Heating Regulator

Abstract

To provide a cooker in which microwave shielding glass can be grounded without impairing the visibility of an interior when microwave heating means is used.SOLUTION: A cooker comprises a heating chamber 2 for housing an object to be heated, range heating means for heating the object by microwaves, a door 20A capable of being opened / closed with respect to the heating chamber 2, and a door base 21 comprising a choke structure part 26 provided in an outer periphery of the door 20A. The door 20A comprises microwave shielding glass 40A comprising interior side glass 41 and exterior side glass 42 arranged opposite to the heating chamber 2, and a conductive member 43 arranged between the interior side glass 41 and the exterior side glass 42. The conductive member 43 is electrically connected to the door base 21.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a cooking device. [Background technology]

[0002] The cooking appliance is designed to heat and cook food placed in a heating chamber, and is provided with an openable door at the front of the main body casing to store the food in the main body. This door is provided with a viewing window to check the condition of the food in the heating chamber, and the viewing window is made of a metal plate (punched metal) with multiple punched holes to prevent microwaves from leaking out of 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 the inner and outer door glass, allowing cooking to be progressed while monitoring the cooking status. Patent Document 2 describes a structure in which part or all of the perforated metal is removed and a transparent conductor is used to improve visibility inside the refrigerator. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-60015 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-26092 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the specific structure for electrically connecting the conductive film is not considered in the cooking device described in Patent Document 1. Furthermore, the specific structure for electrically connecting the transparent conductor to the punched metal is not considered in the cooking device described in Patent Document 2. [Means for solving the problem]

[0006] The present invention provides a microwave-shielding glass comprising a heating chamber that accommodates an object to be heated, a heat source that microwave-heats the object to be heated, a door that can be opened and closed relative to the heating chamber, and a door base that is provided on the outer periphery of the door, wherein the door has a microwave-shielding glass that includes a transparent glass that is arranged opposite the heating chamber and a conductive member that is laminated on the glass, and the conductive member is electrically connected to the door base over the entire periphery. The microwave-shielding glass is configured by sandwiching the conductive member between an inside glass located on the heating chamber side and an outside glass located on the opposite side of the heating chamber and bonding them together, the outside glass being formed with a shorter outer periphery than the inside glass, the conductive member being exposed on the outside surface of the inside glass, and the outer periphery of the conductive member being pressed and fixed against the rear surface of the door base. It is characterized by: [Brief explanation of the drawings]

[0007] [Figure 1] 1 is an external perspective view of a cooking device according to a first embodiment; [Figure 2] 1 is a perspective view showing a state in which the door of the cooking device of the first embodiment is open. FIG. [Figure 3] 1 is a vertical cross-sectional perspective view of a cooking device according to a first embodiment. [Figure 4] 4 is a view taken in the direction of the arrow X in FIG. 3. [Figure 5] FIG. 2 is a cross-sectional perspective view showing the internal structure of the door of the cooking device of the first embodiment. [Figure 6] FIG. 2 is a perspective view showing a microwave-shielding glass of the cooking device according to the first embodiment. [Figure 7] FIG. 7 is an enlarged perspective view of a corner portion of the microwave shielding glass of FIG. 6. [Figure 8] FIG. 10 is a perspective view showing a microwave shielding glass according to another embodiment. [Figure 9] FIG. 9 is an enlarged perspective view of a corner of the microwave shielding glass of FIG. 8. [Figure 10] 2 is a cross-sectional view showing the internal structure of the door of the cooking device of the first embodiment. FIG. [Figure 11] FIG. 6 is a cross-sectional view showing the internal structure of a door of a cooking device according to a second embodiment. [Figure 12] FIG. 10 is a cross-sectional perspective view showing the internal structure of a door of a cooking device according to a second embodiment. [Figure 13] FIG. 10 is a cross-sectional view showing the internal structure of a door of a cooking device according to a third embodiment. [Figure 14]FIG. 10 is a cross-sectional view showing the internal structure of a door of a cooking device according to a fourth embodiment. [Figure 15] FIG. 10 is a cross-sectional perspective view showing the internal structure of a door of a cooking device according to a fifth embodiment. [Figure 16] FIG. 10 is a cross-sectional view showing the internal structure of a door of a cooking device according to a fifth embodiment. [Figure 17] FIG. 10 is a cross-sectional view showing the internal structure of a door of a cooking device according to a sixth embodiment. [Figure 18] FIG. 13 is a cross-sectional perspective view showing the internal structure of a door of a cooking device according to a seventh embodiment. [Figure 19] FIG. 13 is a cross-sectional view showing the internal structure of a door of a cooking device according to a seventh embodiment. [Figure 20] FIG. 13 is a cross-sectional perspective view showing the internal structure of a door of a cooking device according to an eighth embodiment. [Figure 21] FIG. 13 is a cross-sectional view showing the internal structure of a door of a cooking device according to an eighth embodiment. [Figure 22] FIG. 13 is a cross-sectional perspective view showing the internal structure of a door of a cooking device according to a ninth embodiment. [Figure 23] FIG. 13 is a cross-sectional view showing the internal structure of a door of a cooking device according to a ninth embodiment. [Figure 24] FIG. 23 is a cross-sectional perspective view showing the internal structure of a door of a cooking device according to a tenth embodiment. [Figure 25] FIG. 22 is a cross-sectional view showing the internal structure of the door of the cooking device according to the tenth embodiment. [Figure 26] FIG. 23 is a cross-sectional perspective view of the cooking device of the eleventh embodiment as viewed from the door side. [Figure 27] FIG. 20 is a cross-sectional perspective view of the cooking device of the eleventh embodiment as viewed from inside the oven. [Figure 28] FIG. 23 is a plan view showing a door of the cooking device according to the eleventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, a mode for carrying out the present invention (hereinafter referred to as "embodiment") will be described in detail with reference to the drawings as appropriate, with the direction shown in FIG.

