JPH08281177A - Method for applying coating liquid and apparatus therefor - Google Patents
Method for applying coating liquid and apparatus thereforInfo
- Publication number
- JPH08281177A JPH08281177A JP9226795A JP9226795A JPH08281177A JP H08281177 A JPH08281177 A JP H08281177A JP 9226795 A JP9226795 A JP 9226795A JP 9226795 A JP9226795 A JP 9226795A JP H08281177 A JPH08281177 A JP H08281177A
- Authority
- JP
- Japan
- Prior art keywords
- glass bulb
- coating liquid
- coating
- liquid
- suction pad
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は塗布液の塗布装置及び
その塗布方法に関し、特に液晶表示装置に適用されるバ
ックライトユニットの冷陰極蛍光ランプにおけるガラス
バルブへの蛍光体塗布液の真空吸引による塗布装置並び
にその塗布方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating liquid coating apparatus and a coating method therefor, and more particularly to vacuum coating of a phosphor coating liquid onto a glass bulb in a cold cathode fluorescent lamp of a backlight unit applied to a liquid crystal display device. The present invention relates to improvement of a coating device and a coating method thereof.
【０００２】[0002]
【従来の技術】一般に、液晶表示装置に適用されるバッ
クライトユニットの光源には、冷陰極蛍光ランプが小形
化に適していることから広く採用されている。2. Description of the Related Art Generally, a cold cathode fluorescent lamp is widely used as a light source of a backlight unit applied to a liquid crystal display device because it is suitable for downsizing.
【０００３】この冷陰極蛍光ランプは、例えばバルブ内
径が６ｍｍ程度のガラスバルブの内面に発光層を形成す
ると共に、ガラスバルブのそれぞれの端部に電極を封止
・配置して構成されている。This cold cathode fluorescent lamp is constructed, for example, by forming a light emitting layer on the inner surface of a glass bulb having an inner diameter of about 6 mm, and sealing and disposing electrodes at each end of the glass bulb.
【０００４】この冷陰極蛍光ランプにおいて、発光層
は、例えば図５に示す塗布装置を用いて形成されてい
る。即ち、まず、直立状態に支持されたガラスバルブＡ
の上端開口部に塗布ヘッドＢを配置する。次に、操作杆
Ｃａを手による押圧操作によって弁Ｃを図示点線位置ま
で押し下げると、図示矢印のように蛍光体塗布液が流れ
る。そして、塗布液はガラスバルブＡの内面に沿って流
れ落ちることによって、その内面に塗布膜が形成され
る。然る後、乾燥し、５００〜６００℃程度の温度にて
焼成することにより発光層が形成される。In this cold cathode fluorescent lamp, the light emitting layer is formed by using, for example, a coating apparatus shown in FIG. That is, first, the glass bulb A supported in an upright state.
The coating head B is arranged at the upper end opening of the. Next, when the valve C is pushed down to the position shown by the dotted line in the figure by manually pressing the operating rod Ca, the phosphor coating solution flows as shown by the arrow in the figure. Then, the coating liquid flows down along the inner surface of the glass bulb A to form a coating film on the inner surface. After that, the light emitting layer is formed by drying and baking at a temperature of about 500 to 600 ° C.
【０００５】この装置によれば、ガラスバルブＡに良好
な発光層を形成できるものであるが、ガラスバルブの内
径が例えば３ｍｍのように細径化されると、上述の塗布
装置もガラスバルブ内に挿入できる程度に細くしなけれ
ばならない。これに応じて、弁Ｃも極めて細くなるため
に、操作時に弁Ｃが変形し易くなる。従って、塗布液の
流出量が一定になるような制御ができなくなり、塗布膜
の膜厚にバラツキが生じて輝度分布の均一性が得られな
くなったり、さらには塗布膜にすじ状の膜不良などが発
生し塗布不良が２０％にも達するという問題がある。According to this apparatus, a good light emitting layer can be formed on the glass bulb A. However, when the inner diameter of the glass bulb is reduced to, for example, 3 mm, the above-mentioned coating apparatus also works inside the glass bulb. It must be thin enough to be inserted into. Accordingly, the valve C also becomes extremely thin, so that the valve C is easily deformed during operation. Therefore, it becomes impossible to control the flow rate of the coating liquid to be constant, the thickness of the coating film varies, and the uniformity of the luminance distribution cannot be obtained. Occurs and the coating failure reaches 20%.
【０００６】[0006]
【発明が解決しようとする課題】従って、このような問
題を解決するために、図６に示すように真空吸引を利用
した吸い上げ方式の塗布装置が提案されている。Therefore, in order to solve such a problem, a suction type coating apparatus utilizing vacuum suction has been proposed as shown in FIG.
