JPS62200677A - Electric wave leakage shielding apparatus - Google Patents
Electric wave leakage shielding apparatusInfo
- Publication number
- JPS62200677A JPS62200677A JP4220186A JP4220186A JPS62200677A JP S62200677 A JPS62200677 A JP S62200677A JP 4220186 A JP4220186 A JP 4220186A JP 4220186 A JP4220186 A JP 4220186A JP S62200677 A JPS62200677 A JP S62200677A
- Authority
- JP
- Japan
- Prior art keywords
- groove
- opening
- door
- heating chamber
- choke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 claims description 11
- 230000002265 prevention Effects 0.000 claims description 7
- 239000003989 dielectric material Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 14
- 238000007789 sealing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電子レンジ本体の加熱室とドアとの間隙から
の電波漏洩を防止する手段に関するもののドアのすき間
から電波が外部に漏洩するのを防止するため、加熱室周
縁に対向するドアの外周部にチョーク溝が設けられてい
る。特に近年加熱に使用される2 450 MHz
以外の高調波成分の漏洩をも防止することを目的として
、高調波用のチヨーク溝も併せて設ける構造のものもあ
る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to means for preventing leakage of radio waves from the gap between the heating chamber and the door of the main body of a microwave oven. Therefore, a choke groove is provided on the outer periphery of the door facing the periphery of the heating chamber. 2 450 MHz, which is especially used for heating in recent years
In order to prevent the leakage of harmonic components other than the above, there is also a structure in which a chiyoke groove for harmonics is also provided.
第4図はこの種のドアの一例であり、大、/h 2つの
チョーク溝13.14をそれぞれ設け、使用周波数24
50 MHz の波長をλとして、それぞれの溝13
.14の深さを1/4λ及び1/8λあるいは1/16
λの整数倍に設定して基本波でべ
4121号公報、実語昭48−5070号公報、公
実開昭52−7880号公報)
発明が解決しようとする問題点
しかしながら、上記従来のような構成の場合、各チョー
クの溝を独立して設けているため構成が複雑で、大型化
し、コスト上、デザインとも実用性にとぼしく、特に溝
カバーについてはそれぞれの溝に独立して設けるためを
こ、単に固定方法一つ取ってみてもやっかいなものであ
った。Figure 4 shows an example of this type of door, which has two choke grooves 13 and 14, respectively, and has a working frequency of 24.
Each groove 13 has a wavelength of 50 MHz as λ.
.. 14 depth to 1/4λ and 1/8λ or 1/16
Problems to be Solved by the Invention However, the problems to be solved by the invention are as follows: In the case of the structure, since the grooves of each choke are provided independently, the structure is complicated and large, and is impractical in terms of cost and design. However, even if one fixing method was used, it was troublesome.
問題点を解決するための手段
そこで本発明では、高調波用のチョーク溝(第2の溝)
を基本波(2450MHz )用チョークを構成する溝
(第1の溝)の内側に設ける構成とし、しかもこれら2
つの溝、すなわち基本波用のチョーク溝(第1の溝)と
高調波用チョーク溝(第2のl1g)を同時に覆う誘電
体よりなる共通の溝カバーを一つ設けることにより、非
常にコンパクトで、かつ単純な構成デザインで優れたシ
ール特性のドアを安価に実現したものである。Means for Solving the Problem Therefore, in the present invention, a choke groove (second groove) for harmonics is provided.
is provided inside the groove (first groove) constituting the fundamental wave (2450MHz) choke, and these two
By providing one common groove cover made of dielectric material that simultaneously covers the two grooves, that is, the choke groove for the fundamental wave (first groove) and the choke groove for harmonics (second l1g), it is extremely compact. In addition, a door with a simple structural design and excellent sealing properties was realized at a low cost.
作 用
高調波用のチョーク溝である第2の溝を基本波用のチ目
−り溝である第1の溝の開口部に設け、さらに第1の溝
と第2の溝を同時に覆う誘電体材料よりなる共通の溝カ
バーを設けることにより、基本波用のチョーク溝のみの
構成の場合と外形がほとんど変わらずに、高調波領域を
も含むすぐれたシールド特性が得られる。A second groove, which is a choke groove for action harmonics, is provided at the opening of the first groove, which is a chime groove for fundamental waves, and a dielectric groove is provided that simultaneously covers the first groove and the second groove. By providing a common groove cover made of body material, excellent shielding characteristics including the harmonic region can be obtained, with the outer shape being almost the same as in the case of a configuration with only a choke groove for the fundamental wave.
