JPH0138341B2 - - Google Patents
Info
- Publication number
- JPH0138341B2 JPH0138341B2 JP4591281A JP4591281A JPH0138341B2 JP H0138341 B2 JPH0138341 B2 JP H0138341B2 JP 4591281 A JP4591281 A JP 4591281A JP 4591281 A JP4591281 A JP 4591281A JP H0138341 B2 JPH0138341 B2 JP H0138341B2
- Authority
- JP
- Japan
- Prior art keywords
- flare
- valve
- straight pipe
- glass
- tip
- 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
Links
- 239000005355 lead glass Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 17
- 238000005452 bending Methods 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 description 8
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 7
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 239000006063 cullet Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/26—Sealing together parts of vessels
- H01J9/265—Sealing together parts of vessels specially adapted for gas-discharge tubes or lamps
- H01J9/266—Sealing together parts of vessels specially adapted for gas-discharge tubes or lamps specially adapted for gas-discharge lamps
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Description
【発明の詳細な説明】
この発明は環形蛍光ランプ、特にソーダガラス
或は低鉛ガラスの直管形バルブに鉛ガラスのステ
ムマウントを封止して、直管形バルブを環形に曲
げ加工する製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION This invention relates to an annular fluorescent lamp, particularly a straight tube bulb made of soda glass or low-lead glass, which is sealed with a stem mount made of lead glass, and the straight tube bulb is bent into an annular shape. It is about the method.
環形蛍光ランプの製造工程を大別すると直管形
バルブの開口端にステムマウントのフレア先端部
をドロツプシール法等で封止する工程、フレアを
封止した直管形バルブの端部外周面に後の曲げ工
程でチヤツクできるように円周方向に沿つて凹部
を形成する工程、直管形バルブの凹部をチヤツク
して直管形バルブを環形に曲げ加工する工程があ
る。また前記ステムマウントはガラスチユーブの
一端部を加熱して円錐形に外に拡げてから、ガラ
スチユーブを所定の長さのところで切断してフレ
アを形成し、このフレア内に排気管とリード線を
位置決め挿入しておいて、フレアと排気管を溶着
してリード線を封止したステムを形成し、更にス
テムから突出するリード線の先端部にフイラメン
トをマウントすることにより製造される。このス
テムマウントと直管形バルブの封止は直管形バル
ブの端部内にステムマウントを挿入し、直管形バ
ルブの端部とステムマウントのフレアの先端部を
炎で局部的に加熱して溶融させることにより、直
管形バルブの端部とフレアの先端部を溶着させて
行つている。また直管形バルブ端部の凹部形成は
バルブ端部を加熱して軟化させておいて、この端
部を金型に入れ、バルブ内に高圧ガスを送り込ん
でバルブ端部を金型に押し付けることにより行つ
ている。更に直管形バルブの環形にする曲げ加工
はバルブ全体を加熱炉内で加熱して軟化させてお
いて、一端部からローラを使つて巻き上げること
により行つている。 The manufacturing process for annular fluorescent lamps can be roughly divided into two: a process in which the flare tip of the stem mount is sealed on the open end of the straight tube bulb using a drop seal method, and a process in which the flare tip is sealed on the outer peripheral surface of the end of the straight tube bulb with the flare sealed. There is a step of forming a recess along the circumference so that it can be checked during the bending process, and a step of checking the recess of the straight pipe valve and bending the straight pipe valve into an annular shape. The stem mount heats one end of the glass tube to expand it outward into a conical shape, then cuts the glass tube at a predetermined length to form a flare, and inserts the exhaust pipe and lead wire into the flare. It is manufactured by positioning and inserting, welding the flare and exhaust pipe to form a stem with a sealed lead wire, and then mounting a filament on the tip of the lead wire protruding from the stem. This stem mount and straight pipe valve are sealed by inserting the stem mount into the end of the straight pipe valve and locally heating the end of the straight pipe valve and the flare tip of the stem mount with a flame. By melting, the end of the straight pipe valve and the tip of the flare are welded together. In addition, to form a recess at the end of a straight pipe valve, heat the end of the valve to soften it, place this end in a mold, and send high-pressure gas into the valve to press the end of the valve against the mold. It is going by. Further, bending of a straight pipe valve into an annular shape is carried out by heating the entire valve in a heating furnace to soften it, and then rolling it up from one end using rollers.
