JPH06104083A - Microwave oven - Google Patents

Abstract

PURPOSE:To minimize the dead angle area so that the inner part of a heating cooking chamber can be sufficiently visually confirmed through a door by an user. CONSTITUTION:In a microwave oven in which an inner barrier 21 formed of a punching plate 25 and a glass plate 26 is mounted on the door frame 20 of a door 14 for opening and closing the front opening part 13 of a heating cooking chamber 12, side parts of a punching part 27 formed on the punching plate 25 is extended nearly to the edge part 31 of the front opening part 13 of the heating cooking chamber 12. Thus, the dead angle area can be minimized as much as possible, and the edge part of the glass plate 26 is arranged between the frame plate part 28 of the punching plate 25 and the front opening edge part 31 of the heating cooking chamber 12. Thus, leakage of microwaves from the door 14 can be much more prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven having an improved door structure for opening and closing a front opening of a cooking chamber.

[0002]

2. Description of the Related Art In a conventional microwave oven, as shown in FIG. 8, a door 3 for opening and closing a front opening 2 of a heating and cooking chamber 1.
Is composed of a door frame 4 and an inner barrier 5 which is a radio wave shield. The barrier 5 is the punching plate 6
And a glass plate 7 attached to the surface of the punching plate 6 on the heating cooking chamber 1 side. Further, an outer barrier 8 and a door sash 9 made of a glass plate are attached to the front surface portion and the outer peripheral portion of the door frame 4.

Punching plate 6 for the inner barrier 5
Is a punching portion 6a in which a large number of holes are formed, a frame-shaped plate portion 6b that surrounds the outer periphery of the punching portion 6a, and a stepwise outward extension of the outer periphery of the frame-shaped plate portion 6b. And a contact piece portion 6c. In this case, the glass plate 7 is bonded to the frame-shaped plate portion 6b via the adhesive 10. In the above-described conventional configuration, the user can view the inside of the heating and cooking chamber 1 with the door 3 closed through the outer barrier 8, the punching portion 6a, and the glass plate 7 of the door 3.

[0004]

However, in the above-mentioned conventional configuration, the side of the punching portion 6a is located inside the edge of the front opening 2 of the cooking chamber 1, so that the user can There is a problem that the invisible area, that is, the blind spot area is considerably large, and the inside of the heating and cooking chamber 1 cannot be sufficiently viewed.

Therefore, an object of the present invention is to provide a microwave oven in which the blind spot area can be made small when the user visually recognizes the inside of the cooking chamber through the door, and the inside of the cooking chamber can be sufficiently recognized. is there.

[0006]

The microwave oven of the present invention comprises:
A microwave oven comprising a door frame for opening and closing a front opening of the cooking chamber, a door frame, and a radio wave shield having a punching plate and a glass plate attached to the surface of the punching plate on the heating cooking chamber side. In the configuration, the side portion of the punching portion formed on the punching plate is configured to be widened to approximately the edge of the front opening of the heating and cooking chamber, and the frame-shaped plate portion of the punching plate and the heating and cooking chamber are provided. It is characterized in that the edge portion of the glass plate is disposed between the edge portion of the front opening and the edge portion of the front opening.

In this case, the four sides of the punching section are
All may be configured so as to extend to almost the edge of the front opening of the heating and cooking chamber.

Further, the three sides of the punching portion excluding the lower side portion are configured to be widened to substantially the edge portion of the front opening of the heating and cooking chamber, and the lower side portion of the punching portion is heated. It is also conceivable to configure it so as to fit in the vicinity of the lowermost shelf plate housed in the cooking chamber.

[0009]

According to the above means, the side portion of the punching portion is
Since the front opening of the cooking chamber is widened to almost the edge, the blind spot area is reduced, and the user can visually recognize the cooking chamber through the door sufficiently well. And in this case,
Since the edge portion of the glass plate is disposed between the frame-shaped plate portion of the punching plate and the front opening edge portion of the heating and cooking chamber, since the microwave can be absorbed by the glass plate, leakage of microwaves from the door is prevented. It can be prevented further.

Further, if the four sides of the punching portion are all spread to almost the edge of the front opening of the cooking chamber, there is almost no blind spot, and the visibility in the cooking chamber is greatly improved.

