JPH02297834A - Manufacture of direct heated cathode - Google Patents
Manufacture of direct heated cathodeInfo
- Publication number
- JPH02297834A JPH02297834A JP11504789A JP11504789A JPH02297834A JP H02297834 A JPH02297834 A JP H02297834A JP 11504789 A JP11504789 A JP 11504789A JP 11504789 A JP11504789 A JP 11504789A JP H02297834 A JPH02297834 A JP H02297834A
- Authority
- JP
- Japan
- Prior art keywords
- core wire
- electrode
- electrodeposition
- electrodeposited
- spool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000004070 electrodeposition Methods 0.000 claims abstract description 37
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 13
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract description 13
- 239000002245 particle Substances 0.000 abstract description 12
- 239000011248 coating agent Substances 0.000 abstract description 8
- 238000000576 coating method Methods 0.000 abstract description 8
- 230000006866 deterioration Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 6
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- LEDMRZGFZIAGGB-UHFFFAOYSA-L strontium carbonate Chemical compound [Sr+2].[O-]C([O-])=O LEDMRZGFZIAGGB-UHFFFAOYSA-L 0.000 description 2
- 229910000018 strontium carbonate Inorganic materials 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は蛍光表示管等の直熱型線状カソードとして用い
られる直熱量カソードの製造方法に係わシ、特にタング
ステン尋の高融点金属芯線上にＢａＣＯ３、ＳｒＣＯ３
、ＣａＣＯ３等のアルカリ土類炭酸塩を電気泳動的にコ
ーティングする電着方法に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a directly heated linear cathode used as a directly heated linear cathode for a fluorescent display tube, etc. BaCO3, SrCO3 on the line
, relates to an electrodeposition method for electrophoretically coating an alkaline earth carbonate such as CaCO3.
従来、この種の電着方法は、ＢａＣＯ３、ＳｒＣＯ３。 Conventionally, this type of electrodeposition method uses BaCO3, SrCO3.
ＣａＣ０１等のアルカリ土類炭酸塩もしくはこれらの混
合物、固溶体等を適当な大きさ、例えば通常径Ｏ２１〜
２．０μｍ程度に粉砕し、これと結合剤となる有機バイ
ンダを適当なる有機溶剤に懸濁させて電着液を作製し、
この電着液内に高融点金属芯線として例えば直径５〜２
０μｍのタングステン芯線と対極となる電極とを浸漬し
、１０〜５ｏｏｖ程度の直流電圧を印加してタングステ
ン芯線上にアルカリ土類炭酸塩を電気泳動的にコーティ
ングするいわゆる電着を行なう。この場合、第４図に示
すように電着液１内において、対向電極２として円筒電
極または板状電極（図示しない）内にタングステン芯線
３を挿通し、この対向電極２を陽極とし、タングステン
芯線３を陰極として電着を行なう。なお、電着を有効に
行なうために電解質、界面活性剤等を加えることもある
。Alkaline earth carbonates such as CaC01 or mixtures thereof, solid solutions, etc., are prepared in an appropriate size, for example, a normal diameter of O21~
Grind it to about 2.0 μm and suspend it and an organic binder as a binder in a suitable organic solvent to prepare an electrodeposition solution.
In this electrodeposition solution, a high melting point metal core wire is placed, for example, with a diameter of 5 to 2 mm.
A 0 μm tungsten core wire and a counter electrode are immersed, and a DC voltage of about 10 to 5 oov is applied to electrophoretically coat the alkaline earth carbonate onto the tungsten core wire, so-called electrodeposition. In this case, as shown in FIG. 4, a tungsten core wire 3 is inserted into a cylindrical electrode or a plate electrode (not shown) as a counter electrode 2 in the electrodeposition solution 1, and the counter electrode 2 is used as an anode. Electrodeposition is performed using No. 3 as a cathode. Incidentally, an electrolyte, a surfactant, etc. may be added in order to perform electrodeposition effectively.
