JPH06260279A - Radio wave seal device - Google Patents

Radio wave seal device

Info

Publication number
JPH06260279A
JPH06260279A JP4422693A JP4422693A JPH06260279A JP H06260279 A JPH06260279 A JP H06260279A JP 4422693 A JP4422693 A JP 4422693A JP 4422693 A JP4422693 A JP 4422693A JP H06260279 A JPH06260279 A JP H06260279A
Authority
JP
Japan
Prior art keywords
groove
opening
width
radio wave
heating chamber
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
Application number
JP4422693A
Other languages
Japanese (ja)
Inventor
Takahito Ishii
隆仁 石井
Mamoru Isoya
守 礒谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4422693A priority Critical patent/JPH06260279A/en
Publication of JPH06260279A publication Critical patent/JPH06260279A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/763—Microwave radiation seals for doors

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)

Abstract

PURPOSE:To significantly reduce the size of a radio wave seal device of a door for high frequency heater. CONSTITUTION:A radio wave seal device is formed of a recessed groove 3 having a groove opening part consisting of a bottom surface 4 and both side wall surfaces 5, 6 formed of a conductive wall surface group on a door peripheral part 2, and a short-circuit part; a protruding part 7 consisting of a conductive material protruding from at least either one groove side surface upper part toward the groove center so that the groove width B1 of the opening part of the recessed groove 3 is narrower than the groove width B2 of the short-circuit part; and a groove cover body 8 for covering the opening part of the recessed groove 3 including the protruding part 7. A plurality of slits 6S are provided on the protruding part 7 and at least one of the wall surface group in the longitudinal direction of the groove so that the conductor width A1 of the groove is smaller than a pitch P, and the conductor width A1 of the groove opening part is set larger than the conductor width 2A of the short-circuit part. In the corner part of a heating chamber, the inside wall surface 5 of the recessed groove 3 has a curve of a radius R, and the protruding part end surface also has a curve of a radius R1 to keep the equal distance at least with the inside wall surface 5. A radio wave absorbing body 8 is installed to the corner part according to this constitution.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、高周波加熱器、特に、
電子レンジ等の開閉自在なドアを有する機器用の電波シ
ール装置に関する。FIELD OF THE INVENTION The present invention relates to a high frequency heater, in particular,
The present invention relates to a radio wave sealing device for equipment having a door such as a microwave oven that can be opened and closed.

【０００２】[0002]

【従来の技術】従来の電波シール装置としては、λ／４
インピーダンス反転を利用したチョーク方式がある。図
６において、２０はステンレス・鉄などの金属からなる
電子レンジの加熱室本体の周縁部、２１はステンレス・
鉄などの金属からなる開閉自在のドアの周縁部である。
加熱室本体周縁部２０とドア周縁部２１との隙間が漏波
路２２、ドア周縁部２１の漏波路２２の外側には、加熱
室本体周縁部２０側に向いて開口した空洞のチョーク溝
２３が形成されている。そして、漏波路２２の長さおよ
びチョーク溝２３の深さはそれぞれ電波（電子レンジの
場合には、２.4５ＧＨZ ）の１／４波長（約３０mm）に
設定されている。λ／４チョーク方式というのは、チョ
ーク溝２３の開口部のＢ点から底部のＣ点（短絡部）を
見たインピーダンスを無限大の開放状態とすることと、
漏波路２２の入口端Ａ点からチョーク溝開口部のＢ点を
見たときのインピーダンスを短絡状態にすることを利用
した電波シール法である。2. Description of the Related Art As a conventional radio wave sealing device, λ / 4
There is a choke method that uses impedance inversion. In FIG. 6, 20 is the peripheral portion of the heating chamber main body of the microwave oven made of metal such as stainless steel and iron, and 21 is stainless steel.
It is the peripheral portion of the door that can be opened and closed and is made of metal such as iron.
A gap between the heating chamber main body peripheral portion 20 and the door peripheral portion 21 is a leakage waveguide 22, and a hollow choke groove 23 opened toward the heating chamber main body peripheral portion 20 side is provided outside the leakage waveguide 22 of the door peripheral portion 21. Has been formed. The length and respective depth wave choke groove 23 of the leakage waveguide 22 (in the case of a microwave oven, 2.45 GHz Z) is set to 1/4 wavelength (about 30 mm) of. The λ / 4 choke method is to set the impedance from the point B at the opening of the choke groove 23 to the point C (short-circuited portion) at the bottom to an infinite open state,
This is a radio wave sealing method that utilizes shorting of the impedance when the point B of the opening of the choke groove is seen from the point A of the entrance end of the leaky waveguide 22.

【０００３】すなわち、チョーク溝２３の特性インピー
ダンスをＺOC、深さをＬc として、終端部（底部Ｃ）を
短絡したときにチョーク開口部ＢでのインピーダンスＺ
B は、 ＺB ＝ｊＺOCｔａｎ（２πＬc ／λo ） （λo は自由空間波長）となる。チョーク方式の電波減
衰手段は、チョーク溝２３の深さＬc を４分の１波長に
選定することにより、｜ＺB ｜＝ＺOCｔａｎ（π／２）
＝∞を達成するという原理に基づいている。また、漏波
路２２の特性インピーダンスをＺOP、長さをＬp とし
て、溝開口部ＢのインピーダンスＺB を漏波路２２のＡ
点でみたときのインピーダンスＺA は、 ＺA ＝−ｊＺOP／ｔａｎ（２πＬp ／λo ） （λo は自由空間波長）となる。ここで、Ｌp ＝λ／４
と選ぶことにより、｜ＺA ｜＝０と変換できる。That is, when the characteristic impedance of the choke groove 23 is Z OC and the depth is L c , the impedance Z at the choke opening B when the terminal end (bottom C) is short-circuited.
B becomes Z B = jZ OC tan (2πL c / λ o ), where λ o is a free space wavelength. The choke type radio wave attenuation means selects | Z B | = Z OC tan (π / 2) by selecting the depth L c of the choke groove 23 to be a quarter wavelength.
It is based on the principle of achieving = ∞. Further, assuming that the characteristic impedance of the leaky waveguide 22 is Z OP and the length thereof is L p , the impedance Z B of the groove opening B is A of the leaky waveguide 22.
Impedance Z A when viewed from the point is, the Z A = -jZ OP / tan ( 2πL p / λ o) (λ o is the free space wavelength). Where L p = λ / 4
By selecting, it can be converted to | Z A | = 0.