【０００７】この装置は、直立状態に支持されたガラス
バルブＡの上端開口部に密接された、内部にテ−パ−状
の吸引孔Ｄａを有する吸引パッドＤと、この吸引パッド
Ｄに真空経路Ｅ，減圧弁Ｆ，電磁弁Ｇを介して接続され
た真空ポンプＨと、ガラスバルブＡの下端開口部が塗布
液Ｋに浸漬されるように配置した塗布液槽Ｊとから構成
されている。In this apparatus, a suction pad D having a taper-shaped suction hole Da therein, which is closely contacted with an upper end opening of a glass bulb A supported in an upright state, and a vacuum path to the suction pad D. E, a pressure reducing valve F, a vacuum pump H connected via a solenoid valve G, and a coating liquid tank J arranged so that the lower end opening of the glass valve A is immersed in the coating liquid K.
【０００８】この装置による発光層の形成は、次のよう
に行われる。まず、同図に示すように、ガラスバルブＡ
の下端開口部を塗布液Ｋに浸漬した状態で真空ポンプＨ
を駆動させると共に電磁弁Ｇを作動させると、真空経路
Ｅ及びガラスバルブＡの内部が減圧される。このため
に、塗布液ＫはガラスバルブＡの内部を充実させなが
ら、その液面を上昇させる。そして、液面が所定の高さ
にまで達したならば、電磁弁Ｆを遮断すると、真空経路
Ｅの真空度が急速に低下してしまう。このために、ガラ
スバルブ内の液面は降下し、塗布液槽Ｊにおける塗布液
Ｋの液面とほぼ同一になる。この際に、ガラスバルブＡ
の内面には蛍光体の塗布膜が形成される。以下、上述方
法と同様の工程を経て発光層が形成される。The light emitting layer is formed by this apparatus as follows. First, as shown in FIG.
Vacuum pump H with the lower end opening immersed in coating solution K
When the solenoid valve G is operated and the solenoid valve G is operated, the inside of the vacuum path E and the glass valve A is depressurized. Therefore, the coating liquid K raises the liquid level of the glass bulb A while filling the inside of the glass bulb A. When the liquid level reaches a predetermined height, the electromagnetic valve F is shut off, and the degree of vacuum in the vacuum path E is rapidly reduced. For this reason, the liquid level in the glass bulb drops and becomes almost the same as the liquid level of the coating liquid K in the coating liquid tank J. At this time, the glass bulb A
A coating film of a phosphor is formed on the inner surface of the. Hereinafter, the light emitting layer is formed through the same steps as the above method.
【０００９】この方法によれば、ガラスバルブが細径化
されても、その内面に良好な塗布膜を形成でき、塗布不
良を大幅に低減できるものである。According to this method, even if the diameter of the glass bulb is reduced, a good coating film can be formed on the inner surface of the glass bulb, and coating defects can be greatly reduced.
【００１０】しかしながら、塗布液が所定高さにまで到
達した際に、その液面が図６に示すように波打って一定
にならないという現象が生ずる。このままでランプ化す
ると、バルブ軸方向の輝度分布が均一になりにくい上、
商品性も損なわれる。従って、発光層の形成後に、図示
しないスクレ−パ−によって波打ち部分の発光層を一部
削りとって修正しているために、作業性が阻害されると
いう問題がある。However, when the coating liquid reaches a predetermined height, the liquid surface wavy as shown in FIG. 6 and is not constant. If it is made into a lamp as it is, it is difficult for the brightness distribution in the bulb axis direction to be uniform, and
Merchandise is also compromised. Therefore, there is a problem that workability is hindered because after the formation of the light emitting layer, the light emitting layer in the corrugated portion is partially shaved and corrected by a scraper (not shown).
【００１１】それ故に、本発明の目的は、簡単な構成に
より塗布液が所定高さにまで到達しても液面に波打ち現
象が生じず、商品性に優れた塗布膜の得られる塗布液の
塗布装置及びその塗布方法を提供することにある。Therefore, an object of the present invention is to provide a coating solution which has a simple structure and does not cause a wavy phenomenon on the liquid surface even when the coating solution reaches a predetermined height, and which provides a coating film having excellent commercial properties. An object is to provide a coating device and a coating method thereof.
