JPS5885265A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To facilitate the initiation of electric discharge, and prevent any generation of blackening of the ends of a fine tubular glass bulb by charging the bulb with Ar gas at a specified pressure, and using as an electrode a W-coil formed by coiling a W-filament around which a W-fine-wire is loosely wound. CONSTITUTION:Ar used as a discharge-facilitating gas is charged in a glass bulb 1 with an outer diameter of 24.3-26.7mm. at a pressure of 1.5-2.5Torr. A W- coil 10 is formed by coiling a W-filament 9 around which a W-fine-wire 8 is loosely wound. Such a W-coil 10 is prepared by situating a mandrel made of Mo or the like parallel to the W-filament 9 to make a mandrel, winding the W-fine- wire 8 around thus made mandrel, and winding this around another mandrel, being followed by dissolving Mo by use of solution. As a result, the initiation of electric discharge is facilitated, stabilization of the total luminous flux can be accelerated, and blackening of the ends of the bulb 1 can be prevented.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a fluorescent lamp, and more particularly to an improvement in the structure of a fluorescent lamp that makes it possible to improve the characteristics of a power-saving fluorescent lamp using thin tube glass pulp.

Technical Background of the Invention In recent years, resource and energy conservation has become an issue, and capillary fluorescent lamps such as 200V40W fluorescent lamps that use glass pulp with an outer diameter of 25.5 ± 1.2 mm have become popular. has been developed. In this type of fluorescent lamp, a gas in which krypton t or xenon having a large atomic weight is mixed with argon is sealed together with mercury in a glass bulb as an easily dischargeable gas. The reason for sealing the above gas with a relatively large atomic weight is that since the electrode is composed of a double coiled tungsten filament, the length of the fill becomes long, and because the diameter of the glass pulp O is small, the glass pulp near the electrode and the electrode This is to prevent blackening, which tends to occur at the edge of the glass pulp near the electrode due to the small distance between the two electrodes.

Problems with the Background Art As described above, a fluorescent lamp made of 8KO glass pulp with an outer diameter of 25.5 m and using a double-coiled tungsten coil filament uses an easily dischargeable gas made of a mixture of xenon and argon in Libton. Since it is a thin tube, less glass material is required, and light efficiency is also increased.
Although it has the advantage of being large at 1 m/W, it is difficult to start discharging the fluorescent lamp when the ambient temperature drops.
This has the disadvantage that it is easy to clean, and it takes a long time for the total luminous flux of the fluorescent lamp to stabilize after lighting. The reason for this is that krypton and xenon are used, which have 2 to 3.3 times the atomic weight of argon, which is the filler gas in conventional fluorescent lamps, and have low thermal conductivity. The energy level of krypton and xenon in the metastable state is lower than the ionization voltage of mercury, so the shevening effect is less likely to occur than when argon and mercury are used. It seems that starting a discharge, especially at low temperatures, is difficult.

Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks.In an energy-saving fluorescent lamp using a thin tube of glass pulp, the discharge is easy to start, the total luminous flux is quickly stabilized, and the blackness at the edge of the glass pulp can be reduced. The object of the present invention is to provide an improved fluorescent lamp that does not cause any oxidation.

Summary of the Invention The inside of the capillary-shaped glass bulb contains 1.5 torr to 2 torr.
,! This is a fluorescent lamp in which a tungsten filament is sealed with argon, and a thin tungsten wire is wound around the tungsten filament.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be explained with reference to an illustrated embodiment. Figure 1 is a partially cutaway front view of a fluorescent lamp according to an embodiment of the present invention. The outer diameter is 25.5■±1.2■.

That is, 24.3 to 26.7 m of glass pulp (
1) has a phosphor coating (2) applied to its inner surface, and an electrode (3) having an electron radioactive material applied to both ends of the glass pulp (1) is introduced into the stem (5) by internal introduction M (4L).
) is supported. The internal lead-in wire (4) is conductively led out of the glass pulp (1) and connected to pins (7), (7) of the pace (6). Glass pulp (1
) is filled with mercury and easily dischargeable gas, and the glass pulp (1) is hermetically sealed. FIG. 2 is a partially cutaway enlarged sectional view of the electrode used in the fluorescent lamp according to the embodiment of the present invention shown in FIG. 1, and shows the state before the electron radioactive material is deposited. The loosely wound tungsten filament (9) is further wound around the thin tungsten wire (8) to form a tungsten coil αυ. To manufacture a tungsten coil (1 (I) having such a structure, a mandrel made of molybdenum (not shown) is installed in parallel with the tungsten filament (9), and a thin tungsten wire is wound using both as mandrels. The tungsten coil aI is formed by winding the tungsten filament (9) in which the thin tungsten wire (8) is further wound around the loosely wound tungsten filament (9).
I'm going to cut it.

