JPS62259339A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To prevent irregular flickering of a fluorescent lamp by spanning a filament coil in the direction at a right angle to the discharge path in projecting the part coated with an electrode material from the tips of lead-in wires into the discharge path to constitute the electrode. CONSTITUTION:An electrode 1 to be arranged on both end parts of a fluorescent lamp is formed in supporting a filament coil 4, whose center part 6 is coated with an electrode material 7, with two pieces of lead-in wires. Thereby, the filament coil is spanned so that its center part 6 may be in a straight line in the direction at a right angle to the discharge path and the part coated with the electrode material 7 of the coil 4 is arranged so as to be projected into the discharge path from the tips Z of the lead-in wires 3. Further, the center part 6 of the coil 4 is made to be at the shortest distance from the opposing electrode, and electrons are made to flow into this part with an extremely high probability in an anode cycle. Accordingly, the anode working point can be effectively fixed so as to prevent the occurrence of irregular flickering.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a fluorescent lamp.

[Conventional technology]

Fluorescent lamps produce irregular flickering in the center of the lamp when turned on with alternating current. This "irregular flickering" of fluorescent lamps means that, as described in Japanese Patent Application Laid-Open No. 14740/1983, when fluorescent lamps are lit in alternating current mode, the lighting time changes depending on the power supply frequency. This refers to flickering that occurs irregularly in the center of the lamp.

In other words, when observing the lamp voltage waveform of a fluorescent lamp with such irregular flickering, as shown in Figure 6, at the initial stage of lighting, anode oscillations can be seen in the entire waveform of one cycle, but after lighting As the temperature progresses, as shown in Figure 7, the anode oscillations appear and disappear irregularly, which causes the lamp current to fluctuate, causing the light output to fluctuate as well. This refers to what is perceived as an unpleasant flicker to the eyes.

Therefore, as a countermeasure against this irregular flickering, the above-mentioned Japanese Patent Application Laid-Open No. 14740/1983 proposes a method based on the viewpoint that the irregular flickering mentioned above is caused by poisoning of the electrodes by impure gas. We have proposed an improved electrode structure as shown. That is, an auxiliary anode (8) electrically connected to the lead-in wire (3) is provided, and the distance glL from the axial center of the filament coil (4) to the tip of the auxiliary anode (8) and this distance By specifying the surface area S of the auxiliary anode (8), electrons are allowed to flow into the entire distance gllL portion of the auxiliary anode (8), thereby suppressing poisoning of the electrode (1).

In other words, the above specified auxiliary anode (8) is added to the electrode (1) of a normal fluorescent lamp. Furthermore, (9)
is a glass bulb, (1G) is a phosphor layer, and (11) is a cap. As a result, as shown in Figure 8, the lamp voltage waveform spans the entire range, and the anode vibration is liP! Moreover, the anode vibration is maintained throughout its life9, and it has been confirmed that it is effective against irregular flickering.

[Problem that the invention seeks to solve]

However, in a fluorescent lamp having an electrode (11) having the above-described structure, as shown in FIG. It) appears, but
During the anode cycle shown in FIG. 3B, electrons flow into the auxiliary anode (8), and a positive column (I) appears on the discharge path side from the tip of the auxiliary anode (8). On the other hand, as shown in the same figure (^), even during the anode cycle, the auxiliary anode (8)
In the case of a normal electrode without a positive column (I), the end of the positive column (I) appears near the filament coil (4). In other words, the distance (l□) from the filament coil (4) to the end of the positive column (I) is relatively small, but the same distance fa (Im) in (b) is limited by the auxiliary anode (8). , (l l). Therefore, there is no light emitted near the filament coil (4) with the auxiliary anode (8), so there is a problem that flicker at the end corresponding to the power frequency increases.

Further, when the auxiliary anode (8) is provided, the lengths of the filament coil (4) and the solar light (1) are shortened as described above, resulting in a problem of lowering the luminous efficiency (1 m/w). For example, this reduction in luminous efficiency is approximately 3% in a 30 Watt annular fluorescent lamp (FCL30EX/2g).
This was a major hindrance to improving the total luminous flux value.

