JPH0794272A - Door for high frequency wave heating device - Google Patents

Abstract

PURPOSE:To effectively prevent leakage a high frequency waves from the vicinity of a corner part of a door by improving the effect of attenuating the high frequency waves in the vicinity of the corner part of the door. CONSTITUTION:In this electronic range door 1, a stepped part of almost L- shaped section is formed along each side in a peripheral edge part 10 of the door 1. A comb-shaped periodic structure 20 is fixed to this stepped part, and of these stepped part and periodic structure 20, a choke groove 30 is formed in a condition turned around the peripheral edge part 10. The periodic structure 20 is constituted by integrally connecting a plurality of conductor pieces 21 of reverse L-shaped section in a comb shape with a prescribed space provided. A protrusive surface part 22 for changing a high frequency attenuating characteristic of the choke groove 30 is provided in the conductor piece 21 positioned in an end part of the periodic structure 20. A protruding amount of the protrusive surface part 22 is set larger than a protruding amount of a protrusive surface part 21d in the other part by a prescribed amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door used in a high frequency heating device, and more particularly to a door structure for preventing high frequency leakage from a heating chamber of the high frequency heating device.

[0002]

2. Description of the Related Art In a high frequency heating apparatus such as a microwave oven, an object to be heated is housed in a heating chamber, and high frequency is introduced into the heating chamber to perform high frequency heating. When this heating and cooking is performed, a door that opens and closes the opening of the heating chamber is necessary in order to put the object to be heated in and out of the heating chamber. On the other hand, since the high frequency is harmful to the human body, it is necessary to prevent the high frequency from leaking between the door and the heating chamber.

On the basis of the above high frequency leakage prevention request, the door is provided with the following high frequency leakage prevention structure (see Japanese Examined Patent Publication No. 63-16865 and Japanese Examined Patent Publication No. 4-75638). ). FIG. 2 is a plan view of the microwave oven door as viewed from the inside. 3 is a cross-sectional view taken along the line AA in FIG.

Explaining with reference to these figures, a peripheral portion 10 of the door 1 is formed with a step portion having a substantially L-shaped cross section, and a comb-shaped bottom portion 13 forming a part of the step portion. The periodic structure 20 is fixed. Further, reference numeral 11
Is a sealing surface portion that comes into planar contact with the periphery of the opening of the heating chamber when the door 1 is closed. A choke groove 30 is formed by the bottom surface portion 13, the side wall surface portion 12 forming the side wall surface of the step portion, and the periodic structure 20. The choke groove 30 causes a high frequency wave from the heating chamber to the outside. Prevents leakage.

FIG. 6 is an enlarged perspective view of the periodic structure 20 used conventionally. Referring also to FIGS. 2 and 6, at the same time, the periodic structure 20 is formed integrally with a large number of conductor pieces 21 each having an inverted L-shaped cross section and arranged along each side of the peripheral portion 10. ing.

[0006]

By the way, as shown in FIG. 2, the corner portion of the peripheral edge portion 10 is the side wall surface portion 1.
Since it is manufactured by narrowing down 2, it has a quarter circular shape. Therefore, the choke groove 30 near the corner
Is wider than the width of the choke groove 30 in other parts.

Therefore, the high frequency wave traveling in the direction of arrow C in the figure is
The choke groove 30 effectively damps and prevents leakage, but at the corner portion, for example,
There is a problem that the high frequency wave traveling in the direction of arrow B is not sufficiently attenuated and the high frequency wave leaks. Therefore, an object of the present invention is to provide a high-frequency heating device door capable of effectively attenuating high-frequency waves passing near the corner portion of the door to prevent leakage.

