JP2649974B2 - How to make a light bulb - Google Patents
How to make a light bulbInfo
- Publication number
- JP2649974B2 JP2649974B2 JP1239633A JP23963389A JP2649974B2 JP 2649974 B2 JP2649974 B2 JP 2649974B2 JP 1239633 A JP1239633 A JP 1239633A JP 23963389 A JP23963389 A JP 23963389A JP 2649974 B2 JP2649974 B2 JP 2649974B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- sphere
- tube
- light bulb
- sealing tube
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 本発明電球の製造方法を以下の項目に従って説明す
る。DETAILED DESCRIPTION OF THE INVENTION The method of manufacturing the electric bulb of the present invention will be described according to the following items.
A.産業上の利用分野 B.発明の概要 C.従来技術［第６図］ D.発明が解決しようとする課題 E.課題を解決するための手段 F.実施例［第１図乃至第５図］ a.メタルハライド電球［第１図］ b.チップオフ ｂ−1.半完成品 ｂ−2.チップオフ装置 ｂ−3.チップオフ工程 G.発明の効果 （A.産業上の利用分野） 本発明は新規な電球の製造方法に関する。詳しくは、
ガス封入管のチップオフ部をすっきりさせて球体部の内
部形状を安定させた電球を容易に製造することができる
新規な電球の製造方法を提供しようとするものである。A. Industrial application fields B. Summary of the invention C. Prior art [FIG. 6] D. Problems to be solved by the invention E. Means to solve the problems F. Embodiments [FIGS. 1 to 5] Figure] a. Metal halide bulb [Figure 1] b. Tip-off b-1. Semi-finished product b-2. Tip-off device b-3. Tip-off process G. Effect of the invention (A. Industrial application field) The present invention relates to a novel method for manufacturing a light bulb. For more information,
An object of the present invention is to provide a novel light bulb manufacturing method which can easily manufacture a light bulb in which the tip-off portion of the gas filled tube is made clear and the internal shape of the spherical portion is stabilized.
（B.発明の概要） 本発明電球の製造方法は、球体部と連通され球体部か
ら上方へ延びたガス封入管内に封入ガスを入れた状態で
球体部を液体窒素により冷却して上記ガスを球体部内に
所望量収容させた後、球体部とガス封入管との連結部に
レーザー光を２つの方向から集光点を僅かにずらして照
射して該部分を局部的に加熱溶融し、球体部のガス封入
管連結部を密封すると共にガス封入管を球体部から分離
するようにすることによって、球体部とガス封入管との
境界部を局部的に溶融して該部分を封止すると共に球体
部とガス封入管とを分離することができるので、球体部
の内面形状に極端な凹凸が生じることがなく、また、ガ
ス封入管の球体部からの分離を短時間で行なうことがで
きる。また、２つの方向から照射するレーザー光の集光
点がずれているので、封止部の先端が尖った突起になっ
て残ることもない。(B. Summary of the Invention) The method for manufacturing a light bulb of the present invention is characterized in that the bulb is cooled with liquid nitrogen in a state in which the bulb is filled in a gas-filled tube which is communicated with the bulb and extends upward from the bulb, and the gas is cooled. After the desired amount is accommodated in the spherical portion, the laser beam is irradiated to the connection portion between the spherical portion and the gas sealing tube while slightly shifting the focal point from the two directions, and the portion is locally heated and melted, and the spherical portion is melted. By sealing the gas-sealed pipe connection of the part and separating the gas-sealed pipe from the spherical part, the boundary between the spherical part and the gas-sealed pipe is locally melted to seal the part. Since the spherical portion and the gas sealing tube can be separated from each other, no extreme unevenness occurs in the inner surface shape of the spherical portion, and the gas sealing tube can be separated from the spherical portion in a short time. Further, since the focal points of the laser beams irradiated from the two directions are shifted, the tip of the sealing portion does not remain as a sharp projection.
（C.従来技術）［第６図］ 従来のメタルハライド電球の製造方法につき説明す
る。(C. Prior Art) [FIG. 6] A method of manufacturing a conventional metal halide light bulb will be described.
ａはガラス製の発光管である。 a is an arc tube made of glass.