[0009] (First embodiment) FIG. 1 is an external perspective view of a cooking device according to a first embodiment. As shown in Fig. 1, cooking appliance 1A is configured to include a main body 10 covered by a cabinet 11 that covers the outer periphery, and a door 20A that can be rotated on the front of main body 10. Door 20A includes a door base 21 (see Fig. 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 forms the outer periphery of the door 20 and is configured to surround the entire periphery of the door 20A from above, below, left, and right. The handle 23 is a grip used to open and close the door 20A and is formed integrally with the door frame 22 using a resin molded part. The operation panel 24 includes an operation unit and a display unit. The outer door glass 25 is made of a transparent glass plate and is fitted into the door frame 22.

[0011] Door 20A also prevents leakage of microwaves used to heat food, and confines the heat of the heater, enabling efficient heating.

[0012] FIG. 2 is a perspective view showing the cooking device of the first embodiment with the door open. As shown in Fig. 2, the cooking device 1A has a heating chamber 2 that stores food (not shown) inside the main body 10. The heating chamber 2 has a bottom plate 2a, a back plate 2b, a top plate 2c, a right side plate 2d, and a left side plate 2e, and has a rectangular opening formed in the front. Fig. 2 shows a state in which a tray is stored on the bottom plate 2a of the heating chamber 2.

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

[0014] Fig. 3 is a vertical cross-sectional perspective view of the cooking device of the first embodiment. Note that Fig. 3 does not show the cabinet 11 (see Fig. 1) and some of the components provided below the bottom plate 2a. 3, a door base 21 equipped with a choke structure 26 for preventing microwave leakage is provided inside the outer periphery of the door 20A (inside the door frame 22). The door base 21 forms the framework of the door 20A, and is made by processing a metal plate such as iron by cutting, punching, bending, drawing, and the like.

[0015] Choke structure 26 is formed around the entire outer periphery of door 20A. Note that Fig. 3 shows parts of choke structure 26 that extend horizontally at the top and bottom of door 20A, and does not show choke structure parts that extend vertically on the left and right sides of door 20A.

[0016] A microwave heating means 30 that operates when the food to be cooked is microwave-heated is provided below the bottom plate 2a. This microwave heating means 30 is composed of a magnetron that generates microwaves, a waveguide that sends the microwaves to the heating chamber 2, and the like. The cooking device 1A of this embodiment may also be equipped with oven heating means using a heater (not shown), and the like. The cooking device 1A of the first embodiment may be applied to a single-function type equipped with only the microwave heating means 30, or may be applied to an oven range type equipped with the microwave heating means 30, oven heating means, and the like.

[0017] Furthermore, the door 20A is provided with a transparent microwave-shielding glass 40A on the inside of the oven chamber from 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 cooking appliance 1A of the first embodiment does not include a punched metal that has conventionally been used to achieve both visibility inside the oven chamber and prevention of microwave leakage.

[0018] Fig. 4 is a view seen in the direction of the arrow X in Fig. 3. Fig. 4 shows the door 20A in a completely closed state, with the outer peripheral surface 20a of the door 20A in face-to-face contact with the heating chamber front plate 3 provided around the front opening of the heating chamber 2.

[0019] As shown in Fig. 4, microwave-shielding glass 40A is configured to include an inside glass 41 (glass) located on the heating chamber 2 side, an outside glass 42 (glass) located on the opposite side (outside) of the heating chamber 2, and a conductive member 43 provided between the inside glass 41 and the outside glass 42. The inside glass 41 and the outside glass 42 have the property of transmitting visible light, allowing the food to be cooked in the heating chamber 2 to be seen from outside the oven. The inside glass 41 and the outside glass 42 are fixed to each other via an adhesive, with the conductive member 43 sandwiched between them. In this way, microwave-shielding glass 40A is a double-glazed glass in which the inside glass 41 and the outside glass 42 are bonded and fixed together.

[0020] The inside glass 41 and the outside glass 42 are made of glass plates that are excellent in heat resistance and impact resistance, etc. The inside glass 41 and the outside glass 42 are both the same shape and are configured so that their four sides (top, bottom, left, and right) match each other.

