JP3963143B2 - Fluorescent lamp - Google Patents
Fluorescent lamp Download PDFInfo
- Publication number
- JP3963143B2 JP3963143B2 JP2002289375A JP2002289375A JP3963143B2 JP 3963143 B2 JP3963143 B2 JP 3963143B2 JP 2002289375 A JP2002289375 A JP 2002289375A JP 2002289375 A JP2002289375 A JP 2002289375A JP 3963143 B2 JP3963143 B2 JP 3963143B2
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent lamp
- arc tube
- flare stem
- lead wires
- blow
- 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
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Description
【0001】
【発明の属する技術分野】
本発明は、フィラメントおよび内部リード線の蒸発により発生した飛散物質がフレアステム先端部に付着・堆積する事によって起こる内部リード線間の短絡を防止した蛍光ランプに関する。
【0002】
【従来の技術】
蛍光ランプを高周波で長期間点灯すると、フィラメント物質(一般にタングステン)やフィラメントに塗布した電子放射物質(BaO等)およびフィラメントを保持している内部リード線(Ni,Fe等)が蒸発・飛散し、フィラメントに近いリード線根元部近傍のガラス部に付着・堆積する。特に、ランプの寿命末期には上記の飛散が激しくなり、これらはリード線根元部に付着・堆積しやすい。
【0003】
上記付着物は導電性物質であるため、堆積すると通電する可能性がある。すなわち、絶縁された一対の内部リード線間に、リード線根元部近傍ガラス部に付着・堆積した飛散物質により導電経路が形成され、内部リード線間が短絡されることがある。
【0004】
このような場合、フィラメントが断線した後、一対の内部リード線間に飛散物質が付着・堆積してできた導電経路に電流が流れて発熱し、リード線根元部近傍のガラス部を熱破損させたり、大きな電力損失を生じる不具合を生ずる。
【0005】
また、フレアステムはガラスで構成されており、ガラスは高温になると絶縁性が失われるという性質があるため、リード線間を流れる電流によりガラスが溶融し始めると、ガラス自体に電流が流れ、短時間で溶融してしまうおそれもある。
【0006】
そこで、上記のような飛散物質が付着・堆積し難い蛍光ランプを構成すべく、特開平11−345596号に記載の蛍光ランプが知られている。
【0007】
【発明が解決しようとする課題】
上記特開平11−345596号に記載されている従来の蛍光ランプにおいては、通電するための第1および第2の内部リード線根元部近傍ステムの頂部に、前記リード線を貫通させて電気的絶縁性を有する遮蔽部材を設けている。しかしこの場合、蛍光ランプの製造プロセスで発光管内部に高圧エアーによるブローを入れたとき、上記遮蔽部材にエアーブローが当たり、そのためブローの方向が発光管内面方向に向かうようになる。この時、管径が細い発光管の場合には、上記方向転換されたブローによって発光管内面に塗布している蛍光体被膜が剥離・脱落するという欠点があった。
【0008】
本発明は、上述のような問題を解決するためになされたものであり、電極部からの飛散物質の付着・堆積を効果的に抑えることができ、かつエアーブロー時に蛍光膜の剥離・脱落を生じないようにした蛍光ランプを提供することを目的としてなされたものである。
【0009】
【課題を解決するための手段】
上記目的を達成するために、本発明においては内部リード線根元部近傍のガラス部を覆う電気的絶縁性を有する遮蔽部材を、ステム部排気孔を覆わないような形状としたことを特徴とする。
【0010】
【発明の実施の形態】
本発明について実施例をもとに説明する。図1(a)は本発明の蛍光ランプ端部の横断面図、同図(b)は縦断面図である。図3(a)、(b)、(c)は本発明の遮蔽板の形状を示す三面図である。また、図2は従来の蛍光ランプ端部の断面図であり、図4は従来の遮蔽板6の形状を示す3面図である。
【0011】
図1および図2において、1はガラスからなる発光管、2は発光管1内面に塗布された蛍光体被膜、3はフレアステム、4は遮蔽部材、5は排気管、6はフィラメントおよび電子放射物質、7a,7bは対をなす内部リード線、9は排気管5の開口部である。
【0012】
図1(a)または(b)のように、蛍光ランプにおいて発光管1の内面には均一に蛍光体被膜2が塗布されており、この発光管1の端部はフレアステム3によって封止されている。フレアステム3には電極飛散物質の付着・堆積を防ぐ遮蔽板4と、発光管1内をほぼ真空にするための排気管5が設けられている。
【0013】
蛍光ランプ製造プロセスにおいて、発光管1をフレアステム3で封止する時に、封止部の形状を整えるために排気管5から発光管1の内部に高圧エアーによるブローを吹き込んでいる。この時に、排気管5から吹き込まれたブローが遮蔽板4に当たることによって、従来技術では発光管1の内面方向に方向を変えてしまい、発光管1の内面に塗布された蛍光体被膜2に方向を変えたブローが直接当たり、蛍光体被膜2がそれによって剥がれて脱落してしまう(A部)不具合がまれに発生することがあった。
【0014】
