JP2644821B2 - Manufacturing method of fluorescent lamp - Google Patents
Manufacturing method of fluorescent lampInfo
- Publication number
- JP2644821B2 JP2644821B2 JP11395288A JP11395288A JP2644821B2 JP 2644821 B2 JP2644821 B2 JP 2644821B2 JP 11395288 A JP11395288 A JP 11395288A JP 11395288 A JP11395288 A JP 11395288A JP 2644821 B2 JP2644821 B2 JP 2644821B2
- Authority
- JP
- Japan
- Prior art keywords
- glass tube
- fluorescent lamp
- roller
- tube
- manufacturing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、電球形蛍光ランプ装置の発光管として用い
られる蛍光ランプの製造方法に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fluorescent lamp used as an arc tube of a bulb-type fluorescent lamp device.
従来の技術 高効率、長寿命の蛍光ランプの寸法をコンパクト化
し、これを安定器、点灯管とともに一体化した電球形蛍
光ランプ装置が多く使用されるようになってきている。2. Description of the Related Art High-efficiency, long-life fluorescent lamps have been reduced in size, and light-bulb-type fluorescent lamp devices in which the fluorescent lamps are integrated with a ballast and a lighting tube have been increasingly used.
この蛍光ランプは通常３箇所の曲げ部を持つ折り返し
放電路構造になっている。その製造方法は、あらかじめ
Ｕ形に成形された第１曲げ部を有するガラス管の内面に
蛍光体膜を形成し、両端に電極を封止した後、管中央部
を軟化点温度以上に加熱した後、ローラに沿って180゜
曲げて第２曲げ部を形成し、他端から成形用気体を吹込
んで外側に膨脹させてダブルＵ形蛍光ランプを得るもの
である。このような製造方法によって作られたダブルＵ
形蛍光ランプは、きわめてコンパクトな寸法ながら光出
力が大きく、また製造も容易なことから、経済的にすぐ
れ、電球形蛍光ランプ装置の発光管に求められる特質を
数多く備えている。This fluorescent lamp usually has a folded discharge path structure having three bent portions. In the manufacturing method, a phosphor film is formed on the inner surface of a glass tube having a first bent portion formed in a U-shape in advance, and after sealing electrodes at both ends, the center of the tube is heated to a softening point temperature or higher. Thereafter, the second bent portion is formed by being bent 180 ° along the roller, and a molding gas is blown from the other end to expand outward, thereby obtaining a double U-shaped fluorescent lamp. Double U made by such a manufacturing method
Shaped fluorescent lamps are extremely compact in size, yet have high light output and are easy to manufacture, so they are economically excellent and have many characteristics required for the arc tube of a compact fluorescent lamp device.
発明が解決しようとする課題 しかし、製造過程で第２曲げ部がローラの外方向へ向
かって膨脹するために、その外周部分においてガラスが
著しく引き伸され肉厚が元の1/2以下にまで薄くなるこ
とがしばしば発生した。However, since the second bent portion expands in the outward direction of the roller during the manufacturing process, the glass is significantly stretched at the outer peripheral portion and the wall thickness is reduced to half or less of the original thickness. Thinning often occurred.
一般的に外径ａ（mm）なるガラス管を溝幅ｄ（mm）な
るローラに沿って曲げた場合、ガラス管の第２曲げ部は に伸びるので、その肉厚は初めの になる。いま、例えば、ａ＝15.5mm、ｄ＝20mmとする
と、この値は20/51＝0.4倍、すなわち計算値では初期の
40％の肉厚になり、発光管の機械的強度は弱くなる。ま
た、ガラス管内面に塗布されている蛍光体の膜厚も同じ
率で薄くなる。通常、蛍光体の膜厚は塗布量にして４〜
5mg/cm2が適正とされている。しかし上記の方法で曲げ
加工された部分の蛍光体は約2mg/cm2の膜厚となるの
で、動程中に紫外線照射により劣化変色して第２曲げ部
のみが部分的に黒化を起こし、ランプの寿命特性を低下
させるという欠点があった。通常、この種のコンパクト
形蛍光ランプは、高出力仕様で点灯されるのが普通であ
るが、特に電球形蛍光ランプ装置の場合は蛍光ランプが
グローブで密閉された高温雰囲気での点灯となるので、
この傾向が一層助長される。全放電路内に占める第２曲
げ部の比率は約35％もあり、この部分における蛍光体の
劣化変色は、ランプの寿命特性を大きく左右する重要な
問題であった。Generally, when a glass tube having an outer diameter a (mm) is bent along a roller having a groove width d (mm), the second bent portion of the glass tube is So the wall thickness is become. Now, for example, if a = 15.5 mm and d = 20 mm, this value is 20/51 = 0.4 times, that is, the calculated value is the initial value.