[0021] The conductive member 43 may be a metal mesh made of metal warp threads and metal weft threads woven in a lattice pattern. The opening ratio of the metal mesh is set to be larger (for example, 70% or 78% or more) than the opening ratio of commonly used punched metal (for example, 50%). This allows for improved visibility when viewing the inside of the heating chamber 2 from outside the oven (outside the cooking appliance 1A) compared to when punched metal (a steel plate with multiple round holes formed in it) is used. The conductive member 43 is not limited to a transparent conductor such as ITO (indium tin oxide), and a colored conductor may also be used, as long as it does not impair visibility inside the heating chamber 2.

[0022] The use of a metal mesh for the conductive member 43 is also preferable in terms of detecting partial damage or peeling of the conductive member 43. The use of a metal mesh allows the conductive member 43 to be thinly visible without impairing visibility inside the heating chamber 2. Partial damage or peeling of the conductive member 43 is difficult to detect through a continuity test, so visual detection is required. However, if a transparent material that cannot be seen with the naked eye, such as the conductive film mentioned in the prior art, is used, it becomes difficult to detect partial damage or peeling. Therefore, it is preferable to use a material such as a metal mesh for the conductive member 43 that can be seen with the naked eye without impairing visibility inside the heating chamber 2 in terms of detecting partial damage or peeling of the conductive member 43.

[0023] Furthermore, the conductive member 43 is not limited to a metal mesh, and may be a metal printed in a grid (mesh) pattern. For example, a conductive member in paste form can be formed on the surface of the inside glass 41 or the surface of the outside glass 42 by screen printing.

[0024] FIG. 5 is a cross-sectional perspective view showing the internal structure of the door of the cooking device of the first embodiment. As shown in FIG. 5, choke structure 26 is formed by bending a metal plate, such as iron, multiple times and forming a comb-like shape along the circumferential direction. While FIG. 5 only shows a portion of the top of door 20A, choke structure 26 is actually formed continuously around the entire periphery of door 20A on the top, bottom, left, and right sides. A portion of door base 21 is in contact with heating chamber front plate 3. If door base 21 and heating chamber front plate 3 are in close contact with each other without any gaps, microwaves will not leak around door 20A. However, if door base 21 or heating chamber front plate 3 are heated to high temperatures, such as in an oven, the metal may expand, changing the flatness of the surface. In this case, a small gap may form between door base 21 and heating chamber front plate 3, potentially allowing microwaves to leak through the gap. Therefore, the choke structure 26 described above is provided around door base 21.

[0025] The door base 21 has a plate portion 21a extending downward from the front end of the choke structure 26 and a plate portion 21b extending rearward (toward the heating chamber front plate 3) from the lower end of the plate portion 21a. The door base 21 also has a plate portion 21c extending downward (toward 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 from the lower end of the plate portion 21c and then downward. The plate portion 21c contacts the heating chamber front plate 3 when the door is closed. The plate portion 21d is positioned opposite the outer surface of the outer peripheral edge of the exterior glass 42. Note that while FIG. 5 only shows a portion of the upper portion of the door 20A, the door base 21 is formed continuously around the entire periphery of the upper, lower, left, and right sides of the door 20A, similar to the choke structure 26.

[0026] Fig. 6 is a perspective view showing the microwave-shielding glass of the cooking appliance of the first embodiment, and Fig. 7 is an enlarged perspective view of a corner of the microwave-shielding glass of Fig. 6. Note that Fig. 6 does not show the right half of the microwave-shielding glass 40A. In Fig. 6, the two-dot chain line indicates the shape of the conductive member 43 before folding.

[0027] As shown by the two-dot chain line in Fig. 6, the microwave-shielding glass 40A is formed so that the conductive member 43 protrudes outward from between the inside glass 41 and the outside glass 42. Furthermore, the microwave-shielding glass 40A has rectangular notches 43S formed at the corners of the conductive member 43.

[0028] 6, in the microwave-shielding glass 40A, the conductive member 43A protruding from the upper edges of the inside glass 41 and the outside glass 42 is bent forward at the upper edge of the outside glass 42 and then bent downward at the front end surface of the outside glass 42. In the microwave-shielding glass 40A, the conductive member 43B protruding from the left edges of the inside glass 41 and the outside glass 42 is bent forward at the left edge of the outside glass 42 and then bent rightward at the front end surface of the outside glass 42. In the microwave-shielding glass 40A, the conductive member 43C protruding from the lower edges of the inside glass 41 and the outside glass 42 is bent forward at the lower edge of the outside glass 42 and then bent upward at the front end surface of the outside glass 42. Although not shown, in the microwave-shielding glass 40A as well, the conductive member 43 protruding from the right edge portions of the inside glass 41 and the outside glass 42 is bent forward at the right edge portion of the outside glass 42, and then bent leftward at the front end face of the outside glass 42.

[0029] The conductive member 43A is folded forward so as to overlap the outer peripheral edge of the front end surface of the outside cabinet glass 42. The conductive member 43B is folded back so as to overlap the outer peripheral edge of the front end surface of the outside cabinet glass 42. The conductive members 43A and 43B then partially overlap at the corners. Although not shown, the other three corners are also folded in the same manner as above, with the protruding conductive members 43 overlapping. In this way, by using the conductive member 43 having the notches 43S formed at the corners, the conductive member 43 can be easily bent, and the productivity of the microwave shielding glass 40A can be improved.

