JPH03274657A - Small size incandescent lamp - Google Patents

Abstract

PURPOSE:To lessen the number of parts and make an incandescent lamp small and economical by forming a projected part which is extended toward the inside of a bulb from a press-crushed sealing part and reinforcing the supporting strength of welds. CONSTITUTION:A projected part 10 which is extended toward the inside of a bulb 1 is formed in the press-crushed sealing part 4 formed at the end part of the bulb 1. The projected part 10 is for supporting welds 6 and a pair of the welds 6 supporting a filament 5 penetrate through the projected part 10 and the press-crushed sealing part 4 air-tightly and are led to outside. Also, an electrode mount is inserted into the bulb 1 from an open part in the lower end and the filament 5 is put at the prescribed position in the bulb 1. The electrode mount is prepared by bridging the filament 5 between the upper ends of a pair of the welds 6 previously. As a result, the projected part 10 reinforces the supporting strength of the welds 6 and thus the number of the parts may be lessened. Consequently, the manufacture of the lamp becomes easy and the size can be small.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to small incandescent light bulbs, such as wedge base type.

(Prior Art) For example, small halogen light bulbs used in automobile headlights have a wedge-based structure.

A conventional halogen bulb with no base of this type will be described with reference to FIGS. 7 and 8.

In the figure, 1 is a bulb, which is made of transparent quartz glass or hard glass. One end of the valve 1 is closed, and a tip-off portion 3, which is the result of sealing off the exhaust pipe 2, is formed on this closing wall. Further, the other end of the valve 1 is sealed by a crushing sealing part 4.

A filament 5 is housed in the bulb 1,
Both ends of this filament 5 are connected to wells 6.6. These wells 6.6 are supported by a bridge glass 7 in the middle and are passed through the crushing sealing part 2 in an airtight manner. These wells 6.6 guided to the outside are bent and placed along the outer surface of the crush sealing portion 2 to form power receiving terminals 8,8.

The above-mentioned halogen gas is sealed inside the bulb 1 as described above.

(Problems to be Solved by the Invention) In the halogen light bulb having such a structure, the well 6.6 is supported in the middle of the bulb 1 by a bridge glass 7 to reinforce mechanical strength.

That is, the pair of wells 6.6 pass through the bridge glass 7 and are insulatively connected in the middle by the bridge glass 7.
．． 6 are fixed to each other to improve strength against vibrations and the like.

However, such a structure requires a special bridge glass 7, which increases the number of parts. Further, in such a configuration, the mount must be constructed by heating and melting the bridge glass 7 and passing it through the pair of wells 6.6, and the mount must be sealed in the bulb, which increases the manufacturing process. It has the disadvantage of requiring time and effort to manufacture.

The present invention was made based on these circumstances, and its purpose is to provide a small incandescent light bulb that has a reduced number of parts, requires no effort to manufacture, and can be supplied at low cost. .

[Structure of the Invention (Means for Solving the Problems)] In order to achieve the above object, the present invention forms a protrusion extending from the crushing sealing part into the inside of the valve, and the crushing sealing part and the protrusion have It is characterized by a pair of wells that are hermetically sealed.

(Function) According to the present invention, the protruding part extending from the crushing sealing part into the inside of the bulb performs the same function as a conventional bridge glass, reinforcing the supporting strength of the well, and therefore, the conventional bridge glass becomes unnecessary. The number of parts is reduced, and the protrusion can be formed at the same time as the crushing sealing part, that is, at the time of crushing sealing, so manufacturing is easy.

(Example) The present invention will be described below based on an example shown in FIGS. 1 to 6.

FIG. 1 shows a cross section of the baseless metal halogen light bulb of this embodiment, and members similar to the conventional ones shown in FIGS. 7 and 8 will be described with the same reference numerals.

A collapsible sealing part 2 formed at the end of the bulb 1 is integrally formed with a protrusion 10 extending toward the inside of the bulb.

This protrusion 10 supports the wells 6.6 in place of the conventional bridge glass, and the pair of wells 6.6 that supported the filament 5 airtightly seal the inside of the crush sealing part 2 from the protrusion 10. It penetrates and is led to the outside.

Incidentally, such a protrusion 10 can be formed by a manufacturing method shown in FIGS. 3 to 6, which will be explained below.

The valve 1 shown in Figure 383 has an exhaust pipe 2 connected to its upper end.

The electrode mount is constructed by installing a filament 5 in advance between the upper ends of a pair of wells 6.6, and a jig (not shown) is used to install the filament 5 at a predetermined position within the bulb 1. Retained.

