JPH0220800Y2

JPH0220800Y2 -

Info

Publication number: JPH0220800Y2
Application number: JP16474282U
Authority: JP
Priority date: 1982-10-29
Filing date: 1982-10-29
Publication date: 1990-06-06
Also published as: JPS5967900U

Description

【考案の詳細な説明】（技術分野）本考案は螢光灯点灯装置に関する。[Detailed explanation of the idea] (Technical field) The present invention relates to a fluorescent lamp lighting device.

（背景技術）第１図は従来の螢光ランプを示す一部断面正面
図で、ガラス管１の内壁には螢光体２が塗布さ
れ、その両端はステム３で封止され、該ステム３
にはリード線４が埋め込まれており、リード線４
には電子放射性物質を塗布したフイラメント５が
取り付けられ電極６を形成している。そして、ガ
ラス管１及びステム３から成る空間には、排気・
真空工程後に水銀粒及び希ガスが封入され放電空
間を形成している。(Background Art) FIG. 1 is a partially sectional front view showing a conventional fluorescent lamp, in which the inner wall of a glass tube 1 is coated with a phosphor 2, both ends of which are sealed with a stem 3.
A lead wire 4 is embedded in the lead wire 4.
A filament 5 coated with an electron radioactive material is attached to form an electrode 6. The space consisting of the glass tube 1 and the stem 3 has an exhaust gas and
After the vacuum process, mercury particles and rare gas are sealed to form a discharge space.

而して、かかる螢光ランプは周知の如く、電界
により加速された電子が水銀原子に衝突し、水銀
原子を励起し、この励起水銀が基底状態の水銀原
子に戻る時に、主として254nmの紫外線を放出
し、この紫外線が螢光体２に照射されると、螢光
体２は可視光を発し、螢光ランプが発光する。そ
して、螢光ランプを点灯していると、点灯時間の
経過とともに、電極近傍の管壁にスポツト状の黒
化が発生し見苦しくなるという欠点を有してい
る。 As is well known, in such fluorescent lamps, electrons accelerated by an electric field collide with mercury atoms, excite the mercury atoms, and when the excited mercury returns to the ground state of the mercury atoms, they mainly emit ultraviolet light of 254 nm. When the phosphor 2 is irradiated with this ultraviolet light, the phosphor 2 emits visible light and the fluorescent lamp emits light. When a fluorescent lamp is turned on, as the lighting time elapses, spots of blackening occur on the tube wall near the electrodes, making it unsightly.

（考案の目的）本考案は上記欠点に鑑みなされたもので、その
目的とするところは、螢光ランプの点灯経過とと
もに、電極近傍の管壁に発生するスポツト状の黒
化を解消した螢光灯点灯装置を提供するにある。(Purpose of the invention) The present invention was devised in view of the above drawbacks, and its purpose is to eliminate the spot-like blackening that occurs on the tube wall near the electrodes as the fluorescent lamp lights up. To provide light lighting devices.

（考案の開示）第２図は本考案の一実施例を示し、ａは一部断
面正面図、ｂは同上の横断面図である。その構成
は、従来と同様に構成された螢光ランプのフイラ
メント５の近傍でガラス管１の外側に磁界発生装
置７を設けると共に、ガラス管１内のフイラメン
ト５近傍で且つ、上記磁界発生装置７の発生磁界
Ｂと、上記フイラメント５が陰極を形成する時の
ランプ電流ｉとのベクトル積（-i→×Ｂ→）にて示
される方向に非磁性体から成る板状体８を設けた
ことを特徴とする。(Disclosure of the invention) FIG. 2 shows an embodiment of the invention, in which a is a partially sectional front view and b is a cross-sectional view of the same. The structure is that a magnetic field generating device 7 is provided outside the glass tube 1 near the filament 5 of a fluorescent lamp configured similarly to the conventional one, and a magnetic field generating device 7 is provided near the filament 5 inside the glass tube 1. A plate-shaped body 8 made of a non-magnetic material is provided in the direction indicated by the vector product (-i→×B→) of the generated magnetic field B and the lamp current i when the filament 5 forms a cathode. It is characterized by

而して、かかる構成の螢光ランプにおいて、磁
界発生装置７により磁界Ｂを印加すると、陰極を
形成するフイラメント５から飛び出した電子放射
性物質が、陰極近傍の熱や高速電子との衝突等に
より電離されて陽イオンとなり、この陽イオンが
ローレンツ力を受けて（-i→×Ｂ→）の方向にその
軌道が曲げられ、ガラス管１の内壁に付着しよう
とするが、上述のように、フイラメント５の近傍
に非磁性体の板状体８が存在するため、ガラス管
１の内壁には付着せず、従つて、従来の螢光ラン
プで見られたようなスポツト状黒化が発生しない
ものと推測される。 In a fluorescent lamp having such a configuration, when a magnetic field B is applied by the magnetic field generator 7, the electron radioactive material ejected from the filament 5 forming the cathode is ionized due to heat near the cathode, collision with high-speed electrons, etc. This positive ion is subjected to the Lorentz force, bends its trajectory in the direction of (-i→×B→), and tries to attach to the inner wall of the glass tube 1, but as mentioned above, the filament Since the non-magnetic plate 8 is present near the glass tube 5, it does not adhere to the inner wall of the glass tube 1, and therefore, spot-like blackening as seen in conventional fluorescent lamps does not occur. It is assumed that.

（考案の効果）本考案は上記のように、螢光ランプのフイラメ
ントの近傍に磁界発生装置を設けると共に、該磁
界発生装置の発生磁界Ｂと、上記フイラメントが
陰極を形成する時のランプ電流ｉとのベクトル積
（-i→×Ｂ→）にて示される方向に非磁性体から成る
板状体を設けたので、従来のように点灯時間の経
過とともに電極近傍の管壁に発生するスポツト状
の黒化を解消することができる螢光灯点灯装置を
提供することができた。(Effects of the invention) As described above, the present invention provides a magnetic field generating device near the filament of a fluorescent lamp, and generates a magnetic field B of the magnetic field generating device and a lamp current i when the filament forms a cathode. Since a plate made of a non-magnetic material is provided in the direction indicated by the vector product (-i→×B→) of It was possible to provide a fluorescent lamp lighting device that can eliminate the blackening of the light.

[Brief explanation of the drawing]

第１図は従来の螢光ランプを示す一部断面正面
図、第２図は本考案の一実施例を示し、ａは一部
断面正面図、ｂは同上の横断面図である。１……ガラス管、２……螢光体、３……ステ
ム、４……リード線、５……フイラメント、６…
…電極、７……磁界発生装置、８……板状体。 FIG. 1 is a partially sectional front view of a conventional fluorescent lamp, and FIG. 2 is a partially sectional front view of an embodiment of the present invention. 1... Glass tube, 2... Fluorescent material, 3... Stem, 4... Lead wire, 5... Filament, 6...
...electrode, 7...magnetic field generator, 8...plate-shaped body.

Claims

[Scope of utility model registration request]

In a fluorescent lamp lighting device that lights a fluorescent lamp equipped with a pair of electrodes made of a filament to which an electron radioactive substance is applied to both ends of the glass tube via a lighting device, a magnetic field is generated outside the glass tube near the filament. In addition to providing a device, the vector product (-i→×B→) of the magnetic field B generated by the magnetic field generating device and the lamp current i when the filament forms a cathode near the filament in the glass tube.
A fluorescent lamp lighting device characterized in that a plate-like body made of a non-magnetic material is provided in the direction shown in .