実施例
以下、本発明の実施例を添付の図面に基づいて説明する
。Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.
第1図(,1は本発明の一実施例を示しており、ドア2
は加熱室1の開口周縁部8に当接するシール板4と、こ
のシール板4の外周部にスポット溶接等で固定され、前
記開口周縁部8に開口側が対向するコの字状断面を有す
る外枠体3と、この外枠体3で構成された溝Cを第1の
溝C1と第3の溝C3に分割する一定周期で断続した金
属性の壁面体6とからなる。そして、前記シール板4の
外周端は、その周縁部を前記開口部周縁部18に開口側
が対向し、深さd、巾W共に第1の溝c1の深さD、巾
Wの半分以下のコの字状の断面に成形され、第2の溝o
2を構成している。さらに、溝cl。FIG. 1 (, 1 shows an embodiment of the present invention;
is a sealing plate 4 that comes into contact with the opening periphery 8 of the heating chamber 1, and is fixed to the outer periphery of this sealing plate 4 by spot welding or the like, and has a U-shaped cross section with the opening side facing the opening periphery 8. It consists of a frame body 3 and a metal wall body 6 which is interrupted at a constant period to divide the groove C formed by the outer frame body 3 into a first groove C1 and a third groove C3. The outer peripheral end of the seal plate 4 has its peripheral edge facing the opening peripheral edge 18, and has a depth d and a width W that are less than half of the depth D and width W of the first groove c1. It is formed into a U-shaped cross section and has a second groove o.
2. Furthermore, groove cl.
c2.c3の開口部は樹脂からなる共通の溝カバー9に
より覆われると共に、溝カバー9には第2の溝にはまり
込むツバ状の突起部9aがある。c2. The opening of c3 is covered by a common groove cover 9 made of resin, and the groove cover 9 has a collar-shaped protrusion 9a that fits into the second groove.
上記構成において、第2の#C2は主に高調波を中心と
した高い周波数の電波漏洩に対してチョークとして作用
し、第1、第3の溝at、c3は、基本波を中心とした
低い周波数に対してチョーク作用を有する。ここで第2
の溝c2は、第1の溝c1の開口部に位置する構成とな
るため、第1の溝c1のチョーク作用を決定づける溝の
実効深さLは、第2の溝C2の配設にかかわらずほとん
ど変化せず、又溝カバー9も高調波用のチョークである
第2の溝C2のないときとほとんどその構造、構成は変
えずに第1、第2、第3の溝の共通の溝カバーとするこ
とができる。従って基本波(2450MHz) への
チョーク作用のみを狙ったチョークとほとんど同等の構
成、大きさで高調波用の第2溝c2を備えたドアが実現
される。In the above configuration, the second #C2 mainly acts as a choke against high-frequency radio wave leakage centered on harmonics, and the first and third grooves at and c3 act as a choke on high-frequency radio wave leakage centered on the fundamental wave. Has a choke effect on frequency. Here the second
Since the groove c2 is located at the opening of the first groove c1, the effective depth L of the groove that determines the choke action of the first groove c1 is independent of the arrangement of the second groove C2. There is almost no change, and the groove cover 9 is also a common groove cover for the first, second, and third grooves, with almost the same structure and configuration as when there is no second groove C2, which is a choke for harmonics. It can be done. Therefore, a door with a second groove c2 for harmonics can be realized, which has almost the same configuration and size as a choke that aims only to choke the fundamental wave (2450 MHz).