しかしながら、前述したような電着方法によると、対向
電極２として円筒電極または板状電極を用いているので
、電着液１の対流が妨げられ、電着とともに電着液１の
濃度が薄くかつ不均一となシ、この結果、電着時間の経
過とともに電着効率が低下し、かつコーティングも不均
一となシ、長時間の電着が不可能であった。また、この
ような問題を改善するためには電着液１の攪拌速度を高
めるとか対向電極２を一方側のみに配置するなどの工夫
がなされたが、前者の方法によると、電気泳動の流れが
乱され、コーティングが不均一となシ、後者の方法では
断面方向が均一な円形でなくなる等の問題があり、この
点での改善が望まれていた。However, according to the electrodeposition method described above, since a cylindrical electrode or a plate-shaped electrode is used as the counter electrode 2, the convection of the electrodeposition liquid 1 is hindered, and the concentration of the electrodeposition liquid 1 becomes thin and thin during electrodeposition. As a result, the electrodeposition efficiency decreased as the electrodeposition time progressed, and the coating was also uneven, making it impossible to perform electrodeposition for a long time. In addition, in order to improve such problems, measures have been taken to increase the stirring speed of the electrodeposition solution 1 and to arrange the counter electrode 2 only on one side, but according to the former method, the flow of electrophoresis There are problems such as the coating being disturbed and the coating being non-uniform, and the latter method having problems such as the cross-sectional direction not being uniformly circular, and improvements in this respect have been desired.
したがって、本発明による直熱屋カソードの製造方法は
、前述した従来の問題を解決するためになされたもので
あシ、電着中の経時変化を極力少なくし、長時間にわた
って電着を行なっても電着効率の低下が少なく、均一な
コーティングが確保される直熱盟カソードの製造方法を
提供すること金目的としている。Therefore, the method for manufacturing a directly heated cathode according to the present invention has been made to solve the above-mentioned conventional problems, and it is possible to minimize changes over time during electrodeposition and perform electrodeposition over a long period of time. Another object of the present invention is to provide a method for manufacturing a direct heating layer cathode, which reduces electrodeposition efficiency and ensures uniform coating.
本発明の直熱型カソードの製造方法は、高融点金属芯線
に対する対向電極として最***径０．５露φ以上の開口
部を面積比で開口率３０％以上９０チ未満を有する穴あ
き状電極を用いるものである。The method for manufacturing a directly heated cathode of the present invention provides a perforated electrode having an opening area ratio of 30% or more and less than 90 mm in area ratio, with an opening having a minimum hole diameter of 0.5 mm or more as a counter electrode to a high melting point metal core wire. is used.
本発明においては、穴あき状電極を用いることによシ、
電着液の対流が促進されるとともに粒径０．１〜２．０
μｍφのアルカリ土類炭酸塩の粒子が開口部内を速やか
に流通され、濃度が均一化される。In the present invention, by using a perforated electrode,
The convection of the electrodeposition liquid is promoted and the particle size is 0.1 to 2.0.
Particles of alkaline earth carbonate having a size of μmφ are rapidly passed through the opening, and the concentration is made uniform.
ここで、最***径を０．５１φ以上と限定したのは、こ
れ以下では粒子の流通が速やかでないからであシ、開口
部の面積比ｔ−３ｃ１以上９（１未満と限定したのは、
３０％未満では粒子の流通が速やかでなく、９０％を超
えると電極の強度が不十分になるからである。Here, the reason why the minimum hole diameter was limited to 0.51φ or more is because particles do not flow quickly if it is smaller than this.
If it is less than 30%, the particles will not flow quickly, and if it exceeds 90%, the strength of the electrode will be insufficient.
以下、図面を用いて本発明の実施例を詳細に説明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明による直熱型カソードの製造方法の一実
施例を説明するための電着装置の構成を示す断面図であ
シ、前述の図と同一部分には同一符号を付しである。同
図において、４は電着液１を収容する電着槽、５は電着
液１内に配置されたタングステン芯線３の方向転換スプ
ール、６はタングステン芯線３が巻き込まれている芯線
スプール、Ｔはタングステン芯線３に陽極電圧を印加す
る通電スプール、８は対向電極として第２図に示すよう
に最***径０．５１φ以上の、開口部８ａが面積比で３
０％以上９０％未満の割合で形成され丸穴あき状円筒電
極であり、この穴あき状円筒電極８は、例えばパンチン
グメタルを円筒状に成形して形成されている。９は穴あ
き状円筒電極８内を挿通することによシタングステン芯
線３上にアルカリ土類炭酸塩粒子が電着された電着線、
１０は電着線９ｔ−巻き取る巻き取りスプールである。FIG. 1 is a cross-sectional view showing the structure of an electrodeposition apparatus for explaining an embodiment of the method for manufacturing a directly heated cathode according to the present invention, and the same parts as in the previous drawings are denoted by the same reference numerals. be. In the figure, reference numeral 4 denotes an electrodeposition tank containing the electrodeposition liquid 1, 5 a spool for changing the direction of the tungsten core wire 3 placed in the electrodeposition liquid 1, 6 a core wire spool around which the tungsten core wire 3 is wound, and T. 8 is a current-carrying spool that applies an anode voltage to the tungsten core wire 3, and 8 is a counter electrode.As shown in FIG.
