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JPS6372091A - Radio frequency heater - Google Patents

Radio frequency heater

Info

Publication number
JPS6372091A
JPS6372091A JP21536786A JP21536786A JPS6372091A JP S6372091 A JPS6372091 A JP S6372091A JP 21536786 A JP21536786 A JP 21536786A JP 21536786 A JP21536786 A JP 21536786A JP S6372091 A JPS6372091 A JP S6372091A
Authority
JP
Japan
Prior art keywords
wall surface
door
flange
heating chamber
radio wave
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
JP21536786A
Other languages
Japanese (ja)
Inventor
岩淵 康司
哲男 窪田
幸雄 田中
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.)
Hitachi Heating Appliances Co Ltd
Original Assignee
Hitachi Heating Appliances 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 Hitachi Heating Appliances Co Ltd filed Critical Hitachi Heating Appliances Co Ltd
Priority to JP21536786A priority Critical patent/JPS6372091A/en
Publication of JPS6372091A publication Critical patent/JPS6372091A/en
Pending legal-status Critical Current

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  • 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) [Abstract] 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 本発明は高周波加熱装置のドア構造の改良に関する。[Detailed description of the invention] Industrial applications The present invention relates to an improvement in the door structure of a high frequency heating device.

従来の技術 高周波加熱装置のドア周縁に特性インピーダンスの異な
る溝を深さ方向に設け、この溝の深さ方向の特性インピ
ーダンスを不連続にすることにより実質的深さが使用波
長の4分の1より小さくしても、溝の入口でのインピー
ダンスが最大となり。
Conventional technology Grooves with different characteristic impedances are provided in the depth direction on the periphery of the door of a high-frequency heating device, and by making the characteristic impedance of the grooves discontinuous in the depth direction, the effective depth can be reduced to one-fourth of the wavelength used. Even if it is made smaller, the impedance at the entrance of the groove is maximum.

チョーク溝と同様に漏洩電波を少なくすることができる
という提案が特開昭60−25190号公報にある。こ
の従来例では、溝の深さ方向に幅の異なる溝を設けたり
、溝の周壁の形状を深さ方向に変形するなどかなり形状
が複雑である。また特性インピーダンスの不連続部にお
ける反射防止を考慮する必要がある。
There is a proposal in Japanese Patent Laid-Open No. 60-25190 that it is possible to reduce leakage radio waves in the same way as choke grooves. In this conventional example, the shape is quite complicated, such as providing grooves with different widths in the depth direction of the groove and deforming the shape of the peripheral wall of the groove in the depth direction. It is also necessary to consider reflection prevention at discontinuities in characteristic impedance.

発明が解決しようとする問題点 溝の深さ方向に複雑な形状をした溝を設ける必要があり
、また、特性インピーダンスの不連続部における反射防
止に手間が掛かる点である。
Problems to be Solved by the Invention It is necessary to provide a groove having a complicated shape in the depth direction of the groove, and it takes time and effort to prevent reflection at discontinuous portions of characteristic impedance.

問題点を解決するための手段 本発明は、ドア周囲を取り囲む額縁状の電波減衰空胴の
最外周壁に当たる部分を複数の導体片とし、この導体片
の先端を電波減衰空胴の入口を狭めるよって張り出し、
この張り出し面をテーパ付の誘電体カバ二で覆い、電波
減衰空胴を構成するそれらの部分を一枚の金属板から成
形したものである。
Means for Solving the Problems The present invention uses a plurality of conductor pieces at the outermost peripheral wall of a frame-shaped radio wave attenuation cavity surrounding the door, and narrows the entrance of the radio wave attenuation cavity at the tips of these conductor pieces. Therefore, the overhang
This projecting surface is covered with a tapered dielectric cover 2, and those parts constituting the radio wave attenuation cavity are molded from a single metal plate.

作用 上記のように構成することにより、導体片により漏洩し
ようとする電波はTEM波として波減衰空胴に導かれる
。電波減衰空胴を容量とインダクタンスの並列共振回路
とみなした場合、誘電体カバーによって電波減衰空胴の
入口での容量成分が大きくなり、その分だけインダクタ
ンス成分が小さくてよい。すなわち電波減衰空胴の深さ
が自由空間波長の4分の1よりも小さい状態でチョーク
溝として作用する。
Operation With the above configuration, radio waves that are about to leak through the conductor piece are guided to the wave attenuation cavity as TEM waves. When the radio wave attenuation cavity is regarded as a parallel resonant circuit of capacitance and inductance, the dielectric cover increases the capacitance component at the entrance of the radio wave attenuation cavity, and the inductance component may be reduced accordingly. That is, the radio wave attenuation cavity acts as a choke groove when its depth is smaller than one-fourth of the free space wavelength.

