JP3591076B2

JP3591076B2 - Method for manufacturing glass substrate with partition walls

Info

Publication number: JP3591076B2
Application number: JP22337695A
Authority: JP
Inventors: 景一郎今野; 晃大塚
Original assignee: Fujitsu Ltd
Current assignee: Fujitsu Ltd
Priority date: 1995-08-31
Filing date: 1995-08-31
Publication date: 2004-11-17
Anticipated expiration: 2015-08-31
Also published as: JPH0969335A

Description

【０００１】
【発明の属する技術分野】
本発明は、コンピュータのディスプレイ端末装置に組み込まれるプラズマディスプレイパネル（以下、ＰＤＰと略称）などの隔壁付きガラス基板の製造方法に関する。
【０００２】
近年、ＰＤＰはカラー化の開発によりテレビジョン表示が可能な薄型フルカラーディスプレイ装置として応用が広がり、とくにハイビジョン映像用の大型フラットディスプレイパネルとして注目されている。このような用途実現のために、ＰＤＰの高精細化や大画面化が必要であるとともに、ＰＤＰの低製造コスト化が強く要望されている。
【０００３】
【従来の技術】
図９の面放電型カラーＰＤＰの断面構造の要部斜視図に示すように、従来のＰＤＰにおいては、表面基板１１と背面基板１２との対面間隔０．１５ｍｍの放電空間（Ｎｅ，Ｘｅ等を混合した放電ガスが封止されている）を行方向に、単位表示要素（サブピクセル）毎に仕切る（区画する）ストライプ状の隔壁１３が背面基板１２に設けられている。
【０００４】
背面基板に隔壁を形成する場合、背面基板に低融点ガラスペーストを厚膜スクリーン印刷法（マスクパターンをパターニングしたメッシュ状スクリーンからガラスペーストをスキージによって押し出し基板に印刷する）により、隔壁となる厚膜を表示領域内に印刷し、乾燥、焼成、アニールなどの複雑な製造プロセスを繰り返して積層し、例えば幅０．１ｍｍ、高さが０．１５ｍｍ、ピッチが０．３ｍｍの隔壁を形成している。
【０００５】
このカラーＰＤＰにおいて、画面を構成するピクセルは行方向に並ぶ赤（Ｒ），緑（Ｇ），青（Ｂ）の３つのサブピクセルからなっている。
なお、図中の符号で、１４はアドレス電極、１５ａ，１５ｂ，１５ｃは赤（Ｒ），緑（Ｇ），青（Ｂ）の蛍光体層、１６ａ，１６ｂは２本が平行で対となったＸ，Ｙサステイン電極、１７は誘電体層、１８は保護層である。
【０００６】
【発明が解決しようとする課題】
しかしながら、このような上記方法によれば、背面基板の隔壁を厚膜スクリーン印刷の繰り返しによって積層形成しているため、印刷膜厚が不均一になるとか、隔壁の形状がくずれるとか、印刷マスクの精度の影響で隔壁のピッチが不均一になるなどの問題があった。
【０００７】
また、近年は基板に均一な膜厚の隔壁材料を印刷し、レジストパターンをマスクとしてサンドブラスト法などにより不要部分を除去して隔壁を形成する手法なども開発されているが、なお隔壁の形状やピッチを高精度に形成するのは難しく、再現性の低い点でも問題があった。
【０００８】
さらに、いずれの方法も低融点ガラスペーストを使用するため材料費が高く、また製造プロセスが複雑なため加工費も高くなるといった問題があった。
上記問題点に鑑み、放電空間を間仕切る隔壁の形状及びピッチを低製造コストで高精細度に形成できる隔壁付きガラス基板の製造方法を提供することを目的とする。
【０００９】
【課題を解決するための手段】