It is a cylindrical electrode with round holes formed at a ratio of 0% or more and less than 90%, and this cylindrical electrode 8 with holes is formed, for example, by molding punched metal into a cylindrical shape. 9 is an electrodeposited wire in which alkaline earth carbonate particles are electrodeposited on the tungsten core wire 3 by passing through the perforated cylindrical electrode 8;
10 is a take-up spool for winding up the electrodeposited wire 9t.
このような構成において、芯線スプール６に巻き込まれ
ているタングステン芯線３は、巻き塩シスプール１Ｇの
回動力により矢印入方向に一定の速度で引張られること
によシ供給され、通電スプール７と接触して陰極電圧が
印加されるとともに電着液１内に浸漬され、方向転換ス
プール５によ多方向転換されて陽極電圧が印加され友人
あき状円筒電極８内を挿通することによシこのタングス
テン芯線３上にアルカリ土類炭酸塩粒子が電気泳動的に
電着されて電着線９が形成され、巻き取υスプール１０
に巻き取られて完成される。この場合、タングステン芯
線３が挿通する穴あき状円筒電極８には、第２図に示し
たように最***径０，５ｍｍφ以上の開口部８ａが面積
比で３０％以上９０チ未満の割合で有しているので、電
着液１の通常の攪拌によシ対流が促進されるとともに粒
径０．１〜２．０μｍのアルカリ土類炭酸塩の粒子がそ
れらの開口部８ａ内を速やかに流通するので、電着液１
の濃度が均一化されて膜厚の均一なコーティングが効率
良〈実施される。In such a configuration, the tungsten core wire 3 wound around the core wire spool 6 is supplied by being pulled at a constant speed in the direction of the arrow by the rotational force of the wound salt spool 1G, and is brought into contact with the current-carrying spool 7. A cathode voltage is applied thereto, and the tungsten core wire is immersed in the electrodepositing solution 1, changed in multiple directions by the direction changing spool 5, an anode voltage is applied, and then inserted through the perforated cylindrical electrode 8. 3, alkaline earth carbonate particles are electrophoretically deposited to form an electrodeposited wire 9, and a take-up υ spool 10 is formed.
It is wound up and completed. In this case, the perforated cylindrical electrode 8 through which the tungsten core wire 3 is inserted has an opening 8a with a minimum hole diameter of 0.5 mmφ or more in an area ratio of 30% or more but less than 90 mm, as shown in FIG. As a result, convection is promoted by normal stirring of the electrodeposition solution 1, and alkaline earth carbonate particles with a particle size of 0.1 to 2.0 μm quickly move inside the openings 8a. Since it is distributed, electrodeposition liquid 1
The concentration of the coating is made uniform, and coating with a uniform thickness is efficiently carried out.
第３図（、） 、 （ｂ）は本発明に係わる対向電極の
他の実施例を示したものであり、同図（、）は側面から
見た平面図、同図Φ）は同図（＆）のＢ−Ｂ’線断面図
である。同図において、この対向電極として最***径０
．５ ｗａ口口上上開口部８１が面積比で７０％以上の
割合で形成された第１の平行平板電極８Ａと第２の平行
平板電極８Ｂとを対向させて図示されないが電気的に接
続して組み合わせた穴あき状平行平板電極８′を用いる
。この穴あき状平行平板電極８′は、例えばエキスバン
ドメタルを適当な大きさに切断し、電気的に接続するこ
とにより容易に形成される。Figures 3(,) and 3(b) show other embodiments of the counter electrode according to the present invention, where (,) is a plan view seen from the side, and Φ) is a plan view of the opposite electrode according to the present invention. &) is a sectional view taken along line BB'. In the same figure, the minimum hole diameter is 0 for this counter electrode.