ｂはガラス製のガス封入管であり、下端部に形成され
た細径部ｃの下端が発光管ａの上部中央に連設されてい
る。Reference numeral b denotes a glass gas sealing tube, and the lower end of a small diameter portion c formed at the lower end is continuously provided at the upper center of the arc tube a.
そして、図示しない金属沃化物粒及び水銀を発光管ａ
内に封入すると共に、アルゴンガス等の不活性ガスをガ
ス封入管ｂを通して発光管ａに封入した後、ガス封入管
ｂをその下端で切り離すと共に発光管ａのガス封入管ｂ
が連設されていた部分を封止する。Then, a metal iodide particle and mercury (not shown) are supplied to the arc tube a.
After the inert gas such as argon gas is sealed in the arc tube a through the gas sealing tube b, the gas sealing tube b is cut off at its lower end, and the gas sealing tube b of the arc tube a is cut off.
Seals the part that has been continuously provided.
上記のように、発光管ａからガス封入管ｂを切り離
し、かつ、発光管ａを密閉する工程、いわゆるチップオ
フ工程は、発光管ａとガス封入管ｂとの連結部分をバー
ナー炎で加熱し、該部分が溶融したところで、ガス封入
管ｂを発光管ａから引き離す方向に移動させることによ
って行なっていた。As described above, in the step of separating the gas-filled tube b from the light-emitting tube a and sealing the light-emitting tube a, that is, the so-called chip-off process, the connecting portion between the light-emitting tube a and the gas filled tube b is heated with a burner flame. When this portion is melted, the gas sealing tube b is moved in a direction to separate from the arc tube a.
（D.発明が解決しようとする課題） 上記した従来の製造方法にあっては、発光管ａとガス
封入管ｂとの連結部をバーナー炎によって加熱溶融して
チップオフを行なっていたので、加熱溶融される範囲が
広範囲となり、発光管ａに広い範囲に亘って変形が生
じ、また、チップオフ後の封止部ｄもその形状が大き
く、かつ、形状も様々となり、これらが、放電に悪影響
を与えたり、強度を低下させたりしていた。また、発光
管ａ内に充分なガスを封入するため、発光管ａを液体窒
素中に浸漬して冷却する必要があり、そのためバーナー
炎は液体窒素の上方に位置しなければならず、液体窒素
の蒸発流によってバーナー炎が揺らぎ、チップオフのた
めの加熱に悪影響が出るという問題もある。(D. Problems to be Solved by the Invention) In the above-described conventional manufacturing method, the connecting portion between the arc tube a and the gas sealing tube b is heated and melted by a burner flame to perform chip-off. The range to be heated and melted is widened, and the arc tube a is deformed over a wide range, and the shape of the sealing portion d after chip-off is large and various in shape. It had an adverse effect or reduced strength. In addition, in order to fill a sufficient gas in the arc tube a, it is necessary to cool the arc tube a by immersing it in liquid nitrogen, so that the burner flame must be located above the liquid nitrogen. There is also a problem that the burner flame fluctuates due to the evaporating flow, and the heating for chip off is adversely affected.
（E.課題を解決するための手段） そこで、上記した課題を解決するために、本発明電球
の製造方法は、球体部と連通され球体部から上方へ延び
たガス封入管内に封入ガスを入れた状態で球体部を液体
窒素により冷却して上記ガスを球体部内に所望量収容さ
せた後、球体部とガス封入管との連結部にレーザー光を
２つの方向から集光点を僅かにずらして照射して該部分
を局部的に加熱溶融し、球体部のガス封入管連結部を密
封すると共にガス封入管を球体部から分離するようにし
たものである。(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the method for manufacturing a light bulb according to the present invention includes filling a sealed gas into a gas sealing tube which is communicated with the spherical portion and extends upward from the spherical portion. After the sphere is cooled by liquid nitrogen in a state where the above-mentioned gas is accommodated in the sphere in a desired amount, the laser beam is slightly shifted from the two directions at the connection between the sphere and the gas sealing tube. Then, the portion is heated and locally melted to seal the gas-sealed tube connecting portion of the sphere portion and separate the gas-sealed tube from the sphere portion.