【０００４】このように、チョーク溝２３の底面Ｃでの
短絡状態が１／４波長インピーダンス変換原理を巧みに
利用することで、漏波路始点に現出することにより電波
シール装置として実用化しているものである。As described above, the short-circuited state at the bottom surface C of the choke groove 23 is practically utilized as a radio wave sealing device by revealing at the starting point of the leaky waveguide by skillfully utilizing the principle of ¼ wavelength impedance conversion. It is a thing.

【０００５】次に、別の従来例として特公昭６３−１３
３１９号公報の構成を図７および図８に示す。図７にお
いて、２４は加熱室本体の周縁部、２５は加熱室本体を
開閉自在に覆うドアの周縁部である。ドア周縁部２５に
は、加熱室本体周縁部２４側に向いて開口した底面とそ
の両側に配置された壁面群からなる小型溝２６を設けて
いる。前記従来例と相違する点は、小型溝２６の開口部
Ｄの溝幅Ｂ１を短絡部Ｅ（溝底面）の溝幅Ｂ２よりも小
さくなるように、小型溝２６を構成する外側壁面２７を
溝の内側にＬ字状に折り曲げて、溝底部と平行な部分２
８ａと垂直な部分２８ｂを有する突出部２８を設け、さ
らに、突出部２８および外側壁面２７には、溝の長手方
向にピッチＰよりも導体幅Ａ１が小さくなるようにスリ
ットＳを設けるとともに、溝開口部Ｄ側の導体幅Ａ１を
短絡部Ｅ側の導体幅Ａ２よりも大きくした点にある。Next, as another conventional example, Japanese Patent Publication No. 63-13
The configuration of Japanese Patent No. 319 is shown in FIGS. 7 and 8. In FIG. 7, reference numeral 24 is a peripheral edge portion of the heating chamber main body, and 25 is a peripheral edge portion of the door that covers the heating chamber main body in an openable and closable manner. The door peripheral edge portion 25 is provided with a small groove 26 formed of a bottom surface opening toward the heating chamber main body peripheral edge portion 24 side and wall surface groups arranged on both sides thereof. The difference from the conventional example is that the outer wall surface 27 forming the small groove 26 is formed so that the groove width B1 of the opening D of the small groove 26 is smaller than the groove width B2 of the short circuit portion E (groove bottom surface). Bend into the inside of the L shape, and the part 2 parallel to the groove bottom
8a is provided with a protrusion 28 having a portion 28b perpendicular to the groove 8a. Further, the protrusion 28 and the outer wall surface 27 are provided with a slit S so that the conductor width A1 is smaller than the pitch P in the longitudinal direction of the groove. The point is that the conductor width A1 on the opening D side is made larger than the conductor width A2 on the short circuit portion E side.

【０００６】この方式は、新たなインピーダンス変換原
理を用いた電波シールであり、漏波路と溝のそれぞれが
特性インピーダンス不連続構成をとることにより、４分
の１波長の寸法よりも小さくできるようにしたものであ
る（λ／４未満インピーダンス反転方式と呼ぶ）。This system is a radio wave seal using a new impedance conversion principle, and each of the leaky waveguide and the groove has a characteristic impedance discontinuous structure so that the size can be made smaller than a quarter wavelength. (Impedance inversion method less than λ / 4).

【０００７】小型化を可能にする基本的な考え方は次の
とおりである。溝開口部Ｄの特性インピーダンス、長
さ、位相定数をＺ01、Ｌ１、β1 とする。溝短絡部Ｅの
特性インピーダンス、長さ、位相定数をＺ02、Ｌ２、β
2 とする。溝開口部Ｄ端から短絡部Ｅ端までの距離（溝
の深さ）をＬ（ｔｏｔａｌ）とするとＬ（ｔｏｔａｌ）
＝Ｌ１＋Ｌ２となる。The basic idea that enables miniaturization is as follows. The characteristic impedance, length, and phase constant of the groove opening D are Z 01 , L1, and β 1 . Set the characteristic impedance, length, and phase constant of the groove short-circuit portion E to Z 02 , L2, β.
Set to 2 . Let L (total) be the distance from the D end of the groove opening to the E end of the short-circuited portion, L (total)
= L1 + L2.

【０００８】上記条件で溝の開口部Ｄのインピーダンス
Ｚは、 Ｚ＝ｊＺ01（ｔａｎβ1 Ｌ１＋Ｋｔａｎβ2 Ｌ２）／ （１−Ｋｔａｎβ1 Ｌ１・ｔａｎβ2 Ｌ２） （但し、Ｋ＝Ｚ02／Ｚ01）となることは、簡単な計算で
導くことができる。Under the above conditions, the impedance Z of the opening D of the groove is Z = jZ 01 (tan β 1 L1 + Ktan β 2 L2) / (1-Ktan β 1 L1 · tan β 2 L2) (where K = Z 02 / Z 01 ). Can be derived by a simple calculation.

