JPH0332035Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a fluorescent lamp equipped with an auxiliary anode for preventing irregular flickering.
This invention relates to a bonding structure between the auxiliary anode and the internal lead wire.

[Conventional technology]

When a fluorescent lamp is turned on with alternating current, irregular flickering that does not correspond to the power supply frequency may occur. This is because when a fluorescent lamp is lit with alternating current, one electrode becomes an anode and the other electrode becomes a cathode, and this is repeated alternately to generate a so-called anode cycle. During such an anode cycle, electron bombardment occurs. This causes the temperature of the filament coil to rise abnormally, releasing impurity gas such as carbon dioxide contained in the electron emitting material coated on the filament coil, which decomposes and becomes carbon.
This carbon adheres to the filament coil and internal lead wire, coating the entire electrode (hereinafter referred to as poisoning), and as a result, the electrode cannot function as an anode sufficiently, resulting in irregular anode vibration. This is thought to be due to the fact that it occurs and disappears.

In order to prevent irregular flickering by protecting the electrode from electron impact during the anodic cycle, as described in Japanese Patent Application Laid-open No. 14740/1983,
Proposals have been made to attach an auxiliary anode to the electrode.

The tip of the auxiliary anode projects further into the discharge space than the filament coil, and the base end is connected to an internal lead wire and attached to the electrode. By receiving electrons during the anode cycle with this auxiliary electrode, the filament This protects the coil from electronic shock.

A conventional auxiliary electrode mounting structure will be explained based on FIGS. 4 to 8, and its problems will be described.

FIG. 4 shows a mount structure that is sealed at the end of a bulb of a fluorescent lamp (not shown), in which 1 is a stem glass; 2, 2 is a stem glass 1;
A pair of inner lead wires 3 sealed in the inner lead wires 3 is a filament coil stretched between the tip portions of the inner lead wires 2, 2. 4, 4 is an auxiliary anode;
The tips of these auxiliary anodes 4, 4 protrude further toward the discharge space than the filament coil 3, and the base ends are joined to the internal lead wires 2, 2.

Conventionally, in order to join the base ends of these auxiliary anodes 4, 4 to the internal lead wires 2, 2, the auxiliary anodes 4, also having a round cross section, are attached to the internal lead wires 2, 2, which have a round cross section.
4 are brought into contact with each other and welded together, specifically, by welding them using resistance welding electrodes a, a.

[Problem that the invention attempts to solve]

However, when a fluorescent lamp made by welding the auxiliary anodes 4, 4 as described above is lit, some lamps still flicker irregularly, and after investigating the cause, we found that
It was found that there was a misalignment in the mounting posture of the auxiliary anodes 4, 4.

That is, the conventional welding structure described above is a structure in which the auxiliary anodes 4, 4, each having a round cross section, are brought into contact with the internal lead wires 2, 2, which are also round in cross section, so that the two are connected to each other as shown in FIG. When the auxiliary anodes 4, 4 are brought into contact with the internal lead wires 2, 2, the orientation of the auxiliary anodes 4, 4 becomes unstable, resulting in a point contact, and the angle of inclination shown in FIGS. 7 and 8, respectively. α
and [beta] may become excessive, resulting in variations in the mounting posture and the problem that the auxiliary anodes 4, 4 are more likely to be poisoned. Furthermore, during manufacturing, a problem sometimes occurred in which the auxiliary anodes 4, 4, which were installed in a deviated position, damaged the phosphor coating.

Therefore, the present invention provides a joining structure for an auxiliary anode in a fluorescent lamp, which stabilizes the orientation of the auxiliary anode and prevents uneven installation posture when welding the auxiliary anode to the internal lead wire.

[Problem that the invention attempts to solve]

In the present invention, flat surfaces are formed on opposing surfaces of the internal lead wire and the base end of the auxiliary anode, and the internal lead wire and the auxiliary anode are welded by bringing these flat surfaces into contact with each other. It is characterized by

[Example of idea]

The present invention will be explained below based on an embodiment shown in FIGS. 1 to 3.