【００１２】[0012]
【課題を解決するための手段】従って、本発明は、上述
の目的を達成するために、バルブ内径が２〜１０ｍｍの
ガラスバルブを直立状態に支持する支持手段と、支持手
段にて支持されたガラスバルブの上端開口部に当接する
吸引パッドと、吸引パッドに接続した真空系と、ガラス
バルブの下端開口部が塗布液に浸漬されるように配置し
た塗布液槽と、ガラスバルブ上端の側方に配置し、塗布
液の液面が所定高さになった時にそれの出力信号に基づ
いて真空系を遮断する液面センサとを具備し、前記吸引
パッドは、真空系に連通する吸引孔を有し、その吸引孔
の大きさをガラスバルブの内径の１〜２５％の範囲に設
定したものであり、本発明の第２の発明は、前記吸引パ
ッドにおける吸引孔の大きさをガラスバルブ内径の５〜
２０％の範囲に設定したものであり、第３の発明は、前
記吸引パッドのガラスバルブに当接する部分を弾力性な
いし柔軟性を有する部材にて構成したものであり、第４
の発明は、前記真空系を、少なくとも真空経路，減圧
弁，電磁弁，真空ポンプにて構成したことを特徴とし、
さらに第５の発明は、前記電磁弁を、液面センサの液面
検出信号に基づいて制御することを特徴とする。Therefore, in order to achieve the above-mentioned object, the present invention is supported by a supporting means for supporting a glass bulb having an inner diameter of 2 to 10 mm in an upright state, and the supporting means. A suction pad that comes into contact with the upper opening of the glass bulb, a vacuum system connected to the suction pad, a coating liquid tank arranged so that the lower opening of the glass bulb is immersed in the coating liquid, and a lateral side of the upper end of the glass bulb. And a liquid level sensor that shuts off the vacuum system based on an output signal of the liquid level when the liquid level of the coating liquid reaches a predetermined height, and the suction pad has a suction hole communicating with the vacuum system. The size of the suction hole is set in a range of 1 to 25% of the inner diameter of the glass bulb, and the second invention of the present invention is to set the size of the suction hole in the suction pad to the inner diameter of the glass bulb. 5 of
According to a third aspect of the present invention, the portion of the suction pad that comes into contact with the glass bulb is formed of a member having elasticity or flexibility.
In the invention, the vacuum system is configured by at least a vacuum path, a pressure reducing valve, a solenoid valve, and a vacuum pump,
Further, the fifth invention is characterized in that the solenoid valve is controlled based on a liquid level detection signal of a liquid level sensor.
【００１３】又、本発明の第６の発明は、バルブ内径が
２〜１０ｍｍのガラスバルブを直立状態に支持する工程
と、ガラスバルブの下端開口部を粘度が５０〜２００ｃ
ｐｓの塗布液に浸漬させる工程と、ガラスバルブの上端
開口部に、ガラスバルブ内径の１〜２５％の範囲に設定
された吸引孔を有する吸引パッドを密接する工程と、吸
引パッドを真空系に接続し塗布液をガラスバルブの所定
高さまで吸い上げた後、真空系を遮断する工程とを含む
ことを特徴とし、第７の発明は、前記吸引パッドにおけ
る吸引孔の大きさをガラスバルブ内径の５〜２０％の範
囲に設定したことを特徴とし、第８の発明は、前記吸引
パッド部分における真空度を５〜１０Ｋパスカルの範囲
に設定したことを特徴とする。A sixth aspect of the present invention is the step of supporting a glass bulb having an inner diameter of 2 to 10 mm in an upright state, and the lower end opening of the glass bulb has a viscosity of 50 to 200 c.
a step of immersing in a coating solution of ps, a step of bringing a suction pad having a suction hole set within a range of 1 to 25% of the inner diameter of the glass bulb into close contact with the upper end opening of the glass bulb, and a suction pad in a vacuum system A seventh aspect of the invention is characterized in that after connecting and sucking up the coating liquid to a predetermined height of the glass bulb, the vacuum system is shut off. The eighth aspect of the present invention is characterized in that the vacuum degree in the suction pad portion is set in the range of 5 to 10K pascals.
【００１４】[0014]
【作用】上述の構成によれば、ガラスバルブの上端開口
部に、バルブ内径の１〜２５％の範囲に設定された吸引
孔を有する吸引パッドを当接すると共に、下端開口部を
塗布液に浸漬した状態において、吸引パッドを介してガ
ラスバルブ内を減圧すると、ガラスバルブ内は塗布液で
所定高さまで充実される。その後、減圧を解除すること
により、塗布液面は降下してガラスバルブ内面には塗布
膜が形成される。特に、吸引孔はバルブ内径の１〜２５
％の範囲に設定されているために、塗布液が所定高さま
で到達しても液面の波打ち現象はなく、均一高さの塗布
膜が得られる。According to the above construction, the suction pad having the suction hole set in the range of 1 to 25% of the inner diameter of the bulb is brought into contact with the upper end opening of the glass bulb, and the lower end opening is immersed in the coating liquid. In this state, when the pressure inside the glass bulb is reduced via the suction pad, the inside of the glass bulb is filled with the coating liquid to a predetermined height. After that, by releasing the reduced pressure, the coating liquid surface is lowered and a coating film is formed on the inner surface of the glass bulb. Especially, the suction hole is 1 to 25 of the inner diameter of the valve.
Since it is set in the range of%, even when the coating liquid reaches a predetermined height, there is no waviness of the liquid surface, and a coating film having a uniform height can be obtained.
