JPH071689B2 - Halogen bulb manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a halogen bulb.

2. Description of the Related Art A conventional method for manufacturing a single-ended sealed halogen light bulb is as follows. That is, both legs of a filament coil provided in a glass tube are connected to two internal lead wires, and the other end of the internal lead wires is connected to the upper end of a metal foil made of molybdenum foil or the like. Connect the external lead-in wire to the bottom edge of the foil. A glass bead is welded between the two internal lead wires, and one end of the filament coil upper support wire and the filament coil lower support wire are embedded in the glass bead. The other end of the upper support wire extends to the upper portion of the filament coil, and the tip end is bent into a hook shape, and the hook-shaped portions support the filament coil space portions at the facing portions. Similarly, the lower support wire is bent at its tip end into a hook shape, and the hook-shaped portions support the filament coil space portions at the facing portions. The mount including the filament coil supported by the above is housed inside the glass tube except for a part of the external introduction wire so that the filament coil is positioned vertically along the axis of the glass tube. It is supported by the part of the external lead wire that goes out of the glass tube. Then, both metal foils and the end portions of the glass tube surrounding a part of the internal introduction wire and a part of the external introduction wire connected to these metal foils are heated by a burner to melt and seal the glass. As the glass solidifies, the mount containing the filament coil is fixed inside the glass tube.

However, in such a conventional method, the filament coil may not be fixed at a position along the axis of the glass tube. That is, when sealing the lower end of the opening of the glass tube, a filament coil provided in the glass tube,
While holding the mount formed by the supporting wire, the glass bead, the internal lead-in wire, the metal foil and the external lead-in wire that supports this with a part of the external lead-in wire outside the glass tube, Must be melted by heating and sealed. However, the metal foil located below the mount has a very thin thickness so that the end portion of the glass tube can be reliably sealed and sealed in the end portion. Therefore, the metal foil is easily bent, and it becomes difficult to support the mount at a position along the axis of the glass tube, and thus the filament coil is often displaced when sealing the glass tube.

The displacement of the filament coil in the glass tube is
When the bulb is lit, it promotes non-uniformity of the wall temperature of the glass tube, dissipates the normal convection of the halogen gas enclosed in it, and causes imbalance in the halogen cycle, resulting in a shorter life. In addition, the glass tube may be softened and expanded due to heat, which may cause damage. Further, the inclination of the filament coil due to the axial misalignment gives an unreasonable load to the filament coil during lighting, promotes the deformation of the filament coil, and causes arc breakage. Further, the positional deviation of the filament coil often causes a problem in practical use when the halogen bulb is attached to a lighting fixture that uses an optical system, because the light distribution is distorted.

The present invention has been made to solve such a problem, and provides a method for manufacturing a halogen bulb in which a filament coil can be reliably and correctly provided in a position along the axis of the glass tube. To do.

Means for Solving the Problems In order to solve this problem, the present invention provides two segments positioned in the middle of a plurality of segments of a planar filament coil provided in a glass tube having an exhaust pipe at the crown. By inserting the tip end portion of the guide rod through the exhaust pipe, the filament coil is held at a predetermined position, the lower end portion of the opening of the glass tube is sealed, and then the guide rod is pulled out. A method for manufacturing a halogen light bulb in which an exhaust pipe is chipped off, wherein the guide rod has two segments, each of which has a bifurcated tip portion and an interval between the bifurcated tip portions is intermediate between a plurality of segments of the filament coil. It has the structure formed according to the pitch interval of.

Action With this configuration, the filament coil is held in the normal position along the axis of the glass tube by the guide rod inserted into the segment of the filament coil through the inside of the exhaust tube.

Embodiment FIG. 1 is a process drawing of a method for manufacturing a halogen light bulb according to an embodiment of the present invention.

As shown in FIG. 1, the two legs of the filament coil 2 provided in the glass tube 1 made of quartz or the like are connected to one ends of the two internal lead wires 4 and 5, and the internal lead wires The upper ends of the metal foils 6 and 7 made of molybdenum are connected to the other ends, and the external introduction wires 8 and 9 are further connected to the lower ends of the metal foils 6 and 7. Filament coil 2 consists of segments 2a, 2b, 2c, 2d, 2
e, 2f and a space portion formed between each segment, and a foot portion formed in the segments 2a, 2f. Weld a glass bead 10 made of quartz between the two internal lead wires 4 and 5,
A supporting wire 1 made of tungsten is attached to the glass bead 10.
One end of 1,12,13 and supporting wires 14,15 is buried. Support line
The other ends of the members 14 and 15 are bent in a hook shape, and the hook-shaped portions support the filament coil space portions facing each other. The other ends of the support wires 11, 12, 13 extend upward along the back surface of the filament coil 2, are bent at a substantially right angle from a position slightly higher than the upper space portion of the filament coil 2, and have a hook-shaped portion at the tip thereof. It is formed. These hook-shaped portions support the filament coil space portions at the facing portions. The two forked ends of the guide rod 16 made of tungsten lowered into the glass tube 1 are passed through the exhaust tube 3 having an inner diameter of 1.8 mm located at the central crown of the glass tube 1 and the middle of the filament coil 2 is inserted. It is inserted into the hollow holes of the coils of the two segments 2c and 2d located at. At this time, a part of both ends of the guide rod 16 abut on the inner surfaces of the coils of the segments 2c and 2d, so that the filament coil 2 is supported by the guide rod 16.

