JPH07282782A - Rapid start fluorescent lamp - Google Patents

Abstract

PURPOSE:To sharply restrain the creation of a dark brown speck during the life of a lamp and suppress the increase of start voltage. CONSTITUTION:A start auxiliary conductor 2, a protective coat 3, and a phosphor coat 4 are formed in order on the inner surface of a glass tube 1 having a pair of electrodes 5 in the inside wherein mercury and rare gas are enclosed. Concurrently, mercury quantity enclosed in the glass tube 1 is made within a range of 0.0032-0.0063mg/cm<3> to the inner volume of the glass tube 1, and the resistance value of the start auxiliary conductor 2 between two points (a) and (a) receding by 15cm respectively from both ends of the glass tube 1 is made within a range of 70-300kOMEGA.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rapid start type fluorescent lamp.

[0002]

2. Description of the Related Art A rapid start type fluorescent lamp is provided with a starting auxiliary conductor on the inner surface of a glass tube to lower the starting voltage to facilitate starting.
Another advantage is that a starter is unnecessary.

Generally, in a fluorescent lamp,
As the lighting time elapses, mercury in the glass tube is adsorbed by the phosphor film or the like to decrease, and there is a problem that the mercury vapor pressure that contributes to light emission decreases. Therefore, conventionally, as described in, for example, Japanese Patent Laid-Open No. 1-169838, in a straight tube fluorescent lamp, 0.011 mg / cm ³ relative to the inner volume of a glass tube, a compact fluorescent lamp (FD
L27) was 0.05 mg / cm ^3, and in order to prevent a defect due to a shortage of mercury vapor during the rated life, the glass tube was filled with more mercury than necessary in anticipation of the decrease.

[0004]

However, in such a conventional rapid start type fluorescent lamp, since the amount of enclosed mercury is large, excess mercury, which is not directly related to discharge, easily adheres to the inner surface of the phosphor film. . If, for example, a transparent conductive film is used as the starting auxiliary conductor, if the resistance value is low, the discharge energy in the glass tube flows into the transparent conductive film, and the transparent conductive film and mercury react with each other, and the phosphor and mercury react. There was a problem that black-brown spots were generated and the appearance of the lamp was impaired. This phenomenon can be suppressed to some extent by increasing the resistance value of the transparent conductive film, but there is a problem that the starting voltage of the lamp increases.

The present invention has been made in order to solve such a problem, and does not impair the appearance of the lamp due to dark brown spots during the rated life, and is a rapid start type in which an increase in the starting voltage is suppressed. A fluorescent lamp is provided.

[0006]

A rapid start type fluorescent lamp of the present invention has a pair of electrodes inside and a starting auxiliary conductor, a protective film and a phosphor on the inner surface of a glass tube in which mercury and a rare gas are sealed. In a rapid start type fluorescent lamp in which films are sequentially formed, the amount of mercury enclosed in the glass tube is 0.0032 with respect to the inner volume of the glass tube.
~0.0063mg / cm in the range of ^3, and the resistance value of the start assisting conductor between two points each 15cm away from both ends of the glass tube has a structure in the range of 70～300Keiomega.

[0007]

With this structure, it is possible to prevent the appearance of the lamp from being impaired during its life.

[0008]

1 is a sectional view of a rapid start type fluorescent lamp according to the present invention.

As shown in FIG. 1, 40 W according to the present invention
In the rapid start type fluorescent lamp, a starting auxiliary conductor 2, a protective film 3 and a phosphor film 4 are sequentially formed on the entire inner surface of the glass tube 1, and mercury and a noble gas are enclosed in the interior of the glass tube 1 and both ends of the glass tube 1 are sealed. The pair of electrodes 5 is provided by the stem 6 and the base 7 is provided. Glass tube 1
The internal volume of the is 950 cm ³ . A tin oxide film which is a transparent conductive film is used for the starting auxiliary conductor 2, aluminum oxide is used for the protective film 3, and three kinds of rare earth phosphors are mixed for the phosphor film 4 so that the color temperature becomes 5000K. Various fluorescent lamps were made. That is, the starting auxiliary conductor 2
As shown in FIG. 1, the resistance value of the starting auxiliary conductor 2 between two points a-a 15 cm apart from both ends of the glass tube 1 is 30, 50, 70, 100, 200, 3 respectively.
It was made to be 00 and 400 kΩ, respectively.
Argon gas of 340 Pa and mercury of 0.0084, 0.
0063, 0.0053, 0.0042, 0.0032
And 0.0021 mg / cm ³ respectively. These are the actual enclosed amounts of 8, 6 and
Corresponding to an amount of mercury of 5, 4, 3, 2 mg, which was encapsulated by an ordinary glass capsule.

