JPS61156628A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To eliminate inrregular flickering even after the lighting time is over by keeping the length of a rod type auxiliary electrode extruded in the discharge side from an electrode filament, distance between the end point of auxiliary electrode and the internal wall of a glass bulb and an internal diameter of the bulb in the specified relation. CONSTITUTION:The lead wires 3, 3 are implanted to a stem 2 sealed to the end portion of a glass bulb 1 at which internal surface the phosphorus film is deposited. An electrode filament 4 of tangusten coil is connected to the end portion of these lead wires 3, 3. Moreover, both lead wires 3, 3 are provided with rod type auxiliary electrodes 5, 5 by electrical welding. When, a length of electrode 5 extruded to the discharge side from the center axis of filament 4 is defined as h mm, distance of filament 4 extruded to the external side of lead wire 3 from the end portion 6 as a mm, the electrode 5 is formed within the range, h>=4, 0 <a/h<=0.6. Moreover, the end point 7 of electrode 5 is in the relation 0.2 <=L/D<0.5, when an internal diameter of bulb 1 is defined as D mm, and distance between the end point 7 and internal wall of bulb 1 as L mm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fluorescent lamp in which irregular flickering is prevented by improving the structure of a discharge electrode.

[Technical background of the invention and its problems]

When a fluorescent lamp is operated with alternating current, fluctuations in light may be felt mainly at the end of the tube-shaped glass bulb of the fluorescent lamp. Such light fluctuations, or flickering, include regular flickering that occurs in response to the frequency of the fluorescent lamp's AC power supply, and irregular flickering that fluctuates irregularly regardless of the frequency. Flickering causes discomfort to the user. It is known that this irregular flickering occurs when the anode vibration in a fluorescent lamp repeats irregular occurrences and disappearances. In particular, irregular flickering occurs when a fluorescent lamp is turned on for about 1,000 hours. There was a tendency to become fickle.

In the discharge electrode of a conventional fluorescent 2 lamp, the electrode filament of a tungsten coil is connected to a lead wire planted in the stem, and an electron emitting material is coated in the center of the tungsten coil filament, leaving the ends of the tungsten coil filament. When this discharge electrode becomes an anode, one end of the tungsten coil filament to which the electron emitting material is not coated and one of the grid wires capture electrons flying from the cathode.

Since the electron emitting material of the discharge electrode is lit by a fluorescent lamp, it becomes difficult to focus the electron flow on only one part of the anode to generate stable anode vibration.

Therefore, it is thought that irregular occurrence and disappearance of anode vibration becomes more likely to occur.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems of conventional fluorescent lamps, and is capable of stabilizing the anode vibration even after 2 lighting hours have elapsed. To provide an improved fluorescent lamp which does not cause irregular flickering that can occur over time and therefore does not give discomfort to a user.

[Summary of the invention]

The present invention provides rod-shaped auxiliary electrodes on both of two lead wires that support electrode filaments of a mount sealed at both ends of a glass bulb whose inner surface is coated with a phosphor coating. The length of the protrusion toward the discharge side is h (crane), and the distance from the end of the IL polar filament protruding outside the lead wire to the auxiliary electrode is a (s).
+m), the distance between the tip of the auxiliary electrode and the inner wall of the glass bulb is L (tomo), and the inner diameter of the glass bulb (M), h≧4.0≦a/h≦0.6. 0.2≦L/D<0.
This fluorescent lamp is characterized by having five relationships.

[Embodiments of the invention]

The details of the invention will now be described with reference to an embodiment of the invention shown in the accompanying drawings.

FIG. 1 is a cutaway front view of a part of the glass bulb of an embodiment of the fluorescent lamp of the present invention. Glass bulb (1)
The phosphor coating deposited on the inner surface of the stem and the exhaust pipe of the stem are omitted from illustration.

A stem (2) sealed to the end of the glass bulb (1)
) are planted with lead wires (3) and (3). An electrode filament (4) of a tungsten coil is connected to the ends of the above wires (3) and (3).

The polar filament (4) is shown with the coil portion omitted.

Rod-shaped auxiliary electrodes (5), (5) are attached to both of the two lead wires (3), (3) by, for example, electric welding.

In the present invention, the rod-shaped auxiliary electrode (5) is an electrode filament (4).
The length h (III) protruding from the central axis to the discharge side, '#
The distance from the outwardly protruding end (6) of the lead wire (3) of the polar filament (4) to the auxiliary electrode (5) K is a(l)
When Il), an electrode within the following range is constructed.

In other words, h≧4 mm O≦a/h≦0.6 ◇Then, the tip of the electrode (5) @ (7) is the glass bulb (
KO6 when the inner diameter of 1) is D (u+) and the distance between the tip (7) and the inner wall of the glass bulb (1) is L (mm).
2≦L/D<0.5.

The present inventors used a fluorescent lamp FL20SS/18 to test the occurrence of flickering during 1A00 hours of lighting.

In the test, the length h of the Yuzen-shaped auxiliary electrode (5) protruding toward the discharge side was varied from 1 m to 15 m.