実施例 本発明の一実施例による高周波加熱装置の構成および作
用を図面とともに説明する。第1図および第2図におい
て、1は加熱室で、2は加熱室)の開口部を取り囲む7
ランジで、3は外箱である。
Embodiment The structure and operation of a high-frequency heating device according to an embodiment of the present invention will be explained with reference to the drawings. 1 and 2, 1 is a heating chamber, and 2 is a 7 that surrounds the opening of the heating chamber.
In the lunge, 3 is the outer box.

4は加熱室1内を覗くためにドア5の中央部にできるだ
け広範囲に設けた小穴群である。6はこの小穴群4の周
囲を取り囲む段部で、この段部6は小穴群4の内面に接
着した透光性のドア内カバー15の端部が清掃の際など
にはがれるのを防ぐと共に、ドア5閉成時にフランジ2
と平面接触する封口面7の平面度を良くするものである
。8は封口面7の端部よりフランジ2に対して略直角に
折り曲げた第)の壁面である。9は第)の壁面8の端部
より7ランジ2に対して略平行に延長した第2の壁面で
ある。10は第2の壁面9の端部よりフランジ2に向か
って略直角に折り曲げた多数の導体片で、この導体片1
0の先端には加熱室1開口部側に向かって張り出した張
出面′11に設けている。小穴群42段部6.封ロ面7
.第)の壁面8.第2の壁面?、導体片10および張出
面11は1枚の金属板から一体成形している。第)の壁
面8.第2の壁面9.導体片10および張出面11によ
り電波減衰空胴12を形成する。この電波減衰空胴12
の入口をふさぐ不透明の誘電体カバー13から突き出し
た突起片14は張出面11に設けた貫通穴23を介して
導体片10に設けた取付穴18に引っ掛かるようになっ
ている。ドア5の外側を覆う透光性のドア外カバー16
から突き出した突起片17は導体片10の根元を互いに
連結する連結面20の端部に引っ掛かるようになってい
る。誘電体カバー16の最外周裏面には外方に向って薄
くなるテーパー24を設けて取り付けの際にドア外カバ
ー16の端部に乗り上げないようにしている。誘電体カ
バー13の電波減衰空胴12の入口に当たる裏側には、
電波減衰空胴12の内部に向かって突き出たインピーダ
ンス調整部25を設けている。また、導体片10に対向
して不透明シート19がドア外カバー16の内面に設け
られ、外部より導体片10の間隙が見えないようになっ
ている。
Reference numeral 4 designates a group of small holes provided in the center of the door 5 as wide as possible to allow viewing into the heating chamber 1. Reference numeral 6 denotes a stepped portion surrounding the small hole group 4, and this stepped portion 6 prevents the end portion of the translucent door inner cover 15 adhered to the inner surface of the small hole group 4 from peeling off during cleaning, etc. Flange 2 when door 5 is closed
This improves the flatness of the sealing surface 7 that makes plane contact with the sealing surface 7. Reference numeral 8 denotes a wall surface ( ) which is bent from the end of the sealing surface 7 at a substantially right angle to the flange 2 . Reference numeral 9 denotes a second wall surface extending substantially parallel to the 7 flange 2 from the end of the second wall surface 8. Numeral conductor pieces 10 are bent approximately at right angles from the end of the second wall surface 9 toward the flange 2;
A projecting surface '11 projecting toward the opening of the heating chamber 1 is provided at the tip of the heating chamber 1. Small hole group 42 steps 6. Seal surface 7
.. ) Wall surface 8. Second wall? , the conductor piece 10 and the projecting surface 11 are integrally molded from a single metal plate. ) Wall surface 8. Second wall9. The conductor piece 10 and the projecting surface 11 form a radio wave attenuation cavity 12 . This radio wave attenuation cavity 12
A projection piece 14 protruding from an opaque dielectric cover 13 that blocks the entrance of the conductor piece 10 is hooked into a mounting hole 18 formed in the conductor piece 10 via a through hole 23 formed in the projecting surface 11. Translucent door outer cover 16 that covers the outside of the door 5
The projection piece 17 protruding from the conductor piece 10 is adapted to be caught on the end of a connecting surface 20 that connects the bases of the conductor pieces 10 to each other. A taper 24 that becomes thinner toward the outside is provided on the back surface of the outermost periphery of the dielectric cover 16 to prevent it from riding on the edge of the door outer cover 16 during installation. On the back side of the dielectric cover 13 corresponding to the entrance of the radio wave attenuation cavity 12,
An impedance adjustment section 25 is provided that protrudes toward the inside of the radio wave attenuation cavity 12. Further, an opaque sheet 19 is provided on the inner surface of the door outer cover 16 so as to face the conductor piece 10, so that the gap between the conductor pieces 10 is not visible from the outside.