本発明においては、上述のような不具合が発生しないように、遮蔽板4の形状を高圧エアーによるブローが当たり難い形状としたことを特徴としている。
【0015】
すなわち図1に示すように、遮蔽板4の形状を、高圧エアーによるブローが当たる部分において一部切り欠き部ないし括れ部8を有する平面形状としたことで、排気管5から吹き込まれる高圧エアーによるブローは遮蔽板4に当たり難くなる。それにより、高圧エアーによるブローは方向を変えることなく発光管1の内部に吹き込むことができるようになり、発光管1の内面に塗布された蛍光体被膜2が剥がれて脱落してしまうといった不具合の発生を抑えることができる。
【0016】
【発明の効果】
遮蔽板の形状を高圧エアーによるブローが当たり難い形状としたことで、排気管から吹き込まれる高圧エアーによるブローが遮蔽板に当たり難くなり、発光管の内面に塗布された蛍光体被膜が剥がれて脱落してしまうといった不具合の発生を抑えることができる。
【図面の簡単な説明】
【図1】本発明の一実施例の蛍光ランプ端部横断面図および縦断面図。
【図2】従来の蛍光ランプ端部横断面図および縦断面図。
【図3】本発明の一実施例の遮蔽板の形状を示す三面図。
【図4】従来の遮蔽板の形状を示す三面図。
【符号の説明】
1…ガラス発光管、2…蛍光体被膜、3…フレアステム、4…遮蔽部材、5…排気管、6…フィラメントおよび電子放射物質、7a,7b…対をなす内部リード線、8…遮蔽板の一部切り欠きないし括れ部、9…排気管5の開口部、A…蛍光体被膜の脱落部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluorescent lamp that prevents a short circuit between internal lead wires, which is caused by scattered substances generated by evaporation of filaments and internal lead wires adhering to and depositing on the tip of a flare stem.
[0002]
[Prior art]
When a fluorescent lamp is lit at a high frequency for a long period of time, the filament material (generally tungsten), the electron emitting material applied to the filament (BaO, etc.) and the internal lead wires (Ni, Fe, etc.) holding the filament are evaporated and scattered. It adheres and deposits on the glass near the lead root near the filament. In particular, the above-mentioned scattering becomes intense at the end of the lamp life, and these are likely to adhere to and accumulate on the root portion of the lead wire.
[0003]
Since the adhering substance is a conductive substance, there is a possibility of energization when deposited. That is, a conductive path may be formed between the insulated pair of internal lead wires due to the scattered substances adhering to and deposited on the glass portion near the root portion of the lead wire, and the internal lead wires may be short-circuited.
[0004]
In such a case, after the filament breaks, a current flows through the conductive path formed by the adhering / depositing material between the pair of internal lead wires, generating heat, causing the glass portion near the lead wire root portion to be thermally damaged. Or a problem that causes a large power loss.
[0005]
In addition, since the flare stem is made of glass and the glass loses its insulating properties at high temperatures, when the glass starts to melt due to the current flowing between the lead wires, a current flows through the glass itself, There is also a risk of melting over time.
