Heating Regulator

Abstract

To provide a heating cooker which can secure the grounding of microwave shield glass without impairing visibility in a warehouse when using microwave heating means.SOLUTION: A heating cooker comprises a heating chamber 2 for accommodating a heated product, microwave heating means for microwave-heating the heated product, a door 20A which can be opened and closed with respect to the heating chamber 2, and a door base 21 having a choke structure 26 arranged at the external periphery of the door 20A. The door 20A has microwave shield glass 40A having warehouse inside glass 41 and warehouse outside glass 42 which are arranged while opposing the heating chamber 2, and a conductive member 43 arranged between the warehouse inside glass 41 and the warehouse outside glass 42. The choke structure 26 is arranged at the door base 21, and a choke structure 27 which is different from the choke structure 26 is arranged at the internal peripheral side of the choke structure 26 over the entire periphery.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a cooking appliance.

Background Art

[0002] A cooking appliance places a food item to be cooked in a heating chamber and cooks it by heating. To store the object to be heated in the main body, the front part of the main body housing is provided with an openable and closable door. This door is provided with a viewing window for checking the state of the food item in the heating chamber. The viewing window is composed of a metal plate (punching metal) in which a plurality of punching holes are formed in order to prevent microwaves from leaking outside the main body during microwave heating.

[0003] Patent Document 1 describes a structure in which a conductive film is provided on a transparent heat-resistant resin sheet between inner and outer door glasses so that cooking can be advanced while observing the cooking situation. Patent Document 2 describes a structure in which part or all of the punching metal is removed and a transparent conductor is used to improve the visibility inside the storage.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the cooking appliance described in Patent Document 1, a specific structure for electrically connecting the conductive film has not been studied. Further, in the cooking appliance described in Patent Document 2, a specific structure for electrically connecting the transparent conductor to the punching metal has not been studied.

Means for Solving the Problems

[0006] The present invention comprises a heating chamber for containing an object to be heated, a heating source for heating the object with microwaves, a door that can be opened and closed relative to the heating chamber, and a door base provided on the outer periphery of the door, wherein the door has microwave shielding glass comprising transparent glass positioned opposite the heating chamber and a conductive member laminated on the glass, and the door base is provided with a choke structure, and on the inner periphery side of the choke structure, another choke structure is provided around the entire circumference, The door base has a plate portion that contacts the front plate of the heating chamber when the door is closed, the plate portion is located on the inner circumference side of the choke structure, and the other choke structure is located on the inner circumference side of the plate portion. The microwave shielding glass is constructed by sandwiching and bonding the conductive member between an inner glass located on the heating chamber side and an outer glass located on the opposite side of the heating chamber, the outer glass being formed to have a shorter outer circumference than the inner glass, the conductive member being exposed on the outer surface of the inner glass, and the outer glass having an end on the inner circumference side of the other choke structure. The door base is in contact with the conductive member on the inner circumference side of the plate portion, with the outer peripheral edge of the conductive member sandwiched between the door base and the interior glass. The plate portion at the tip of the other choke structure is characterized by having a gap formed between it and the conductive member. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of the heating appliance according to the first embodiment. [Figure 2] This is a perspective view showing the door of the heating appliance of the first embodiment in the open position. [Figure 3] This is a longitudinal cross-sectional perspective view of the heating appliance according to the first embodiment. [Figure 4] This is a view taken along the X-direction arrow in Figure 3. [Figure 5] This is a cross-sectional perspective view showing the internal door structure of the heating appliance according to the first embodiment. [Figure 6] This is a perspective view showing the door base unit with a choke structure inside the door of the heating appliance according to the first embodiment. [Figure 7] This is a longitudinal cross-sectional view showing the internal structure of the door of the heating appliance according to the first embodiment. [Figure 8] This is a cross-sectional view showing the internal structure of the door of the cooking appliance according to the first embodiment. [Figure 9] This is a longitudinal cross-sectional view showing the internal door structure of the heating appliance according to the second embodiment. [Figure 10] This is a cross-sectional view showing the internal structure of the door of the heating appliance according to the second embodiment. [Figure 11] This is a longitudinal cross-sectional view showing the internal door structure of the third embodiment of the cooking appliance. [Figure 12] This is a cross-sectional view showing the internal structure of the door of the third embodiment of the cooking appliance. [Figure 13A] This is a rear view showing the upper and lower sides of the other choke structure of the heating cooker of the fourth embodiment in an unfolded state. [Figure 13B] This is a rear view showing the other choke structure parts of the heating cooker of the fourth embodiment in a folded state. [Figure 13C] This is a rear view showing the left and right sides of the other choke structure of the heating cooker of the fourth embodiment attached. [Modes for carrying out the invention]

