JPH07302579A - Halogen lamp - Google Patents

Abstract

PURPOSE:To reduce the number of components and working man-hour, and prevent welding failure of a wolfram filament and molybdenum electrode rods to molybdenum foils. CONSTITUTION:Both ends of a wolfram filament 12 are electrically connected to a pair of molybdenum foils 13, 13 and a pair of molybdenum electrode rods 14, 14 are electrically connected to the molybdenum foils 13, 13. An inert gas and halogen or a halogen compound are sealed in a glass housing 17 for housing the glass filament 12, and the molybdenum foils 13, 13 are embedded in a foil fixing part 18 integrally formed with the glass housing 17 with glass so that the tips of the electrode rods 14, 14 are extruded to the outside. A platinum thin film is formed on the surface of the molybdenum foil 13, and by melting the platinum thin film, the filament 12 and the electrode rod 14 are electrically connected to the molybdenum foil 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a halogen lamp in which a tungsten filament is electrically connected to an electrode rod through a molybdenum foil.

[0002]

2. Description of the Related Art Conventionally, in this type of halogen lamp, as shown in FIGS. 4 and 5, both ends of a tungsten filament 2 are paired with a pair of molybdenum pieces 5, 5 having a platinum thin film 6 formed on both sides thereof. It is known that the foils 3 and 3 are electrically connected to each other, and the molybdenum foils 3 and 3 are electrically connected to the pair of molybdenum electrode rods 4 and 4, respectively. In this halogen lamp 1, a glass enclosure 7 containing a filament 2 is filled with halogen or a halogen compound together with an inert gas, and a pair of electrode rods are provided in a foil fixing portion 8 integrally formed with the glass enclosure 7 and made of glass. The molybdenum foils 3, 3 are embedded with the tips of the 4, 4 protruding outward.

In order to electrically connect the filament 2 to the molybdenum foil 3 via the molybdenum small piece 5, first, the molybdenum small piece 5 is placed on the molybdenum foil 3 and spot-welded. At this time, the platinum thin film 6 of the molybdenum small piece 5 contacting the molybdenum foil 3 is melted, so that the molybdenum small piece 5 is electrically connected to the molybdenum foil 3 via the platinum thin film 6. Next, the filament 2 is placed on the upper surface of the molybdenum piece 5 and spot-welded. At this time, since the platinum thin film 6 of the molybdenum small piece 5 which contacts the filament 2 is melted, the filament 2 is electrically connected to the molybdenum small piece 5 via the platinum thin film 6. To electrically connect the electrode rod 4 to the molybdenum foil 3, one end of the electrode rod 4 is placed on the molybdenum foil 3 and spot welding is performed.

[0004]

However, in the above-mentioned conventional halogen lamp, when a molybdenum small piece is placed on a molybdenum foil and spot welding is performed, this welding position is located on the left side from the center of the molybdenum small piece 5 as shown in FIG. If it shifts,
Since the platinum thin film 6 does not melt in the portion of the molybdenum piece 5 away from the spot electrode 9 for spot welding, that is, in the right side portion of the molybdenum piece 5, the molybdenum piece 5 is slightly separated from the molybdenum foil 3 and electrically connected in this portion. Not done. In this state, as shown in FIG. 7, when the filament 2 is placed on the upper surface of the right side portion of the molybdenum small piece 5 and spot welding is performed, the platinum thin films 6 and 6 on both surfaces of the molybdenum small piece 5 must be melted, and spot welding Due to lack of electric power for welding, welding defects frequently occurred. Further, in the above-mentioned conventional halogen lamp, since the melting point of molybdenum is relatively high, even if the molybdenum electrode rod is spot-welded to the molybdenum foil, the two may not be completely welded and a welding failure may occur.

An object of the present invention is to provide a halogen lamp capable of reducing the number of parts and the number of working steps and preventing defective welding of a tungsten filament and a molybdenum electrode rod to a molybdenum foil.

