it, it is constituted by a holder member 43 that partially covers the pulley 36B and is fixedly attached to the case member 42. In particular, the case member 42 of this embodiment integrally forms a leg portion 44 extending downward from the bottom wall 14 b of the cooking chamber 14, and the bottom surface of the leg portion 44 is placed on the oven bottom plate 11 of the main body 1. By supporting the rear part of the cooking chamber 14 with the legs 44, a lower space 32 that is large enough to accommodate the hot air motor 29 is formed between the cooking chamber 14 and the oven bottom plate 11. The case member 42 is provided with a non-contact detection sensor 45 disposed in the vicinity of the pulley 36A in order to detect the rotational speed of the hot air fan 28.

  As shown in FIG. 4, the shaft 34 of the hot air fan 28 is arranged at the approximate center of the back wall 14 e of the cooking chamber 14 by the transmission mechanism 30, while the hot air motor 29 and its motor shaft 37 are connected to the cooking chamber 14. The case member 42 is arranged along a straight line connecting the shaft 34 and the motor shaft 37 so as to be disposed on the lower side of the bottom wall 14 b serving as the bottom wall surface. As described above, the hot air fan 28 and the hot air motor 29 are provided at positions separated from each other inside the main body 1, but the rotation from the hot air motor 29 is performed by the transmission mechanism 30 in which the pulleys 36 </ b> A and 36 </ b> B and the belt 38 are combined. The driving force can be smoothly transmitted to the hot air fan 28. Moreover, the thermal effect from the cooking chamber 14 can be prevented by sufficiently separating the hot air motor 29 from the cooking chamber 14.

  In addition, the vertically open door 3 that covers the opening of the cooking chamber 14 is rotatable at the front lower portion of the main body 1 by a pair of left and right movable hinge mechanisms 46 provided in the main body 1 through the oven front plate 12. Supported. In addition, in order to allow the inside of the cooking chamber 14 to be visually recognized when the door 3 is closed, an interior panel 48 serving as a transparent window member such as glass is arranged inside the door member 47 that forms the outline of the door 3. Established.

  Next, a detailed configuration of the microwave oven will be described with reference to FIGS. First, the configuration relating to the hot air unit 24 will be described with reference to FIGS. 7 and 8. In each of these drawings, the hot air heater 27 includes a nichrome wire (not shown) as a heating element inside a metal heat radiating pipe 51. Disc-shaped fins 52 are arranged on the outer peripheral surface of the heat radiating pipe 51 at predetermined intervals. Thereby, in the inside of the heating chamber 31, the wind discharged from the rotating hot air fan 28 is sprayed on the fin 52, and it is the structure efficiently made into hot air.

  The casing 26 is provided with a heater mounting portion 53 through which the hot air heater 27 is inserted in a sealed state inside and outside the heating chamber 31. The heater mounting portion 53 is disposed not on the side of the heating chamber 31 but on the lower side so that the width Wk of the heating chamber 31 can be easily expanded to approach the width Wm of the cooking chamber 14. Although not shown in these drawings, the back wall 14e of the cooking chamber 14 is provided with a suction port 16 at a position facing the hot air fan 28 and located in the radial direction of the hot air fan 28, A plurality of hot air outlets 17 are arranged.

  In particular, in the present embodiment, the heating chamber 31 is expanded to the left and right as much as possible so that the width dimension Wk of the heating chamber 31 is close to the width dimension Wm of the cooking chamber 14, and outside the hot air heater 27 as viewed from the center of the hot air fan 28. On the other hand, the hot air outlet 17 is provided near the left and right ends of the heating chamber 31. As a result, the hot air generated by the hot air unit 24 spreads from the hot air outlet 17 to both corners of the cooking chamber 14 and is sent to a wide area without rotating the hot air fan 28 in the forward and reverse directions, thereby realizing uniform oven heating. it can. Note that both end portions of the hot air heater 27 are drawn out of the heating chamber 31 for energization and connected to other electrical components.

  FIG. 9 shows the oven front plate 12, and FIG. 10 shows the inner surface structure of the cooking chamber 14 and the flow of hot air. In each of these drawings, in the present embodiment, the ceiling wall 14a of the cooking chamber 14 is formed in a dome shape that is convex upward. Further, the bent four corners 55 of the inner surface of the cooking chamber 14, that is, a part connecting the bottom wall 14b and the left wall 14c, a part connecting the left wall 14c and the ceiling wall 14a, and the ceiling wall 14a and the right wall 14d. The inner surface of the connecting portion and the inner portion of the portion connecting the right side wall 14d and the bottom wall 14b are all formed in an R shape, and the corner portion 56 between the inner wall 14e on the inner surface of the cooking chamber 14 and the other wall, that is, the ceiling wall 14a. The bottom wall 14b, the left side wall 14c, the right side wall 14d, and the inner surface of the portion connecting the back wall 14e are all formed in an R shape.

  Thus, by combining the round ceiling wall 14a and the four corners 55 and the corners 56 that are round corners, the inner surface of the cooking chamber 14 is formed in a round shape. The hot air blown from 17 wraps around the back wall 14e without hitting in the vicinity of the corner 56, or directly without going along the back wall 14e, the ceiling wall 14a, the bottom wall 14b, the left side wall, etc. 14c and the hot air flowing along the right side wall 14d and flowing along the round ceiling wall 14a wrap around the left side wall 14c and the right side wall 14d without hitting the four corners 55, and also on the bottom wall 14b side facing the ceiling wall 14a. The hot air flowing along the substantially linear bottom wall 14b flows around the left side wall 14c and the right side wall 14d and almost flows into the central part without almost hitting the four corners 55. Therefore, hot air convects the entire interior of the cooking chamber 14 and heat circulation is improved. In FIG. 10, the hot air flow F around the four corners 55 during operation of the hot air unit 24 is indicated by arrows.

  In addition, the four corners 55 here are formed with a chamfer dimension of radius R = 15 mm (that is, R15). However, the four corners 55 and the corners 56 are formed so that the inner surface of the cooking chamber 14 can be wiped off with a fingertip. The chamfer dimensions are preferably R10 or more.

  FIG. 11 shows a state before and after wiping the inner surface of the cooking chamber 14. In the present embodiment, all the walls 14a to 14e forming the inner surface of the cooking chamber 14 have a particle diameter of 1000 nm over the entire surface of the base material 58 made of a metal plate material, including the four corner portions 55 and the corner portions 56 described above. It is comprised by covering with the coating film 60 which mainly comprised the particle | grains 59 of the inorganic component which are the following. The particles 59 are made of fine ceramic particles such as alumina, for example, and are filled with a particle size and density such that scorching and dirt K adhering to the surface of the coating film 60 do not enter the coating film 60. As a result, scorching and dirt K adhering to the inner surface of the cooking chamber 14 cannot enter the nanoceramic coating 60 mainly composed of the fine particles 59 and can be easily wiped off with a cloth or the like. Therefore, the inner surface of the cooking chamber 14 can be kept clean after wiping.

  The hot air unit 24 of the present embodiment has a configuration for supplying hot air of 350 ° C. at the maximum into the cooking chamber 14 during its operation. Therefore, as shown in FIG. 12, in combination with the coating of the inner surface of the cooking chamber 14 with the ceramic coating film 60, far infrared rays R are effectively emitted from the entire inner surface of the cooking chamber 14 except for the door 3. Can radiate. Then, by combining the radiation of the far-infrared ray R and the convection of the hot air F described above, the heating time until the temperature in the cooking chamber 14 reaches 200 ° C. is reduced to about 5 minutes, for example, when preheating the oven heating. In addition to being able to speed up, it is possible to suppress baking unevenness with respect to the cooking object S in the cooking chamber 14 and to bake it cleanly.