上記目的を達成するために、本発明の隔壁付きガラス基板の製造方法は、放電空間を間仕切る隔壁に対応した突起を有する金型で、加熱軟化されたガラス基板を加圧し、該ガラス基板の表面を所定形状の凹凸にプレス成形して前記隔壁を形成する方法を採用し、その際に前記金型の突起の側面を突起先端に向かって突起厚さが漸次薄くなるように形成するとともに、突起の両端面を端部に向かって突起高さが漸次低くなるように形成することによって、当該ガラス基板上に側面が隔壁頂部に向かって傾斜する斜面または曲面の隔壁を形成するとともに、隔壁両端部の隔壁間の溝底を斜面または曲面に形成するように構成する。
【００１０】
このように、加熱軟化した基板を金型で加圧し、基板表面の所定領域を凹凸にプレス成形して隔壁を１回の加圧で一体成形するため、隔壁の形状やピッチを低製造コストで均一にして高精細度に形成できる。また隔壁両端部における隔壁間の溝底を斜面または曲面に形成することにより、当該隔壁間の溝底にアドレス電極を形成する場合に当該アドレス電極を隔壁形成領域外の周辺部に段差なく導出することができるのでアドレス電極を断線なく形成できる。
【００１１】
【発明の実施の形態】
以下、図面に示した各実施例に基づいて本発明の要旨を説明する。
本発明による隔壁付きガラス基板の製造方法を図３に示す。例えば、幅Ａ０．１ｍｍ、高さＢが０．１５ｍｍ、ピッチＰが０．３ｍｍの隔壁３ａを背面基板３にプレス成形によって形成する場合において詳細に説明する。
【００１２】
図１は、本発明によるプレス成形の第１の実施例を示す側面図である。図示するように、金型１である金型平板１−１と定盤２との間に背面基板３を挟み加圧してプレス成形する。
【００１３】
金型平板１−１は、図２に示すように、背面基板を覆う大きさで加圧力に十分に耐える厚さの長方形の耐熱金属厚板で、背面基板の隔壁に対応する幅Ｗ０．２ｍｍ、高さＨ０．１５ｍｍ、ピッチＰが０．３ｍｍの突起１ａが所定領域に形成してある。（隔壁の長手方向両端部分に成形不完全部分ができるため、その分だけ表示領域より大きくしておく）
この金型平板１−１を図１のようにプレス装置の加圧ヘッド４ａに取り付け、金型平板１−１に内設された温度調節可能なシーズヒータ（図示略）で平板表面を均一に加熱し約８００℃に保持する。
【００１４】
背面基板３を載せる定盤２は、プレス装置のホルダ台４ｂ上に載置固定する。この定盤２は、加圧力に十分に耐える厚さの長方形の耐熱金属製で背面基板３を入れる凹部２ａを備え、凹部２ａの内面は平面度よく平滑に仕上げてある。定盤２の凹部２ａと金型平板１−１とは予め、相互の位置関係が正確にセットされている。
【００１５】
背面基板３に隔壁をプレス成形するには、別の加熱炉で予め、約７００℃に加熱軟化させたソーダライムガラス製の背面基板３を定盤２の凹部２ａ内に載せる。背面基板３の温度は、定盤２に内設された温度調節可能なシーズヒータ（図示略）で引き続き約７００℃に保持される。
【００１６】
加圧ヘッド４ａを降下して金型平板１−１で背面基板３を約１００Ｋｇ／ｍ^２の加圧力で約５分間加圧した後、金型平板１−１を上昇させ、背面基板３を変形しないように約６００℃まで徐冷した後、取り出す。
【００１７】
図３に示すように、プレス成形された背面基板３の表面には、所定領域に両端の成形不完全な部分を除いて幅０．１ｍｍ、高さが０．１５ｍｍでピッチ０．３ｍｍの隔壁３ａが形成されたＰＤＰ用隔壁付き背面基板が完成する。
【００１８】
なお、金型平板は、背面基板が加熱軟化状態でプレス成形され、成形後に冷却されて収縮するため、予め、収縮分だけ突起のトータルピッチを補正して製作しておく。
【００１９】
この製造方法によれば、金型平板を用いて１回のプレス成形によって背面基板に隔壁を一体形成するため、隔壁の形状（幅及び高さ）及びピッチがどの場所においても非常に均一で高精細度に形成できて単位表示要素の分離が完全にでき、余剰点灯や欠点のない安定な表示を行うことができる。また、背面基板自体で隔壁をプレス成形するため、新たな隔壁材料費や複雑な製造プロセスが不要となり、低製造コストで高品質のＰＤＰを製造できる。
【００２０】
なお、従来、隔壁形成前に形成していたアドレス電極は、隔壁形成後でも隔壁間の溝に特に支障なく形成することができる。
