JP2713433B2 - Method of manufacturing one end sealed halogen bulb - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a one-end sealed halogen lamp in which a mixed gas of a halogenated carbide and an inert gas is sealed in a tubular bulb.

2. Description of the Related Art In a conventional one-end sealed mini-halogen bulb for general lighting,
In order to obtain small size and high efficiency, the outer diameter of the tubular valve is reduced, and an infrared reflecting film is formed on the inner or outer surface of the tubular valve. The double coil filament having a large, long segment portion is arranged at the center of the tube axis.

For this reason, the double coil filament has a stem mount structure that is accurately connected between the long and short internal introduction wires and is fixed with one or more anchor wires in order to prevent deformation during lighting. In order to achieve a long life, a mixture gas of a halogenated hydrocarbon and an inert gas is sealed under high pressure in the hermetically sealed valve so as to suppress the evaporation of tungsten at the time of high temperature lighting from the double coil filament. ing.

In this type of one-end sealed mini-halogen lamp, 2
After connecting the external lead wire to each of the other ends of the internal lead wire of the coil mount to which the heavy coil filament is connected via a metal foil made of molybdenum, inserting this into the bulb, and hermetically sealing with the metal foil portion, Exhaust, then, immerse the valve in liquid nitrogen, and fix or liquefy a predetermined amount of mixed gas in the valve to perform high-pressure sealing at atmospheric pressure or higher, and perform each step of sealing the exhaust pipe. Manufactured sequentially
Thereafter, a lighting process such as flashing is performed to stabilize the characteristics. In this step, the recrystallization of the tungsten double coil filament proceeds, and the halogenated hydrocarbon is decomposed.

However, if the lighting process is performed immediately after the sealing of the exhaust pipe as described above, the entire valve is immersed in liquid nitrogen in order to seal the mixed gas at a high pressure.
Halogenated hydrocarbons with a high boiling point and melting point are first liquefied and solidified into metal parts such as a double coil filament having the highest thermal conductivity through the internal introduction line, and then an inert gas with a low boiling point and melting point is liquefied or solidified. I do. After the valve is taken out of liquid nitrogen, on the contrary, first, the inert gas is vaporized, and then the halogenated hydrocarbon is vaporized.However, since it is vaporized under high pressure, it is not sufficiently vaporized yet. As the temperature of the double coil filament rises, the halogenated hydrocarbons directly decompose and combine with tungsten to form tungsten carbide at both end portions of the double coil filament, especially at the portion on the short internal introduction line side. , Very brittle, and the impact resistance is greatly reduced.

Further, when the amount of the tungsten carbide generated is large, there is a problem that the melting point of this portion is lowered, and the portion is melted at the time of flushing. This was more remarkable as the wire diameter of the tungsten double coil filament was smaller.

In order to prevent this, a method has been proposed in which after the exhaust pipe is chipped off, the valve is left until the halogenated hydrocarbon is sufficiently vaporized, or a method in which the halogenated hydrocarbon is decomposed by high-frequency discharge (Japanese Patent Application Laid-Open (JP-A) No. 2002-110630). No. 61-2256).

Problems to be Solved by the Invention However, in the former method, the situation of vaporization is not constant due to the type of halogenated hydrocarbon and the difference in high-pressure filling pressure, and it is very difficult to determine the conditions. There was a problem that the process could not be assembled.

In the case of the latter method, although the production process is consistent, the double-coil filament is arranged with high accuracy at the center of the tubular valve pipe. Since it is surrounded by anchor wires, high-frequency discharge is unlikely to occur in the double coil filament, which is essential, and it is very difficult to exhibit its effect.

Means for Solving the Problems A method for producing a one-end sealed halogen lamp according to the present invention comprises the steps of: providing a long and short internal introduction line in a tubular bulb having an exhaust pipe at one end; A double coil filament connected to extend along the tube axis of the tube valve;
A stem mount including an anchor wire for locking the double coil filament is provided, and an external lead wire is connected to each of the other ends of the two long and short internal introduction wires via a molybdenum metal foil, respectively. After sealing the valve with the metal foil portion, the inside of the valve is evacuated through the exhaust pipe, the valve is immersed in liquid nitrogen, and a halogenated hydrocarbon and an inert gas When the mixed gas is sealed and the exhaust pipe is chipped off to produce a halogen bulb, after the exhaust pipe is chipped off, prior to a lighting step including flashing, the entire bulb is heated to a temperature higher than the critical temperature of the halogenated hydrocarbon. By heating to 350 ° C. or less, the halogenated hydrocarbon attached on the double coil filament is vaporized.

According to such a configuration, flushing can be performed in a state where the halogenated carbide is not fixed on the surface of the double coil filament at all, and tungsten carbide is formed at both end portions of the double coil filament, particularly at a portion on the short internal introduction line side. Is eliminated, and a reduction in impact resistance can be prevented, and the occurrence of fusing can also be prevented. In addition, this heating step is performed by attaching a ceramic base to the valve using an external lead wire and fixing and firing the ceramic part and the valve sealing part with an adhesive, that is, flushing after the completion of the baking step. By providing the lighting process, the consistency of the process is not impaired at all.