In addition, in FIGS. 1 to 3, parts that are the same as those in the prior art shown in FIG. 4 are given the same numbers, and their explanations will be omitted.

The internal lead wires 2, 2 are formed with flat surfaces 10, 10 at the locations where the auxiliary anodes 4, 4 are welded, and the ends of the internal lead wires 2, 2 are formed on the auxiliary anodes 4, 4 at the ends thereof. Other flat surfaces 11, 11 are formed opposite to the flat surfaces 10, 10. These flat surfaces 10, 10 and 11, 11 are formed by crushing press processing or cutting, but the internal lead wires 2, 2 and the auxiliary anodes 4, 4 are also formed only on at least one side surface that abuts each other. Good too. In this way, when welding the auxiliary anodes 4, 4 to the internal lead wires 2, 2 using the resistance welding electrodes a, a, the auxiliary anodes 4, 4
1 and 11 are flat surfaces 10 and 1 of internal lead wires 2 and 2
0, the two come into surface contact. Therefore, the contact area increases, the contact posture becomes stable, and the deviation in the orientation of the auxiliary anodes 4 is reduced.

Further, since the contact area between the auxiliary anodes 4, 4 and the internal lead wires 2, 2 increases, the bonding strength also increases, and they will not come off even if vibrations or shocks are transmitted.

Furthermore, since the auxiliary anodes 4, 4 are no longer tilted, the problem of damaging the phosphor coating is also prevented.

In the conventional case shown in Figures 4 to 8, defective products with an inclination angle α of the auxiliary anodes 4, 4 exceeding 10 degrees are approximately
However, according to the structure related to the present invention, only about 0.1% of defective products with a tilt angle α exceeding 10 degrees occur, and defective products with a tilt angle β exceeding 10 degrees In the case of rupture, about 0.7% occurred, but according to the structure related to the present invention, the occurrence remained at about 0.2%, confirming its effectiveness.

Note that the welding method is not limited to resistance welding, but normal welding is also possible.

[Effect of idea]

As explained above, according to the present invention, flat surfaces that are brought into surface contact with each other are formed on the opposing surfaces of the internal lead wire and the base end of the auxiliary anode, and these internal lead wires and the auxiliary anode are brought into contact with the flat surfaces. Since the internal lead wire and the auxiliary anode are welded together, the contact area between the internal lead wire and the auxiliary anode is increased, and the orientation of the auxiliary anode is stabilized, thereby preventing the auxiliary anode from being installed in an irregular position.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a perspective view showing a mount of a fluorescent lamp, FIG. 2 is a perspective view showing a portion where an auxiliary anode is joined to an internal lead wire, Fig. 3 is a cross-sectional view of the same, Fig. 4 and subsequent figures show the conventional structure, Fig. 4 is a perspective view showing the fluorescent lamp mount, and Fig. 5 is a perspective view showing the part where the auxiliary anode is joined to the internal lead wire. 6 are cross-sectional views thereof, and FIGS. 7 and 8 are views for explaining the inclination of the auxiliary anode, respectively. 1...Stem glass, 2...Internal lead wire, 3
...Filament coil, 4...Auxiliary anode, 1
0,11...Flat surface.

Claims (1)

[Scope of utility model registration request] In a fluorescent lamp in which the base end of an auxiliary anode consisting of a wire whose tip protrudes further into the discharge space than the filament coil is welded to the internal lead wire supporting the filament coil, the internal lead wire and the base end of the auxiliary anode are opposed to each other. 1. A joining structure for an auxiliary anode in a fluorescent lamp, characterized in that flat surfaces are formed on the surfaces to make surface contact with each other, and the internal lead wire and the auxiliary anode are welded by bringing these flat surfaces into contact with each other.