The thickness becomes 40%, and the mechanical strength of the arc tube becomes weak. Further, the thickness of the phosphor applied to the inner surface of the glass tube becomes thinner at the same rate. Usually, the thickness of the phosphor is 4 to
5 mg / cm 2 is considered appropriate. However, since the phosphor in the portion bent by the above method has a film thickness of about 2 mg / cm 2 , it deteriorates and discolors due to ultraviolet irradiation during the movement, and only the second bent portion is partially blackened. However, there is a disadvantage that the life characteristics of the lamp are deteriorated. Usually, this type of compact fluorescent lamp is lit with high output specifications, but especially in the case of a bulb-type fluorescent lamp device, the fluorescent lamp is lit in a high-temperature atmosphere sealed with gloves. ,
This tendency is further promoted. The ratio of the second bent portion in the entire discharge path is about 35%, and the deterioration and discoloration of the phosphor in this portion is an important problem that greatly affects the life characteristics of the lamp.
本発明の目的は、機械的強度が高く、安全性にすぐれ
ているとともに、ランプ動程中の光束減退を抑制するこ
とのできる蛍光ランプの製造方法を提供するものであ
る。An object of the present invention is to provide a method of manufacturing a fluorescent lamp which has high mechanical strength, is excellent in safety, and can suppress a decrease in luminous flux during the lamp movement.
課題を解決するための手段 本発明の蛍光ランプの製造方法は、Ｕ形ガラス管を、
ローラを用いて前記Ｕ形ガラス管の両端部が前記Ｕ形ガ
ラス管を含む平面と直角をなす方向に沿ってさらに折り
曲げられたダブルＵ形ガラス管を備えた蛍光ランプを製
造するに際し、前記ローラは、金属からなり、前記ガラ
ス管外径にほぼ等しい幅を有する２つの溝と、それぞれ
の溝の両側に設けられた側壁とを有し、前記ガラス管が
接触する側壁に複数個の微小な穴が設けられているもの
である。Means for Solving the Problems The fluorescent lamp manufacturing method of the present invention comprises:
When manufacturing a fluorescent lamp having a double U-shaped glass tube in which both ends of the U-shaped glass tube are further bent along a direction perpendicular to a plane including the U-shaped glass tube by using a roller, Is made of metal and has two grooves having a width substantially equal to the outer diameter of the glass tube, and side walls provided on both sides of each groove. A hole is provided.
作用 ガラス管を加熱して曲げる場合、そのローラの溝幅を
ガラス管外径にほぼ等しくすると、加工時に、ひしゃげ
の生じることがないので、ガラス管の両側中心線が伸長
せず、したがってガラス管外周の伸びは小さい。その伸
び率は になる。Action When the glass tube is heated and bent, if the groove width of the roller is approximately equal to the outer diameter of the glass tube, no whiskers will occur during processing, so the center lines on both sides of the glass tube do not extend, and therefore the glass tube Outer perimeter is small. The growth rate is become.
また、その製造工程においてはローラ材質の特性が重
要なポイントになる。特に熱伝導度は低い方が好まし
い。ガラス管は、軟化点温度以上にまで加熱され、その
管外径とほぼ等しい溝幅のローラ側壁に密着しつつ曲げ
加工される。その時、もしローラ材質の熱伝導度が大き
いと、ガラス管表面の温度が急激に冷却されることにな
り残留歪みが生じ、また場合によっては成形品の表面に
微小クラックが生じることもある。In the manufacturing process, the characteristics of the roller material are important. In particular, it is preferable that the thermal conductivity is low. The glass tube is heated to a temperature equal to or higher than the softening point temperature, and is bent while being closely attached to a roller side wall having a groove width substantially equal to the outer diameter of the tube. At that time, if the thermal conductivity of the roller material is large, the temperature of the surface of the glass tube is rapidly cooled to cause residual distortion, and in some cases, minute cracks may occur on the surface of the molded product.
