JP2003046289A - Electromagnetic wave shielding device and electronic oven - Google Patents
Electromagnetic wave shielding device and electronic ovenInfo
- Publication number
- JP2003046289A JP2003046289A JP2001234531A JP2001234531A JP2003046289A JP 2003046289 A JP2003046289 A JP 2003046289A JP 2001234531 A JP2001234531 A JP 2001234531A JP 2001234531 A JP2001234531 A JP 2001234531A JP 2003046289 A JP2003046289 A JP 2003046289A
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic wave
- shielding device
- wave shielding
- conductor
- conductor piece
- 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.)
- Granted
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)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電磁波を遮蔽する
電磁波遮蔽装置に関するものであり、またその中でも特
に加熱室とドアの間から外部に伝搬しようとする電磁波
を遮蔽するために電磁波遮蔽装置を用いた電子レンジに
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding device for shielding an electromagnetic wave, and more particularly, to an electromagnetic wave shielding device for shielding an electromagnetic wave that propagates from the space between a heating chamber and a door to the outside. It relates to the microwave oven used.
【０００２】[0002]
【従来の技術】従来の第１の方法は、電子レンジ用の電
磁波遮蔽装置の最も基本的な考え方としてドアに減衰溝
を形成するλ／４インピーダンス反転方法が用いられ
る。図１１は電子レンジ全体の図、図１２は図１１の加
熱室１とドア２に関するＡ−Ａから見た断面図である。
電子レンジ内部の電磁波は加熱室１とドア２の隙間３を
通って図の右側から左側（ｚ方向）へと伝搬しようとす
るが、ドア２には導体４を折り曲げて構成した減衰溝５
を有し、減衰溝５の深さＬを使用周波数における波長λ
の１／４（＝約３０ｍｍ）にすることで減衰溝５の中を
みたインピーダンスＺｉｎを無限大にしてｚ方向への電
磁波を減衰させるというものである。これは例えば特開
昭５９−３７６９２号公報の従来の技術として記載され
ている。ただし電磁波はｚ方向を向いているとは限ら
ず、ｘ、ｙ、ｚの方向成分からなる合成ベクトルと考え
た時のｚ方向成分のみを減衰溝５で減衰させると考えて
よい。もしｚ成分を完全に０にできれば、ｘ成分やｙ成
分が大きくても小さくても関係無いが、ｚ成分を０にす
るのが難しい場合は注意を要する。隙間３は加熱室１本
体とドア２とでｘ―ｚ平面を形成することになり、ｙ成
分は隙間３のギャップＧが波長に対して極端に狭いので
無視できるが、ｘ成分については加熱室内の寸法がある
程度大きいので考慮しなければならない。ｚ成分がわず
かであっても、ｘ成分が大きくなり、合成ベクトルとし
ての漏洩量が大きくなる可能性があるためである。よっ
てｘ成分を減衰させるために以下の構成を用いることが
ある。図１３は図１２の減衰溝５をＢ方向から見た図で
あり、ｘ成分を減衰させるために幅ｓで深さＬのスリッ
ト６を切っている。このため、幅ａの切片７がピッチＰ
で配列された周期構造となり、ａ、Ｐ、ｓを適切に選定
することで遅波回路を構成でき、ｘ方向に対する電磁波
の伝搬を遮断することができる。さてこのｘ方向の構成
は減衰溝５の形状にはあまり影響しないので、結局、電
磁波遮蔽装置としての断面形状は図１２に示すＬ×ｂの
部分である。ｂは減衰溝５を形成する導体４間の距離で
あり、電界集中によるスパークなどの防止のため絶縁距
離として７〜１５ｍｍ程度（概ね１０ｍｍ）に選ぶこと
が多い。よって平均的には断面形状Ｌ×ｂ＝３０ｍｍ×
１０ｍｍ（即ち、λ／４×λ／１２）程度となる。2. Description of the Related Art The first conventional method uses a λ / 4 impedance reversal method of forming an attenuation groove in a door as the most basic idea of an electromagnetic wave shielding device for a microwave oven. 11 is a diagram of the entire microwave oven, and FIG. 12 is a cross-sectional view of the heating chamber 1 and the door 2 of FIG.
The electromagnetic wave inside the microwave oven tries to propagate from the right side to the left side (z direction) in the drawing through the gap 3 between the heating chamber 1 and the door 2, but the door 2 has the attenuation groove 5 formed by bending the conductor 4.
And the depth L of the attenuation groove 5 is set to the wavelength λ at the operating frequency.
Is set to 1/4 (= about 30 mm) to make the impedance Zin seen in the attenuation groove 5 infinite and attenuate the electromagnetic wave in the z direction. This is described as a conventional technique in, for example, Japanese Patent Laid-Open No. 59-37692. However, the electromagnetic wave is not always directed in the z direction, and it may be considered that only the z direction component is attenuated by the attenuation groove 5 when it is considered as a combined vector composed of x, y, and z direction components. If the z component can be completely set to 0, it does not matter whether the x component or the y component is large or small, but care must be taken when it is difficult to set the z component to 0. The gap 3 forms an xz plane between the main body of the heating chamber 1 and the door 2, and the y component can be ignored because the gap G of the gap 3 is extremely narrow with respect to the wavelength. Since the size of is somewhat large, it must be taken into consideration. This is because even if the z component is small, the x component may be large, and the amount of leakage as a combined vector may be large. Therefore, the following configuration may be used to attenuate the x component. FIG. 13 is a view of the attenuation groove 5 of FIG. 12 viewed from the direction B, in which a slit 6 having a width s and a depth L is cut in order to attenuate the x component. Therefore, the segment 7 having the width a has the pitch P.
The periodic structure is formed by arranging, and a slow wave circuit can be configured by appropriately selecting a, P, and s, and propagation of electromagnetic waves in the x direction can be blocked. Now, since the configuration in the x direction does not affect the shape of the attenuation groove 5 so much, the sectional shape of the electromagnetic wave shielding device is eventually the L × b portion shown in FIG. b is the distance between the conductors 4 forming the attenuation groove 5, and is often selected as an insulating distance of about 7 to 15 mm (generally 10 mm) in order to prevent sparks due to electric field concentration. Therefore, on average, the cross-sectional shape L × b = 30 mm ×
It is about 10 mm (that is, λ / 4 × λ / 12).