【０００９】チョーク方式では、Ｚ02＝Ｚ01、β1 ＝β
2 （即ちＫ＝１）に相当するものである。一方、この方
式では、特性インピーダンスをＺ02＞Ｚ01とすることに
より、Ｋの値は必ず１より大きくなる。インピーダンス
Ｚを無限大にするためには上式の分母が零になればよい
ので１＝Ｋｔａｎβ1 Ｌ１・ｔａｎβ2 Ｌ２を満たせば
よく、Ｋの値を１より大きくした分だけ寸法Ｌ１、Ｌ２
を小さくしても同様のインピーダンス反転が図れる。In the choke system, Z 02 = Z 01 , β 1 = β
2 (that is, K = 1). On the other hand, in this method, the value of K is always larger than 1 by setting the characteristic impedance to Z 02 > Z 01 . In order to make the impedance Z infinite, the denominator of the above equation should be zero, so 1 = Ktanβ 1 L1 · tanβ 2 L2 should be satisfied, and the dimensions L1 and L2 should be increased by the amount of K being larger than 1.
Similar impedance reversal can be achieved even if the value is reduced.

【００１０】詳細には、溝開口部Ｄ側の導体幅をＡ１、
溝幅をＢ１、実効誘電率をεeff とし溝短絡部Ｅ側の幅
をＡ２、間隙をＢ２とした構成で、特性インピーダンス
の比Ｋを、Specifically, the conductor width on the groove opening D side is A1,
The groove width is B1, the effective dielectric constant is ε eff , the groove short circuit portion E side width is A2, and the gap is B2.

【００１１】[0011]

【数１】 [Equation 1]

【００１２】で計算し、Ｋの値を１より大きくなるよう
にすることで特性インピーダンスを不連続にしている。[0012] The characteristic impedance is discontinuous by calculating K and making the value of K larger than 1.

【００１３】なお、本従来例の展開においては、図８に
示したように、小型溝の内側に、Ｌ字状の突出部２９を
設けてもよい。In the development of this conventional example, as shown in FIG. 8, an L-shaped protrusion 29 may be provided inside the small groove.

【００１４】図９に、図７の電波シール装置のオーブン
電子レンジにおける具体的な実施態様を示した。ドア２
５を鉄板のプレス加工により成型し、ドア２５の周縁部
にコの字状に端部を折り曲げてこれと一体に設けたり、
あるいは別部品としてのドアシール金具をスポット溶接
により取り付けて電波ドアシール装置を構成している。
ドア２５の加熱室側の中央部には、加熱室を透視するた
めのパンチングメタル３０をドア２５にスポット溶接す
るとともに、ドア２５の内・外表面には、直接使用者の
手が触れたり、金属製の異物が挿入されたりして、パン
チングメタル３０の電波遮蔽性能を損なうことが無いよ
うに耐熱ガラス板３１、３２をシリコーンパテにより装
着している。図９（ｂ）にコーナー部を加熱室側から見
た正面図を示したが、突出部２８の形状をそのままで縦
・横方向の突出部２８をコーナー部では接近させてい
る。これまでの経験から、実機において電波漏洩量の大
きいのはコーナー部であり、コーナー部においては未だ
明確な電波シール理論がなく試行錯誤的に決めているの
が実態である。言い替えると、コーナー部以外のところ
ではもう少し電波シールサイズを小さくすることができ
るが、基本構造を変えることなくコーナー部での電波漏
洩量を小さくするために電波シールサイズを逆に大きく
設計している。FIG. 9 shows a concrete embodiment of the microwave sealing apparatus of FIG. 7 in the oven microwave oven. Door 2
5 is formed by pressing an iron plate, the end is bent in a U-shape around the periphery of the door 25, and the door 25 is integrally provided with the end.
Alternatively, a radio wave door seal device is constructed by attaching a door seal fitting as a separate component by spot welding.
A punching metal 30 for seeing through the heating chamber is spot-welded to the door 25 at the center of the door 25 on the heating chamber side, and the inner and outer surfaces of the door 25 are directly touched by the user's hand, The heat-resistant glass plates 31 and 32 are attached by silicone putty so that the foreign matter made of metal is not impaired and the radio wave shielding performance of the punching metal 30 is not impaired. FIG. 9B shows a front view of the corner portion viewed from the heating chamber side. The shape of the protruding portion 28 is left unchanged, and the protruding portions 28 in the vertical and horizontal directions are made to approach each other at the corner portion. From the experience so far, it is the corner portion that the amount of radio wave leakage is large in the actual machine, and the fact is that there is no clear radio wave sealing theory in the corner portion and it is decided by trial and error. In other words, the radio wave seal size can be made a little smaller in areas other than the corners, but the radio wave seal size is designed to be large to reduce the amount of radio wave leakage at the corners without changing the basic structure. .

【００１５】[0015]

【発明が解決しようとする課題】しかし、上記従来のチ
ョーク方式の構成では、加熱室からチョーク溝２３まで
の距離およびチョーク溝２３の深さ（電波共振溝寸法）
をマイクロ波の１／４波長（約３０mm）にとることが必
要条件であり、加熱室本体から溝外壁面までの長さは４
０mm程度必要であった。However, in the above-mentioned conventional choke system configuration, the distance from the heating chamber to the choke groove 23 and the depth of the choke groove 23 (radio resonance groove size).
Is required to be 1/4 wavelength (about 30 mm) of microwave, and the length from the heating chamber body to the outer wall surface of the groove is 4
About 0 mm was needed.