次に上記のように構成した実施例の作用効果を説明する
。加熱室1開口部を取り囲むフランジ2と封口面7との
平面接触部に向かう入射電波に対して第3図のような簡
易等価回路によって定性的に電波シール効果を説明する
。22はフランジ2と封口面7との平面接触部に対応す
る容量で、一種のバイパスコンデンサとして作用する。
Next, the effects of the embodiment configured as described above will be explained. The radio wave sealing effect will be qualitatively explained using a simple equivalent circuit as shown in FIG. 3 with respect to the incident radio waves directed toward the planar contact portion between the flange 2 surrounding the opening of the heating chamber 1 and the sealing surface 7. 22 is a capacitor corresponding to the planar contact portion between the flange 2 and the sealing surface 7, and acts as a type of bypass capacitor.

平面接触部は平行板線路と考えられ、この線路の容量は
平行板のギャップに比例するので容量21は上記平面接
触部のギャップが小さいほど犬さくなり、電波シール効
果が増す。第)の壁面8と導体片10とはTEM波を伝
搬する平行板線路を形成し、終端が第2の壁面9によっ
て短絡されたものとみなすことができる。この場合張出
面11が無ければ第5図のように電界が分布し、平行板
線路の長さt、すなわち電波減衰空胴12の深さは自由
空間波長λの約4分の1で並列共振を起こし、インピー
ダンスが最大となる。電波減衰空胴12の四壁の厚さは
実用上、自由空間波長λに比べて十分小さいので無視し
て説明している。簡易等価回路を示す第3図では容量と
インダクタンスを並列にした並列共振回路22として表
わせる。
The planar contact portion is considered to be a parallel plate line, and since the capacitance of this line is proportional to the gap between the parallel plates, the capacitance 21 becomes smaller as the gap of the planar contact portion is smaller, and the radio wave sealing effect increases. The second wall surface 8 and the conductor piece 10 form a parallel plate line for propagating TEM waves, and it can be considered that the terminal end is short-circuited by the second wall surface 9. In this case, if there is no overhanging surface 11, the electric field will be distributed as shown in FIG. occurs, and the impedance becomes maximum. In practice, the thickness of the four walls of the radio wave attenuation cavity 12 is sufficiently smaller than the free space wavelength λ, so it is ignored in the explanation. In FIG. 3, which shows a simple equivalent circuit, it can be expressed as a parallel resonant circuit 22 in which a capacitance and an inductance are connected in parallel.

本実施例のように、電波減衰空胴12の最外周壁に当た
る導体片10の先端を電波減衰空胴12の入口を狭める
ように折り曲げて張出面1)を形成した場合、第4図の
ような電界分布となる。この場合。
As in this embodiment, when the tip of the conductor piece 10 that is on the outermost peripheral wall of the radio wave attenuation cavity 12 is bent to narrow the entrance of the radio wave attenuation cavity 12 to form the projecting surface 1), as shown in FIG. This results in an electric field distribution. in this case.

張出面1)の端部と第)の壁面8との間の電気力線は第
5図に比べてはるかに密集し易い。これは第4図の電波
減衰空胴12人口における容量成分が犬きくなシ、その
分だけインダクタンス成分を小さくしても、特定の周波
数に共振させることができることを意味する。すなわち
電波減衰空胴12の深さtを自由空間波長λの4分の1
より小さくしてもインピーダンス最大が得られ漏洩電波
を小さく抑えることができる。
The lines of electric force between the end of the overhanging surface 1) and the wall surface 8) tend to be much more concentrated than in FIG. This means that even if the capacitance component in the radio wave attenuation cavity 12 shown in FIG. 4 is small, even if the inductance component is reduced by that much, resonance can be achieved at a specific frequency. In other words, the depth t of the radio wave attenuation cavity 12 is set to one quarter of the free space wavelength λ.
Even if it is made smaller, maximum impedance can be obtained and leakage radio waves can be suppressed.

なお、インピーダンス調整部25は電波減衰空胴にの入
口における容量成分をさらに増す効果があり、電波減衰
空胴12の深さtを一層小さくするものである。
Note that the impedance adjustment section 25 has the effect of further increasing the capacitance component at the entrance to the radio wave attenuation cavity, and further reduces the depth t of the radio wave attenuation cavity 12.

発明の効果 以上のように本発明によると、特性インピーダンスの異
なる複数の平行板線路(溝)を設けなくても、電波減衰
空胴の最外周壁に当る導体片の先端に張出面を設けるだ
けで、電波減衰空胴の深さを自由空間波長の4分の1よ
り小さくできるので。
Effects of the Invention As described above, according to the present invention, there is no need to provide a plurality of parallel plate lines (grooves) with different characteristic impedances, and only an overhanging surface is provided at the tip of the conductor piece that contacts the outermost peripheral wall of the radio wave attenuation cavity. Therefore, the depth of the radio wave attenuation cavity can be made smaller than one quarter of the free space wavelength.

