JPS61284046A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To prevent irregular flickers of the light output, by specifying the diameter of an inner leading-in wire which holds a filament coil installed at the end of the bulb. CONSTITUTION:At the inner surface of a straight cylindrical glass bulb 1, plural rare earth phosphors 2 are spread, both ends of the bulb 1 are sealed airtight by two stems 3, and two inside leading-in wires 4 of a nickel-plated iron are penetrated electrically and installed at each stem. After forming the end of the inside leading-in wire in a hook form, both ends of a tungsten doublefilament coil 5, applied with plural alkaline earth metallic oxides, are calked and installed to be an electrode, the other end of the leading-in wire is contacted to the end of the glass bulb 1 and connected to the two pins of a G13 base 6, and, mercury 7 and argon gas 8 are sealed in the glass bulb 1. In this case, the diameter of the lealding-in wires which hold the filament coils is restricted below 0.55mm. Therefore, irregular flickers of the light output can be prevented, as well as a drop of the cathode voltage is reduced, to improve the lamp efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fluorescent lamp having an inner tube diameter of 24 mm to 2911111 mm and a lamp current of 0.31 A.

BACKGROUND OF THE INVENTION Generally, fluorescent lamps are constructed as follows. That is, a phosphor is applied to the inner surface of a cylindrical glass tube, both ends of this glass tube are hermetically sealed with two stems, and two lead-in wires are passed through and attached to these stems. A filament carp with an electron radioactive material coated on the inside end of the glass tube.

Both ends of the tube are attached to serve as electrodes, and the other end is connected to two pins on a cap that is glued to the end of the glass tube, and mercury and rare gas are sealed inside the glass tube.

Among these fluorescent lamps, in recent years, starter-type fluorescent lamps with a tube inner diameter of 24 rWn to 29 mm have become mainstream for the purpose of saving power, saving materials, and saving space. This is because by reducing the tube inner diameter, lamp efficiency and ballast efficiency can be improved while maintaining compatibility with conventional lamps.

Problems to be Solved by the Invention Fluorescent lamps with a tube inner diameter of 24 to 29 mm can save power by improving efficiency, but because the tube inner diameter is reduced, the lamp impedance usually increases. Since the power supply voltage and ballast remain the same, the lamp voltage increases and the lamp current decreases.

On the other hand, the lamp voltage of a fluorescent lamp can be divided into a cathode drop, a positive column drop, and an anode drop. Of these, the anode falling part is formed to generate mercury ions to be supplied to the positive column by the ionization action of electrons. Since this ionization effect normally occurs at a period on the order of several hundred μS,
Correspondingly, the voltage drop also has an oscillating component. When this vibration occurs, ionization is performed efficiently, so the anode voltage drop is smaller than when it does not occur.

This vibration is generally called anode vibration. This anode vibration tends to become more unstable as the tube inner diameter becomes smaller and as the lamp current becomes smaller.

Therefore, in fluorescent lamps with tube inner diameters of 24 rttm to 29 rttm, stable anode vibration is difficult to occur. When it becomes difficult for the anode vibration to occur stably, the anode vibration will randomly occur and disappear in a relatively short period of time, resulting in irregular changes in the anode voltage. This results in irregular variations in the light output from the positive column via lamp voltage and lamp current, so-called irregular flickering, which is extremely unpleasant when used in lighting.

That is, as mentioned above, the inner diameter of the tube is 24 to 29 mm.
Fluorescent lamps of this type tend to have irregular flickering in their light output, which is a problem in terms of lamp quality.

Means to Solve the Problem The inventors focused on the fact that anode vibration is a periodic phenomenon of ionization near the anode. Considering that the nearby electric field plays a major role, we investigated the effect of the diameter of the internal lead-in wire inside the glass tube on the anode vibration. As a result, it was found that anode vibration occurs stably when the wire diameter is 0.56 mm or less.

That is, in order to solve the above problem, the present invention reduces the wire diameter of the internal lead-in wire supporting the filament coil to 0.
The length is limited to 55 mm or less.

Effect: With this configuration, the electric field near the anode is strengthened, ionization is performed efficiently, the anode oscillates stably, and irregular flickering of the light output can be prevented.