【００１６】また、λ／４未満反転方式の構成では、溝
開口部の特性インピーダンスを無限大にすれば良く、チ
ョーク方式に比べて、加熱室から溝までの距離（コンタ
クト部と呼ぶ）および溝の深さを短縮できるものの、実
際の漏波が図７に示すＸおよびＺ方向成分の合成であ
り、前述した理論はＺ方向（溝を横切る方向）の成分の
漏波に対するもので、Ｘ方向（溝の長手方向）の漏波に
対してはいまだ明確な理論がない。そのため実用の際に
は、コンタクト部および溝の幅をそれぞれ１０mmおよび
１５mmずつ必要であり、全体としての電波シール装置の
幅は２５mm程度となっていた。Further, in the structure of less than λ / 4 inversion method, the characteristic impedance of the groove opening may be set to infinity, and the distance from the heating chamber to the groove (referred to as a contact portion) and the groove are different from those of the choke method. However, the actual leakage wave is a combination of the X and Z direction components shown in FIG. 7, and the theory described above is for the leakage wave of the component in the Z direction (direction crossing the groove). There is still no clear theory for leakage waves (in the longitudinal direction of the groove). Therefore, in practical use, the width of the contact portion and the width of the groove must be 10 mm and 15 mm, respectively, and the width of the radio wave sealing device as a whole is about 25 mm.

【００１７】ところで、近年、デザインを含めた商品戦
略の観点から、電波シール装置のサイズを小さくしたい
というニーズが強くなっている。シール装置を小さくで
きれば、同じ加熱室容量であれば外観サイズをコンパク
トに、あるいは外観サイズが同じであれば加熱室容量を
増すことができて一度に多量の調理をすることができ
る。By the way, in recent years, from the viewpoint of product strategy including design, there is an increasing need to reduce the size of the radio wave sealing device. If the sealing device can be made smaller, the appearance size can be made compact with the same heating chamber capacity, or the heating chamber capacity can be increased if the appearance size is the same, and a large amount of cooking can be performed at one time.

【００１８】そのため、フェライトなどの磁性粉末を樹
脂やゴムなどの高分子材料に混練・成型してなる電波吸
収体を装着してこれにより漏洩電波を吸収して電波シー
ル装置を小型化する試みがあるが、実用には至っていな
い。Therefore, an attempt has been made to mount a radio wave absorber formed by kneading and molding a magnetic powder such as ferrite in a polymer material such as resin or rubber, thereby absorbing leaked radio waves and downsizing the radio wave sealing device. However, it has not been put to practical use.

【００１９】本発明は上記課題を解決するもので、より
小型の電波シール装置を提供することを目的としたもの
である。The present invention has been made to solve the above problems, and an object thereof is to provide a smaller radio wave sealing device.

【００２０】[0020]

【課題を解決するための手段】上記目的を達成するため
に、本発明の電波シール装置は、開口部を有し、かつ電
波が内部に供給される導電材からなる箱型の加熱室の開
口部周縁の本体周縁部と、前記加熱室の開口部を開閉自
在に覆う導電材からなるドアの周縁部と、前記加熱室の
本体周縁部とこれに対向して設けられたドア周縁部との
少なくともどちらか一方に設けられ、導電性壁面群によ
り構成された底面と両側壁面よりなる溝開口部と短絡部
とを有する凹状溝と、前記溝開口部の溝幅が短絡部の溝
幅よりも狭くなるように、少なくともいずれかの溝側面
上部から溝中央に向かって突出する導電材からなる突出
部と、前記突出部を含む溝開口部を覆う溝被覆体とから
なり、前記突出部と少なくとも前記壁面群の１つに、溝
の長手方向に導体幅がピッチよりも小さくなるように複
数のスリットを設け、かつ溝開口部の導体幅を短絡部の
導体幅よりも大きくする構成とし、前記加熱室のコーナ
ー部分では、前記凹状溝の内側壁面に半径Ｒの曲線を持
たせるとともに、少なくとも前記内側面と等距離を保つ
ように突出部端面に半径Ｒ１の曲線を持たせた構成とし
た。In order to achieve the above object, a radio wave sealing device of the present invention has an opening of a box-shaped heating chamber having an opening and made of a conductive material into which radio waves are supplied. A peripheral edge of the main body, a peripheral edge of a door made of a conductive material that covers the opening of the heating chamber in an openable and closable manner, a peripheral edge of the main body of the heating chamber, and a peripheral edge of the door provided opposite to the main peripheral edge of the heating chamber. A recessed groove provided on at least one of the conductive wall surface groups and having a groove opening consisting of a bottom surface and both side wall surfaces and a short-circuited portion, and the groove width of the groove opening is larger than the groove width of the short-circuited portion. At least one of the groove side surfaces is formed so as to be narrower and protrudes toward the center of the groove from an upper portion of the groove side surface, and a groove cover that covers the groove opening including the protrusion is formed. One of the wall groups has a conductor in the longitudinal direction of the groove. Is provided with a plurality of slits so that the groove width is smaller than the pitch, and the conductor width of the groove opening is larger than the conductor width of the short-circuited portion, and in the corner portion of the heating chamber, the inner wall surface of the concave groove has a radius. In addition to having a curve of R, the projection end face has a curve of radius R1 so as to keep at least the same distance as the inner side surface.