[0008]

A door for a high-frequency heating apparatus according to the present invention opens and closes an opening of a heating chamber, and at the time of closing, a sealing surface portion which is in surface contact with the periphery of the opening of the heating chamber, and the sealing surface portion. A side wall surface portion extending in a direction away from the opening at a substantially right angle, and a bottom surface portion extending outwardly of the door at a substantially right angle to the side wall surface portion are integrally formed on the peripheral portion of the door, A door for a high-frequency heating device, wherein a choke groove for preventing high-frequency leakage is formed around the peripheral portion of the door by mounting the periodic structure on the bottom surface, the periodic structure comprising: A mounting surface portion that is mounted on the bottom surface portion, a standing surface portion that extends on the mounting surface portion and rises substantially parallel to the side wall surface portion, and that extends on the rising surface portion,
An inverted cross-section consisting of an overhanging surface portion that is substantially parallel to the mounting surface portion and projects toward the side wall surface portion, and a projecting surface portion that extends on this overhanging surface portion and that is substantially parallel to the upright surface portion and projects toward the bottom surface portion In a door for a high-frequency heating device in which a plurality of L-shaped conductor pieces are arranged in a comb shape at a predetermined interval, the protruding amount of a protruding surface portion located near the corner portion of the door is different from that of the other portion. It is characterized in that it is larger by a predetermined amount than the protrusion amount of the protrusion surface portion located at.

[0009]

According to the door for a high-frequency heating apparatus of the present invention, the choke groove is formed by the side wall surface portion and the bottom surface portion integrally formed on the peripheral portion of the door and the comb-like periodic structure. It is formed in a state of orbiting the part. The choke groove attenuates the high frequency wave that has traveled from the inside of the heating chamber to each side of the peripheral edge of the door.

In addition, the cross section of the periodic structure is inverted L
By changing the amount of protrusion of the protruding surface portion of the character-shaped conductor piece, it is possible to easily change the high-frequency attenuation characteristic of the choke groove. Therefore, in the vicinity of the corner portion of the door, by making the protruding amount of the protruding surface portion of the conductor piece larger than the protruding amount of the protruding surface portion of the conductor piece located in another portion by a predetermined amount, the choke in the vicinity of the corner portion is increased. It is possible to obtain a desired damping characteristic due to the groove.

[0011]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. The same parts and parts as those of the conventional door described above are designated by the same reference numerals. Figure 2
It is a principal part enlarged plan view in the state which looked at the door 1 for microwave ovens as the high frequency heating apparatus which concerns on one Example of this invention from the heating chamber side. 3 is a cross-sectional view taken along the line AA in FIG.

Explaining with reference to FIGS. 2 and 3, the door 1 has a rectangular shape. A step portion having a substantially L-shaped cross section is formed on the peripheral edge portion 10 of the door 1 along each side of the peripheral edge portion 10, and the comb-shaped periodic structure 20 is fixed to the step portion. The stepped portion and the periodic structure 20 form a choke groove 30 in a state of orbiting the peripheral edge portion 10 so as to attenuate a high frequency wave passing through the peripheral edge portion 10.

Reference numeral 60 indicates a punching hole provided in the door 1 and reference numeral 50.
Indicates an interior plate made of glass. A sealing surface portion 11 that opens and closes the opening of the heating chamber and is in surface contact with the periphery of the opening of the heating chamber when the door 1 is closed.
A side wall surface portion 12 extending substantially at a right angle to the sealing surface portion 11 in a direction away from the opening; a bottom surface portion 13 extending substantially outwardly of the side wall surface portion of the door 1; A flange portion 14 that rises from the outermost edge portion 13 of the side wall surface portion 12 in a substantially parallel manner is integrally formed,
As a result, the substantially L-shaped step portion is formed.

In the vicinity of the corner of the door 1, since the side wall surface portion 12 is manufactured by being narrowed down, the corner portion has a quarter circular curve. FIG. 1 is an enlarged perspective view showing a main part of the periodic structure 20. Referring also to FIG. 1 at the same time, the periodic structure 20 is formed integrally with a plurality of conductor pieces 21 having an inverted L-shaped cross section, which are arranged in a comb shape at predetermined intervals.