【０００３】次に従来の第２の方法は、前述の特開昭５
９−３７６９２号公報に発明として示されたもので、溝
の深さをλ／４よりも浅くする他の方法として、減衰溝
の開口部側の特性インピーダンスと短絡部側の特性イン
ピーダンスを異ならせる構成を示している。図１４は減
衰溝５の幅ｂ１、ｂ２を異ならせることで特性インピー
ダンスを変化させた構成である。減衰溝５の深さ方向の
ほぼ中央部で開口部８側と短絡部９側とを区分するもの
で、開口部８側の深さをＬ１、短絡部９側の深さをＬ２
とするとＬ１＋Ｌ２≒２０［ｍｍ］程度でλ／４よりも
浅くすることができる。またｂ１は従来の第１の方法と
同様に７〜１５ｍｍ程度（概ね１０ｍｍ）に選び、ｂ２
≒２×ｂ１と選ぶことが多い。よって平均的には断面形
状（Ｌ１＋Ｌ２）×ｂ２＝２０ｍｍ×２０ｍｍ（即ち、
λ／６×λ／６）程度となる。Next, the second conventional method is the above-mentioned Japanese Patent Laid-Open No.
The invention is disclosed in Japanese Patent Laid-Open No. 9-37692, and as another method of making the depth of the groove shallower than λ / 4, the characteristic impedance on the opening side and the characteristic impedance on the short-circuit side of the attenuation groove are made different. The configuration is shown. FIG. 14 shows a configuration in which the characteristic impedance is changed by making the widths b1 and b2 of the attenuation groove 5 different. The opening 8 side and the short-circuited portion 9 side are divided at approximately the central portion in the depth direction of the damping groove 5, and the depth on the opening 8 side is L1 and the depth on the short-circuited portion 9 side is L2.
Then, it is possible to make the depth shallower than λ / 4 when L1 + L2≈20 [mm]. Further, b1 is selected to be about 7 to 15 mm (generally 10 mm) as in the first conventional method, and b2 is selected.
In many cases, ≈2 × b1 is selected. Therefore, on average, the cross-sectional shape (L1 + L2) × b2 = 20 mm × 20 mm (that is,
It becomes about λ / 6 × λ / 6).
【０００４】その他に、より遮蔽性能が高い方法とし
て、図１５に示すように、二つの導体１０、１１で減衰
溝１２を形成し、加熱室側の導体１１にのみスリット１
３を入れる構成がある。図１５は、ＵＳＰ５，０３６，
１７１に示された構成で、Ｌ３をλ／４（≒３０ｍｍ）
に選んでいる。このような例は古くから有り、たとえば
特公昭５２−３０７３３号公報も同様のものと考えられ
る。これらの構成は、遮蔽性能は良いが導体が２つにな
り、両者の接続部分１４にスポットやかしめなどが必要
になるという作りにくさの問題がある。In addition, as a method having a higher shielding performance, as shown in FIG. 15, a damping groove 12 is formed by two conductors 10 and 11, and a slit 1 is formed only on the conductor 11 on the heating chamber side.
There is a configuration to put 3. FIG. 15 shows USP 5,036.
In the configuration shown in 171, L3 is λ / 4 (≈30 mm)
Have chosen. Such an example has existed for a long time, and it is considered that, for example, Japanese Patent Publication No. 52-30733 is also the same. Although these structures have good shielding performance, they have two conductors, and thus there is a problem in that they are difficult to make because spots and caulking are required at the connecting portions 14 between them.
【０００５】以上、電子レンジの電磁波遮蔽装置では、
加熱室とドアの隙間からの電磁波の漏洩を防ぐために減
衰溝を用いており、ドアの厚みが薄いことと作りやすい
ということから、現在では図１４（従来の第２の方法）
を用いたものが主流となっている。As described above, in the electromagnetic wave shielding device for the microwave oven,
Attenuation grooves are used to prevent the leakage of electromagnetic waves from the gap between the heating chamber and the door, and the thickness of the door is thin and it is easy to make. Therefore, it is currently shown in FIG. 14 (second conventional method).
The one using is the mainstream.
【０００６】さらに電子レンジ以外にも、最近ではマイ
クロ波の領域を通信に用いる場合が出てきている。特に
ブルートゥースやＩＥＥＥ８０２．１１ｂなどの規格は
電子レンジと同じ２４５０ＭＨｚを用いている。あるい
はマイクロ波の透過や反射を利用したセンサも開発され
ている。このような環境においては、互いに干渉したり
ノイズになる可能性があり、電磁波を遮蔽する技術が重
要になってくると考えられる。特に電子レンジは通信機
器と比べるとはるかに大きな電力（１ｋＷオーダー）を
扱うので、通信機器に影響を与えないためには、より高
性能な遮蔽性能が必要となるであろう。Further, in addition to a microwave oven, recently, a microwave region has been used for communication. Particularly, the standards such as Bluetooth and IEEE802.11b use 2450 MHz which is the same as the microwave oven. Alternatively, a sensor utilizing transmission or reflection of microwave has been developed. In such an environment, there is a possibility that they may interfere with each other or become noise, and it is considered that a technique for shielding electromagnetic waves becomes important. In particular, a microwave oven handles much larger electric power (1 kW order) than a communication device, so a higher-performance shielding performance will be required in order not to affect the communication device.
【０００７】[0007]
【発明が解決しようとする課題】前記従来の構成では、
たとえば電子レンジのドアの場合、減衰溝を有する構成
であり、電磁波の遮蔽性能を上げるためには図１５のよ
うな構成にするとか、あるいは減衰溝を多段に組み合わ
せるなどの方法が考えられる。しかしいずれの場合も導
体部分を１つだけで作るのは困難であり、２つ以上の導
体をスポットやかしめで一体化させなければならない。SUMMARY OF THE INVENTION In the above conventional configuration,
For example, a microwave oven door has a structure having an attenuation groove, and in order to improve the electromagnetic wave shielding performance, the structure shown in FIG. 15 or a combination of attenuation grooves in multiple stages can be considered. However, in either case, it is difficult to make only one conductor portion, and two or more conductors must be integrated by spotting or caulking.
【０００８】本発明は、前記従来の課題を解決するもの
で、従来以上の電磁波の遮蔽性能を達成し、かつ、１つ
の導体で構成できる作りやすい電磁波遮蔽装置および電
磁波遮蔽装置を用いた電子レンジを提供することを目的
とする。The present invention solves the above-mentioned conventional problems, and achieves electromagnetic wave shielding performance higher than conventional ones, and is easy to fabricate with a single conductor, and a microwave oven using the electromagnetic wave shielding device. The purpose is to provide.
【０００９】[0009]
【課題を解決するための手段】前記従来の課題を解決す
るために、本発明の電磁波遮蔽装置および電子レンジ
は、波長の１／４に満たない長さの導体片と、前記導体
片から分かれる導体壁面を有する構成としている。In order to solve the above-mentioned conventional problems, the electromagnetic wave shielding device and the microwave oven of the present invention are separated from a conductor piece having a length less than 1/4 of a wavelength and the conductor piece. It is configured to have a conductor wall surface.
【００１０】これによって、従来以上の電磁波の遮蔽性
能を達成し、かつ、１つの導体で構成できる作りやすい
電磁波遮蔽装置を実現することができる。As a result, it is possible to realize an electromagnetic wave shielding device which achieves an electromagnetic wave shielding performance higher than conventional ones and which can be easily constructed by one conductor.
【００１１】[0011]
【発明の実施の形態】請求項１に記載の発明の電磁波遮
蔽装置は、波長の１／４に満たない長さの導体片と、前
記導体片から分かれる導体壁面を有する構成としてい
る。これによって、従来以上の電磁波の遮蔽性能を達成
し、かつ、１つの導体で構成できる作りやすい電磁波遮
蔽装置を実現することができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The electromagnetic wave shielding device of the invention described in claim 1 is configured to have a conductor piece having a length less than 1/4 of a wavelength and a conductor wall surface separated from the conductor piece. As a result, it is possible to realize an electromagnetic wave shielding device that achieves electromagnetic wave shielding performance higher than that of the related art and that can be easily constructed by using one conductor.
【００１２】特に請求項２に記載の発明は、導体片と導
体壁面のいずれか一方を切り起こす構成なので、請求項
1の構成を容易に実現できる。In particular, the invention according to claim 2 has a configuration in which one of the conductor piece and the conductor wall surface is cut and raised.
The configuration of 1 can be easily realized.
【００１３】また、請求項３に記載の発明は、導体片に
より、導体壁面には抜き孔が形成される構成としてい
る。In the invention according to claim 3, the conductor piece has a structure in which a hole is formed in the wall surface of the conductor.
【００１４】また、請求項４に記載の発明は、抜き孔を
波長の１／４に満たない長さとしている。Further, according to the invention of claim 4, the hole has a length less than 1/4 of the wavelength.
【００１５】また、請求項５に記載の発明は、導体片の
長さと抜き孔の長さをそれぞれ波長の１／８程度として
いる。Further, in the invention according to claim 5, the length of the conductor piece and the length of the punched hole are each set to about 1/8 of the wavelength.
【００１６】また、請求項６に記載の発明は、抜き孔
は、長さ方向と直交する方向に幅５ｍｍ以上かつ１波長
以下としている。According to the sixth aspect of the invention, the hole has a width of 5 mm or more and one wavelength or less in the direction orthogonal to the length direction.
【００１７】また、請求項７に記載の発明は、複数の抜
き孔を有し、前記抜き孔間の距離を５ｍｍ以上１波長以
下としている。The invention according to claim 7 has a plurality of holes, and the distance between the holes is not less than 5 mm and not more than one wavelength.
【００１８】また、請求項８に記載の発明は、複数の抜
き孔を周期的に配置している。According to the invention of claim 8, a plurality of holes are periodically arranged.
【００１９】また、請求項９に記載の発明は、抜き孔の
配置の周期を５ｍｍ以上１波長以下としている。According to the ninth aspect of the invention, the period of arrangement of the holes is 5 mm or more and 1 wavelength or less.
【００２０】また請求項１０に記載の発明は、電磁波の
伝搬方向に平行な断面において、導体片を含む断面には
抜き孔が有り、前記導体片間の隙間を含む断面には抜き
孔が無い構成としている。In a tenth aspect of the present invention, in a cross section parallel to the electromagnetic wave propagation direction, a cross section including conductor pieces has a hole, and a cross section including a gap between the conductor pieces does not have a hole. It is configured.
【００２１】以上、請求項３ないし１０の発明は、いず
れも抜き孔の構成を限定するもので、請求項１、２の遮
蔽性能をより確実にすることができる。As described above, the inventions of claims 3 to 10 limit the structure of the vent hole, so that the shielding performance of claims 1 and 2 can be made more reliable.
【００２２】さらに請求項１１に記載の発明の電子レン
ジは、ドアの開閉により食品を出し入れできる加熱室
と、前記加熱室内に電磁波を供給して前記食品を加熱す
る電磁波供給手段と、前記加熱室と前記ドアとの少なく
とも一方に請求項１ないし１０のいずれか１項に記載の
電磁波遮蔽装置を有する構成としている。よって電子レ
ンジにおいても、従来以上の電磁波の遮蔽性能を達成し
つつ、電磁波遮蔽装置のある加熱室やドアを作りやすく
することができる。Further, the microwave oven of the invention according to claim 11 is a heating chamber in which food can be taken in and out by opening and closing a door, electromagnetic wave supplying means for supplying electromagnetic waves into the heating chamber to heat the food, and the heating chamber. And at least one of the door and the electromagnetic wave shielding device according to any one of claims 1 to 10. Therefore, also in a microwave oven, it is possible to easily make a heating chamber or a door having an electromagnetic wave shielding device while achieving electromagnetic wave shielding performance higher than conventional.
【００２３】[0023]
【実施例】以下本発明の実施例について、図面を参照し
ながら説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００２４】（実施例１）図１〜図７は、本発明の第１
の実施例における電磁波遮蔽装置および電子レンジにつ
いて説明するものである。(Embodiment 1) FIGS. 1 to 7 show a first embodiment of the present invention.
The electromagnetic wave shielding device and the microwave oven in the embodiment will be described.
【００２５】まず、図１から図４により構成について説
明する。電子レンジの概観は従来と同じ図８であるとす
る。図１は図８の加熱室１とドア２に関してＡ−Ａから
見た断面図、図２は主要部の斜視図、図３は図１とは別
の位置で切った断面図、図４は導体片に向かって見た構
成図である。First, the structure will be described with reference to FIGS. It is assumed that the microwave oven is as shown in FIG. 1 is a sectional view of the heating chamber 1 and the door 2 of FIG. 8 as seen from AA, FIG. 2 is a perspective view of a main portion, FIG. 3 is a sectional view taken at a position different from FIG. 1, and FIG. It is a block diagram seen toward the conductor piece.
【００２６】電子レンジは、ドア２の開閉により食品を
出し入れできる加熱室１と、加熱室１内に電磁波（本実
施例では２４５０ＭＨｚのマイクロ波。波長λは約１２
０ｍｍ）を供給して食品を加熱するための電源やマグネ
トロンや導波管からなる電磁波供給手段１５（図１１参
照）を有している。一方ドア２は、金属板からなるドア
本体１６の周囲には、ドア本体１６より切り起こした導
体片１７と、残りの導体壁面１８とを有し、導体壁面１
８には導体片１７を切り起こすために生じた抜き孔１９
が形成されている。The microwave oven includes a heating chamber 1 in which food can be taken in and out by opening and closing a door 2, and an electromagnetic wave (a microwave of 2450 MHz in this embodiment. The wavelength λ is about 12).
It has a power source for supplying 0 mm) to heat food and an electromagnetic wave supplying means 15 (see FIG. 11) including a magnetron and a waveguide. On the other hand, the door 2 has a conductor piece 17 cut and raised from the door body 16 and a remaining conductor wall surface 18 around the door body 16 made of a metal plate.
8 is a hole 19 formed to cut and raise the conductor piece 17.
Are formed.
【００２７】導体片１７については、マイクロ波の伝搬
方向（ｚ）である加熱室内から外部に向けて、まず導体
片１７と加熱室１側の対向面２０が平行な部分の距離ｂ
４≒８ｍｍ（≒λ／１５）、ついで対向面２０と垂直な
部分の距離Ｌ４≒８ｍｍ（≒λ／１５）とを合わせて、
導体片１７の長さは１６ｍｍ（≒λ／８）としている。
一方マイクロ波の伝搬と直交する方向（ｘ）に関して
は、導体片１７の幅ａ４≒１０ｍｍ（≒λ／１２）、導
体片間の隙間の距離ｓ４≒２０ｍｍ（≒λ／６）、より
周期Ｐ４≒３０ｍｍ（≒λ／４）としている。ちなみに
２１は誘電体からなるカバーであり、導体片１７間など
の隙間を覆うためのものである。カバー２１を配しても
対向面２０側に出っ張らないようにドア本体１６と導体
片１７の間に段２２を設けている。As for the conductor piece 17, the distance b between the conductor piece 17 and the facing surface 20 on the heating chamber 1 side is parallel to the outside from the heating chamber, which is the direction of microwave propagation (z).
4≈8 mm (≈λ / 15), and then the distance L4≈8 mm (≈λ / 15) of the portion perpendicular to the facing surface 20,
The length of the conductor piece 17 is set to 16 mm (≈λ / 8).
On the other hand, in the direction (x) orthogonal to the propagation of microwaves, the width a4 of the conductor piece 17 is approximately 10 mm (≈λ / 12), the distance s4 between the conductor pieces is approximately 20 mm (≈λ / 6), and the period P4 is ≈30 mm (≈λ / 4). By the way, reference numeral 21 is a cover made of a dielectric material for covering a gap such as between the conductor pieces 17. A step 22 is provided between the door body 16 and the conductor piece 17 so that even if the cover 21 is arranged, it does not project to the opposite surface 20 side.
【００２８】また抜き孔１９については、少なくとも導
体片１７以上の大きさにはなるが、本実施例ではできる
だけ導体片１７と同等の大きさになるようにした。図４
には導体片１７に向かって見た時の断面を示すが、抜き
孔１９の長さＬ５≒ｂ４＋Ｌ４≒１６ｍｍ（≒λ／
８）、幅ｃ５≒ａ４≒１０ｍｍ（≒λ／１２）、抜き孔
１９間の距離ｓ５≒ｓ４≒２０ｍｍ（≒λ／６）、周期
Ｐ５≒Ｐ４≒３０ｍｍ（≒λ／４）である。Further, the hole 19 is at least as large as the conductor piece 17 or larger, but in this embodiment, the hole 19 is made as large as the conductor piece 17 as much as possible. Figure 4
Shows a cross section when viewed toward the conductor piece 17, and the length of the punched hole 19 is L5≈b4 + L4≈16 mm (≈λ /
8), the width c5≈a4≈10 mm (≈λ / 12), the distance s5≈s4≈20 mm (≈λ / 6) between the holes 19, and the period P5≈P4≈30 mm (≈λ / 4).
【００２９】また導体壁面１８については、抜き孔１９
間の位置の先端に従来の電磁波遮蔽装置（図１４）の切
片２３を配置して減衰溝を形成している。また従来の構
成の図１５とは異なり抜き孔１９を有することで、導体
片１７や切片２３を含めて１枚の金属板のみで構成でき
るものである。Regarding the conductor wall surface 18, a hole 19 is formed.
The attenuation groove is formed by arranging the section 23 of the conventional electromagnetic wave shielding device (FIG. 14) at the tip of the position between them. Further, unlike the conventional configuration shown in FIG. 15, by providing the through hole 19, the conductor piece 17 and the segment 23 can be configured with only one metal plate.
