JP2009203147A - Method for producing plate-shaped glass - Google Patents

Method for producing plate-shaped glass Download PDF

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JP2009203147A
JP2009203147A JP2008049881A JP2008049881A JP2009203147A JP 2009203147 A JP2009203147 A JP 2009203147A JP 2008049881 A JP2008049881 A JP 2008049881A JP 2008049881 A JP2008049881 A JP 2008049881A JP 2009203147 A JP2009203147 A JP 2009203147A
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glass
plate
box shape
box
manufacturing
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JP4579305B2 (en
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Rinya Karibe
林也 苅部
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Toyo Glass Co Ltd
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Toyo Glass Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To produce high quality plate-shaped glass without any crystals and without any bubbles even in the glass liable to be crystallized. <P>SOLUTION: The plate glass is produced through: a step where molten glass is cast into a slit-shaped box mold and molded in a state where the box mold is inclined; a step where the glass in the box mold is slowly cooled; and a step where the molded plate-shaped glass is discharged from the box mold. When the molten glass is cast into the slit-shaped box mold, since its contact area with the inner wall face of the box mold is large, it is rapidly cooled from both the sides, and is vitrified without being crystallized, thus the high quality plate-shaped glass with no crystals can be obtained. Further, the bubbles do not form since the box mold is inclined in the casting. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、光学ガラス、電子部品の原料ガラス等として使用される比較的小形の板状ガラスを製造する方法に関する。   The present invention relates to a method for producing a relatively small plate glass used as an optical glass, a raw material glass for an electronic component, and the like.

従来、光学ガラス、電子部品の原料ガラス等として使用される、付加価値の高い比較的小型の板状ガラスの製造は、例えば、下記特許文献に示されるように、樋状の型に流し込んだ溶融ガラスをローラやコンベアで引き出して成形する方法で行われていた。
特開昭６１−２１９２８号公報 特開平１０−２５１２０号公報 Conventionally, the manufacture of high-value-added, relatively small sheet glass used as optical glass, glass for electronic components, etc., for example, as shown in the following patent document, melted into a bowl-shaped mold It was carried out by a method of drawing glass with a roller or conveyor.
JP-A-61-21928 Japanese Patent Laid-Open No. 10-25120

上記従来の板状ガラスの製造方法は、結晶化しにくいガラスの製造は可能であるが、例えばＶ２Ｏ５系のガラスのように、結晶化しやすいガラスを製造することはできなかった。これらの方法では、溶融ガラスを結晶化を避けて急速に均一に冷却することができないため、ガラス中に結晶が混在してしまい、ガラスと結晶の熱収縮率の違いによりクラックが生じたり、非常に割れやすいものとなってしまうからである。本発明は、結晶化しやすいガラスであっても、結晶の混じらない、高品質の板状ガラスを製造できるようにすることを課題としてなされたものである。 The conventional method for producing a plate glass can produce a glass that is difficult to crystallize, but it has not been possible to produce a glass that is easily crystallized, such as V 2 O 5 glass. In these methods, the molten glass cannot be rapidly and uniformly cooled avoiding crystallization, so that crystals are mixed in the glass, resulting in cracks due to the difference in thermal shrinkage between the glass and the crystal. This is because it becomes easily broken. An object of the present invention is to make it possible to produce a high-quality plate-like glass that is not mixed with crystals even if the glass is easily crystallized.

〔請求項１〕
本発明は、所定間隔で対向する２枚の面板と、該面板の左右両側を閉塞する端板と、該面板の下部を閉塞する底板で囲まれた板状のキャビティーを有し、上部の少なくとも湯口位置が開口したスリット状箱型内に、その前記面板が傾斜するように前記箱型を傾けた状態で溶融ガラスをキャストして板状ガラスを成形するステップと、前記箱型内のガラスを徐冷するステップと、成形した板状ガラスを前記箱型から取り出すステップとを有することを特徴とする板状ガラスの製造方法である。 [Claim 1]
The present invention has a plate-like cavity surrounded by two face plates facing each other at a predetermined interval, an end plate that closes both the left and right sides of the face plate, and a bottom plate that closes the lower part of the face plate. Casting the molten glass in a state in which the box is tilted so that the face plate is inclined in the slit-shaped box having an opening at least at the gate position, and forming glass in the box And a step of slowly cooling the glass and a step of taking out the molded plate glass from the box shape.