さらにＰＤＰとして完成するため、図示はしないが、次工程において背面基板の隔壁間の溝底に例えば、アドレス電極を形成し、隔壁の側面及びアドレス電極の上にスクリーン印刷などによって蛍光体層を形成する。そうして、Ｘ，Ｙサステイン電極、誘電体層、保護層が形成された表面基板と、前記のアドレス電極と赤，緑，青の蛍光体層等とが形成された背面基板とをＸ，Ｙサステイン電極とアドレス電極とが直交するように対向配置し、両基板の周囲を気密封止した後、両基板間の空間を真空に排気してＮｅ＋Ｘｅ等の放電ガスを封入することによりＰＤＰを完成する。
【００２１】
このＰＤＰのＸ，Ｙサステイン電極及びアドレス電極に所定の電圧を印加すると、所定の放電空間で放電し、その放電によって発生した紫外線で蛍光体層が発光し、カラーの、映像や情報を表示することができる。
【００２２】
つぎの図４は、本発明によるプレス成形の第２の実施例を示す側面図である。図示するように、金型１である金型ローラ１−２と送りローラ５との間に背面基板３を挟み駆動回転させながら図示しない加圧手段により加圧してプレス成形する。
【００２３】
送りローラ５は、耐熱金属製の円筒体で表面平坦な円筒面を有して金型ローラ１−２と対をなして対向配設されており、図示しない駆動手段により回転駆動される。
【００２４】
金型ローラ１−２は、図５に示すように、耐熱金属製の円筒体で、円筒面の所定領域に背面基板の隔壁が円筒体の１回転で成形されるように幅０．２ｍｍ、高さ０．１５ｍｍでピッチ０．３ｍｍの突起１ａを備える。
【００２５】
送りローラ５の前後には、背面基板３を送り込み・搬出するために、図示しない駆動手段によって回転される複数の搬送ローラを並べたローラコンベア６を配設する。
【００２６】
背面基板の隔壁形成位置と金型ローラの突起との位置関係は、隔壁が背面基板の所定領域に形成されるように予め、セットされており、背面基板が一対の金型ローラ・送りローラの方に間欠的に供給されると、背面基板の送り込みと同期をとって送りローラが回転駆動される。
【００２７】
また、金型ローラ及び送りローラは共に内部に温度調節可能なシーズヒータ（図示略）を内設しており、ローラ表面を約８００℃の温度に加熱保持する。
背面基板に隔壁をプレス成形するには、別の加熱炉で予め、約７００℃に加熱したソーダガラスでなる背面基板を、金型ローラ・送りローラ間に約１０Ｋｇ／ｍの圧力、約１０ｃｍ／分の速度で加圧しながら通し、通過後、背面基板３が変形しないように約６００℃まで徐冷した後、再び搬送し取り出す。
【００２８】
背面基板には、第１の実施例の図３と同様に、幅０．１ｍｍ、高さが０．１５ｍｍでピッチ０．３ｍｍの隔壁が搬送方向にプレス成形され、基板表面の所定領域のどの場所においても均一かつ高精細度に形成される。さらにこの第２の実施例では、回転加圧しながら背面基板を熱間プレス成形できるため、背面基板を間欠的に搬送して隔壁を成形できる。
【００２９】
あるいは、図示はしないがその他の製造方法として、この第２の実施例の金型ローラを第１の実施例の金型平板の代わりに用い、金型ローラを定盤に対し平行に加圧しながら転がし、熱間プレス成形することにより隔壁を形成するように構成してもよい。
【００３０】
なお、上記第１，第２の実施例で用いる金型平板または金型ローラは、図６（ａ），（ｂ）に示すように突起１ａの側面を斜面〔図６（ａ）あるいは曲面〔図６（ｂ）にして抜き勾配を付け、さらに図７（ａ），（ｂ）の放電空間の形成に関与しない突起１ａの長手方向の両端面も斜面〔図７（ａ）あるいは曲面〔図７（ｂ）にして抜き勾配を付けるのが望ましく、それによって成形後の金型を抜き易くして隔壁のエッジの欠けを防止する。
【００３１】
また、それだけでなく、隔壁が形成された所定領域外の周辺部表面と隔壁間の溝の両端部の底面とは段差が生じるが、両端部の溝底が斜面あるいは曲面に形成されることにより、隔壁間の溝底に形成したアドレス電極を周辺部表面に段差なく導出するのに有効に作用する。
【００３２】
