JPS60127652A - Rapid starting type fluorescent lamp - Google Patents

Abstract

PURPOSE:To improve lamp starting and a maintainance rate of a flux of light by making an alumina coating quantity of an alumina film of a lamp glass tube to be a fixed quantity while making average resistance value of a conductive film in the central part of a glass tube to be the prescribed value. CONSTITUTION:An alumina protective film 3 is applied on a transparent conductive film 2 formed inside a lamp glass tube 1. As an alumina application liquid, alumina powder having the grain diameter not exceeding 50mum is suspended in a pure water for being well dispersed, while a proper quantity of surface activator is added and said liquid is poured into from the top of the glass tube 1 for being dried. Then, the alumina coating quantity is made to be 0.05-0.12mg/ cm<2>. Further, the average resistance value of the conductive film in the central part except both end parts of the glass tube 1 is made to be 0.05-0.35kOMEGA/cm. Thereby, discharge starting voltage at a low temperature is lowered for improving starting while improving a maintainance rate of a flux of light.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rapid-start type fluorescent lamp filled with an inert gas containing krypton or xenon.

[Background of the invention]

Rapid start fluorescent lamps, which are filled with an inert gas containing krypton or xenon in order to save power, generally have poor start-up performance and cannot be lit under low temperature or low voltage conditions. This starting performance can be improved by lowering the resistance value of the conductive film, but as a result, the luminous flux maintenance factor deteriorates. Therefore, measures have been taken to increase the thickness of the alumina protective film formed on the conductive film to prevent the reaction between the conductive film and mercury and to reduce luminous flux reduction due to coloring of the conductive film. Regarding the actual amount, for example, according to JP-A-55-121261, it is stated as 0.026 mg/cm2, but according to experiments by the inventors, it is O.003 to 0.040 mg/cm.
In the range 2, mercury is present in the alumina of the tube wall around the electrode.
It was found that when the alumina protective film was deposited, a black ring-shaped stain was generated, and when the amount of the alumina protective film deposited exceeded 0.12 mg/cm2, the luminous flux deteriorated.

[Purpose of the invention]

The present invention is a Rabbit Star 1 type fluorescent lamp that has a transparent conductive coating on the inner surface of the glass tube and is filled with an inert gas containing krypton or xenon, and has improved characteristics such as starting performance, luminous flux maintenance rate, and lighting appearance. Aim to get a lamp.

[Summary of the invention]

To achieve the above object, the present invention provides a rapid start type fluorescent lamp in which a conductive film, an alumina film, and a phosphor film are sequentially formed on the inner surface of a glass tube, and an inert gas containing krypton or xenon is pierced. The alumina coating amount of the alumina coating is 0.05 to 0.12 mg/cm2.
and the average resistance value 1 of the conductive coating in the central part of the glass tube excluding both ends is 0.05 to 0.35 kΩ.
/cm, lowers the discharge starting voltage at low temperatures compared to conventional products, improves startup performance, improves luminous flux maintenance rate, prevents blackening of the fluorescent lamp tube wall, and improves appearance when lit. This is what I did.