[0006]
Therefore, a fluorescent lamp described in Japanese Patent Application Laid-Open No. 11-345596 is known in order to construct a fluorescent lamp in which the above scattered substances are difficult to adhere and accumulate.
[0007]
[Problems to be solved by the invention]
In the conventional fluorescent lamp described in Japanese Patent Laid-Open No. 11-345596, the lead wires penetrate the top portions of the stems in the vicinity of the root portions of the first and second internal lead wires for energization, and are electrically insulated. The shielding member which has property is provided. However, in this case, when you turn the blow by the high-pressure air inside the arc tube in the manufacturing process of the fluorescent lamp, per an air blow to the shielding member, therefore the direction of the blow is directed toward the arc tube inner surface direction. At this time, in the case of an arc tube having a small tube diameter, there has been a drawback that the phosphor coating applied to the inner surface of the arc tube is peeled off and dropped by the above-mentioned direction-changed blow.
[0008]
The present invention has been made in order to solve the above-described problems, and can effectively suppress the adhesion and deposition of scattered substances from the electrode part, and can peel and drop off the fluorescent film during air blowing. The present invention has been made for the purpose of providing a fluorescent lamp that is not generated.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is characterized in that the shielding member having electrical insulation covering the glass portion in the vicinity of the inner lead wire root portion is shaped so as not to cover the stem portion exhaust hole. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described based on examples. FIG. 1A is a transverse sectional view of an end portion of the fluorescent lamp of the present invention, and FIG. 1B is a longitudinal sectional view thereof. 3A, 3B, and 3C are three views showing the shape of the shielding plate of the present invention. FIG. 2 is a cross-sectional view of an end portion of a conventional fluorescent lamp, and FIG. 4 is a trihedral view showing the shape of a conventional shielding plate 6.
[0011]
1 and 2, 1 is a light emitting tube made of glass, 2 is a phosphor coating applied on the inner surface of the
[0012]
As shown in FIG. 1 (a) or (b), and uniformly
[0013]
In the fluorescent lamp manufacturing process, when the
[0014]
The present invention is characterized in that the shape of the shielding plate 4 is made difficult to blow by high-pressure air so that the above-described problems do not occur.
[0015]
That is, as shown in FIG. 1, the shape of the shielding plate 4 is a planar shape having a notch portion or a
[0016]
【The invention's effect】
By making the shape of the shielding plate difficult to blow with high-pressure air, blowing with high-pressure air blown from the exhaust pipe makes it difficult to hit the shielding plate, and the phosphor coating applied to the inner surface of the arc tube peels off and falls off It is possible to suppress the occurrence of problems such as
[Brief description of the drawings]
FIG. 1 is a cross-sectional view and a longitudinal sectional view of an end of a fluorescent lamp according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view and a vertical cross-sectional view of an end portion of a conventional fluorescent lamp.
FIG. 3 is a trihedral view showing the shape of a shielding plate according to an embodiment of the present invention.
FIG. 4 is a trihedral view showing the shape of a conventional shielding plate.
[Explanation of symbols]
DESCRIPTION OF
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002289375A JP3963143B2 (en) | 2002-10-02 | 2002-10-02 | Fluorescent lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002289375A JP3963143B2 (en) | 2002-10-02 | 2002-10-02 | Fluorescent lamp |
Publications (2)
Publication Number | Publication Date |
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JP2004127688A JP2004127688A (en) | 2004-04-22 |
JP3963143B2 true JP3963143B2 (en) | 2007-08-22 |
Family
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Application Number | Title | Priority Date | Filing Date |
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JP2002289375A Expired - Fee Related JP3963143B2 (en) | 2002-10-02 | 2002-10-02 | Fluorescent lamp |
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JP (1) | JP3963143B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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USRE44685E1 (en) | 1994-04-28 | 2013-12-31 | Opentv, Inc. | Apparatus for transmitting and receiving executable applications as for a multimedia system, and method and system to order an item using a distributed computing system |
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2002
- 2002-10-02 JP JP2002289375A patent/JP3963143B2/en not_active Expired - Fee Related
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Publication number | Publication date |
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JP2004127688A (en) | 2004-04-22 |
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