ところで、直管形バルブは鉛ガラスに比べて非
常に安価であるソーダガラスが使用され、ステム
マウントのフレアは高価であるが加工性が良い鉛
ガラスを使用する傾向にある。このように直管形
バルブとフレアの材料が異なると自ずとその軟化
点が異なり、そのため、特に上記直管形バルブの
環形曲げ加工時に次のことを注意する必要があ
る。即ち、直管形バルブのソーダガラスの軟化点
は約700℃であり、フレアの鉛ガラスの軟化点は
約615℃と両者間に大きな差があるため、フレア
を封止した直管形バルブ全体を軟化させるまで加
熱すると、直管形バルブが軟化する前にフレアが
軟化し、このフレアは軟化点以上に加熱される。
そのため、フレアと直管形バルブとの封止部に向
けてフレアの周縁近傍部が垂れ下つていき、封止
部近傍のフレア周縁近傍部の肉厚が始めの値より
厚くなつて封止部より外に膨出することがある。 By the way, soda glass, which is much cheaper than lead glass, is used for straight tube bulbs, and lead glass, which is more expensive but easier to work with, is used for stem mount flares. As described above, when the straight pipe valve and the flare are made of different materials, their softening points are naturally different, and therefore, it is necessary to pay particular attention to the following points when bending the straight pipe valve into an annular shape. In other words, the softening point of soda glass for straight tube bulbs is approximately 700℃, and the softening point of lead glass for flares is approximately 615℃, which is a large difference between the two. When heated until it softens, the flare softens before the straight pipe valve softens, and this flare is heated above its softening point.
As a result, the part near the periphery of the flare begins to sag toward the sealing part between the flare and the straight pipe valve, and the wall thickness near the periphery of the flare near the sealing part becomes thicker than the initial value, causing the sealing part to become thicker. It may bulge out further.
第８図はこのフレア周縁近傍部の垂れ下がり状
況を説明するための図であり、先ずステムマウン
トＡは直管形バルブＢの端部所定高さに配置さ
れ、夫々図示しない封止機のヘツドに装着されて
回転すると共に、周辺に配置されたバーナＣによ
り、ステムマウントＡのフレアＤ近傍域が局部的
に加熱される（８−１図）。この加熱により、直
管形バルブＢは加熱部分が軟化して垂れ下がり、
伸びて縮径された部分がフレアＤの周縁部に付着
する（８−２図）。この付着部分は更にしぼられ
たバーナＣにより加熱され、下方部分はカレツト
として焼き落され、封着部は完全に融着するまで
加熱される（８−３図）。ここで、この融着時、
内方のステムＡは鉛ガラスで融点が低いために、
フレアＤ周縁近傍部分が下方に垂れ下がり、第９
図に拡大図示するように、直管形バルブＢの封止
部端面より若干膨出する（同図△ｌで示す）。 FIG. 8 is a diagram for explaining the sagging situation near the peripheral edge of the flare. First, the stem mount A is placed at a predetermined height at the end of the straight pipe type valve B, and each is placed at the head of a sealing machine (not shown). As it is mounted and rotates, the area near the flare D of the stem mount A is locally heated by the burner C placed around it (Figure 8-1). Due to this heating, the heated part of the straight pipe valve B softens and sags.
The expanded and reduced diameter portion attaches to the peripheral edge of flare D (Figure 8-2). This attached part is further heated by a burner C which is turned down, the lower part is burnt off as a cullet, and the sealed part is heated until it is completely fused (Fig. 8-3). Here, during this fusion,
The inner stem A is made of lead glass and has a low melting point, so
The part near the periphery of flare D hangs downward, and the ninth
As shown in the enlarged view in the figure, it bulges out slightly from the end face of the sealing part of the straight pipe valve B (indicated by Δl in the figure).