上記実施例の金型平板１−１（または金型ローラ１−２）の突起１ａの寸法は、図８に示すように、隔壁３ａが形成されない背面基板３の周辺部３ｂの表面を基準とし、突起１ａのこの基準面より先端の断面積Ｓ_１（左上がり斜線部分）とその反対側の突起１ａ間の溝１ａ−１の断面積Ｓ_２（右上がり斜線部分）とをほぼ等しくしている。
【００３３】
即ち、幅０．１ｍｍ、高さが０．１５ｍｍでピッチ０．３ｍｍの隔壁３ａを形成するのに、突起１ａを高さ０．１５ｍｍ、基準面からの高さ０．１ｍｍ、幅０．２ｍｍ、ピッチ０．３ｍｍにすると、周辺部の表面を通る基準線は突起１ａの高さを１：２に分割した位置となり、突起１ａの１／３が背面基板３に押し込まれてＳ_１とＳ_２とがほぼ等しくなる。なお、周辺部に隣接した隔壁（図８の最左端）の高さは片方からの盛り上がりがないため、約１／２の高さとなるが、放電空間の形成には関与しない。
【００３４】
このような条件で背面基板の隔壁を形成することにより、突起を形成する領域以外の周辺部は金型で加圧されないため、基板のプレス成形時の粘度をある程度高くできる。さらに、突起の長手方向両端部の放電空間を形成しない部分の高さを端部に向かって低くすることにより、周辺部に及ぼされる加圧による変形は殆どなく、ストレスの少ない成形ができる。したがって、プレス成形時の基板及び金型の温度を低下させることができ、徐冷時間を短縮して量産性の向上を図ることができる。
【００３５】
上記説明の何れの実施例も、１回のプレス工程により基板自体で隔壁を一体形成するため、従来のように複雑な製造プロセスで隔壁を形成する必要がなくなり製造プロセスが大幅に簡略化される。また、金型を用いることで再現性があって隔壁の寸法や品質が安定し、表示品質の向上と材料費及び加工費の大幅な削減が可能となる。
【００３６】
【発明の効果】
以上、詳述したように本発明によれば、カラーＰＤＰなどの放電空間を間仕切る隔壁を金型によるプレス成形で、その形状及びピッチを高精度に低コストで形成できるため、ＰＤＰの画像の高精細化や大画面化を低製造コストで推進することができるといった産業上極めて有用な効果を発揮する。
【図面の簡単な説明】
【図１】本発明による第１の実施例のプレス成形状態を示す側面図
【図２】図１の金型平板の斜視図
【図３】本発明によってプレス成形された背面基板の斜視図
【図４】本発明による第２の実施例のプレス成形状態を示す側面図
【図５】図４の金型ローラの側面図
【図６】本発明による金型突起の要部断面図
【図７】本発明による金型突起の端部形状を示す側面図
【図８】本発明によるプレス成形状態を示す要部断面図
【図９】従来技術による面放電型カラーＰＤＰの断面構造を示す要部斜視図
【符号の説明】
１金型
１ａ突起
１−１金型平板
１−２金型ローラ
２定盤
３ガラス基板（背面基板）
３ａ隔壁
５送りローラ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a glass substrate with a partition, such as a plasma display panel (hereinafter abbreviated as PDP) incorporated in a display terminal device of a computer.
[0002]
In recent years, PDPs have been widely applied as thin, full-color display devices capable of television display due to the development of colorization, and have been particularly noted as large flat display panels for high-definition video. In order to realize such uses, high definition and large screen of the PDP are required, and low production cost of the PDP is strongly demanded.