  Further, as shown in FIG. 2, a slit-shaped air hole 21 </ b> C is provided around the square plate 21. Therefore, for example, when each of the square dishes 21 is placed on the upper and lower shelf supports 22 and the oven heating cooking using the hot air unit 24 is performed, the hot air is heated in the cooking chamber 14 through the vent holes 21C of the square dishes 21. As F circulates up and down, far-infrared rays R are radiated from the entire inner surface of the cooking chamber 14, and the food to be cooked S can be wrapped with hot air F and far-infrared rays R from the front, rear, left and right, and baked.

  Next, the detailed configuration of the microwave generator 19 and its surroundings will be described with reference to FIGS. In each of these drawings, the bottom wall 14b of the cooking chamber 14 is configured by covering the upper surface opening of the concave antenna housing portion 62 formed in the metal plate 61 with a bottom plate 63 that can transmit microwaves such as a ceramic plate. Is done. The metal plate 61 that cannot transmit microwaves integrally forms not only the peripheral portion of the bottom wall 14 b but also the left side wall 14 c, the right side wall 14 d, and the back wall 14 e, and the cooking chamber 14 excluding the bottom plate 63. The inner surface of is made of a material that cannot transmit microwaves.

  The microwave generator 19 guides the microwaves oscillated by the magnetron 64 in the lower space 32 inside the main body 1 directly below the antenna housing 62 in addition to the magnetron 64 serving as a radio wave, that is, a microwave supply source. A tube 65, an antenna motor 66 disposed below the waveguide 65, an antenna holder 67 having a lower end portion disposed inside the waveguide 65, and attached and fixed to the rotation shaft of the antenna motor 66; A cylindrical cable shaft 68 that is inserted and fixed in the antenna holder 67 and an antenna 69 that is fixedly attached to the upper end of the cable shaft 68 at the center and is rotatably provided inside the antenna housing portion 62. Configured. In a state where the top opening of the antenna storage portion 62 is closed with the bottom plate 63, the entire antenna 69 is disposed in parallel with the bottom plate 63 so as to face the flat bottom plate 63 forming the bottom wall 14 b of the cooking chamber 14. The

  The antenna 69 radiates microwaves traveling from bottom to top along the cable axis 68 from the surface. In this embodiment, the contour shape seen from above is a circular shape with a part cut away, and has a constant thickness. It is formed of a flat metal plate such as aluminum having no unevenness. The antenna 69 has a through-hole 71 into which the upper end portion of the cable shaft 68 is inserted, a notch-shaped microwave radiating portion 72 having an outer peripheral portion opened, and radiation adjusting portions 73 and 74 having two large and small openings. It is formed. The microwave radiation part 72 gives directivity in the direction of arrow D shown in FIG. 15 to the radiation of the microwave. On the inner surface of the microwave radiating portion 72, a radiation projecting portion 75 projecting linearly and a pair of radiation projecting portions 76 projecting in an arc shape along the outer peripheral shape of the antenna 69 are disposed. Microwaves are emitted strongly from 75 and 76. The radiation adjustment units 73 and 74 are for adjusting the microwave from the antenna 69 to a target radiation distribution. Here, the radiation adjustment units 73 and 74 are particularly micros which vary according to the distance from the cable shaft 68 to the end of the antenna 69. It adjusts the radiation distribution of waves.

  The disk-shaped antenna 69 used here rotates around the cable shaft 68 below the bottom plate 63 by energizing the antenna motor 66. However, moving the large disk moves the radio wave more than moving the small disk. Since the area which stirs increases, it becomes advantageous in suppressing the heating nonuniformity to the to-be-cooked object S put into the cooking chamber 14. FIG. Moreover, the place near the inner wall surface of the cooking chamber 14 has a feature that the change of radio waves is small and it is difficult to warm. Therefore, in order to more effectively suppress the heating unevenness to the cooking object S than the conventional one, the diameter Ar of the antenna 69 is preferably set to 20 cm or more.

  As shown in FIG. 14, when the gap Ad between the outer peripheral end surface of the antenna 69 and the side surface of the antenna housing portion 62 is about 3 mm or less, a spark is generated due to electric field concentration between metals. Therefore, it is preferable that the distance Ad between the antenna 69 and the other metal, for example, the antenna housing portion 62 is designed to be 10 mm or more apart.

  Next, the structure regarding the opening / closing mechanism of the door 3 will be described with reference to FIGS. 16 and 17. In the same figure, 46 is a hinge mechanism which connects the door 3 and the main body 1 so as to keep the door 3 open and closed. The hinge mechanism 46 includes a first arm 83 and a second arm 84 that extend forward from the main body 1 through the oven front plate 12 to door hinges (not shown) that are fixedly attached to the lower left and right sides of the door 3. Concatenated to each other. The hinge mechanism 46 includes a spring 85 as an elastic body that applies a brake when the door 3 is opened, a resin roller 86, a metal plate-like roller holder 87 that rotatably holds the roller 86, and the door 3. An oil damper 88 is provided inside the main body 1 for applying braking when is closed.

  The second arm 84 is formed integrally with the roller holder 87, and its tip is pivotally supported by a hinge shaft 90 provided on the door hinge. As a result, when the handle 4 is grasped and the upper portion of the door 3 is pulled and tilted forward, the door 3 is moved around the hinge shaft 90, and the cooking object S can be taken in and out of the heating chamber 14 through the opening of the heating chamber 14. It is like that.

  The tip of the first arm 83 is rotatably supported by an arm pin 91 provided on the door hinge. An extendable spring 85 is connected between the base end of the first arm 83 and the roller holder 87 attached and fixed to the oven bottom plate 11 of the main body 1. The spring 85 urges the door 3 to close the door 3 via the first arm 85 when the door 3 is opened and closed, and urges the first arm 83 so as not to drop off the roller 86. The lower surface of the first arm 83 that moves in accordance with the opening and closing of the door 3 is formed as a sliding surface 92 that abuts on the roller 86, whereby the first arm 83 is supported so as to be movable in the front-rear direction on the roller 86. Is done.

  The oil damper 88 is configured by a main body cylinder 94 fixedly held by a roller holder 87 and filled with oil, and a movable body 95 that protrudes from the front end side of the main body cylinder 94 and protrudes and appears against an elastic repulsive force of oil. Is done. In the middle of closing the door 3 shown in FIG. 17, when the movable body 95 comes into contact with the receiving piece 96 of the first arm 83 and the door 3 is further closed to the main body 1 side, the elasticity from the oil damper 88 is obtained. An oil damper 88 is disposed at a position where the repulsive force acts on the door 3 via the first arm 83.

  A concave portion 97 is formed on the sliding surface 92 of the first arm 83 at a position where it comes into contact with the roller 86 when the door 3 shown in FIG. The recess 97 serves to position the door 3 with respect to the oven front plate 12 when the door 3 is closed. The first arm 83 is integrally formed with a projecting piece 98 on the surface opposite to the sliding surface 58. The projecting piece 98 is fitted with a stopper piece 99 provided inside the main body 1 when the door 3 is opened, and holds the door 3 in a fully opened state at that position.

  In this embodiment, even when the hand 3 is released before the door 3 is completely closed, when the movable body 95 of the oil damper 88 comes into contact with the receiving piece 96 of the first arm 83, the oil damper 88 with respect to the door 3 from there The elastic repulsive force becomes stronger and stronger. Therefore, it is possible to bring the concave portion 97 of the first metal arm 83 into contact with the resin roller 86 while gradually reducing the rotation speed when closing the door 3, and the door 3 collides with the main body 1 side. Closed quietly without.