Then, five fluorescent lamps each having the combination of the enclosed mercury amount and the resistance value as described above were prepared, and the number of defects caused by the decrease in mercury vapor pressure during the rated life, the degree of occurrence of the black-brown spot phenomenon, and The starting voltage was checked.

Table 1 shows the number of lamps that became defective during the rated life of 12000 hours (indicated in the "miss" column in Table 1) and the number of black-brown spots. The number of each of the latter is 0, 1, 2, 3,
The number of lamps evaluated to have a degree of occurrence of black-brown spots of 1 or more when 0 was not generated and 5 was most strongly generated was evaluated in 6 stages of 4 and 5 (in Table 1, "black""Indicated in the column").

[0012]

[Table 1]

As is clear from Table 1, when the amount of enclosed mercury is in the range of 0.0032 to 0.0063 mg / cm ³ and the resistance value is in the range of 70 to 400 kΩ, the degree of occurrence of black-brown spots is 1 or more. It can be seen that the above lamp does not occur at all during the rated life of 12000 hours. In addition, the number of defects is 0, and a lamp life of 12000 hours can be guaranteed.

FIG. 2 shows an example of the relationship between the lamp resistance value and the starting voltage of the starting auxiliary conductor, and the broken line shows the upper limit of the starting voltage standard value. From Figure 2, the resistance value is 340k.
It can be seen that the starting voltage does not exceed the upper limit of the standard value if the value is Ω or less. However, if the resistance value exceeds 300 kΩ,
The starting voltage may exceed the upper limit of the standard value, resulting in defects. If the resistance value is set to 300 kΩ or less, no defects will occur.

As described above, the amount of enclosed mercury in the glass tube is selected within the range of 0.0032 to 0.0063 mg / cm ³ and the predetermined resistance value of the starting auxiliary conductor is selected within the range of 70 to 300 kΩ. By this, 1 without causing dark brown spots
A lamp life of 2000 hours can be guaranteed, and the starting voltage can be suppressed below a specified value.

In the above embodiment, the case where the starting auxiliary conductor is formed on the entire inner surface of the glass tube has been described, but the present invention can be carried out even if the starting auxiliary conductor has a strip shape, a spiral shape or the like. Of course, you can

Further, although the above embodiment is an example in which the tin oxide film is used as the starting auxiliary conductor, the above is also applied to the case where another material that causes blackish brown spots and impairs the appearance of the lamp is used as the starting auxiliary conductor. The same effect as the embodiment can be obtained.

Further, as the protective film, in addition to the aluminum oxide alone described in the above embodiment, at least one of aluminum oxide, titanium oxide, cerium oxide and magnesium oxide can be used.

[0019]

As described above, according to the present invention, by defining the amount of enclosed mercury and the resistance value of the transparent conductive film,
It is possible to provide a rapid start type fluorescent lamp in which the occurrence of blackish brown spots can be significantly suppressed and the increase in the starting voltage can be suppressed to a predetermined value or less.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a rapid start type fluorescent lamp according to the present invention.

FIG. 2 is a diagram showing a relationship between a resistance value of a transparent conductive film and a lamp starting voltage.

[Explanation of symbols]

 1 Glass tube 2 Starting auxiliary conductor 3 Protective film 4 Phosphor film 5 Electrode

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromi Tomioka 1-1, Saiwaicho, Takatsuki City, Osaka Prefecture Matsushita Electronics Industrial Co., Ltd.

Claims (1)

[Claims] 1. A rapid start type fluorescent lamp having a pair of electrodes inside, and a start auxiliary conductor, a protective film and a phosphor film sequentially formed on the inner surface of a glass tube in which mercury and a rare gas are sealed. The amount of mercury enclosed in the tube is 0.0032 to 0.0 with respect to the inner volume of the glass tube.
The rapid start type fluorescent lamp is characterized in that the resistance value of the starting auxiliary conductor between two points 15 cm apart from both ends of the glass tube is in a range of 70 to 300 kΩ in a range of 063 mg / cm ³ .