従って、本発明電球の製造方法によれば、球体部とガ
ス封入管との境界部を局部的に加熱溶融して該部分を封
止すると共に球体部とガス封入管とを分離することがで
きるので、球体部の内面形状に極端な凹凸を生じること
が無く、また、ガス封入管の球体部からの分離を短時間
で行なうことができる。また、２つの方向から照射する
レーザー光の集光点がずれているので、封止部の先端が
尖った突起になって残ることもない。Therefore, according to the method of manufacturing a light bulb of the present invention, it is possible to locally heat and melt the boundary portion between the spherical portion and the gas sealing tube to seal the portion and separate the spherical portion and the gas sealing tube. Therefore, no extreme irregularities occur in the inner surface shape of the spherical portion, and the gas sealing tube can be separated from the spherical portion in a short time. Further, since the focal points of the laser beams irradiated from the two directions are shifted, the tip of the sealing portion does not remain as a sharp projection.
（F.実施例）［第１図乃至第５図］ 以下に、本発明電球の製造方法の詳細を図示実施例に
従って説明する。尚、図示実施例は本発明をメタルハラ
イド電球の製造方法に適用したものである。(F. Example) [FIGS. 1 to 5] Hereinafter, details of the method for manufacturing a light bulb of the present invention will be described with reference to illustrated examples. In the illustrated embodiment, the present invention is applied to a method for manufacturing a metal halide light bulb.
（a.メタルハライド電球）［第１図］ 図中１が車輌前照灯用メタルハライド電球である。(A. Metal halide bulb) [FIG. 1] In the figure, reference numeral 1 denotes a metal halide bulb for a vehicle headlight.
２は石英ガラスから成るガラス球であり、楕円球状の
放電空間を為す球体部３と該球体部３の長軸方向におけ
る両端から突出した矩形断面のピンチシール部４、４が
形成されている。Reference numeral 2 denotes a glass sphere made of quartz glass, which is formed with a sphere 3 forming an elliptical discharge space and pinch seals 4 and 4 having a rectangular cross section protruding from both ends in the major axis direction of the sphere 3.
５、５は上記ピンチホール部４、４内に埋設されたモ
リブデン等から成る金属箔、６、６はタングステンから
成る電極棒であり、これら電極棒６、６の一端は上記金
属箔５、５の一端に連結され、他端は上記球体部３の両
端部に突出している。そして、この球体部３内に突出し
た電極棒６、６の他端が放電電極6a、6aとなる。Reference numerals 5 and 5 denote metal foils made of molybdenum or the like embedded in the pinch holes 4 and 4, and reference numerals 6 and 6 denote electrode rods made of tungsten. One end of each of the electrode rods 6 and 6 is connected to the metal foils 5 and 5. , And the other end protrudes from both ends of the sphere 3. The other ends of the electrode rods 6 projecting into the spherical body 3 become discharge electrodes 6a.
７、７はリード線であり、モリブデン等から成り、ピ
ンチシール部４、４の外端から突出した状態で一部がピ
ンチシール部４、４に埋着され、かつ、他端が前記金属
箔５、５の他端に接続されている。Reference numerals 7, 7 denote lead wires, which are made of molybdenum or the like, are partially embedded in the pinch seal portions 4, 4 in a state of protruding from the outer ends of the pinch seal portions 4, 4, and the other end is the metal foil. 5, 5 are connected to the other ends.
そして、ガラス球２の球体部３内には水銀と一乃至複
数の金属沃化物粒が封入され、かつ、起動ガスとしてア
ルゴン等の不活性ガスが充填されている。Mercury and one or more metal iodide particles are sealed in the spherical portion 3 of the glass bulb 2, and an inert gas such as argon is filled as a starting gas.
８が封止部であり、球体部３の上部中央に位置し、後
述するガス封入管が連結されていたところで、外側は僅
かに突出し、その内側が浅く小さな凹部となっている。Reference numeral 8 denotes a sealing portion, which is located at the center of the upper portion of the spherical portion 3 and to which a gas sealing tube described later is connected. The outside slightly protrudes, and the inside is a shallow and small concave portion.