Next, the results of experiments conducted by the present inventor will be described.

The inventors manufactured and experimented with fluorescent lamps using the electrodes used in the present invention and conventional double-coil electrodes. The specifications of the above electrode are shown in the table below.

table The specifications shown in the table above are shown in Figure 2.

A 200 V 40 W fluorescent lamp was manufactured using glass pulp having an outer diameter of 25.5111 mm using electrodes having the specifications shown in the above table coated with an electron radioactive material. The easily dischargeable gas sealed in the glass pulp was only argon, and the pressure was varied from 1 torr to a torr (test numbers! to ■).

In the conventional double coil electrode shown in the table above, the easily dischargeable gas sealed in the glass pulp is a rare gas mixture of 60% by volume of argon and 40% by volume of krypton, and the sealed pressure is 1.8.
The luminous flux maintenance rate and degree of blackening of the glass pulp wall were tested when a fluorescent lamp was turned on using a torr O type (test number ■). Regarding the degree of occurrence of blackening, 100 points are those with no blackening at the edges of the glass pulp of the fluorescent lamp, and 100 points are those with no blackening at the edges of the glass pulp.
Scores were given as 10 points for those that exceeded α. For example, 90 points are for glass pulp with blackening that cannot be seen unless you look carefully at the edge of the glass pulp, 80 points are for blackening that is noticeable by looking at the edges, and 80 points are for glass pulp that has blackening that is noticeable only by looking at the edges, and 80 points are for glass pulp that has blackening that is noticeable only when looking closely. 70
It was marked as a point. The average value of 30 lights for each test number is υ, and the luminous flux maintenance rate (%) is shown in Table 1 and Figure 3 below.
Table 2 and FIG. 4 show the degree of blackening occurrence (points).

(Margin below) Table 1 Table 2 In Figures 3 and 4, the horizontal axis shows the lighting time (hours) of the fluorescent lamp, and the vertical axis shows the third [! il is the luminous flux maintenance rate (%), and FIG. 4 is a characteristic diagram showing the degree of blackening occurrence (points). The numbers attached to the curves in the above figure correspond to the clothing test numbers. Table 1 and Figure 3, Table 2 and 4 above
As is clear from the results in the figure, the easily dischargeable gas enclosed is 100% by volume of argon, and the enclosed pressure is 1,0 torr.
The ones (tests, @ numbers ■～■) have a luminous flux maintenance rate of 85.5% after 3,000 hours, and the conventional ones (with 60 volume% argon and 40 volume% krypton and a sealing pressure of 1.8 torr) No improvement in altitude was shown compared to test number ■).

In addition, the incidence of blackening is 3. Score is 80 in OO'O time
It is better than the conventional test number ■, but the darkening is severe. However, it was found that when 100% by volume of argon was used and the sealing pressure was 1.5 terr or more, good results were obtained in both the luminous flux maintenance rate and the degree of blackening.

Next, the inventor incorporated the fluorescent lamp under test into a lighting circuit using a conventional lighting tube, and the ambient temperature of the fluorescent lamp was adjusted to 5.
The time required for the luminous intensity of the fluorescent lamp to stabilize at ℃ and the probability of lighting the fluorescent lamp after the switch was closed were tested. The results are shown in Table 3, Figure 5, and Table 4 below.

Table 3 and Figure 5 show the luminous intensity value of 1 when the luminous intensity is stable.
00 indicates the change in luminous intensity value depending on the lighting time after the switch is closed (in minutes), and the dream 5 diagram shows the lighting time (minutes) on the horizontal axis, and the change in luminous intensity value on the vertical axis, i.e. It is a characteristic curve diagram showing specific luminous intensity (%). Further, Table 4 shows the number of fluorescent lamps lit according to the time (seconds) after the switch was closed.

(Left below) When the easily dischargeable gas in a fluorescent lamp is 100% argon by volume, and the filled gas pressure is 31 off, it takes 4 minutes for the luminous intensity to stabilize at a low temperature of 5°C.