このようにフレアの一部が封止部より膨出する
と、直管形バルブを曲げる際に使用する加工部材
がフレアの膨出部分に当つて、この膨出部分の周
辺が割れることがある。またこの曲げ加工時に割
れなくても、環形バルブの保管や運搬時などで、
フレアの膨出部分に残つた歪みに応力が集中する
等して前記膨出部分が自然破壊することがあり、
この発生率は数％にも及ぶ。そこで直管形バルブ
の曲げ加工時にフレアの周縁近傍部が封止部より
膨出しないように、作業温度や作業時間を細かく
コントロールしているが、未だ不十分で若干の膨
出は余儀無いものとされているのが現状である。 When a portion of the flare bulges out from the sealing portion in this manner, a processing member used for bending the straight pipe valve may come into contact with the bulge portion of the flare, causing cracks around the bulge portion. In addition, even if the annular valve does not break during this bending process, it may be difficult to store or transport the annular valve.
The bulging part may spontaneously break due to stress concentration on the strain remaining in the bulging part of the flare,
This incidence reaches several percent. Therefore, during bending of straight pipe valves, the working temperature and working time are carefully controlled so that the area near the periphery of the flare does not bulge beyond the sealing part, but this is still insufficient and some bulging is unavoidable. The current situation is that.
本発明の目的は直管形バルブとフレアの材料が
異なり、夫々の軟化点が異なつても両者の封止部
よりフレアの周縁近傍部が外に膨出しないように
直管形バルブを曲げ加工しうる環形蛍光ランプの
製造方法を提供することにある。本発明の他の目
的はフレアの製造工程を少し改良するだけで、他
の製造工程は従来の装置をそのまま使用するよう
にした製造方法を提供することにある。 The purpose of the present invention is to bend a straight pipe valve so that the vicinity of the periphery of the flare does not bulge out from the sealing part of the two, even though the materials of the straight pipe valve and the flare are different and their softening points are different. An object of the present invention is to provide a method for manufacturing a ring-shaped fluorescent lamp. Another object of the present invention is to provide a manufacturing method in which the flare manufacturing process is slightly improved, and other manufacturing processes use conventional equipment as is.
本発明はフレアを鉛ガラスで形成すると共に、
フレアの外に拡げた周縁近傍部の肉厚を最も小さ
くし、その小さくした分を先端部に回して先端部
の肉厚を最も大きくする。このフレアの周縁近傍
部の肉厚はフレアの先端部を直管形バルブに封止
してから、後で熱処理する時にフレアの周縁近傍
部が垂れ下つて肉厚が大きくなる量を見込して決
められる。従つて、直管形バルブを鉛ガラスより
軟化点の高いソーダガラスや低鉛ガラス（鉛含有
量10％以下のもの）を使い、これに鉛ガラスのフ
レアを封止して曲げ加工してもフレアの周縁近傍
部が封止部より外に膨出する心配がなくなり、環
形蛍光ランプの良品率が大幅に向上すると共に、
曲げ加工作業が容易になる。またフレアの周縁近
傍部を薄肉にすることによりフレア先端部が厚肉
になり、従つてフレアの先端部が外部衝撃に対し
て強くなり、保管や運搬時のフレア割れ等のトラ
ブルが減少し、経済的に有利である。 The present invention forms the flare with lead glass, and
The thickness of the area near the periphery that extends outside the flare is made the smallest, and the reduced thickness is transferred to the tip to make the thickness of the tip the largest. The thickness of the wall near the periphery of the flare is determined by taking into account the amount by which the wall thickness will increase when the tip of the flare is sealed into a straight pipe valve and then heat treated later due to the wall thickness near the periphery of the flare sagging. It can be decided. Therefore, even if you use soda glass or low-lead glass (with a lead content of 10% or less) that has a higher softening point than lead glass for straight tube bulbs, seal the flare of the lead glass, and bend it. There is no need to worry about the part near the periphery of the flare bulging out beyond the sealing part, and the yield rate of annular fluorescent lamps is greatly improved.