Furthermore, since the auxiliary anode (8) is formed from a member newly added to the electrode member of a normal fluorescent lamp, the auxiliary anode (8) 8) There was also a problem that it was disadvantageous compared to a normal fluorescent lamp that is not provided.

The present invention has been made in view of the above circumstances, and aims to provide a fluorescent lamp that suppresses irregular flickering and eliminates the above-mentioned problems that occur when using an auxiliary anode.

[Means for solving problems]

In the fluorescent lamp according to the present invention, the central part of the filament coil of the electrode is stretched in a straight line in a direction closer to the discharge path and perpendicular to the discharge path than the tip of the lead-in wire through which the filament coil is stretched. An electrode material is applied to the filament coil portion located closer to the discharge path than the tip of the lead-in wire.

[Effect]

In this invention, the central part of the filament coil, which is located closer to the discharge path than the tip of the lead-in wire, is perpendicular to the discharge path and stretched in a straight line, and the electrode material is coated all around the filament. Since the center of the coil is the shortest distance from the opposing electrode and the electrode material increases the inflow of electrons, there is an extremely high probability that electrons will flow into the center of the filament coil during the anodic cycle. Therefore, the anode operating point can be fixed on the protrusion of the filament coil toward the discharge path, and thereby irregular flickering can be substantially completely suppressed. Furthermore, since the central portion of the filament coil protrudes as a "plane" toward the discharge path, the required protrusion length is shorter than that of conventional discharge station anodes. For this reason, the positive column can be made longer than a lamp equipped with an auxiliary anode, and the rate of decline in total luminous flux can be reduced.
The flicker at the end can be made to be similar to that of a normal fluorescent lamp without an auxiliary anode.

In addition, since the structure is such that the central part of the filament coil is simply protruded, this protrusion work can be done as an extension of the normal fluorescent lamp electrode assembly work without an auxiliary anode, and requires a separate member. All the various problems caused by this can be solved.

〔Example〕

FIG. 1 is a front view of an electrode part showing an embodiment of the present invention, including a glass bulb (9), a phosphor M (10), and a cap (1).
1) is not particularly shown, but is similar to that in FIG. 2.

That is, for the electrode (1), a pair of lead-in wires (3) made of nickel material with a wire diameter of 0.6a+m are implanted in the stem (2) made of lead glass, and the tip (Z) of the lead-in wire (3) is Both ends of the filament coil (4) are supported. A filament coil (41 is a primary wound coil of tungsten wire is arranged at both ends (hereinafter referred to as the leg part (5)), and the central part is (
Hereinafter referred to as the barrel portion (6), the barrel portion (6) is formed of a secondary coil (double coil) obtained by further winding the primary coil. (
7) is the barrel part +61 of this filament coil (4)
It is an electrode material that is uniformly deposited around the entire circumference of the coil, extending from the end to the middle of the leg portion (5) (hereinafter referred to as the deposited end (T)). In this invention, an electric power a of such a configuration is used.
i (In 11, the end (T) to which the electrode material is applied, including the end of the barrel part (6) on the opposite side to the discharge path (hereinafter referred to as the lower end (Y)) is from the tip of the lead-in wire H (Z). It is located closer to the discharge path and is arranged so that the central axis (X) of the barrel portion (6) is parallel to a straight line orthogonal to the discharge path.

The forming operation of such an electrode (1) can be easily completed by simply rotating the lead-in wire (3) of a normal fluorescent lamp electrode without an auxiliary anode (8) in an outward direction relative to the lamp axis. . In the case shown in FIG. 1, the distance from the lead-in wire tip (Z) to the lower end of the barrel (Y) and the adhered end (T) is set to 1 mm by this molding operation.