The conductor piece 21 is attached to the bottom surface portion 13, is attached to the attachment surface portion 21a for fixing the periodic structure 20, and is extended to the attachment surface portion 21a and rises substantially parallel to the side wall surface portion 12. The rising surface portion 21b,
An overhanging surface portion 21c extending on the upright surface portion 21b and extending substantially parallel to the mounting surface portion 21a toward the side wall surface portion 12 side.
And the raised surface portion 2c extending to the projecting surface portion 21c.
A protruding surface portion 2 that is substantially parallel to 1b and protrudes toward the bottom surface portion 13 side.
1d and. In addition, the mounting surface portion 21a
Are fixed to the bottom surface portion 13 by spot welding at a plurality of points (P, P,).

The feature of this embodiment is that the protruding amount of the protruding surface portion 22 located near the corner portion of the door 1 is such that the protruding surface portion 2 is located at a portion other than the vicinity of the corner portion.
The point is that the protrusion amount is larger than the protrusion amount of 1d by a predetermined amount.
With reference to FIG. 1, the protruding surface portion at the end of the periodic structure 20, that is, the protruding surface portion 22 located near the corner portion of the door 1 is formed in a pentagonal shape, and the apex of the pentagonal shape. 22a largely projects to the bottom surface 13 side. As a result, the protrusion amount of the protrusion surface portion 22 is set to be larger than the protrusion amount of the protrusion surface portion 21d in the portion other than the vicinity of the corner portion by a predetermined amount.

According to the present embodiment having the above-described structure, the high frequency wave traveling in the direction of arrow C in FIG. 2 is attenuated by the choke groove 30, whereby the high frequency wave can be prevented from leaking to the outside. A plurality of slits are formed along the longitudinal direction of the periodic structure 20 at predetermined intervals between the adjacent conductor pieces 21. This allows
It is possible to attenuate the high frequency wave traveling in the direction perpendicular to the direction of the arrow C and prevent leakage to the outside.

On the other hand, the following effects can be obtained even for a high frequency wave passing near the corner portion of the door 1, for example, a high frequency wave traveling in the direction of arrow B. That is, in the vicinity of the corner portion, since the side wall surface portion 12 of the door 1 is formed in a quarter circular shape, the width H of the choke groove 30 is
It is wider than other parts. This effect
In the vicinity of the corner portion, the high frequency attenuation characteristic of the choke groove 30 changes, and the attenuation effect is deteriorated. Therefore, if the protrusion amount of the protrusion surface portion 22 is equal to that of the protrusion surface portion 2
If the protrusion amount is the same as that of 1d, the high frequency wave passing near the corner cannot be attenuated effectively, and the high frequency wave leaks to the outside.

On the other hand, in this embodiment, the amount of protrusion of the protruding surface portion 22 is larger than the amount of protrusion of the protruding surface portion 21d located in a portion other than the vicinity of the corner portion, and therefore, the vicinity of the corner portion. In the above, it is possible to further change the damping characteristic and improve the deteriorated damping effect. Therefore, even if the width H of the choke groove 30 becomes wide in the vicinity of the corner portion, it is possible to obtain the attenuation characteristic that the high frequency can be effectively attenuated, the high frequency is effectively attenuated, and the high frequency leaks to the outside. Can be prevented.

The present invention is not limited to the above embodiment, and the shape of the protruding surface portion 22 is as shown in FIG.
The shapes shown in to (d) may be used. That is, FIG.
In (a), the protruding surface portion 22 is linearly and obliquely cut from the one end side 22b to the other end side 22c. Figure 4 (b)
Is a substantially central portion 22 of the protruding surface portion 22 from the one end side 22b.
The protrusion amount up to d is the same as that of the protrusion surface portion 21d,
The portion from the substantially central portion 22d to the other end portion 22c is formed in a mountain shape. Further, in FIG. 4C, a curved line is cut from the one end side 22b to the other end side 22c. Further, FIG. 4D shows the protruding surface portion 2 from the one end side 22b.
2 is formed with the same amount of protrusion as the protrusion surface portion 21d up to the substantially central portion 22d.
The part up to 2c is cut diagonally in a straight line. In short, the shape of the protruding surface portion 22 is the same as that of the choke groove 30.
The shape can be changed to various shapes that can effectively obtain the attenuation characteristic of attenuating the high frequency according to the width H.