【００２１】さらに、開口部を有し、かつ電波が内部に
供給される導電材からなる箱型の加熱室の開口部周縁の
本体周縁部と、前記加熱室の開口部を開閉自在に覆う導
電材からなるドアの周縁部と、前記加熱室の本体周縁部
とこれに対向して設けられたドア周縁部との少なくとも
どちらか一方に設けられ、導電性壁面群により構成され
た底面と両側壁面よりなる溝開口部と短絡部とを有する
凹状溝と、前記溝開口部の溝幅が短絡部の溝幅よりも狭
くなるように、溝開口部端面から溝の内部に向かって突
出する導電材からなる突出部と、前記突出部を含む溝開
口部を覆う溝被覆体とからなり、前記突出部と少なくと
も前記壁面群の１つに、溝の長手方向に導体幅がピッチ
よりも小さくなるように複数のスリットを設け、かつ溝
開口部の導体幅を短絡部の導体幅よりも大きくする構成
とし、前記構成のコーナー部分に電波吸収体を装着した
構成とした。Furthermore, a box-shaped heating chamber made of a conductive material into which an electric wave is supplied and having an opening, and a main body peripheral portion of the opening peripheral edge, and a conductive material that covers the opening of the heating chamber in an openable and closable manner. Bottom surface and both side wall surfaces that are provided on at least one of the peripheral edge of the door made of a material, the peripheral edge of the main body of the heating chamber, and the peripheral edge of the door provided opposite to the main wall A concave groove having a groove opening and a short-circuit portion, and a conductive material protruding from the end surface of the groove opening toward the inside of the groove so that the groove width of the groove opening is narrower than the groove width of the short-circuit portion. And a groove cover that covers the groove opening including the protrusion, and the conductor width is smaller than the pitch in the longitudinal direction of the groove on the protrusion and at least one of the wall surface groups. Provide multiple slits in the It is configured to be larger than the conductor width of the junction, and the structure of mounting the wave absorber to the corner portion of the structure.

【００２２】[0022]

【作用】本発明は、上記構成において、基本構造として
は、溝開口部の溝幅を短絡部の溝幅よりも小さくしたこ
と、および溝開口部の導体幅を短絡部の導体幅よりも大
きくした点で、λ／４未満インピーダンス反転方式を踏
襲しながら、溝開口部に設けた突出部と対向する壁面間
あるいは２つの突出部間で、一種のコンデンサーが形成
され、そこで生ずるキャパシタンスと溝底部のインダク
タンスとの間で共振が起こり、溝の深さが電波の１／４
波長よりも小さい条件でも溝開口部のインピーダンスを
無限大にすることができる。また、コーナー部において
も基本構成を維持できる。According to the present invention, in the above structure, the basic structure is that the groove width of the groove opening is smaller than the groove width of the short circuit portion, and the conductor width of the groove opening is larger than the conductor width of the short circuit portion. In this respect, while following the impedance reversal method of less than λ / 4, a kind of capacitor is formed between the wall surface facing the protrusion provided in the groove opening or between the two protrusions, and the capacitance generated there and the groove bottom portion. Resonance occurs with the inductance of, and the depth of the groove is 1/4 of the radio wave.
The impedance of the groove opening can be made infinite even under the condition of being smaller than the wavelength. In addition, the basic structure can be maintained at the corners.

【００２３】[0023]

【実施例】（実施例１）以下、本発明の第１の実施例を
図１を用いて説明する。(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIG.

【００２４】まず、電波シール装置の基本構成図を図１
（ｂ）および（ｃ）で説明する。図に示すように、加熱
室を構成する金属からなる本体の周縁部１と、加熱室本
体の開口部を開閉自在に覆うドアの周縁部２に凹状溝３
を形成している。凹状溝３は底面４と両側壁面５・６か
らなり、溝開口部Ｂと短絡部Ｃを有している。この凹状
溝３の開口部Ｂの溝幅を短絡部Ｃの溝幅よりも狭くする
ために、ここでは外側壁面６の端部を溝底面４と平行に
溝内側に折り曲げて、これと一体に突出部７を設けてい
る。また、突出部７および両側壁面５・６には、溝の長
手方向にそれらの導体幅Ａ１がピッチＰよりも小さくな
るようにスリット６Ｓを設け、かつ、突出部７の導体幅
Ａ１よりも短絡部Ｃ（ここでは外側壁面６）の導体幅Ａ
２を小さくしている。さらに、溝開口部Ｂには誘電体と
して、例えば、ポリエステル樹脂等の溝被覆体８を設け
ている。そして、コーナー部分においては図１（ａ）で
示したように、突出部７の形状をドア周縁部２のプレス
加工により生じた内側壁面５の半径Ｒの曲線に対応して
端部が内側壁面５と等距離を保つような、即ち端部が内
側壁面５の半径Ｒの曲線と同心円となる半径Ｒ１の曲線
を有する突出部９および１０を対称的に設けている。First, FIG. 1 is a basic configuration diagram of the radio wave sealing device.
This will be described in (b) and (c). As shown in the figure, a concave groove 3 is formed in a peripheral edge portion 1 of a metal body that constitutes the heating chamber and a peripheral edge portion 2 of a door that covers the opening of the heating chamber main body in an openable and closable manner.
Is formed. The concave groove 3 is composed of a bottom surface 4 and both side wall surfaces 5 and 6, and has a groove opening B and a short circuit portion C. In order to make the groove width of the opening B of the concave groove 3 narrower than the groove width of the short circuit portion C, here, the end portion of the outer wall surface 6 is bent in parallel to the groove bottom surface 4 inside the groove, and integrated with this. A protrusion 7 is provided. In addition, the protrusion 7 and the side wall surfaces 5 and 6 are provided with slits 6S in the longitudinal direction of the groove so that their conductor width A1 is smaller than the pitch P, and are shorter than the conductor width A1 of the protrusion 7. Conductor width A of part C (here, outer wall surface 6)
2 is reduced. Further, the groove opening 8 is provided with a groove cover 8 such as polyester resin as a dielectric. Then, at the corner portion, as shown in FIG. 1A, the end portion has an inner wall surface corresponding to the curve of the radius R of the inner wall surface 5 formed by pressing the door peripheral portion 2 in the shape of the protruding portion 7. 5, the projections 9 and 10 are symmetrically provided so as to keep the same distance, that is, the end has a curve of radius R1 which is concentric with the curve of radius R of the inner wall surface 5.

