JPH0554217B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a light bulb that is made of a glass tube that houses a filament and is crimped and sealed at one end and that has a cap attached to it.

Conventional configurations and their problems Conventionally, for example, single-end halogen light bulbs,
In an incandescent light bulb that has a structure in which one end of the glass tube is crimped and sealed, a filament is housed inside, and a cap is glued to the crimp-sealed part of the glass tube, the method of adhering the cap to the end of the glass tube is as shown in Figure 1a and As shown in b, the crimp-sealed part 3 of the glass tube 2 containing the filament 1 is inserted into the rectangular hole provided in the ceramic cap 4, and the lower end of the crimp-sealed part 3 is inserted into the cap 4. The configuration was such that an adhesive 6 was filled between the crimp sealing part 3 and the cap 4 to fix them together while supporting the base 5 at the bottom 5 of the rectangular hole.

Generally, when bonding the base of light bulbs, it is important to minimize the deviation of the glass tube axis with respect to the base axis, since the light bulb is used by being attached to a lighting equipment. In the structure as well, the adhesive 6 is dried and baked while correcting this point using an automatic machine or jig, but the lower end of the crimp sealing part 3 is supported by the base hole bottom 5. Therefore, glass tube 2 is damaged due to friction and snag between both tubes.
There was a problem that the axis alignment work of the cap 4 could not be carried out smoothly in some cases.

OBJECTS OF THE INVENTION The present invention was made to solve these problems, and it is an object of the present invention to provide a light bulb having a structure that allows easy alignment of the glass tube and the cap during the cap bonding process.

Structure of the Invention In order to achieve the above object, the light bulb of the present invention is provided with linear protrusions approximately in the center of both surfaces of the crimp-sealed portion of the glass tube, and with corresponding linear protrusions in the cap hole. A small protrusion is also provided on the side surface so that the crimp-sealing part is supported within the mouthpiece hole without its lower end coming into contact with the bottom of the mouthpiece hole.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIGS. 2a to 2c, 3 is a crimp-sealed part of the glass tube 2, and linear protrusions 7 and 8 are provided on both sides of the crimp-sealed part of the glass tube 2.
is provided. These linear protrusions 7 and 8 serve to increase the mechanical strength of the portion of the crimp sealing part 3 exposed from the base 4, and
Its lower end is supported by small protrusions 9 and 10 provided on the side surface inside the hole of the cap 4, and the crimp sealing part 3
The lower end of the hole is made to float above the hole bottom 5 of the base 4. 6 is an adhesive.

Linear protrusions 7 and 8 on the surface of the crimp sealing part 3
are formed by a crimp block in the process of heating the glass tube 2 with a burner and crimp-sealing it, so the lower ends of the linear protrusions 7 and 8 can be formed at the same height with high accuracy, so that the crimp-sealing is completed. When the stopper is inserted into the hole of the cap 4, the inclination of the glass tube 2 in a plane perpendicular to the crimp sealing surface is eliminated, and the axis alignment of the glass tube 2 and the cap 4 is mainly done in the plane that includes the crimp sealing surface. It only needs to be done inside the hole of the cap 4, and the crimp sealing part 2 only needs to be
Since it is only supported at points, alignment work can be done extremely smoothly.

Effects of the Invention As explained above, the present invention provides a light bulb that has an excellent effect in that the axis alignment of the glass tube and the cap can be performed extremely smoothly and accurately when adhering the cap to the crimp-sealed portion of the glass tube. It is something that can be done.

[Brief explanation of the drawing]

Figure 1a is a front view of a conventional single-cap type light bulb;
Figure b is a side view, Figure 2a is a front view showing the main parts of the light bulb of the present invention, Figure 2b is a side view of the main parts,
FIG. 2c is a cross-sectional view taken along the line--in the same figure. 1... filament, 2... glass tube, 3...
Sealing portion, 4...cap, 5...bottom, 6...adhesive, 7, 8...protrusion, 9, 10...small protrusion.

Claims (1)

[Claims] 1. The crimp is applied to the center of both sides of the crimp-sealed portion of the glass tube having a filament therein, from the boundary end of the crimp-sealed portion with the tubular portion of the glass tube in the direction of the other end of the crimp-sealed portion. A linear protrusion having a length shorter than the length of the sealing part is formed, and minute protrusions are also formed on both sides of the mouthpiece hole into which the crimp sealing part is inserted at positions corresponding to the ends of the protrusions of the crimp part. established,
A light bulb characterized in that the crimp-sealed portion of the glass tube is supported at two points within the cap hole by these two protrusions, and the crimp-sealed portion of the glass tube and the cap are bonded with an adhesive.