  FIG. 18 shows a preferred example regarding the illumination means in the cooking chamber 14. In the drawing, reference numerals 101a and 101b denote upper and lower two-stage interior lamps that are arranged on the outer side of the cooking chamber 14 and emit light La and Lb radially toward the inside of the cooking chamber 14 when turned on. The upper cabinet lamp 101a is provided at a position where light La is emitted toward the square plate 21 placed on the upper shelf support 22, and the lower cabinet lamp 101b is a square plate placed on the lower shelf support 22. It is provided at a position where light Lb is emitted toward 21.

  In this example, two interior lamps 101a and 101b are provided in the cooking chamber 14, and the interior lamps 101a and 101b are turned on during cooking, so that the two square dishes 21 are placed in the upper and lower stages. Even in the two-stage cooking in which the food is placed on the shelf support 22 of each of the dishes, the cooking object S accommodated in each square plate 21 is easy to see by illumination with the light La and Lb. In addition, by using the interior lamps 101a and 101b as LEDs, energy can be saved while brightly illuminating the interior of the cooking chamber 14.

  FIG. 19 shows the internal temperature distribution detection means 105 disposed in the main body 1 and the surrounding structure. On the right side wall 14 d of the cooking chamber 14, a quadrangular pyramid-shaped raised member 111 is provided so as to bulge inward toward the cooking chamber 14. The raised member 111 is located above the upper shelf support 22 and is provided at the center of the front and rear in the upper part of the right side wall 14d, and a window 112 is formed in the inclined lower surface portion. In addition, a window 113 different from the window 112 is formed in the center of the right side wall 14d in the upper and lower sides and located between the upper and lower shelf supports 22.

  Between the cooking chamber 14 and the main body 1, a first sensor 115 and a sensor motor 116 are arranged facing the outside of the raised member 111 including the window 112, and a second sensor 118 is arranged facing the window 113. Established. The sensor motor 116 and the second sensor 118 are attached and fixed inside the main body 1, while the first sensor 115 is attached to the rotatable rotating shaft 120 of the sensor motor 116.

  A sensor motor 116 serving as a driving device for the first sensor 115 is configured by a stepping motor or the like, and includes a rotation shaft 120 that swings the first sensor 115 in the front-rear direction inside the main body 1. The first sensor 115 includes a hollow sensor case 122 attached and fixed to the rotary shaft 120, a sensor substrate 123 housed in the sensor case 122, and a plurality (for example, 8) mounted on the surface of the sensor substrate 123. The main components are an infrared detection element 124 and a lens 125 that is fixed to the sensor case 122 so as to face the infrared detection element 54.

  In this embodiment, as shown in FIG. 22, the visual field V1 of each infrared detecting element 54 is arranged in the left-right direction of the bottom wall 14b having a substantially rectangular shape through the window 112 from the upper center of the right side wall 14d of the cooking chamber 14. In addition, a plurality of infrared detection elements 124 are arranged in a straight line along the vertical direction of the cooking chamber 14. Further, in this embodiment, as shown in FIG. 23, when a motor drive signal is received from a control means (not shown) and the sensor motor 116 reciprocally rotates the rotation shaft 120 by a predetermined angle in the forward direction and the reverse direction, As the one sensor 115 swings, the field of view V1 of the plurality of infrared detection elements 124 reaching the bottom wall 14b of the cooking chamber 14 is repeatedly swung in a fan shape along the moving direction X1 around each infrared detection element 124. Thus, the straight line connecting the plurality of infrared detection elements 124 indicated by the one-dot chain line in FIG. 19 and the rotation center axis of the rotation shaft 120 are substantially matched. In addition, in order to reduce the thermal influence on the inside of the main body 1, the window 112 may be closed with an infrared transmission member (not shown).

  On the other hand, the second sensor 118 includes a hollow sensor case 132 that is mounted and fixed inside the main body 1, a sensor substrate 133 that is housed inside the sensor case 132, and one piece that is mounted on the surface of the sensor substrate 133. The infrared detection element 134 and a lens 135 that is fixed to the sensor case 132 so as to face the infrared detection element 134 are main components. Then, as shown in FIG. 24, the second sensor 118 is mounted on the main body so that the field of view V2 of the infrared detection element 134 always reaches the center of the bottom wall 14b through the window 113 from the center of the right and left walls 14d. 1 is fixedly mounted inside. In addition, in order to reduce the thermal influence on the inside of the main body 1, the window 113 may be closed with an infrared transmission member (not shown).

  The first sensor 115 and the second sensor 118 are both infrared sensors, and constitute the internal temperature distribution detection means 105 of the present embodiment. The internal temperature distribution detecting means 105 here detects the temperature distribution of the entire inside of the heating chamber 14 by the swinging first sensor 115 and the fixed second sensor 118, so that the cooked food stored therein is detected. The surface temperature of the object to be cooked S is detected in a short time from the amount of infrared rays emitted from the object S.

  FIG. 25 illustrates the entire door plate 141 incorporated in the door 3. Moreover, FIGS. 26-29 is the enlarged view which looked at the L1 part-L4 part of the door plate 141 shown in FIG. 25 from the direction of the arrow, respectively. In each of these drawings, the door plate 141 made of a metal conductor is fitted inside the door member 47, and a window hole 142 for mounting the interior panel 48 is formed in the center of the door plate 141. . In addition, an opposing surface portion 143 that is closest to the front surface of the oven front plate 12 when the door 3 is closed is formed around the entire periphery of the window frame 142. A plurality of ridges 144 serving as comb-shaped choke structures are arranged in a frame shape on the periphery of the door plate 141 outside the facing surface portion 143 in order to suppress attenuation of microwaves from the cooking chamber 14. Here, the ridge 144 may be formed separately from the door plate 141 instead of being bent integrally.

  The outer peripheral portion of the door plate 141 serving as the ridge 144 is substantially perpendicular to the facing surface portion 143 and extends in a direction away from the front surface of the oven front plate 12, and is substantially perpendicular to the sidewall surface portion 145. 3 and a bottom surface portion 146 extending outwardly constitute a step portion having a substantially L-shaped cross section. The outer peripheral end of the door plate 141 is integrally provided at the outer end of the stepped portion, so that a choke groove 148 is formed in a state of circling the outer peripheral portion of the door plate 141, and the oven front plate 12 and the door plate Microwaves leaking from the gap (about 1 mm) between them are attenuated.

  The outer peripheral end portion of the door plate 141 has a plurality of conductor pieces 152 having an L-shaped cross section at predetermined intervals on a rising portion 151 that is bent from the outer end of the bottom surface portion 146 toward the front surface of the oven front plate 12. A slit-like cut portion 153 that partitions each conductor piece 152 is formed between the adjacent conductor pieces 152 and 152. Each conductor piece 152 extends from the rising portion 151 toward the front surface of the oven front plate 12, and extends to the vertical surface portion 155. The conductor piece 152 extends substantially parallel to the bottom surface portion 146 and projects to the side wall surface portion 145 side. The projecting surface portion 156 and the projecting surface portion 157 extending to the projecting surface portion 156 and projecting toward the bottom surface portion 146 are configured. The choke groove 148 corresponds to a concave radio wave attenuation groove that attenuates microwaves from the cooking chamber 14, and conductor pieces 152 extending from the rising portion 151 are periodically arranged on the opening side.

  As shown in FIG. 25, the outer shape of the ridge 144 is formed in a substantially rectangular frame shape in accordance with the outer shape of the door 3. That is, the ridge 144 here includes an upper side portion 144a, a lower side portion 144b, a left side portion 144c, and a right side portion 144d that form four straight sides. Further, in order to improve the strength of the ridge 144, which will be described later, the thickness of the material is increased from 0.5 mm to 0.6 mm, and between the upper side portion 144a and the left side portion 144c, the left side portion 144c, An R-shaped curved portion 158 connected to the rising portion 151 is formed at the corner between the lower side portion 144b, between the lower side portion 144b and the right side portion 144d, and between the right side portion 144d and the upper side portion 144a. Further, a reinforcing bead 159 is provided from the vertical surface portion 155 to the rising portion 151 of all the conductor pieces 152. The bead 159 is formed integrally with the ridge 144 and swells in a slit shape toward the inner side wall surface portion 145 so as not to impair the attenuation of the microwave from the cooking chamber 14.