しかも、上記実施例第1図(、)及び要部拡大図第1図
(b)に示すように、溝カバー9に第2の溝C2にはま
り込むツバ状の突起部9aを設けることは、溝カバー9
の機械的強度を維持する補強リブとして働き、溝カバー
9の浮き、はずれの防止になり、又多少浮いても、その
スキ間が目高ちにくいという効果がある。さらに重要な
事は、一般に知られるようにこうしたチョーク機能を決
定づける電波の電気長(波長)は、伝播する媒体の誘電
率ενに依存し、ツバ状の突起部9aにより、高調波用
チョーク溝である第2の溝c2がチョーク効果を発揮す
る周波数が変化することである。すなわち、溝カバーG
を構成する誘電体材料が、比誘電率εν=2.2の樹脂
で、ツバ状の突起部9aが、第2の溝c2に完全にはま
り込む構成であればチョーク効果を発揮する電波の周波
数は1/c7勾1/1.5すなわち約3分の2を目処に
変化することになる。従って、ツバ状の突起部9aの厚
さt1高さhを第2の溝C2の巾w1深さdに対応して
変化することにより、第2の溝C2のチョーク効果を発
揮する周波数を、1/Jv−を最大値として変化させる
ことができる一方で、この効果はあくまでも第1、第3
の溝c1.c3へは影響をほとんど与えないので、基本
波(2450MHz) に対するチョーク効果と独立
して、高調波用チml−りの効果を調整できることにな
る。Moreover, as shown in FIG. 1(a) and the enlarged view of the main part in FIG. 1(b) of the above embodiment, providing the groove cover 9 with a collar-shaped protrusion 9a that fits into the second groove C2, Groove cover 9
It acts as a reinforcing rib that maintains the mechanical strength of the groove cover 9, and prevents the groove cover 9 from floating or coming off.Also, even if it floats to some extent, the gap is less likely to become noticeable. More importantly, as is generally known, the electrical length (wavelength) of the radio wave that determines this choke function depends on the dielectric constant εν of the propagating medium, and the brim-like protrusion 9a allows the harmonic choke groove to be This is because the frequency at which a certain second groove c2 exhibits a choke effect changes. That is, the groove cover G
If the dielectric material constituting is a resin with a relative dielectric constant εν = 2.2, and the brim-shaped protrusion 9a completely fits into the second groove c2, the frequency of the radio wave that exhibits the choke effect is will change at a slope of 1/c7, 1/1.5, or about two-thirds. Therefore, by changing the thickness t1 height h of the brim-shaped protrusion 9a in accordance with the width w1 depth d of the second groove C2, the frequency at which the second groove C2 exerts its choke effect can be adjusted to While it is possible to change 1/Jv- as the maximum value, this effect is limited to the first and third
Groove c1. Since it has almost no effect on c3, the harmonic chiming effect can be adjusted independently of the choke effect on the fundamental wave (2450 MHz).
第2図は、壁面体6の斜視図であり、ピッチ大P2のス
リット大6aにより断続構造を実現している。このピッ
チ大P2を最適化することにより、各チョークの効果を
飛躍的に向とできる。又頂部の折り返し部6Cや、矩形
状の穴6b等を設けることにより、特開昭59−146
188号公報に見られるようなチョーク溝の小型化の作
用も同時に実現される。FIG. 2 is a perspective view of the wall body 6, in which an intermittent structure is realized by large slits 6a with a large pitch P2. By optimizing this pitch size P2, the effectiveness of each choke can be dramatically improved. In addition, by providing a folded portion 6C at the top, a rectangular hole 6b, etc., JP-A-59-146
At the same time, the effect of reducing the size of the choke groove as seen in the No. 188 publication is also realized.
第3図は、シール板4の要部斜視図で高調波用の第2の
溝C2の構成部分を示している。第3図の場合、スリッ
ト15は溝C2を構成する片側の壁面に設けられている
が、このスリット15は特に設けなくともよいし、又反
対側の壁面やあるいは両壁面に設けても良く、高調波へ
のチョーク特性の最適化のために適宜選択される。FIG. 3 is a perspective view of the main part of the seal plate 4, showing the constituent parts of the second groove C2 for harmonics. In the case of FIG. 3, the slit 15 is provided on one wall surface of the groove C2, but this slit 15 may not be provided, or may be provided on the opposite wall surface or both wall surfaces. It is selected appropriately to optimize the choke characteristics to harmonics.
なお各面の大きさく寸法)は目的とする周波数により最
適な値に設定されるが、一般にかなり広帯域なチョーク
特性を有しており、特に高調波用溝の場合その傾向が顕
著であり、従来例に掲げた実開昭48−4121号公報
シこ見られるように基本波2450 MHz の1/8
^あるいは1/16λの整数倍といった方法で決めるこ
とはあまり意味はない。The size and dimensions of each surface are set to optimal values depending on the target frequency, but generally they have a fairly wide-band choke characteristic, and this tendency is especially noticeable in the case of harmonic grooves, As can be seen in Utility Model Application Publication No. 48-4121 listed as an example, the fundamental wave is 1/8 of 2450 MHz.
It is not very meaningful to determine it using methods such as ^ or an integral multiple of 1/16λ.