【００３０】電磁波の伝搬方向ｚに平行な断面におい
て、導体片１７を含む断面（図１）は抜き孔１９を通る
が、導体片１７間の隙間にある切片２３を含む断面（図
３）は抜き孔１９を通らない。よって電磁波の伝搬方向
に垂直な方向（ｘ方向）に関して、切片２３による減衰
溝が周期的に存在していることはあきらかである。さら
に本実施例は、導体片１７の周期構造と切片２３による
減衰溝の周期構造が２重に存在して遮蔽効果を発揮する
構成とも考えられる。本実施例では、導体片１７と切片
２３による減衰溝とを合わせて、電磁波遮蔽装置２４を
構成している。In the section parallel to the propagation direction z of the electromagnetic wave, the section including the conductor piece 17 (FIG. 1) passes through the hole 19, but the section including the section 23 in the gap between the conductor pieces 17 (FIG. 3). Do not pass through the hole 19. Therefore, it is clear that the attenuation grooves due to the sections 23 are periodically present in the direction (x direction) perpendicular to the electromagnetic wave propagation direction. Further, in the present embodiment, it is considered that the periodic structure of the conductor piece 17 and the periodic structure of the attenuation groove due to the segment 23 are doubly present to exert the shielding effect. In this embodiment, the electromagnetic shield device 24 is configured by combining the conductor piece 17 and the attenuation groove formed by the piece 23.
【００３１】次に動作について説明する。電子レンジは
使用者が食品を出し入れしやすいようにするために、ド
ア２を簡単に開けられる構成としている。このため加熱
室１とドア２の対向面の間にはわずかながら隙間３があ
り、加熱室内の電磁波が外部に伝搬する可能性がある。
隙間３の形状は、ｙ方向には狭く、ｘ、ｚ方向には広い
ので、電磁波をｘ、ｙ、ｚ方向への合成ベクトルと考え
ると、ｘ方向成分とｚ方向成分が大きくなりｙ方向成分
は無視できる。よって外部への電磁波を遮蔽するために
は、ｚ方向成分とｘ方向成分を遮蔽しなければならな
い。ただしｚ方向成分を完全に０にできれば外部には伝
搬しないことになり、その場合はｘ方向成分を気にしな
くても良いと考えられる。Next, the operation will be described. The microwave oven has a structure in which the door 2 can be easily opened so that the user can easily take in and out food. Therefore, there is a slight gap 3 between the facing surfaces of the heating chamber 1 and the door 2, and electromagnetic waves in the heating chamber may propagate to the outside.
Since the shape of the gap 3 is narrow in the y direction and wide in the x and z directions, when the electromagnetic wave is considered to be a combined vector in the x, y, and z directions, the x direction component and the z direction component increase and the y direction component increases. Can be ignored. Therefore, in order to shield the electromagnetic waves to the outside, it is necessary to shield the z-direction component and the x-direction component. However, if the z-direction component can be completely set to 0, it will not propagate to the outside, and in that case, it is considered that the x-direction component need not be taken into consideration.
【００３２】本実施例では、ｚ方向成分に関しては、長
さｂ４＋Ｌ４の導体片１７と、切片２３による減衰溝と
により、２重に遮蔽している。またｘ方向成分に関して
も、幅ａ４の導体片１７をピッチＰ４で配列した周期構
造と、切片２３をピッチＰ４で配列した周期構造とによ
り、２重に遮蔽している。In this embodiment, the z-direction component is doubly shielded by the conductor piece 17 of length b4 + L4 and the attenuation groove formed by the segment 23. Regarding the x-direction component, double shielding is performed by the periodic structure in which the conductor pieces 17 having the width a4 are arranged at the pitch P4 and the periodic structure in which the segments 23 are arranged at the pitch P4.
【００３３】実際の遮蔽性能については、図５から図７
に示した試作品の断面構成図を用いながら、実験結果に
ついて記載する。ほぼ直方体の加熱室２５の開口面に対
向するようにＬ字状の遮蔽装置取付板２６、２６ａを配
置している。加熱室２５と遮蔽装置取付板２６、２６ａ
の間には厚み２ｍｍでコ字状のスペーサ２７を上面が開
口となる向きで介在させている。よってギャップＧ１は
２ｍｍとなる。また加熱室２５、遮蔽装置取付板２６、
２６ａ、スペーサ２７ともにステンレスで構成すること
で、加熱室２５から外部へ伝搬しようとする電磁波は図
５の矢印２８のように上向きにのみ伝搬する構成であ
る。ちなみに加熱室２５の上側の壁面と遮蔽装置取付板
２６が平行となる部位の距離ｋは、１０ｍｍ（≒λ／１
２）程度以下としている。さらに加熱室２５内に電磁波
を供給するのは天面からとしている。図５は電磁波遮蔽
装置が無い状態、図６は遮蔽装置取付板２６上に２９と
して図１１に示した従来の減衰溝を有する遮蔽構成を配
置したもの、図７は本実施例の電磁波遮蔽装置２４を配
置したものである。図７の場合には導体片と抜き孔を形
成する必要があるので、遮蔽装置取付板２６ａを２６と
は少し変更して一体化している。それぞれの場合に外部
に伝搬するマイクロ波を電力密度（ｍＷ／ｃｍ 2）とし
て測定して相対比較すると以下のようになる。図５では
１３、図６では２．５、図７では０．０１以下である。
即ち、本実施例の図７の構成は、図６の従来の構成より
も１／２５０以下の伝搬量しかない、即ち遮蔽性能が２
５０倍以上高いという効果がある。参考までに、図７で
切片２３を無くした場合の測定値は２．２であり、この
時点で従来よりも良いレベルであった。Regarding the actual shielding performance, FIG. 5 to FIG.
Using the cross-sectional configuration diagram of the prototype shown in
I will describe it. The opening surface of the heating chamber 25, which is a substantially rectangular parallelepiped,
Place the L-shaped shielding device mounting plates 26, 26a so that they face each other.
It is location. Heating chamber 25 and shielding device mounting plates 26, 26a
Between them, a U-shaped spacer 27 having a thickness of 2 mm is opened at the top.
It is placed so that it will be the mouth. Therefore, the gap G1 is
2 mm. In addition, the heating chamber 25, the shielding device mounting plate 26,
26a and spacer 27 must be made of stainless steel.
Then, the electromagnetic waves that try to propagate from the heating chamber 25 to the outside are
As shown by arrow 28 in FIG.
It By the way, the upper wall surface of the heating chamber 25 and the shielding device mounting plate
The distance k of the portion where 26 is parallel is 10 mm (≈λ / 1
2) Less than or equal to about. In addition, electromagnetic waves enter the heating chamber 25.
Is supplied from the top. Figure 5 shows electromagnetic shielding
With no device, FIG. 6 shows 29 on the shielding device mounting plate 26.
Then, the shielding structure having the conventional damping groove shown in FIG. 11 is arranged.
FIG. 7 shows the electromagnetic wave shielding device 24 of this embodiment.
It is placed. In the case of Fig. 7, the conductor piece and the hole are
Since it is necessary to form the shielding device mounting plate 26a,
Has been changed a little and integrated. External in each case
Of microwave propagating in the power density (mW / cm 2)age
It is as follows when measured and compared relative. In Figure 5
13, 2.5 in FIG. 6, and 0.01 or less in FIG.
That is, the configuration of FIG. 7 of this embodiment is different from the conventional configuration of FIG.
Also has a propagation amount of 1/250 or less, that is, the shielding performance is 2
The effect is 50 times higher. For reference, in Figure 7
The measured value without the intercept 23 is 2.2.
At that time, it was at a better level than before.
【００３４】以上、本実施例の電磁波遮蔽装置は、波長
の１／４に満たない長さ（具体的にはλ／８程度）の導
体片１７と、導体片１７から分かれる導体壁面１８を有
する構成としている。これによって、従来以上の電磁波
の遮蔽性能を達成しつつ、１つの導体で構成できる作り
やすい電磁波遮蔽装置を実現することができる。特に、
導体片１７と導体壁面１８のいずれか一方を切り起こす
構成の場合は極めて容易に実現できる。As described above, the electromagnetic wave shielding device of this embodiment has the conductor piece 17 having a length less than 1/4 of the wavelength (specifically about λ / 8) and the conductor wall surface 18 separated from the conductor piece 17. It is configured. As a result, it is possible to realize an electromagnetic wave shielding device that can be made up of a single conductor and that is easy to manufacture while achieving electromagnetic wave shielding performance that is higher than conventional ones. In particular,
In the case of a configuration in which one of the conductor piece 17 and the conductor wall surface 18 is cut and raised, this can be realized very easily.
【００３５】また、導体片１７により、導体壁面１８に
は抜き孔１９が形成される構成としており、特に抜き孔
の長さを波長の１／４に満たない長さ（具体的にはλ／
８程度）、長さ方向と直交する方向に幅５ｍｍ以上かつ
１波長以下（具体的にはλ／１２程度）、抜き孔間の距
離を５ｍｍ以上１波長以下（具体的にはλ／６程度）、
抜き孔の配置の周期を５ｍｍ以上１波長以下（具体的に
はλ／４程度）としている。見方を変えれば電磁波の伝
搬方向に平行な断面において、導体片１７を含む断面に
は抜き孔１９が有り、導体片１７間の隙間を含む断面に
は抜き孔１９が無い構成としている。A hole 19 is formed in the conductor wall surface 18 by the conductor piece 17, and the length of the hole is less than 1/4 of the wavelength (specifically, λ /
8 mm), the width is 5 mm or more and 1 wavelength or less (specifically about λ / 12) in the direction orthogonal to the length direction, and the distance between the holes is 5 mm or more and 1 wavelength or less (specifically about λ / 6). ),
The cycle of arrangement of the holes is 5 mm or more and 1 wavelength or less (specifically, about λ / 4). From a different point of view, in the cross section parallel to the propagation direction of the electromagnetic wave, the cross section including the conductor piece 17 has the hole 19, and the cross section including the gap between the conductor pieces 17 does not have the hole 19.
【００３６】以上により、従来以上の電磁波の遮蔽性能
を達成しつつ、１つの導体で構成できる作りやすい電磁
波遮蔽装置を実現することができる。As described above, it is possible to realize an electromagnetic wave shielding device which can be easily constructed by one conductor while achieving the electromagnetic wave shielding performance higher than the conventional one.
【００３７】さらに、特に電子レンジにおいて、加熱室
とドアとの対向面上でドア内部に電磁波遮蔽装置を有す
る構成としたので、ドアを作りやすくすることができ
る。なお、加熱室側に構成することも可能である。Further, particularly in the microwave oven, since the electromagnetic wave shielding device is provided inside the door on the facing surface between the heating chamber and the door, the door can be easily manufactured. In addition, it is also possible to configure on the heating chamber side.
【００３８】（実施例２）図８、図９は、本発明の第２
の実施例における電磁波遮蔽装置を示すものである。導
体片３０は抜き孔からの切り起こしではなく、導体壁面
３１と交互に存在している。導体片３０はフラットであ
り、導体壁面３１の方を折り曲げた構成である。本実施
例では導体壁面３１の先端３２が外向きに曲げられてい
るので、極めて加工しやすい効果がある。(Embodiment 2) FIGS. 8 and 9 show a second embodiment of the present invention.
2 shows an electromagnetic wave shielding device in the embodiment. The conductor pieces 30 are not cut and raised from the holes, but are alternately present with the conductor wall surfaces 31. The conductor piece 30 is flat, and the conductor wall surface 31 is bent. In this embodiment, since the tip 32 of the conductor wall surface 31 is bent outward, there is an effect that processing is extremely easy.
【００３９】（実施例３）図１０は、本発明の第３の実
施例における電磁波遮蔽装置を示すものである。本実施
例は、ドア本体１６よりも導体片３３および導体壁面３
４が対向面２０側に突出したような構成である。(Embodiment 3) FIG. 10 shows an electromagnetic wave shielding device according to a third embodiment of the present invention. In this embodiment, the conductor piece 33 and the conductor wall surface 3 are provided rather than the door body 16.
4 is projected toward the facing surface 20 side.
