JPS58121539A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To stably generate anode vibration at the beginning of turning on a fluorescent lamp, by coating an electron emissive material on an electrode, which is connected to internal lead-in wires of an electrode structure, from a central part of the electrode to positions with a specific distance to the internal lead-in wire. CONSTITUTION:An electron emissive material 7 is coated on a tungsten coil filament electrode 6 of an electrode structure 3 from a central part of the electrode 6 to positions where a distance (a) to internal lead-in wires 5 is from 0.5 to 2mm.. In this way, anode vibration of the electrode operated as an anode side is surely generated to extremely decrease an output difference of light at every half cycle in initial turning on especially with the lapse of time about 1,000hr after lighting of a fluorescent lamp, resulting in the decrease of flickering, in case of illumination with a relatively short distance, for instance, used for a desk stand, uncomfortable flickering frequently generated in the fluorescent lamp, in which an external diameter of a tubular glass bulb is from 24mm. to 27mm. with a lamp current from 270mA to 330mA, can be sufficiently reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical details of the invention The present invention relates to fluorescent lamps, and in particular, to a relatively low-wattage fluorescent wrap used in a commode stand, etc., to reduce flickering of light at the end of a tube-shaped glass bulb. This invention relates to an improvement in the structure of a fluorescent lamp that reduces the number of fluorescent lamps.

TECHNICAL BACKGROUND OF THE INVENTION Fluorescent lamps that are generally lit by alternating current at a commercial frequency are i! Depending on the alternation of the source voltage, the lamp current varies and the light output varies. However, most of the light except for the ends of a fluorescent lamp comes from the positive column, and the light output fluctuates at twice the frequency of the power supply, so the fluctuations are difficult to perceive with the naked eye and are a particular problem. Must not be. At both ends of the fluorescent lamp, the electrode at the end of the tube-shaped glass bulb becomes an anode or a cathode depending on the alternation of the source voltage, and the brightness of the anode glow due to anode vibration on the anode side of the electrode changes. Since the brightness is lower than that of cathode glow, fluctuations in the light at the same frequency as the power supply frequency, that is, flickering, can be felt to the naked eye. However, the flicker caused by the difference in brightness between the anode glow and the cathode glow caused by the anode vibration is relatively small.

When the anode vibration on the anode side disappears, the anode glow disappears and the cathode glow increases, the difference in brightness between the anode and the cathode increases, and flickering becomes stronger.

Problems with the background technology are easy to notice and give off a sense of discomfort. The discomfort caused by the flickering of fluorescent lamps can be solved by using relatively low-wattage 10'W or 15W fluorescent lamps made of tubular glass pulp with an outer diameter of 255mm or 1.5mm for desk lamps, etc. When the light source is a fluorescent lamp,
Since the light output emitted from the yyizme I skin is close to the naked eye, there was a problem in that it was easily felt by the 1%.

In order to alleviate this problem, as mentioned above, the anode vibration that occurs when the electrode of a fluorescent lamp becomes an anode should be generated stably without disappearing, and the anode glow should be maintained while the cathode It would be possible to weaken the flickering by reducing the difference in brightness from the glow, but conventionally there was no way to generate this anode vibration stably, making it impossible to weaken the flickering, and thus making it impossible to reduce the discomfort caused to the naked eye. There was a problem.

OBJECTS OF THE INVENTION The present invention has been made in view of the problems of the background art described above, and it is possible to stably generate anode vibration on the anode side of the electrode of a fluorescent lamp, 2 and thus maintain stable anode glow. An object of the present invention is to provide an improved fluorescent lamp capable of reducing flicker.

Summary of the Invention The present invention provides a method in which the distance from the center of the electrode connected to the internal lead-in line of the electrode assembly to the internal lead-in line is 0.5 mm or more.
This is a fluorescent lamp that can stably generate anode vibration in the initial stage of lighting of the fluorescent lamp by depositing an electron emitting material up to the position m.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained with reference to the illustrated embodiments. FIG.
FIG. 2 is a partially cutaway front view showing an enlarged portion of the electrode structure of the same embodiment.

A phosphor coating (2) is coated on the inner surface of a tubular glass pulp (1) with an outer diameter of 25.4M+m±1.5mm.
Electrode structures (3) are attached to both ends of the above tubular glass pulp (1).
is sealed. The above electrode structure (3) is a stem (4)
It has a tungsten coil filament electrode (6) connected to the end of the internal lead-in wire f5) and (51), and an electron emitting material (7) is connected from the center of the electrode to the end. ) is deposited.The inside of the tubular glass pulp (1) is exhausted via the exhaust pipe (8) provided in the stem (4), and easily dischargeable gas such as argon and a small amount of mercury are is encapsulated and sealed, and a base (9) is adhered to the end of the tubular glass pulp (1) with base cement.