  FIG. 30 shows the dimensional relationship between the ridge 144 of the door plate 141 and the oven front plate 12 described above in the conventional product and this embodiment. In the figure, d1 is an opening width dimension of the choke groove 148, that is, a dimension between the side wall surface portion 145 and the protruding surface portion 157, d2 is a width dimension of the protruding surface portion 156 of the conductor piece 152, and d3 is a choke groove. 148 is the depth dimension of the side wall surface portion 145, and d4 is the width dimension of the front upper surface or front side surface of the oven front plate 12 facing the facing surface portion 143 of the door plate 141 and the ridge 144.

  With regard to the shape of the ridge 144, in this embodiment, the dimensions d1 to d3 of the ridge 144 are formed to be 1 to 4 mm shorter than the conventional product. Thereby, the width dimension d4 of the upper surface and the side surface of the oven front plate 12 facing the ridge 144 is also shortened by 4 mm to 8 mm. Therefore, if the outer dimensions of the main body 1 are not changed between the conventional product and the present embodiment in order to avoid an increase in the size of the product, the width d4 of the upper surface and the side surface of the oven front plate 12 is shortened. The horizontal width Wm and the vertical width Wt of the cooking chamber 14 shown in FIG.

  In the conventional product, the dimensions d1 to d3 of the ridge 144 are such that the upper surface corresponding to the upper side portion 144a of the ridge 144, the left and right side surfaces corresponding to the left side portion 144c and the right side portion 144d, and the lower side portion 144b although not shown. In the present embodiment, the dimensions d1 and d3 of the ridge 144 are the same on all of the upper surface, the left and right side surfaces, and the lower surface of the ridge 144, but the dimensions of the ridge 144 are the same. d2 is as short as 9 mm on the left and right side surfaces and the bottom surface of the ridge 144 and as short as 7 mm on the top surface of the ridge 144.

  That is, in this embodiment, the width dimension d2 of the projecting surface portion 156 of the conductor piece 152 facing the front surface of the oven front plate 12 is 7 mm at the upper side portion 144a of the ridge 144, whereas the other lower side portion 144b and the left side The portion 144c and the right side portion 144d are different from 9 mm. Accordingly, the width dimension d4 of the upper surface of the oven front plate 12 facing the upper side portion 144a of the ridge 144 is 28 mm, while facing the lower side portion 144b, the left side portion 144c, and the right side portion 144d of the other ridge 144. The width dimension d4 of the lower surface and the left and right side surfaces of the oven front plate 12 is 32 mm, and only the width dimension d4 of the upper surface of the oven front plate 12 can be formed narrower than the width dimension d4 of the other lower surface and left and right side surfaces. Therefore, without changing the external dimensions of the main body 1, it is possible to effectively make the vertical width Wt larger than the horizontal width Wm of the cooking chamber 14, and to ensure a large internal capacity in the cooking chamber 14. Become.

  In addition, since each dimension d1-d3 of such a ridge 144 affects the attenuation | damping performance of the microwave from the cooking chamber 14, it cannot change unnecessarily. Therefore, in the present embodiment, the dimensions d1 to d3 of the ridge 144 are set in a range in which the amount of microwave leakage from the cooking chamber 14 is equal to or less than the evaluation reference value.

  FIG. 31 is a graph showing the measurement results of the amount of radio wave leakage from the microwave oven in the conventional product and this embodiment. The evaluation standard value here is “leakage” specified in at least “Ministerial Ordinance Schedule 8-2 (95) G) that defines technical standards for electrical appliances, considering the safety of products”. The value is equal to or less than the value of the radio wave power density.

In the same section, regarding the power density of radio waves leaking outside the microwave oven,
“(I) With a cylindrical beaker containing 275 cm ³ ± 15 cm ³ of water placed in the center of the vessel, apply a voltage equal to the rated voltage at a frequency equal to the rated frequency to the test piece. When the door is opened and fixed to the maximum position just before the oscillation stop device operates, the value of the power density of the leaked radio wave measured at every point 5 cm away from the surface of the vessel is , Conform to the following.
a When the door is closed, it must be 1 mW / cm ² or less.
b When the door is opened and fixed to the maximum position immediately before the oscillation stop device of the oscillation tube is operated, it must be 5 mW / cm ² or less. "
Therefore, in the state of “door closed” (corresponding to “a” above) with the door 3 closed under the same measurement conditions, the evaluation criterion is 0.3 mW / cm ² , and the door 3 is opened. In a state of “door open” (corresponding to “b” above) immediately before the operation is stopped by a detection signal from the door opening / closing detection means 184 described later, the radio wave from the microwave oven is set as the evaluation standard 3.0 mW / cm ² It was measured whether the amount of leakage satisfied the evaluation criteria.

As a result, it was confirmed that the dimensions d1 to d3 of the ridge 144 were set in the conventional product and this embodiment within the range satisfying this evaluation standard. In this embodiment in particular, in the state of "Tobira閉", found in radio leakage amount was the 0.1 mW / cm ^2, and in the state of "Door open", Telecommunications leakage amount measured value is 1.8 mW / cm ² Met. Therefore, it has been confirmed that the ridge 144 of the present embodiment can effectively attenuate the microwave from the cooking chamber 14 even if each of the dimensions d1 to d3 shown in FIG.

  Next, the cooling structure inside the main body 1 will be described with reference to FIGS. In the main body 1, in addition to the outdoor lower space 32 described above, an outdoor upper space 161 and left and right outdoor side spaces 162 are formed between the outer surface of the cooking chamber 14 and the inner surface of the cabinet 2, respectively. As shown in FIG. 32, the hot air motor 29, the first blower fan 164, the printed circuit board 165, the magnetron 64 of the microwave generator 19, the antenna motor 66, and the inverter 166 are arranged in the outdoor lower space 32, respectively. Is done. The first blower fan 164, which is a centrifugal fan, is provided at one side rear of the outdoor lower space 32, and includes a fan case 167 that forms a wind tunnel therein, and an impeller 168 that is rotatably accommodated in the fan case 167. An electric motor 169 that applies a rotational force to the impeller 168 is a main component. The fan case 167 has an air intake hole 170 for taking in cold air from the outside of the microwave oven through the main body 1 in the direction of the rotation axis of the impeller 168, while Air blowing holes 171 and 172 are formed to send cold air to the cooled part of the lower space 32.

  The printed circuit board 165 is accommodated and held in the board mounting plate assembly 174 in front of the outdoor lower space 32, and an intake 175 is opened on the rear side of the board mounting plate assembly 174 so as to face the air blowing hole 171. It is formed. The inverter 166 serving as a drive power source for the magnetron 64 is housed and held in a bottom duct 176 provided behind the outdoor lower space 32, and an intake 177 is provided on one side of the bottom duct 176 so as to face the air blowing hole 171. Is formed. A hot air motor 29 constituting the hot air unit 24 is disposed on the other side of the bottom duct 176 and behind the outdoor lower space 32, and separately from this, the bottom duct 176 includes other outdoor lower space 32. A cold air outlet 178 is formed to open toward the magnetron 64 provided in the approximate center of the side. As described above, in the present embodiment, in the outdoor lower space 32, the board mounting plate assembly 174 forms an air passage that guides the cold air from the first blower fan 164 to the control board 165, while a bottom duct that is a separate member. 176 has a configuration that forms an air passage that guides the cold air from the first blower fan 164 to the hot air motor 29 and the magnetron 64.

  Note that the arrangement, shape, number, and the like of each component in the outdoor lower space 32 described above can be changed as appropriate in consideration of the air blowing capability of the first blower fan 164 and the like.