【００４０】なお、導体片や導体壁面に関しては、いま
だ原理的にも不明確なところがあり、形状の最適値がわ
かっているのではない。よって各実施例に示した以外に
も、導体片の幅が一定でなくて徐々に変えたり、向きが
ｚ方向にまっすぐではなくｘ方向に変位していたり、ピ
ッチが一定で無かったりというアレンジも可能と考えら
れる。Regarding the conductor piece and the conductor wall surface, there are still unclear points in principle, and the optimum value of the shape is not known. Therefore, in addition to the examples shown in the examples, there are arrangements in which the width of the conductor piece is not constant and gradually changes, the direction is not straight in the z direction but is displaced in the x direction, and the pitch is not constant. It seems possible.
【００４１】以上、本発明の実施例について説明してき
たが、上記各実施例の構成は互いに限定されることな
く、各々を組み合わせても良い。Although the embodiments of the present invention have been described above, the configurations of the above embodiments are not limited to each other and may be combined with each other.
【００４２】なお、上記実施例の電磁波遮蔽装置は、主
に電子レンジに応用した例として説明したが、これに限
られるものではない。電磁波を用いた通信機器（携帯電
話、無線ＬＡＮなど）や治療器や計測器や加熱機器やそ
の他の機器の筐体に用いることで外部への電磁波の伝搬
を遮蔽することができる。またこれらの機器とは関係の
無い機器であっても、電子部品を用いているもので、電
磁波による外来ノイズを防止したい場合のシールド装置
として使用することも考えられる。さらに他の電磁波遮
蔽装置としては、シールドルームなどの設備や建物、あ
るいは開口部とドアを有するもの全般への応用展開が考
えられる。Although the electromagnetic wave shielding device of the above-described embodiment has been described as an example mainly applied to a microwave oven, the invention is not limited to this. It is possible to block the propagation of electromagnetic waves to the outside by using it in the housing of communication devices (mobile phones, wireless LANs, etc.) that use electromagnetic waves, therapeutic devices, measuring instruments, heating devices, and other devices. In addition, even devices that are not related to these devices use electronic parts, and may be used as a shield device when external noise due to electromagnetic waves is desired to be prevented. Further, as another electromagnetic wave shielding device, it can be considered to be applied to equipment such as a shielded room, a building, or a device having an opening and a door in general.
【００４３】なお、導体片を金属板で構成した例のみ示
したが、基板上のパターンで構成したり、導電ゴム、導
電性ペイントなどで構成することも可能である。導電性
を有するものであれば応用可能と考えられる。Although only the example in which the conductor piece is made of a metal plate is shown, it may be made of a pattern on the substrate, conductive rubber, conductive paint, or the like. It is considered to be applicable as long as it has conductivity.
【００４４】[0044]
【発明の効果】以上のように、本発明によれば、従来以
上の電磁波の遮蔽性能を達成し、かつ、１つの導体で構
成できる作りやすい電磁波遮蔽装置を実現することがで
きる。よって電子レンジにおいても、従来以上の電磁波
の遮蔽性能を達成し、かつ、電磁波遮蔽装置のある加熱
室やドアを作りやすくすることができる。As described above, according to the present invention, it is possible to realize an electromagnetic wave shielding device which achieves an electromagnetic wave shielding performance higher than the conventional one and which can be easily constructed by one conductor. Therefore, even in a microwave oven, it is possible to achieve electromagnetic wave shielding performance higher than conventional and to easily make a heating chamber or a door having an electromagnetic wave shielding device.
【図１】本発明の実施例１における電磁波遮蔽装置と電
子レンジの断面構成図FIG. 1 is a cross-sectional configuration diagram of an electromagnetic wave shielding device and a microwave oven according to a first embodiment of the present invention.
【図２】同、電磁波遮蔽装置の斜視構成図FIG. 2 is a perspective configuration diagram of the same electromagnetic wave shielding device.
【図３】同、電磁波遮蔽装置と電子レンジの他の断面構
成図FIG. 3 is another sectional configuration diagram of the electromagnetic wave shielding device and the microwave oven.
【図４】同、電磁波遮蔽装置の導体片に向かって見た断
面構成図FIG. 4 is a sectional configuration view of the electromagnetic wave shielding device as viewed toward a conductor piece.
【図５】同、試作品の構成図[Fig. 5] Same as above
【図６】同、試作品に従来の電磁波遮蔽装置を取付けた
構成図[Fig. 6] Fig. 6 is a configuration diagram in which the conventional electromagnetic wave shielding device is attached to the prototype.
【図７】同、試作品に本実施例の電磁波遮蔽装置を取付
けた構成図[Fig. 7] Fig. 7 is a configuration diagram in which the electromagnetic wave shielding device of the present embodiment is attached to the prototype.
【図８】本発明の実施例２における電磁波遮蔽装置の斜
視構成図FIG. 8 is a perspective configuration diagram of an electromagnetic wave shielding device according to a second embodiment of the present invention.
【図９】同、電磁波遮蔽装置と電子レンジの断面構成図FIG. 9 is a sectional configuration diagram of the electromagnetic wave shielding device and the microwave oven.
【図１０】本発明の実施例３における電磁波遮蔽装置と
電子レンジの断面構成図FIG. 10 is a sectional configuration diagram of an electromagnetic wave shielding device and a microwave oven according to a third embodiment of the present invention.
【図１１】従来の電子レンジの構成図FIG. 11 is a block diagram of a conventional microwave oven.
【図１２】同、Ａ―Ａ線の断面構成図FIG. 12 is a sectional view taken along the line AA of FIG.
【図１３】同、Ｂからみた構成図FIG. 13 is a configuration diagram viewed from the same B.
【図１４】従来の他の電磁波遮蔽装置と電子レンジの断
面構成図FIG. 14 is a sectional configuration diagram of another conventional electromagnetic wave shielding device and a microwave oven.
【図１５】従来の他の電磁波遮蔽装置と電子レンジの断
面構成図FIG. 15 is a cross-sectional configuration diagram of another conventional electromagnetic wave shielding device and a microwave oven.