【００１５】[0015]
【実施例】次に、本発明の１実施例について図１を参照
して説明する。同図において、１はバルブ内径が２〜１
０ｍｍの硼・珪酸ガラスよりなるガラスバルブであっ
て、図示しない支持手段によって直立状態に支持されて
いる。尚、ガラスバルブ１は硼・珪酸ガラスの他、ソ−
ダガラス，鉛ガラス，低鉛ガラスなども使用できる。こ
のガラスバルブ１の上端開口部１ａには吸引パッド２が
着脱自在なるように密接（当接）されている。この吸引
パッド２は、例えば中心に吸引孔３ａ及び４ａを有する
第１のパッド３及び第２のパッド４から構成されてい
る。例えば第１のパッド３はシリコンゴムにて、第２の
パッド４はスポンジにて形成されており、それぞれの吸
引孔３ａ，４ａの大きさはバルブ内径の１〜２５％の範
囲に設定されているが、５〜２０％の範囲が好ましい。
尚、それぞれのパッドの構成部材は、シリコンゴム，ス
ポンジ以外の弾力性ないし柔軟性を有する部材を適用す
ることもできる。この吸引パッド２には、真空経路５，
減圧弁６，電磁弁７を介して真空ポンプ８が接続されて
いる。又、ガラスバルブ１の上端部分の側方には、液面
センサ９が配置されており、塗布液面の検出に基づいて
出力される信号によって電磁弁７が開閉制御される。一
方、ガラスバルブ１の下端開口部１ｂは塗布液槽１０
に、塗布液１１に浸漬されるように配置されている。こ
の塗布液１１は、例えば蛍光体，バインダ，溶剤にて構
成されており、粘度は５０〜２００ｃｐｓ好ましくは１
００〜１５０ｃｐｓの範囲に設定されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIG. In the figure, 1 is a valve inner diameter of 2 to 1.
A glass bulb of 0 mm boro-silicate glass, which is supported upright by a supporting means (not shown). In addition to the boro-silicate glass, the glass bulb 1 is made of
Douglas, lead glass and low lead glass can also be used. The suction pad 2 is closely attached (contacted) to the upper end opening 1a of the glass bulb 1 so as to be detachable. The suction pad 2 is composed of, for example, a first pad 3 and a second pad 4 having suction holes 3a and 4a in the center. For example, the first pad 3 is made of silicone rubber, the second pad 4 is made of sponge, and the size of the suction holes 3a, 4a is set within the range of 1 to 25% of the valve inner diameter. However, the range of 5 to 20% is preferable.
As a constituent member of each pad, a member having elasticity or flexibility other than silicone rubber and sponge can be applied. This suction pad 2 has a vacuum path 5,
A vacuum pump 8 is connected via a pressure reducing valve 6 and a solenoid valve 7. A liquid level sensor 9 is arranged beside the upper end of the glass bulb 1, and the electromagnetic valve 7 is controlled to open / close by a signal output based on the detection of the coating liquid level. On the other hand, the lower end opening 1b of the glass bulb 1 is the coating liquid tank 10
And is disposed so as to be immersed in the coating liquid 11. The coating liquid 11 is composed of, for example, a phosphor, a binder, and a solvent, and has a viscosity of 50 to 200 cps, preferably 1
It is set in the range of 00 to 150 cps.
【００１６】次に、ガラスバルブへの発光層の形成方法
について図１〜図４を参照して説明する。まず、図１に
示すように、ガラスバルブ１を支持手段にて直立状態に
支持すると共に、下端開口部１ｂを塗布液１１に１〜３
ｍｍ程度浸漬させる。そして、ガラスバルブ１の上端開
口部１ａに吸引パッド２における第２のパッド４を密接
させる。次に、図２に示すように、真空ポンプ８を駆動
させるか、又は真空ポンプ８は駆動させたままで電磁弁
７を図示しないスイッチによって作動させる。これによ
って、減圧弁６を介して真空経路５，ガラスバルブ１は
大気圧より減圧状態になる。従って、塗布液１１は、ガ
ラスバルブ１の内部を充実させながら上昇する。そし
て、液面が所定高さに到達すると、液面センサ９が液面
を検出して検出信号を出力する。この出力信号に基づい
て電磁弁７が閉成動作し、真空吸引を停止させる。この
結果、液面は、図３に示すように、降下する。この際
に、ガラスバルブ１の内面には塗布膜１１ａが形成され
る。次に、ガラスバルブ１から吸引パッド２を除去する
と共に、ガラスバルブを支持手段から取り外し、下端部
分の外面に付着している塗布液を除去する。そして、こ
の塗布膜１１ａを乾燥した後、焼成することによって図
４に示すように発光層１１ｂが形成される。Next, a method of forming the light emitting layer on the glass bulb will be described with reference to FIGS. First, as shown in FIG. 1, the glass bulb 1 is supported in an upright state by a supporting means, and the lower end opening 1b is applied to the coating liquid 11 in an amount of 1 to 3.