[0003]
[Prior art]
As shown in the perspective view of the main part of the cross-sectional structure of the surface discharge type color PDP in FIG. Stripe-shaped partitions 13 are provided on the rear substrate 12 to partition (partition) the unit display elements (sub-pixels) in the row direction in which the mixed discharge gas is sealed.
[0004]
When a partition is formed on the rear substrate, a low-melting glass paste is formed on the rear substrate by a thick-film screen printing method (a glass paste is extruded from a mesh screen with a patterned mask pattern using a squeegee and printed on the substrate) to form a thick film serving as a partition. Is printed in the display area and laminated by repeating a complicated manufacturing process such as drying, baking, annealing and the like, for example, to form a partition having a width of 0.1 mm, a height of 0.15 mm, and a pitch of 0.3 mm. .
[0005]
In this color PDP, the pixels constituting the screen are composed of three sub-pixels of red (R), green (G), and blue (B) arranged in the row direction.
Reference numerals 14 in the drawing denote address electrodes, 15a, 15b, and 15c phosphor layers of red (R), green (G), and blue (B), and two pairs of 16a and 16b are parallel and paired. X and Y sustain electrodes, 17 is a dielectric layer, and 18 is a protective layer.
[0006]
[Problems to be solved by the invention]
However, according to such a method, since the partition walls of the rear substrate are formed by stacking by repeating the thick film screen printing, the printed film thickness becomes non-uniform, the shape of the partition walls is distorted, or the printing mask is not formed. There is a problem that the pitch of the partition walls becomes non-uniform due to the influence of accuracy.
[0007]
In recent years, a technique of printing a partition wall material having a uniform film thickness on a substrate and removing unnecessary portions by a sand blast method or the like using a resist pattern as a mask to form a partition wall has been developed. It is difficult to form a pitch with high precision, and there is also a problem in that reproducibility is low.
[0008]
Further, there is a problem that both methods use a low-melting glass paste, so that the material cost is high, and the manufacturing process is complicated, so that the processing cost is high.
In view of the above problems, an object of the present invention is to provide a method for manufacturing a glass substrate with a partition, which can form the shape and pitch of the partition partitioning the discharge space with high definition at low manufacturing cost.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a method of manufacturing a glass substrate with a partition wall of the present invention is to press a heat-softened glass substrate with a mold having projections corresponding to partition walls that partition a discharge space, A method of forming the partition walls by press-molding the surface into irregularities of a predetermined shape is employed, and at that time, the side surfaces of the protrusions of the mold are formed so that the protrusion thickness gradually decreases toward the protrusion tip, By forming both end surfaces of the projection so that the height of the projection gradually decreases toward the end portion, a sloped or curved partition wall whose side surface is inclined toward the top of the partition wall is formed on the glass substrate, and both ends of the partition wall are formed. The groove bottom between the partition walls of the portion is formed to be a slope or a curved surface .
[0010]
As described above, the heat-softened substrate is pressurized with a mold, and a predetermined region of the substrate surface is press-formed into irregularities and the partition is integrally formed by one press, so that the shape and pitch of the partition can be reduced at a low manufacturing cost. Uniform and high definition. In addition , by forming the groove bottom between the partition walls at both ends of the partition wall on a slope or a curved surface, when forming an address electrode at the groove bottom between the partition walls, the address electrode is led out to the peripheral portion outside the partition formation region without a step. Therefore, the address electrodes can be formed without disconnection.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the gist of the present invention will be described based on each embodiment shown in the drawings.
FIG. 3 shows a method for manufacturing a glass substrate with a partition wall according to the present invention. For example, the case where the partition wall 3a having a width A of 0.1 mm, a height B of 0.15 mm, and a pitch P of 0.3 mm is formed on the rear substrate 3 by press molding will be described in detail.
[0012]
FIG. 1 is a side view showing a first embodiment of press molding according to the present invention. As shown in the figure, the rear substrate 3 is sandwiched between the mold flat plate 1-1 as the mold 1 and the surface plate 2, and press-molding is performed.