Bin 00) which becomes the terminal of the fluorescent lug of the base (9) above)
It is led out from the K stem (4), is electrically conductively connected to the electrode sleeve, and is attached to the internal lead-in wire (5) up to a distance a of 1 am.

The operation of the fluorescent lamp shown in FIGS. 1 and 2 will now be described.

FIG. 3 shows the temperature T of a bright spot generated on the electrode of a fluorescent lamp during discharge by varying the distance a (im) between the internal lead-in wire shown in FIG. (color temperature 2°C). Temperature T of the above bright spot. (color temperature 1°C) was measured using an optical pyrometer. As the distance a increases, the bright spot temperature rises rapidly, and the bright spot temperature becomes 1
It was confirmed that in the region A where the bright spot temperature is higher than 1,025°C, the anode vibration disappears, and in the region B where the bright spot temperature is 1,025°C or less, the anode vibration occurs.

4 and 5, the waveform of the lamp voltage vL is shown on the top,
The lower part is a characteristic curve diagram showing the waveform of the light output corresponding to the lamp voltage, and the lamp voltage shown above shows each waveform when the anode vibration disappears.

That is, in the region B of FIG. 3, a light output having the waveform shown in FIG. 4 is emitted, and in the region A of FIG. 3, the light output having the waveform shown in FIG. 5 is emitted.

The difference in optical output dt in Figure 4 (the difference between the half-wave in which anode vibration occurs and the maximum effective value v) has been reduced to approximately 48% of the difference in optical output d2 in Figure 5. It turned out that there was. In the present invention, the upper limit of the distance a between the internal lead-in wire and the end to which the electron emitting material is adhered is set to 21 nm, taking into account the risk of extinction of anode vibration. If the distance a is smaller than the lower limit of 0.5 mm, there will be no problem in the generation of anode vibration, but this is undesirable because the decomposition of the electron-emitting substance may be insufficient and the anode glow may disappear due to this influence.

Effects of the Invention As described in detail above, the present invention provides a fluorescent material characterized in that an electron emitting substance is deposited at a distance of Q, 5 mm to 2 nm from the central part of the electrode of the electrode structure to the internal lead-in line. This is because the anode vibration of the electrode on the anode side of the lamp is reliably generated.

The difference in light output between half cycles of a fluorescent lamp is extremely small, especially in the initial stage of lighting after approximately 1,000 hours have elapsed since the lamp was turned on, and flickering is reduced. In lighting, when the outer diameter of the tubular glass bulb is 24 mm to 27 mm and the lamp current is 270 mA to 330 mA, it can sufficiently reduce the unpleasant flickering that often occurs with fluorescent lamps, and exhibits excellent effects. It is something to do. It goes without saying that the present invention is not limited to the above-mentioned lighting for desk lamps, etc., but can be applied to other lighting such as general lighting to have effects.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the fluorescent rambou of the present invention;
Fig. 2 is a partially cutaway front view showing an enlarged portion of the electrode structure of the same example, and Fig. 3 shows the distance a (mm) from the center of the electrode to the internal lead-in line and the bright spot temperature of the electrode of the fluorescent lamp. T. C.O.
), Figures 4 and 5 are curve diagrams showing the relationship between lamps and
FIG. 6 is a characteristic curve diagram showing the waveforms of voltage and optical output when anode vibration occurs and when it disappears, respectively. 1. Tubular glass bulb 2.. Phosphor coating 3.. Electrode structure 5.. Internal lead-in wire 6.. Electrode 7.. Electron emitting material

Claims (1)

[Scope of Claims] A tube-shaped glass bulb whose inner surface is coated with a phosphor coating, and an electron-emitting device connected to an internal lead-in wire installed in a stem sealed at both ends of the tube-shaped glass bulb. an electrode assembly comprising an electrode coated with a substance; In the above tube-shaped glass bulb, in which the mercury and easily dischargeable gas are sealed, the electrode connected to the internal lead-in line of the electrode assembly is located at a distance from the center of the electrode assembly to the internal lead-in line. A fluorescent lamp characterized in that an electron emitting material is coated to a depth of 0.5 mm to 2 mm.