Bending work becomes easier. In addition, by making the area near the periphery of the flare thinner, the tip of the flare becomes thicker, making the tip of the flare more resistant to external impacts, reducing problems such as flare cracking during storage and transportation. Economically advantageous.
以下本発明に係る製造方法を各工程毎に図面を
参照して詳述する。 Hereinafter, each step of the manufacturing method according to the present invention will be explained in detail with reference to the drawings.
第１図は成形された鉛ガラスのフレア１の断面
図を示し、第２図はこのフレア１を作る際の鉛ガ
ラスチユーブ２の断面図を示す。フレア１は円筒
部１ａと、円筒部１ａから外に円錐状に拡がるテ
ーパ部１ｂに分けられ、円筒部１ａの肉厚をt1、
テーパ部１ｂの周縁近傍部ｍ及び先端部ｎの各肉
厚をt2及びt3とすると、t2＜t1＜t3の関係に形成す
る。この各寸法はt1が0.9±0.05mmが一般的であ
り、このt1に対して例えばt2は0.6〜0.8mm（好ま
しくは0.65〜0.70mm）、t3は1.0〜1.1mmの範囲内に
規制する。またこのフレア１の形成は肉厚がt1の
鉛ガラスチユーブ２を中心軸を中心に回転させな
がら、鉛ガラスチユーブ２の一端部の内外面を、
第２図に示すように、端面と周面方向から炎３で
加熱して充分軟化させる。このとき、鉛ガラスチ
ユーブ２は端部側からも炎３で加熱される関係で
厚肉状に縮径して軟化する。上記厚肉状に縮径し
た端面の軟化部分の加熱を一時的に停止して、ガ
ラスの粘性を低下した後に、図示しないが端面側
よりリーマピンが挿通され、これを八字状に開く
ことにより外に押し拡げ、フレア１が形成され
る。このようにすると、鉛ガラスチユーブ２の端
部は回転による遠心力でテーパ状に拡径されて拡
がるが、ガラスの流動性が低下しているため、先
端部にガラス溜りができて膨出し、肉厚が他より
大きくなる。一方鉛ガラスチユーブ２の端部近傍
の膨出によつて自ずと肉厚が小さくなる。後は、
鉛ガラスチユーブ２の破線箇所を切断すればフレ
ア１が得られる。 FIG. 1 shows a sectional view of a molded lead glass flare 1, and FIG. 2 shows a sectional view of a lead glass tube 2 when making this flare 1. The flare 1 is divided into a cylindrical portion 1a and a tapered portion 1b that expands outward from the cylindrical portion 1a in a conical shape.The thickness of the cylindrical portion 1a is t 1 ,
Let t 2 and t 3 be the respective thicknesses of the peripheral edge portion m and the tip portion n of the tapered portion 1b, which are formed in the relationship of t 2 <t 1 <t 3 . For each dimension, t 1 is generally 0.9 ± 0.05 mm, for example , t 2 is within the range of 0.6 to 0.8 mm (preferably 0.65 to 0.70 mm), and t 3 is within the range of 1.0 to 1.1 mm. be regulated. The flare 1 is formed by rotating the lead glass tube 2 with a wall thickness of t 1 around the central axis, while rotating the inner and outer surfaces of one end of the lead glass tube 2.
As shown in FIG. 2, it is heated with flame 3 from the end face and circumferential direction to sufficiently soften it. At this time, the lead glass tube 2 is also heated from the end side by the flame 3, so that it becomes thicker in diameter and becomes softer. After temporarily stopping the heating of the softened portion of the thickened end face to reduce the viscosity of the glass, a reamer pin (not shown) is inserted from the end face side and is opened in a figure-eight shape to remove the glass. The flare 1 is formed. In this way, the end of the lead glass tube 2 is expanded into a tapered shape due to the centrifugal force caused by rotation, but since the fluidity of the glass is reduced, a glass pool is formed at the tip and bulges out. The wall thickness is larger than others. On the other hand, due to the bulge near the end of the lead glass tube 2, the wall thickness naturally becomes smaller. After that,
Flare 1 can be obtained by cutting lead glass tube 2 along the broken line.
