JPH0963536A - Electrode for fluorescent lamp, and fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode for a fluorescent lamp, that does not reduce the lamp life even when the number of times of lamp blinks is increased, and a fluorescent lamp using the same by reducing the time required for a multiple coil filament and an electron emitting material to reach normal operating temperatures, i.e., sputtering time. SOLUTION: In order to quickly raise the temperature of an electron emitting material, one multiple coil filament 1 is provided with a plurality of most wound parts 12. Also, both end legs 11, 11 of the filament 1 and a leg 11' provided between the most wound parts 12 are pinched by support wires 3, 3' embedded in a stem 2 so as to enhance the vibration resistance of the electron emitting material to prevent the material from dropping. Further, the filament 1 pinched by the support wires 3, 3' is installed in such a way that it surrounds the centerline of the stem so that it can be mounted even in a fine tube lamp.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electrode for a fluorescent lamp and a fluorescent lamp using the electrode.

[0002]

2. Description of the Related Art In general, the life of a fluorescent lamp is determined by the fact that the electron emissive material deposited on the tungsten multi-coil filament is scattered, evaporated and consumed at the time of starting and operating the lamp.

As the multi-coil filament, a double-coil filament, a so-called triple-coil filament in which a thin wire is loosely wound around the double-coil filament, or a block-coil filament in which a coil is triple-wound, has been put into practical use.

As the electron emitting material, alkaline earth metal (barium, containing several wt% of zirconium oxide) is used.
A complex oxide of strontium and calcium) is used, and as a result of various improvements in recent years, for example, FL
10, the rated life is 6,000 hours, FL20SS is 8,500 hours, FL40SS, FLR40S is 1
2,000 hours have been obtained.

[0005]

However, from the viewpoint of resource saving and environmental pollution (emission of mercury contained in the lamp tube) in recent years when global environmental problems are becoming apparent, the rated life of the above fluorescent lamp is , I can't say that I have reached a satisfactory level.

By the way, the life of the fluorescent lamp is shortened when the number of times of blinking is large, because the electron emissive material is consumed more at the time of starting the lamp than during the lighting. Generally, it is said that one blinking shortens the life by about 30 minutes to 1 hour and 30 minutes.

This is because the multi-coil filaments attached to both ends of the fluorescent lamp have a certain amount of heat capacity, so that the high emissivity of the electron emissive material is maintained until the normal operating temperature for thermionic emission is reached. This is because the electron emissive material is scattered and consumed by so-called sputtering due to ion bombardment due to the drop voltage. Of course, the multi-coil filament is also damaged by the spatter, and in the worst case, the wire breaks.

The scattered electron emissive material and the coil cause blackening of the tube wall, reduction of luminous flux, etc., which also causes a shortening of the lamp life.

The present invention has been made to solve the above problems, and an object of the present invention is to shorten the time required for the multi-coil filament and the electron emitting material to reach a normal operating temperature, that is, An object of the present invention is to provide an electrode for a fluorescent lamp and a fluorescent lamp using the electrode, in which the life of the lamp is not shortened even if the number of blinks is increased by shortening the sputtering time.

[0010]

In order to solve the above-mentioned problems, the present invention is characterized in that one multi-coil filament is provided with a plurality of maximum winding portions in order to quickly raise the temperature of the electron emissive material. It is what

Further, the both end legs of the multi-coil filament having a plurality of most windings and the legs provided between the most windings are pinched and fixed to the respective support wires embedded in the stem, so that the electron emissivity is increased. Improve the earthquake resistance of the material,
It is intended to prevent the falling.

Further, the multi-coil filament having a plurality of maximum winding portions pinch-fixed to the support wire is arranged so as to surround the stem center line, so that it can be mounted on a thin tube lamp.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.

(Embodiment 1) FIG. 5 shows a typical conventional structure of an electrode portion of a fluorescent lamp. In the figure, 1 is a multi-coil filament, and its leg parts 11, 1
1 is pinch-fixed to support wires 3 and 3 embedded in a glass stem 2.

FIG. 1 shows the structure of an electrode portion according to the first embodiment of the present invention. The multiple coil filament 1 is formed with a plurality of maximum winding portions 12, 12. The leg portions 11 and 11 are pinch-fixed to the support wires 3 and 3 embedded in the glass stem 2 as in the conventional structure. In addition,
The electron emissive material is deposited on the entire area of the filament except the legs 11, 11. In addition, the multi-coil filament 1 has substantially the same electrical characteristics as those of the conventional structure in order to satisfy the compatibility of the lighting circuit.

The inner diameters and the pitches of the plurality of most winding portions 12 according to the present invention are designed to be smaller than those of the conventional one, and when starting with the same lighting circuit, the temperature of the most winding portion 12 having a high coil density rises quickly. Therefore, as shown in FIG. 2, the time required to reach the operating temperature of the electron emissive material, that is, the emission start temperature is shortened. Moreover, since the maximum number of winding portions 12 is plural, the probability of existence of the portion reaching the emission start temperature increases. As a result, the amount of spatter is reduced, and damage to the coil and the electron emissive material due to ion bombardment is reduced.