【００２５】この基本構造のみの場合、例えば、箱型電
子レンジにおける１辺のみの漏波実験のような場合に
は、各部の寸法を次のようにしたとき、電波漏洩量は、
ギャップＧ（加熱室本体周縁部１とドア周縁部２との隙
間）１mmで０.1ｍＷ／mm2 、ギャップ３.5mmで１.5ｍＷ
／mm2 であり、実用上十分な電波シール性能を有するド
ア周縁部２と突出部７との高さの違いＴを２mm、コンタ
クト部の幅Ｍを６mm、凹状溝の内幅Ｂ２を１０mm、突出
部７の幅を８mm、突出部７と内側壁面５の間隙幅Ｂ１を
３mm、溝長手方向のスリットのピッチＰを２０mm、突出
部７の導体幅Ａ１を１５mm、スリット幅Ｓおよび外側壁
面６の導体幅Ａ２をそれぞれ５mm、外側壁面６の開口部
分の導体長さＬ１を１mm（板厚そのもの）、溝の深さＬ
を１５mmとした。なお、外側壁面６の溝深さ方向の導体
長さＬ１が５mmでも特性変化がないことを確認してい
る。In the case of only this basic structure, for example, in the case of a leaky wave experiment of only one side in a box type microwave oven, when the dimensions of each part are set as follows, the amount of radio wave leakage is
Gap G (gap between heating chamber body peripheral edge 1 and door peripheral edge 2) 0.1 mW / mm 2 at 1 mm, 1.5 mW at gap 3.5 mm
/ Mm 2, which has a practically sufficient radio wave sealing performance, the height difference T between the door peripheral edge portion 2 and the protruding portion 7 is 2 mm, the contact portion width M is 6 mm, and the concave groove inner width B2 is 10 mm, The width of the protruding portion 7 is 8 mm, the gap width B1 between the protruding portion 7 and the inner wall surface 5 is 3 mm, the slit pitch P in the groove longitudinal direction is 20 mm, the conductor width A1 of the protruding portion 7 is 15 mm, the slit width S and the outer wall surface 6 The conductor width A2 of each is 5 mm, the conductor length L1 of the opening portion of the outer wall surface 6 is 1 mm (the plate thickness itself), and the groove depth L is
Was set to 15 mm. It has been confirmed that there is no characteristic change even when the conductor length L1 of the outer wall surface 6 in the groove depth direction is 5 mm.

【００２６】しかし、コーナー部分においては基本構造
のままでは、各部の寸法関係、特に突出部７と内側壁面
５との距離が離れて電波漏洩量は著しく大きくなる。そ
こで、基本構造を踏まえて図１（ａ）に示したようなコ
ーナー部の突出部９および１０を対称的に設けた。この
とき、電波シール性能は上記の基本構造の場合と同様で
あった。なお、図１（ａ）、（ｂ）では溝被覆体８は省
略している。However, in the corner portion, if the basic structure is kept as it is, the dimensional relationship of each portion, especially the distance between the projecting portion 7 and the inner wall surface 5 is increased, and the amount of radio wave leakage is significantly increased. Therefore, based on the basic structure, the protrusions 9 and 10 at the corners as shown in FIG. 1A are provided symmetrically. At this time, the radio wave sealing performance was similar to that of the above basic structure. The groove covering 8 is omitted in FIGS. 1 (a) and 1 (b).

【００２７】（実施例２）次に、本発明の第２の実施例
について図２を用いて説明する。前記第１の実施例では
コーナー部の突出部９および１０を対称的に設けたが、
ここでは、一方の突出部１１のみの端面に半径Ｒ１の曲
線を設けている。この場合にも、電波シール性能は上記
の基本構造の場合と同様であった。(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the corner projections 9 and 10 are provided symmetrically,
Here, a curve having a radius R1 is provided on the end surface of only one of the protrusions 11. In this case as well, the radio wave sealing performance was similar to that of the above basic structure.

【００２８】（実施例３）次に、本発明の第３の実施例
について、図３を用いて説明する。前記第１の実施例と
相違する点は、コーナー部分に電波吸収体１２を設けた
点にある。電波吸収体１２としては、フェライト系材
料、例えば、（Ｍｇ，Ｃｕ，Ｆｅ，Ｚｎ）Ｏ、Ｆｅ2 Ｏ
3 とシリコーンレジンコンポジットなどが好ましい。こ
の場合にも、電波シール性能は上記の基本構造の場合と
同様であった。(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIG. The difference from the first embodiment is that the radio wave absorber 12 is provided at the corner portion. As the radio wave absorber 12, a ferrite material such as (Mg, Cu, Fe, Zn) O or Fe 2 O is used.
3 and silicone resin composite are preferred. In this case as well, the radio wave sealing performance was similar to that of the above basic structure.