第３図は上記フレア１を用いて形成したステム
マウント４の断面図を示す。この第３図に於て、
５はガラスの排気管、６はリード線、７はフイラ
メントである。このステムマウント４は次の順序
で製造される。まずフレア１の円筒部１ａ内に排
気管５の一端部を挿入し、更にこの両者間にリー
ド線６を挿通して三者を位置決めする。そして、
フレア１の円筒部１ａを加熱して排気管５に溶着
し、リード線６をガラス封止する。その後リード
線６の先端部にフイラメント７をマウントする。 FIG. 3 shows a cross-sectional view of a stem mount 4 formed using the flare 1 described above. In this Figure 3,
5 is a glass exhaust pipe, 6 is a lead wire, and 7 is a filament. This stem mount 4 is manufactured in the following order. First, one end of the exhaust pipe 5 is inserted into the cylindrical portion 1a of the flare 1, and the lead wire 6 is further inserted between the two to position the three. and,
The cylindrical portion 1a of the flare 1 is heated and welded to the exhaust pipe 5, and the lead wire 6 is sealed with glass. Thereafter, the filament 7 is mounted on the tip of the lead wire 6.
第４図は上記ステムマウント４を端部に封止し
た直管形バルブ８の端部断面図を示し、第５図は
直管形バルブ８の端部外周に把持用凹部９を形成
した時の断面図を示す。この直管形バルブ８は安
価なソーダガラスが低鉛ガラスで、その肉厚t4は
1.1±0.02mm程度のものが通常使用される。また
ステムマウント４の封止はドロツプシール法など
の方法で行われ、第８図の従来と同様の封止方法
であり、第１０図に封止部を拡大図示するよう
に、フレア１の周縁近傍部ｍを薄肉に形成してい
るために周縁近傍部ｍが垂れ下がることなく、封
止部１０端面より膨出することがない。又、この
直管形バルブ８の端部とフレア１の先端部ｎの溶
着した封止部１０の肉厚t5はt4より若干大きくな
る。また凹部９の形成は直管形バルブ８の端部を
部分的に加熱軟化させて金型を使つて行われ、こ
の時にフレア１が変形するようなことはない。 FIG. 4 shows a sectional view of the end of the straight pipe valve 8 with the stem mount 4 sealed at the end, and FIG. A cross-sectional view is shown. This straight tube type bulb 8 is made of low-lead soda glass, which is inexpensive, and its wall thickness is t4 .
A diameter of about 1.1±0.02mm is usually used. Further, the stem mount 4 is sealed by a method such as a drop seal method, which is the same as the conventional sealing method shown in FIG. Since the portion m is formed thin, the peripheral edge portion m does not sag and does not bulge out from the end surface of the sealing portion 10. Further, the wall thickness t 5 of the sealing portion 10 where the end of the straight pipe valve 8 and the tip n of the flare 1 are welded is slightly larger than t 4 . Further, the recess 9 is formed by partially heating and softening the end of the straight tube valve 8 using a mold, and the flare 1 is not deformed at this time.