Next, we will compare the inventive product constructed as described above, the conventional product shown in Fig. 2, the conventional product from which the auxiliary anode (8) has been removed (Comparative Example 1), and the barrel portion (6). Curved on the discharge path side from the lead-in wire tip position M (Z) (Comparative example 2
) and the barrel part (6) is stretched at an inclination of about 30° on the discharge path side from the lead-in wire tip position (Z) (Comparative Example 3)
) and compared their characteristics. The filament coils (4) of these samples all use 25MG tungsten wire, and have a leg diameter of 0.5 mm and a barrel diameter of 2.5 m.
m.

A double coil with a barrel part number of turns of 7 and a leg length of 5.15s+m was used. Furthermore, the electrode material (7) having the same composition was deposited on the same portion. Furthermore, the auxiliary anode of the conventional product was formed from a nickel wire with a diameter of 0.6 mm and (L) 10+am. This was the minimum length necessary to keep the irregular flicker incidence rate to substantially 0% over the lifetime. Further, all the electrodes were formed with a three-wavelength phosphor layer (10) on a glass bulb (9), and a 30W fluorescent lamp (FCL30EX128) was installed. Table 1 shows the results of these comparisons.

(Margin below) Table 1 Here, the values for each comparison item are the values under the following conditions.

(i) Irregular flicker occurrence rate is the rate at which irregular flicker occurs when the lamp reaches the end of its lifespan.
This was done by lighting one lamp in a dark room and visually determining the flicker in the center of the lamp, excluding the flickering parts at the edges. For each sample, 30 pieces were prototyped, and 5 pieces were made.
The values are shown based on a total of 300 samples that were repeated several times.

(ii) The initial lighting luminous flux value is expressed relative to the average value of 15 lamps obtained by repeating 5 repetitions of 3 lamps each, with the time average value of Comparative Example 1, which is a defect, as 100%.

(iii) The end flicker is the ratio of light emitted at the end of the tube where the difference between the light emitted from the anode cycle and the cathode cycle is the largest, and the lamp was lit at 50H2, where end flicker is a problem. This is the value for a total of 15 times, 5 times, 3 times each. Practically speaking, if this value is about 70% or more, no discomfort will be felt.

From the above, we can understand the following.

(i) Regarding irregular flickering, the product of this invention is equivalent to the conventional product provided with an auxiliary anode, and the suppressing effect is more remarkable than that of other products.

(ii) The luminous flux value at initial lighting decreases by about 3% when an auxiliary anode is attached compared to when it is not attached, but in the case of the device of this invention, the decrease is only about 1%.

However, as described in detail of this invention, the lead-in line (3
) Since this invention is assembled by rotational molding of the filament coil (
Since the position 4) can be moved even further to the side opposite to the discharge path, it is possible to easily secure the desired sunlight height and obtain substantially the same value as Comparative Example 1.

(iii) The life of the product of this invention is not shorter than that of the conventional product and has been improved.

(1v) Regarding flickering at the edges, compared to the conventional product, the lighting time of the product of this invention is longer at both 0 hours and 2000 hours, and the degree of flickering at the edges is reduced.

(v) The respective characteristic values of Comparative Examples 2 and 3 are all inferior to those of the product of the present invention. This means that in the case of Comparative Example 2,
Since the barrel part (6) is not linear but curved, the pitch of the barrel part (6) is disturbed and a difference in heat capacity occurs between the outer and inner parts of the barrel part, resulting in thermal decomposition of the electrode material (7). This is thought to be due to the behavior of the electrode material (7) that is sometimes adhered to the outer circumference of the barrel portion and is not fully decomposed, and this remains undecomposed. In addition, in Comparative Example 3, in which the barrel part (6) was stretched at a certain angle so as not to be perpendicular to the discharge path, electrons were concentrated at one end of the barrel part (6) that protruded toward the discharge path. As a result, only this part continues to receive large electron bombardments throughout its life, causing scattering of the electrode material (7) and release of impurity gas due to temperature rise, which has a negative impact on cost performance. It is thought that the

