JPH07262964A - Method and device for prolonging lifetime of fluorescent tube - Google Patents

Abstract

PURPOSE:To reduce the influence of an electric field generated near electrodes and a magnetic field to delay the blackening, and prolong the lifetime by stretching a band made of magnetic material over the glass surface of a fluorescent tube at electrode positions in both ends thereof or changing the structure of the electrodes. CONSTITUTION:A band made of the C-shape magnetic material 1 is stretched around the periphery of coiled electrode filaments 6 of both ends of a fluorescent tube 2 over a glass tube. A V-type, U-type and O-type band can be used in place of the C-type. A core of the filament 6 is fitted in the coaxial direction with the fluorescent tube 2, or the filament 6 is folded into two to form a bifilar winding. Furthermore, shielding plates 7 made of metal plate are fitted to both ends of the filament 6. Stretching of a C-type band is desirable to be used with other method. Exposure of one part of the fluorescent coating with electron or gas molecular by the generation of an electric field due to the discharging phenomenon and the generation of a magnetic field due to the filament 6 is thereby reduced to delay the blackening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for extending the life of fluorescent lamps for illumination.

[0002]

2. Description of the Related Art Conventionally, the structure of a fluorescent tube for illumination is a double coil type in which a fluorescent material is applied to the inner wall of a long and narrow glass tube, and an electron emitting material serving as a heat source for generating electrons is applied to both ends of the glass tube. An electrode with a filament is attached, and the mercury vapor enclosed in the glass tube generates ultraviolet rays by the action of thermoelectrons from the filament, and this ultraviolet ray excites the fluorescent paint in the tube to emit light. .

[0003]

Mercury vapor is enclosed in the inside of the fluorescent tube, which is caused by the emission of thermoelectrons by heating the electrode filaments at both ends of the tube and the voltage applied to both electrodes. When a discharge occurs, the movement of electrons caused by the discharge causes the fluorescent substance on the inner wall of the glass tube to excite and emit light when colliding with the mercury vapor enclosed in the tube to generate ultraviolet rays.
It is used as lighting.

However, when the fluorescent tube is used for a long period of time, a blackening phenomenon first occurs on the glass tube wall near the electrodes, the blackened portion gradually spreads, and then the illuminance decreases, and then the lighting becomes unstable. Finally, it reaches the end of its life.

Since the fluorescent tube that has reached the end of its life is discarded, the mercury vapor inside is discharged into the atmosphere due to damage to the glass tube or the like, resulting in environmental pollution.

[0006] Therefore, by prolonging the life of the fluorescent tube and reducing the amount of waste of the fluorescent tube, it is possible to reduce environmental pollution due to heavy metals such as mercury, and at the same time, to reduce the consumption of the fluorescent tube and to achieve an economic effect. The purpose is to be able to.

[0007]

[Means for Solving the Problems] In a commonly used fluorescent tube, the glass tube wall near the electrodes on both ends of the fluorescent tube gradually becomes black as it ages. This is especially noticeable. The part is especially remarkable on the fluorescent coated surface where the axial core line of the coiled filament is extended, because the internal filament is a double coil type made in a linear shape, initially black spots appear in spots, and gradually It extends black around the black dots.

In a fluorescent tube driven by an AC power source, an electric field is generated by a discharge phenomenon, a magnetic field is generated by an electrode shape of a coiled filament, and the gas enclosed in the tube is an electric field.
Electrons and mercury molecules inside are affected by the influence of the magnetic field, especially the magnetic lines of force generated by the coiled filament.

Due to the influence of the magnetic field lines radiated from the axial center of the coiled filament, the electrons emitted from the filament and the heavy-mass mercury molecules enclosed in the tube have a high collision energy, and due to the discharge phenomenon, they are higher than the power cycle. Vibration is superimposed on the power supply to create a magnetic field in the coiled filament, and electrons and gas molecules ride on the generated magnetic field and continue to hit the same part of the fluorescent paint on the inner wall of the fluorescent tube, resulting in a black burn mark on the fluorescent paint on the glass tube wall. In addition, the coiled filament causes vibration such as deformation due to electromagnetic force generated between the coil wires due to pulsating current of the inrush current at the time of start-up, and the electron-emitting substance coated on the filament peels and falls off gradually. Deterioration progresses.

Therefore, as one of the methods for reducing the influence of the electric field and magnetic field generated in the vicinity of the electrodes on both ends of the fluorescent tube, a partition wall with a shield is provided, and the structure of the electrode is changed to suppress the generation of the electric field and magnetic field. Therefore, it becomes possible to extend the life of the fluorescent tube.

[0011]

[Function] By placing a shield in the radiation line such as the magnetic field generated by the electromagnetic action of an alternating current and the generation of an electric field due to a discharge phenomenon, the radiation line causes repulsion with the shield body and is disturbed by bending, etc. I can do things.

The magnetic lines of force generated by the coil-shaped filament of the fluorescent tube can magnetize the magnetic substance in the vicinity, and because of the alternating magnetic field, the magnetic field generated by the canceling action due to the residual magnetism of the magnetic substance decreases, and It is possible to extend the life of the fluorescent tube by weakening the force acting by disturbing the electric field and the magnetic field by using a shield such as a conductor and reducing the influence on the electron emission paint and the fluorescent paint applied to the electrodes.