（b.チップオフ） （ｂ−1.半完成品） ９はチップオフ前の半完成のメタルハライド電球であ
り、球体部３、ピンチシール部４、４は既に形成され、
金属箔５、５、電極棒６、６及びリード線７、７が組み
込まれている。(B. Chip-off) (b-1. Semi-finished product) 9 is a semi-finished metal halide light bulb before chip-off, and the sphere part 3, the pinch seal parts 4, 4 are already formed,
The metal foils 5, 5, the electrode rods 6, 6, and the lead wires 7, 7 are incorporated.
10はガス封入管であり、ガラス球２の材料ガラスと同
じ石英ガラスで形成されており、その下端が球体部３の
上部中央に連結され、その孔10aが球体部３内部と連通
されている。Reference numeral 10 denotes a gas sealing tube, which is formed of the same quartz glass as the material glass of the glass sphere 2, the lower end of which is connected to the upper center of the sphere 3, and the hole 10 a thereof communicates with the inside of the sphere 3 .
（ｂ−2.チップオフ装置） 11は上記半完成品９のガス封入管10を球体部３から切
り離すと共に球体部３のガス封入管10と連通していた孔
3aを封止するためのチップオフ装置である。(B-2. Tip-off device) Reference numeral 11 denotes a hole that separates the gas filling tube 10 of the semi-finished product 9 from the spherical portion 3 and communicates with the gas filling tube 10 of the spherical portion 3.
This is a chip-off device for sealing 3a.
12はガスレーザー、例えば、CO2（炭酸ガス）レーザ
ーである。Reference numeral 12 denotes a gas laser, for example, a CO2 (carbon dioxide gas) laser.
13はビームスプリッターであり、上記ガスレーザー12
から照射されたレーザー光14を２つの系統14a、14bに分
割するためのものである。Reference numeral 13 denotes a beam splitter, and the gas laser 12
This is for splitting the laser beam 14 irradiated from the laser beam into two systems 14a and 14b.
15a、15bは互いに水平方向に間隔を置いて略対向する
ように配置された集光レンズである。Reference numerals 15a and 15b denote condensing lenses arranged so as to be substantially opposed to each other at intervals in the horizontal direction.
そして、ビームスプリッター13により２系統に分割さ
れたレーザー光の一方14aは全反射ミラー16aにより反射
されて集光レンズ15aに入射され、２つの集光レンズ15a
と15bとの間の略中間に位置した点17aに集光される。ま
た、他方のレーザー光14bは全反射ミラー16b、16bによ
り順次反射されて集光レンズ15bに入射され、これも２
つの集光レンズ15aと15bとの間の略中間に位置した点17
bに集光される。そして、上記集光点17aと17bとは一致
することなく、僅かにずれて位置している。このように
集光点17aと17bがずれているので、封止部８の先端が尖
った突起になって残ることがなく、封止部８の外側は丸
みがある。One of the laser beams 14a split into two systems by the beam splitter 13 is reflected by the total reflection mirror 16a and is incident on the condensing lens 15a.
The light is condensed at a point 17a located approximately in the middle between the points 17b and 15b. The other laser beam 14b is sequentially reflected by total reflection mirrors 16b and 16b and is incident on the condenser lens 15b.
A point 17 located approximately halfway between the two condenser lenses 15a and 15b
Focused on b. The light condensing points 17a and 17b do not coincide with each other and are slightly shifted. Since the light converging points 17a and 17b are displaced in this manner, the tip of the sealing portion 8 does not remain as a sharp projection, and the outside of the sealing portion 8 is rounded.
18は上記集光点17a、17bの直ぐ下に位置した冷却浴槽
であり、液体窒素190がオーバーフローされるように供
給されている。Reference numeral 18 denotes a cooling bath located immediately below the light condensing points 17a and 17b, and the liquid bath 190 is supplied so as to overflow.
20は冷却浴槽18の上側に位置し、上下方向に移動自在
とされた支持具であり、上記半完成品９のピンチシール
部４、４とガス封入管10を各別に保持するようになって
いる。Reference numeral 20 denotes a support positioned above the cooling tub 18 and movable vertically, which holds the pinch seal portions 4, 4 of the semi-finished product 9 and the gas sealing tube 10 separately. I have.