[Embodiments of the Invention] Examples of the present invention will be described with reference to the drawings. Fig. 1 is a partially cross-sectional external front view showing an embodiment of a rabbit-start type fluorescent lamp according to the present invention, Fig. 2 is a diagram showing the relationship between alumina coating amount and luminous flux deterioration, and Fig. 3 is a diagram showing the relationship between alumina coating amount and luminous flux deterioration. Figure 4 showing the relationship between the amount of contamination and the incidence of contamination on the tube wall around the electrode.
The figure shows the relationship between the amount of alumina deposited and the discharge starting voltage.
FIG. 5 is a diagram showing the relationship between the conductive film resistance value and the discharge starting voltage. In FIG. 1, the rapid start type fluorescent lamp according to the present invention has an alumina protective film 3 coated on a transparent conductive film 2 formed on the inner surface of a glass tube J. The alumina coating liquid was made by suspending alumina powder with a particle size of 50 μm or less in pure water and dispersing it well.A suitable amount of a surfactant was added, and this liquid was poured into the upper end of the glass tube 1 and dried. The amount of alumina deposited is 0.002 and O.01, respectively.
,0,0O25,0045,0,070,0,090,
After coating the phosphor film 4 on the alumina protective film 3, a 40W rapid start type fluorescent lamp was manufactured through the normal manufacturing process. . However, the sealed gas was an inert gas containing krypton. The resistance of the conductive film 2 is such that the resistance value per lamp unit length is 0.6.0.45.0.35.0.25.0 when the fluorescent lamp is completed.
Each was adjusted to be 112.0.05.0.01. However, each resistance value of the conductive coating 2 described above indicates the resistance value in the central region of the fluorescent lamp excluding a range of 150 mm from both ends of the tube. Since the conductive coating 2 of the fluorescent lamp is applied while supporting the glass tube vertically during the manufacturing process, the coating becomes slightly thicker at the lower end of the glass tube. Therefore, the resistance value of the conductive coating 2 is usually determined by excluding a range of 150 mm from both tube ends of the fluorescent lamp.
Measurement is performed in the central region where the thickness of the film is approximately uniform, and the value is controlled. The resistance value of the conductive coating 2 within a region within 150 mm from the tube end is generally approximately equal to or slightly higher than the resistance value in the central region excluding the above-mentioned region.

In Figure 2, the resistance value of the conductive film 2 is constant at 0.05 kΩ/cm, and the amount of alumina deposited is 0.002 kΩ/cm as described above.
This figure shows the state of luminous flux deterioration after 1000 hours of lighting when changing from mg/cm2 to 0.20 mg/cm2.

The amount of alumina deposited is 0.01 to 0.12 mg for luminous flux deterioration.
/cm2 is small and almost constant, but 0.002
In the case of mg/cm2 and in the case of 0.16 mg/cm2 or more, luminous flux deterioration is large.

Figure 3 shows the rate of occurrence of contamination on the lamp exterior around the electrodes.
Contamination occurs within the range of 45 mg/cm2, and no contamination occurs when the amount of alumina deposited is approximately 0.05 mg/cm2 or less. From the above results, the amount of alumina deposited is 0.05 to 0.12 mg in order to have little luminous flux deterioration after 1000 hours of lighting and to prevent dirt from forming on the tube wall around the electrodes and damaging the appearance of the fluorescent lamp. /cm2. Next, FIG. 4 is a diagram showing how the discharge starting voltage changes depending on the amount of alumina deposited when the resistance value of the conductive film 2 is kept constant. 97cm is shown. If the resistance value of the conductive film 2 changes, the discharge starting voltage changes, but the state of change in the discharge starting voltage with respect to the amount of alumina deposited is almost the same. In other words, the discharge starting voltage decreases in inverse proportion to the alumina deposition amount up to about 0.07 mg/cm2, and when it exceeds 0.12 mg/cm2, the discharge starting voltage increases slightly, but the above The amount of alumina deposited is 0.05 to 0, which is within the range of reducing luminous flux deterioration and not damaging the appearance of the fluorescent lamp.
．． In the region of 12 mg/cm2, the firing voltage is sufficiently low, and the starting performance of the fluorescent lamp can be improved. If the amount of alumina deposited is less than 0.05 mg/cm2, as mentioned above, mercury will adhere to the alumina on the tube wall around the electrodes, causing stains and damaging the appearance of the fluorescent lamp, as well as preventing discharge. The starting voltage becomes high and the starting performance deteriorates. In addition, if the amount of alumina deposit is more than 0.12 mg/cm2, the luminous flux will deteriorate after 1000 hours of lighting (,
Also, the start-up performance becomes slightly worse. Figure 5 shows alumina coating.

