JPS60133652A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To improve the startability of a fluorescent lamp by making the average resistance value of a transparent conductive coating in the area near the electrode on the thinner fluorescent film side larger than five times the resistance value of a transparent conductive coating in the central area of the fluorescent lamp. CONSTITUTION:On the inner wall of a glass tube 1, a transparent conductive coating 2 is provided, and, on this coating 2, a protective coating 3 consisting of a fine-grained alumina is formed. On this coating 3, a fluorescent film 4 is provided which contains more than 5wt% grains, whose average diameter is less than 10mum, and then a rare gas including krypton or xenon is enclosed in the glass tube 1. In such a fluorescent lamp, the average resistance value of the conductive coating 2 in the area near an electrode 5 on the thinner side of the fluorescent film 4 is made more than five times the resistance value of the conductive coating in the central area of the fluorescent lamp. In this way, the glow discharges caused near the electrode on the thinner fluorescent film side is kept from concentration, making it easy to shift from glow discharge to arc discharge. Therefore, the discharge start voltage of a fluorescent lamp can be lowered, and a three wave-length area light emitting and power-saving rapid start fluorescent lamp can be obtained which can be easily lit up even at a low temperature of 0 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fluorescent lamp having a fluorescent film using a phosphor having a small particle size and encapsulating krypton or xenon.

[Background of the invention]

The particle size is 10 μm, such as in 6-wavelength range fluorescent lamps.
For fluorescent lamps that use the following small fluorescent bodies, there is no problem if argon is used as the filler gas like in ordinary fluorescent lamps, but in order to save power, rare gases such as krypton or xeno are used. In the case of enclosing a fluorescent lamp, the starting performance of the fluorescent lamp becomes poor, and there is a drawback that the lamp cannot be lit at commercial power supply voltage, especially at low temperatures. When starting a rapid-start type fluorescent lamp that has a transparent conductive coating (NESA film) on the inner surface of the glass tube, glow discharge occurs between the electrode and the conductive coating near the electrode, and this glow discharge causes the fluorescent lamp to emit light. When the electricity spreads from the electrodes at both ends to the center of the tube and connects, it turns into an arc discharge and starts the fluorescent lamp. When the particle size of the phosphor coated on the conductive film becomes smaller, such as in a 6-wavelength fluorescent lamp, the phosphor film becomes dense, making it difficult for current to flow through the conductive film. Alternatively, since a gas containing xenon or the like is less likely to ionize than argon gas, the glow discharge is less likely to progress toward the center of the tube, resulting in poor starting performance. As a countermeasure to this problem, attempts have been made to lower the resistance of the conductive coating in the fluorescent lamp and to apply a thick alumina protective film on the conductive coating, but these efforts have not completely resolved the poor start-up performance. Not yet reached.

[Purpose of the invention]

The present invention is directed to rapid-start type fluorescent lamps that use a phosphor with a small particle size, such as low-wavelength fluorescent lamps, and are filled with a rare gas containing krypton or xenon in order to save power. The purpose is to improve bootability.

[Summary of the invention]

During the manufacturing process, the fluorescent film is usually applied by holding the glass tube vertically and pouring the fluorescent paint from the top, so it is not a problem that the film is thinner at the top and thicker at the bottom. If there is a thin part of the fluorescent film as described above near the electrode of a fluorescent lamp, it becomes easier for current to flow between the electrode and the conductive film in that part, and the current flows from the electrode to the conductive film. The glow discharge current before starting the fluorescent lamp is concentrated in the thin part of the fluorescent film, and the glow discharge does not progress to the center of the fluorescent lamp and transition to arc discharge. In order to prevent this situation, the fluorescent lamp according to the present invention has a fluorescent film on a conductive film containing particles with an average particle size of 10 μm or more by weight of 5 or more, and a rare metal containing krypton or xenon. In a gas-filled fluorescent lamp, the average resistance value of the transparent conductive coating in the region near the electrode on the side where the fluorescent film is thinner is made to be at least five times the resistance value of the transparent conductive coating in the central region of the fluorescent rung. This prevents the glow discharge current from concentrating in the area near the electrode where the fluorescent film is thin, thereby improving the startup performance of the fluorescent lamp.

[Embodiments of the invention]