（ｂ−3.チップオフ工程） しかして、所定量の金属沃化物粒及び水銀を球体部３
内に入れられた半完成品９を上記支持具20に支持し、か
つ、ガス封入管10が図示しない不活性ガス供給源と接続
される。(B-3. Tip-off step) Then, a predetermined amount of metal iodide particles and mercury are added to the spherical part 3.
The semi-finished product 9 placed inside is supported by the support 20 and the gas sealing tube 10 is connected to an inert gas supply source (not shown).
それから、支持具20が下降し、球体部３が冷却浴槽18
の液体窒素19内に浸漬されると共に球体部３とガス封入
管10との連結部21が略上記集光点17a、17bに位置され
る。Then, the support 20 descends, and the sphere 3 is moved to the cooling bath 18.
And the connecting portion 21 between the spherical portion 3 and the gas sealing tube 10 is positioned substantially at the converging points 17a and 17b.
そして、球体部３が液体窒素19中に所定時間、例え
ば、60秒間、浸漬されて充分に冷却され、所定量の不活
性ガスが球体部３内に入ったとこで、上記レーザー光14
a、14bが球体部３とガス封入管10との連結部21に照射さ
れ、第５図（Ａ）から（Ｄ）へ示す過程を経てガス封入
管10が球体部３から分離され、かつ、球体部３の孔3aが
閉塞されて封止部８となる。The sphere 3 is immersed in the liquid nitrogen 19 for a predetermined time, for example, 60 seconds, and sufficiently cooled, and when a predetermined amount of inert gas enters the sphere 3, the laser beam 14
a and 14b are applied to the connecting portion 21 between the spherical portion 3 and the gas sealing tube 10, and the gas sealing tube 10 is separated from the spherical portion 3 through the process shown in FIGS. 5 (A) to 5 (D). The hole 3a of the sphere 3 is closed to form the sealing portion 8.
（G.発明の効果） 以上に記載したところから明らかなとおり、本発明電
球の製造方法は、球体部と連通され球体部から上方へ延
びたガス封入管内に封入ガスを入れた状態で球体部を液
体窒素により冷却して上記ガスを球体部内に所望量収容
させた後、球体部とガス封入管との連結部にレーザー光
を２つの方向から集光点を僅かにずらして照射して該部
分を局部的に加熱溶融し、球体部のガス封入管連結部を
密封すると共にガス封入管を球体部から分離することを
特徴とする。(G. Effects of the Invention) As is apparent from the above description, the method of manufacturing a light bulb according to the present invention provides a method for manufacturing a light bulb in a state in which a sealed gas is inserted into a gas sealing tube which is communicated with a spherical part and extends upward from the spherical part. Is cooled by liquid nitrogen to contain a desired amount of the gas in the sphere, and then a laser beam is applied to the connection between the sphere and the gas sealing tube by slightly shifting the focal point from the two directions. It is characterized in that the portion is locally heated and melted to seal the connection portion of the gas sealing tube of the spherical portion and to separate the gas sealing tube from the spherical portion.
従って、本発明電球の製造方法によれば、球体部とガ
ス封入管との境界部を局部的に加熱溶融して該部分を封
止すると共に球体部とガス封入管とを分離することがで
きるので、球体部の内面形状に極端な凹凸が生じること
が無く、また、ガス封入管の球体部からの分離を短時間
で行なうことができる。また、２つの方向から照射する
レーザー光の集光点がずれているので、封止部の先端が
尖った突起になって残ることもない。Therefore, according to the method of manufacturing a light bulb of the present invention, it is possible to locally heat and melt the boundary portion between the spherical portion and the gas sealing tube to seal the portion and separate the spherical portion and the gas sealing tube. Therefore, no extreme irregularities occur in the inner surface shape of the spherical portion, and the gas sealing tube can be separated from the spherical portion in a short time. Further, since the focal points of the laser beams irradiated from the two directions are shifted, the tip of the sealing portion does not remain as a sharp projection.
尚、上記実施例で示した具体的な構造や方法は、本発
明の実施に当っての具体化のほんの一例であって、これ
らによって本発明の技術的範囲が限定的に解釈されるも
のではない。It should be noted that the specific structures and methods shown in the above embodiments are only examples of the embodiment of the present invention, and the technical scope of the present invention is not limitedly interpreted by these. Absent.