[0030] Fig. 8 is a perspective view showing a microwave-shielding glass of another embodiment, and Fig. 9 is an enlarged perspective view of a corner of the microwave-shielding glass of Fig. 8. Note that the two-dot chain line in Fig. 8 indicates the shape of the conductive member 43 before folding. As shown by the two-dot chain line in Fig. 8, microwave-shielding glass 40B differs in that the shape of conductive member 43 before folding does not have notches 43S shown in Fig. 6. The width of conductive member 43 protruding from inside glass 41 and outside glass 42 is the same as in Figs. 6 and 7.

[0031] 9, in microwave-shielding glass 40B, conductive members 43E protruding from the upper edges of inside glass 41 and outside glass 42 are bent forward at the upper edges of outside glass 42 and then bent downward at the front end surface of outside glass 42. Then, conductive members 43F protruding from the left edges of inside glass 41 and outside glass 42 are folded back. Note that the corners are folded so that the overlapping conductive members 43 do not protrude outward.

[0032] In this way, the microwave-shielding glass 40B shown in Figs. 8 and 9 can cover the entire outer peripheral edge of the oven exterior glass 42 with the conductive member 43, and therefore can reduce the risk of microwave leakage more than the microwave-shielding glass 40A.

[0033] FIG. 10 is a cross-sectional view showing the internal structure of the door of the cooking device of the first embodiment. As shown in FIG. 10 , the outer peripheral edge 43s of the conductive member 43A, bent forward, is positioned so as to overlap the outer peripheral surface 42a of the outer glass 42, which faces forward. The outer peripheral edge 43s of the conductive member 43A is also positioned so as to overlap the front surface of the plate 21d of the door base 21. The outer peripheral edge 43s of the conductive member 43A is fixed to the door base 21 while being pressed against the rear surface 21d1 of the plate 21d from the inside of the oven (the heating chamber 2 side). That is, by applying a silicone sealant 50 (sealant) across the conductive member 43A (the conductive member 43 protruding outward from the inner glass 41 and the outer glass 42) and the door base 21 (the plate 21c, 21d), the outer peripheral edge 43s of the conductive member 43A is fixed in close contact with the plate 21d of the door base 21. The silicone sealant 50 has heat resistance, adhesive properties, and the like.

[0034] Although not shown, the silicone sealant 50 is continuously applied to the entire upper, lower, left, and right edges (periphery) of the microwave-shielding glass 40A. This electrically connects the conductive member 43 provided on the microwave-shielding glass 40A to the door base 21 (choke structure 26). The door base 21 is then grounded via the main body 10 (housing).

[0035] As described above, the cooking appliance 1A of the first embodiment includes the heating chamber 2 that accommodates an object to be heated, a microwave heating means 30 that microwaves the object to be heated, a door 20A that can be opened and closed relative to the heating chamber 2, and a door base 21 that is provided on the outer periphery of the door 20A. The door 20A has microwave-shielding glass 40A that includes an inner glass 41 and an outer glass 42 that are arranged opposite the heating chamber 2, and a conductive member 43 that is laminated on the inner glass 41 and the outer glass 42. The conductive member 43 is electrically connected to the door base 21 around the entire periphery. As a result, the conductive member 43 of the microwave-shielding glass 40A is electrically connected to the door base 21, and therefore microwaves leaking from the glass (the inner glass 41 and the outer glass 42) can be suppressed.

[0036] In the first embodiment, the conductive member 43 is a metal mesh formed in a mesh shape. This allows for a higher opening rate than commonly used punched metal, which improves visibility when looking into the heating chamber 2 from outside with the door 20A closed. As a result, the cooking status of the food in the heating chamber 2 can be more clearly recognized.

[0037] Furthermore, in the first embodiment, the conductive member 43 may be formed in a mesh shape by printing metal, in other words, a mesh-shaped metal film. This makes it easier to form a mesh shape than a woven shape such as a metal mesh, and it is possible to increase the productivity of the conductive member 43.

[0038] Furthermore, in the first embodiment, the conductive member 43 is continuously connected to the entire periphery of the door base 21. This makes it possible to more reliably prevent microwave leakage.

[0039] Moreover, in the first embodiment, the microwave-shielding glass 40A is configured by sandwiching and bonding the conductive member 43 between the inside glass 41 located on the heating chamber 2 side of the conductive member 43 and the outside glass 42 located on the opposite side of the heating chamber 2. By bonding and fixing the inside glass 41 and the outside glass 42 together, it is possible to prevent the glass from scattering when broken due to an impact or the like.

[0040] In the first embodiment, the conductive member 43 and the door base 21 are fixed with a silicone sealant 50. This allows the conductive member 43 and the door base 21 to be fixed in a tightly contacted state, making it possible to more reliably suppress microwave leakage and prevent foreign matter from entering the door 20A through a gap between the microwave-shielding glass 40A and the door base 21.