【００２９】（実施例４）次に、本発明の第４の実施例
について、図４を用いて説明する。基本構造において、
前記第１の実施例と相違する点は、図４（ｃ）に示した
ように、溝開口部の両側壁面から溝底部と平行に溝内部
に突出する２つの突出部１３・１４を設けた点にある。
ここでは、内面側突出部１３を加熱室内を見るためのパ
ンチングメタル等のスクリーン材１５をドア本体２との
間で固定する押え板１６として兼用した例を示した。ま
た、外面側突出図１４は、外側壁面６を内側に折り曲げ
てこれと一体に設けた。そして、コーナー部分では、内
面側・外面側突出部の端面にそれぞれ半径Ｒ１，Ｒ２の
曲線を設けた。基本構造における内面側・外面側突出部
１３，１４の溝内への張り出し部分の長さをともに４m
m、溝内幅を１０mmとしたときの電波シール性能は前記
実施例同様良好であった。(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG. In the basic structure,
The difference from the first embodiment is that, as shown in FIG. 4 (c), two projecting portions 13 and 14 projecting from both side wall surfaces of the groove opening portion into the groove parallel to the groove bottom portion are provided. In point.
Here, an example is shown in which the inner surface side protruding portion 13 is also used as the holding plate 16 for fixing the screen material 15 such as punching metal for viewing the heating chamber to the door body 2. Further, in FIG. 14 showing the outer surface side, the outer wall surface 6 is bent inward and provided integrally therewith. Then, in the corner portion, curves having radii R1 and R2 are provided on the end surfaces of the inner surface side and outer surface side protrusions, respectively. In the basic structure, both the inner and outer protrusions 13 and 14 projecting into the groove have a length of 4 m.
The radio wave sealing performance when the width m and the groove width were 10 mm was as good as in the above-mentioned examples.

【００３０】（実施例５）次に、本発明の第５の実施例
について、図５を用いて説明する。図５において第４の
実施例と相違する点は、コーナー部分に電波吸収体１２
を設けたことにある。電波シール性能は第４の実施例と
同様であった。(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG. 5 is different from the fourth embodiment in that the electromagnetic wave absorber 12 is provided at the corner portion.
Has been established. The radio wave sealing performance was similar to that of the fourth embodiment.

【００３１】なお、第４および第５の実施例において、
一方の突出部を平板状として、他方の突出部を従来例の
項で述べたコの字状としても良い。In the fourth and fifth embodiments,
One protrusion may be flat and the other protrusion may be U-shaped as described in the section of the conventional example.

【００３２】以上述べたように、本発明の何れの実施例
においても、電波シール装置の開口部端面から溝最外壁
面までの寸法を１７mm、コンタクト部から溝底面外面ま
での寸法を２０mm以内とすることができる。また、前述
した寸法のままでコーナー部の電波シール性能を良好に
維持できる。As described above, in any of the embodiments of the present invention, the dimension from the end face of the opening of the radio wave sealing device to the outermost wall surface of the groove is 17 mm, and the dimension from the contact part to the outer surface of the groove bottom is within 20 mm. can do. In addition, the radio wave sealing performance at the corner can be favorably maintained with the above-described dimensions.

【００３３】[0033]

【発明の効果】以上の説明から明らかなように、本発明
の電波シール装置によれば、基本構成部はもとより、コ
ーナー部においても突出部と対向する壁面、あるいは２
つの突出部間の間隔を保持する構成としたため電波シー
ル装置のサイズを大幅に小型化できる。よって、デザイ
ンを含めた商品戦略上極めて有効な電子レンジを提供で
きる。As is clear from the above description, according to the radio wave sealing device of the present invention, not only the basic constituent parts but also the wall surface facing the protruding part at the corner part or 2
Since the distance between the two protrusions is maintained, the size of the radio wave sealing device can be significantly reduced. Therefore, it is possible to provide a microwave oven which is extremely effective in product strategy including design.

【図面の簡単な説明】[Brief description of drawings]

【図１】（ａ）本発明の第１の実施例の電波シール装置
のコーナー部の正面図 （ｂ）同、電波シール装置の側面図 （ｃ）同、（ａ）のＸＹ断面図FIG. 1A is a front view of a corner portion of a radio wave sealing device according to a first embodiment of the present invention, FIG. 1B is a side view of the radio wave sealing device, and FIG. 1C is an XY sectional view of FIG.

【図２】（ａ）本発明の第２の実施例の電波シール装置
のコーナー部の正面図 （ｂ）同、側面図FIG. 2A is a front view of a corner portion of a radio wave sealing device according to a second embodiment of the present invention. FIG.

【図３】（ａ）本発明の第３の実施例の電波シール装置
のコーナー部の正面図 （ｂ）同、側面図FIG. 3A is a front view of a corner portion of a radio wave sealing device according to a third embodiment of the present invention. FIG. 3B is a side view of the same.

【図４】（ａ）本発明の第４の実施例の電波シール装置
のコーナー部の断面図 （ｂ）同、側面図 （ｃ）同、（ａ）のＸＹ断面図FIG. 4A is a sectional view of a corner portion of a radio wave sealing device according to a fourth embodiment of the present invention. FIG. 4B is a side view of the same. FIG. 4C is an XY sectional view of FIG.

【図５】（ａ）本発明の第５の実施例の電波シール装置
のコーナー部の正面図 （ｂ）同、側面図FIG. 5 (a) is a front view of a corner portion of a radio wave sealing device according to a fifth embodiment of the present invention. FIG.

【図６】（ａ）従来の電波シール装置の断面図 （ｂ）同、側面図6A is a sectional view of a conventional radio wave sealing device, and FIG. 6B is a side view of the same.

【図７】（ａ）従来の別の電波シール装置の断面図 （ｂ）同、側面図FIG. 7A is a cross-sectional view of another conventional radio wave sealing device, and FIG. 7B is a side view of the same.

【図８】（ａ）従来の別の電波シール装置の断面図 （ｂ）同、側面図FIG. 8A is a cross-sectional view of another conventional radio wave sealing device, and FIG. 8B is a side view of the same.

【図９】（ａ）図７に示すオーブン電子レンジにおける
電波シール装置の断面図 （ｂ）同、コーナー部の正面図9 (a) is a cross-sectional view of the radio wave sealing device in the oven microwave oven shown in FIG. 7 (b) is a front view of the same corner portion.