  FIG. 33 and FIG. 34 show each configuration of the right outdoor side space 162 and the outdoor upper space 161 connected to the right side when viewed from the front of the main body 1. In each of these drawings, the outdoor upper space 161 is formed between the upper surface of the cabinet 2 and the ceiling wall 14a of the cooking chamber 14, where the upper heater 18 is surrounded by the upper heat shield plate assembly 181. Placed in the state. A hole 182 for wiring connection is formed in the upper heat shield plate assembly 181, and the upper heater 18 and the printed circuit board 165 can be electrically connected through the hole 182.

  The right outdoor side space 162 is formed between the right side surface of the cabinet 2 and the right side wall 14d of the cooking chamber 14, and includes the hinge mechanism 46, the interior lamps 101a and 101b, and the first sensor. 115, the sensor motor 116, the second sensor 118, a door opening / closing detection means 184 for detecting the opening / closing of the door 3, and a second blower fan 185 different from the first blower fan 164 described above. The In the outdoor part space 162, a right heat shield plate assembly 187 similar to the upper heat shield plate assembly 181 is disposed as a heat shield that blocks the heat effect on the cabinet 2. Although not shown, the left outdoor side space 162 formed between the left side surface of the cabinet 2 and the left side wall 14c of the cooking chamber 14 has a hinge mechanism 46, a steam generator, and a heat shield. Left heat shield plate assemblies are respectively disposed.

  The door opening / closing detection means 184 is disposed in the upper front part of the outdoor part space 162 by a plurality of micro switches, and is not only in a state where the door 3 is closed with respect to the main body 1 but also in a state where the door 3 is slightly opened. Is also detected. Near the rear of the door opening / closing detection means 184, upper and lower interior lamps 101a, 101b are disposed, and between the microswitches of the door opening / closing detection means 184 and the interior lights 101a, 101b and the printed circuit board 165. Are electrically connected by wiring. The first sensor 115, the sensor motor 116, and the second sensor 118 are arranged side by side in a substantially central portion in the front-rear direction of the outdoor side space 162. Holes 188 and 189 for wiring connection are formed in the right heat shield plate assembly 187, and the upper heater 18 and the printed circuit board 165 can be electrically connected through the holes 182.

  The second blower fan 185, which is a centrifugal fan, is provided at a position substantially below the center of the outdoor part space 162 and outside the right heat shield plate assembly 187, and includes a fan case 191 that forms a wind tunnel therein, and a fan The main components are an impeller 192 that is rotatably accommodated in the case 191 and an electric motor 193 that applies a rotational force to the impeller 192. The fan case 191 is formed with an intake hole 194 for taking in cold air from the outside of the microwave oven through the main body 1 in the rotation axis direction of the impeller 192, while the outer periphery of the fan case 192 is orthogonal to the outer periphery of the impeller 192. Air blowing holes 195, 196, and 197 are formed to send cold air to the cooled part of the partial space 162.

  Reference numeral 201 denotes a side duct provided as a ventilation path for guiding cool air from the second blower fan 185 to each part in the outdoor part space 162. The side duct 201 is arranged so as to surround the air holes 195, 196, 197 of the second blower fan 185, and from the duct base 202 toward the portion to be cooled in the outdoor side space 162. A plurality of arm portions 203 and 204 extending. A cold air outlet 206 is formed in the duct base 202 toward the second sensor 118. Further, a cold air outlet 207 is formed at the distal end of the arm portion 203 toward the door opening / closing detection means 184 and the interior lamps 101a and 101b, and the first sensor 115 and the sensor motor 116 are also formed at the distal end of the arm portion 204. A cold air outlet 208 is formed to open. Although the second sensor 118 is not attached in FIG. 33, the second sensor 118 can be attached and detached according to the product specifications.

  35 to 37 show an external configuration of the cabinet 2. In these drawings, reference numeral 211 denotes a rib protruding outward from the outer surface of the cabinet 2. Two ribs 211 are formed in a round shape on the right side and the left side of the cabinet 2 respectively. Reference numeral 212 denotes a punching intake hole that faces the intake hole 194 of the second blower fan 185 and takes in cold air from the outside of the microwave oven. The intake hole 212 is formed in the right side surface of the cabinet 2, and ribs 211 are provided before and after the intake hole 212. The shape and number of the ribs 211 are not limited to those shown in the figure, and even when the microwave oven is installed at an arbitrary place, even if the ribs 211 come into contact with the installation wall surface, What is necessary is just to form the protrusion height of the extent which can prevent a heat | fever accumulation between an outer surface and an installation wall surface, and can take in cold air into the inside of the main body 1 from the intake hole 212. FIG.

  FIG. 38 illustrates the main electrical configuration of the microwave oven. In the figure, reference numeral 221 denotes a control means constituted by a microcomputer, and this control means 221 is mounted on the above-described printed circuit board 165, and serves as a CPU as an arithmetic processing means, a memory as a storage means, and a time measuring means. Timers and input / output devices.

  The input port of the control unit 221 includes the operation unit 7 using the keys and the touch panel, the internal temperature distribution detection unit 105, the door open / close detection unit 184 that detects the open / close state of the door 3, and the inside of the cooking chamber 14. Temperature detection means 222 such as a thermistor for detecting the temperature of the air, hot air motor rotation detection means 223 including the detection sensor 45, antenna position detection means 225 for detecting the origin of rotation of the antenna 69, and the above-mentioned steam container Steam container detection means 226 such as a thermistor for detecting the temperature of each is electrically connected.

  In addition to the display means 6 described above, the output port of the control means 221 includes a microwave heating means 231 including a magnetron and its driving means, an upper heater 18 for grill heating, a hot air heater 27 for oven heating, Heater driving means 232 such as a relay for electrically disconnecting the steam heating evaporation heater, antenna driving means 233 for rotating the antenna motor 66, and hot air motor driving means for rotating the hot air motor 29 234, sensor motor driving means 235 for rotating the sensor motor 116 forward and reverse, pump driving means 236 for operating the water supply pump of the steam generator, and the interior lamps 101a and 101b as lighting means The interior lighting driving means 237 for driving the motor, the electric motor 169 of the first blower fan 164, Blower motor drive unit 238 for driving the electric motor 193 of the second blower fan 185 individually are electrically connected, respectively.

  The control means 221 includes an operation signal from the operation means 7, an internal temperature distribution detection means 105, an internal temperature detection means 222, a hot air motor rotation detection means 223, a door opening / closing detection means 184, and an antenna position detection means. 225 and each detection signal from the steam container detection means 226, and at a predetermined timing based on the time measurement from the time measurement means, the microwave heating means 231, the heater drive means 232, the antenna drive means 233, and the hot air motor Drive control signals are output to the drive means 234, sensor motor drive means 235, pump drive means 236, interior lighting drive means 237, and blower motor drive means 238, and display control is provided to the display means 6. It has a function of outputting a signal.

  When the control means 221 receives an operation signal associated with the operation of the operation means 7 and determines that the door 3 is closed based on the detection signal from the door opening / closing detection means 184, the control means 221 performs a micro operation according to the operation signal. Controls various types of cooking by sending control signals to the wave heating means 231, heater driving means 232, antenna driving means 233, hot air motor driving means 234, sensor motor driving means 235, and pump driving means 236 It is the composition to do.

  Next, the operation of the microwave oven having the above configuration will be described. With the cooking object S previously placed in the cooking chamber 14, the door 3 is closed while the handle 4 is held by hand, and the cooking menu is displayed by the operating means 7. When the start of cooking is instructed after the selection operation, a control signal generated corresponding to the selected cooking menu is output at a predetermined timing in accordance with the control program incorporated in the storage unit of the control means 221, and the object to be cooked S is displayed. Cooked by heating.