．． Although not shown in the drawings, the first parallel plate electrode 8A and the second parallel plate electrode 8B, in which the upper opening 81 of the upper opening 81 is formed in an area ratio of 70% or more, are opposed and electrically connected. A combination of perforated parallel plate electrodes 8' is used. This perforated parallel plate electrode 8' can be easily formed, for example, by cutting expanded metal into an appropriate size and electrically connecting it.
このように構成される穴あき状平行平板電極８′を用い
ることにより、タングステン芯線３上に電着されるアル
カリ土類炭酸塩層の断面を完全な円形状とするには第２
図の円筒電極８の構成が好ましいが、この平行平板電極
８′でもタングステン芯線３の線径に対して第１の平行
平板電極８人および第２の平行平板電極８Ｂの対向面積
を大きくすれば、電場は十分に平行平板電極８Ａ、８Ｂ
の存在しない側にも回り込み、実用上支障のない断面の
円形状程度が得られる。By using the perforated parallel plate electrodes 8' configured in this manner, it is possible to make the cross section of the alkaline earth carbonate layer electrodeposited on the tungsten core wire 3 into a perfect circular shape.
Although the structure of the cylindrical electrode 8 shown in the figure is preferable, even in this parallel plate electrode 8', it is possible to increase the opposing area of the first eight parallel plate electrodes and the second parallel plate electrode 8B with respect to the wire diameter of the tungsten core wire 3. , the electric field is sufficiently parallel plate electrodes 8A, 8B
It also wraps around to the side where there is no , and a circular cross-section that does not pose any practical problem can be obtained.
下記表１は、対向電極としての電極形状を円筒状または
平板状に形成し九場合における開口部のない従来例およ
び開口部を有する本実施例について実施した実験結果を
示したものである。Table 1 below shows the results of experiments conducted on a conventional example without an opening and a present example with an opening, in which the electrode shape as the counter electrode was formed into a cylindrical or flat plate shape.
表１
上記表１から明らかなように本実施例によれば、１回の
均−電着長さを従来例の２〜３倍程度まで延ばすことが
でき、かつ電着状態も均一で良好なものが得られ、さら
に電着効率も従来例の２〜３倍程度まで向上させること
ができる。Table 1 As is clear from Table 1 above, according to this example, the length of one uniform electrodeposition can be extended to about 2 to 3 times that of the conventional example, and the electrodeposition condition is also uniform and good. Furthermore, the electrodeposition efficiency can be improved to about 2 to 3 times that of the conventional example.
以上説明したように本発明は、高融点金属芯線にアルカ
リ土類炭酸塩粒子を電着させる対向電極として最***径
０．５ｍｍφ以上の開口部を面積比で開口率３０チ以上
９０％未満の割合で有する穴あき状電極を用いることに
より、電着液の対流が促進されるとともに開口部内をア
ルカリ土類炭酸塩の粒子が速やかに流通されるので、均
−電着長さが大幅に延長できるとともに均一で良好な電
着状態が維持でき、さらに電着効率も大幅に向上できる
等の極めて優れた効果が得られる。As explained above, the present invention provides an opening with a minimum hole diameter of 0.5 mmφ or more as a counter electrode for electrodepositing alkaline earth carbonate particles on a high melting point metal core wire, with an area ratio of 30 mm or more and less than 90%. By using a perforated electrode, the convection of the electrodeposited liquid is promoted, and the alkaline earth carbonate particles are quickly circulated through the openings, which greatly extends the uniform electrodeposition length. At the same time, it is possible to maintain a uniform and good electrodeposition state, and furthermore, the electrodeposition efficiency can be greatly improved, and other extremely excellent effects can be obtained.