By the way, for example, in a microwave oven with a heater having a function of baking bread, dust such as bread crumbs accumulates on the inner bottom of the heating and cooking chamber. It may be noticeable and annoying. Further, when garbage such as bread crumbs is carbonized, when cooking with microwaves, small sparks are generated, and the sparks are visible, which may cause anxiety. On the other hand, the three sides of the punching section, excluding the lower side, are configured to extend to almost the edge of the front opening of the cooking chamber, and the lower side of the punching section is housed in the cooking chamber. If the inner bottom portion of the heating and cooking chamber is made difficult to see, the dust and sparks accumulated on the inner bottom portion are almost invisible if the inner bottom portion of the heating and cooking chamber is made visible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 2 showing the overall configuration of the microwave oven, inside the microwave oven main body 11,
A cooking chamber 12 is provided. This cooking room 12
The front opening 13 is configured to be opened and closed by a door 14.

A machine room (not shown) is provided on the right side of the cooking chamber 12 in the range main body 11, and a magnetron, its drive circuit, and a cooling fan device (none are shown) are provided in the machine room. Etc. are provided. The magnetron is a microwave cooking chamber 12
It is supplied to the inside of the cooking chamber 12 to heat the cooking product housed in the cooking chamber 12 with high frequency. Further, an operation panel 15 is provided on the right front side of the range main body 11. The operation panel 15 is provided with a display unit 16 for displaying the type and time of cooking, and various switches 17 for performing operations such as setting a cooking course, starting cooking and canceling cooking. There is.

On the other hand, on the inner bottom of the heating and cooking chamber 12, a drive shaft 18 for rotationally driving a rotary table (not shown) on which the food is placed is provided so as to project upward. The drive shaft 18 is configured to be rotationally driven by a motor (not shown). The rotary table is detachably connected to the upper end of the drive shaft 18.

As shown in FIG. 2, the door 14 is provided with a rectangular transparent window 19 so that the inside of the cooking chamber 12 can be seen through the transparent window portion 19. . Here, the configuration of the door 13, in particular, the configuration of the transparent window portion 19 will be described in detail below with reference to FIGS. 1, 3, 4, and 5.

First, as shown in FIG. 1, the door 14 has a metal door frame 20 and an inner barrier 21 which is a radio wave shield. An outer barrier 22 and a door sash 23 made of a glass plate are attached to the front surface portion and the outer peripheral portion of the door frame 20. Further, a flange portion 24 is formed on the inner periphery of the door frame 20 located inside the outer barrier 22 over the entire periphery thereof.

On the other hand, the inner barrier 21 is composed of a punching plate 25 and a glass plate 26 attached to the surface of the punching plate 25 on the heating and cooking chamber 12 side. The punching plate 25 has a punching portion 27 in which a large number of holes are formed, a frame-shaped plate portion 28 that surrounds the outer periphery of the punching portion 27, and a stepped outer surface of the frame-shaped plate portion 28 that is outwardly stepped. And extended contact piece 2
It is composed of 9 and 9. In this case, the punching plate 25 is integrally provided on the door frame 20 by, for example, welding and fixing the front surface portion of the frame-shaped plate portion 28 to the rear surface portion of the flange portion 24 of the door frame 20. Further, the glass plate 26 is bonded to the rear surface of the frame-shaped plate portion 28 of the punching plate 25 with, for example, a silicone adhesive 30.

Here, the punching portion 27 of the punching plate 25 is constructed so that all four sides thereof extend to almost the edge of the front opening 13 of the cooking chamber 12 (see FIGS. 3 and 4). The edge portion of the glass plate 26 is arranged between the frame-shaped plate portion 28 of the punching plate 25 and the front plate portion 31 which is the front opening edge portion of the heating and cooking chamber 12. Further, on the rear surface side of the frame-shaped plate portion 28, a convex portion 28a is provided so as to project rearward so that the glass plate 26 floats slightly rearward from the rear surface of the frame-shaped plate portion 28 by this convex portion 28a. It is configured.

On the other hand, the door frame 20 and the punching plate 2
The choke groove 32 is formed by the space surrounded by the contact piece 29 of FIG. This choke groove 32 is
This is a so-called slit choke groove, and as shown in FIG. 5, a large number of slits 33a are formed in the bent piece portion 33 formed by bending the outer peripheral portion of the door frame 20 inward. Regarding the specific dimensions of each part of the choke groove 32, the dimension A shown in FIG. 1 is set to 8 mm or more, and the dimension B shown in FIG.
Is 10 mm, the dimension C is 25 mm, the dimension D is 6 mm, and the dimension E is 8 mm. The slit choke groove 32 having such a structure has a smaller shape than a normal choke groove having no slit, but has a sufficiently excellent function of attenuating microwaves.