発明者らは、このローラ材質について種々検討した結
果、鋳鉄等の金属材料を用い、その両側壁に複数個の微
小な穴を設けて、実質的な熱伝導度を下げることによ
り、この問題を解決することができることを見い出し
た。鋳鉄自体の熱伝導度は0.07〜0.11cal・cm-1sec-・d
eg-1と大きいものであるが、仮りにその表面積の50％を
穴の総面積で占めるとすれば、空気の熱伝導度6.81×10
-5cal・cm-1・sec-1・deg-1から考えて実質的な熱伝導
度をその値の1/2まで小さくすることができる。その結
果、ガラス管に残留歪や微小クラックの発生を防ぐこと
ができる。ローラのような加工治具は耐久性が要求され
るので、金属材料が最も適している。従来の方法ではガ
ラス管の第２曲げ部の肉厚が最初の1/2以下にまで薄く
なることが、しばしば生じて機械的強度も低かった。こ
れに対して、本発明の方法においては、ガラス管の第２
曲げ部の伸び率が、従来50％であったのに対し、15％か
ら20％までに抑えられるため、第２曲げ部の肉厚が十分
に保たれ機械的強度が高い。As a result of various studies on the material of the roller, the inventors have solved this problem by using a metal material such as cast iron and providing a plurality of minute holes on both side walls to substantially reduce the thermal conductivity. I found something that could be solved. Thermal conductivity of cast iron itself 0.07~0.11cal · cm -1 sec - · d
Although it is as large as eg- 1 , if the total area of the hole occupies 50% of its surface area, the thermal conductivity of air is 6.81 × 10
Considering -5 cal · cm -1 · sec -1 · deg -1 , the substantial thermal conductivity can be reduced to 1/2 of that value. As a result, it is possible to prevent the occurrence of residual strain and minute cracks in the glass tube. Since a processing jig such as a roller requires durability, a metal material is most suitable. In the conventional method, the thickness of the second bent portion of the glass tube is often reduced to 1/2 or less of the initial thickness, and the mechanical strength is low. On the other hand, in the method of the present invention, the second
Since the elongation percentage of the bent portion is reduced from 15% to 20%, compared with 50% in the past, the thickness of the second bent portion is sufficiently maintained and the mechanical strength is high.
実施例 以下、本発明の一実施例について図面を用いて説明す
る。Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
第１図はガラス管とローラとの寸法関係を説明するた
めの図であって、ローラを上方から見た図である。第１
図に示すように、ローラ１は曲げ径ｄを有する２つの溝
２と、それぞれの溝の両側に設けられた側壁３とを有し
ている。各々の溝２の幅ｂは、ガラス管４の外径ａとほ
ぼ等しい。側壁３には第２図に示すように、複数個の微
小な穴５が全面にわたって設けられている。この例で
は、穴４は側壁３を貫通しているが、必ずしも貫通して
いる必要はなく、要はガラス管４の第２曲げ部の形成の
際、ガラス管３が接触する側壁２の部分に穴を設けてあ
ればよい。FIG. 1 is a view for explaining a dimensional relationship between a glass tube and a roller, and is a view when the roller is viewed from above. First
As shown in the figure, the roller 1 has two grooves 2 having a bending diameter d and side walls 3 provided on both sides of each groove. The width b of each groove 2 is substantially equal to the outer diameter a of the glass tube 4. As shown in FIG. 2, the side wall 3 is provided with a plurality of minute holes 5 over the entire surface. In this example, the hole 4 penetrates the side wall 3, but it is not necessary to penetrate the hole 4, that is, the portion of the side wall 2 with which the glass tube 3 contacts when forming the second bent portion of the glass tube 4. It is sufficient if holes are provided in the holes.
このような装置を用いてダブルＵ形蛍光ランプを作
り、これを電球形蛍光ランプ装置の発光管に適用した具
体例を次に説明する。A specific example in which a double U-type fluorescent lamp is manufactured using such a device and applied to an arc tube of a bulb-type fluorescent lamp device will be described below.
