JP2953078B2 - Radio wave shielding device - Google Patents
Radio wave shielding deviceInfo
- Publication number
- JP2953078B2 JP2953078B2 JP3039985A JP3998591A JP2953078B2 JP 2953078 B2 JP2953078 B2 JP 2953078B2 JP 3039985 A JP3039985 A JP 3039985A JP 3998591 A JP3998591 A JP 3998591A JP 2953078 B2 JP2953078 B2 JP 2953078B2
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- wave shielding
- shielding material
- metal
- shielding device
- 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 - Fee Related
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
- H05B6/766—Microwave radiation screens for windows
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Electric Ovens (AREA)
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、電波強度の強い電子レ
ンジなどのドアに用いられる電波遮蔽装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave shielding device used for a door of a microwave oven having a high radio wave intensity.
【０００２】[0002]
【従来の技術】従来の電波遮蔽装置としては、電子レン
ジの庫内壁およびドアがある。電子レンジの庫内壁はス
テンレス等の金属板で構成された箱であり、金属面では
電波が反射される特性を利用して電波を遮蔽している。2. Description of the Related Art As a conventional radio wave shielding device, there are an inner wall and a door of a microwave oven. The inner wall of the microwave oven is a box made of a metal plate such as stainless steel, and the metal surface is shielded from radio waves by utilizing the characteristic of reflecting radio waves.
【０００３】一方、電子レンジの前面部にあるドアの内
部を透視する部分は、図６に示したように、電波（マイ
クロ波）空間に相当する庫内Ａ側より耐熱透視硝子１
０、直径１mm程度の孔が無数規則正しくあけられ、これ
らの３つの孔の中心を結ぶと正３角形を形成しかつ５０
％程度の開口率（単位面積当たりの透視可能な部分の面
積の割合）を有するパンチングメタル部１１、化粧透視
硝子１２を設けて構成されていた。なお、ドア本体は鉄
板のプレス成型品であり、その中央部にパンチングメタ
ル部１１が本体と一体となって設けられていた。また、
ドア本体の端部には電波漏洩防止機構が設けられている
が、本発明とは直接関係ないので省略している。On the other hand, as shown in FIG. 6, a portion of the front of the microwave oven that sees through the inside of the door is a heat-resistant transparent glass 1 from the inside A side corresponding to a radio wave (microwave) space.
0, holes of about 1 mm in diameter are innumerably regularly formed, and when connecting the centers of these three holes, a regular triangle is formed and 50 holes are formed.
The punching metal part 11 and the decorative see-through glass 12 having an aperture ratio of about% (the ratio of the area of the seeable portion per unit area) were provided. The door body was a press-formed product made of an iron plate, and a punching metal portion 11 was provided at the center portion thereof integrally with the body. Also,
A radio wave leakage prevention mechanism is provided at the end of the door body, but is omitted because it is not directly related to the present invention.
【０００４】前述した電子レンジの前面部にあるドアの
内部を透視する部分において、パンチングメタル部１１
が電波遮蔽装置であり、孔があけてあるのは庫内が見え
るようにするためである。この部分では、孔があいてい
るもののその孔径は電波から見ると無視できるものであ
り、庫内壁と同様、電波は遮蔽され庫外Ｂに伝搬しない
ようになっている。このように、従来の電波遮蔽装置で
は１種類の電磁遮蔽材例えば、パンチングメタル部で電
波を遮蔽するものであった。[0004] In a portion of the microwave oven which is to be seen through the inside of the front door, a punching metal portion 11 is provided.
Is a radio wave shielding device, and the perforations are made so that the inside of the refrigerator can be seen. In this part, although there is a hole, the hole diameter is negligible from the viewpoint of radio waves, and the radio wave is shielded so as not to propagate to the outside B as in the case of the inner wall of the refrigerator. As described above, in the conventional radio wave shielding device, radio waves are shielded by one type of electromagnetic shielding material, for example, a punching metal portion.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記の
ような構成では、パンチングメタル部１１の孔径が小さ
くかつ開口率が低いため電子レンジ庫内がよく見えず、
もっと庫内を見やすくしてほしいという要望があった。
これを満足するために、パンチングメタル部１１の開口
率を高くすることが考えられるが、開口率を高くすると
電波が漏洩するという課題が生ずる。However, in the above-described structure, the inside of the microwave oven cannot be clearly seen because the hole diameter of the punched metal portion 11 is small and the aperture ratio is low.
There was a request to make the inside of the warehouse easier to see.
In order to satisfy this, it is conceivable to increase the aperture ratio of the punching metal part 11, but when the aperture ratio is increased, there is a problem that radio waves leak.
【０００６】また、錫をドープした酸化インジウム（以
下ＩＴＯと記す）等の薄膜（導体層）を透明な基板の上
に蒸着により設けた透明導電体をパンチングメタル部の
代わりに用いる試みがあるが、透明性を確保した場合の
透明導電体の抵抗値は高く、これを電波強度の強い電子
レンジの電波遮蔽装置として用いると、電波照射時、表
面のＩＴＯ導体層に電位差の大きい部分が生じ、この部
分間でスパーク（火花放電）が発生し、その熱により導
体層が破損し実用に耐えないものになってしまうという
課題があった。There is also an attempt to use a transparent conductor in which a thin film (conductor layer) such as indium oxide doped with tin (hereinafter referred to as ITO) or the like is provided on a transparent substrate by vapor deposition instead of the punching metal portion. However, when the transparency of the transparent conductor is high, the resistance value of the transparent conductor is high, and when this is used as a radio wave shielding device of a microwave oven having a strong radio wave intensity, a portion having a large potential difference occurs on the surface of the ITO conductor layer during radio wave irradiation, There is a problem that a spark (spark discharge) is generated between these portions, and the heat damages the conductor layer, making the conductor layer unusable.
【０００７】本発明は、かかる従来の課題を解決し、電
子レンジのドアの内部を透視する部分などに用いられ電
波空間がよく見える電波遮蔽装置を提供することを目的
とする。An object of the present invention is to solve such a conventional problem and to provide a radio wave shielding device which is used in a portion of a microwave oven which allows the inside of a door to be seen through, so that a radio wave space can be clearly seen.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明の電波遮蔽装置は、可視光透過性および導電
性を有する材料で構成された少なくとも２種類の電波遮
蔽材の組合せよりなり、少なくとも５５％以上の可視光
透過率を有し、かつ電波が第１の前記電波遮蔽材を減衰
通過したのち第２の電波遮蔽材に至る構成とした。より
具体的には、第１の電波遮蔽材を、多数の開口部を有
し、その１個の開口部の面積が０.1〜４cm 2 でかつ開口
率が６０〜９５％の金属遮蔽体、第２の電波遮蔽材を表
面抵抗が０.0２〜５０ohm の透明導電体としたものであ
る。[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In addition, the radio wave shielding device of the present invention has a
At least two types of radio wave shields made of conductive materials
Composed of shielding material, visible light of at least 55% or more
Has a transmittance and the radio wave attenuates the first radio wave shielding material
After passing through, it was configured to reach the second radio wave shielding material. Than
Specifically, the first radio wave shielding material has a large number of openings.
And the area of one opening is 0.1 to 4 cm TwoAnd open
A metal shield with a rate of 60 to 95% and a second radio shielding material are shown.
A transparent conductor with a sheet resistance of 0.02 to 50 ohms
You.
【０００９】[0009]
【作用】本発明は、上記した構成により、電波を少なく
とも２種類の電波遮蔽材で分割して遮蔽できる。すなわ
ち、庫内の強い電界強度を有する電波は第１の電波遮蔽
材により大部分が反射され、残りの部分が吸収および透
過する。このとき、第１の電波遮蔽材は導電性を有する
ので部分間に大きな電位差ができないためスパークを発
生することはない。第１の電波遮蔽材を透過した電波は
その強度が弱められているため第２の電波遮蔽材により
完全に電波の透過を阻止することができる。According to the present invention, radio waves can be divided and shielded by at least two types of radio wave shielding materials by the above-described structure. That is, most of the radio waves having a strong electric field intensity in the refrigerator are reflected by the first radio wave shielding material, and the remaining portions are absorbed and transmitted. At this time, since the first radio wave shielding material has conductivity, a large potential difference cannot be generated between the portions, so that no spark is generated. Since the intensity of the radio wave transmitted through the first radio wave shielding material is weakened, the transmission of the radio wave can be completely prevented by the second radio wave shielding material.
【００１０】また、第２の電波遮蔽材においても第１の
電波遮蔽材により電波が弱められているので表面に大き
な電位差が発生しないためスパークが発生することはな
い。[0010] Also, in the second radio wave shielding material, since the radio wave is weakened by the first radio wave shielding material, no large potential difference is generated on the surface, so that no spark is generated.
【００１１】さらに、電波遮蔽材はいずれも可視光透過
性を有し全体として５５％以上の可視光透過率を有する
ので電波空間がよく見えるようになる。Further, since all the radio wave shielding materials have a visible light transmittance and a visible light transmittance of 55% or more as a whole, the radio wave space can be seen well.
【００１２】[0012]
【実施例】以下、本発明の電波遮蔽装置の一実施例を添
付図面にもとずいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the radio wave shielding device according to the present invention will be described below with reference to the accompanying drawings.
【００１３】本発明において可視光透過率を５５％以上
とした。これは従来のこの種の可視光透過率が５０％程
度であるので、それよりも電波空間がよくみえるように
定めた。In the present invention, the visible light transmittance is set to 55% or more. Since the visible light transmittance of this type of the related art is about 50%, the radio wave space is determined to be better than that.
【００１４】図１は電子レンジのドアの内部を透視する
部分に用いた電波遮蔽装置の断面図である。１は金属遮
蔽体であり、多数の開口部を有し、その開口部の面積が
１.0cm2 、開口率が８３％の、具体的には格子幅が１mm
で、格子孔（開口部）が一辺１０mm角を有する鉄製の金
属遮蔽板であり、ドア本体の中央部にプレス打ち抜きに
より作製した。２は、透明なポリエステルフィルムの表
面にＩＴＯ薄膜を蒸着で形成した透明導電体で表面抵抗
□２０オームである。そして、電波空間Ａに近い側より
金属遮蔽板１、透明導電体２を設けた。これらの端部は
ここでは導電性塗料を塗布して電気的に接続されてい
る。なお、図６の従来のものと同じものには同一符号を
付している。また、ドア周囲での電波漏洩防止装置は省
略している。FIG. 1 is a cross-sectional view of a radio wave shielding device used in a portion of the microwave oven that allows the inside of a door to be seen through. Reference numeral 1 denotes a metal shield having a large number of openings, the area of the openings is 1.0 cm 2 , the opening ratio is 83%, specifically, the lattice width is 1 mm.
In this case, a metal shielding plate made of iron and having a grid hole (opening) having a side of 10 mm square was prepared by press punching at the center of the door body. Reference numeral 2 denotes a transparent conductor formed by depositing an ITO thin film on the surface of a transparent polyester film, and has a surface resistance of □ 20 ohm. Then, the metal shielding plate 1 and the transparent conductor 2 were provided from the side closer to the radio wave space A. These ends are electrically connected here by applying a conductive paint. Note that the same components as those in FIG. 6 are denoted by the same reference numerals. Also, a device for preventing radio wave leakage around the door is omitted.
【００１５】上記構成において、電波（マイクロ波）は
先ず第１の電波遮蔽材である金属遮蔽板１に到達してそ
こで一部が反射または吸収して残りは通過する。このこ
とは、マイクロ波漏洩量測定より、金属遮蔽板１だけで
は約３０mW（ワット）／cm2 であり、これは金属遮蔽板
１が無い全くの開放状態では１００mW（ワット）／cm 2
以上であることより明らかである。そして、金属遮蔽板
１を通過して減衰したマイクロ波は第２の電波遮蔽材で
ある透明導電体２に至りそこで電波は完全に遮蔽された
（マイクロ波漏洩量０.1mW（ワット）／cm2 以下）。一
般にマイクロ波漏洩量は人体及び計測器等への影響を考
慮して１mW（ワット）／cm2 以下に規制されており、上
記実施例での値はこれを十分満足するものである。In the above configuration, radio waves (microwaves)
First, it reaches the metal shielding plate 1, which is the first radio wave shielding material, and
Here, a part is reflected or absorbed, and the rest passes. this child
Means that the metal shield plate 1 alone
Is about 30mW (Watt) / cmTwoThis is a metal shield
100 mW (Watt) / cm when fully open without 1 Two
It is clear from the above. And metal shielding plate
The microwave attenuated through 1 is the second radio wave shielding material
Radio wave was completely shielded at a certain transparent conductor 2
(Microwave leakage 0.1mW (watt) / cmTwoLess than). one
Generally, the amount of microwave leakage is considered to affect the human body and measuring instruments.
1mW (Watt) / cmTwoRegulated below and above
The values in the above examples sufficiently satisfy this.
【００１６】本発明の主眼とするところは、それぞれの
電波遮蔽材が実用に耐える（電界が集中してスパークし
異常に温度上昇を起こしたり、破損したりしないことを
指す）レベルまでマイクロ波の電界強度を調節または分
割してそれぞれの電波遮蔽材に導きそこでマイクロ波を
遮蔽することにある。上記実施例においては、先ず電気
抵抗が低く、高い電位差が生じスパークを行さない金属
遮蔽板１で電波を透明導電体２が破損しない電波強度以
下に減衰させ、減衰透過した電波を透明導電体２に導き
そこで電波を完全に遮蔽することができる。そして、金
属遮蔽板１の開口率と電波減衰率とは負の相関があると
ともに、金属遮蔽板１による電波減衰率が高いと透明導
電体２の抵抗値を高くできる。これは、ＩＴＯ薄膜の厚
みを薄くして透明性をあげることができるということで
ある。本実施例のものにマイクロ波照射を１０００時間
以上行っても透明導電体２に何等の変化も生じなかっ
た。こうして、可視光透過率７０％を有するドアにする
ことができた。また、従来の画一的な丸孔の開口部を有
する電子レンジドアの形を変えることができた。図２
は、図１の実施例を応用した電子レンジの斜視図、図３
は、図１の実施例の構成を示す斜視図である。The main feature of the present invention is that each radio wave shielding material can be used to a practical level (indicating that the electric field concentrates and sparks do not cause abnormal temperature rise or breakage). The purpose of the present invention is to adjust or divide the electric field strength and guide the electric field to each radio wave shielding material, where microwaves are shielded. In the above embodiment, first, the electric wave is attenuated by the metal shielding plate 1 having a low electric resistance and a high potential difference so as not to cause a spark, so that the electric wave is attenuated below the electric wave intensity at which the transparent conductor 2 is not damaged. The radio wave can be completely shielded there. The aperture ratio of the metal shield plate 1 and the radio wave attenuation factor have a negative correlation, and the higher the radio wave attenuation factor by the metal shield plate 1, the higher the resistance value of the transparent conductor 2 can be. This means that the thickness of the ITO thin film can be reduced to increase transparency. No change occurred in the transparent conductor 2 even when the microwave irradiation was performed for 1000 hours or more in the embodiment. Thus, a door having a visible light transmittance of 70% was obtained. In addition, the shape of the conventional microwave oven door having a uniform round hole opening could be changed. FIG.
FIG. 3 is a perspective view of a microwave oven to which the embodiment of FIG. 1 is applied;
FIG. 2 is a perspective view showing the configuration of the embodiment of FIG.
【００１７】なお、上記実施例においては、金属遮蔽体
を四角形の開口部を有する格子状の金属遮蔽板１とした
が、これに限定されるものでなく金網等を用いてもよい
し開口部の形状も種々のものを用いてもよい。図４に、
丸孔形状の開口部を有する導電性構成の実施例を示し
た。従来のドアと比べて内部が良く透視できる観点か
ら、実用的には開口部面積が０.1〜４cm2 でかつ開口率
が６０〜９５の金属遮蔽板と、表面抵抗が０.0２〜５０
ohm の透明導電体の組合せであれば良い。これは開口率
６０〜９５％に限定したのは、６０％以下では全体の可
視光透過率５５％を達成しにくいからであり、９５％以
上は理想的には好ましいが現実には得にくいからであ
る。また表面抵抗を０.0２〜５０ohm に限定０.0２ohm
以下では塗膜が厚くなりすぎ可視光透過率が低下するか
らであり、５０ohm 以上になると電波遮蔽能力が低下
し、実用に供しなくなるからである。開口部面積４cm2
で開口率９０％の金属遮蔽板と表面抵抗５ohm の透明導
電体との組合せにより５５％の可視光透過率を有するも
のにできる。さらに、金属遮蔽板のごとく材質が金属で
はなく、合成樹脂またはセラミックのシート上に導電性
材料を全体にあるいはその一部に一定のパターンで被覆
したものでも良い。さらに、前記実施例では透明導電体
を新たに設けたが、化粧透視硝子１２の表面に直接設け
ても良い。In the above embodiment, the metal shield is a grid-shaped metal shield plate 1 having a square opening, but the present invention is not limited to this, and a metal mesh or the like may be used. Various shapes may be used. In FIG.
An example of the conductive configuration having a round hole-shaped opening has been described. From the viewpoint that the inside can be seen through better than conventional doors, a metal shielding plate having an opening area of 0.1 to 4 cm 2 and an opening ratio of 60 to 95, and a surface resistance of 0.02 to 50 are practically used.
Any combination of ohm transparent conductors is acceptable. The reason why the aperture ratio is limited to 60 to 95% is that it is difficult to achieve an overall visible light transmittance of 55% if the aperture ratio is 60% or less, and it is ideally preferable if the aperture ratio is 95% or more, but it is actually difficult to obtain. It is. The surface resistance is limited to 0.02 to 50 ohms.
The reason for this is that the thickness of the coating film becomes too thick and the visible light transmittance is reduced, and if it exceeds 50 ohms, the radio wave shielding ability is reduced and the coating is not practically used. Opening area 4cm 2
With a combination of a metal shielding plate having an aperture ratio of 90% and a transparent conductor having a surface resistance of 5 ohms, a visible light transmittance of 55% can be obtained. Further, instead of using a metal material like a metal shielding plate, a conductive resin material may be entirely or partially coated on a sheet of a synthetic resin or ceramic in a predetermined pattern. Further, in the above embodiment, a transparent conductor is newly provided, but may be provided directly on the surface of the decorative fluoroscopic glass 12.
【００１８】図５は、本発明の第２の実施例を示すもの
で、９０％の開口率を有する２枚の金属遮蔽板を１／２
ピッチずらせて設けたもので、正面での可視光透過率は
実施例で示した金属遮蔽板１と同じにして、これと透明
導電体２を組み合わせたもので、第１の実施例と同様に
電波を遮蔽できる。このように２種類以上の電波遮蔽材
の組合せによっても目的を達成できる。FIG. 5 shows a second embodiment of the present invention, in which two metal shielding plates having an aperture ratio of 90% are reduced to 1/2.
Visible light transmittance at the front is the same as that of the metal shielding plate 1 shown in the embodiment, and is combined with the transparent conductor 2 as in the first embodiment. Can shield radio waves. Thus, the object can also be achieved by combining two or more types of radio wave shielding materials.
【００１９】[0019]
【発明の効果】以上のように、本発明の電波遮蔽装置に
よれば、次の効果が得られる。 （１）可視光透過性を有する材料よりなる電波遮蔽材よ
り構成され、５５％以上の可視光透過率を有しているの
で電波空間をよく見ることができる。 （２）少なくとも２種類の電波遮蔽材の組合せよりな
り、電波が第１の電波遮蔽材を減衰通過したのち第２の
電波遮蔽材に至る構成としているので、それぞれの電波
遮蔽材がもつ耐電界強度以下に電波の電界強度を調節お
よび分割できる。こうして、高い可視光透過率を維持し
たままで電波を遮蔽できる。As described above, according to the radio wave shielding device of the present invention, the following effects can be obtained. (1) It is made of a radio wave shielding material made of a material having visible light transmittance, and has a visible light transmittance of 55% or more, so that the radio wave space can be seen well. (2) It is composed of a combination of at least two types of radio wave shielding materials, and the electric wave attenuates and passes through the first radio wave shielding material before reaching the second radio wave shielding material. The electric field strength of the radio wave can be adjusted and divided below the strength. Thus, radio waves can be shielded while maintaining a high visible light transmittance.
【図１】本発明の電子レンジのドアに適用した電波遮蔽
装置の断面図FIG. 1 is a cross-sectional view of a radio wave shielding device applied to a door of a microwave oven according to the present invention.
【図２】本発明の電波遮蔽装置を用いた電子レンジの斜
視図FIG. 2 is a perspective view of a microwave oven using the radio wave shielding device of the present invention.
【図３】本発明の電子レンジのドアに適用した電波遮蔽
装置の斜視図FIG. 3 is a perspective view of a radio wave shielding device applied to a microwave oven door according to the present invention.
【図４】本発明の金属遮蔽体の他の実施例FIG. 4 shows another embodiment of the metal shield of the present invention.
【図５】本発明の電子レンジのドアに適用した他の実施
例の電波遮蔽装置の断面図FIG. 5 is a sectional view of a radio wave shielding device according to another embodiment applied to a door of a microwave oven according to the present invention.
【図６】従来の電子レンジドアの断面図FIG. 6 is a sectional view of a conventional microwave oven door.
１ 金属遮蔽体 ２ 透明導電体 1 Metal shield 2 Transparent conductor
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F24C 7/02 521 H05B 6/76 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) F24C 7/02 521 H05B 6/76
Claims (2)
開口部を有する金属からなる第１の電波遮蔽材と、前記
第１の電波遮蔽材の外側に設けた電気抵抗が比較的高い
透明導電体からなる第２の電波遮蔽とを備え、前記２種
類の電波遮蔽材の組合せにより、可視光透過率を５５％
以上とすると共に、前記第１の電波遮蔽材で電波を前記
第２の電波遮蔽材が破損しない電波強度以下に減衰させ
る構成とした電波遮蔽装置。 An electric resistance provided on a radio wave space side has a low electric resistance.
A first radio wave shielding material made of a metal having an opening,
The electric resistance provided outside the first radio wave shielding material is relatively high
A second radio wave shield made of a transparent conductor , and a visible light transmittance of 55% is obtained by combining the two types of radio wave shields.
In addition to the above, the first radio wave shielding material
Attenuate the radio wave intensity below the level where the second radio wave shielding material is not damaged.
Configuration and radio wave shielding device that.
し、その１個の開口部の面積が０.1〜４cm2 でかつ開口
率が６０〜９５％の金属遮蔽体、第２の電波遮蔽材を表
面抵抗が０.0２〜５０ohm の透明導電体とした請求項１
記載の電波遮蔽装置。2. A metal shield comprising: a first radio wave shielding material having a large number of openings, one of which has an area of 0.1 to 4 cm 2 and an aperture ratio of 60 to 95%; 2. The second radio wave shielding material is a transparent conductor having a surface resistance of 0.02 to 50 ohms.
The radio wave shielding device as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3039985A JP2953078B2 (en) | 1991-03-06 | 1991-03-06 | Radio wave shielding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3039985A JP2953078B2 (en) | 1991-03-06 | 1991-03-06 | Radio wave shielding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04278122A JPH04278122A (en) | 1992-10-02 |
| JP2953078B2 true JP2953078B2 (en) | 1999-09-27 |
Family
ID=12568237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3039985A Expired - Fee Related JP2953078B2 (en) | 1991-03-06 | 1991-03-06 | Radio wave shielding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2953078B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016144312A1 (en) * | 2015-03-09 | 2016-09-15 | Whirlpool Corporation | Microwave oven having door with transparent panel |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007026812A (en) * | 2005-07-14 | 2007-02-01 | Toyota Auto Body Co Ltd | Manufacturing method of gas flow passage forming material, gas flow passage forming material of metal separator for fuel cell, and through-hole forming device |
| JP2013036742A (en) * | 2011-08-03 | 2013-02-21 | Kobe Steel Ltd | Facility monitoring device |
| DE102021132627A1 (en) * | 2021-12-10 | 2023-06-15 | Schott Ag | Sheet-shaped glass article, door for a microwave oven comprising such a glass article and microwave oven |
-
1991
- 1991-03-06 JP JP3039985A patent/JP2953078B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016144312A1 (en) * | 2015-03-09 | 2016-09-15 | Whirlpool Corporation | Microwave oven having door with transparent panel |
| US10531524B2 (en) | 2015-03-09 | 2020-01-07 | Whirlpool Corporation | Microwave oven having door with transparent panel |
| US10779365B2 (en) | 2015-03-09 | 2020-09-15 | Whirlpool Corporation | Microwave oven having door with transparent panel |
| US11729872B2 (en) | 2015-03-09 | 2023-08-15 | Whirlpool Corporation | Microwave oven having door with transparent panel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04278122A (en) | 1992-10-02 |
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