[0008] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as "embodiments") will be described in detail with reference to the drawings as appropriate. The description will be based on the direction shown in Figure 1.

[0009] (First Embodiment) Figure 1 is an external perspective view of the heating appliance according to the first embodiment. As shown in Figure 1, the cooking appliance 1A comprises a main body 10 covered by a cabinet 11 that surrounds its outer perimeter, and a rotatable door 20A on the front of the main body 10. The door 20A includes a door base 21 (see Figure 3), a door frame 22, a handle 23, an operation panel 24, and an outer door glass 25.

[0010] The door frame 22 is a resin molded part that constitutes the outer periphery of the door 20, and is configured to surround the entire perimeter of the upper, lower, left, and right sides of the door 20A. The handle 23 is a grip for opening and closing the door 20A, and is integrally formed with the door frame 22 by a resin molded part. The operation panel 24 includes an operation part and a display part. The outer door glass 25 is composed of a transparent glass plate and is fitted into the door frame 22.

[0011] Also, the door 20A prevents the leakage of microwaves used when heating the object to be cooked, confines the heat of the heater, and enables efficient heating.

[0012] FIG. 2 is a perspective view showing the state in which the door of the cooking heater according to the first embodiment is opened. As shown in FIG. 2, the cooking heater 1A includes a heating chamber 2 for storing an object to be cooked (not shown), which is an object to be heated, inside the main body 10. This heating chamber 2 has a bottom plate 2a, a rear plate 2b, an upper plate 2c, a right side plate 2d, and a left side plate 2e, and a rectangular opening is formed in the front surface. Note that FIG. 2 shows a state in which a tray is stored on the bottom plate 2a of the heating chamber 2.

[0013] On the back side of the door 20A (the side of the main body 10 when the door 20A is closed), a rectangular frame-shaped outer peripheral surface 20a is formed. Around the entrance of the heating chamber 2 facing this outer peripheral surface 20a, a heating chamber front plate 3 is provided. This heating chamber front plate 3 has vertical portions 3a extending in the vertical direction (up and down direction) on the left and right sides, and horizontal portions 3b extending in the horizontal direction (left and right direction) from the upper and lower ends between the vertical portions 3a, and is formed in a rectangular frame shape. The vertical portions 3a and the horizontal portions 3b are formed of flat surfaces, and when the door 20A is closed, they are in surface contact with the outer peripheral surface 20a of the door 20A.

[0014] FIG. 3 is a longitudinal cross-sectional perspective view of the cooking heater according to the first embodiment. Note that FIG. 3 partially omits the illustration of the cabinet 11 (see FIG. 1) and the components provided below the bottom plate 2a. As shown in Figure 3, a door base 21 equipped with a choke structure 26 to prevent microwave leakage is provided inside the outer perimeter of the door 20A (inside the door frame 22). The door base 21 forms the framework of the door 20A and is constructed by processing a metal plate material such as iron by cutting, punching, bending, drawing, etc.

[0015] The choke structure 26 is formed over the entire outer circumference of the door 20A. In Figure 3, a portion of the choke structure 26 extending horizontally at the top and bottom of the door 20A is shown, while the choke structure extending vertically on the left and right sides of the door 20A is omitted from the illustration.