【符号の説明】[Explanation of symbols]

１ 本体周縁部 ２ ドア周縁部 ３ 凹状溝 ４ 底面 ５ 内側壁面 ６ 外側壁面 ６Ｓ 外側壁面のスリット ７ 突出部 ８ 溝被覆体 1 Main Body Peripheral Part 2 Door Peripheral Part 3 Recessed Groove 4 Bottom 5 Inner Wall 6 Outer Wall 6S Outer Wall Slit 7 Projection 8 Groove Cover

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】開口部を有し、かつ電波が内部に供給され
る導電材からなる箱型の加熱室の開口部周縁の本体周縁
部と、前記加熱室の開口部を開閉自在に覆う導電材から
なるドアの周縁部と、前記加熱室の本体周縁部とこれに
対向して設けられたドア周縁部との少なくともどちらか
一方に設けられ、導電性壁面群により構成された底面と
両側壁面よりなる溝開口部と短絡部とを有する凹状溝
と、前記溝開口部の溝幅が短絡部の溝幅よりも狭くなる
ように、少なくともいずれかの溝側面上部から溝中央に
向かって突出する導電材からなる突出部と、前記突出部
を含む溝開口部を覆う溝被覆体とからなり、前記突出部
と少なくとも前記壁面群の１つに、溝の長手方向に導体
幅がピッチよりも小さくなるように複数のスリットを設
け、かつ溝開口部の導体幅を短絡部の導体幅よりも大き
くする構成とし、前記加熱室のコーナー部分では、前記
凹状溝の内側壁面に半径Ｒの曲線を持たせるとともに、
少なくとも前記内側面と等距離を保つように突出部端面
に半径Ｒ１の曲線を持たせた電波シール装置。1. A main body peripheral portion of an opening peripheral portion of a box-shaped heating chamber having an opening and made of a conductive material into which radio waves are supplied, and a conductive material that covers the opening of the heating chamber so as to be openable and closable. Bottom surface and both side wall surfaces that are provided on at least one of the peripheral edge of the door made of material, the peripheral edge of the main body of the heating chamber, and the peripheral edge of the door that faces the main chamber A concave groove having a groove opening and a short-circuited portion, and protruding toward the center of the groove from at least one of the groove side surface upper portions so that the groove width of the groove opening is narrower than the groove width of the short-circuited portion. It is composed of a protrusion made of a conductive material and a groove cover that covers the groove opening including the protrusion, and the conductor width is smaller than the pitch in the longitudinal direction of the groove on the protrusion and at least one of the wall surface groups. Multiple slits so that the groove opening Is configured to be larger than the conductor width of the short-circuit portion of the body width, the corner portion of the heating chamber, causes no curve of radius R on the inside wall surface of the concave groove,
A radio wave sealing device in which the end face of the protrusion has a curve with a radius R1 so as to keep at least the same distance as the inner side face. 【請求項２】開口部を有し、かつ電波が内部に供給され
る導電材からなる箱型の加熱室の開口部周縁の本体周縁
部と、前記加熱室の開口部を開閉自在に覆う導電材から
なるドアの周縁部と、前記加熱室の本体周縁部とこれに
対向して設けられたドア周縁部との少なくともどちらか
一方に設けられ、導電性壁面群により構成された底面と
両側壁面よりなる溝開口部と短絡部とを有する凹状溝
と、前記溝開口部の溝幅が短絡部の溝幅よりも狭くなる
ように、溝開口部端面から溝の内部に向かって突出する
導電材からなる突出部と、前記突出部を含む溝開口部を
覆う溝被覆体とからなり、前記突出部と少なくとも前記
壁面群の１つに、溝の長手方向に導体幅がピッチよりも
小さくなるように複数のスリットを設け、かつ溝開口部
の導体幅を短絡部の導体幅よりも大きくする構成とし、
前記構成のコーナー部分に電波吸収体を装着した電波シ
ール装置。2. A conductive body that has an opening and that covers the opening of the heating chamber so as to be openable and closable, and a peripheral portion of the main body of the opening of the box-shaped heating chamber made of a conductive material into which radio waves are supplied. Bottom surface and both side wall surfaces that are provided on at least one of the peripheral edge of the door made of material, the peripheral edge of the main body of the heating chamber, and the peripheral edge of the door that faces the main chamber A concave groove having a groove opening and a short-circuit portion, and a conductive material protruding from the end surface of the groove opening toward the inside of the groove so that the groove width of the groove opening is narrower than the groove width of the short-circuit portion. And a groove cover that covers the groove opening including the protrusion, and the conductor width is smaller than the pitch in the longitudinal direction of the groove on the protrusion and at least one of the wall surface groups. A plurality of slits are provided in the Is configured to be larger than the body width,
A radio wave sealing device in which a radio wave absorber is attached to the corner portion of the above configuration.
JP4422693A 1993-03-05 1993-03-05 Radio wave seal device Pending JPH06260279A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4422693A JPH06260279A (en) 1993-03-05 1993-03-05 Radio wave seal device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4422693A JPH06260279A (en) 1993-03-05 1993-03-05 Radio wave seal device

Publications (1)

Publication Number Publication Date
JPH06260279A true JPH06260279A (en) 1994-09-16

Family

ID=12685632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4422693A Pending JPH06260279A (en) 1993-03-05 1993-03-05 Radio wave seal device

Country Status (1)

Country Link
JP (1) JPH06260279A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003109745A (en) * 2001-09-28 2003-04-11 Matsushita Electric Ind Co Ltd High frequency heating device
JP2010255978A (en) * 2009-04-28 2010-11-11 Toshiba Corp Heating cooker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003109745A (en) * 2001-09-28 2003-04-11 Matsushita Electric Ind Co Ltd High frequency heating device
JP2010255978A (en) * 2009-04-28 2010-11-11 Toshiba Corp Heating cooker

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