第６図は封止工程から凹部形成工程を経た直管
形バルブ８を環形に曲げ加工する工程を説明する
側面図で、１１はチヤツク、１２は曲成ローラで
ある。即ち、直管形バルブ８は上端の凹部９にチ
ヤツク１１を嵌めて垂直に吊下支持され、この状
態で加熱炉内に入れられて全体が軟化するまで加
熱される。そして、直管形バルブ８が十分に軟化
したところで二分割型の曲成ローラ１２が直管形
バルブ８の下端部をチヤツクして、そのまま直管
形バルブ８に沿つて回転しながら上昇し、直管形
バルブ８を巻き上げて環形に成形する。この曲げ
加工時の作業温度は直管形バルブ８の軟化点を越
えるため、フレア１は直管形バルブ８以上に軟化
して周縁近傍部ｍが垂れて肉厚が大きくなつてく
る。ところが、この肉厚の増加を見込してフレア
周縁近傍部ｍの肉厚を予め薄くしてあるので、曲
げ加工後のフレア１の周縁近傍部ｍは第７図の断
面図に示すように肉厚が始めのt2から少し大きく
なるだけで、封止部１０から外に膨出するところ
までには至らない。 FIG. 6 is a side view illustrating the process of bending the straight tube valve 8 into an annular shape after the sealing process and the recess forming process, in which 11 is a chuck and 12 is a bending roller. That is, the straight tube type bulb 8 is vertically suspended by fitting the chuck 11 into the recess 9 at the upper end thereof, and in this state is placed in a heating furnace and heated until the entire body is softened. Then, when the straight-tube valve 8 has sufficiently softened, the two-part curved roller 12 checks the lower end of the straight-tube valve 8 and rises while rotating along the straight-tube valve 8. The straight pipe valve 8 is rolled up and formed into an annular shape. Since the working temperature during this bending process exceeds the softening point of the straight pipe type valve 8, the flare 1 becomes softer than the straight pipe type valve 8, and the portion m near the peripheral edge sags and becomes thicker. However, in anticipation of this increase in wall thickness, the wall thickness of the portion m near the flare periphery has been thinned in advance, so the portion m near the periphery of the flare 1 after bending has a thickness as shown in the cross-sectional view of FIG. The thickness only increases slightly from the initial thickness t2 , but does not reach the point where it bulges out from the sealing portion 10.
実際、第１図のフレア１を26.5％鉛含有の鉛ガ
ラスでt1＝0.9±0.05mm、t2＝0.6〜0.8mm、t3＝1.0
〜1.1mmの各寸法で製作し、これを使つて上記の
各製造工程を行い、特に曲げ加工時の作業温度を
約700〜800℃の温度で行つたところ、封止部１０
からのフレア１の膨出発生率は０であつた。これ
に対し、同じ鉛ガラスで肉厚を従来のように変化
させずに製作したフレアを使つて同じ条件下で環
状蛍光ランプを製造したところ、封止部からフレ
アの周縁近傍部が0.5〜2.0mm程度飛び出した不良
バルブが約２〜３％の発生率で生じ、本発明の有
効性が実証された。 In fact, flare 1 in Figure 1 is made of lead glass containing 26.5% lead, with t 1 = 0.9 ± 0.05 mm, t 2 = 0.6 to 0.8 mm, and t 3 = 1.0.
The sealing part 10 was fabricated with each dimension of ~1.1 mm, and was used to perform the above manufacturing processes, especially at a working temperature of approximately 700 to 800 degrees Celsius during bending.
The incidence of bulging of Flare 1 was 0. On the other hand, when an annular fluorescent lamp was manufactured under the same conditions using a flare made of the same lead glass without changing the wall thickness as in the conventional case, the distance from the sealing part to the vicinity of the peripheral edge of the flare was 0.5 to 2.0. The incidence of defective valves that protruded by about 2 mm occurred at a rate of about 2 to 3%, demonstrating the effectiveness of the present invention.
上述する本発明の製法における重要な特徴はバ
ルブへのフレアの封止後の熱処理時に封止部から
フレアを膨出させないことであり、これによりフ
レアの自然破壊が皆無となり、バルブ良品率の向
上が図れ、その結果安価で信頼性の良好な環形蛍
光ランプが提供できる。 An important feature of the manufacturing method of the present invention described above is that the flare does not bulge out from the sealing part during heat treatment after sealing the flare in the valve.This eliminates spontaneous destruction of the flare and improves the rate of non-defective valves. As a result, an annular fluorescent lamp that is inexpensive and has good reliability can be provided.