[0016] Furthermore, in addition to the choke structure 26, the door 20A is provided with another choke structure 27. This choke structure 27, like the choke structure 26, attenuates microwaves leaking from the heating chamber 2 and is formed integrally with the door base 21. The choke structure 27 is located on the inside (inner circumferential side) of the choke structure 26, which is provided on the outer circumference of the door 20A. In other words, the choke structure 27 is located between the outer door glass 25 and the outer edge of the microwave shielding glass 40A. The choke structure 27 is also formed along the choke structure 26, extending over the entire circumferential direction.

[0017] Below the base plate 2a, a microwave heating means 30 is provided that operates when heating food in a microwave oven. This microwave heating means 30 consists of a magnetron that generates microwaves, a waveguide that sends microwaves to the heating chamber 2, and the like. The cooking appliance 1A of this embodiment may also be equipped with an oven heating means (not shown) using a heater. Furthermore, the cooking appliance 1A of the first embodiment may be applied to a single-function type equipped only with the microwave heating means 30, or to an oven range type equipped with the microwave heating means 30 and an oven heating means.

[0018] Furthermore, the door 20A is provided with a transparent microwave shielding glass 40A on the inside of the chamber, beyond the outer door glass 25. This microwave shielding glass 40A has the function of blocking microwaves and preventing them from leaking outside the heating chamber 2. In other words, the heating cooker 1A of the first embodiment does not use perforated metal, which has been used in the past to achieve both visibility inside the chamber and prevention of microwave leakage.

[0019] Figure 4 is a view in the direction of the arrow X in Figure 3. In Figure 4, the door 20A is completely closed, with the outer surface 20a of the door 20A in full contact with the heating chamber front plate 3, which is provided around the front opening of the heating chamber 2.

[0020] As shown in Figure 4, the microwave shielding glass 40A is composed of an inner glass 41 (glass) located on the heating chamber 2 side, an outer glass 42 (glass) located on the opposite side (outside the heating chamber), and a conductive member 43 provided between the inner glass 41 and the outer glass 42. The inner glass 41 and the outer glass 42 are transparent to visible light, allowing the food being cooked inside the heating chamber 2 to be seen from outside the oven. The inner glass 41 and the outer glass 42 are fixed to each other via adhesive, with the conductive member 43 in between. Thus, the microwave shielding glass 40A is a double-glazed glass in which the inner glass 41 and the outer glass 42 are bonded and fixed together. This bonded fixing of the inner glass 41 and the outer glass 42 suppresses the scattering of glass fragments in the event of breakage due to impact or other reasons.

[0021] Furthermore, the inner glass 41 and the outer glass 42 are made of glass plates with excellent heat resistance and impact resistance. In addition, the inner glass 41 and the outer glass 42 are both the same shape, and are configured so that their four sides (top, bottom, left, and right) coincide with each other.

[0022] The conductive member 43 can be a metal mesh woven in a grid pattern of metal warp threads and metal weft threads. Furthermore, the opening ratio of the metal mesh is set to be larger (e.g., 70% or 78% or more) than the opening ratio of commonly used perforated metal (e.g., 50%). This improves visibility when looking into the heating chamber 2 from outside the oven (outside the heating cooker 1A) compared to when using perforated metal (a metal plate with multiple circular holes formed in it). In addition, the conductive member 43 is not limited to transparent conductors such as ITO (Indium Tin Oxide), but colored conductors may also be used, as long as visibility inside the heating chamber 2 is not impaired.

[0023] Furthermore, using a metal mesh for the conductive member 43 is preferable in terms of detecting partial damage or peeling of the conductive member 43. By using a metal mesh, the conductive member 43 can be thinly visualized without impairing visibility inside the heating chamber 2. If a part of the conductive member 43 is damaged or peeled, it is difficult to detect this by continuity testing, so visual detection is necessary. However, if a transparent material that cannot be seen, such as a conductive film as mentioned in the conventional technology, is used, it becomes difficult to detect partial damage or peeling. Therefore, it is preferable to use a material such as a metal mesh that can be seen without impairing visibility inside the heating chamber 2 for the conductive member 43, in terms of detecting partial damage or peeling of the conductive member 43.

