JPS58223237A - Manufacture of discharge lamp - Google Patents

Abstract

PURPOSE:To improve efficiently the planting strength against insulating plates by a method wherein thermocontracting members are used for the insulating plates of a cap while the cap pins are fastened by utilizing thermocontraction due to the heating in the process of attaching the cap. CONSTITUTION:The inside of the opening part of a cap 1 is coated with a fixed amount of cap cement 2. Further, the cap 1 is so constituted that a pair of recessions 5 having each a hole 4 on the respective bases are formed on the bottom 3a of a metal cap shell 3 while the first circular insulating plates 6 are arranged on the bases of the respective recessions 5 and the circular second insulating plates 7 are arranged on the insides corresponding to the recessions 5 and the cap pins 8 are planted on the bottom so that the first and the second insulating plates 6 and 7 may be held between the swelling out parts 9 and the bending pieces 10 thereof. Still more, said first and second insulating plates 6 and 7 are composed of the thermocontracting members such as heat-resisting fiber and the gaps, for instance, of 0-0.2mm. in the radial direction are given between the holes thereof and the outside diameters of the cap pins 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a discharge lamp, and more particularly to improving the strength of the base pin in the base in which the base pin is attached to the insulating plate.

Generally, as shown in FIGS. 1 and 2, a discharge lamp cap is formed by forming a pair of four parts 0 having holes B on the bottom surface at the bottom of a metal fitting A, and forming a pair of four parts 0 on the bottom of a metal fitting A, and A circular first insulating plate E is placed on the inner surface corresponding to the fourth part 0, a rectangular second insulating plate E is placed on the inner surface corresponding to the fourth part 0, an L1 gold bottle F is placed on the bottom part, and a L1 gold bottle F is placed on the bottom part. The second insulating plate E is installed so as to sandwich it therebetween.

By the way, in this 1] gold, the 1st and 2nd insulating plates E are made of paper Bakelite or cloth Bakelite, which have excellent heat resistance and insulation properties, and the hole diameter of the plate is the same as that of the cap pin. It is set to have a sufficient margin for the outer diameter of F.

If there is no tolerance between the two, the 1st and 2nd pins of the cap pin
When inserting it into the insulating plate, a crack occurred around the hole, and the first pin of the cap pin F. This is because the installation strength with respect to the second insulating plate E is significantly impaired.

Therefore, if the cap pin F is heated excessively, especially in the cap attaching process, the first. The installation strength of the second insulating plate, K, is significantly reduced, which not only causes pin breakage and rattling, but also increases problems in the manufacturing process such as poor welding of the cap bottle and lead wire. This problem arises.

In view of these points, the present invention provides a method for manufacturing a discharge lamp that can effectively improve the strength of the base pin in the insulating plate. Refer to and explain.

First, as shown in FIG. 3, a certain amount of cap cement 2 is deposited on the inner surface of the opening of the cap 1. This cap 1 has a pair of four parts 5 having holes 4 on the bottom surface formed on the bottom part 3a of a metal cap shell 3, and a circular first insulating plate 6 on the bottom surface of the four parts 5, which corresponds to the four parts 5. A circular second insulating plate 7 is arranged on the inner surface, and a base pin 8 is disposed on the bottom part, and a bulge part 9 of the base pin 8 is arranged on the bottom part.
．． 1st at the bent piece lO. The second insulating plates 6 and 7 are installed so as to be sandwiched between them. In addition, 1st. The second insulating plates 6 and 7 are made of a heat-shrinkable material such as heat-resistant fiber, and there is a gap of O-0.2 ml in the radial direction between the hole thereof and the outer diameter of the cap pin 8. A gap is provided. Next, as shown in FIG. 4, the base 1 is attached to the end of the lamp body 14, which is made by sealing the stem 13 equipped with the electrode 2 at the end of the bulb 11, and the lead wire 15 is connected to the base pin 8. Attach the lead wire 15 so that it is inserted through the Ll
Arc weld to the tip of the base pin. Next, the base shell 3
The cap 1 is fixed to the end of the lamp body 14 by heating the cap cement 2 to about 200''C through the lamp.

A discharge lamp is manufactured by a conventional method.

In this way, the first. Since the second insulating plates 6 and 7 are made of a heat-shrinkable member, they are thermally shrunk by heating in the cap attaching process and tighten the cap pin 8. For this purpose, the first . It is possible to improve the installation strength of the second insulating plates 6 and 7, and to prevent rattling and bottle rotation. In particular, this tightening has the first effect. Second insulating plates 6, 7
The tolerance in the radial direction between the hole and the outer diameter of the cap pin 8 is 0.
It becomes the largest at ~0.2 dragons.

Moreover, the first. Since the holes of the second insulating plates 6 and 7 can have a sufficient margin with respect to the outer diameter of the base pin 8,
]] It is possible to reliably prevent the occurrence of cracks around the hole when the gold pin 8 is inserted.

Also, 1st. Since the heat shrinkage of the second insulating plate 6.7 is carried out in the heating process in the fitting process, there is no need to provide a special heating process.

Furthermore, the first. Since the second insulating plates 6 and 7 are arranged independently with respect to each base pin 8, the amount used can be reduced compared to conventional products, and the heat-resistant fiber is cheaper than paper Bakelite. Therefore, the cost of the cap can be effectively reduced.

In particular, by making the second insulating plate 7 thinner than the first insulating plate 6, the cost can be further reduced without sacrificing the effect of tightening the cap pin 8.

Next, specific examples will be described. In Figure 3,
9,0 with a hole of 2°52φ centered on the first insulating plate 6
With a circular fiber of φX l,, O-, a hole of 9,0φ
．． 8 is composed of a circular fiber with an outer diameter of 2.
．． 5 to the cap 1 which is held by the cap pin 8 of 37φ.
- Apply gold cement. Next, this cap 1 is attached to the end of the lamp body, and the cap 1 is heated at 200"C for 3 minutes to fix the cap 1 to the lamp body. The discharge lamp is manufactured using the following normal method. .

When we investigated the installation strength of the cap pin against the insulating plate in this discharge lamp by checking whether there was any wobbling around the pin, we found that there was no wobbling around the bottle, and it was confirmed that sufficient installation strength was obtained. Ta.

However, the conventional product shown in Fig. 1 has a reduction of 15% under the same conditions.
There was some wobbling around the pin.

In addition, in the present invention, 1. It is desirable that both of the second insulating plates be made of a heat-shrinkable material, but either one may be made of a material other than a heat-shrinkable material.Also, the heat-shrinkable material may be made of a material other than fibers. You can also use

As described above, according to the present invention, a heat-shrinkable member is used for the insulating plate of the cap, and the cap pin is tightened using heat shrinkage caused by heating in the cap attaching process, so that the strength of the pin against the insulating plate is effectively increased. can be improved.

−6=

[Brief explanation of the drawing]

Figure 1 is a side sectional view of a conventional discharge lamp cap, and Figure 2 is a side sectional view of a conventional discharge lamp base.
3 and 4 are explanatory diagrams of the method of the present invention, FIG. 3 is a side sectional view showing the state in which the cap is coated with cap cement, and FIG. 4 is a lamp of the cap. FIG. 3 is a side sectional view showing a state of attachment to the main body. 7- Figure 1 Figure 2 △

Claims (1)

[Claims] A cap pin is implanted in the bottom of a metal cap shell so as to sandwich insulating plates arranged on the inner and outer surfaces, and at least one of the insulating plates is made of a heat-shrinkable material. a step of attaching the base to the end of the lamp body; and a step of fixing the base to the end of the lamp body by heating gold cement. Method of manufacturing electric lights.