The ratio a/h of the distance a (m) from the outwardly protruding end (6) of the lead wire (3) of the electrode filament (4) to the auxiliary electrode and the above h (cod) is varied from O to IB. , and the distance L between the tip (7) of the auxiliary electrode (5) and the inner wall of the glass bulb (1) and the inner diameter D of the glass bulb (1).
(mm2) was varied from 0.1 to 0.6, and 100 fluorescent lamps were manufactured and tested for each combination. Note that the outer diameter of the rod-shaped auxiliary electrode was 0.6111. The results are shown in the table below. Those with no flickering after 1,000 hours of lighting were indicated as 09, those with an occurrence rate of 1% or less, and those with a Δ9 occurrence rate of more than 1% were indicated as X.

As is clear from the above table, the length h (gm) of the rod-shaped auxiliary electrode protruding toward the discharge side is 41 or more, and a/h is O.
Or Q, 5. It was found that flickering did not occur after lighting for 1,000 hours when the L/D was 0.2 to 0.5. Among these, when L/D is 0.5, the rod-shaped auxiliary electrode can be bent to prevent the tips from colliding, but since there is a risk that the tips may come into contact, it was excluded.

Further, h (mm) seems to be limited to about 20 mm from the viewpoint of manufacturing the fluorescent lamp and the efficiency of the lamp.

From the above results, the length h (ms) of the rod-shaped auxiliary electrode used in the present invention that protrudes toward the discharge side must be sufficiently long, and the length a (ix It was found that it is not preferable for ) to be too long compared to the above h (home), and that the above a(ii) may be O.

Figures 2 to 4 show electrodes of other embodiments different from the embodiment shown in Figure 1 of the electrode used in the present invention, and the same parts as in Figure 1 are given the same reference numerals. This is an indication.

The present inventors have confirmed that even if there are 16 electrodes in FIGS. 2 to 4, as long as a and h shown in the figure are within the range of the present invention, it is possible to obtain a fluorescent lamp that does not cause flickering. In other words, Fig. 2 shows an example in which the lead wire and rod-shaped auxiliary electrode shown in Fig. 1 are integrated, Fig. 3 shows an example in which the rod-shaped auxiliary electrode is provided inside the lead wire, and Fig. 4 shows an example in which the rod-shaped auxiliary electrode is provided inside the lead wire. This is an example in which a rod-shaped auxiliary electrode with a bent configuration is attached.

Both a and h as indicated in the respective figures can be present within the scope of the present invention.

According to the invention of the present inventors, in the electrode used in the fluorescent lamp of the present invention, the tip of the rod-shaped auxiliary electrode is disposed at a distance of 4H or more from the electrode filament toward the discharge side, and furthermore, the tip of the rod-shaped auxiliary electrode is located at a distance of 4H or more from the electrode filament toward the discharge side. The length of the electrode coil filament is short, and the tip of the auxiliary electrode is isolated from the inner wall of the glass bulb, so that the electron flow is reliably focused at the auxiliary electrode during discharge of the fluorescent lamp.

It is thought that flickering of the fluorescent lamp could be prevented because the anode vibration could be generated stably without unstable movement of the electron flow focusing point due to consumption of the electron emitting material of the electrode.

〔Effect of the invention〕

As described in detail above, the present invention provides rod-shaped auxiliary electrodes on both of the two lead wires that support the electrode filaments of the mount sealed at both ends of the glass bulb whose inner surface is coated with a phosphor coating. The length of the rod-shaped auxiliary electrode protruding from the electrode filament to the discharge side is h (gm), and the distance from the tip of the electrode filament to the auxiliary electrode when the electrode filament protrudes outside the lead wire is a (gm), and the tip of the auxiliary electrode is The distance to the inner wall of the glass bulb is L (ms), and the inner diameter of the glass bulb (xi
), h≧4+n, O≦a/h≦0.6.0.
This fluorescent lamp is characterized by having the relationship of 2≦L/D<0.5, and because it can reliably generate stable anode vibration, The present invention has the advantage that it is possible to provide the industry with a fluorescent lamp with excellent characteristics, which can prevent irregular flickering that often occurs after being lit for about 1,000 hours.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view of a part of the glass bulb of an embodiment of the fluorescent lamp of the present invention, and FIGS. It is a front view showing an example. l...Glass bulb, 3...Lead wire. 4... Electrode filament, 5... Rod-shaped auxiliary electrode Patent attorney Kensuke Chika (and 1 other person)

Claims (1)

[Claims] Rod-shaped auxiliary electrodes are provided on both sides of two lead wires that support electrode filaments of a mount sealed at both ends of a glass bulb whose inner surface is covered with a phosphor coating, and the rod-shaped auxiliary electrodes are connected to the discharge side from the electrode filaments. Let h(
mm), the distance from the end of the electrode filament protruding outside the outer wire of the lead wire to the auxiliary electrode is a (mm),
The distance between the tip of the auxiliary electrode and the inner wall of the glass bulb is L (mm
), h≧ when the inner diameter of the glass bulb is D (mm)
4. A fluorescent lamp characterized by having the following relationships: 0≦a/h≦0.6, 0.2≦L/D<0.5.