[0024] Furthermore, the conductive member 43 is not limited to a metal mesh, but may be a metal printed in a grid pattern (mesh pattern). For example, a paste-like conductive member can be formed on the surface of the inner glass 41 or the outer glass 42 of the oven by screen printing.

[0025] Figure 5 is a cross-sectional perspective view showing the internal door structure of the heating appliance according to the first embodiment. As shown in Figure 5, the choke structures 26 and 27 are formed by bending a metal plate, such as iron, multiple times and creating a comb-like structure along the circumferential direction. In Figure 5, only a portion of the upper part of the door 20A is shown, but the choke structures 26 and 27 are formed continuously around the entire circumference of the upper, lower, left, and right sides of the door 20A. Incidentally, a portion of the door base 21 is in contact with the heating chamber front plate 3, and if the door base 21 and the heating chamber front plate 3 are in contact without any gaps, microwaves will not leak from around the door 20A. However, when the door base 21 or the heating chamber front plate 3 is heated to a high temperature, such as during oven heating, the flatness of the surface may change due to the expansion of the metal. In this case, a small gap may be created between the door base 21 and the heating chamber front plate 3, and microwaves may leak from the gap. Therefore, the aforementioned choke structures 26 and 27 are provided around the door base 21.

[0026] The door base 21 has a plate portion 21a extending downward at the front end of the choke structure 26, and a plate portion 21b extending rearward (towards the heating chamber front plate 3) at the lower end of the plate portion 21a. The door base 21 also has a plate portion 21c extending downward (towards the upper end of the microwave shielding glass 40A) from the rear end of the plate portion 21b, and an L-shaped plate portion 21d extending forward and then downward from the lower end of the plate portion 21c. The plate portion 21c is designed to contact the heating chamber front plate 3 when the door is closed. The plate portion 21d is positioned opposite the outer surface of the outer edge of the outer glass 42. In Figure 5, only a portion of the upper part of the door base 21 is shown, but like the choke structure 26, it is formed continuously around the entire circumference of the upper, lower, left, and right sides of the door 20A.

[0027] The choke structure 27, like the choke structure 26, is made by bending an iron metal plate multiple times and forming a comb-like structure along the circumferential direction. The choke structure 27 is also formed continuously with the lower end of the plate portion 21d of the door base 21. Specifically, it has a plate portion 27a extending forward from the lower end of the plate portion 21d, a plate portion 27b extending vertically downward from the front end of the plate portion 27a, a plate portion 27c extending rearward from the lower end of the plate portion 27b, and a plate portion 27d extending vertically upward from the rear end of the plate portion 27c, which is shorter than the plate portion 27b. The plate portions 27a and 27b are formed by a single surface along the left-right direction, while the plate portions 27c and 27d are formed in a comb-like structure along the left-right direction. Furthermore, a bent portion may be provided at the tip of the plate portion 27d, and a plate portion that extends inward towards the choke structure 27 composed of plate portions 27a, 27b, 27c, and 27d may be provided.

[0028] Figure 6 is a perspective view showing the door base unit with the choke structure inside the door of the first embodiment of the cooking appliance. Note that Figure 6 shows the view from the rear (inside the oven). As shown in Figure 6, the plate portion 21c of the door base 21 is located on the inner circumference side of the choke structure 26. This plate portion 21c is formed to form a rectangular frame-like surface along the heating chamber front plate 3 (see Figure 2) (only a portion is shown in Figure 6). Furthermore, a choke structure 27 is provided on the inner circumference side of the plate portion 21c (only a portion is shown in Figure 6).