FIG. 2 is a front view of the guide rod 16 having a wire diameter of 0.34 mm.
Bend the tungsten rod with a radius of 0.3 mm in the center, and then weld the tungsten rod with a wire diameter of 0.12 mm in a coil shape 5 mm around the tip of these two tungsten rods by 30 mm, and weld it to the guide rod 16 And the stator 17 of. further,
The part where the guide bar 16 is split into two parts from the position fixed by the stator 17 is bent so as to keep the interval of 3.0 mm which matches the pitch interval of the two segments 2c and 2d located in the middle of the filament coil 2, And one of the tips from the other
Cut into 2mm and cut. This is combined with the fact that it is easy to insert the tip end portion of the guide rod 16 into the segment of the filament coil 2 as shown in FIG.
The heat applied when sealing the lower end of the opening of the glass tube 1 prevents the guide rod 16 inserted into the segment of the filament coil 2 from applying a tension and distorting the shape of the filament coil 2. Also the stator
The guide rod 16 bent from the upper portion from 17 with a rounded tip is spaced so that a part of the guide rod 16 contacts the inner surface of the exhaust pipe 3, and the guide rod is placed inside the exhaust pipe 3. It is designed to be loosely held in place. further,
When sealing the lower end of the opening of the glass tube 1, an inert gas is fed into the glass tube 1 through the exhaust pipe 3 to protect the metal in the glass tube 1 from being oxidized. The wire diameter and the shape of the guide rod 16 are determined so as not to obstruct. Then, the guide rod 16 is lowered through the exhaust pipe 3, and two segments 2c having an inner diameter of 0.9 mm, which are located in the middle of the filament coil 2 in the glass tube 1,
With the guide rod 16 inserted in the hollow hole of the 2d coil,
The end portion including the bent portion has a length protruding from the exhaust pipe 3 by 5 mm. This is to facilitate the removal of the guide rod 16 from the exhaust pipe 3 after sealing the glass tube 1.

In the mount including the filament coil 2 covered with the glass tube 1, the external introduction wires 8 and 9 are fixed at the portions outside the glass tube 1, and the metal foils 6 and 7 and the internal introduction wire 4 connected thereto. , 5 and parts including the external introduction lines 8 and 9 are sealed. The filament coil 2 is held by the guide rod 16. After the sealing process is completed and the mount is hermetically fixed to the glass of the sealing portion, the guide rod 16 is pulled out through the exhaust pipe 3. After that, the inside of the glass tube 1 is exhausted through the exhaust pipe 3, the halogen gas is enclosed in the glass pipe 1 from the exhaust pipe 3 together with the rare gas, and the exhaust pipe 3 is chipped off.

EFFECTS OF THE INVENTION As described above, according to the present invention, the filament coil can be surely arranged at the position along the axial center in the glass tube, so that the following effects can be obtained.

(1) A filament coil caused by an imbalance of convection activity of a halogen gas enclosed in a glass tube, which can minimize the temperature nonuniformity of the tube wall due to an abnormal approach to the glass tube wall due to the displacement of the filament coil. It is possible to prevent abnormal wear of the lamp and prevent the occurrence of a short lamp life.

(2) It is possible to prevent the glass tube from being deformed and damaged due to an abnormally high temperature of a part of the glass wall caused by an abnormal approach of the filament coil to the glass tube wall.

(3) Since the filament coil can be prevented from being deformed without imposing an unreasonable load on the filament coil during lighting, disconnection due to arc generation can be prevented.

(4) Even if a halogen bulb is attached to the lighting equipment, the light distribution is not affected.

[Brief description of drawings]

FIG. 1 is a process diagram of a method for manufacturing a halogen bulb according to an embodiment of the present invention, FIG. 2 is a front view showing an example of a guide rod, and FIG. 3 is a front view of a main part of a mount. 1 ... Glass tube, 2 ... Filament coil, 2a, 2b, 2
c, 2d, 2e, 2f …… Segment, 3 …… Exhaust pipe, 4,5 …… Internal lead wire, 6,7 …… Metal foil, 8,9 …… External lead wire, 10 ……
Bead glass, 11,12,13,14,15 …… supporting wire, 16 …… guide rod, 17 …… stator.

Claims (1)

[Claims] 1. A tip portion of a guide rod is inserted into two segments located in the middle of a plurality of segments of a planar filament coil provided in a glass tube having an exhaust pipe at the top thereof, through the exhaust pipe. By holding the filament coil in a predetermined position and sealing the lower end of the opening of the glass tube, the guide rod is removed, and the exhaust tube is chipped off. The guide rod is characterized in that the tip portion is bifurcated, and the interval between the bifurcated tip portions is formed in accordance with the pitch interval of two segments positioned in the middle of the plurality of segments of the filament coil. Halogen bulb manufacturing method.