Immerse about mm. Then, the second pad 4 of the suction pad 2 is brought into close contact with the upper end opening 1a of the glass bulb 1. Next, as shown in FIG. 2, the vacuum pump 8 is driven, or the solenoid valve 7 is operated by a switch (not shown) while the vacuum pump 8 is still driven. As a result, the vacuum path 5 and the glass valve 1 are depressurized from the atmospheric pressure via the depressurizing valve 6. Therefore, the coating liquid 11 rises while filling the inside of the glass bulb 1. Then, when the liquid level reaches a predetermined height, the liquid level sensor 9 detects the liquid level and outputs a detection signal. The solenoid valve 7 is closed based on this output signal, and vacuum suction is stopped. As a result, the liquid surface drops as shown in FIG. At this time, the coating film 11a is formed on the inner surface of the glass bulb 1. Next, the suction pad 2 is removed from the glass bulb 1, the glass bulb is removed from the supporting means, and the coating liquid adhering to the outer surface of the lower end portion is removed. Then, the coating film 11a is dried and then baked to form the light emitting layer 11b as shown in FIG.
【００１７】この方法によれば、吸引パッド２における
吸引孔３ａ，４ａの大きさ（孔径）は、バルブ内径の１
〜２５％の範囲に設定されているために、塗布液１１の
液面がガラスバルブ１の上端開口部１ａの近辺にまで上
昇しても、液面の波打ち現象は発生しない。従って、発
光層１１ｂの高さが均一となり、輝度分布に好影響を及
ぼす。特に、その設定範囲が５〜２０％の場合に、顕著
である。According to this method, the size (hole diameter) of the suction holes 3a, 4a in the suction pad 2 is 1 of the valve inner diameter.
Since it is set in the range of ˜25%, the corrugation phenomenon of the liquid surface does not occur even if the liquid surface of the coating liquid 11 rises near the upper end opening 1a of the glass bulb 1. Therefore, the height of the light emitting layer 11b becomes uniform, which has a favorable effect on the luminance distribution. In particular, it is remarkable when the set range is 5 to 20%.
【００１８】又、ガラスバルブ１の上端側方には、液面
センサ９が配置されているために、塗布液の液面が所定
の高さにまで到達すると、直ちに作動して真空系（例え
ば電磁弁７）を遮断する。このために、液面高さを常に
一定に維持できるのみならず、塗布液の真空系への侵入
をも防止できる。Further, since the liquid level sensor 9 is arranged on the side of the upper end of the glass bulb 1, when the liquid level of the coating liquid reaches a predetermined height, the liquid level sensor 9 is activated immediately to generate a vacuum system (for example, a vacuum system). Shut off the solenoid valve 7). For this reason, not only can the liquid level be maintained constant at all times, but it is also possible to prevent the coating liquid from entering the vacuum system.
【００１９】さらには、塗布液１１の粘度が５０〜２０
０ｃｐｓに設定されているために、塗布膜１１ａの塗り
肌がよい上、ピ−リングの発生もなく、優れた外観特性
が得られるのみならず、作業性も改善できる。Furthermore, the viscosity of the coating liquid 11 is 50 to 20.
Since it is set to 0 cps, the coating film 11a has a good coating surface, peeling does not occur, excellent appearance characteristics can be obtained, and workability can be improved.
【００２０】次に、本発明者らは、バルブ内径が６ｍ
ｍ，長さが３００ｍｍの硼珪酸ガラスを直立状態に支持
し、その下端を３ｍｍだけ粘度が１００ｃｐｓの蛍光体
塗布液に浸漬すると共に上端開口部に吸引パッドを密接
させて上述の塗布方法にて塗布液を塗布し、バルブ内径
に対する吸引パッドにおける吸引孔の大きさ（％）と塗
布性（塗布作業のやりやすさ），塗布液面の波立ちとの
関係について検討したところ、表１に示す結果が得られ
た。Next, the present inventors have found that the valve inner diameter is 6 m.
A borosilicate glass having a length of m and a length of 300 mm is supported in an upright state, the lower end thereof is immersed in a phosphor coating liquid having a viscosity of 100 cps for 3 mm, and a suction pad is brought into close contact with the upper end opening by the above coating method. When the coating liquid was applied and the relationship between the size (%) of the suction hole in the suction pad with respect to the valve inner diameter, the coating property (easiness of coating work), and the ripple of the coating liquid surface was examined, the results shown in Table 1 were obtained. was gotten.