The coating amount was kept constant at 0.12 mg/cm2, and the conductive coating 2
This is a diagram showing the discharge starting voltage at 0°C when the resistance value of is changed. In the figure, A indicates the range of variation in the discharge starting voltage. Taking into account variations, in order to be able to light up at 95% of the rated voltage R at 0°C (one actually possible condition), the resistance value of the conductive film 2 should be set to 0.35 kQ.
/cm or less.

If the resistance value of the conductive film 2 is less than 0.05 kΩ/cm, the alumina protective film 3 may be applied thicker as described above.
Otherwise, it is impossible to prevent the conductive film 2 from reacting with mercury and becoming colored. If the amount of alumina deposited on the alumina protective film 3 is increased to more than 0.12 mg/cm2, the luminous flux maintenance factor deteriorates as shown in FIG. 2 above.

Therefore, in order to improve the luminous flux maintenance factor and enable the fluorescent lamp to operate at 95% of the rated voltage at 0°C, it is necessary to
It is necessary that the resistance value is in the range of 0.05 to 0.35 kQ/cm. Although each of the above embodiments has been described using an inert gas containing krypton as the filler gas, similar results can be obtained when an inert gas containing xenon is used.

Under each of the above conditions, i.e., the amount of alumina deposited on the alumina protective film 3 is in the range of 0.05 to 0.1.2 mg/cm2, and the fluorescence/light emission is achieved except for the area near the electrode within 150 mm from the tube end. The resistance value of the conductive coating 2 in the center of the lamp is 0.0
Rapid-start fluorescent lamps filled with an inert gas containing krypton or xenon, which is 5 to 0.35 kQ/cm, are 11 times more efficient than conventional fluorescent lamps of the same type.
The luminous flux maintenance rate after being lit for 000 hours has improved by about 4%, the discharge starting voltage has been lowered by about 10V at a low temperature of 0°C, and there is no visible dirt on the tube wall around the electrodes, giving it an excellent appearance when lit. The results were obtained.

〔Effect of the invention〕

As mentioned above, the rapid start type fluorescent lamp according to the present invention is a rapid start type fluorescent lamp in which a conductive film, an alumina film, and a phosphor film are sequentially formed on the inner surface of a glass tube, and an inert gas containing krypton or xenon is enclosed. For type fluorescent lamps, the alumina coating amount of the above alumina coating is 0.05~
0.12 mg/cm2, and a conductive liquid in the center of the glass tube excluding both ends.

By setting the average resistance value of the film to 0.05 to 0.35 kθ/cm, the discharge starting voltage at low temperatures is lowered,
Improved luminous flux maintenance rate and prevented blackening of the fluorescent lamp tube wall, resulting in improved start-up performance, luminous flux maintenance rate, and
Moreover, a rapid start type fluorescent lamp having an excellent appearance when lit can be obtained.

[Brief explanation of drawings]

Fig. 1 is a partially sectional front view of the external appearance of an embodiment of a rapid start type fluorescent lamp according to the present invention, Fig. 2 is a diagram showing the relationship between the amount of alumina coating and luminous flux deterioration, and Fig. 3 is a diagram showing the relationship between the amount of alumina coating and luminous flux deterioration. Figure 4 shows the relationship between the amount of alumina deposited and the incidence of contamination on the tube wall around the electrode, Figure 4 shows the relationship between the amount of alumina deposited and the discharge starting voltage, and Figure 5' shows the relationship between the conductive film resistance value and the discharge start. FIG. 3 is a diagram showing the relationship with voltage. 1... Glass tube 2... Conductive coating 3... Alumina coating 4... Phosphor film agent patent attorney
Junnosuke Nakamura

Claims (1)

[Claims] In a rapid start type fluorescent lamp in which a conductive film, an alumina film, and a phosphor film are sequentially formed on the inner surface of a glass tube and an inert gas containing krypton or xenon is sealed, the alumina coating amount of the alumina film is 0.05 to 0. .12
mg/cm2, and the average resistance value of the conductive coating in the central part of the glass tube excluding both ends is 0.05 to 0.
．． 35 kQ/cm Rapid Star 1 type fluorescent lamp.