Next, an embodiment of the present invention will be explained with reference to the drawings. Figure 1 is a partial cross-sectional view showing an embodiment of the power-saving type Ravid Star 1 fluorescent lamp according to the present invention, and Figure 2 is a partial cross-sectional view showing an embodiment of the power-saving type Ravid Star 1 fluorescent lamp according to the present invention. 1
A diagram showing the relationship between the proportion of particles of 0 μm or less and the discharge starting voltage. Figure 6 shows the conductive coating between the tube end and a position including point P, which is X away from the first electrode toward the counter electrode. Figure 4 shows the relationship between the distance X and the discharge starting voltage when . It is a figure which shows the relationship between and discharge starting voltage. As shown in Fig. 1, the power-saving rapid start fluorescent lamp according to this embodiment is as follows:
A transparent conductive film 2 mainly composed of tin oxide is provided on the inner surface of the glass tube 1, and a fluorescent film 4 is applied onto a protective film 6 made of fine alumina particles formed thereon to seal the electrodes 5. It is filled with mercury and a gas whose main component is krypton as a rare gas. Using the above-mentioned power-saving rapid-start fluorescent lamp, changes in the discharge starting voltage will be shown when the particle size ratio of the phosphor particles, the state of the conductive film, and the resistance value are changed. Figure 2 shows the relationship between the weight ratio of particles with a particle size of 10 μm or less in the fluorescent film and the discharge starting voltage (■3).If the average particle size of 10 μm or less of particles weighs less than 5, the discharge starts. Although no increase in voltage is observed, when the weight ratio exceeds 5, the discharge amount 1 starting voltage increases rapidly. Figure 6 shows a point at the end of the fluorescent lamp where the fluorescent film is thinner, where P is the distance from electrode 5 to the opposite electrode as shown in Figure 1. , is a diagram showing the results of measuring the relationship between the distance X and the discharge starting voltage in the case where there is no conductive coating 2 within the length l from the position including this point P to the tube end. In the figure, the area where there is no conductive film 2 is x)
5Q mm, i.e. in front of electrode 5 (direction of counter electrode)
When it exceeds 50+nrn, the discharge starting voltage increases. As a result, the fluorescent film 4 is approximately 59 mm away from the thinner electrode 5,
It has been found that an increase in the discharge starting voltage can be prevented by increasing the resistance of the conductive coating 2 in the region near the electrode within a distance range of 1.2 mm. "The resistance value of the conductive coating 2 in the area near the electrode 5 is equal to the resistance value of the conductive coating 2 in the central area of the fluorescent lamp.
of! In order to know how high the resistance value should be, let's assume that the former is RkΩ/cm and the latter is R6197cm.
FIG. 4 shows the results of obtaining the discharge starting voltage by varying /Ro. As is clear from FIG. 4, R/it.

≧5, that is, when the resistance value of the conductive film in the area near the electrode is 5 times or more than the resistance value of the conductive film in the central area, the discharge starting voltage can be sufficiently lowered. The resistance value is 5 of the conductive coating resistance value in the central region.
If it is less than double, the discharge starting voltage cannot be lowered. Note that the portion 6 of the curve shown by the dotted line in FIG. 4 is the discharge starting voltage when no conductive film exists in the region near the electrode shown in FIG. 5. According to the above results p4
Using a 0W glass tube, the average resistance value of the conductive coating 2 in the area near the electrode over a range of 5Q mm from the tube end on the side where the fluorescent film 4 becomes thinner to the front of the electrode 5 is the conductivity in the central area of the fluorescent lamp. A fluorescent film 4 containing particles with a particle size of 10 μm or less by weight of 5 or more is coated on a conductive film 2 formed to have a resistance value of 5 times or more than the film resistance value, and a rare gas containing krypton is used as a filler gas. A power-saving rapid start fluorescent lamp of 40 W and emitting light in 5 wavelength ranges was manufactured according to the process described above.

As a result, the discharge starting voltage at 0°C was 180 to 190
■It was. Conventionally, this type of fluorescent lamp had a discharge starting voltage of 190 to 205 cm at Q°C, so it sometimes did not light up at low temperatures, but the fluorescent lamp according to the present invention
It has become possible to turn on the lamp even with a commercial power supply voltage of 200 µm.

〔Effect of the invention〕

As described above, the fluorescent rung according to the present invention has a fluorescent film formed on a conductive film and containing 5% by weight or more of particles having an average particle size of 1 μm or less, and a fluorescent lamp sealed with a rare gas containing crybution or xenon. In a light lamp, the average resistance value of the conductive film in the region near the electrode on the side where the fluorescent film is thinner is made to be five times or more than the conductive film resistance value in the central region of the fluorescent lamp. By preventing the concentration of glow discharge occurring in the vicinity and facilitating the transition from glow discharge to arc discharge, it is possible to lower the discharge starting voltage of the fluorescent lamp, and it is possible to easily light the fluorescent lamp even at a low temperature of 0°C. It is possible to manufacture a power-saving Rapid Star 1 fluorescent lamp that emits light in a 6-wavelength range.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing an embodiment of the power-saving Lapinodoscoot fluorescent lamp according to the present invention, and FIG. 2 shows the relationship between the ratio of particles with a particle size of 1 μm or less in the phosphor and the firing voltage. A diagram showing the relationship, Figure 6 shows the X from the electrode to the counter electrode.
A diagram showing the relationship between the distance X and the discharge starting voltage when the conductive film between the position including the distant point P and the tube end is excluded. Figure 4 shows the conductive film resistance in the area near the electrode of the fluorescent lamp. FIG. 3 is a diagram showing the relationship between the ratio of conductive film resistance in the central region and the discharge starting voltage. 2... Conductive film 4... Fluorescent film 5 - Junnosuke Chui, patent attorney representing the electrode

Claims (1)

[Claims] In a fluorescent lamp having a fluorescent film formed on a conductive film and containing particles with an average particle size of 10 μm or less by weight of 5 or more, and filled with a rare gas containing krypton or xenon, the fluorescent film is thin. A fluorescent lamp characterized in that the average resistance value of the conductive coating in the region near the side electrodes is 5 times or more the average resistance value of the conductive coating in the central region of the fluorescent lamp.