Further, as shown in FIG. 5, the peripheral edge portion 1 of the door 1 is
The periodic structure 20 may be integrally formed with the door 1 by continuously forming the bottom surface portion 13 formed in 0 and the attachment surface portion 21a of the periodic structure 20. In addition to being used for a microwave oven door, the present invention can be generally used for a high-frequency heating device door that needs to prevent high-frequency leakage.

In addition, various design changes can be made without changing the gist of the present invention.

[0023]

According to the present invention, the choke groove is formed by the side wall surface portion formed on the peripheral portion of the door and the periodic structure disposed on the peripheral portion so as to surround the peripheral portion. Thus, it is possible to effectively attenuate the high frequency wave that has traveled from the inside of the heating chamber to each side portion of the peripheral edge portion and the high frequency wave that has traveled along each of the side edges to prevent leakage of the high frequency wave.

In the vicinity of the corner of the door, the width of the choke groove is wide, and the high frequency tends to leak. However, the protruding amount of the protruding surface portion of the conductor piece constituting the periodic structure is Since the protruding amount of the protruding surface portion of the conductor piece located in the other portion is made larger by a predetermined amount, even if the width of the choke groove becomes wider in the vicinity of the corner portion, the high frequency attenuation effect is correspondingly improved. Can be made. Therefore, even in the vicinity of the corner portion of the door, the high frequency can be sufficiently attenuated to prevent the high frequency from leaking.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view showing a main part of a periodic structure according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view of an essential part showing a peripheral portion of the door according to the embodiment of the present invention.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a diagram showing a modified example of the shape of the protruding surface portion of the conductor piece.

FIG. 5 is a cross-sectional view showing a modified example of the structure of the peripheral portion of the door.

FIG. 6 is an enlarged perspective view showing a main part of a conventional periodic structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door 10 Peripheral part 11 Sealing surface part 12 Side wall surface part 13 Bottom surface part 20 Periodic structure 21 Conductor piece 21a Attachment surface part 21b Elevating surface part 21c Overhanging surface part 21d Projecting surface part 22 Projecting surface part 30 Choke groove

Claims (1)

[Claims] 1. A sealing surface portion which opens and closes the opening of the heating chamber and is in surface contact with the periphery of the opening of the heating chamber when closed, and a side wall surface portion which extends substantially perpendicular to the sealing surface portion in a direction away from the opening. And a bottom portion extending outwardly of the door at a substantially right angle to the side wall surface portion are integrally formed on the peripheral portion of the door, and by attaching the periodic structure to the bottom portion, high frequency A high-frequency heating device door, in which a choke groove for preventing leakage is formed around a peripheral portion of the door, wherein the periodic structure has a mounting surface portion to be mounted on the bottom surface portion and an extension surface on the mounting surface portion. The rising surface portion that rises substantially parallel to the side wall surface portion, the extension surface portion that extends on the rising surface portion and that extends substantially parallel to the mounting surface portion and that extends toward the side wall surface portion, and the extension surface portion that extends to the side wall surface portion. And is protruded toward the bottom surface side substantially parallel to the rising surface part. In a door for a high-frequency heating device, which comprises a plurality of conductor pieces each having an inverted L-shaped cross section and formed of a protruding surface portion and arranged in a comb shape at a predetermined interval, a protrusion positioned near a corner portion of the door. The amount of protrusion of the surface is
A door for a high-frequency heating device, which is larger than a protrusion amount of a protrusion surface portion located in another portion by a predetermined amount.