[0006]

A configuration of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiments. The present invention relates to a tungsten filament 1
2 has a pair of molybdenum foils 13 and 13 electrically connected to both ends, and a pair of molybdenum electrode bars 14 and 14 electrically connected to the pair of molybdenum foils 13 and 13.
And a glass envelope 17 containing the filament 12 and containing halogen or a halogen compound together with an inert gas, and a pair of electrode rods 14 and 14 formed integrally with the glass envelope 17, and the tips of the electrodes to the outside. Foil fixing part 1 in which molybdenum foils 13 and 13 are embedded in a protruding state
8 is an improvement of the halogen lamp with. The characteristic configuration is that the platinum thin film 16 is formed on the surface of the molybdenum foil 13, and the filament 12 and the electrode rod 14 are the platinum thin film 1.
It is located where it is electrically connected to the molybdenum foil 13 by melting 6

[0007]

The molybdenum foil 13 and the tungsten filament 12 are electrically connected via the platinum thin film 16 melted by spot welding, and the molybdenum foil 13 and the molybdenum electrode rod 14 are electrically connected via the platinum thin film 16 melted by spot welding. Since it is connected to, welding failure can be prevented.

[0008]

An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, a halogen lamp 11 has a tungsten filament 12 having a coil portion 12a in the center and a very high melting point, and a filament 1
2 includes a pair of molybdenum foils 13 and 13 having both lower melting points than tungsten electrically connected to each other, and a pair of molybdenum electrode bars 14 and 14 electrically connected to the pair of molybdenum foils 13 and 13. . The melting point of tungsten is about 3380 ° C., and the melting point of molybdenum is 262.
It is 5 ° C.

The characteristic construction of this embodiment is that a platinum thin film 16 having a melting point lower than that of molybdenum is formed on the surface of the molybdenum foil 14 by a clad method, and the filament 12 and the electrode rod 14 melt the platinum thin film 16 to melt the molybdenum foil. It is electrically connected to 13 (FIGS. 2 and 3). The melting point of the platinum thin film 16 is 1769 ° C., and the platinum thin film 16 is formed on the entire surface of one surface of the molybdenum foil 13. Although not shown, the filament 12 and the electrode rod 14 are electrically connected to the molybdenum foil 13 by spot welding.

Further, as shown in detail in FIG. 1, the filament 12 is housed in a hollow portion 17a in the glass enclosure 17, and a halogen or a halogen compound is enclosed in the hollow portion 17a together with an inert gas (not shown). At the lower end of the glass enclosure 17, a foil fixing portion 18 integrally formed with the enclosure 17 is provided by glass, and the filament fixing portion 18 is electrically connected to the filament 12 and the electrode rods 14, 14. Molybdenum foil 13, 13 is an electrode rod 14,
It is embedded with the tip of 14 protruding to the outside.

The glass enclosure 17 and the foil fixing portion 18 were melted in a mold (not shown) with the filament 12 electrically connected to the electrode rod 14 through the molybdenum foil 13 being inserted into the mold. It is integrally formed by pouring quartz glass or hard glass. At this time, the upper end of the glass enclosure 17 is open, and the air in the glass enclosure 17 is discharged from this open end (not shown). Instead, halogen or halogen together with an inert gas is introduced into the enclosure 17. After introducing the compound, the open end is sealed by melting. In addition, since a gap (not shown) is generated at the portion where the electrode rod 14 projects from the foil fixing portion 18,
The gap is closed by pouring a bead (not shown) of soft glass. The halogen lamp 11 can be manufactured with a small capacity and a large capacity, with the tungsten filament 12 being less consumed by the halogen regeneration cycle.