In this state, the side wall at the lower end of the bulb 1 is heated by a burner 11, etc. to soften it.

When the side wall of the valve 1 is heated with the burner 11...
Since the glass tube has the property of shrinking in diameter as it softens, the heated area gradually shrinks.

At this time, when the heating area is expanded vertically by moving the bulb 1 and the burner 11 .

When the self-acting part 12 reaches a predetermined size, the opening is crushed and sealed. This crushing is ji'! The self-playing tool 12 is crushed using a pressing jig 13, 13 as shown in FIG. 5 and a pressing jig (not shown) in a direction perpendicular to the paper surface. In this case, the lower side is held down by a stopper 14 so that the pressed glass meat does not escape downward.

In this way, when the heated and softened seal 12 at the lower end of the valve 1 is pressed with the pressing jig 13, 13 or the stopper 14, it is crushed and sealed (pinch seal), and the jig presses the part, causing the excess As shown in Figure 6, the meat that has become
It escapes toward the inside and bulges inward, thus forming the protrusion 10.

The well 6.6, which has been inserted into the valve 1 in advance, is sealed to the protruding portion 10 and the crushing sealing portion 4.

After this, the inside of the valve 1 is evacuated through the exhaust pipe 2, and halogen gas is filled in, and the exhaust pipe 2 is sealed off.

In such a configuration, since the protruding portion 10 extending integrally from the crushing sealing portion 4 presses the pair of wells 6.6, the support strength of the filament 5 is increased, and even if shock or vibration is applied, Vibration of the filament 5 can be prevented, and the protrusion 10 has a reinforcing effect that is equal to or greater than that of a conventional bridge glass.

In this case, since the protrusion 10 is integrally formed with the crushing sealing part 4, no special parts are required and the configuration is simplified.

Moreover, the protrusion 10 can be formed simultaneously during the pinch sealing process by the manufacturing method shown in FIGS. 3 to 6, so no special process is required.

Therefore, compared to the case of using the conventional bridge glass 7, the number of manufacturing steps is reduced, and the manufacturing effort and manufacturing time can be reduced, so that it can be manufactured at low cost.

Note that it is desirable that the height and size of the protrusion 10 be set within the following ranges.

That is, the angle θ shown in FIG. 2 is an angle formed by a line connecting the filament 5 and the position where the straight portion of the bulb wall ends. Normally, among the light emitted from the filament 5,
Since the crushed sealing part 4 is present here, the transmitted light is disturbed in the light traveling in the direction of the crushed sealing part 4, and therefore, the light in this direction has low reliability and is not effectively used for irradiation. In other words, if the angle θ is within the above range, there will be little adverse effect on the light emitted to the outside. Therefore, the protrusion 1
0 is preferably set within the range of the above angle θ.

Note that the present invention is not limited to the above embodiments.

That is, in the above embodiment, the case of a baseless metal halogen light bulb has been described, but the present invention is not limited to a halogen light bulb, and may be a normal incandescent light bulb.

[Effects of the Invention] As explained above, according to the present invention, since a protrusion extending from the crushing sealing part to the inside of the bulb is formed, this protrusion serves the same function as a conventional bridge glass and increases the supporting strength of the well. , thus eliminating the need for conventional bridge glass and reducing the number of parts. Further, since the protruding portion can be formed at the same time as the crushing sealing portion is molded, that is, at the time of crushing sealing, manufacturing is easy.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figures 1 to 6 show an embodiment of the present invention, in which Figure 1 is a perspective view of a mouthless metal halogen light bulb, Figure 2 is a cross-sectional view thereof, and Figures 3 to 6 show an embodiment of the present invention. Figure 6 is an explanatory diagram showing the manufacturing procedure, Figure 7
Figures 8 and 8 show a conventional halogen bulb with no base,
FIG. 7 is a perspective view, and FIG. 8 is a sectional view thereof. DESCRIPTION OF SYMBOLS 1... Valve, 4... Crushing sealing part, 5... Filament, 6... Well, 10... Protrusion part.

Claims (1)

[Claims] A small incandescent light bulb in which the ends of the bulb are crushed and sealed, a pair of wells are hermetically sealed through the crushed seal, and a filament is stretched between the ends of these wells inside the bulb. A small incandescent light bulb, characterized in that a protruding part extending into the bulb from the crushing sealing part is integrally formed, and the pair of wells are hermetically penetrated and sealed over the crushing sealing part and the protruding part. .