[0029] The plate portion 27d at the tip of the upper chalk structure 27 is configured to stand upright in the vertical direction. The plate portion 27d at the tip of the right chalk structure 27 is configured to stand upright to the right in the horizontal direction. Although not shown in the figures, the plate portion at the tip of the lower chalk structure 27 is configured to stand upright in the vertical direction, and the plate portion at the tip of the left chalk structure 27 is configured to stand upright to the left in the horizontal direction.

[0030] Figure 7 is a vertical cross-sectional view showing the internal structure of the door of the cooking appliance according to the first embodiment, and Figure 8 is a horizontal cross-sectional view showing the internal structure of the door of the cooking appliance according to the first embodiment. As shown in Figures 7 and 8, the inner glass 41 and the outer glass 42 are made of glass of the same shape (same specifications) as described above. Furthermore, the conductive member 43 provided between the inner glass 41 and the outer glass 42 has a shape that matches the outer peripheral edges of the inner glass 41 and the outer glass 42, and is configured so that the edges of the conductive member 43 do not protrude from the ends of the inner glass 41 and the outer glass 42.

[0031] As shown in Figure 7, the outer edge 42s of the outer glass 42 is fixed to the door base 21 while being pressed against the rear surface 21d1 of the plate portion 21d from the inside (heating chamber 2 side). That is, the silicone sealant 50 (sealant) is applied so as to span the inner glass 41, the outer glass 42 and the door base 21 (plate portions 21c, 21d). The silicone sealant 50 has heat resistance, adhesive properties, etc. By using the silicone sealant 50 in this way, it is possible to prevent foreign matter from entering the door 20A through the gap between the microwave shielding glass 40A and the door base 21.

[0032] Although not shown in the illustration, the silicone sealant 50 is continuously applied to the entire circumference of the upper, lower, left, and right edges of the microwave shielding glass 40A. The door base 21 is grounded via the main body 10 (housing). Note that the silicone sealant 50 is not shown in Figure 8. The conductive member 43 provided on the microwave shielding glass 40A is not electrically connected to the door base 21 (choke structure 26, 27), but it has the function of attenuating electromagnetic waves (microwaves).

[0033] Alternatively, a conductive silicone sealant, which is silicone with conductivity added, may be used instead of the silicone sealant 50. This allows the door base 21 and the conductive member 43 to be electrically connected.

[0034] Furthermore, a gap S1 is formed between the plate portion 27d of the choke structure 27 and the outer glass 42 of the microwave shielding glass 40A. This prevents the choke structure 27 from coming into contact with the outer glass 42 and damaging it.

[0035] Furthermore, since the choke structure 27 is located on the outer periphery of the microwave shielding glass 40A, it is possible to suppress any impairment of visibility when looking into the heating chamber 2 from outside the chamber.

[0036] As described above, the heating cooker 1A of the first embodiment comprises a heating chamber 2 for housing an object to be heated, a microwave heating means 30 for heating the object with microwaves, a door 20A that can be opened and closed relative to the heating chamber 2, and a door base 21 provided on the outer circumference of the door 20A. The door 20A has a microwave shielding glass 40A comprising an inner glass 41 and an outer glass 42 arranged opposite the heating chamber 2, and a conductive member 43 laminated on the inner glass 41 and the outer glass 42. The door base 21 is provided with a choke structure 26, and on the inner circumference side of the choke structure 26, a separate choke structure 27 is provided around the entire circumference. With this, even if the conductive member 43 of the microwave shielding glass 40A is not electrically connected to the door base 21, microwaves leaking from the glass (inner glass 41 and outer glass 42) can be suppressed. Furthermore, by providing a separate choke structure 27 inside the choke structure 26, microwave leakage from the heating chamber 2 can be further suppressed.