ただおおむね、溝の深さ方向で1/4^となる付近で大
きなシールド効果の得られることは基本波、高調波共に
同じである。However, the fact that a large shielding effect can be obtained in the vicinity of 1/4^ in the depth direction of the groove is the same for both fundamental waves and harmonics.
第1図の実施例の場合について示せば、第1の溝c1の
巾Wは27mm1深さDは21 mm 、第2の溝02
の巾Wは2.5mm、深さdは8 m m 。In the case of the embodiment shown in FIG. 1, the width W of the first groove c1 is 27 mm, the depth D is 21 mm, and the second groove c1 has a width W of 27 mm and a depth D of 21 mm.
The width W is 2.5 mm and the depth d is 8 mm.
ツバ状の突起部9aの厚さ先は1 、5 m m 、
高さhは5mm前後の値で、基本波(2450MHz
)と第4、第5高調波付近で高いシールド効果を得る
ことができる。The thickness of the brim-shaped protrusion 9a is 1.5 mm,
The height h is around 5mm, and the fundamental wave (2450MHz
), and a high shielding effect can be obtained near the fourth and fifth harmonics.
なお、溝カバーを共通の溝カバー9とすることにより溝
カバー9に設けたツバ状の突起部9&に対し溝カバー9
自身の補強と、浮きあるいははずれ防止としての機能と
、高調波チッークの周波数調整の機能の両方を持たせる
ことができるが、電子レンジの加熱室内に放射される高
調波のうち、問題となるのは一般に第2から第7高調波
までと広範囲にわたり、どの高調波に対して最も高いシ
ールド効果を必要とするかは、電子レンジを使用する国
の法規や、発振管であるマグネトロンの特性によっても
異なる。Note that by using the common groove cover 9 as the groove cover, the groove cover 9
It can have the functions of reinforcing itself, preventing it from floating or coming off, and adjusting the frequency of the harmonic tick. In general, the range is wide ranging from the 2nd to the 7th harmonic, and which harmonic requires the highest shielding effect depends on the laws and regulations of the country where the microwave oven is used and the characteristics of the magnetron, which is the oscillation tube. different.
その点本実施例の構成によれば、溝カバー9のツバ状の
突起部9aの形状を変えることにより(無くすことも含
む)最適な周波数への調整を溝カバー9のみの変更でし
かも基本波の特性と無関係に可能となり、部品の共用化
のみならず、設計の簡便化という点でも非常に有効であ
る。In this respect, according to the configuration of this embodiment, by changing the shape of the brim-shaped protrusion 9a of the groove cover 9 (including eliminating it), adjustment to the optimum frequency can be achieved by changing only the groove cover 9, and moreover, the fundamental frequency can be adjusted. This is possible regardless of the characteristics of the device, and is very effective not only in sharing parts but also in simplifying design.
発明の効果
以上のように本発明の電子レンジ用の電波漏洩防止装置
によれば、次の効果が得られる。Effects of the Invention As described above, the radio wave leakage prevention device for a microwave oven of the present invention provides the following effects.
すなわち、高調波用のチョーク溝である第2の溝を、基
本波用チョーク溝である第1の溝の開口部に突き出して
設け、これらの溝を共通の溝カバーで覆うことにより、
基本波用チョーク溝のみの構成の場合と外形はほとんど
変化せず、非常にコンパクトかつ簡素な構成で、コスト
も安く実現される。That is, by providing the second groove, which is a choke groove for harmonics, protruding from the opening of the first groove, which is a choke groove for fundamental waves, and covering these grooves with a common groove cover,
The external shape is almost unchanged from the configuration with only the fundamental wave choke groove, and the configuration is extremely compact and simple, and can be realized at low cost.
第1図(、)は本発明の一実施例(こおける電波漏洩防
止装置の要部断面図、第1図(b)は同拡大断面図、第
2図は同壁面体の斜視図、第3図は同シール板の要部斜
視図、第4図は従来の電子レンジの電波漏洩防止装置の
要部断面図である。
1・・・・・・加熱室、3・・・・外枠体、4・・・・
・・シール板、6・・・・・壁面体、8・・・・・開口
カバー。
代理人の氏名 弁理士 中 尾 敏 男 はか1名第1
図
/−一一相釣虹
2−一−ドア
δ−−−関口川搏+用P
(b)
第2図
第3図Fig. 1(,) is a cross-sectional view of a main part of an embodiment of the present invention (radio wave leakage prevention device), Fig. 1(b) is an enlarged sectional view of the same, Fig. 2 is a perspective view of the same wall body, Figure 3 is a perspective view of the main parts of the same seal plate, and Figure 4 is a cross-sectional view of the main parts of a conventional radio wave leakage prevention device for a microwave oven. 1... Heating chamber, 3... Outer frame. Body, 4...