  Here, for example, when an oven heating cooking menu is selected, a control signal from the control means 221 is sent to the heater driving means 232 and the hot air motor driving means 234, and the hot air heater 27 and the hot air motor 29 are energized, respectively. The rotational force generated in the motor shaft 37 of the motor 29 is transmitted to the shaft 34 of the hot air fan 28 through the transmission mechanism 30. As a result, the hot air fan 28 rotates in one direction inside the heating chamber 31, and its speed is taken into the control means 221 by the hot air motor rotation detecting means 223 and sucked into the heating chamber 31 from the cooking chamber 14 through the suction port 16. Air is sent to the energized hot air heater 27 side, and the heated air is supplied as hot air F to the cooking chamber through the hot air outlet 17 so that the cooking object S in the cooking chamber 14 is heated by the hot air convection. The

  At this time, in the inside of the heating chamber 31, the air blown in the radial direction of the hot air fan 28 is blown to the fins 52 of the hot air heater 27 at almost the entire circumference, and is efficiently turned into hot air. In addition, since the width dimension Wk of the heating chamber 31 is as close as possible to the width dimension Wm of the cooking chamber 14, the hot air F is spread in a wide range, particularly in the lateral direction, inside the heating chamber 31 without rotating the hot air fan 28 forward and backward. Generated. This hot air F further spreads from the hot air outlet 17 provided in the vicinity of the left and right ends of the heating chamber 31 to both corners of the cooking chamber 14 and is sent into a wide area to improve the unevenness of baking of the cooking object S. Can be realized.

  Further, by forming the entire inner surface of the cooking chamber 14 in a round shape, the hot air F blown from the hot air outlet 17 wraps around the inner surface of the cooking chamber 14 in the middle, and the central portion of the cooking chamber 14 To go to. Therefore, the hot air F convects in the whole inside of the cooking chamber 14, and the surroundings of heat become favorable, and as a result, the uneven baking of the cooking object S is effectively improved.

  Furthermore, in this embodiment, the control means 221 receives a detection signal from the internal temperature detection means 222 so that the temperature in the cooking chamber 14 reaches 350 ° C. at the maximum in the cooking menu for oven heating, and the hot air heater 27 The operation of the hot air motor 29 can be controlled. In this case, as the inside of the cooking chamber 14 is exposed to a high temperature with hot air F, far infrared rays R are effectively emitted from the entire inner surface of the cooking chamber 14 coated with the ceramic coating film 60, and the heating time is shortened. The baking unevenness of the object to be cooked S is improved more effectively. In particular, when the object to be cooked S is placed on the square plate 21 and heated by the oven, the hot air F circulates up and down in the cooking chamber 14 through the vent hole 21C of the square plate 21, and the food to be cooked by the hot air F and the far infrared ray R It becomes possible to wrap and bake S from front, back, left and right.

  When the cooking menu for the range heating is selected, the control means 221 receives the detection signal from the internal temperature distribution detection means 105 and the antenna position detection means 225 is heated so that the cooking object S is heated to the set temperature. With this detection signal, appropriate control signals are sent to the microwave heating means 231, the antenna driving means 233, and the sensor motor driving means 235 while confirming the origin position of the antenna 69. As a result, the magnetron and the antenna motor 66 of the microwave generator 19 are energized, and the microwave generated from the surface of the rotating antenna 69 is supplied into the cooking chamber 14 and placed on the bottom wall 14b. S is heated at high frequency.

  During the range heating cooking, the rotation shaft 120 of the sensor motor 116 is positioned at a rotation angle of 0 ° (as shown in FIG. 22, the visual field V1 of the eight infrared detection elements 124 is the bottom wall 14b of the cooking chamber 14). ) In the center in the front-rear direction, and the rotation in the clockwise direction (forward direction) and counterclockwise direction (reverse direction) is repeated. As a result, the first sensor 115 swings inside the main body 1, and the visual field V1 of each infrared detecting element 54 repeatedly swings in a fan shape along the moving direction X1 as shown in FIG. At this time, the rotation shaft 120 of the sensor motor 116 is intermittently rotated at a predetermined angle, and the control means 221 takes in a detection signal from each infrared detection element 124 every time the rotation shaft 120 is rotated at a predetermined angle. Thus, the temperature of the cooking object S placed at an arbitrary position in the cooking chamber 14 is monitored. In this way, each infrared detecting element 124 can receive infrared rays from substantially the entire bottom wall 14 b of the cooking chamber 14 and detect the temperature of the cooking object S placed in the cooking chamber 14. .

  In the present embodiment, in the upper part of the right side wall 14d of the cooking chamber 14, the first sensor 115 is provided in the center rather than in the rear in the front-rear direction, and the cooking object S is located near the center in the front-rear direction of the bottom wall 14b. When placed, the distance from the first sensor 115 to the object to be cooked S approaches and the temperature of the object to be cooked S can be detected more correctly. In particular, during cooking, since the center of the cooking object S is often placed in line with the center of the cooking chamber 14, it is not necessary to provide the first sensor 115 at the position as in this embodiment. The temperature detection accuracy of the food S can be improved.

  In addition, the sensor motor 116 of the present embodiment swings the first sensor 11 with a predetermined time, for example, 5 seconds as one cycle, and the first sensor 115 has 64 locations on one infrared detection element 124 in one way during that time. The temperature of 128 places is detected in a round trip. That is, by swinging the first sensor 115 having eight infrared detection elements 124, the first sensor 115 can measure temperatures of 128 × 8 = 1024 places per cycle, and the first sensor 115 can make a wide cooking chamber. It is possible to detect the internal temperature of 14 in a wide range finely.

  Apart from this, in the present embodiment, the temperature of the cooking object S placed in the field of view V2 of the infrared detecting element 134 as shown in FIG. 24 is continuously detected by the second sensor 118 fixed to the main body 1. The control means 221 takes in a detection signal from the infrared detection element 134 at least every time the rotating shaft 120 of the motor 116 rotates at a predetermined angle or at a time interval shorter than that, so that a central portion in the cooking chamber 14 is obtained. The temperature of the cooking object S in the vicinity is monitored.

  Thus, in the present embodiment, the temperature in the cooking chamber 14 is detected in a wide range and every corner based on each detection signal from the first sensor 115 having eight infrared detection elements 124, and one infrared detection element 134. By the detection signal from the second sensor 118 having the above, it becomes possible to continuously detect the temperature in the vicinity of the central portion in the cooking chamber 14. The control means 221 receives these detection signals, and controls the operation of the microwave generator 19 so that the desired range heating cooking is performed on the cooking object S. Further, as a function of abnormality monitoring, when the detected temperature of the object to be cooked S exceeds the normal range, it is determined that an abnormality has occurred in the device, and the power supply to the microwave generator 19 is forcibly stopped. . In any case, by using the first sensor 115 and the second sensor 118 in combination, the temperature of the object to be cooked S can be determined instantaneously, and as a result, the cooking control and abnormality monitoring can be accurately performed. become.

  Moreover, in this embodiment, the antenna 69 larger than the past is employ | adopted as a microwave radiation | emission means to the cooking chamber 14. FIG. That is, since the large-sized antenna 69 as in the present embodiment has a diameter Ar of 20 cm, when the antenna 69 is rotated, the area for stirring the microwave radiated from the antenna 69 increases, and the cooking chamber 14 Microwaves can be emitted to every corner. This is advantageous for suppressing uneven heating of the cooking object S. Moreover, since microwaves are uniformly radiated in any region from the surface of the flat antenna 69 toward the cooking chamber 14, the object S to be cooked can be heated uniformly over a wide range.

  The microwave radiated into the cooking chamber 14 tends to leak out of the microwave oven from the gap between the cooking chamber 14 and the door 3. However, in the present embodiment, by devising the dimensions d1 to d3 of the ridge 144 provided on the door 3, the leakage amount is attenuated below the evaluation reference value without impairing the radio wave attenuation effect by the ridge 144. Is possible.