【００２１】[0021]
【表１】 [Table 1]
【００２２】この結果によれば、ＮＯ１バルブは、塗布
液の吸い上げに長い時間を要し作業性が著しく低く、生
産工程への適用は難しい。ＮＯ２〜ＮＯ９バルブは一応
量産性に耐えられるものであることを示している。又、
波立ちについては、ＮＯ１〜ＮＯ８バルブは実用上支障
となるような波立ちはないが、ＮＯ９バルブで生じてい
る。従って、吸引孔の大きさは、１．０〜２５．０％の
範囲が望ましい。According to this result, the NO1 valve requires a long time to suck up the coating liquid, and the workability is extremely low, and it is difficult to apply it to the production process. It is shown that the NO2 to NO9 valves can endure mass productivity. or,
Regarding the ripples, the NO1 to NO8 valves do not have the ripples that hinder the practical use, but they occur in the NO9 valve. Therefore, the size of the suction hole is preferably in the range of 1.0 to 25.0%.
【００２３】又、本発明者らは、バルブ内径が６ｍｍの
硼珪酸ガラスを用いると共に吸引パッドの吸引孔の大き
さを５％に設定し、塗布液の粘度と塗布性，塗布膜にお
ける塗り肌，ピ−リングとの関係について検討したとこ
ろ、表２に示す結果が得られた。Further, the inventors of the present invention used borosilicate glass having a valve inner diameter of 6 mm and set the size of the suction hole of the suction pad to 5% to determine the viscosity and coating property of the coating liquid and the coating surface of the coating film. , And the relationship with peeling was examined, and the results shown in Table 2 were obtained.
【００２４】[0024]
【表２】 [Table 2]
【００２５】この結果によれば、ＮＯ１０〜２１バルブ
は塗布液の粘度が４０〜２００ｃｐｓの範囲において塗
布性及びピ−リングについて優れた結果が得られている
が、塗り肌についてはＮＯ１２〜ＮＯ２２バルブが優れ
た結果が得られている。従って、塗布液の粘度は５０〜
２００ｃｐｓの範囲に設定することが望ましい。According to these results, the NO10 to 21 valves show excellent results in coating property and peeling when the viscosity of the coating liquid is in the range of 40 to 200 cps. Has obtained excellent results. Therefore, the viscosity of the coating solution is 50-
It is desirable to set it in the range of 200 cps.
【００２６】しかしながら、塗布液の粘度が５０ｃｓｐ
未満になると、塗り肌が悪くなり実用に供し得なくなる
し、逆に２００ｃｐｓを越えると、塗布スピ−ドが遅く
塗布性が損なわれるのみならずピ−リングも発生し易く
なり好ましくない。又、吸引孔のバルブ内径に対する大
きさは１％未満になると、吸引孔に異物が詰まり易くな
る上に塗布スピ−ドが遅く塗布性が損なわれるし、逆に
２５％を越えると、塗布液面が踊って波立ち外観性に優
れた塗布膜が得られなくなる。さらに、バルブ内径は２
ｍｍ未満になると、塗布膜の形成自体が困難になるし、
逆に１０ｍｍを越えると、機械的強度の大きい塗布ヘッ
ド（図５参照）の使用が可能となり、真空を利用した吸
い上げ塗布方法を採用する必要性がなくなる。However, the viscosity of the coating solution is 50 csp.
When the amount is less than the above range, the coated surface becomes unusable and cannot be put to practical use. On the contrary, when the amount exceeds 200 cps, the coating speed is slow, coating property is impaired, and peeling easily occurs, which is not preferable. If the size of the suction hole with respect to the inner diameter of the valve is less than 1%, the suction hole is likely to be clogged with foreign matter, and the coating speed is slow and the coating property is impaired. The surface dances and the coating film with excellent appearance cannot be obtained. In addition, the valve inner diameter is 2
If it is less than mm, it becomes difficult to form the coating film itself,
On the other hand, when it exceeds 10 mm, it becomes possible to use a coating head having a large mechanical strength (see FIG. 5), and it becomes unnecessary to adopt a suction coating method using a vacuum.
【００２７】尚、本発明は、何ら上記実施例に制約され
ることなく、例えば塗布液はガラスバルブの１本づつに
塗布する他、複数の吸引パッドを使用して複数のガラス
バルブについて一括して塗布することもできる。又、塗
布液は有機溶剤を用いたものの他、水溶性バインダを用
いたものも使用できる。特に、水溶性バインダを用いた
塗布液を適用する場合、塗布液中の泡が効果的に真空脱
泡できる関係で、良好な塗布膜が得られる。又、液面セ
ンサは光反射形の他、透過形なども使用できるし、或い
はその他のセンサを適用することもできる。さらには、
真空系の減圧弁や第２のパッドは、場合によって省略す
ることができる。The present invention is not limited to the above-described embodiment, and for example, the coating liquid is applied to each glass bulb one by one, and a plurality of suction pads are used to collectively cover a plurality of glass bulbs. It can also be applied. Further, as the coating liquid, not only one using an organic solvent but also one using a water-soluble binder can be used. In particular, when a coating liquid using a water-soluble binder is applied, a good coating film can be obtained because bubbles in the coating liquid can be effectively degassed in vacuum. Further, as the liquid level sensor, a light reflective type, a transmissive type, or the like can be used, or another sensor can be applied. Furthermore,
The vacuum pressure reducing valve and the second pad may be omitted in some cases.