[0013]
As shown in FIG. 2, the mold flat plate 1-1 is a rectangular heat-resistant metal plate having a size enough to cover the rear substrate and having a sufficient thickness to withstand the pressing force, and has a width W of 0.2 mm corresponding to the partition wall of the rear substrate. A protrusion 1a having a height H of 0.15 mm and a pitch P of 0.3 mm is formed in a predetermined area. (Because incomplete molding is formed at both ends in the longitudinal direction of the partition wall, make it larger than the display area by that amount.)
This mold plate 1-1 is attached to the pressurizing head 4a of the press device as shown in FIG. 1, and the surface of the plate is made uniform by a temperature-adjustable sheath heater (not shown) provided in the mold plate 1-1. Heat and hold at about 800 ° C.
[0014]
The surface plate 2 on which the back substrate 3 is placed is placed and fixed on a holder base 4b of a press device. The platen 2 is made of a heat-resistant rectangular material having a thickness sufficient to withstand the pressing force, and has a concave portion 2a for receiving the back substrate 3, and the inner surface of the concave portion 2a is finished with good flatness and smoothness. The mutual positional relationship between the concave portion 2a of the surface plate 2 and the mold plate 1-1 is accurately set in advance.
[0015]
In order to press-form the partition on the back substrate 3, the back substrate 3 made of soda lime glass, which has been heated and softened to about 700 ° C. in advance in another heating furnace, is placed in the recess 2a of the platen 2. The temperature of the back substrate 3 is continuously maintained at about 700 ° C. by a sheath heater (not shown) in the surface plate 2 capable of adjusting the temperature.
[0016]
After the pressure head 4a is lowered and the rear substrate 3 is pressed with the mold flat plate 1-1 at a pressure of about 100 kg / m ² for about 5 minutes, the mold flat plate 1-1 is raised and the rear substrate 3 is lifted. After being gradually cooled to about 600 ° C. so as not to be deformed, it is taken out.
[0017]
As shown in FIG. 3, a partition wall having a width of 0.1 mm, a height of 0.15 mm and a pitch of 0.3 mm is formed on the surface of the press-formed rear substrate 3 in predetermined regions except for incompletely formed portions at both ends. A rear substrate with a partition for PDP on which 3a is formed is completed.
[0018]
In addition, since the back plate is press-molded in a heated and softened state and then cooled and shrunk after molding, the mold flat plate is manufactured in advance by correcting the total pitch of the projections by the shrinkage.
[0019]
According to this manufacturing method, since the partition is integrally formed on the back substrate by one press molding using a mold flat plate, the shape (width and height) and pitch of the partition are very uniform and high in any place. The unit display elements can be formed with high definition, the unit display elements can be completely separated, and stable display without excessive lighting or defects can be performed. Further, since the partition walls are press-molded on the rear substrate itself, a new partition material cost and a complicated manufacturing process are not required, and a high-quality PDP can be manufactured at a low manufacturing cost.
[0020]
In addition, the address electrode conventionally formed before the formation of the partition can be formed in the groove between the partition without any particular trouble even after the formation of the partition.
In order to complete the PDP, although not shown, for example, an address electrode is formed at the bottom of the groove between the partitions on the rear substrate in the next step, and a phosphor layer is formed on the side surface of the partition and on the address electrodes by screen printing or the like. I do. Then, the front substrate on which the X and Y sustain electrodes, the dielectric layer, and the protective layer are formed, and the rear substrate on which the address electrodes and the red, green, and blue phosphor layers are formed are combined with each other. The Y-sustain electrode and the address electrode are arranged so as to be orthogonal to each other, and the periphery of both substrates is hermetically sealed. After that, the space between the two substrates is evacuated to a vacuum, and a discharge gas such as Ne + Xe is sealed therein to form a PDP. Complete.
[0021]
When a predetermined voltage is applied to the X and Y sustain electrodes and address electrodes of the PDP, discharge occurs in a predetermined discharge space, and the phosphor layer emits light with ultraviolet rays generated by the discharge, thereby displaying color images and information. be able to.