Example @1 Figure shows an example of the present invention, in which the inner diameter of the pipe is 26
A plurality of rare earth phosphors 2 are coated on the inner surface of a straight cylindrical glass tube 1 of +++m, and both ends of this glass tube are hermetically sealed with two stems 3, each stem having a wire diameter of 6. Two internal lead-in wires 4 made of nickel-plated iron wire (item 0) are electrically passed through and attached, and the ends of these internal lead-in wires are formed into a hook shape, and then a tungsten double is coated with multiple alkaline earth metal oxides. Both ends of the filament coil 5 were caulked and attached to form electrodes, and the distance between these two electrodes was set to 50C1n. Then, the other end of the lead-in wire was glued to the end of the glass tube 1 and connected to two pins of G130 gold 6. Inside the glass tube 1, mercury 7 and argon gas 8 of 340 Pa are sealed.

This lamp was lit for 10oO hours using a commercial frequency 1ooV power source with a lamp current of 0.31 to 0.39 people, and was visually inspected for irregular flickering, and no irregular flickering occurred. . Furthermore, when the lamp voltage was examined using an oscilloscope to check for the presence or absence of anode vibration, it was confirmed that it existed stably.

In addition, according to the above embodiment, the inner diameter of the pipe was 27.5rfrI.
An R-ring cylindrical glass tube was used, an internal lead-in wire with a wire diameter of 5.5 mm was used, and the distance between the electrodes along the discharge path was 530 mm.
When a lamp with a 10 q base was lit for 1,000 hours at a lamp current of 0.55 to 0.65, no irregular flickering occurred and stable anode vibration was observed. was confirmed.

Further studies by the inventors revealed that when the wire diameter of the internal lead-in wire exceeds 0.55 mm, it becomes difficult for the anode to vibrate stably, and irregular flickering begins to occur. For example, in the case of each of the above embodiments, when the wire diameter of the internal lead-in wire is 0.6 mm, which is the conventional value, or 0.75 mm, which is thicker than that, the anode vibration becomes unstable and irregular flickering is observed. It was done. On the other hand, the wire diameter of the internal lead-in wire is 0.
If it was less than 46 wn, the mechanical strength would be weakened and the electrode shape would vary widely, which was unfavorable in terms of lamp quality.

As mentioned above, the wire diameter of the internal lead-in wire is 0.45# to 0.5
It was confirmed that the 6wn fluorescent lamp has stable anode vibration and no irregular flickering.

In addition, the conventional tube inner diameter of these fluorescent lamps is 24 mm.
Compared to lamps with a threshold of ~29, no problems such as deterioration of characteristics other than irregular flickering occurred.

In addition, the present invention is applicable to lamps constructed with structures and materials other than the above-mentioned embodiments, but is essentially a fluorescent lamp in which the lamp current is o, s 1A No, e s in the order of tube inner diameter 24 + m to 29 m, and The wire diameter of the lead-in wire may be in the range of 0.46 to 0.55.

As described in the detailed description of the invention, the present invention is applicable to pipes having an inner diameter of 24 to 29 r.
In a fluorescent lamp with rar+ and a lamp current of 0.31 to 0.65 mm, by setting the wire diameter of the internal lead-in wire supporting the filament coil to a range of 0.45 ra to 0.55 mm, Fluorescence has excellent effects, such as stably existing anode vibration and preventing irregular flickering of light output, while also reducing anode voltage drop, which does not affect light output, and improving lamp efficiency. It is possible to provide a lamp.

[Brief explanation of the drawing]

The figure is a sectional view showing a fluorescent lamp according to an embodiment of the present invention. 1... Glass tube, 2... Fluorescent material, 3-
...Stem, 4...Internal lead-in line, 6...
...Filament coil.

Claims (1)

[Claims] The inner diameter of the tube is 24 mm to 29 mm, and the lamp current is 0.31.
A fluorescent lamp of A to 0.65 A, characterized in that the diameter of the internal lead-in wire supporting the filament coil provided at the end of the tube is in the range of 0.45 mm to 0.55 mm. Fluorescent lamp.