第１図は本発明による直熱型カソードの製造方法の一実
施例を説明するための電着装置の構成を示す断面図、第
２図（＆） 、 （ｂ）は本発明に係わる対向電極の一
実施例を示す穴あき状円筒電極の側面から見た平面図、
そのＢ−Ｂ’線断面図、第３図（ａ）。
伽）は本発明に係わる対向電極の他の実施例を示す穴あ
き状平行平板電極の側面から見た平面図、そのＢ−Ｂ’
線断面図、第４図（ａ） 、 （ｂ）は従来の対向電極
の一例を示す側面から見た平面図、そのＢ−Ｂ’線断面
図である。
１・・・・電着液、３・・・−タングステン芯線、４・
・・・電着槽、５・・・・方向転換スプール、６・・・
・芯線スプール、Ｔ・・・・通電スプール、８・・・・
穴あき状円筒電極、８′・・・・穴あき状平行平板電極
、８Ａ・・・・第１の平行平板電極、８Ｂ・・・・第２
の平行平板電極、８ａ ・・・・開口部、９・・・・電
着線、１０・・・・巻き取シスプール。
特許出願人 伊勢電子工業株式会社
九州ノリタケ株式会社FIG. 1 is a cross-sectional view showing the configuration of an electrodeposition apparatus for explaining an embodiment of the method for manufacturing a directly heated cathode according to the present invention, and FIG. 2 (&) and (b) are counter electrodes according to the present invention. A plan view seen from the side of a perforated cylindrical electrode showing an example of
A cross-sectional view taken along the line BB', FIG. 3(a).佽) is a plan view of a perforated parallel plate electrode seen from the side showing another embodiment of the counter electrode according to the present invention;
4(a) and 4(b) are a plan view showing an example of a conventional counter electrode as seen from the side, and a sectional view taken along the line BB' thereof. 1...electrodeposition liquid, 3...-tungsten core wire, 4...
...electrodeposition tank, 5...direction change spool, 6...
・Core wire spool, T... energizing spool, 8...
Perforated cylindrical electrode, 8'... Perforated parallel plate electrode, 8A... First parallel plate electrode, 8B... Second
Parallel plate electrodes, 8a...opening, 9...electrodeposited wire, 10...winding syspool. Patent applicant: Ise Electronics Industry Co., Ltd. Kyushu Noritake Co., Ltd.
Claims (1)
線を対向電極間に挿通させて浸漬し、該高融点金属芯線
と該対向電極との間に直流電圧を印加することにより該
高融点金属芯線上にアルカリ土類炭酸塩を電着させる直
熱型カソードの製造方法において、前記対向電極は最小
穴径０．５ｍｍφ以上の開口部が面積比で開口率３０％
以上９０％未満の割合で有する穴あき状電極を用いるこ
とを特徴とした直熱型カソードの製造方法。A high melting point metal core wire is inserted between opposing electrodes and immersed in an electrodeposition solution containing an alkaline earth carbonate, and a DC voltage is applied between the high melting point metal core wire and the opposing electrode. In a method for manufacturing a directly heated cathode in which alkaline earth carbonate is electrodeposited on a melting point metal core wire, the counter electrode has an opening with a minimum hole diameter of 0.5 mmφ or more with an area ratio of 30%.
A method for producing a directly heated cathode, characterized in that a perforated electrode having a ratio of at least 90% is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1115047A JP2767280B2 (en) | 1989-05-10 | 1989-05-10 | Manufacturing method of direct heat type cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1115047A JP2767280B2 (en) | 1989-05-10 | 1989-05-10 | Manufacturing method of direct heat type cathode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02297834A true JPH02297834A (en) | 1990-12-10 |
| JP2767280B2 JP2767280B2 (en) | 1998-06-18 |
Family
ID=14652870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1115047A Expired - Lifetime JP2767280B2 (en) | 1989-05-10 | 1989-05-10 | Manufacturing method of direct heat type cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2767280B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4910521U (en) * | 1972-04-26 | 1974-01-29 | ||
| JPS5055885A (en) * | 1973-09-17 | 1975-05-16 | ||
| JPS6063848A (en) * | 1983-09-17 | 1985-04-12 | Futaba Corp | Manufacture of oxide hot cathode |
-
1989
- 1989-05-10 JP JP1115047A patent/JP2767280B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4910521U (en) * | 1972-04-26 | 1974-01-29 | ||
| JPS5055885A (en) * | 1973-09-17 | 1975-05-16 | ||
| JPS6063848A (en) * | 1983-09-17 | 1985-04-12 | Futaba Corp | Manufacture of oxide hot cathode |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2767280B2 (en) | 1998-06-18 |
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