JPS60175338A - Connection of filament electrode - Google Patents

Abstract

PURPOSE:To simplify connection of a filament by a method, in which one line is bent in a U-shape and its both leg parts are sealed to the stem while the filament end parts are welded to the horizontal part followed by cutting off the center of the horizontal part. CONSTITUTION:When mounting a coiled filament electrode 6 on a small-sized phosphor lamp or the like for substitution of an incandescent lamp, firstly one line is bent in a U-shape for forming a sealed-in line 20 while vertically sealing its both leg parts 21 on a stem 2. Next, the filament 6, in which its line connection part 12 is bent orthogonally to the axial direction of the coiled part 11, is fixed by spot welding to both ends of the horizontal part 22 of the sealed-in line 20. Thereafter, connection of the filament 6 is completed by cutting-off the horizontal part 22 near its center. Accordingly, inspite of any possible variety of the filament connecting part 12 or of any possible positional gap from the sealed-in line 20, the line connection is correctly performed without any defective.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for connecting filament electrodes used in discharge tubes having a small diameter, such as discharge tubes for small fluorescent lamps used as substitutes for incandescent lamps.

(Background Art) Fig. 1 is a perspective view showing an example of a small fluorescent lamp whose main purpose is to save power.
Two U-shaped inner tubes 4 are housed in the discharge space 3 kept airtight by the discharge space 3, and the inner surface of the U-shaped inner tube 4 is coated with a phosphor 5. Further, one end of the U-shaped inner tube 4 is hermetically fixed around the electrode 6 by glass welding, and the other open end 7 is used to generate a discharge between the two electrodes 6.6. In addition, in the figure, 8 is a lighting device part, 9 is a screw cap, and the stem 2 is 2 as shown in FIG.
A filament 6 is connected to each of the enclosed wires 10 of the set, and a cross-sectional view of the welded portion between the stem 2 and the inner tube 4 is shown in FIG.

Now, it is known that as a means of making the lamp more compact and highly efficient, it is effective to make the diameter of the discharge tube (inner tube 4 in the conventional example above) smaller and increase the discharge potential gradient. ing. However, in order to reduce the discharge tube diameter, the filament connection interval (distance d in Figure 3) is required.
On the other hand, the length of the filament cannot be easily shortened in order to maintain good lamp characteristics and lamp life as a characteristic of the filament itself.

Therefore, the present inventor previously proposed the structure of the structure shown in Fig. 4 and Fig.
No. 97). This involves bending the connecting wire portion 12 of the filament 6 approximately at right angles to the axial direction of the coil portion 11, and
2 is connected to the encapsulating wire 10, which is more advantageous than the conventional method for thin tubes as shown by broken lines in FIG. Furthermore, it does not affect the basic design of the filament, nor does it have any adverse effects on lamp characteristics, lamp life, etc.

However, the filament electrode having such a structure also has the following problems when connecting wires.

■The force between the filament joint work 2 and the encapsulated wire 10 (they are parallel to each other, and if there is even a slight misalignment in positioning when joining, the joint performed by spot welding etc. will be incomplete and may cause defects. It had become.

■Since the mutual positional relationship of the two encapsulating lines for one filament, that is, the encapsulating line interval, encapsulating angle, encapsulating line length, etc., vary, positioning during wire connection becomes even more difficult.

(Object of the Invention) The present invention has been made to improve the above-mentioned problems, and its purpose is to reliably and efficiently connect filament electrodes used for thin tubes. Provides a method for connecting wires.

(Disclosure of the Invention) The present invention will be described below with reference to an embodiment shown in FIG. First, the enclosing line 20, which is one line bent into a U-shape, is arranged so that its legs 21, 21 are substantially perpendicular to the stem 2 (see FIG. 1a). Next, the connecting wire portion 12 as described above is bent at a substantially right angle to the axial direction of the coil portion 11, and the filament 6 is made such that each tip of the wire wire portions 12. They are arranged so as to be located approximately at both ends and fixed by means such as spot welding (see the same figure (bl)).In this case, taking into consideration the positional shift of the filament 6, for example, as shown in FIG. 7, Welding point 2
If you use more than one number 3, welding will be more reliable.