[0022]
FIG. 4 is a side view showing a second embodiment of the press molding according to the present invention. As shown in the drawing, the rear substrate 3 is sandwiched between the die roller 1-2, which is the die 1, and the feed roller 5, and press-formed by pressurizing means (not shown) while driving and rotating.
[0023]
The feed roller 5 is a cylindrical body made of a heat-resistant metal and has a flat cylindrical surface, and is disposed opposite to the mold roller 1-2 in a pair, and is driven to rotate by a driving unit (not shown).
[0024]
As shown in FIG. 5, the mold roller 1-2 is a cylindrical body made of a heat-resistant metal, and has a width of 0.2 mm so that the partition wall of the back substrate is formed in a predetermined region of the cylindrical surface by one rotation of the cylindrical body. A projection 1a having a height of 0.15 mm and a pitch of 0.3 mm is provided.
[0025]
A roller conveyor 6 in which a plurality of transport rollers rotated by driving means (not shown) are arranged before and after the feed roller 5 to feed and unload the rear substrate 3.
[0026]
The positional relationship between the partition wall forming position of the rear substrate and the protrusion of the mold roller is set in advance so that the partition wall is formed in a predetermined region of the rear substrate, and the rear substrate is formed by a pair of the mold roller and the feed roller. When it is intermittently supplied, the feed roller is driven to rotate in synchronization with the feeding of the back substrate.
[0027]
Each of the mold roller and the feed roller has a sheath heater (not shown) capable of adjusting the temperature inside, and heats and maintains the roller surface at a temperature of about 800 ° C.
In order to press-mold the partition walls on the back substrate, a back substrate made of soda glass heated in advance to about 700 ° C. in another heating furnace is placed between a mold roller and a feed roller at a pressure of about 10 kg / m, about 10 cm / After passing through while pressurizing at a speed of 1 minute, after passing, the substrate 3 is gradually cooled to about 600 ° C. so as not to be deformed, and then transported and taken out again.
[0028]
Similar to FIG. 3 of the first embodiment, a partition having a width of 0.1 mm, a height of 0.15 mm, and a pitch of 0.3 mm is press-formed in the transport direction on the rear substrate. It is formed uniformly and with high definition even in places. Further, in the second embodiment, since the rear substrate can be hot press-formed while being rotationally pressed, the rear substrate can be intermittently conveyed to form the partition.
[0029]
Alternatively, although not shown, as another manufacturing method, the mold roller of the second embodiment is used instead of the mold flat plate of the first embodiment, and the mold roller is pressed in parallel to the surface plate. The partition wall may be formed by rolling and hot pressing.
[0030]
As shown in FIGS. 6 (a) and 6 (b), the mold flat plate or mold roller used in the first and second embodiments has the side surface of the projection 1a inclined (FIG. 6 (a) or curved surface [ 6 (b), a draft is formed, and both end surfaces in the longitudinal direction of the projection 1a which are not involved in the formation of the discharge space shown in FIGS. 7 (a) and 7 (b) are also inclined surfaces [FIG. 7 (a) or curved surfaces [FIG. It is desirable to form a draft at 7 (b), thereby facilitating removal of the molded die and preventing chipping of the edge of the partition wall.
[0031]
In addition, there is a step between the peripheral surface outside the predetermined area where the partition wall is formed and the bottom surface of both ends of the groove between the partition walls, but the groove bottom of both ends is formed on a slope or a curved surface. This effectively acts to lead the address electrode formed at the bottom of the groove between the partition walls to the peripheral surface without any step.
[0032]
As shown in FIG. 8, the size of the protrusion 1a of the mold flat plate 1-1 (or the mold roller 1-2) of the above embodiment is based on the surface of the peripheral portion 3b of the rear substrate 3 where the partition wall 3a is not formed. The cross-sectional area S _{1 of the} tip of the protrusion 1a from this reference plane (the hatched portion rising to the left) and the cross-sectional area S ₂ of the groove 1a-1 between the protrusions 1a on the opposite side (the hatched portion rising to the right) are made substantially equal. I have.