  Specifically, each dimension d1 to d3 of the ridge 144 in this embodiment is 1 to 4 mm shorter than that of the conventional product, and the width dimension d4 of the upper surface and the side surface of the oven front plate 12 facing the ridge 144 is also 4 mm. Since it is formed shorter by 8 mm, the horizontal width Wm and the vertical width Wt of the cooking chamber 14 can be increased without changing the outer shape of the main body 1. Furthermore, in the present embodiment, the width dimension d2 of the overhanging surface portion 156 of the conductor piece 152 is intentionally changed between the upper side portion 144a of the ridge 144 and the other lower side portion 144b, the left side portion 144c, and the right side portion 144d, and the upper side portion 144a. By shortening only the width dimension d2, the vertical width dimension Wt is effectively made larger than the horizontal width dimension Wm of the cooking chamber 14 without changing the outer shape of the main body 1, and the contents in the cooking chamber 14 are stored. A large amount can be secured.

  When the steam heating cooking menu is selected, the control means 221 receives the detection signal from the steam container detection means 226, and the heater driving means 232 and the pump are supplied so that steam at the temperature set in the cooking chamber 14 is supplied. Appropriate control signals are sent to the driving means 236, respectively. Thereby, the water supply pump and the evaporation heater of the steam generator are energized, the water stored in the water supply cassette 8 is sent into the evaporation container and heated to a predetermined temperature, and the inside of the cooking chamber 14 is supplied from the steam outlet 33. When the saturated steam or superheated steam is supplied to the cooking object S, the cooking object S is steam-heated.

  Further, when the cooking menu for grill heating is selected, a control signal from the control means 221 is sent to the heater driving means 232, and the upper heater 18 is energized, so that the object S to be cooked can be seen from above the cooking chamber 14. Heated by radiant heat.

  In such cooking, the hot air motor 29, the magnetron 64, the control board 165, the inverter 166 are used as the first heat generating part disposed in the outdoor lower space 32 inside the main body 1 in accordance with the energization control of each part by the control means 221. As the second heat generating part disposed in the outdoor part space 162, the interior lamps 101a and 101b, the first sensor 115, the sensor motor 116, the second sensor 118, and the door opening / closing detection means The temperature of 184 increases. Therefore, in the present embodiment, the electric motor 169 of the first blower fan 164 and the electric motor 193 of the second blower fan 185 are energized by the control signal sent from the control unit 221 to the cold air motor driving unit 238, respectively. Cooling air is blown to the 1 heat generating part and the second heat generating part to suppress the temperature rise.

  Specifically, when the impeller 168 rotates inside the fan case 167 by energization of the electric motor 169 of the first blower fan 164, the cold air taken into the intake hole 170 from the outside of the microwave oven is changed to the blower hole 171. To the inlet 175 of the board mounting plate assembly 174, and from another blower hole 172 to the inlet 177 of the bottom duct 176. Thereby, the cooling air guided into the board mounting plate assembly 174 takes away heat generated from the printed circuit board 165, and the cooling air introduced into the bottom duct 176 takes away heat generated from the inverter 166. Further, a part of the cooling air that has passed through the bottom duct 176 reaches the hot air motor 29 and takes away heat generated from the hot air motor 29, and the remaining cooling air is sent from the cold air outlet 178 to the magnetron 64. Take away the heat that comes from. In this way, when the first fan 164 disposed in the outdoor lower space 32 inside the main body 1 is driven in response to the control signal from the control means 221, the hot air motor 29 and the magnetron 64 are driven in the outdoor lower space 32 inside the same main body 1. In addition, it is possible to effectively blow cooling air to the control board 165 and the inverter 166 to simultaneously suppress the temperature rise of these heat generating portions.

  Further, when the impeller 192 rotates inside the fan case 191 by energization of the electric motor 193 of the second blower fan 185, the cold air taken into the intake hole 194 from the outside of the microwave oven becomes the blower holes 195, 196. 197 is sent out to the duct base 202 of the side duct 201. Thereby, the cooling air sent out from the cold air outlet 206 of the duct base 202 to the second sensor 118 takes away the heat generated from the second sensor 118. Further, the cooling air guided from the duct base 202 to the arm portion 203 is sent from the cold air outlet 207 to the door opening / closing detection means 184 and the interior lamps 101a and 101b, and the door opening / closing detection means 184 and the interior lamp 101a. , 101b, the cooling air taken from the duct base 202 to another arm portion 204 is sent from the cold air outlet 208 to the first sensor 115 and the sensor motor 116, and the first sensor 115 and the sensor The heat generated from the motor 116 is taken away. In this way, when the second fan 185 arranged in the outdoor side space 162 inside the main body 1 is driven in response to the control signal from the control means 221, the inside lamp 101a, 101b, the first sensor 115, the sensor motor 116, the second sensor 118, and the door opening / closing detection means 184 can be effectively blown with cooling air to simultaneously suppress the temperature rise of these heat generating portions. .

  As described above, in the present embodiment, the hot air motor 29, the magnetron 64, the control board 165, and the inverter 166 disposed in the outdoor lower space 32 of the cooking chamber 14 are cooled by the first blower fan 164 inside the main body 1. The interior lamps 101a and 101b, the first sensor 115, the sensor motor 116, the second sensor 118, and the door opening / closing detection means 184 disposed in the outdoor part space 162 of the cooking chamber 14 are separated from each other. It can be cooled by the two blower fans 185. In this case, the control unit 211 may control the driving of the first blower fan 164 and the second blower fan 185 at the same time, or may control them separately. Anyway, since each heat generating part arranged in the outdoor lower space 32 and the outdoor side space 162 of the cooking chamber 14 is cooled by the two blower fans 164 and 185, respectively, the outdoor lower space 32 and the outdoor side space. It is not necessary to provide a duct between the air outlet 162 and the cooling air, and the cooling air can be efficiently blown to each heat generating portion in the shortest time.

  As described above, the microwave oven as the heating cooker of the present embodiment is provided on the main body 1 including the cooking chamber 14 that houses the cooking object S and the front surface of the main body 1, and opens and closes the front opening of the cooking chamber 14. And a ridge 144 as a frame-like choke structure for attenuating radio waves from the cooking chamber 14 is provided at the peripheral portion of the door 3, and the ridge 144 has a concave radio wave attenuation groove. The choke groove 148 and the conductor pieces 152 that are periodically arranged to extend to the opening side of the choke groove 148, and the amount of radio wave leakage from the cooking chamber 14 is preferably determined by the Electrical Appliance and Material Safety Law. The overhanging surface portion 156 that is the facing portion of the conductor piece 152 that faces the oven front plate 12 that is the front surface of the main body 1 within a range that is equal to or less than the evaluation reference value that is set to be equal to or less than the power density value of the leaked radio wave One side of 144 And upper portion 144a eg to or lower portion 144b is another sides, and left portions 144c, are formed in different widths d2 between the right side portion 144d.

  In this case, the width dimension d2 of the overhanging surface portion 156 of the conductor piece 152 is set in a frame shape within the range in which the amount of radio wave leakage from the cooking chamber 14 is equal to or less than the evaluation reference value serving as the reference value. The oven facing the upper side 144a by making the width dimension d2 of the upper side part 144a shorter than the width dimension d2 of another lower side part 144b, the left side part 144c, and the right side part 144d, for example. The width dimension d4 of the upper surface of the front plate 12 is made narrower than the width dimension d4 of the left and right side surfaces and the lower surface of the oven front plate 12 facing the lower side portion 144b, the left side portion 144c, and the right side portion 144d, and the main body accordingly. It is possible to increase the internal capacity of the cooking chamber 14 without changing the external dimensions of 1.

