JPS59180957A - Halogen bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a halogen light bulb in which an auxiliary support for supporting an internal lead wire is embedded in the crushing seal portion of the bulb.

[Technical background of the invention and its problems]

In this type of halogen light bulb, the filament sealed together with a halogen substance inside the hard glass bulb is connected between internal lead wires sealed in the crushing sealing part of the bulb. Conventionally, molybdenum (Mo), whose expansion coefficient is close to that of hard glass, is often used as the lead wire. In this case, molybdenum is difficult to process as is well known, so when attempting to caulk the internal lead wire and filament, the diameter of the internal lead wire that can withstand the process is limited to between 0.2 and 0.5 μm. I end up.

Therefore, the rigidity of the internal lead wire decreases, so for example, in H4 type halogen light bulbs where the distance from the crushed sealing part of the bulb to the filament is long, that is, the lead-out length of the internal lead wire is long, the vibration resistance will be affected. A problem arises.

Conventionally, as a countermeasure against this problem, an auxiliary support made of tungsten wire is implanted in the crush sealing part of the valve, and the tip of this auxiliary support is fixed to the internal lead wire, so that the internal lead wire is supported at two points. It is known that it improves stamina.

On the other hand, it is well known that a metal such as tantalum is sealed in the bulb of this type of halogen bulb as a getter to remove small amounts of impurities such as air remaining in the upper bulb. This getter metal is usually attached to the internal lead wire or the crush sealing part (in this case, the auxiliary support mentioned above also functions as a getter. In other words, if the auxiliary support is made of tantalum alloy, it can be used as a special getter. There is no need to encapsulate metal, which is extremely favorable in terms of manufacturing.

However, unfortunately, when the auxiliary support itself is given a getter function, the following problems occur. In other words, since the getter has a large effect on the 710 generation cycle, the amount of the getter enclosed needs to be set with high precision.
Not only does the amount of getter included vary, but the amount itself is too large. As a result, the halogen cycle is significantly suppressed, causing problems such as blackening of the tube wall.

[Purpose of the invention]

The present invention was made based on these circumstances, and
To provide a halogen light bulb that eliminates the need for a special getter metal by allowing an auxiliary support to also serve as a getter function, and in addition, there is no possibility that the getter will adversely affect the halogen cycle.

[Summary of the invention]

That is, the present invention aims to achieve the above object.

With a high melting point metal such as molybdenum or tungsten as an auxiliary support to support the internal lead wires.

It is characterized by using an alloy with at least one getter metal selected from tantalum, zirconium, titanium, niobium, vanadium, hafnium, etc.

[Embodiments of the invention]

The present invention will be explained below based on an embodiment shown in the drawings.

In the figure, 1 is a bulb made of hard glass such as alumina silicate, and one end of this bulb 1 is crushed to form a sealing part 2.

After the inside of the valve l is evacuated through the exhaust pipe 3,
A predetermined amount of halogen material is sealed together with an inert gas. Furthermore, internal lead wires 4, 4 made of molybdenum (Mo) are directly sealed within the sealing portion 2, and the internal lead wires 4.4 are connected to the external lead wires 5.5 within the sealing portion 2. has been done. The tip of the internal lead wire 4.4 is led out into the bulb l, and a tungsten filament 6 is caulked to this lead-out end. Since the internal lead wire 4.4 was caulked to the filament 6, the diameter was 0.2 m5tr-0.5w due to processing problems.
In addition, in the halogen light bulb of this embodiment, the length from the filament 6 to the sealing portion 2, in other words, the length L of the internal lead wire 4.4 is 12 m5 μ.

Furthermore, a pair of linear auxiliary supports 7.7 located outside the internal lead wire 4.4 are sealed in the crushing sealing portion 2 in an implanted state. The auxiliary support 7.7 extends substantially parallel to the internal lead wire 4.4 toward the filament 6, and is bent inward before reaching the filament 6, and each of these bent portions 8, 8 It is fixed by welding or caulking at a position spaced a certain distance from the filament 6 on the internal lead wires 4,4. Therefore, the base end of the internal lead wire 4.4 is supported by the sealing part 2, and the part leading out from the sealing part 2 is supported by the auxiliary support 7.7, so that it is supported at two points. ing.