The results of the short-term blinking life test of 10 seconds on / 50 seconds off are as follows. The lamp used in the test was FL40SS, and the ballast used was a dedicated inverter ballast. Further, the following numbers are the average number of times of blinking until the 10 lamps are turned off.

The electrode of the present invention: 43,300 times The electrode of the conventional example: 16,500 times As described above, when the electrode according to the present invention is used, a blinking life of 2.5 times or more that of the conventional one can be obtained. I understand. Further, as the multiple coil filament, since the above-mentioned double coil filament, triple coil filament and block coil filament can be applied to the present invention,
It can be said that the application range of the present invention is wide.

In this embodiment, the example in which the maximum number of winding portions 12 is two has been described, but it goes without saying that three or more winding portions can be formed.

(Embodiment 2) In the electrode according to the present invention, since the total length of the multi-coil filament is relatively long, the vibration of the coil tends to be large. In order to prevent the vibration of the coil, the present embodiment, as shown in FIG. 3, has both end legs 11 and 11 of the multi-coil filament 1 having a plurality of most winding parts 12, 12 and the most winding part 12, The leg 11 ′ provided between 12 and the supporting lines 3, 3,
It is pinched to 3 '.

By thus fixing the intermediate portion of the multi-coil filament 1 by the support wire 3 ', the vibration of the coil is prevented, and as a result, the seismic resistance of the electron emissive material can be improved and the emissive material of the electron emissive material can be improved. It was possible to prevent falling off.
The effect of preventing the emissive substance from falling off is high, and in the lighting life test defined by JIS, the lighting life of FL40SS was about 1.5 times longer than that of the case where the conventional electrode was mounted.

(Embodiment 3) As described in Embodiment 2, the electrode according to the present invention has a relatively long total length of the multi-coil filament. There is a problem that it cannot be inserted.

In order to ameliorate this problem, this embodiment has a plurality of maximum number of windings pinched to three supporting wires 3, 3, 3 ', as shown in FIGS. 4 (a) and 4 (b). Part 12,
By arranging the multi-coil filament 1 having 12 so as to surround the center line of the stem 2, the coil size can be substantially reduced, and the filament can be mounted on a thin tube lamp. In addition, what is shown in FIG.
FIG. 4B shows an example in which the maximum number of winding portions 12 is two, and FIG.

[0024]

As described above, according to the present invention, since a plurality of multi-winding portions are provided in one multi-coil filament, the temperature of the multi-winding portion having a high coil density rises quickly, and as a result, the operation of the electron emissive material is increased. Temperature, that is, the time to reach the emission start temperature is shortened, spatter is reduced,
It is possible to reduce the damage to the coil and the electron emissive substance due to ion bombardment, and since the maximum number of windings is provided, it is possible to provide an electrode for a fluorescent lamp that increases the probability of starting with less damage.

Further, the both ends of the multi-coil filament having a plurality of multi-winding parts and the legs provided between the multi-winding parts are pinch-fixed to the respective support wires embedded in the stem, whereby the multi-coil is formed. It is possible to prevent the vibration of the filament, improve the earthquake resistance of the electron emissive material, and prevent it from falling off. As a result, it was possible to obtain a fluorescent lamp with a long life, which has a flashing life that is 2.5 times longer than that of conventional fluorescent lamps.

Furthermore, by arranging the multiple coil filaments having a plurality of maximum winding portions pinched and fixed to the support wire so as to surround the stem center line, it becomes possible to mount the thin tube lamp, and the application range of the present invention is applied. I was able to spread it.

[Brief description of drawings]

FIG. 1 is a front view showing an electrode portion of a first embodiment according to the present invention.

FIG. 2 is a diagram showing characteristics of filament temperature.

FIG. 3 is a front view showing an electrode portion of a second embodiment according to the present invention.

FIG. 4 is a top view showing an electrode portion of a third embodiment according to the present invention.

FIG. 5 is a front view showing a structure of an electrode portion of a conventional example.

[Explanation of symbols]

 1 Multiple Coil Filament 2 Glass Stem 3 Support Wire 11 Leg 12 Maximum Winding

Claims (3)

[Claims] 1. An electrode for a fluorescent lamp, wherein one multi-coil filament is provided with a plurality of most winding portions. 2. A fluorescent lamp provided with the electrode according to claim 1, wherein both end legs of the multi-coil filament having the plurality of most winding portions and a leg portion provided between the most winding portions are provided on a stem. A fluorescent lamp characterized by being pinched to each embedded support line. 3. The fluorescent lamp according to claim 2, wherein the multi-coil filaments are arranged so as to surround a center line of the stem.