  In the present embodiment, the cooking object S placed in the cooking chamber 14 is cooked by the hot air unit 24 that is a heating means, and in particular, the four corners that are the bent corners of the inner surface of the cooking chamber 14. Each of the portion 55 and the corner portion 56 is formed in an R shape with a chamfer dimension of a radius of 10 mm or more.

  In this case, the four corners 55 and the corners 56 that are the corners of the inner surface of the cooking chamber 14 are not squared, and the radius is 10 mm or more so that the cloth has the four corners 55 and the corners 56 at the time of cleaning. The scorch and dirt adhering to the four corners 55 and the corners 56 can be easily removed using the fingertips, and the cleanability of the inner surface of the cooking chamber 14 can be further improved. Moreover, not only the ceiling wall 14a which comprises the inner surface of the cooking chamber 14, but also the four corners 55 and the corners 56 are formed in a round shape so that the hot air supplied from the heating chamber 31 in the cooking chamber 14 is improved. It is possible to effectively improve the uneven baking of the object to be cooked S.

  Moreover, in this embodiment, the rib 211 which protrudes outward is provided in the outer surface of the cabinet 2 used as the outline member of the main body 1. FIG.

  Thereby, when the microwave oven is installed at an arbitrary place, even when the rib 211 is in contact with the installation wall surface, a predetermined amount corresponding to the protrusion of the rib 211 is provided between the main body 1 and the installation wall surface. Space is secured. Therefore, it is possible to reliably prevent heat accumulation around the microwave oven using this space.

  Moreover, in this embodiment, the 1st ventilation fan 164 and the 2nd ventilation fan 185 are each arrange | positioned in the outdoor lower part space 32 and the outdoor side part space 162 of the cooking chamber 14 in the inside of the main body 1, and from the 1st ventilation fan 164, it is. Is supplied to the hot air motor 29, the magnetron 64, the control board 165, and the inverter 166 as the first heat generating unit disposed in the outdoor lower space 32, while the cooling air from the second blower fan 185 is supplied. And a structure for sending air to the interior lamps 101a and 101b as the second heat generating parts arranged in the outdoor part space 162, the first sensor 115, the sensor motor 116, the second sensor 118, and the door opening / closing detection means 184. It has become.

  In this case, in the main body 1, the first heat generating portion disposed in the outdoor lower space 32 of the cooking chamber 14 and the second cooled portion disposed in the outdoor portion space 162 of the cooking chamber 14 are separately provided. By cooling with the 1st ventilation fan 164 and the 2nd ventilation fan 185, it becomes unnecessary to guide cooling air from the outdoor lower space 32 of the cooking chamber 14 to the outdoor side space 162. Therefore, it becomes possible to efficiently blow cooling air into the outdoor space of the cooking chamber 14 that is limited inside the main body 1.

  In addition, as an effect of the example, in the present embodiment, a coating film 60 mainly composed of inorganic component particles 59 having a particle size of 1000 nm or less is formed on the inner surface of the cooking chamber 14.

  In this case, since the coating film 60 formed on the inner surface of the cooking chamber 14 is a coating layer mainly composed of fine particles 59, scorching and dirt adhering to the surface cannot enter the coating film. The chamfer dimension of the portion 55 and the corner portion 56 can be easily removed by wiping, in combination with the formation of an R shape with a radius of 10 mm or more.

  Moreover, the microwave oven of this embodiment heats the to-be-cooked object S put in the cooking chamber 14 by radiating a microwave from the rotatable antenna 69 to the inside of the cooking chamber 14, In particular, the antenna 69 has a flat plate shape that is not dome-shaped, and is disposed to face the bottom wall 14b of the cooking chamber 14, and the antenna 69 has a diameter of 20 cm or more.

  In this case, when the antenna 69 is rotated by forming the antenna 69 facing the bottom wall 14b of the cooking chamber 14 into a flat plate shape instead of a dome shape and setting the diameter of the antenna 69 to 20 cm or more, The area where the radio wave radiated from the antenna 69 is stirred increases, and the radio wave is radiated uniformly from the antenna 69 toward the cooking chamber 14. Therefore, it becomes possible to heat the to-be-cooked object S in a wide range without unevenness, and the unevenness of the to-be-cooked object S can be reduced.

  Moreover, the microwave oven of this embodiment has the cooking chamber 14 which accommodates the to-be-cooked object S, and the heating chamber 31 in the outdoor back of the cooking chamber 14, and supplies hot air from this heating chamber 31 to the inside of the cooking chamber 14. In particular, the horizontal width Wk of the heating chamber 31 is formed substantially equal to the horizontal width Wm of the cooking chamber 14, and hot air outlets 17 are provided near the left and right ends of the heating chamber 31. ing.

  Accordingly, the hot air fan 28 can be rotated only in one direction without rotating in the forward and reverse directions, and hot air can be supplied in a wider range from the heating chamber 31 to the cooking chamber 14, and the cooking object S in the cooking chamber 14 is baked. Unevenness can be improved.

  Moreover, the microwave oven of this embodiment is provided with the cooking chamber 14 which accommodates the to-be-cooked object S, and the rotatable door 3 which opens and closes the opening part of this cooking chamber 14, and especially the door 3 is provided. An oil damper 88 is provided that increases the braking force applied to the door 3 as it is closed.

  In this case, by installing an oil damper 88 that gradually increases the braking force to the door 3 as the door 3 is closed, the door 3 is gently and gently closed even if the door 3 is released before the door 3 is completely closed. It becomes possible.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, the direction in which the door 3 opens and closes is not limited to that of the present embodiment, and can be changed as appropriate.

3 Door 14 Cooking room 14a Ceiling wall 24 Hot air unit (heating means)
29 Hot air motor (first heat generating part)
55 Four corners (corner corners)
56 corners (corner corners)
64 Magnetron (first heating part)
101a, 101b Interior light (second heat generating part)
115 1st sensor (2nd heat generating part)
116 sensor motor (second heat generating part)
118 Second sensor (second heat generating part)
144 Ridge (choke structure)
144a Upper side (one side)
144b Lower side (another side)
144c Left side (another side)
144d Right side (another side)
148 Choke groove (Radio wave attenuation groove)
152 Conductor piece 156 Overhang surface part (opposite part)
164 First blower fan 165 Control board (first heat generating part)
166 Inverter (first heat generating part)
184 Door opening / closing detection means 185 Second blower fan 211 Rib S Cooking object

Claims (4)

A main body with a cooking chamber for storing the food;
A door provided on the front surface of the main body and opening and closing the front opening of the cooking chamber;
A frame-like choke structure that attenuates radio waves from the cooking chamber is provided at the peripheral edge of the door,
The choke structure has a concave radio wave attenuation groove, and conductor pieces extending and periodically arranged on the opening side of the radio wave attenuation groove,
In the range where the amount of radio wave leakage from the cooking chamber is a reference value or less, the facing portion of the conductor piece facing the front surface of the main body is formed with a different width dimension on one side and another side of the choke structure. A cooking device characterized by that. In a heating cooker that heats and cooks an object to be cooked in a cooking chamber by a heating means
Forming a ceiling wall on the inner surface of the cooking chamber in a dome shape;
The cooking device according to claim 1, wherein a corner portion of the inner surface of the cooking chamber is formed in an R shape having a radius of 10 mm or more.   The cooking device according to claim 1 or 2, wherein a rib protruding outward is provided on an outer surface of the main body. A first blower fan and a second blower fan are respectively disposed in the outdoor lower space and the outdoor space of the cooking chamber inside the main body,
Cooling air from the first blower fan is blown to the first heat generating part disposed in the outdoor lower space,
The cooking device according to claim 1 or 2, wherein cooling air from the second blower fan is blown to a second heat generating portion arranged in the outdoor portion space.