After the filament 6 is attached to the encapsulating wire 20 in this manner, a part of the horizontal portion 22 of the encapsulating wire 20 near the center is cut off to complete the wire connection (see FIG. 2(b)).

By using such a wire connection method, the filament 6
Since the part of the encapsulating line 20 that intersects perpendicularly with the connecting line part 12 is sufficiently long, even if there is a variation in length between the filament connecting parts 12 and 12 or a mutual positional shift with the encapsulating line 20,
Can be connected reliably. In addition, when attaching the encapsulated i20 to the stem 2, one filament requires only one filament, whereas conventionally two filaments are required, which streamlines the process. The accuracy of positional relationships can be improved. In other words, in the past, two wires were individually enclosed in each set, so it was difficult to avoid variations in the distance between the enclosed wires, angles, etc., which made connecting the wires even more difficult. The mutual positional relationship of one set of encapsulating lines is fixed, and variations can be suppressed to a small level.

Next, FIG. 8 shows a different embodiment of the present invention, in which the filament 6 is first attached to the enclosing wire 20 (see FIG. 8(a)), and in this state it is enclosed in the stem 2. According to this method, the wire connecting process is not performed on the stem 2, but is independent, so that it is possible to efficiently connect a large amount of wires.

FIG. 9 shows still another embodiment of the present invention, which relates to the treatment of the encapsulation line after the wire connection shown in FIG. 6fD) and FIG. After cutting the parts (see Fig. 9(a)), bend the rain horizontal parts 22.22 as shown in Fig. 9(b), and sandwich the respective filament connecting parts 12.12 (Fig. 9(a)). (See C1). According to this method, the filament connection becomes stronger.

(Effects of the Invention) As described above, the method for connecting filament electrodes according to the present invention is to bend an encapsulated wire into a U-shape, which is made up of a horizontal portion and both legs. The filament is enclosed in the stem so that it is approximately perpendicular to the stem, and both sleeve wire portions are bent approximately at right angles to the axial direction of the coil portion, so that each end of the sleeve wire portions is aligned with the above-mentioned encapsulated wire. It is characterized in that it is fixed so as to be located at approximately both ends of the horizontal part, and then a part of the enclosing wire near the center of the horizontal part is cut out, making the wire connection work easy and reliable, and improving production efficiency. This has the effect of improving performance and reducing wire connection defects.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a conventional small fluorescent lamp, Fig. 2 is a perspective view showing the electrode portion of the above, Fig. 3 is a cross-sectional view showing the welded part of the stem and inner tube of the above, Fig. 4 is a perspective view showing the electrode part of a different conventional example, Fig. 5 is a sectional view showing the welded part between the stem and the inner tube, and Fig. 6 (al to (C)
1 is a process diagram according to an embodiment of the present invention, FIG. 7 is a simplified diagram showing an example of a connecting means according to the present invention, and FIG.
l is a process diagram according to a different embodiment of the present invention, FIG. 9 (al
-(C) are process diagrams according to further different embodiments of the present invention. Patent applicant Matsushita Electric Works Co., Ltd. Agent Patent attorney Toshimaru Takemoto (and 2 others) Figure 1 Figure 4 Figure 5 Figure 6 Figure 2 Figure 8 Figure 9

Claims (3)

[Claims] (1) An encapsulated line consisting of a horizontal part and both legs, which is a single line bent into a U-shape, is enclosed in the stem so that both legs are approximately perpendicular to the stem, and both lines are The wire portion is bent approximately at right angles to the axial direction of the coil portion, and the filament is fixed so that the ends of both wire portions are located approximately at both ends of the horizontal portion of the encapsulating wire, and then the encapsulating wire is A method of connecting filament electrodes characterized by cutting out a part near the center of the horizontal part. (2) The method for connecting a filament electrode according to claim 1, wherein the filament is fixed to the encapsulated wire, and then the encapsulated wire is encapsulated in the stem. (3) The filament electrode according to claim 1 or 2, wherein after cutting near the center of the horizontal part of the encapsulating line, both filament joint parts are sandwiched at the horizontal part. Connection method.