On the other hand, a series of experiments conducted by the inventors revealed that there is a correlation between the position of the adhered end (T) of the electrode material (7) and the occurrence of irregular flickering. That is, in an electrode (1) having a structure in which the barrel portion (6) of a filament coil (4) protrudes toward the discharge path as shown in FIG. ! Centering on Z (Z), from the discharge path side (positive direction) to the faulty circuit side (negative direction)
In the case where the lower end position (Y) of the barrel part (6) is changed from the positive direction to the negative direction centering on the lead-in wire tip position (Z) in the case where the electrode material is applied to the end (T) which is different from each other, the lower end position (Y) of the barrel part (6) is We investigated the occurrence of irregular flickering when moving in different directions. The results are shown in Table 2.

(The following is a blank space) Table 2 The results of Table 2 are shown in figures as shown in Figs. 5 and 6.

In this way, the relationship between the occurrence of irregular flickering and the deposited end (T) of the electrode material (1) until the life of the lamp is T
It is preferable that the s-pole material deposition end position (S) be closer to the discharge path than the lead-in wire tip position (Z) as in type A;
Even if the Y-Z distance is in the negative region, even if the Y-Z distance is in the negative range, the irregular flickering will increase rapidly. In other words, the necessary conditions to substantially prevent irregular flickering over the lifespan are that the central part of the filament protruding toward the discharge path is straight, perpendicular to the discharge path, and the lowest end position (Y) is at the lead-in line. Tip position (Z
) is closer to the discharge path than the end (S) where the electrode material is applied.
It can be seen that it is necessary that the point be closer to the discharge path than the above-mentioned Z.

In the above embodiments, an FCL30EX72g type fluorescent lamp was described, but it has been confirmed that the effects of the present invention are not limited to the type B, but are also effective for other types of lamps. Matt Nibarel N (6
Although the explanation has been made regarding the filament coil (4) having a filament of 1, it is obvious that it is also effective for barrelless type (rod type) filament.

〔Effect of the invention〕

As explained above, this invention makes the central part of the filament coil linear and perpendicular to the discharge path,
By protruding so that its leading edge is located closer to the discharge path than the tip of the lead-in wire, and by positioning the end to which the electrode material is applied closer to the discharge path than the lead-in wire, it is possible to easily eliminate the need to provide a new member to the f4 pole. Advantages: The structure suppresses irregular flickering while improving the characteristics of luminous efficiency, non-lighting life, and edge flickering, and provides a fluorescent lamp that significantly improves quality and manufacturing problems. There is.

[Brief explanation of drawings]

FIG. 1 is a front view of an electrode showing one embodiment of the present invention, and FIG.
The figure is a partial cross-sectional view showing a conventional example in which an auxiliary anode is provided on the electrode.
Figure 3 is a diagram showing the discharge state to explain flickering;
Fig. 4 is a characteristic diagram showing the electrode material deposition position and the occurrence state of irregular flickering, Fig. 5 is a characteristic diagram showing the filament center position and the occurrence state of irregular flickering, and Figs. 6 to 8
The figures show the lamp voltage waveforms; FIG. 6 shows the initial stage of lighting, FIG. 7 shows the lamp after a certain period of time has elapsed, and FIG. 8 shows the case where the electrodes shown in FIG. 2 are used. In the figure, (1) is the electrode, (2) is the barrel part, and (3) is the electrode.
is the lead-in wire, (4) is the filament coil, (6) is the central part (barrel part), [71 is the electrode material, (T) is the end to which the electrode material is applied, (Z) is the tip of the lead-in wire, and (10) is the lead-in wire. It is an electrode. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] In a fluorescent lamp having electrodes at both ends, each end of which is a filament coil coated with an electrode material over the entire circumference of at least the central part, supported by two lead-in wires, the central part of the filament coil is connected in a direction perpendicular to the discharge path. 1. A fluorescent lamp characterized in that the filament coil is stretched in a straight line, and the part of the filament coil to which the electrode material is applied projects further into the discharge path than the tip of the lead-in wire.