第１図乃至第５図は本発明電球の製造方法の実施の一例
を示すもので、第１図は電球の斜視図、第２図は第１図
のII−II線に沿う断面図、第３図は概略正面図、第４図
はチップオフが為されるときの概略正面図、第５図は
（Ａ）から（Ｄ）へチップオフ工程の進行を順を追って
示す要部の概略拡大断面図、第６図は従来の電球の製造
方法の一例を示す斜視図である。 符号の説明 １……電球、３……球体部、10……ガス封入管、14a、1
4b……レーザー光、17a、17b……集光点、19……液体窒
素、21……ガス封入管連結部1 to 5 show an embodiment of the method for manufacturing a light bulb according to the present invention. FIG. 1 is a perspective view of the light bulb, FIG. 2 is a sectional view taken along the line II-II of FIG. 3 is a schematic front view, FIG. 4 is a schematic front view when chip-off is performed, and FIG. 5 is a schematic enlargement of a main part showing the progress of the chip-off process from (A) to (D) in order. FIG. 6 is a perspective view showing an example of a conventional method for manufacturing a light bulb. DESCRIPTION OF SYMBOLS 1... Light bulb, 3... Sphere, 10.
4b Laser light, 17a, 17b Focus point, 19 Liquid nitrogen, 21 Gas filling tube connection
───────────────────────────────────────────────────── フロントページの続き (72)発明者 入澤 伸一 静岡県清水市北脇500番地 株式会社小 糸製作所静岡工場内 (72)発明者 中村 昭 埼玉県入間郡三芳町大字竹間沢11番地 株式会社田中製作所内 (72)発明者 石塚 剛 埼玉県入間郡三芳町大字竹間沢11番地 株式会社田中製作所内 (56)参考文献 特開 昭60−68531（ＪＰ，Ａ) 特開 昭59−18121（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shin-ichi Irzawa 500 Kitawaki, Shimizu-shi, Shizuoka Prefecture Inside the Koito Manufacturing Co., Ltd.Shizuoka Plant Inside the factory (72) Inventor Go Ishizuka 11-Takumazawa, Miyoshi-cho, Iruma-gun, Saitama Prefecture Inside the Tanaka Works (56) References JP-A-60-68531 (JP, A) JP-A-59-18121 (JP, A)
Claims (1)
ガス封入管内に封入ガスを入れた状態で球体部を液体窒
素により冷却して上記ガスを球体部内に所望量収容させ
た後、球体部とガス封入管との連結部にレーザー光を２
つの方向から集光点を僅かにずらして照射して該部分を
局部的に加熱溶融し、球体部のガス封入管連結部を密封
すると共にガス封入管を球体部から分離する ことを特徴とする電球の製造方法1. A sphere portion is cooled by liquid nitrogen in a state in which a sealed gas is inserted into a gas sealing tube which is communicated with the sphere portion and extends upward from the sphere portion, and a desired amount of the gas is accommodated in the sphere portion. Apply laser light to the connection between the sphere and the gas filling tube.
Irradiates the light-collecting point slightly from one direction and locally heats and melts the part, seals the gas-sealed tube connection of the sphere, and separates the gas-sealed tube from the sphere. How to make a light bulb
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1239633A JP2649974B2 (en) | 1989-09-14 | 1989-09-14 | How to make a light bulb |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1239633A JP2649974B2 (en) | 1989-09-14 | 1989-09-14 | How to make a light bulb |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03102758A JPH03102758A (en) | 1991-04-30 |
| JP2649974B2 true JP2649974B2 (en) | 1997-09-03 |
Family
ID=17047617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1239633A Expired - Lifetime JP2649974B2 (en) | 1989-09-14 | 1989-09-14 | How to make a light bulb |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2649974B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5918121A (en) * | 1982-07-21 | 1984-01-30 | Toshiba Corp | Apparatus for welding glass parts |
| JPS6068531A (en) * | 1983-09-21 | 1985-04-19 | Toshiba Corp | Method of cutting exhaust tube of tubular bulb by fusion and its device |
-
1989
- 1989-09-14 JP JP1239633A patent/JP2649974B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03102758A (en) | 1991-04-30 |
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