[0041] Furthermore, in the first embodiment, the door 20A does not include a punched metal, which allows the door 20A to be lighter in weight and improves operability.

[0042] (Second embodiment) Fig. 11 is a cross-sectional view showing the internal structure of the door of the cooking device of the second embodiment. Fig. 12 is a cross-sectional perspective view showing the internal structure of the door of the cooking device of the second embodiment. Note that the same components as those of the first embodiment are given the same reference numerals and redundant explanations will be omitted (the same applies to the third and subsequent embodiments). As shown in Fig. 11, the cooking appliance 1B of the second embodiment has a door 20B equipped with a microwave-shielding glass 40C. The microwave-shielding glass 40C is configured to include an inside glass 41, an outside glass 42, and a conductive member 43. The microwave-shielding glass 40C also has an outer peripheral edge portion 43t that protrudes vertically upward from the upper edge portions (outer peripheral edges) of the inside glass 41 and the outside glass 42. The outer peripheral edge portion 43t protrudes to a position where it overlaps with the plate portion 21c of the door base 21. The outer peripheral edge portion 43t extends to a position where it does not overlap with the heating chamber front plate 3.

[0043] The outer peripheral edge 43t of the conductive member 43 is fixed via the silicone sealant 50 in a state in which the microwave-shielding glass 40C is pressed against the door base 21 (the rear surface of the plate portion 21c) from the inside of the refrigerator.

[0044] 12, the plate portion 21c of the door base 21 and the outer peripheral edge portion 43t of the conductive member 43 are fixed by welding. That is, welds (electrical connection portions, earth points) 60 formed by spot welding are formed intermittently along the circumferential direction of the door base 21. Although not shown, the welds 60 are formed intermittently not only on the upper portion of the microwave shielding glass 40C but also on the lower portion, left side portion, and right side portion all along the circumferential direction. Note that the method of connecting the plate portion 21c and the outer peripheral edge portion 43t is not limited to welding, and may be crimping or screw fastening, and can be selected as appropriate.

[0045] The distance (pitch P) between the welds 60 is set to be equal to or less than ¼ of the wavelength of the oscillation frequency of the microwave heating means 30. For example, when the frequency is 2.45 GHz, the pitch P is set to be equal to or less than 31 mm. The shorter the pitch P, the higher the microwave blocking ability.

[0046] The welded portion 60 is not limited to being formed intermittently, but may be formed continuously in the circumferential direction.

[0047] In the second embodiment configured as described above, the conductive member 43 is connected discontinuously around the entire periphery to the door base 21. This makes manufacturing easier and less expensive than when the conductive member is formed continuously around the entire periphery.

[0048] In the second embodiment, the intermittently connected welded portions 60 are formed by welding, which allows the electrical connection to be formed reliably and quickly.

[0049] Furthermore, in the second embodiment, the pitch of the welded portions 60 that are intermittently connected is equal to or less than (1 / 4) the wavelength of the oscillation frequency of the microwave heating means 30. This makes it possible to reliably block microwaves.

[0050] (Third embodiment) FIG. 13 is a cross-sectional view showing the internal structure of the door of the cooking device according to the third embodiment. As shown in FIG. 13, a cooking appliance 1C of the third embodiment has a door 20C in which a silicone sealant 51 (conductive sealant) is used instead of the silicone sealant 50 of the first embodiment. Unlike the silicone sealant 50 of the first embodiment, this silicone sealant 51 is conductive. For example, the silicone sealant 51 is made by mixing a conductive material such as carbon black into silicone resin. As in the first embodiment, the outer peripheral edge 43s of the conductive member 43A is fixed to the door base 21 while being pressed against the rear surface of the plate portion 21d from the inside (heating chamber 2 side). This electrically connects the conductive member 43 and the door base 21.

[0051] In the third embodiment configured as described above, the conductive member 43 and the door base 21 are fixed together with the conductive silicone sealant 51. This allows for a more reliable electrical connection than the silicone sealant 50 of the first embodiment.

[0052] (Fourth embodiment) FIG. 14 is a cross-sectional view showing the internal structure of the door of the cooking device according to the fourth embodiment. 14, a cooking appliance 1D of the fourth embodiment includes a door 20D in which a microwave-shielding glass 40D is used instead of the microwave-shielding glass 40A of the first embodiment. The microwave-shielding glass 40D includes an inside glass 41, an outside glass 44, and a conductive member 43.

[0053] The outer periphery of the exterior glass 44 is shorter than the interior glass 41, and is slightly smaller in outer diameter than the interior glass 41. The exterior glass 44 is laminated so that it does not protrude from the exterior glass 41, and a step 40a is formed between the exterior glass 44 and the interior glass 41. The outer periphery of the conductive member 43 is larger than the outer periphery of the exterior glass 44. As a result, the outer periphery 43u of the conductive member 43 is exposed at the step 40a and faces the outside of the cabinet. The plate portion 21d of the door base 21 is set to a length that does not come into contact with the exterior glass 44.