Even though the conventional gas mixture of 60% by volume of argon and 40% by volume of krypton is sealed at 1.8 torr, the time required for stabilizing the luminous intensity is shorter than 5 minutes, which is not preferable. When the gas pressure was 2.5 torr or less at 100% by volume of argon, the time required for the luminous intensity to stabilize was 3.5 minutes or less. Also, as is clear from Table 4, the ambient temperature 5
The time it takes for a fluorescent lamp to turn on after the switch is closed at ℃ is within 6 seconds when the charged easily dischargeable gas is 100% by volume argon in 50 tests for each test number when the filled pressure is 2.5 torr or less. All 50 lights turned on, but the ones with a sealing pressure of 3 torr took 8 seconds, and the ones with the conventional mixed gas of argon and krypton lit up within 10 seconds, and the ones that required more than 10 seconds lit up. There were six of them, showing a significant difference.

From the above experimental results, the outer diameter of the glass pulp is 24.311
1 to 26.7 In the proverbial thin tube fluorescent lamp, a tungsten coil as shown in FIG. 5
The fluorescent lamp of the present invention sealed at a sealing pressure of 2.51 to 2.51 orr shows little decrease in luminous flux over a lighting time of 3,000 hours.

Excellent results: less blackening occurs, the luminous intensity stabilizes for less than 3.5 minutes after the switch is closed, and the lighting can be turned on within 6 seconds after the switch is closed/off. was gotten. 9. The present inventor has developed a tungsten coil, which is referred to as a triple coil by those skilled in the art, as an electrode to be used in the fluorescent lamp of the present invention, that is, a tungsten filament in which a thin tungsten wire is loosely wound and then re-wound. Turned tungste/
Similarly to the above embodiment, the coil also has a ratio of 1.5 to 2.
By newly introducing 5 torr of argon as an easily dischargeable gas, excellent results were obtained in terms of luminous flux maintenance rate, degree of blackening, and luminous intensity stabilization time of 2 seconds.

Effects of the Invention As detailed above, the present invention has an outer diameter of 24.3 to 2.
6.7 m long, comprising glass pulp coated with a phosphor coating on the inner surface, electrodes coated with an electron radioactive substance at both ends, and sealed with mercury and easily dischargeable gas, the above-mentioned Easily dischargeable gas is 1.5 torr to 2.5 torr
A fluorescent lamp characterized in that the upper electrode is a tungsten coil formed by winding a tungsten filament loosely wound with a thin tungsten wire, or winding the tungsten filament again after being wound. Unlike fluorescent lamps that use glass pulp with an outer diameter of 25.5 W ± 1.2 yen, it does not use an easily dischargeable gas such as krypton or xenon mixed with argon, and therefore the discharge starts. , 1! # It is not difficult to start discharge at low temperatures, and because the electrode uses a tungsten coil with the above configuration, blackening of the glass pulp end does not occur as with conventional double coil filament. There are few.

Moreover, it has excellent effects such as easy lighting and good luminous flux maintenance rate. Furthermore, since it does not use expensive rare gases such as krypton and xenon, it can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a fluorescent lamp according to an embodiment of the present invention, FIG. 2 is an enlarged partially cutaway sectional view of an electrode used in the fluorescent lamp according to an embodiment of the present invention shown in FIG. The figure shows a characteristic curve with the lighting time of a silkworm lamp on the horizontal axis and the luminous flux maintenance rate on the vertical axis. Figure 4 shows a characteristic curve with the lighting time of a fluorescent lamp on the horizontal axis and the degree of blackening on the vertical axis. Figure 5 is a characteristic curve diagram in which the horizontal axis represents the lighting time (minutes) after the switch of the lighting circuit is closed, and the vertical axis represents the specific luminous intensity. l...Glass pulp, 2...phosphor coating, 3...Φ
・Electrode, 8... φ tungsten thin wire, 9... Tungsten filament, 10... Tungsten coil Agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 1 ---- Lighting time (hours) Figure 5-11 - Lighting time (minutes)

Claims (1)

[Claims] It has an outer diameter of 24.3 m to 26.7 m, has an electrode coated with an electron-discharging substance at both ends of a glass pulp coated with a phosphor coating on the inner surface, and mercury and an easily dischargeable electric body are made of glass pulp. In the case where the easily discharged electric material is argon at a pressure of 1.5 torr to 2.51 torr, the electrode is a tungsten filament in which a thin tungsten wire is loosely wound, or a tungsten filament is wound around the tungsten filament. A fluorescent lamp characterized by a tungsten coil made of a tungsten coil re-wound.