いま、外径ａが15.5mm、肉厚t1が1.0mmで、内面に蛍
光体が塗布されたＵ形ガラス管の両端に電極を封止した
後、溝幅ｂが15.5mm、曲げ径ｄが20mmで側壁に各々1cm2
当たり直径1.0mmの穴を10個有する鋳鉄製ローラを用い
て、電極間距離280mmを有するダブルＵ形ガラス管を得
た。前記蛍光体は、ユーロピウム付活二酸化イットリウ
ムとテルビウム付活アルミン酸セリウムマグネシウムと
の混合蛍光体を用いた。このような蛍光ランプの第２曲
げ部の伸び率を示すガラス肉厚t2は0.85mmと穴なしの真
ちゅう製ローラを用いた従来方法による曲げ部の伸び率
0.5mmに比して、大幅に改良されることが認められた。Now, an outer diameter a is 15.5 mm, the thickness t 1 is at 1.0 mm, after the phosphor sealing the electrodes on both ends of the U-shaped glass tubes coated on the inner surface, the groove width b is 15.5 mm, the bending diameter d Is 20mm and each side wall is 1cm 2
A double U-shaped glass tube having a distance between electrodes of 280 mm was obtained using a cast iron roller having 10 holes with a diameter of 1.0 mm per hole. As the phosphor, a mixed phosphor of europium-activated yttrium dioxide and terbium-activated cerium magnesium aluminate was used. Elongation of the second bent portion of the glass wall thickness t 2 which indicates the elongation portion bent by the conventional method using a brass roller without 0.85mm and holes of such a fluorescent lamp
It was recognized that it was greatly improved compared to 0.5 mm.
次に、ダブルＵ形ガラス管内を排気し、その中にアル
ゴン400Paと6mgの水銀を封入し、排気細管内にビスマス
−インジウム合金200mgを設けて第３図に示すようなダ
ブルＵ形蛍光ランプを得た。このランプを発光管として
安定器、点灯管とともに、電球口金を取り付けた密閉外
管内に組み込んで、定格電流300mAの電球形蛍光ランプ
装置を製作し、これを点灯して試験したところ、寿命中
の光束維持率は下表に示すとおりの結果となった。な
お、同表には従来の方法によって得られた同一仕様の電
球形蛍光ランプ装置の光束維持率も併せて示す。Next, the inside of the double U-shaped glass tube was evacuated, 400 Pa of argon and 6 mg of mercury were sealed therein, and 200 mg of a bismuth-indium alloy was provided in the exhaust narrow tube to form a double U-shaped fluorescent lamp as shown in FIG. Obtained. This lamp was used as an arc tube together with a ballast and a lighting tube in a sealed outer tube equipped with a light bulb base to produce a light bulb-type fluorescent lamp device with a rated current of 300 mA. The luminous flux maintenance ratio of the results shown in the table below. The table also shows the luminous flux maintenance ratio of the compact fluorescent lamp device of the same specification obtained by the conventional method.
上表から明らかなように、本発明の方法により得られ
た電球形蛍光ランプ装置は、従来の方法により得られた
ものに比して、光束維持率の低下が抑制されていること
がわかる。また、平均寿命の6000時間点灯後も、前者は
後者に見られた第２曲げ部の蛍光体の劣化による変色も
きわめて軽度であることが認められた。 As is apparent from the above table, the bulb-type fluorescent lamp device obtained by the method of the present invention suppresses a decrease in the luminous flux maintenance factor as compared with that obtained by the conventional method. In addition, even after lighting for an average life of 6000 hours, the former was found to be extremely mild in discoloration due to the deterioration of the phosphor in the second bent portion, which was observed in the latter.