溶融ガラスがスリット状箱型内にキャストされる（流し込まれる）と、溶融ガラスは両側の面板から急速に冷やされ、結晶化することなくガラス化し、結晶の混じらない高品質の板状ガラスを得ることができる。
また、箱型を傾けた状態で溶融ガラスをキャストすると、溶融ガラスが箱型内に流れ込むときの巻き込み泡の発生が抑制され、泡のない板状ガラスを高歩留まりで製造することができる。 When the molten glass is cast (cast) into a slit-like box mold, the molten glass is rapidly cooled from the face plates on both sides to vitrify without crystallization, and to obtain a high-quality plate glass without crystal mixing. be able to.
In addition, when the molten glass is cast in a state where the box shape is inclined, generation of entrained bubbles when the molten glass flows into the box shape is suppressed, and a plate-like glass having no bubbles can be manufactured with a high yield.

〔請求項２〕
また本発明は、請求項１の製造方法において、前記箱形を傾ける角度が水平面に対して１５°〜６０°である板状ガラスの製造方法である。 [Claim 2]
Moreover, this invention is a manufacturing method of Claim 1, The angle which inclines the said box shape is a manufacturing method of the sheet glass which is 15 degrees-60 degrees with respect to a horizontal surface.

箱形を傾ける角度が水平面に対して１５°未満であると、箱型内にキャストされた溶融ガラスが上側の面板に接する時間が遅れ、結晶化してしまうおそれがある。６０°を越えると、巻き込み泡を防ぐ効果が減少する。箱形を傾けるさらに好ましい角度は、水平面に対して２０〜４０°である。   If the angle at which the box is tilted is less than 15 ° with respect to the horizontal plane, the time during which the molten glass cast in the box is in contact with the upper face plate may be delayed and crystallize. If it exceeds 60 °, the effect of preventing entrainment bubbles decreases. A more preferable angle for inclining the box shape is 20 to 40 ° with respect to the horizontal plane.

〔請求項３〕
また本発明は、請求項１又は２の製造方法において、成形した板状ガラスを前記箱型から取り出すステップの後、取り出した板状ガラスの不要部分を切り落として整形するステップを有することを特徴とする板状ガラスの製造方法である。 [Claim 3]
Further, the present invention is characterized in that, in the manufacturing method according to claim 1 or 2, the method further comprises a step of cutting off and shaping an unnecessary portion of the extracted sheet glass after the step of extracting the formed sheet glass from the box. It is the manufacturing method of the sheet glass to do.

溶融ガラスをスリット状箱型にキャストした場合、溶融ガラスを注ぎ込む湯口付近は溶融ガラスの保有熱が継続して供給され温度が下がりにくいので、結晶が生じることがある。また、成形時の板状ガラスの上部が平らになりにくいので、湯口付近及び成形時の上部付近の不要部分を切り落として、所望の形状に成形することが望ましい。   When the molten glass is cast into a slit-like box shape, the vicinity of the pouring gate into which the molten glass is poured is continuously supplied with the heat held by the molten glass, so that the temperature is unlikely to decrease, and thus crystals may occur. Moreover, since the upper part of the sheet glass at the time of shaping | molding does not become flat easily, it is desirable to cut off the unnecessary part near the pouring gate and the upper part at the time of shaping | molding, and to shape | mold to a desired shape.

〔請求項４〕
また本発明は、請求項１〜３のいずれかの製造方法において、キャストするときの前記溶融ガラスの温度が、ガラスの最高の結晶化温度をＴｃ1とした場合、Ｔｃ1＋２５℃以上、Ｔｃ1＋５００℃以下であることを特徴とする板状ガラスの製造方法である。 [Claim 4]
Further, in the production method according to any one of claims 1 to 3, the present invention provides that the temperature of the molten glass when casting is Tc1 + 25 ° C. or higher and Tc1 + 500 ° C. or lower, where the maximum crystallization temperature of the glass is Tc1. It is a manufacturing method of the sheet glass characterized by being.

溶融ガラスの温度がＴｃ1＋２５℃に満たないと、作業中にガラスが結晶化してしまうおそれがあり、Ｔｃ1＋５００℃を越えると箱型内にキャストしても冷却が不十分となって、やはり結晶化してしまうおそれがある。したがって、溶融ガラスの温度はＴｃ＋２５℃以上、Ｔｃ1＋５００℃以下が好ましい。   If the temperature of the molten glass is less than Tc1 + 25 ° C, the glass may crystallize during the work. If it exceeds Tc1 + 500 ° C, the glass will crystallize due to insufficient cooling even when cast in a box. There is a risk that. Therefore, the temperature of the molten glass is preferably Tc + 25 ° C. or higher and Tc 1 + 500 ° C. or lower.