In the above structure, the microwave is applied to the cooking product by driving the magnetron to perform the range cooking. In this case, a part of the microwave is radiated to the door 14 side, and the microwave is emitted from the punching portion 27 and the contact piece portion 29 of the punching plate 25
The choke groove 32, the front plate portion 31 of the range main body 11, and the like are sequentially damped, so that there is no leakage to the outside.

Since the edge portion of the glass plate 26 of the inner barrier 21 is disposed between the frame-shaped plate portion 28 of the punching plate 27 and the front plate portion 31 of the heating and cooking chamber 12, the glass plate 26 is provided. Since the microwave is absorbed by the door 1,
It is possible to further prevent the microwave from leaking. Particularly, in this case, the convex portion 28a is provided on the frame-shaped plate portion 28 so that the glass plate 26 is floated slightly rearward from the rear surface of the frame-shaped plate portion 28, so that the microwave leakage can be more reliably performed. Can be prevented.

FIG. 6 shows a graph obtained by actually measuring the relationship between the microwave leak and the distance between the door 14 and the front plate portion 31 of the cooking chamber 12 (that is, the gap between the doors 14). This Figure 6
In, the curve P is the distance F between the frame-shaped plate portion 28 of the punching plate 27 and the front plate portion 31 of the cooking chamber 12.
(See FIG. 1) is 20 mm, and the curve Q shows the case where the distance F is 12 mm. As is apparent from this graph, if the distance E is 12 mm or less, microwave leakage can be reliably prevented. Therefore, in this embodiment, the distance E is set to 12 mm or less. The plate thickness of the glass plate 26 is about 3.5 mm.

According to this embodiment having such a structure, the side portions of the punching portion 27 of the inner barrier 21, in this case, the four side portions are widened to almost the edge portion of the front opening 13 of the cooking chamber 12. Therefore, the blind spot area becomes small, and the user can see the inside of the cooking chamber 12 sufficiently well through the transparent window portion 19 of the door 14. Moreover, in this case, the frame-shaped plate portion 28 of the punching plate 25 and the front plate portion 31 of the cooking chamber 12
Since the edge portion of the glass plate 26 is provided between and, since the microwave can be absorbed by the glass plate 26, the leakage of microwaves from the door 14 can be further prevented.

In the above embodiment, the four sides of the punching portion 27 are all extended to almost the edge of the front opening 13 of the cooking chamber 12, but instead of this, one of the punching portions 27 is used. Needless to say, the above-mentioned side portions may be extended to almost the edge of the front opening 13.

FIG. 7 shows a second embodiment of the present invention, and the difference from the first embodiment will be described. The second embodiment is an embodiment applied to a microwave oven with a heater, and as shown in FIG. 7, an upper heater 33 and a lower heater 34 are provided on a top plate 12a and a bottom plate 12b of a heating and cooking chamber 12, respectively. Is provided. In this case, the upper heater 33 is a glass tube heater, and the lower heater 34 is a flat heater. The flat lower heater 34 is arranged in the latter half of the cooking chamber 12, and the bottom plate portion 12 of the cooking chamber 12 is fixed by the heater mounting plate 36 via the heat insulating member 35.
It is fixed to the lower surface of b.

A rotary table 37 is rotatably provided on the inner bottom of the heating and cooking chamber 12. The rotary table 37 is configured to be rotationally driven by a motor 39 via a drive shaft 38. And cooking room 1
A shelf 40 is housed in the interior of 2 so that it can be taken in and out. In FIG. 7, only the lowermost shelf 40 is shown. Here, although not shown, the punching portion 2 of the inner barrier 21
The lower side of 7 is arranged near the lowermost shelf 40 accommodated in the cooking chamber 12, in this case, the upper end of the shelf 40.

The three sides except for the lower side of the punching portion 27 are configured to be extended to almost the edge of the front opening 13 of the cooking chamber 12. That is, the dimension G shown in FIG. 7 corresponds to the vertical dimension of the punching portion 27.
The configuration other than the above-described configuration is the same as the configuration of the first embodiment.