[0037] (Second Embodiment) Figure 9 is a vertical cross-sectional view showing the internal structure of the door of the heating appliance according to the second embodiment, and Figure 10 is a horizontal cross-sectional view showing the internal structure of the door of the heating appliance according to the second embodiment. Note that components similar to those in the first embodiment are denoted by the same reference numerals, and redundant explanations are omitted. As shown in Figures 9 and 10, the heating appliance 1B of the second embodiment is equipped with a door 20B that has microwave shielding glass 40B instead of microwave shielding glass 40A of the first embodiment. This microwave shielding glass 40B comprises an inner glass 41, an outer glass 44, and a conductive member 43.

[0038] The outer glass 44 is formed with a shorter outer circumference than the inner glass 41, and its overall diameter is slightly smaller than the inner glass 41. Furthermore, the outer edge 44a of the outer glass 44 is located inside (towards the inner circumference) of the choke structure 27. The outer glass 44 is laminated so as not to protrude from the inner glass 41, forming a stepped portion 40a between them. The outer edge of the conductive member 43 is larger than the outer edge of the outer glass 44. As a result, the outer edge 43u of the conductive member 43 is exposed facing outwards at the stepped portion 40a. The plate portion 21d of the door base 21 is in contact with the outer edge 43u of the conductive member 43.

[0039] The outer peripheral edge 43u of the conductive member 43 is fixed via a silicone sealant 50 while being pressed against the rear surface of the plate portion 21d of the door base 21. Although not shown in the figures, the outer peripheral edge 43u is formed to be exposed on the four sides of the interior glass 41 (upper, lower, left, and right sides) and is in contact with and electrically connected to the entire circumference of the door base 21.

[0040] Furthermore, a gap S2 is formed between the plate portion 27d of the choke structure 27 and the conductive member 43 laminated on the outer glass 44 of the microwave shielding glass 40B. This prevents the choke structure 27 from coming into contact with the conductive member 43 and damaging it.

[0041] In the second embodiment configured as described above, the microwave shielding glass 40B (electromagnetic wave shielding glass) is constructed by sandwiching a conductive member 43 between an inner glass 41 located on the heating chamber 2 side and an outer glass 44 located on the opposite side of the heating chamber 2, and bonding them together. The outer glass 44 is formed to have a shorter outer circumference than the inner glass 41, and the conductive member 43 is exposed on the outer surface of the inner glass 41. The outer edge 44a (end) of the outer glass 44 is located on the inner side (inside) of the choke structure 27. This makes it possible to reduce the distance between the choke structure 27 and the conductive member 43, thereby improving the electromagnetic wave (microwave) attenuation performance.

[0042] (Third embodiment) Figure 11 is a vertical cross-sectional view showing the internal structure of the door of the third embodiment of the cooking appliance, and Figure 12 is a horizontal cross-sectional view showing the internal structure of the door of the third embodiment of the cooking appliance. As shown in Figures 11 and 12, the third embodiment of the cooking appliance 1C is equipped with a door 20C that has a microwave shielding glass 40C instead of the microwave shielding glass 40A of the first embodiment. This microwave shielding glass 40C comprises an inner glass 41, an outer glass 45, and a conductive member 43.

[0043] The outer glass panel 45 is thinner than the inner glass panel 41. Furthermore, the inner glass panel 41 and the outer glass panel 45 are configured so that their four sides (top, bottom, left, and right) coincide. Additionally, the edges of the conductive member 43 are configured so as not to protrude from the edges of the inner glass panel 41 and the outer glass panel 45.

[0044] As shown in Figure 11, a gap S3 is formed between the plate portion 27d of the choke structure 27 and the outer glass 45 of the microwave shielding glass 40A. This prevents the choke structure 27 from contacting the outer glass 45 and scratching the outer glass 45.

[0045] In this third embodiment, since the outer glass 45 is formed thinner than the inner glass 41, the choke structure 27 can be brought closer to the conductive member 43 compared to an embodiment where the outer glass is the same thickness as the inner glass 41, thereby improving microwave attenuation performance.

