JPS58218748A - Rapid start type fluorescent lamp - Google Patents

Abstract

PURPOSE:To improve luminous flux maintability by forming a transparent conductive coat on the inner surface of a glass tube, a protective coat consisting of alumina and antimony on it, and a phosphor coat on it. CONSTITUTION:A rapid start type fluorescent lamp is formed by forming a transparent conductive coat 2 made of tin oxide, a protective coat 3 made of a compound that mixes antimony oxide or antimony chloride by 10-50wt% in r- alumina for r-alumina, on the said coat, so that the thickness can be 0.03- 0.15mg/cm<2>, and a phosphor coat 4 on the coat 3. As a result, the generation of a coloring event can sharply be suppressed during life span and luminous flux maintability can be improved by using the protective coat 3 that is comprised with alumina and antimony.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-pit start type fluorescent lamp in which a transparent conductive coating is formed on the inner surface of a glass tube.

When this type of rapid-start type fluorescent lamp is lit for a long period of time, blackish brown spots appear in the mercury-attached areas, and a yellowing phenomenon occurs over the entire lamp, which seriously impairs the appearance of the lamp. In addition, there is a problem that the luminous flux maintenance rate during the service life deteriorates significantly.

As a countermeasure against this problem, it has been known to provide a protective film made of alumina between the transparent conductive film and the phosphor film. This alumina protective coating has the effect of suppressing the occurrence of coloring phenomena during the life of the lamp and improving the lamp appearance and luminous flux maintenance rate. No, it wasn't enough.

The present invention provides a rapid-start type fluorescent lamp which can further improve the luminous flux maintenance factor compared to conventional lamps.

The inventors have conducted various studies to achieve the above object, and have discovered that the luminous flux maintenance factor can be further improved by using a protective coating made of a mixture of alumina and antimony.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in Figure 1, the tube outer diameter is 32B, the tube length is approximately 1200 mm.
A transparent conductive coating 2 made of tin oxide is formed on the inner surface of a glass tube 1 of m. Then, a protective coating 3 made of a mixture of r-alumina and antimony oxide or antimony chloride mixed in an amount of 10 to 60% by weight is applied to a thickness of 0.5%.
03~/Ca on the transparent conductive film 2, and the fluorescent film 4 is formed thereon. Thereafter, a 40W rapid-start type fluorescent lamp was manufactured by the usual method. Furthermore, in the same manner, the protective coating 3
The thickness of o, os mg/cfI, o-1 mg
/ cni +0.15mg/crI and variously changed 4o
We also produced a W rapid start type fluorescent rung.

Turn on the above rabbit start type fluorescent lamp, and
Luminous flux φ1° after lighting for an hour. Luminous flux φ1° after lighting for 0 and 100 hours. When the luminous flux ratio (1000 hour luminous flux maintenance rate) was measured, the results shown in curve A in FIG. 2 were obtained. In the figure, song #JB is for a conventional rabbit-start type fluorescent lamp using an alumina protective coating.

As is clear from FIG. 2, the rapid-start type fluorescent lamp of the present invention has a higher luminous flux maintenance rate than the conventional rapid-start type fluorescent lamp, and the conventional type has a lower protective coating thickness. It can be seen that, while the luminous flux maintenance factor does not change almost regardless, the present invention also has the effect that the luminous flux maintenance factor improves as the thickness of the protective coating increases.

As explained above, the present invention can provide a rapid start type fluorescent lamp that can improve the luminous flux maintenance factor compared to the conventional one.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of a rapid start type fluorescent lamp according to an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the type and thickness of the protective coating and the luminous flux maintenance factor. DESCRIPTION OF SYMBOLS 1... Glass tube, 2... Transparent conductive coating, 3... Protective coating, 4... Fluorescent coating.

Claims (1)

[Claims] A transparent conductive coating is formed on the inner surface of the glass tube, a protective coating made of a mixture of alumina and antimony is formed on the transparent conductive coating, and a phosphor coating is further formed on the protective coating. A rapid start type fluorescent lamp.