〔請求項５〕
また本発明は、請求項１〜４のいずれかの製造方法において、溶融ガラスをキャストするときの前記箱型の内面温度が、ガラスの転移点の温度Ｔｇ−１００℃以上、ガラスの最低の結晶化温度Ｔｃ2−２５℃以下であることを特徴とする板状ガラスの製造方法である。 [Claim 5]
Further, the present invention provides the method according to any one of claims 1 to 4, wherein the inner surface temperature of the box shape when casting the molten glass is a glass transition point temperature Tg-100 ° C or more, and the lowest crystal of the glass. It is a manufacturing method of the sheet glass characterized by the conversion temperature Tc2-25 ° C or lower.

箱型の温度（内面）がＴｇ−１００℃に満たないと、溶融ガラスが急速に冷えすぎて板状ガラス表面（箱型内面との接触面）が凸凹になったり、歪みで割れてしまうおそれもある。Ｔｃ2−２５℃を越えると、溶融ガラスが箱型内面に接触しても結晶化温度以下にならず、結晶化したガラスが混じってしまうおそれがある。   If the temperature (inner surface) of the box is less than Tg-100 ° C, the molten glass may be cooled too quickly, and the surface of the plate glass (contact surface with the inner surface of the box) may be uneven or cracked due to distortion. There is also. When Tc2-25 ° C is exceeded, even if the molten glass comes into contact with the inner surface of the box mold, it does not fall below the crystallization temperature, and the crystallized glass may be mixed.

〔請求項６〕
また本発明は、請求項１〜５のいずれかの製造方法において、溶融ガラスを前記箱形内にキャストする湯口位置が、前記箱型の長さ方向の端部であることを特徴とする板状ガラスの製造方法である。 [Claim 6]
In the manufacturing method according to any one of claims 1 to 5, the pouring gate position where the molten glass is cast into the box shape is an end portion in the length direction of the box shape. It is a manufacturing method of glassy glass.

湯口位置には結晶化したガラスが混じるおそれがあるので、湯口を箱型の長さ方向の端部（少なくともキャビティーの長さの１／４よりも端）とすることで、比較的大きな板状ガラスを効率よく整形することができる。なお、結晶化の問題が生じない場合には、湯口位置は端部に限定しなくともよい。   Since there is a possibility that crystallized glass may be mixed at the gate, a relatively large plate can be formed by making the gate into an end in the length direction of the box (at least beyond 1/4 of the length of the cavity). Glass can be shaped efficiently. Note that when no crystallization problem occurs, the gate position is not necessarily limited to the end.

本発明の板状ガラスの製造方法は、スリット状箱型を用いることで、ガラスと型内面との接触面積が大きくなり、非常に結晶化しやすいガラスであっても、結晶の混じらない高品質の板状ガラスを得ることができる。
また、箱型を傾けた状態で溶融ガラスをキャストすることで、キャスト時の巻き込み泡の発生を防ぎ、泡のない板状ガラスを歩留まり良く製造できる。 The method for producing a sheet glass of the present invention uses a slit-shaped box mold to increase the contact area between the glass and the inner surface of the mold, and even if the glass is very easy to crystallize, it does not mix crystals. A sheet glass can be obtained.
Moreover, by casting the molten glass with the box shape inclined, it is possible to prevent the generation of entrained bubbles at the time of casting, and to produce a plate-like glass having no bubbles with a high yield.