[0054] 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, the outer peripheral edge 43u is exposed on four sides of the inside glass 41, namely the top, bottom, left side, and right side, and is in contact with the entire periphery of the door base 21 and is electrically connected.

[0055] In the fourth embodiment configured in this manner, the outer periphery of the outside cabinet glass 44 is shorter than that of the inside cabinet glass 41, and the conductive member 43 is exposed on the outside surface of the inside cabinet glass 41. This eliminates the need to position the conductive member 43 so that it protrudes from the inside cabinet glass 41 or the outside cabinet glass 44, so the conductive member 43 can be stably pressed against the door base 21 (plate portion 21d), ensuring a reliable electrical connection.

[0056] (Fifth embodiment) FIG. 15 is a cross-sectional perspective view showing the internal structure of the door of the cooking device of the fifth embodiment, and FIG. 16 is a cross-sectional view showing the internal structure of the door of the cooking device of the fifth embodiment. As shown in Fig. 15, the cooking appliance 1E of the fifth embodiment is provided with a door 20E in which another choke structure 27 is added to the cooking appliance 1A of the first embodiment. Like choke structure 26, this choke structure 27 blocks microwaves leaking from the heating chamber 2, and is formed integrally with the door base 21. This choke structure 27 is provided inside choke structure 26 which is provided on the outer periphery of the door 20E. In other words, choke structure 27 is located between the outer door glass 25 and the outer periphery of the microwave shielding glass 40A.

[0057] Choke structure 27, like choke structure 26, is formed by bending an iron metal plate multiple times and forming a comb-like shape along the circumferential direction. Although Fig. 15 only shows a portion of the upper part of door 20E, choke structure 27 is formed over the entire periphery of the upper, lower, left side, and right side of door 20E.

[0058] 16, choke structure 27 is formed continuously with the lower end of plate portion 21d of door base 21. That is, choke structure 27 has plate portion 27a extending forward from the lower end of plate portion 21d, plate portion 27b extending vertically downward from the front end of plate portion 27a, plate portion 27c extending rearward from the lower end of plate portion 27b, plate portion 27d extending vertically upward from the rear end of plate portion 27c for a shorter length than plate portion 27b, and plate portion 27e extending forward for a short length from the upper end of plate portion 27d.

[0059] 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 the outer glass 42.

[0060] Furthermore, since the choke structure 27 is located on the outer periphery of the microwave shielding glass 40A, it is possible to prevent impairment of visibility when looking at the inside of the heating chamber 2 from outside the oven.

[0061] In the fifth embodiment configured as described above, a choke structure 27 separate from the choke structure 26 is provided inside the choke structure 26. This makes it possible to further suppress leakage of microwaves from the heating chamber 2.

[0062] In the fifth embodiment, an example has been described in which choke structure 27 is integrated with door base 21, but choke structure 27 and door base 21 may be configured as separate parts (separate bodies). In this case, choke structure 27 and door base 21 can be connected by welding, crimping, or screwing. The pitch between welded portions, the pitch between crimped portions, and the pitch between screwed portions are set to be equal to or less than ¼ wavelength of the oscillation frequency of microwave heating means 30.

[0063] (Sixth embodiment) FIG. 17 is a cross-sectional view showing the internal structure of the door of the cooking device according to the sixth embodiment. 17, a cooking appliance 1F of the sixth embodiment includes a door 20F in which a choke structure 28 is added as another choke structure to the microwave-shielding glass 40D of the fourth embodiment. The choke structure 28 is formed integrally with the door base 21.

[0064] The choke structure 28 includes a plate portion 28a extending forward from the lower end of the plate portion 21d, a plate portion 28b extending vertically downward from the front end of the plate portion 28a, a plate portion 28c extending rearward from the lower end of the plate portion 28b, a plate portion 28d extending vertically upward from the rear end of the plate portion 28c, a shorter plate portion than the plate portion 28b, and a plate portion 28e extending forward from the upper end of the plate portion 28d. The plate portions 28a, 28b, 28d, and 28e are configured similarly to the plate portions 27a, 27b, 27d, and 27e of the fifth embodiment. The plate portion 28c is shorter than the plate portion 27c of the fifth embodiment by at least the thickness of the exterior glass 44. This forms a gap S2 between the plate portion 28d of the choke structure 28 and the exterior glass 44. In this way, the choke structure 28 can prevent the outer glass 44 from being damaged.

[0065] (Seventh embodiment) Fig. 18 is a cross-sectional perspective view showing the internal structure of the door of the cooking device of the seventh embodiment.Fig. 19 is a cross-sectional view showing the internal structure of the door of the cooking device of the seventh embodiment. 18, the cooking appliance 1G of the seventh embodiment has a door 20G equipped with a choke structure 29 that is in addition to the choke structures 26, 27, and 28. The choke structure 29 has upper and lower choke structures 29a and 29b (a so-called double choke structure), and is formed integrally with the door base 21.