[0033]
That is, in order to form the partition wall 3a having a width of 0.1 mm, a height of 0.15 mm and a pitch of 0.3 mm, the protrusion 1a is formed to have a height of 0.15 mm, a height from a reference plane of 0.1 mm, and a width of 0.2 mm. , when the pitch 0.3 mm, the reference line passing through the surface of the peripheral portion of the height of the projection 1a 1: 2 to become a position dividing 1/3 of the projection 1a is pushed to the rear substrate 3 S ₁ and S ₂ becomes almost equal. Note that the height of the partition wall (the leftmost end in FIG. 8) adjacent to the peripheral portion is about １／ because there is no swelling from one side, but it does not contribute to the formation of the discharge space.
[0034]
By forming the partition of the rear substrate under such conditions, the peripheral portion other than the region where the projection is formed is not pressed by the mold, so that the viscosity at the time of press molding of the substrate can be increased to some extent. Furthermore, by reducing the height of the portions at both ends in the longitudinal direction of the projections where no discharge space is formed toward the ends, deformation due to pressure applied to the peripheral portion is hardly caused, and molding with less stress can be performed. Therefore, the temperature of the substrate and the mold at the time of press molding can be lowered, and the annealing time can be shortened to improve mass productivity.
[0035]
In any of the embodiments described above, since the partition walls are integrally formed by the substrate itself by one pressing step, it is not necessary to form the partition walls by a complicated manufacturing process as in the related art, and the manufacturing process is greatly simplified. . In addition, the use of a mold provides reproducibility, stabilizes the dimensions and quality of the partition walls, improves display quality, and significantly reduces material and processing costs.
[0036]
【The invention's effect】
As described above in detail, according to the present invention, since the partition walls for partitioning a discharge space such as a color PDP can be formed with high accuracy and low cost by press molding using a mold, the PDP image can be formed. An extremely useful effect in industry, such as high definition and large screen, can be promoted at low manufacturing cost.
[Brief description of the drawings]
FIG. 1 is a side view showing a press-formed state of a first embodiment according to the present invention. FIG. 2 is a perspective view of a mold flat plate of FIG. 1. FIG. 3 is a perspective view of a rear substrate pressed by the present invention. FIG. 4 is a side view showing a press-formed state of the second embodiment according to the present invention. FIG. 5 is a side view of the mold roller of FIG. 4; FIG. FIG. 8 is a side view showing the shape of the end of a mold projection according to the present invention. FIG. 8 is a cross-sectional view of a main part showing a press-formed state according to the present invention. Perspective view [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Die 1a Protrusion 1-1 Die flat plate 1-2 Die roller 2 Surface plate 3 Glass substrate (back substrate)
3a Partition wall 5 Feed roller

Claims

A discharge space in a mold having projections corresponding to the partitions Ru partition wall, when a glass substrate heated softened pressurized by press-forming the surface of the glass substrate to the unevenness of a prescribed shape to form the partitions, the By forming the side surfaces of the protrusion of the mold so that the protrusion thickness gradually decreases toward the protrusion tip, and forming the both end surfaces of the protrusion so that the protrusion height gradually decreases toward the end portion, Forming a sloped or curved partition whose side surface is inclined toward the top of the partition on the glass substrate, and forming a groove bottom between the partitions at both ends of the partition on a slope or a curved surface. A method for manufacturing a glass substrate.

The protrusions of the mold are formed so that the cross-sectional area of the protrusion above the reference surface and the cross-sectional area between the protrusions below the reference surface are substantially equal to each other with reference to the surface of the peripheral portion of the glass substrate where the partition wall is not formed. The method for producing a glass substrate with a partition according to claim 1, wherein:

The mold is a mold roller formed of a cylindrical body having a peripheral surface forming a partition wall in one rotation, and the heating is performed between a feed roller disposed opposite to the mold roller and the mold roller. Feeding the softened glass substrate, press-molding the glass substrate sandwiched between both rollers by the mold roller while conveying the glass substrate by the feed roller, and forming a partition on the surface of the glass substrate. method for producing a partition wall with the glass substrate according to claim 1 or 2.

The method for manufacturing a glass substrate with a partition according to any one of claims 1 to 3 , wherein the mold maintains a heated state at a predetermined temperature during press molding.