【００２８】[0028]
【発明の効果】以上のように、本発明によれば、吸引パ
ッドにおける吸引孔の大きさ（孔径）は、バルブ内径の
１〜２５％の範囲に設定されているために、塗布液の液
面がガラスバルブの上端開口部の近辺にまで上昇して
も、液面での波打ち現象の発生を抑制できる。従って、
塗布膜の境界線が真直ぐに形成されて作業性，外観特性
を向上できるのみならず、軸方向の輝度分布にも好影響
を及ぼす。特に、その設定範囲が５〜２０％の場合に、
顕著である。As described above, according to the present invention, since the size (hole diameter) of the suction hole in the suction pad is set within the range of 1 to 25% of the valve inner diameter, the liquid of the coating liquid is used. Even if the surface rises to the vicinity of the upper end opening of the glass bulb, it is possible to suppress the occurrence of the waviness phenomenon on the liquid surface. Therefore,
The boundary line of the coating film is formed straight, so that not only the workability and appearance characteristics can be improved, but also the brightness distribution in the axial direction is positively affected. Especially when the setting range is 5 to 20%,
It is remarkable.
【００２９】又、ガラスバルブの上端側方には、液面セ
ンサが配置されているために、塗布液の液面が所定の高
さにまで到達すると、直ちに作動して真空系を遮断す
る。このために、液面高さを常に一定に維持できるのみ
ならず、塗布液の真空系への侵入をも防止できる。Further, since the liquid level sensor is arranged on the side of the upper end of the glass bulb, when the liquid level of the coating liquid reaches a predetermined height, it is activated immediately to shut off the vacuum system. For this reason, not only can the liquid level be maintained constant at all times, but it is also possible to prevent the coating liquid from entering the vacuum system.
【００３０】さらには、塗布液の粘度が５０〜２００ｃ
ｐｓに設定されているために、塗布膜の塗り肌がよい
上、ピ−リングの発生もなく、優れた外観特性が得られ
るのみならず、作業性も改善できる。Furthermore, the viscosity of the coating liquid is 50 to 200 c.
Since the coating film is set to ps, the coating film has a good coating surface, peeling does not occur, excellent appearance characteristics can be obtained, and workability can be improved.
【図１】本発明の１実施例を示す側断面図。FIG. 1 is a side sectional view showing an embodiment of the present invention.
【図２】塗布液を吸い上げた状態を示す側断面図。FIG. 2 is a side sectional view showing a state in which a coating liquid is sucked up.
【図３】吸い上げた塗布液が降下し塗布膜が形成された
状態を示す側断面図。FIG. 3 is a side cross-sectional view showing a state in which a sucked coating liquid is dropped and a coating film is formed.
【図４】発光層の形成状態を示す側断面図。FIG. 4 is a side sectional view showing a formation state of a light emitting layer.
【図５】従来の塗布ヘッドを用いた流し塗り方法を説明
するための側断面図。FIG. 5 is a side sectional view for explaining a flow coating method using a conventional coating head.
【図６】従来の吸い上げ塗布方法を説明するための側断
面図。FIG. 6 is a side sectional view for explaining a conventional wicking coating method.
１ ガラスバルブ １ａ 上端開口部 １ｂ 下端開口部 ２，３，４ 吸引パッド ３ａ，４ａ 吸引孔 ５ 真空経路 ６ 減圧弁 ７ 電磁弁 ８ 真空ポンプ ９ 液面センサ １０ 塗布液槽 １１ 塗布液 １１ａ 塗布膜 1 glass valve 1a upper end opening 1b lower end opening 2,3,4 suction pad 3a, 4a suction hole 5 vacuum path 6 pressure reducing valve 7 solenoid valve 8 vacuum pump 9 liquid level sensor 10 coating liquid tank 11 coating liquid 11a coating film
Claims (9)
ブを直立状態に支持する支持手段と、支持手段にて支持
されたガラスバルブの上端開口部に当接する吸引パッド
と、吸引パッドに接続した真空系と、ガラスバルブの下
端開口部が塗布液に浸漬されるように配置した塗布液槽
と、ガラスバルブ上端の側方に配置し、塗布液の液面が
所定高さになった時にそれの出力信号に基づいて真空系
を遮断する液面センサとを具備し、前記吸引パッドは、
真空系に連通する吸引孔を有し、その吸引孔の大きさを
ガラスバルブの内径の１〜２５％の範囲に設定したこと
を特徴とする塗布液の塗布装置。1. A support means for supporting a glass bulb having a bulb inner diameter of 2 to 10 mm in an upright state, a suction pad abutting against an upper end opening of the glass bulb supported by the support means, and a vacuum connected to the suction pad. The system, the coating liquid tank in which the lower end opening of the glass bulb is immersed in the coating liquid, and the coating liquid tank arranged beside the upper end of the glass bulb, when the liquid level of the coating liquid reaches a predetermined height. A liquid level sensor that shuts off the vacuum system based on the output signal, wherein the suction pad is
A coating liquid coating apparatus having a suction hole communicating with a vacuum system, wherein the size of the suction hole is set within a range of 1 to 25% of the inner diameter of the glass bulb.