[0066] As shown in Fig. 18, choke structure 29a is located lower (inner) than choke structure 29b and is formed in a comb-teeth shape along the circumferential direction. Choke structure 29b is formed where the comb teeth of choke structure 29a are missing and is also formed in a comb-teeth shape along the circumferential direction. By providing such choke structure 29, it is possible to improve the microwave blocking performance compared to single-stage choke structures 27, 28. Furthermore, by using choke structure 29, it is possible to increase the tolerance for product variations.

[0067] As shown in Figure 19, choke structure 29 is located inside outer peripheral edge 43s of conductive member 43. A gap S3 is formed between choke structure 29a and outer cabinet glass 42. A gap S4 is formed between choke structure 29b and outer cabinet glass 42. This prevents the choke structure 29 from scratching the outer cabinet glass 42.

[0068] In the seventh embodiment, an example has been described in which choke structure 29 is formed integrally with door base 21. However, as described in the fifth embodiment, choke structure 29 and door base 21 may be configured as separate parts (separate bodies). In this case, choke structure 29 and door base 21 are connected to each other by welding, crimping, or screwing. The pitch between welded portions, the pitch between crimped portions, and the pitch between screwed portions are set to be equal to or less than ¼ wavelength of the oscillation frequency of microwave heating means 30.

[0069] (Eighth embodiment) Fig. 20 is a cross-sectional perspective view showing the internal structure of the door of the cooking device of the eighth embodiment.Fig. 21 is a cross-sectional view showing the internal structure of the door of the cooking device of the eighth embodiment. 20 , a cooking appliance 1H of the eighth embodiment includes a door 20H in which a microwave-shielding glass 40E is used instead of the microwave-shielding glass 40D of the fourth embodiment. The microwave-shielding glass 40E includes an inside glass 45, an outside glass 42, and a conductive member 43.

[0070] The inside glass 45 has a shorter outer periphery than the outside glass 42 and is slightly smaller in outer shape than the outside glass 42. The inside glass 45 is located inside the outer periphery of the outside glass 42, and a step 40b is formed between the outside glass 42 and the inside glass 45. An outer peripheral edge 43v of the conductive member 43 is exposed at this step 40a. The conductive member 43 is configured so as not to protrude outside the outside glass 42.

[0071] The door 20H also includes a holding member 70 for holding the microwave-shielding glass 40E. The holding member 70 includes a holding plate 70a arranged along the plate 21a of the door base 21, a holding plate 70b arranged along the plate 21b, a holding plate 70c arranged along the plate 21c, and a holding plate 70d arranged along the plate 21d. For example, the holding plate 70a is fixed to the plate 21a by welding, crimping, screwing, or the like. The holding member 70 may also be fixed by fastening the plate 21a of the door base 21 and the holding plate 70a together to a resin member of the door frame 22 using screws.

[0072] 21 , with the outer peripheral surface of the outside-cabinet glass 42 pressed against the rear surface of the holding plate portion 70d of the holding member 70 and the plate portion 21d of the door base 21 pressed against the outer peripheral edge portion 43v of the conductive member 43, the microwave-shielding glass 40E is fixed to the door base 21 using a silicone sealant 50. The silicone sealant 50 is applied across the plate portion 21d of the door base 21 and the inside-cabinet glass 45.

[0073] The eighth embodiment configured in this manner is equipped with a holding member 70 that presses and holds the exterior glass 42. The interior glass 45 is formed with a shorter outer periphery than the exterior glass 42, and the conductive member 43 is exposed on the interior side (heating chamber 2 side) of the exterior glass 42. As a result, even if the exterior glass 42 is formed larger than the interior glass 45 and the exposed conductive member 43 (outer peripheral edge 43v) faces the interior side, the door base 21 can be fixed by pressing it against the conductive member 43, and an electrical connection can be obtained.

[0074] (Ninth embodiment) Fig. 22 is a cross-sectional perspective view showing the internal structure of the door of the cooking device of the ninth embodiment.Fig. 23 is a cross-sectional view showing the internal structure of the door of the cooking device of the ninth embodiment. As shown in Fig. 22, a cooking appliance 1I of the ninth embodiment has a door 20I equipped with a microwave-shielding glass 40F made of a single-layer glass 46 (glass). The microwave-shielding glass 40F has a transparent single-layer glass 46 and a conductive member 43 provided on the outer surface of the single-layer glass 46. The outer peripheral edges of the single-layer glass 46 and the conductive member 43 are shaped to coincide with each other. The single-layer glass 46 is similar to the inner-side glass 41 and the outer-side glass 42 used in the microwave-shielding glass 40A.

[0075] 23, the microwave-shielding glass 40F is arranged with the conductive member 43 facing the outside of the oven (the side opposite to the heating chamber 2). The conductive member 43 is also arranged in the space Q between the single-layer glass 46 and the outer door glass 25. The conductive member 43 is fixed via a silicone sealant (not shown) with the outer peripheral edge 43w of the conductive member 43 pressed against the rear surface of the plate portion 21d of the door base 21.