図１〜４に示す箱型１は金属（鋳鉄）製で、対向する面板２ａ、２ｂ、面板の左右両側を閉塞する端板３、３、及び面板の下部を閉塞する底板４で組み立てられ、ボルト１０及びナット１１で固定されている。面板２ａ、２ｂ、端板３、３、及び底板４で囲まれた空間が、細いスリット状（板状）のキャビティー５となっている。キャビティー５のスリット幅は、製造する板状ガラスの厚さに対応して定める。すなわち熱収縮が無視できる場合、スリット幅はガラスの厚さと同じとし、熱収縮を考慮した場合は、ガラスの厚さよりも熱収縮分だけ広くする。本実施例の場合、スリット幅は３ｍｍとした。
本実施例では、温度制御装置を有さない箱型を用いたが、ヒータ、空冷パイプなどの温度制御装置を取り付けた箱型を用いることも可能である。例えば、箱型を電気炉で加熱した後、キャスティングのため電気炉から取り出している時間が長いときなどはヒータで箱型内面を加熱することが望ましく、板状ガラスの板厚が厚く箱型の面板の板厚が薄い場合などはキャスティング時に箱型内面を冷却することが望ましい。箱型の温度制御は、箱型内面温度が好ましい範囲（例えば、Ｔｇ−１００℃以上、Ｔｃ2−２５℃以下）となるように行えばよい。
本実施例の場合、キャビティー５の上部は全体が開口となっているが、溶融ガラスをキャストする湯口部分を除いた部分は閉塞してもかまわない。 1-4 is made of metal (cast iron), and is assembled with opposing face plates 2a and 2b, end plates 3 and 3 for closing the left and right sides of the face plate, and a bottom plate 4 for closing the lower portion of the face plate, It is fixed with bolts 10 and nuts 11. A space surrounded by the face plates 2 a and 2 b, the end plates 3 and 3, and the bottom plate 4 is a thin slit-like (plate-like) cavity 5. The slit width of the cavity 5 is determined according to the thickness of the sheet glass to be manufactured. That is, when thermal shrinkage is negligible, the slit width is the same as the glass thickness, and when thermal shrinkage is taken into consideration, the slit width is made wider by the thermal shrinkage than the glass thickness. In this example, the slit width was 3 mm.
In this embodiment, a box shape without a temperature control device is used, but a box shape to which a temperature control device such as a heater or an air cooling pipe is attached can also be used. For example, it is desirable to heat the inner surface of the box mold with a heater when the box mold is heated in the electric furnace and then removed from the electric furnace for casting. When the thickness of the face plate is thin, it is desirable to cool the box-type inner surface during casting. The box-type temperature control may be performed so that the box-type inner surface temperature is within a preferable range (for example, Tg-100 ° C. or higher, Tc 2-25 ° C. or lower).
In the case of the present embodiment, the entire upper portion of the cavity 5 is an opening, but the portion other than the gate portion where the molten glass is cast may be closed.

図４に示すように、箱型１を傾斜台１２に載せ、傾いた状態にする。傾斜台１２はベース板１３と、これに立設された２枚の支持板１４を有し、箱型１は、各支持板１４に設けた３カ所の突起１５により、面板の角度が水平面に対してθ＝３０°となるように支持されている。このように、面板と傾斜台との接触面積をなるべく小さくし、面板からの熱の発散をなるべく均等にすることが望ましい。
このように、箱型１を水平面に対し３０°に傾斜させて溶融ガラスをキャストすると、箱型１を直立させた場合に較べて、巻き込み泡の発生数が１０〜３０％程度に低減する。 As shown in FIG. 4, the box mold 1 is placed on the tilting table 12 to be tilted. The tilting table 12 has a base plate 13 and two support plates 14 erected on the base plate 13, and the box type 1 has an angle of the face plate in a horizontal plane by three projections 15 provided on each support plate 14. On the other hand, it is supported so that θ = 30 °. In this way, it is desirable to make the contact area between the face plate and the tilting table as small as possible and to make the heat dissipation from the face plate as uniform as possible.
As described above, when the molten glass is cast while the box mold 1 is inclined at 30 ° with respect to the horizontal plane, the number of entrained bubbles is reduced to about 10 to 30% as compared with the case where the box mold 1 is erected.