発明の効果 以上説明したように、本発明蛍光ランプの製造方法
は、Ｕ形ガラス管を、ローラを用いてその両端部が前記
Ｕ形ガラス管を含む平面と直角をなす方向に沿ってさら
に折り曲げられたダブルＵ形ガラス管を備えた蛍光ラン
プを製造するに際し、前記ローラの材質として金属を用
い、その溝幅をガラス管の外径とほぼ等しく、かつその
側壁に微小な穴を複数個設けたことにより、ローラ材質
は工業的に十分耐久性に富み、かつガラス管の第２曲げ
部の伸び率を大幅に抑えることができる。したがって、
本発明の方法によって得られた蛍光ランプを安定器，点
灯管とともに、電球口金を取付けた密閉外管内に一体化
して電球形蛍光ランプ装置とした場合、ランプの寿命を
通じて曲げ部の蛍光体の劣化，変色をきわめて軽度に抑
えることができるので、光束維持率を高いレベルに保つ
ことができる。また、曲げ加工時の伸びを抑制するとが
できるため、曲げ部の肉厚も十分に保つことができ、機
械的強度が高く安全性にすぐれたものとなる。Effect of the Invention As described above, the method of manufacturing the fluorescent lamp of the present invention further comprises bending the U-shaped glass tube using a roller in a direction in which both ends thereof are perpendicular to the plane including the U-shaped glass tube. When manufacturing a fluorescent lamp having a double U-shaped glass tube, a metal is used as the material of the roller, the groove width is substantially equal to the outer diameter of the glass tube, and a plurality of minute holes are provided in the side wall thereof. As a result, the roller material is industrially sufficiently durable, and the elongation rate of the second bent portion of the glass tube can be significantly suppressed. Therefore,
When the fluorescent lamp obtained by the method of the present invention, together with a ballast and a lighting tube, is integrated into a sealed outer tube having a bulb base attached thereto to form a bulb-type fluorescent lamp device, the fluorescent material in the bent portion is used throughout the life of the lamp. Since deterioration and discoloration can be suppressed to a very low level, the luminous flux maintenance ratio can be maintained at a high level. Further, since the elongation during bending can be suppressed, the thickness of the bent portion can be sufficiently maintained, and the mechanical strength is high and the safety is excellent.
第１図はガラス管とローラとの寸法関係を説明するため
の図、第２図は第１図のII−II線に沿って切断した断面
図、第３図は本発明の方法によって得られたダブルＵ形
蛍光ランプの一部切欠側面図である。 １……ローラ、２……ローラの側壁、３……ローラの
溝、４……ガラス管、５……穴、ａ……ガラス管の外
径、ｂ……ローラの溝の幅、ｄ……ローラの曲げ径、t1
……ガラス管の直管部の肉厚、t2……第２曲げ部の肉
厚。1 is a view for explaining a dimensional relationship between a glass tube and a roller, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is obtained by the method of the present invention. It is a partially cutaway side view of the double U-type fluorescent lamp. 1 ... roller, 2 ... roller side wall, 3 ... roller groove, 4 ... glass tube, 5 ... hole, a ... outer diameter of glass tube, b ... width of roller groove, d ... … Roller bending diameter, t 1
... The thickness of the straight tube portion of the glass tube, t 2 ... The thickness of the second bent portion.
Claims (1)
ガラス管の両端部が前記Ｕ形ガラス管を含む平面と直角
をなす方向に沿ってさらに折り曲げられたダブルＵ形ガ
ラス管を備えた蛍光ランプを製造するに際し、前記ロー
ラは、金属からなり、前記ガラス管外径にほぼ等しい幅
を有する２つの溝と、それぞれの溝の両側に設けられた
側壁とを有し、前記ガラス管が接触する側壁に複数個の
微小な穴が設けられていることを特徴とする蛍光ランプ
の製造方法。1. A double U-shaped glass tube in which both ends of the U-shaped glass tube are further bent along a direction perpendicular to a plane including the U-shaped glass tube by using a roller. In manufacturing the fluorescent lamp provided with the glass, the roller has two grooves having a width substantially equal to the outer diameter of the glass tube, and side walls provided on both sides of each groove. A method for manufacturing a fluorescent lamp, wherein a plurality of minute holes are provided in a side wall with which a tube contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11395288A JP2644821B2 (en) | 1988-05-11 | 1988-05-11 | Manufacturing method of fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11395288A JP2644821B2 (en) | 1988-05-11 | 1988-05-11 | Manufacturing method of fluorescent lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01283741A JPH01283741A (en) | 1989-11-15 |
| JP2644821B2 true JP2644821B2 (en) | 1997-08-25 |
Family
ID=14625320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11395288A Expired - Fee Related JP2644821B2 (en) | 1988-05-11 | 1988-05-11 | Manufacturing method of fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2644821B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4956224B2 (en) * | 2007-02-23 | 2012-06-20 | パナソニック株式会社 | Manufacturing method of electrodeless discharge lamp, electrodeless discharge lamp manufactured by the manufacturing method, and lighting fixture using the electrodeless discharge lamp |
-
1988
- 1988-05-11 JP JP11395288A patent/JP2644821B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01283741A (en) | 1989-11-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |