JPS6047715B2 - High frequency heating device - Google Patents

High frequency heating device

Info

Publication number
JPS6047715B2
JPS6047715B2 JP11799280A JP11799280A JPS6047715B2 JP S6047715 B2 JPS6047715 B2 JP S6047715B2 JP 11799280 A JP11799280 A JP 11799280A JP 11799280 A JP11799280 A JP 11799280A JP S6047715 B2 JPS6047715 B2 JP S6047715B2
Authority
JP
Japan
Prior art keywords
radio wave
heating device
dielectric resonator
frequency heating
high frequency
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.)
Expired
Application number
JP11799280A
Other languages
Japanese (ja)
Other versions
JPS5743387A (en
Inventor
茂 駒井
美夫 安岡
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP11799280A priority Critical patent/JPS6047715B2/en
Publication of JPS5743387A publication Critical patent/JPS5743387A/en
Publication of JPS6047715B2 publication Critical patent/JPS6047715B2/en
Expired legal-status Critical Current

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  • Constitution Of High-Frequency Heating (AREA)

Description

【発明の詳細な説明】 本発明は高周波加熱装置に関し、特に加熱室開口周辺
の電波漏洩通路からの漏洩電波をTEモードの誘電体共
振器て効果的に抑止せんとするものてある。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating device, and more particularly, to a high-frequency heating device that effectively suppresses leakage radio waves from a radio wave leakage path around an opening of a heating chamber using a TE mode dielectric resonator.

従来、この種装置における漏洩電波の抑止は、漏洩電
波の波長をλとすると、λ/4長のチョーク溝を電波漏
洩通路に配した電波漏洩防止構造で行なつていたが、上
記チョーク溝はかなりの空洞容積を必要とし、従つて斯
る防止構造が大きくなるという欠点を有していた。
Conventionally, leakage radio waves in this type of device have been suppressed by a radio wave leakage prevention structure in which a choke groove with a length of λ/4 is arranged in the radio wave leakage path, where the wavelength of the leakage radio wave is λ. This has the disadvantage that it requires a considerable cavity volume and therefore the preventive structure becomes large.

そこでマイクロ波通信技術の分野では周知の誘電体共振
器を電波漏洩通路に配することて加熱室からの漏洩電波
を抑止することが提案されている。 斯る場合、電波漏
洩防止構造の寸法は誘電体共振器の寸法に左右されるが
、誘電体共振器の寸法は阻止せんとする電波の波長と共
振器の比誘電率Eγとて決まり、共振器の寸法を小さく
するには高い比誘電率のものを使用する必要がある。
Therefore, in the field of microwave communication technology, it has been proposed to suppress the leakage of radio waves from the heating chamber by disposing a well-known dielectric resonator in the radio wave leakage path. In such a case, the dimensions of the radio wave leakage prevention structure depend on the dimensions of the dielectric resonator, but the dimensions of the dielectric resonator are determined by the wavelength of the radio wave to be blocked and the relative dielectric constant Eγ of the resonator, and the resonance In order to reduce the size of the device, it is necessary to use a material with a high dielectric constant.

然るに比誘電率Eγが高くなるに従い一般的に共振器材
料の価格は上昇する。 従つて本発明は低価格てある低
誘電率の共振器を使用し、かつその寸法を小さくし得る
構造を提供せんとするものてあり、以下に一実施例を用
いて本発明を詳述する。
However, as the dielectric constant Eγ increases, the price of the resonator material generally increases. Therefore, the present invention aims to provide a structure that uses a low-cost resonator with a low permittivity and can reduce its dimensions.The present invention will be described in detail below using an example. .

第1図及び第2図は本発明の一実施例の要部を示し、
1は高周波加熱装置本体、2は該本体1内に配され、開
口3を有する加熱室、4は上記開口3の4周辺に配設さ
れた本体前面板、5は一端が上記前面板4の図示しない
一辺で枢支され、第1図中矢印方向に回動自在に上記開
口3を開閉するドアてあり、該ドア5は閉ドア時に上記
前面板4の4周辺に沿う枠状のドア枠体6と該ドア枠体
6の内縁に装着され、加熱室2内を透視てきるパンチン
グ板7とからなる。
FIGS. 1 and 2 show essential parts of an embodiment of the present invention,
1 is a main body of the high-frequency heating device; 2 is a heating chamber disposed within the main body 1 and has an opening 3; 4 is a front plate of the main body disposed around the opening 3; and 5 is one end of the front plate 4. There is a door which is pivoted on one side (not shown) and which opens and closes the opening 3 rotatably in the direction of the arrow in FIG. It consists of a body 6 and a punching plate 7 which is attached to the inner edge of the door frame 6 and allows the inside of the heating chamber 2 to be seen through.

上記ドア枠6は閉ドア時に裏面が上記前面板4と平行に
対向すると共に上記前面板4の4辺に沿う枠状の平坦部
Baと、該平坦部Ba外縁を前面板4側、つまり第2図
中Y方向に垂直に曲折してなる曲折部8bと、上記平坦
部Ba内縁を上記曲折部8bの曲折方向と同方向に傾斜
曲折してなる傾斜部8cとからなり、上記平坦部Ba)
曲折部8b及び傾斜部8cの少なくとも裏面Ba’、8
b’、8c’は金属面てある。また上記平坦部Ba)曲
折部8b及ひ傾斜部8cは上記ドア枠6、4辺に沿つた
周状溝9を形成している。10は閉ドア時に表面が前面
板4と近接対面すると共に上記周状溝9の一部を覆蓋す
べく内縁が上記傾斜部8c端の4辺に固着された枠状の
金属製電波通路壁てあり、漏洩電波の波長をλとした時
上記通路壁10と前面板4とにより形成される通路10
aの電波漏洩方向(第2図中Z方向)の長さは加熱室壁
2aからλ/4以上である。
The door frame 6 has a frame-shaped flat part Ba whose back surface faces the front plate 4 in parallel when the door is closed and which runs along the four sides of the front plate 4, and the outer edge of the flat part Ba is placed on the side of the front plate 4, that is, at the front plate 4 side. The flat part Ba is composed of a bent part 8b bent perpendicularly to the Y direction in FIG. )
At least the back surface Ba', 8 of the bent part 8b and the inclined part 8c
b' and 8c' have metal surfaces. Further, the flat portion Ba), the bent portion 8b, and the inclined portion 8c form a circumferential groove 9 along the four sides of the door frame 6. Reference numeral 10 denotes a frame-shaped metal radio wave passage wall whose surface closely faces the front plate 4 when the door is closed, and whose inner edges are fixed to the four sides of the end of the inclined portion 8c to cover a part of the circumferential groove 9. When the wavelength of the leaked radio wave is λ, the passage 10 formed by the passage wall 10 and the front plate 4
The length of a in the radio wave leakage direction (Z direction in FIG. 2) is λ/4 or more from the heating chamber wall 2a.

11は上記通路壁10で覆蓋されない上記周状溝9の残
りの部分を覆蓋すると共に閉ドア時に表面が上記前面板
4と近接対面するように上記曲接部8bの4辺と通路壁
10の外縁4辺との間に固着された枠状の低誘電体カバ
ー、12は直交する2面をメタライズされ、該メタライ
ズ面の一面を平坦部裏面8a″に、また他面を曲折部裏
面8b″に固着された直方体の旺モード誘電体共振器て
あり、該誘電体共振器12は周状溝9の各辺にて、その
辺方向(第2図中X方向)に一定間隔で配置されている
11 covers the remaining portion of the circumferential groove 9 that is not covered by the passage wall 10, and connects the four sides of the curved contact portion 8b and the passage wall 10 so that the surface thereof closely faces the front plate 4 when the door is closed. The frame-shaped low dielectric cover 12 fixed between the four sides of the outer edge is metallized on two orthogonal sides, one side of the metallized surface is the flat part back surface 8a'', and the other side is the bent part back surface 8b''. The dielectric resonators 12 are arranged on each side of the circumferential groove 9 at regular intervals in the direction of that side (the X direction in FIG. 2). There is.

第3図は高さ2A1幅B1長さぎのTEモード誘電体共
振器12のTEO,δモードての共振状態における電気
力線13及び磁力線14の分布を示す。
FIG. 3 shows the distribution of electric lines of force 13 and magnetic lines of force 14 in the TEO, δ mode resonance state of the TE mode dielectric resonator 12 having a height of 2 A 1 width B 1 length.

図から明らかな如く、共振モードにおける電気力線13
は誘電体共振器12内部の垂直面内で閉じたループを形
成し、従つてイメージ理論により誘電体共振器12の半
分の高さの水平面と半分の長さの垂直面とに夫々第1及
ひ第2の導体板15,16を挿入しても電気力線13は
第1及ひ第2の導体板15,16の夫々と垂直に交わる
からその分布に何ら影響がない。つまり、誘電体共振器
12の直交する2面を導体板に固着設置する場.合には
誘電体共振器12の高さは半分のA、長さも半分のCで
よいことになる。また、第3図中矢印方向から伝搬して
くる電波の磁界が共振モードにおける磁力線14の合成
方向に成分を有すれば漏洩電波は共振的に誘電体共振器
12と結合し、.その進行エネルギは大きく減衰する。
上記実施例の誘電体共振器12はチタン酸バリウムを主
成分とする比誘電率εγが90の誘電物質からなり、そ
の寸法は第2図中X方向の長さaが6wn..Y方向の
長さbが7.5=、Z方向の長さcが5.75順てある
As is clear from the figure, the lines of electric force 13 in the resonance mode
forms a closed loop within the vertical plane inside the dielectric resonator 12, and therefore, according to image theory, the first and second loops are formed in the horizontal plane of half the height and the vertical plane of half the length of the dielectric resonator 12, respectively. Even if the second conductor plates 15 and 16 are inserted, the lines of electric force 13 intersect perpendicularly to the first and second conductor plates 15 and 16, respectively, so that there is no effect on the distribution thereof. In other words, when two orthogonal surfaces of the dielectric resonator 12 are fixedly installed on a conductive plate. In this case, the height of the dielectric resonator 12 may be half A, and the length C may be half. Furthermore, if the magnetic field of the radio waves propagating from the direction of the arrow in FIG. 3 has a component in the direction in which the lines of magnetic force 14 are combined in the resonance mode, the leaked radio waves will be resonantly coupled to the dielectric resonator 12. Its traveling energy is greatly attenuated.
The dielectric resonator 12 of the above embodiment is made of a dielectric material whose main component is barium titanate and has a relative dielectric constant εγ of 90, and its dimensions are as follows: the length a in the X direction in FIG. 2 is 6wn. .. The length b in the Y direction is 7.5, and the length c in the Z direction is 5.75.

また上記第3図中の導体板15,16に相当するものは
ドア枠6の平担部裏面8a″及び曲折部裏面8b″の金
属面てある。従つて本実施例の誘電体共振器12は旺。
1δモードで共振するものであり、第2図中Z方向から
の漏洩電波が同図中X方向の磁束を有すれば、該漏洩電
波は誘電体共振器と共振的に結合し、その進行エネルギ
は大きく減衰する。
Further, the conductor plates 15 and 16 in FIG. 3 are metal surfaces on the flat back surface 8a'' and the bent back surface 8b'' of the door frame 6. Therefore, the dielectric resonator 12 of this embodiment is suitable.
It resonates in the 1δ mode, and if the leakage radio wave from the Z direction in Figure 2 has magnetic flux in the X direction in the diagram, the leakage radio wave will be resonantly coupled with the dielectric resonator, and its traveling energy will be is greatly attenuated.

尚上記実施例では第2図に示す如き直方体の誘電体共振
器12を用いたが、第4図に示す如き曲面を有する誘電
体共振器17の直交する2面18,19の一面18を上
記曲折部裏面8b″に、他面19を上記平担部裏面8a
″に夫々ろう付しても効果は変わらない。一方加熱室2
内に発せられた高周波は加熱室2内の図示しないスタラ
フアン、ターンテーブル、被加熱物等により種々の定在
波モードで存在するが、上記高周波の波長をλとする時
、上記高周波が金属製の平行平板内を電波の進行方向に
λ/4以上進んだ時点のモードは平行平板モードだけと
なることが確かめられた。即ち、上記実施例における前
面板4と電波通路壁10とから構成される通路10aは
上記平行平板と同等の効果を示す。従つて加熱室2内で
は種々のモードて存在していた高周波も上記通路10a
通過後は一定の平行平板モードとなる。尚上記通路10
aの電波漏洩方向(第2図中Z方向)の長さは上記実施
例の図示していない高周波加熱装置から発振される高周
波の基本周波数が2450MHzてあるのて、その波長
の約114の3cmとした。更に本実施例ては誘電体共
振器12の配置間隔1を面間距離て30?、とし、開ド
ア時に本体前面板4とドア枠平坦部8aとの空隙Gを1
0.5T!Rlnとした。上記平行平板モードの漏洩電
波は周状溝9の辺方向つまり第2図中X方向に一致する
磁界を有することとなる。
In the above embodiment, a rectangular parallelepiped dielectric resonator 12 as shown in FIG. The other surface 19 is attached to the back surface 8b'' of the bent portion, and the other surface 19 is attached to the back surface 8a of the flat portion.
The effect remains the same even if brazing is applied to the heating chamber 2.
The high frequency waves emitted within the heating chamber 2 exist in various standing wave modes due to the starch fan, turntable, heated object, etc. (not shown) inside the heating chamber 2. When the wavelength of the high frequency waves is λ, It was confirmed that the only mode at the time when the radio wave travels more than λ/4 in the parallel plate in the direction of propagation is the parallel plate mode. That is, the passage 10a composed of the front plate 4 and the radio wave passage wall 10 in the above embodiment exhibits the same effect as the parallel flat plate described above. Therefore, the high frequency waves existing in various modes in the heating chamber 2 are also transferred to the passage 10a.
After passing, it becomes a constant parallel plate mode. In addition, the above passage 10
Since the fundamental frequency of the high frequency oscillated from the high frequency heating device (not shown) in the above embodiment is 2450 MHz, the length of a in the radio wave leakage direction (Z direction in FIG. 2) is approximately 114 times 3 cm of the wavelength. And so. Furthermore, in this embodiment, the arrangement interval 1 of the dielectric resonators 12 is 30? , and the gap G between the main body front plate 4 and the door frame flat part 8a when the door is opened is 1.
0.5T! It was set as Rln. The leakage radio wave in the parallel plate mode has a magnetic field that coincides with the side direction of the circumferential groove 9, that is, the X direction in FIG.