傾斜台に載置した箱型１を電気炉内で３００℃に加熱した後、一旦電気炉から取り出し、１０００℃の溶融ガラスをキャビティー５に流し込んだ。ガラスは、最高の結晶化温度Ｔｃ1＝７１０℃、最低の結晶化温度Ｔｃ2＝３８７℃、転移点温度Ｔｇ＝３０９℃のＶ２Ｏ５−ＢａＯ−Ｆｅ２Ｏ３系ガラスを用いた。溶融ガラスの湯口６は、箱型１の長さ方向の端部に設けた。図５はガラスＧの流し込みが完了した箱型１の断面図（図４のＡ−Ａ断面）である。その後、箱型１を傾斜台に載置したまま電気炉内に戻し、５℃／分程度の温度勾配で徐冷し、ガラスがほぼ室温になったところでボルト１０、ナット１１を取り外し、面板２ａから面板２ｂ及び端板３、３を外して成形した板状ガラス７を取り出した。板状ガラス７は、湯口付近が結晶化しており（結晶化部分９）、成形時の上端部分が不規則に斜めになっているので、図６に示す切断線（鎖線）で不要部分を切り落として整形し、最終製品としての板状ガラス８（７０ｍｍ×３０ｍｍ×３ｍｍ）を得た。板状ガラス８は、表面が平滑で結晶が全く混在しておらず、クラック、泡などの欠点もなく、高品質のものであった。 The box mold 1 placed on the tilting table was heated to 300 ° C. in an electric furnace, then taken out from the electric furnace, and 1000 ° C. molten glass was poured into the cavity 5. As the glass, V 2 O 5 —BaO—Fe 2 O 3 glass having the highest crystallization temperature Tc 1 = 710 ° C., the lowest crystallization temperature Tc 2 = 387 ° C., and the transition temperature Tg = 309 ° C. was used. The molten glass gate 6 was provided at the end of the box 1 in the length direction. FIG. 5 is a cross-sectional view (cross section AA in FIG. 4) of the box mold 1 in which the glass G has been poured. After that, the box mold 1 is returned to the electric furnace while being placed on the tilting table, and is slowly cooled at a temperature gradient of about 5 ° C./min. When the glass is almost at room temperature, the bolt 10 and the nut 11 are removed, and the face plate 2a The plate-like glass 7 formed by removing the face plate 2b and the end plates 3 and 3 was taken out. The glass sheet 7 is crystallized in the vicinity of the gate (crystallized portion 9), and the upper end portion at the time of molding is irregularly inclined, so unnecessary portions are cut off by the cutting line (chain line) shown in FIG. Thus, a plate-like glass 8 (70 mm × 30 mm × 3 mm) as a final product was obtained. The plate-like glass 8 was of a high quality with a smooth surface and no crystals at all, no defects such as cracks and bubbles.

〔比較例〕
図７に示す浅い箱型２０に上記実施例と同じガラスを同じ条件で流し込み、その後徐冷して比較例のガラス板（７０ｍｍ×３０ｍｍ×３ｍｍ）を作成した。このガラス板は上面が結晶化し、端欠け、クラック、引け巣の欠点が発生し、製品化できるものではなかった。 [Comparative example]
The same glass as in the above example was poured into the shallow box mold 20 shown in FIG. 7 under the same conditions, and then slowly cooled to prepare a comparative glass plate (70 mm × 30 mm × 3 mm). This glass plate was crystallized on the upper surface, and had defects such as chipping, cracks and shrinkage nests, and could not be commercialized.

実施例で使用した箱型１の平面図である。It is a top view of the box type 1 used in the Example. 実施例で使用した箱型１の正面図である。It is a front view of the box type 1 used in the Example. 実施例で使用した箱型１の側面図である。It is a side view of the box type 1 used in the Example. 実施例で使用した箱型１の使用状態の断面図である。It is sectional drawing of the use condition of the box type 1 used in the Example. 溶融ガラスのキャストが完了した状態の箱型１の断面図（Ａ−Ａ断面）である。It is sectional drawing (AA cross section) of the box type 1 of the state which the casting of molten glass was completed. 成形後の板状ガラス７及び切り落とし整形後の板状ガラス８の平面図である。It is a top view of the plate-like glass 7 after shaping | molding, and the plate-like glass 8 after cut-off shaping. 比較例で使用した箱型２０の斜視図である。It is a perspective view of the box type 20 used by the comparative example.

符号の説明Explanation of symbols

１ 箱型
２ａ 面板
２ｂ 面板
３ 端板
４ 底板
５ キャビティー
６ 湯口
７ 板状ガラス
８ 板状ガラス
９ 結晶化部分
１０ ボルト
１１ ナット
１２ 傾斜台
１３ ベース板
１４ 支持板
１５ 突起
２０ 箱型 DESCRIPTION OF SYMBOLS 1 Box type 2a Face plate 2b Face plate 3 End plate 4 Bottom plate 5 Cavity 6 Spout 7 Plate glass 8 Plate glass 9 Crystallized part 10 Bolt 11 Nut 12 Inclined base 13 Base plate 14 Support plate 15 Protrusion 20 Box shape

Claims (6)