第１図は本発明で使用するフレアの断面図、第
２図は第１図のフレアの製造を説明するガラスチ
ユーブ断面図、第３図は第１図のフレアを用いた
ステムマウントの断面図、第４図及び第５図は第
３図のステムマウントを封止した直管形バルブの
各工程での端部断面図、第６図はバルブ曲げ工程
を説明する側面図、第７図は第６図のバルブ端部
断面図、第８図はステムマウントのドロツプシー
ルによる一般的な封止状況を示す図、第９図は鉛
ガラスステムによる従来の封止部の状況を示す要
部拡大断面図、第１０図は鉛ガラスステムによる
本発明方法における封止部の状況を示す要部拡大
断面図である。
１……フレア、ｍ……フレア周縁近傍部、ｎ…
…フレア先端部、４……ステムマウント、８……
直管形バルブ、９……凹部、１０……封止部。
Fig. 1 is a cross-sectional view of the flare used in the present invention, Fig. 2 is a cross-sectional view of a glass tube explaining the manufacture of the flare shown in Fig. 1, and Fig. 3 is a cross-sectional view of a stem mount using the flare shown in Fig. 1. , Fig. 4 and Fig. 5 are end sectional views at each step of the straight pipe valve with the stem mount sealed in Fig. 3, Fig. 6 is a side view illustrating the valve bending process, and Fig. 7 is a Figure 6 is a sectional view of the end of the bulb, Figure 8 is a diagram showing a general sealing situation with a stem mount drop seal, and Figure 9 is an enlarged cross-section of the main part showing the situation of a conventional sealing part with a lead glass stem. 10 are enlarged sectional views of essential parts showing the state of the sealing part in the method of the present invention using a lead glass stem. 1...Flare, m...Flare peripheral area, n...
...Flare tip, 4... Stem mount, 8...
Straight pipe valve, 9... recess, 10... sealing part.
Claims (1)
部より薄肉にした鉛ガラスのフレアを用いてステ
ムを形成する工程と、ソーダガラス或いは低鉛ガ
ラスよりなる直管形バルブの開口端にステムにお
けるフレアの先端部を封止する工程と、フレア封
止後の直管形バルブの端部に円周に沿つた凹部を
形成する工程と、直管形バルブの凹部をチヤツク
してバルブを環形に曲げ加工する工程を含むこと
を特徴とする環形蛍光ランプの製造方法。1. A process of forming a stem using a lead glass flare whose wall thickness near the peripheral edge of the outwardly expanding taper is thinner than that of the tip, and forming the stem at the open end of a straight tube type bulb made of soda glass or low lead glass. a step of sealing the tip of the flare, a step of forming a concave portion along the circumference at the end of the straight tube valve after sealing the flare, and a step of forming the valve into an annular shape by checking the concave portion of the straight tube valve. 1. A method of manufacturing an annular fluorescent lamp, comprising a step of bending the lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4591281A JPS57162240A (en) | 1981-03-28 | 1981-03-28 | Manufacture of circular fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4591281A JPS57162240A (en) | 1981-03-28 | 1981-03-28 | Manufacture of circular fluorescent lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57162240A JPS57162240A (en) | 1982-10-06 |
| JPH0138341B2 true JPH0138341B2 (en) | 1989-08-14 |
Family
ID=12732451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4591281A Granted JPS57162240A (en) | 1981-03-28 | 1981-03-28 | Manufacture of circular fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57162240A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2625607B1 (en) * | 1988-01-04 | 1990-06-01 | Dumas Pierre Alain | FLUORESCENT BULB WITH TUBULAR FOOT, WITH REVERSE ELECTRODES |
| EP0406499A1 (en) * | 1989-07-06 | 1991-01-09 | Pierre Alain Dumas | Fluorescent bulb having a tubular base with electrodes turned upside down |
-
1981
- 1981-03-28 JP JP4591281A patent/JPS57162240A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57162240A (en) | 1982-10-06 |
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