をガラスバルブ内径の５〜２０％の範囲に設定したこと
を特徴とする請求項１記載の塗布液の塗布装置。2. The coating liquid coating apparatus according to claim 1, wherein the size of the suction hole in the suction pad is set in the range of 5 to 20% of the inner diameter of the glass bulb.
る部分を弾力性ないし柔軟性を有する部材にて構成した
ことを特徴とする請求項１記載の塗布液の塗布装置。3. The coating liquid coating apparatus according to claim 1, wherein a portion of the suction pad that comes into contact with the glass bulb is made of a member having elasticity or flexibility.
圧弁，電磁弁，真空ポンプにて構成したことを特徴とす
る請求項１記載の塗布液の塗布装置。4. The coating liquid coating apparatus according to claim 1, wherein the vacuum system comprises at least a vacuum path, a pressure reducing valve, a solenoid valve, and a vacuum pump.
号に基づいて制御されることを特徴とする請求項４記載
の塗布液の塗布装置。5. The coating liquid coating apparatus according to claim 4, wherein the solenoid valve is controlled based on a liquid level detection signal of a liquid level sensor.
ブを直立状態に支持する工程と、ガラスバルブの下端開
口部を粘度が５０〜２００ｃｐｓの塗布液に浸漬させる
工程と、ガラスバルブの上端開口部に、ガラスバルブ内
径の１〜２５％の範囲に設定された吸引孔を有する吸引
パッドを密接する工程と、吸引パッドを真空系に接続し
塗布液をガラスバルブの所定高さまで吸い上げた後、真
空系を遮断する工程とを含むことを特徴とする塗布液の
塗布方法。6. A step of supporting a glass bulb having an inner diameter of the bulb of 2 to 10 mm in an upright state, a step of immersing a lower end opening of the glass bulb in a coating liquid having a viscosity of 50 to 200 cps, and an upper end opening of the glass bulb. The step of closely adhering a suction pad having a suction hole set in the range of 1 to 25% of the inner diameter of the glass bulb, and connecting the suction pad to a vacuum system to suck up the coating liquid to a predetermined height of the glass bulb, and then vacuuming. And a step of shutting off the system.
をガラスバルブ内径の５〜２０％の範囲に設定したこと
を特徴とする請求項６記載の塗布液の塗布方法。7. The coating method according to claim 6, wherein the size of the suction hole in the suction pad is set within a range of 5 to 20% of the inner diameter of the glass bulb.
〜１０Ｋパスカルの範囲に設定したことを特徴とする請
求項６記載の塗布液の塗布方法。8. The degree of vacuum in the suction pad portion is 5
The coating liquid application method according to claim 6, wherein the coating liquid is set in a range from 10 KPascals to 10.
ンダ，溶剤を含むことを特徴とする請求項６記載の塗布
液の塗布方法。9. The coating method according to claim 6, wherein the coating liquid contains at least a phosphor, a binder and a solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9226795A JPH08281177A (en) | 1995-04-18 | 1995-04-18 | Method for applying coating liquid and apparatus therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9226795A JPH08281177A (en) | 1995-04-18 | 1995-04-18 | Method for applying coating liquid and apparatus therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08281177A true JPH08281177A (en) | 1996-10-29 |
Family
ID=14049630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9226795A Withdrawn JPH08281177A (en) | 1995-04-18 | 1995-04-18 | Method for applying coating liquid and apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08281177A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001314818A (en) * | 2000-03-23 | 2001-11-13 | Dmc 2 Degussa Metals Catalysts Cerdec Ag | Method for partially coating carrier |
| JP2004146102A (en) * | 2002-10-22 | 2004-05-20 | West Electric Co Ltd | Coating device of fluorescent liquid |
| KR100628735B1 (en) * | 2005-03-04 | 2006-09-29 | 주식회사 디엠에스 | a apparatus and a method for coating fluorescent layer |
-
1995
- 1995-04-18 JP JP9226795A patent/JPH08281177A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001314818A (en) * | 2000-03-23 | 2001-11-13 | Dmc 2 Degussa Metals Catalysts Cerdec Ag | Method for partially coating carrier |
| JP2004146102A (en) * | 2002-10-22 | 2004-05-20 | West Electric Co Ltd | Coating device of fluorescent liquid |
| KR100628735B1 (en) * | 2005-03-04 | 2006-09-29 | 주식회사 디엠에스 | a apparatus and a method for coating fluorescent layer |
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