所定間隔で対向する２枚の面板と、該面板の左右両側を閉塞する端板と、該面板の下部を閉塞する底板で囲まれた板状のキャビティーを有し、上部の少なくとも湯口位置が開口したスリット状箱型内に、その前記面板が傾斜するように前記箱型を傾けた状態で溶融ガラスをキャストして板状ガラスを成形するステップと、前記箱型内のガラスを徐冷するステップと、成形した板状ガラスを前記箱型から取り出すステップとを有することを特徴とする板状ガラスの製造方法。   There are two face plates facing each other at a predetermined interval, an end plate that closes both the left and right sides of the face plate, and a plate-like cavity surrounded by a bottom plate that closes the lower part of the face plate. Casting molten glass with the box shape tilted so that the face plate is inclined in the opened slit-shaped box shape, and forming the sheet glass, and slowly cooling the glass in the box shape The manufacturing method of the plate glass characterized by including the step and the step which takes out the shape | molded plate glass from the said box shape. 請求項１の製造方法において、前記箱形を傾ける角度が水平面に対して１５°〜６０°である板状ガラスの製造方法。   The manufacturing method of Claim 1 WHEREIN: The manufacturing method of the plate glass whose angle which inclines the said box shape is 15 degrees-60 degrees with respect to a horizontal surface. 請求項１又は２の製造方法において、成形した板状ガラスを前記箱型から取り出すステップの後、取り出した板状ガラスの不要部分を切り落として整形するステップを有することを特徴とする板状ガラスの製造方法。   3. The manufacturing method according to claim 1 or 2, further comprising a step of cutting and shaping an unnecessary portion of the extracted plate glass after the step of taking out the formed plate glass from the box shape. Production method. 請求項１〜３のいずれかの製造方法において、キャストするときの前記溶融ガラスの温度が、ガラスの最高の結晶化温度をＴｃ1とした場合、Ｔｃ1＋２５℃以上、Ｔｃ1＋５００℃以下であることを特徴とする板状ガラスの製造方法。   4. The method according to claim 1, wherein the temperature of the molten glass when casting is Tc1 + 25 ° C. or higher and Tc1 + 500 ° C. or lower when Tc1 is the highest crystallization temperature of the glass. A method for producing sheet glass. 請求項１〜４のいずれかの製造方法において、溶融ガラスをキャストするときの前記箱型の内面温度が、ガラスの転移点の温度Ｔｇ−１００℃以上、ガラスの最低の結晶化温度Ｔｃ2−２５℃以下であることを特徴とする板状ガラスの製造方法。   5. The method according to claim 1, wherein the inner surface temperature of the box-type when the molten glass is cast is a glass transition temperature Tg-100 ° C. or higher, and the lowest crystallization temperature Tc2-25 of the glass. The manufacturing method of the sheet glass characterized by being below ° C. 請求項１〜５のいずれかの製造方法において、溶融ガラスを前記箱形内にキャストする湯口位置が、前記箱型の長さ方向の端部であることを特徴とする板状ガラスの製造方法。
6. The method for producing a sheet glass according to claim 1, wherein the pouring gate position where the molten glass is cast into the box shape is an end portion in the length direction of the box shape. .
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105753300A (en) * 2016-01-26 2016-07-13 广东欧珀移动通信有限公司 Cover plate glass preparation process
US9960485B2 (en) 2014-11-19 2018-05-01 Panasonic Intellectual Property Management Co., Ltd. Antenna device using EBG structure, wireless communication device, and radar device
US10122074B2 (en) 2014-11-19 2018-11-06 Panasonic Intellectual Property Management Co., Ltd. Antenna device using EBG structure, wireless communication device, and radar device

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JPH10259033A (en) * 1997-03-17 1998-09-29 Nippon Telegr & Teleph Corp <Ntt> Mold for producing preform for polarized wave holding type optical fiber, and production of preform for optical fiber using the same

Patent Citations (2)

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JPH08133768A (en) * 1994-10-31 1996-05-28 Yamamura Glass Co Ltd Production of glass molding and production of optical fiber
JPH10259033A (en) * 1997-03-17 1998-09-29 Nippon Telegr & Teleph Corp <Ntt> Mold for producing preform for polarized wave holding type optical fiber, and production of preform for optical fiber using the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9960485B2 (en) 2014-11-19 2018-05-01 Panasonic Intellectual Property Management Co., Ltd. Antenna device using EBG structure, wireless communication device, and radar device
US10122074B2 (en) 2014-11-19 2018-11-06 Panasonic Intellectual Property Management Co., Ltd. Antenna device using EBG structure, wireless communication device, and radar device
CN105753300A (en) * 2016-01-26 2016-07-13 广东欧珀移动通信有限公司 Cover plate glass preparation process
CN105753300B (en) * 2016-01-26 2017-11-21 广东欧珀移动通信有限公司 A kind of cover-plate glass preparation technology

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