Here, the upper limit of the heating temperature is set to 350 ° C. in order to prevent the occurrence of leakage of the sealing portion due to oxidation of the molybdenum metal foil used for hermetic sealing of the tubular valve.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a process after hermetically sealing a one-end sealed halogen lamp for general lighting which is an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a one-end sealed halogen lamp for general lighting similarly. is there.

In FIG. 2, a double coil filament 8 is interposed between the internal introduction lines of a stem in which a short internal introduction line 5, a long internal introduction line 6 and an anchor line 9 are fixed by a stem glass 10.
Are connected to ends of two long and short internal introduction wires via a molybdenum metal foil 3 and a molybdenum external lead wire 4 are provided in the tubular valve 1. The metal foil 3 is hermetically sealed to form a sealing portion 2.
After exhausting the inside of the valve 1, the valve 1 is immersed in liquid nitrogen, and a mixed gas of krypton and nitrogen containing 0.1% of a halogenated hydrocarbon (CHCl ₃ ) equivalent to 3 atm at room temperature is cooled and sucked. Then, the exhaust pipe 15 is chipped off, and a chip-off section 7 is provided. Next, the auxiliary lead wires 13 and 14 are connected to the two external lead wires 4, and the auxiliary lead wires 13 and 14 are welded to the base base 11. Further, the base portion 11 is adhered by bonding the sealing portion 2 and the base portion 11 with an adhesive 12. Next, the adhesive is baked by passing the halogen lamp in a baking furnace set at a temperature of 263.4 ° C. or higher, for example, 280 ° C., which is the critical temperature of the halogenated hydrocarbon (CHCl ₃ ), for about 10 minutes. Thereafter, a voltage of 140% of the rated voltage was applied thereto to perform flashing lighting to obtain a halogen bulb (product of the present invention).

Separately, a halogen lamp (comparative product) obtained by setting the temperature of the baking furnace to 260 ° C. and otherwise under the same conditions as above, and a halogen lamp obtained by performing flushing immediately after sealing the exhaust pipe ( Conventional products).

When a package drop test was performed on the above three (100 pieces each), the results shown in the following table were obtained.

The temperature of the baking furnace is desirably equal to or higher than the critical temperature of the halogenated hydrocarbon. Although a higher temperature is better, a molybdenum metal foil 3 is used for the sealing portion 2, and it is necessary to set the temperature to 350 ° C. or lower in order to prevent the occurrence of leakage due to oxidation of the metal foil.

In this embodiment, the example in which the adhesive baking furnace is used for heating is described. However, even if a device for heating the entire tubular valve after the exhaust pipe is turned off is provided, the same effect can be obtained without impairing the efficiency. Is obtained.

Effect of the Invention As described above, the method of the present invention encloses a mixed gas of a halogenated hydrocarbon and an inert gas in a tubular valve, and after a tip-off of an exhaust pipe, before a lighting step including flashing, By heating the entire valve above the critical temperature of the halogenated hydrocarbon to 350 ° C or less, the halogenated hydrocarbon adhering to the double coil filament is vaporized, preventing the formation of tungsten carbide on the double coil filament. Thus, a halogen bulb having good impact resistance can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a process diagram of a method for manufacturing a one-end sealed halogen lamp according to one embodiment of the present invention, and FIG. 2 is a sectional view of a one-end sealed halogen lamp obtained by the method of the present invention. 1 ... tubular valve, 2 ... sealed part, 3 ... metal foil, 4 ...
... external lead wire, 5 ... short internal lead-in, 6 ... long internal lead-in, 7 ... tip-off part, 8 ... double coil filament, 9 ... anchor, 10 ... stem glass , 11 ... Base base, 12 ... Adhesive, 13,14 ... Auxiliary lead wire.

Claims (1)

(57) [Claims] In a tubular valve having an exhaust pipe at one end, two long and short internal introduction lines are connected between the two internal introduction lines so as to extend along the pipe axis of the tubular valve. A stem mount having a double coil filament and an anchor wire for locking the double coil filament is provided, and the other ends of the two long and short internal introduction wires are respectively connected via a molybdenum metal foil. After connecting an external lead wire and sealing the valve with the metal foil part, the inside of the valve is evacuated through the exhaust pipe, the valve is immersed in liquid nitrogen, and the halogenated carbon Fill a mixed gas of hydrogen and an inert gas, tip off the exhaust pipe,
In manufacturing a halogen bulb, after the exhaust pipe is chipped off, prior to a lighting step including flashing, the entire bulb is heated to a temperature equal to or higher than the critical temperature of the halogenated hydrocarbon and equal to or lower than 350 ° C., so that the double-coil filament is heated. A method for producing a one-end-sealed halogen lamp, comprising vaporizing a halogenated carbide adhered to a surface.