While making use of the conventional double coil filament technology, the direction of the magnetic lines of force generated in the filament can be changed by changing the mounting direction of the filament to reduce the influence on the fluorescent coating surface of the glass tube wall and the electrode shape. In order to reduce the generation of a magnetic field, etc., the filament coil is folded and wound, and a double structure electrode is used to cancel the magnetic field of the opposite phase, and the filament coil is generated in a ring shape. The life of the fluorescent tube can be extended by confining the magnetic field and preventing leakage of magnetic field lines.

[0014]

EXAMPLES Examples will be described with reference to the drawings.
In FIG. 1, the outer circumference of the electrodes located at both ends of the fluorescent tube body is banded from above the glass tube by the C-shape of the magnetic material 1 and attached so as to cover both ends of the coil-shaped filament.

In FIG. 2, as in the case of FIG. 1 described above, the coiled filament is attached so as to cover both ends of the coiled filament with the V-shaped magnetic substance of the magnetic substance 1.

In FIG. 3, as in FIGS. 1 and 2, the U-shaped magnetic material is attached to the fluorescent tube directly by the magnetic material 1, or the U-shaped magnetic material is attached to the fluorescent lamp fixture. There is also a way to save.

In FIG. 4, the O-shape of the magnetic material 1 is substantially similar to the banding of the C-shape of FIG. 1, and the C-shaped magnetic material is extended and overlapped, and the overlapped portion is magnetically separated. A gap is provided because it is necessary to keep it.

In FIG. 5, a double-coiled filament found in a conventional fluorescent tube whose mounting direction corresponds to a right angle to the glass tube is changed to a glass tube so that the same direction as that of the glass tube is provided. On the other hand, the coiled filament is attached at a position where it has a coaxial relationship with the axis of the filament.

In FIG. 6, shield plates made of metal plates are provided at both ends of the electrode filament.

In FIG. 7, a bifilar winding in which a filament coil is folded back in two in the shape of an electrode filament to be parallel and wound at the same time is used as a coiled filament for energizing terminals.

In FIG. 8, the filament coil is shaped like a toroidal electrode, the electrode is a circular filament, and both electrodes are attached facing each other.

Further, in order to obtain a shielding effect by a conductor, a magnetic material or the like around the electrodes on both ends of the electrode-shaped fluorescent tube shown in FIGS. 5, 6, 7 and 8, FIGS. By adding the method shown in FIG. 4, the effect can be further enhanced.

[0023]

Since the present invention is constructed as described above, it has the following effects.

In the method shown in FIGS. 1, 2, 3, and 4, the conventional fluorescent tube is used as it is, so that the life of the fluorescent tube can be extended only by adding a fine external portion.

Since it has been possible to extend the service life by processing only the fluorescent tube, it is possible to use the conventional fluorescent lamp fixture as it is.

A fluorescent tube having a long life has a large economical effect because the number of times of replacement is reduced, and the lighting equipment is often installed at a high place, so that the troublesomeness of tube replacement can be avoided.

Since the amount of the fluorescent tubes to be disposed of is reduced, it is possible to reduce environmental pollution due to heavy metals such as mercury.

As compared with the conventional fluorescent tube, the blackening phenomenon in the vicinity of the electrode is remarkably delayed, the illuminance is maintained and the activation by the lighting tube is much faster than that of the fluorescent tube of the same aging.

[Brief description of drawings]

FIG. 1 is a perspective view showing a C-shaped magnetic body set near the electrode side of a fluorescent tube.

FIG. 2 is a perspective view showing a diagram in which a V-shaped magnetic body is set near the electrode side of a fluorescent tube.

FIG. 3 is a perspective view showing a U-shaped magnetic body set near the electrodes of a fluorescent tube.

FIG. 4 is a perspective view showing a diagram in which an O-shaped magnetic body is set near the electrode side of the fluorescent tube.

FIG. 5 is a perspective view showing an attachment portion of an electrode filament inside a fluorescent tube.

FIG. 6 is a perspective view showing an attachment portion of an electrode filament inside a fluorescent tube.

FIG. 7 is a perspective view showing an attachment portion of an electrode filament inside a fluorescent tube.

FIG. 8 is a perspective view showing an attachment portion of an electrode filament inside the fluorescent lamp.

[Explanation of symbols]

 1 Magnetic Material 2 Fluorescent Tube Glass 3 Electrode Lead Terminal 4 Glass Stem 5 Lead Wire and Electrode Holder 6 Electrode Filament 7 Metal Shielding Plate 8 Electrode Holder

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[Procedure amendment]

[Submission date] July 18, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

Claims (6)

[Claims] 1. A method of banding a filament forming electrodes on both ends of a fluorescent tube with a medium such as a metal and a magnetic material from above the glass tube, and a C-shape shown in FIG.
V-shaped, U-shaped in FIG. 3, O-shaped in FIG. 4 and the like. A method of magnetically covering with a medium such as the body. 2. The fluorescent tube glass main body and the electrode filament are mounted such that the circular filament of the fluorescent tube glass main body and the axial core of the coiled filament shown in FIG. How to install in parallel. 3. A device as shown in FIG. 7 in which a bifilar winding in the form of a parallel double wire coil filament, in which a filament coil is folded in two and wound at the same time, in the shape of an electrode filament. 4. A device shown in FIG. 8 in which the shape of the electrode filament is a toroidal shape in which a filament coil is formed in a circular shape. 5. An apparatus in which a shield plate is provided on both ends of a coiled filament so as to cover the end faces of the axial core of the coiled filament made of a medium such as metal and magnetic material shown in FIG. 6. A method in which the method of claim 1 is used in combination with each of claim 2, claim 3, claim 4, and claim 5.