Therefore, the above-mentioned auxiliary support 7.7 is made of a high melting point metal such as molybdenum (Mo) or tungsten (W) as a base metal, tantalum (Ta), zirconium (Zr), titanium (Ti), niobium (Nb), or vanadium. An alloy in which at least one getter metal selected from (V) and hafnium (i-n) is mixed in an appropriate ratio is preferable.
Furthermore, when tantalum (Ta) is used as the getter metal, all three tantalum (Ta)
It is desirable that the alloy be mixed at a ratio of 1 to 10 parts.

According to the halogen light bulb having such a structure, the auxiliary support 7.7 is made of an alloy in which molybdenum (Mo), which is the base metal, and tantalum (Ta), which is the getter metal, is mixed in a predetermined ratio. There is no need to encapsulate a special getter metal in the wafer, which reduces the number of parts and reduces manufacturing man-hours. Moreover, in this case, the amount of getter enclosed can be adjusted arbitrarily and with high precision by changing the mixing ratio of getter metal, so even though the auxiliary support 7.7 also has the getter function, the amount of getter may vary or be too large. There will be no more. In addition, since the auxiliary support 7.7 is spaced apart from the filament 6, the influence of heat from the filament 6 is reduced, and evaporation of getter metals such as tantalum (Ta) is suppressed. In other words, when the getter metal evaporates, it interferes with the halogen cycle of the halogen substance, so if the evaporation of the getter metal can be suppressed, the amount of getter can be adjusted with high precision, and there will be no negative effect on the halogen cycle, and the pipe It can prevent the phenomenon of wall deterioration.

In addition, since the auxiliary support 7.7 need only be fixed to the sealing part 2, when sealing the internal lead wire 4.4, there is no need to take into consideration the fit with the sealing part 2, that is, the coefficient of expansion. Therefore, there is no problem in using tungsten (W) as the base metal of the auxiliary support 797. And this is extremely advantageous for halogen bulbs. That is, even molybdenum (Mo) is not free from the possibility of having an adverse effect on the halogen cycle. Therefore, tungsten (W), which is not attacked by halogen substances, is preferable as the base metal of the auxiliary supports 7, 7.

In addition, when molybdenum (Mo) is used as the base metal of the auxiliary support 7.7, this auxiliary support 7.7
can be led out from the sealing part 2 and used as a support for fixing the valve 1 to the mouthpiece or instrument side, and can effectively contribute to improving the support strength and vibration resistance of the valve 1. .

〔Effect of the invention〕

According to the present invention described in detail above, the auxiliary support is made of at least one getter metal selected from high melting point metals such as molybdenum or tungsten, carbon dioxide, zirconium, titanium, niobium, vanadium, and hafnium. Since it is constructed from an alloy, the auxiliary support can also serve as a getter function, and there is no need to encapsulate a special getter metal in the valve, thereby reducing the number of parts. Moreover, even though the auxiliary support also has the getter function, the amount of getter does not increase or vary unnecessarily, and the heat effect from the filament on the auxiliary support is also small, so the getter metal This has the advantage that evaporation can be suppressed, and as a result, there is no adverse effect on the halogen cycle, and blackening of the tube wall can be prevented.

[Brief explanation of the drawing]

The drawing is a side view showing an embodiment of the present invention. 1... Valve, 2... Sealing part, 4... Internal lead wire, 6... Filament, 7... Auxiliary support.

Claims (2)

[Claims] (1) A filament and a halogen substance supported by an internal lead wire are enclosed in the bulb, and the tip of an auxiliary support is implanted in the crushing sealing portion of the bulb at a position apart from the filament in the internal lead wire. In the fixed halogen light bulb, the auxiliary support is made of an alloy of a high melting point metal and at least one getter metal selected from tantalum, zirconium, titanium, niobium, vanadium, hafnium, etc. and halogen light bulbs. (2) The diameter of the internal lead wire is 0.5w or less. The halogen light bulb according to claim 1, wherein the distance from the crushing sealing part of the bulb to the filament is 12 ma Ifi.