１、２５ 加熱室 ２ ドア １５ 電磁波供給手段 １７、３０、３３ 導体片 １８、３１、３４ 導体壁面 １９ 抜き孔 ２４ 電磁波遮蔽装置 1,25 heating chamber Two doors 15 Electromagnetic wave supply means 17, 30, 33 Conductor pieces 18, 31, 34 Conductor wall 19 Holes 24 Electromagnetic wave shielding device
フロントページの続き (72)発明者 信江 等隆 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 3K090 JB06 JB08 3L086 AA01 BC06 DA02 DA23 5E321 AA03 AA50 BB02 BB44 BB53 GG05 GH10 Continued front page (72) Inventor Toshitaka Nobue 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd. F-term (reference) 3K090 JB06 JB08 3L086 AA01 BC06 DA02 DA23 5E321 AA03 AA50 BB02 BB44 BB53 GG05 GH10
Claims (11)
と、前記導体片から分かれる導体壁面を有する電磁波遮
蔽装置。1. An electromagnetic wave shielding device having a conductor piece having a length of less than 1/4 of a wavelength and a conductor wall surface separated from the conductor piece.
起こす構成とした請求項１記載の電磁波遮蔽装置。2. The electromagnetic wave shielding device according to claim 1, wherein one of the conductor piece and the conductor wall surface is cut and raised.
成される構成とした請求項２記載の電磁波遮蔽装置。3. The electromagnetic wave shielding device according to claim 2, wherein the conductor piece has a structure in which a hole is formed in a wall surface of the conductor.
した請求項３記載の電磁波遮蔽装置。4. The electromagnetic wave shielding device according to claim 3, wherein the hole has a length that is less than 1/4 of the wavelength.
波長の１／８程度とした請求項４記載の電磁波遮蔽装
置。5. The electromagnetic wave shielding device according to claim 4, wherein the length of the conductor piece and the length of the hole are each set to about 1/8 of the wavelength.
５ｍｍ以上かつ１波長以下とした請求項３〜５のいずれ
か１項に記載の電磁波遮蔽装置。6. The electromagnetic wave shielding device according to claim 3, wherein the hole has a width of 5 mm or more and 1 wavelength or less in a direction orthogonal to the length direction.
離を５ｍｍ以上１波長以下とした請求項３〜６のいずれ
か１項に記載の電磁波遮蔽装置。7. The electromagnetic wave shielding device according to claim 3, which has a plurality of holes, and the distance between the holes is 5 mm or more and 1 wavelength or less.
３〜７のいずれか１項に記載の電磁波遮蔽装置。8. The electromagnetic wave shielding device according to claim 3, wherein a plurality of holes are periodically arranged.
以下とした請求項８記載の電磁波遮蔽装置。9. The electromagnetic wave shielding device according to claim 8, wherein the period of arrangement of the holes is 5 mm or more and 1 wavelength or less.
て、導体片を含む断面には抜き孔が有り、前記導体片間
の隙間を含む断面には抜き孔が無い構成とした請求項３
記載の電磁波遮蔽装置。10. A cross section parallel to the propagation direction of the electromagnetic wave has a punched hole in a cross section including conductor pieces, and a cross section including a gap between the conductor pieces does not have a punched hole.
The electromagnetic wave shielding device described.
る加熱室と、前記加熱室内に電磁波を供給して前記食品
を加熱する電磁波供給手段と、前記加熱室と前記ドアと
の少なくとも一方に請求項１〜１０のいずれか１項に記
載の電磁波遮蔽装置を有する構成とした電子レンジ。11. A heating chamber in which food can be taken in and out by opening and closing a door, an electromagnetic wave supply means for supplying electromagnetic waves into the heating chamber to heat the food, and at least one of the heating chamber and the door. 10. A microwave oven having the electromagnetic wave shielding device according to any one of items 10 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001234531A JP4867101B2 (en) | 2001-08-02 | 2001-08-02 | Electromagnetic wave shielding device and microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001234531A JP4867101B2 (en) | 2001-08-02 | 2001-08-02 | Electromagnetic wave shielding device and microwave oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003046289A true JP2003046289A (en) | 2003-02-14 |
| JP4867101B2 JP4867101B2 (en) | 2012-02-01 |
Family
ID=19066127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001234531A Expired - Fee Related JP4867101B2 (en) | 2001-08-02 | 2001-08-02 | Electromagnetic wave shielding device and microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4867101B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017154713A1 (en) * | 2016-03-10 | 2017-09-14 | パナソニックＩｐマネジメント株式会社 | High frequency heating apparatus |
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| JPS5172853A (en) * | 1974-12-21 | 1976-06-24 | Kubota Ltd | |
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| JPS60165088A (en) * | 1984-02-08 | 1985-08-28 | 松下電器産業株式会社 | High frequency heater |
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| JPH05129077A (en) * | 1991-11-05 | 1993-05-25 | Matsushita Electric Ind Co Ltd | Radio wave sealing device |
| JPH05326138A (en) * | 1992-05-22 | 1993-12-10 | Matsushita Electric Ind Co Ltd | Wave sealing device |
| JPH0883680A (en) * | 1994-09-12 | 1996-03-26 | Sharp Corp | Radio wave shield device and manufacture thereof |
| JPH10241855A (en) * | 1997-02-28 | 1998-09-11 | Sharp Corp | Microwave oven door |
| JPH10247586A (en) * | 1997-03-05 | 1998-09-14 | Toshiba Corp | High frequency heating system |
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2001
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5172853A (en) * | 1974-12-21 | 1976-06-24 | Kubota Ltd | |
| JPS6070687A (en) * | 1983-09-26 | 1985-04-22 | 松下電器産業株式会社 | Radio wave sealing device |
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| JPH10241855A (en) * | 1997-02-28 | 1998-09-11 | Sharp Corp | Microwave oven door |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017154713A1 (en) * | 2016-03-10 | 2017-09-14 | パナソニックＩｐマネジメント株式会社 | High frequency heating apparatus |
| JPWO2017154713A1 (en) * | 2016-03-10 | 2019-01-10 | パナソニックＩｐマネジメント株式会社 | High frequency heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4867101B2 (en) | 2012-02-01 |
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