The halogen lamp 11 configured as described above
Then, by spot welding both ends of the tungsten filament 12 to the pair of molybdenum foils 13, 13, respectively,
The platinum thin film 16 having a relatively low melting point formed on the surface of the molybdenum foil 13 is melted, and the molybdenum foil 13 and the filament 12 are electrically connected via the platinum thin film 16. When the pair of molybdenum foils 13, 13 are spot-welded to the pair of molybdenum electrode rods 14, 14, respectively, the platinum thin film 16 on the surface of the molybdenum foil 13 is melted and the molybdenum foil 13 and the electrode rods 14 are platinum thin film in the same manner as above. It is electrically connected via 16. As a result, defective welding can be prevented, so that the electrical connection between the filament 12 and the electrode rod 14 does not become unstable. Also, a pair of electrode rods 14,
When a current is passed between 14, the filament 12 heats up, but since the temperature of the joint between the filament 12 and the molybdenum foil 13 is lower than the melting point of platinum, the platinum thin film 16 does not melt due to the heat generation of the filament 12.

In the above embodiment, the platinum thin film is formed on the entire surface of one side of the molybdenum foil by the clad method.
This is an example, the platinum thin film only on a portion of one surface of the molybdenum foil where the tungsten filament and the molybdenum electrode rod are spot-welded, a partial clad method or another thin film forming method, for example, a vapor deposition method, a sputtering method,
It may be formed by a plating method or the like. In the above embodiment, the platinum thin film 16 is formed on the entire surface of the molybdenum foil 13 by the clad method, and the tungsten filament 12 and the molybdenum electrode rod 14 are melted on the one surface of the molybdenum foil 13 to melt the molybdenum foil 13. However, the platinum thin film is formed on both sides of the molybdenum foil by the cladding method or the like, and the tungsten filament is formed on one side of the molybdenum foil and the molybdenum electrode bar is formed on the other side of the platinum. It may be electrically connected to the molybdenum foil by melting the thin film.

[0014]

As described above, according to the present invention, the platinum thin film is formed on the surface of the molybdenum foil, and the platinum thin film is melted to electrically connect the tungsten filament and the molybdenum electrode rod to the molybdenum foil. With this configuration, the molybdenum foil and the filament are electrically connected via the platinum thin film melted by spot welding, and the molybdenum foil and the electrode rod are electrically connected via the platinum thin film melted by spot welding. As a result, defective welding can be prevented, so that the electrical connection between the filament and the electrode rod does not become unstable. Further, in comparison with the conventional halogen lamp that requires a molybdenum piece having a platinum thin film formed on both sides, the present invention does not require the molybdenum piece, so that the number of parts can be reduced and the number of processing steps can be reduced. .

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a halogen lamp according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view corresponding to FIG. 1 showing a conventional example.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is a cross-sectional view corresponding to FIG. 5, showing a state in which a small piece of molybdenum having platinum thin films formed on both sides thereof is spot-welded to a molybdenum foil.

FIG. 7 is a sectional view corresponding to FIG. 5, showing a state in which a tungsten filament is further spot-welded to a molybdenum piece with a platinum thin film spot-welded to a molybdenum foil.

[Explanation of Codes] 11 Halogen Lamp 12 Tungsten Filament 13 Molybdenum Foil 14 Molybdenum Electrode Rod 16 Platinum Thin Film 17 Glass Enclosure 18 Foil Fixing Part

Claims (1)

[Claims] 1. A pair of molybdenum foils (13, 1) in which both ends of a tungsten filament (12) are electrically connected to each other.
3), a pair of molybdenum foils (13, 13) and a pair of molybdenum electrode rods (14, 14) electrically connected to the pair, and the filament (12) and contains a halogen or halogen compound together with an inert gas. A glass envelope (17) in which is encapsulated, and the molybdenum foil in a state where the tips of the pair of electrode rods (14, 14) formed integrally with the glass envelope (17) are projected to the outside. Foil fixing part (18) in which (13,13) is embedded
In the halogen lamp including, a platinum thin film (16) is formed on the surface of the molybdenum foil (13), and the filament (12) and the electrode rod (14) melt the platinum thin film (16). A halogen lamp which is electrically connected to the molybdenum foil (13).