ドアの薄形化が図れ、簡単な構造の高周波加熱装置を提
供できる。
The door can be made thinner, and a high-frequency heating device with a simple structure can be provided.

また、ドアを一枚の金属板から一体成形できる構成であ
り、かつ誘電体カバーの最外周裏面にテーパーを設ける
ことによりドア外カバーとの契合性をよくしているので
組立工数が低減でき、経済的波及効果も犬なるものがあ
る。
In addition, the door can be integrally molded from a single metal plate, and by providing a taper on the back surface of the outermost periphery of the dielectric cover, it improves the fit with the outer door cover, reducing the number of assembly steps. There are also economic ripple effects.

【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による高周波加熱装置のドア
5の金属部だけを示す要部斜視図、第2図は同ドア周囲
の電波シール部を示す要部断面図。 第3図は同ドア5の電波シール部の簡易等価回路図、第
4図は同電波シール部の電界分布図、第5図は同終端を
短絡した平行板線路の電界分布図である。 1・・・加熱室、     2・・・フランジ。 4・・・小穴群、     5・・・ドア。 6・・・段部、      7・・−封口面。 8・・・第)の壁面、   9・・・第2の壁面。 10・・・導体片、11・・・張出面。 13・・・誘電体カバー16・・・ドア外カバー24・
・・テーパー。
FIG. 1 is a perspective view of a main part showing only the metal part of a door 5 of a high-frequency heating device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part showing a radio wave seal part around the door. FIG. 3 is a simplified equivalent circuit diagram of the radio wave seal portion of the door 5, FIG. 4 is an electric field distribution diagram of the radio wave seal portion, and FIG. 5 is an electric field distribution diagram of the parallel plate line with its terminal ends short-circuited. 1...Heating chamber, 2...Flange. 4... Small hole group, 5... Door. 6...Stepped portion, 7...-Sealing surface. 8...The second wall surface, 9...The second wall surface. 10... Conductor piece, 11... Projection surface. 13...Dielectric cover 16...Door outer cover 24.
··taper.

Claims (1)

【特許請求の範囲】[Claims] 加熱室1開口部を開閉するドア(5)の周縁に位置し、
ドア(5)閉成時には加熱室(1)開口部のフランジ(
2)に平面接触する封口面(7)と、この封口面(7)
の端部より上記フランジ(2)に対して略直角の第1の
壁面(8)と、この第1の壁面(8)の端部よりフラン
ジ(2)に対して略平行に延長した第2の壁面(9)と
、この第2の壁面(9)の端部よりフランジ(2)に向
かって略直角の多数の導体片(10)と、この導体片(
10)の先端から加熱室(1)開口部側に向って張り出
した張出面(11)とを備え、かつ張出面(11)を覆
う誘電体カバー(13)を設け、このカバー(13)の
最外周裏面を外方に向かって薄くなるテーパー(24)
状とし、このテーパー(24)の先端でドア外カバー(
16)に契合し、小穴群(4)、段部(6)、封口面(
7)、第1の壁面(8)、第2の壁面(9)、導体片(
10)および張出面(11)を一枚の金属板から成形し
たことを特徴とする高周波加熱装置。
Located at the periphery of the door (5) that opens and closes the heating chamber 1 opening,
When the door (5) is closed, the heating chamber (1) opening flange (
2) and a sealing surface (7) that makes plane contact with the sealing surface (7).
a first wall surface (8) extending substantially perpendicularly to the flange (2) from the end thereof, and a second wall surface (8) extending substantially parallel to the flange (2) from the end of the first wall surface (8). a wall surface (9), a large number of conductor pieces (10) approximately perpendicular to the flange (2) from the end of this second wall surface (9), and this conductor piece (
A dielectric cover (13) is provided, which has a projecting surface (11) projecting from the tip of the heating chamber (10) toward the opening side of the heating chamber (1), and covers the projecting surface (11). Taper that becomes thinner outward on the back surface of the outermost periphery (24)
The tip of this taper (24) connects the door outer cover (
16), the small hole group (4), the stepped part (6), and the sealing surface (
7), first wall surface (8), second wall surface (9), conductor piece (
10) and an overhanging surface (11) are formed from a single metal plate.
JP21536786A 1986-09-12 1986-09-12 Radio frequency heater Pending JPS6372091A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21536786A JPS6372091A (en) 1986-09-12 1986-09-12 Radio frequency heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21536786A JPS6372091A (en) 1986-09-12 1986-09-12 Radio frequency heater

Publications (1)

Publication Number Publication Date
JPS6372091A true JPS6372091A (en) 1988-04-01

Family

ID=16671120

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21536786A Pending JPS6372091A (en) 1986-09-12 1986-09-12 Radio frequency heater

Country Status (1)

Country Link
JP (1) JPS6372091A (en)

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