Therefore, according to the second embodiment, the first
It is possible to obtain substantially the same effect as that of the embodiment. In particular, according to the second embodiment, since the lower side of the punching portion 27 of the inner barrier 21 is configured to be aligned with the upper end of the lowermost shelf 40 housed in the cooking chamber 12,
It becomes difficult to visually recognize the inner bottom portion of the heating and cooking chamber 12, and almost no dust accumulated on the inner bottom portion and sparks generated during range cooking can be seen, and discomfort and anxiety of the user can be eliminated.

In the second embodiment, the lower side of the punching section 27 is aligned with the upper end of the lowermost shelf 40 housed in the cooking chamber 12, but the present invention is not limited to this. Instead, the lower side of the punching section 27 may be aligned with the lower end of the shelf board 40, or the lower side of the punching section 27 may be aligned with the vicinity of the shelf board 40.

[0030]

Since the present invention is as described above, the following effects can be obtained.

In the microwave oven of the first aspect, the side edge of the punching portion is expanded to almost the edge of the front opening of the heating and cooking chamber, so that the blind spot area is reduced and the user can open the heating and cooking chamber through the door. It is possible to see it sufficiently through.
Moreover, in this case, since the edge portion of the glass plate is arranged between the frame-shaped plate portion of the punching plate and the front opening edge portion of the heating and cooking chamber, microwaves are absorbed by the glass plate, so that the door is closed. It is possible to further prevent the microwave from leaking.

In the microwave oven according to the second aspect of the present invention, since the four sides of the punching portion are all extended to almost the edge of the front opening of the cooking chamber, the blind spot area is almost eliminated, and the visibility in the cooking chamber is reduced. Is greatly improved.

In the microwave oven of the third aspect, the three side portions of the punching portion excluding the lower side portion are formed so as to extend to substantially the edge of the front opening of the cooking chamber, and
Since the lower side of the punching part is configured to fit near the lowermost shelf board housed in the cooking chamber, the inner bottom part of the heating cooking chamber becomes difficult to see, so dust that accumulates on the inner bottom part The sparks that occur during cooking and microwave cooking are almost invisible, and the user's discomfort and anxiety can be eliminated.

[Brief description of drawings]

FIG. 1 is a sectional view around a door showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the entire microwave oven.

FIG. 3 is a diagram schematically showing a partial cross section of the upper and lower sides of the door.

FIG. 4 is a diagram schematically showing a partial cross section of the left and right sides of the door.

FIG. 5 is a partial perspective view of a choke groove.

FIG. 6 is a graph showing a relationship between a microwave leak and a door gap.

FIG. 7 is a vertical sectional side view of a microwave oven with a heater according to a second embodiment of the present invention.

8 is a diagram corresponding to FIG. 1 showing a conventional configuration.

[Explanation of reference numerals] 11 is a range main body, 12 is a cooking chamber, 13 is a front opening, 14 is a door, 19 is a see-through window, 20 is a door frame, 21 is an inner barrier (radio wave shield), and 22 is an outside. Barrier, 23 door sash, 24 flange part, 25 punching plate,
26 is a glass plate, 27 is a punching part, 28 is a frame-shaped plate part, 28a is a convex part, 29 is a contact piece part, 30 is a silicon adhesive, 31 is a front plate part (front opening edge part), and 32 is a choke groove. , 33 is an upper heater, 34 is a lower heater, 37 is a rotary table, 38 is a drive shaft, 39 is a motor, and 40 is a shelf plate.

Claims (3)

[Claims] 1. A door for opening and closing a front opening of a cooking chamber comprises a door frame, a punching plate, and a radio wave shield having a glass plate attached to the surface of the punching plate on the heating cooking chamber side. In the microwave oven configured as described above, the side portion of the punching portion formed on the punching plate is configured to extend to substantially the edge portion of the front opening of the cooking chamber, and the frame-shaped plate portion of the punching plate. A microwave oven, characterized in that an edge portion of the glass plate is disposed between a front opening edge portion of the heating and cooking chamber. 2. The microwave oven according to claim 1, wherein all of the four sides of the punching section are configured to extend to substantially the edge of the front opening of the cooking chamber. 3. The punching section is configured such that three side sections of the punching section, excluding the lower side section, are widened to substantially the edge of the front opening of the cooking chamber, and the lower side section of the punching section is heated by the heating section. The microwave oven according to claim 1, wherein the microwave oven is configured so as to fit in the vicinity of the lowermost shelf plate housed in the cooking chamber.