[0046] (Fourth Embodiment) Figure 13A is a rear view showing the upper and lower sides of the other choke structure of the cooking appliance of the fourth embodiment in an unfolded state, Figure 13B is a rear view showing the upper and lower sides of the other choke structure of the cooking appliance of the fourth embodiment in a folded state, and Figure 13C is a rear view showing the left and right sides of the other choke structure of the cooking appliance of the fourth embodiment in an attached state. The fourth embodiment of the cooking appliance has a choke structure 27 in which a part of the choke structure 27 is made of a separate part from the door base 21. The choke structure 27 has a choke structure 27A located at the top and extending in the left-right direction, a choke structure 27B located at the bottom and extending in the left-right direction (see Figure 13C), a choke structure 27C located on the left side and extending in the up-down direction, and a choke structure 27D located on the right side and extending in the up-down direction, and is formed all around the inside of the choke structure 26 along the top, bottom, left side and right side. Also, as shown in Figure 13C, when the length of the choke structures 27A and 27B in the left-right direction is L1 and the length of the choke structures 27C and 27D in the up-down direction is L2, L1 is set to > L2. In other words, the choke structures 27C and 27D are formed to be shorter than the choke structures 27A and 27B.

[0047] As shown in Figure 13A, the upper choke structure 27A and the lower choke structure 27B are integrally formed with the door base 21 (choke structure 26). "Integrated" means that they are constructed from a single sheet of steel by processes such as cutting, punching, bending, and drawing. Figure 13A shows the choke structures 27A and 27B in their unfolded state before bending. The dashed lines a, b, c, and d in Figure 13A indicate the bending lines, and Figure 13B shows the choke structures 27A and 27B after bending.

[0048] Figure 13C shows the state after the choke structure 27C located on the left side and the choke structure 27D located on the right side are attached to the door base 21. The choke structures 27C and 27D are bent and then connected to the left and right side plate portions 21d and right side plate portions 21d of the door base 21 by welding (spot welding). Multiple welds are formed at equal intervals along the plate portions 21d. In this way, the choke structures 27C and 27D are intermittently electrically connected to the door base 21. The pitch P between the welds (electrical connections) p1 and p2 is set to be less than or equal to 1 / 4 wavelength of the oscillation frequency of the microwave heating means 30. For example, if the frequency is 2.45 GHz, the pitch P is set to 31 mm or less. Note that the shorter the pitch P, the better the microwave shielding performance can be.

[0049] In the fourth embodiment, the case in which the choke structures 27C and 27D and the door base 21 are connected by welding was described as an example, but the connection is not limited to welding, and they can also be connected by crimping or screw fastening. Furthermore, the pitch between crimped parts and the pitch between screw fastening parts are set to be 1 / 4 wavelength or less of the oscillation frequency of the range heating means 30, as in the case of welding. In addition, the choke structures 27C and 27D and the door base 21 are not limited to a configuration in which they are intermittently electrically connected, but may also be configured in which they are continuously electrically connected by welding.

[0050] In this fourth embodiment, the choke structures 27C and 27D are made of separate components from the door base 21, and the choke structures 27C and 27D are intermittently electrically connected to the door base 21. This makes it possible to arrange the choke structures (27A to 27D) inside the choke structure 26 around its entire circumference.

[0051] Furthermore, in the fourth embodiment, the intermittently electrically connected welded joints p1 and p2 are welded. This allows for reliable and rapid formation of the electrical connection.

[0052] Furthermore, in the fourth embodiment, the pitch P of the intermittently electrically connected welds p1 and p2 is less than or equal to (1 / 4) wavelength of the oscillation frequency of the microwave heating means 30 (heat source). This ensures that microwaves are reliably blocked.

[0053] Furthermore, in the fourth embodiment, the upper and lower choke structures 27A and 27B are integrated with the door base 21, while the left and right choke structures 27C and 27D are made as separate parts from the door base 21. This reduces the number of electrical connection points by making the left and right choke structures 27C and 27D, which have shorter sides, into separate parts. As a result, performance stability is improved, and manufacturing costs can be reduced.