[0076] In the ninth embodiment configured as described above, the door 20I is provided with a transparent outer door glass 25 that is arranged on the outer side of the microwave-shielding glass 40F. The microwave-shielding glass 40F is a single-layer glass 46. A conductive member 43 is provided on the outer surface of the single-layer glass 46. As a result, the conductive member 43 is located in the sealed space Q between the outer door glass 25 and the single-layer glass 46, and therefore, the conductive member 43 (metal mesh, etc.) can be prevented from being damaged. Furthermore, using a single-layer glass 46 allows the microwave-shielding glass 40F to be made lighter, which in turn enables the door 20I to be made lighter.

[0077] (Tenth embodiment) Fig. 24 is a cross-sectional perspective view showing the internal structure of the door of the cooking device of the tenth embodiment.Fig. 25 is a cross-sectional view showing the internal structure of the door of the cooking device of the tenth embodiment. As shown in Fig. 24, a cooking appliance 1J of the tenth embodiment includes a door 20J in which a choke structure 27 is added to the door 20I of the ninth embodiment. The choke structure 27 is similar to the choke structure 27 of the fifth embodiment.

[0078] 25, a gap S5 is formed between conductive member 43 and plate portion 27d of choke structure 27. This prevents conductive member 43 from being damaged by choke structure 27. Note that in FIGS. 24 and 25, the silicone sealant that fixes conductive member 43 in a pressed state against plate portion 21d is not shown.

[0079] (Eleventh embodiment) Figure 26 is a cross-sectional oblique view of the internal door structure of the heating cooker of the 11th embodiment when viewed from the door side, Figure 27 is a cross-sectional oblique view of the internal door structure of the heating cooker of the 11th embodiment when viewed from the inside of the oven, and Figure 28 is a plan view showing the door structure of the heating cooker of the 11th embodiment. As shown in Figures 26 and 27, the heating cooker 1K of the 11th embodiment includes a heating chamber 2 that accommodates an object to be heated, a range heating means 30 (heat source) that microwaves the object to be heated, a door 20K that can be opened and closed relative to the heating chamber 2, an outer door glass 91 and an inner door glass 92 provided on the outside and inside of the door 20K, and a door base 21.

[0080] At least one of the outer door glass 91 and the inner door glass 92 is made of double-glazed glass. That is, of the outer door glass 91 and the inner door glass 92, only the outer door glass 91 may be made of double-glazed glass, or only the inner door glass 92 may be made of double-glazed glass, or both may be made of double-glazed glass. Note that double-glazed glass is obtained by fixing two or more glass sheets together with an adhesive.

[0081] The perforated metal 93 is formed integrally with the door base 21 and is electrically connected to it. As shown in Figure 28, the perforated metal 93 is an iron plate with multiple round holes arranged on all four sides.

[0082] However, there is a problem that glass may shatter if the cooking appliance is dropped or if the door glass is subjected to an impact. Therefore, by using the configuration of the eleventh embodiment in which at least one of the outer door glass 91 and the inner door glass 92 is made of double-glazed glass, it is possible to prevent glass from shattering due to a drop or impact.

[0083] The present invention is not limited to the above-described embodiment, but includes various modifications. For example, the first embodiment and the tenth embodiment may be combined as appropriate. [Explanation of symbols]

[0084] 1A~1I heating cooker 2 Heating chamber 3 Heating chamber front panel 20A~20I Doors 21 Door base 21a, 21b, 21c, 21d plate part 25 Outer door glass 26 Choke structure 27,28 Choke structure (another choke structure) 29 Choke structure (two-stage choke structure) 30 Microwave heating means (heat source) 40A~40F Microwave shielding glass 41,45 Interior glass (glass) 42,44 Outside glass (glass) 43 Conductive materials 43s, 43t, 43u, 43v, 43w outer edge 46 Single-glazed (glass) 50 Silicone sealant (sealant) 51 Silicone sealant (conductive sealant) 60 Welded parts (electrical connections) 70 Retaining member Pitch Q Space S5 Gap

Claims

1. a heating chamber that accommodates an object to be heated; A heat source that microwaves the object to be heated; a door that can be opened and closed relative to the heating chamber; a door base provided on the outer periphery of the door, the door has a microwave-shielding glass including a transparent glass arranged facing the heating chamber and a conductive member laminated on the glass, The conductive member is electrically connected to the door base over the entire periphery, the microwave-shielding glass is configured by sandwiching the conductive member between an inside glass located on the heating chamber side and an outside glass located on the opposite side to the heating chamber and bonding them together, The outer periphery of the outer glass is shorter than that of the inner glass, the conductive member is exposed on the outer surface of the inner glass, and the outer peripheral edge of the conductive member is pressed and fixed against the rear surface of the door base.

2. In the heating cooker according to claim 1, The door base is provided with a choke structure, A cooking device characterized in that a choke structure other than the choke structure is additionally provided inside the choke structure.

3. In the heating cooker according to claim 2, The other choke structure is a choke structure arranged in two stages, an inner stage and an outer stage, with respect to a surface direction of the glass, A cooking device characterized in that inner choke structures and outer choke structures are formed alternately along the circumferential direction.

4. In the heating cooker according to claim 2 or claim 3, The cooking device according to claim 1, wherein the other choke structure is disposed with a gap between it and the conductive member.

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