従つて上記漏洩電波は効果的に誘電体共振器12と共振
的に結合して大きく減衰する。以上の説明からも明らか
な如く、本発明の高周波加熱装置の電波漏洩防止構造で
は漏洩電波を上記構造内に配した誘電体共振器と効果的
に共振させることができるので、電波漏洩防止において
充分な効果が得られ、またその寸法も小さくなる。
Therefore, the leakage radio waves are effectively coupled resonantly with the dielectric resonator 12 and are greatly attenuated. As is clear from the above explanation, the radio wave leakage prevention structure of the high frequency heating device of the present invention can effectively cause leakage radio waves to resonate with the dielectric resonator arranged within the structure, so it is sufficient to prevent radio wave leakage. effect, and its size is also reduced.

尚上記実施例ては電波漏洩防止構造をドア側に配したが
、該構造を本体側に配しても効果は同じである。
In the above embodiment, the radio wave leakage prevention structure is placed on the door side, but the effect is the same even if the structure is placed on the main body side.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例の要部拡大断面図、第2図は
同実施例要部斜視図、第3図は誘電体共振器の共振状態
を示す斜視図、第4図は本発明の実施例における他の誘
電共振器を示す斜視図てある。 1・・・・・・高周波加熱装置本体、2・・・・・・加
熱室、12・・・・・・■モード誘電体共振器。
FIG. 1 is an enlarged cross-sectional view of the main part of an embodiment of the present invention, FIG. 2 is a perspective view of the main part of the same embodiment, FIG. 3 is a perspective view showing the resonance state of a dielectric resonator, and FIG. FIG. 7 is a perspective view showing another dielectric resonator in an embodiment of the invention. 1...High frequency heating device main body, 2...Heating chamber, 12...■mode dielectric resonator.

Claims (1)

【特許請求の範囲】[Claims] 1 加熱室開口周辺の電波漏洩通路に漏洩電波と共振寸
法関係にある複数のTEモード誘電体共振器を配してな
る高周波加熱装置において、漏洩電波の波長をλとした
時上記電波漏洩通路の加熱室側の一端から少なくともλ
/4長だけ離れた上記電波漏洩通路内の金属面に上記誘
電体共振器の各々の直交する2面を固着したことを特徴
とする高周波加熱装置。
1. In a high-frequency heating device in which a plurality of TE mode dielectric resonators having a resonance dimension relationship with the leaked radio waves are arranged in the radio wave leakage path around the opening of the heating chamber, when the wavelength of the leaked radio waves is λ, the above radio wave leakage path is At least λ from one end on the heating chamber side
A high-frequency heating device characterized in that two orthogonal surfaces of each of the dielectric resonators are fixed to metal surfaces in the radio wave leakage path separated by a length of /4.
JP11799280A 1980-08-26 1980-08-26 High frequency heating device Expired JPS6047715B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11799280A JPS6047715B2 (en) 1980-08-26 1980-08-26 High frequency heating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11799280A JPS6047715B2 (en) 1980-08-26 1980-08-26 High frequency heating device

Publications (2)

Publication Number Publication Date
JPS5743387A JPS5743387A (en) 1982-03-11
JPS6047715B2 true JPS6047715B2 (en) 1985-10-23

Family

ID=14725342

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11799280A Expired JPS6047715B2 (en) 1980-08-26 1980-08-26 High frequency heating device

Country Status (1)

Country Link
JP (1) JPS6047715B2 (en)

Also Published As

Publication number Publication date
JPS5743387A (en) 1982-03-11

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