... Seal plate, 6 ... Wall body, 8 ... Opening cover. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure/-11 phase fishing rainbow 2-1-door δ --- Sekiguchi River Rin + P (b) Figure 2 Figure 3
Claims (4)
の加熱室の前記開口部を開閉するドアとを有し、このド
アには、前記加熱室の開口部の周縁部に対向する第1の
溝と、この第1の溝の開口部に突き出して設けた深さ、
幅ともにそれぞれ前記第1の溝の半分以下の第2の溝と
、第1及び第2の溝を同時に覆う誘電体材料よりなる溝
カバーとを設けた電波漏洩防止装置。(1) A heating chamber that has an opening and is irradiated with high-frequency waves, and a door that opens and closes the opening of the heating chamber, and the door has a door facing the periphery of the opening of the heating chamber. a first groove that protrudes from the opening of the first groove;
A radio wave leakage prevention device comprising second grooves each having a width less than half of the first groove, and a groove cover made of a dielectric material that simultaneously covers the first and second grooves.
を有する特許請求の範囲第1項記載の電波漏洩防止装置
。(2) The radio wave leakage prevention device according to claim 1, wherein the groove cover has a collar-shaped protrusion that fits into the second groove.
の加熱室の前記開口部を開閉するドアとを有し、このド
アには前記加熱室の開口部の周縁部に対向する溝と、こ
の溝を第1の溝と第3の溝の2条の溝に分割する一定周
期で断続した金属製の壁面体と、この第1の溝の開口部
に突き出して設けた深さ、巾ともにそれぞれ前記第1の
溝の半分以下の第2の溝と、前記第1、第2、第3の溝
を同時に覆う誘電体材料よりなる溝カバーとを設けた電
子レンジ用の電波漏洩防止装置。(3) A heating chamber having an opening and irradiated with high frequency waves, and a door for opening and closing the opening of the heating chamber, the door having a door facing the peripheral edge of the opening of the heating chamber. A groove, a metal wall body which is interrupted at a certain period to divide this groove into two grooves, a first groove and a third groove, and a depth provided by protruding into the opening of this first groove. , a radio wave leakage for a microwave oven, which is provided with a second groove whose width is less than half of the first groove, and a groove cover made of a dielectric material that simultaneously covers the first, second, and third grooves. Prevention device.
を有する特許請求の範囲第3項記載の電波漏洩防止装置
。(4) The radio wave leakage prevention device according to claim 3, wherein the groove cover has a collar-shaped protrusion that fits into the second groove.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4220186A JPS62200677A (en) | 1986-02-27 | 1986-02-27 | Electric wave leakage shielding apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4220186A JPS62200677A (en) | 1986-02-27 | 1986-02-27 | Electric wave leakage shielding apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62200677A true JPS62200677A (en) | 1987-09-04 |
Family
ID=12629396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4220186A Pending JPS62200677A (en) | 1986-02-27 | 1986-02-27 | Electric wave leakage shielding apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62200677A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5133339A (en) * | 1975-07-18 | 1976-03-22 | Matsushita Electric Ind Co Ltd | KOSHUHAKANETSUKI |
JPS5387044A (en) * | 1977-01-12 | 1978-08-01 | Hitachi Heating Appliance Co Ltd | High frequency heating apparatus |
JPS6047714A (en) * | 1983-08-24 | 1985-03-15 | Toyota Motor Corp | Pressure control unit in suspension bush of shock absorber |
-
1986
- 1986-02-27 JP JP4220186A patent/JPS62200677A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5133339A (en) * | 1975-07-18 | 1976-03-22 | Matsushita Electric Ind Co Ltd | KOSHUHAKANETSUKI |
JPS5387044A (en) * | 1977-01-12 | 1978-08-01 | Hitachi Heating Appliance Co Ltd | High frequency heating apparatus |
JPS6047714A (en) * | 1983-08-24 | 1985-03-15 | Toyota Motor Corp | Pressure control unit in suspension bush of shock absorber |
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