[0054] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are included. For example, in the first to third embodiments, a double-glazed glass with an inner glass and an outer glass was described as an example, but a single-glazed glass with a conductive member 43 laminated on the outer surface of the inner glass 41 may also be used.

[0055] Furthermore, in the fourth embodiment, the case in which the left and right choke structures 27C and 27D, which are part of the choke structure 27, are separate parts from the door base 21 was described as an example. However, the entire choke structure 27, consisting of the upper, lower, left, and right choke structures 27A to 27D, may also be configured as separate parts from the door base 21. In addition, the upper and lower choke structures 27A and 27B, which are part of the choke structure 27, may also be configured as separate parts from the door base 21.

[0056] Furthermore, although the second embodiment was described using a configuration in which the conductive member 43 and the plate portion 21d are in contact as an example, a configuration in which the conductive member 43 and the plate portion 21d are not in contact is also possible. [Explanation of symbols]

[0057] 1A,1B,1C Heating cooker 2 Heating chamber 3. Front plate of the heating chamber Doors 20A, 20B, 20C 21 Door Base 21a, 21b, 21c, 21d plate part 25 Exterior door glass 26 Choke structure 27 Chalk structure (another chalk structure) 27A, 27B Choke structure (integrated with door base) 27C, 27D Choke structure (separate part from the door base) 30. Microwave heating means (heat source) 40A, 40B, 40C Microwave Shielding Glass 41 Interior glass (glass) 42, 44, 45 Exterior glass (glass) 43 Conductive members 44a Outer edge (edge ​​of the glass on the outside of the storage unit) 50 Silicone sealant (sealant) 60. Welded joints (electrical connections) Pitch S1, S2, S3 gap

Claims

1. A heating chamber for containing the object to be heated, A heating source for microwave heating the object to be heated, The heating chamber is provided with a door that can be opened and closed, The door comprises a door base provided on the outer periphery of the door, The door has microwave shielding glass comprising transparent glass positioned opposite the heating chamber and a conductive member laminated on the glass, The aforementioned door base is provided with a choke structure. On the inner circumference side of the aforementioned choke structure, another choke structure is provided around the entire circumference, separate from the aforementioned choke structure. The door base has a plate portion that contacts the front plate of the heating chamber when the door is closed. The plate portion is located on the inner circumference side of the chalk structure portion. The other chalk structure is located on the inner circumference side of the plate portion. The microwave shielding glass is constructed by sandwiching the conductive member between an inner glass panel located on the heating chamber side and an outer glass panel located on the opposite side of the heating chamber, and bonding them together. The outer glass of the enclosure is formed to have a shorter outer circumference than the inner glass of the enclosure. The conductive member is exposed on the outer surface of the inner glass of the interior of the interior. The outer glass of the enclosure is positioned such that its end is located on the inner circumference side of the other chalk structure. The door base is in contact with the conductive member on the inner circumference side of the plate portion, with the outer peripheral edge of the conductive member sandwiched between the door base and the interior glass. A cooking appliance characterized in that a gap is formed between the plate portion at the tip of the other choke structure and the conductive member.

2. In the heating appliance described in claim 1, A cooking appliance characterized in that the outer glass of the oven cavity is thinner than the inner glass of the oven cavity.

3. In the heating appliance according to claim 1 or claim 2, A part or all of the aforementioned other choke structure is composed of a separate component from the door base, The cooking appliance is characterized in that the other choke structure is continuously or intermittently electrically connected to the door base.

4. In the heating appliance described in claim 3, A cooking appliance characterized in that the intermittently electrically connected electrical connections are welded, crimped, or screwed.

5. In the heating appliance described in claim 3, A cooking appliance characterized in that the pitch of the intermittently electrically connected electrical connections is less than or equal to (1 / 4) wavelength of the oscillation frequency of the heating source.

6. In the heating appliance described in claim 3, The upper and lower sides of the aforementioned other choke structure are integrated with the door base, A cooking appliance characterized in that the left and right sides of the aforementioned separate choke structure are made of parts separate from the door base.

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