JPH0610975B2 - Halogen bulb manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a method for manufacturing, for example, a straight tube type halogen light bulb for a copying machine using a metal foil as a support for a filament.

(Prior art and its problems) Halogen light bulb (A) is a high-intensity incandescent light bulb that uses a halogen cycle, but due to its features, it can be used as a light source for automobile headlights, copiers, general lighting, etc. It is used. Now, the halogen bulb (A) used as the light source of the copying machine is usually a straight tube type as shown in Fig. 7, and a molybdenum metal rod (6) is provided on a part of the filament (9) to adjust the light quantity.
Insert and short-circuit, alternately form the light-emitting part (7) and the non-light-emitting part, further wrap the support ring (8) around the metal rod (6) and attach the filament (9) to the center of the glass tube (4). I was trying to support. However, since the molybdenum metal rod (6) is a solid body, it has a larger weight than the filament (9) .For example, when used in a copying machine, external vibration generated by reciprocating the halogen bulb (A) is generated. When transmitted to the filament (9), there was an accident in which the filament (9) was gradually displaced and the deformed portion of the coil portion, which is the light emitting portion (7), caused the disconnection. At present, the machine cycle tends to be faster, and it is expected that the filament (9) will be deformed and the number of wire breakage accidents will increase.

In addition, the demand for low watt halogen light bulbs (A) for light sources has increased with the spread of facsimiles and personal copying machines, which have significantly slower document movement speeds than commercial copying machines.
If the wattage of the halogen bulb (A) is reduced, it will be necessary to use a double tube as shown in FIG. That is, when the wattage becomes low, the calorific value of the halogen bulb (A) decreases, and heat is exerted by convection, radiation, and heat transfer, and the temperature that causes the halogen cycle is not reached. Therefore, in order to prevent heat loss due to convection and to secure a temperature at which the halogen cycle is generated, it is necessary to have a double structure with a vacuum inside. However, in the case of a double structure, if the sealed tip tube projects from the inner glass tube, the tip tube portion approaches the outer glass tube. You have to make the tube thicker. Even with the conventional high watt halogen bulb (A), the tip tube (11) may be an obstacle depending on the structure of the equipment to be installed, and depending on the application, the halogen bulb without the tip tube (11) (A ) Was requested.

The present invention has been made in view of the drawbacks of the conventional example, and the first purpose thereof is to perform filament pulling in a non-contact manner. Of course, another object of the present invention is to provide a method for manufacturing a halogen bulb that does not cause a tip tube even in a conventional high wattage lamp.

(Means for Solving Problems) In order to achieve the above-mentioned object; a filament (9) having a magnetic metal (17) adsorbed by a magnet (18) connected to one end is provided in a glass tube (4). To place.

One end of the glass tube (4) is pinch-sealed and the other end of the filament (9) is embedded in the pinch-seal part (10).

From the other end of the opening of the glass tube (4) to the glass tube (4) after or at the same time as or before the sealing of the halogen gas into the glass tube (4), the magnetic metal (17) is magnetized by the magnet (18) to the glass tube (4). Suction from the outside and pull the filament (9) toward the other end.

After enclosing a halogen gas from the other end of the opening of the glass tube (4), the magnetic metal (17) is applied to the glass tube by the magnetic force of the magnet (18).
(4) Pinch the other end of the glass tube 4) while sucking from the outside.

Pinch seals (1
The filament (9) is installed between 0).

Is adopted as a technical means.

(Working) However, if the straight tube type halogen bulb (A) is installed in, for example, a copying machine and the copying machine is operated, the halogen bulb (A) lights up immediately before the halogen bulb (A) operates, and the original is Move while illuminating. The halogen bulb (A) is turned off when the document irradiation is completed, and copying is completed. During this reciprocating movement of the halogen bulb (A), external vibration is transmitted to the halogen bulb (A), but it is arranged along the non-light emitting portion (5) of the filament (9) to the non-light emitting portion (5). Since the supporting body (3) holding it is a metal foil (1), external vibration hardly acts on the filament (9), and it can be used for a long time without deformation of the filament (9) or accidental disconnection. .

(Examples) The present invention will be described below with reference to illustrated examples. FIG. 1 is a front view of an example of a double-structured straight tube type halogen bulb (A) according to the present invention, which has a low wattage. By the way, the material of the inner and outer glass tubes (4a) and (4b) used for the halogen bulb (A) is, for example, quartz glass.
Both ends of (4a) are pinch-sealed, and molybdenum metal foil (1a) is embedded in this pinch-sealed portion (10a). Filament (9) placed in the inner glass tube (4a)
Both ends of are welded to this molybdenum metal foil (1a),
Further, the intermediate lead rod (12) is welded and led out from the molybdenum metal foil (1a). Filament (9)
Is a densely wound coil-shaped light emitting part (7) and a non-light emitting part (5) in which the filament (9) is stretched are alternately formed. A support (3) made of molybdenum metal foil is wound around.

Hereinafter, the support (3) will be described in detail. The metal foil is made of molybdenum, has a rectangular shape, and is pressed into a shape in which both ends are folded and the central portion is expanded as shown in FIG. 5 (b). When viewed from the side, it has a V shape as shown in FIG. Of course, it may be flat, but in that case, it is necessary to alternately arrange the supports (3) horizontally and vertically. The support (3) is placed along with the non-light emitting part (5) of the filament (9), and the filament attachment parts (2) at both ends of the support (3) are attached to the non-light emitting part (5) of the filament (9). ) Is welded or pressure welded to the filament (9)
Hold (5) with the filament support (3). Then, the sixth
As shown in the figure, when the cross-sectional shape is V-shaped, it is as if the molybdenum metal foil (1) contacts three points on the inner surface of the glass tube (4).
Behaves like a point support, with the filament (9) inside the glass tube
It will be located at the center of (4a). Further, when the support (3) has a flat central cross-sectional shape, the filaments (9) can be positioned in the center of the glass tube (4a) by alternately arranging them horizontally and vertically. The inner halogen bulb (a) thus formed is inserted into the outer glass tube (4b), the inside of the outer glass tube (4b) is evacuated, both ends are pinch-sealed, and held between the pinch-sealing parts (10b). Will be done. The external lead rod (15) is led out from the pinch seal portion (10b) of the external glass tube (4b), and the metal terminal (13) is butt-welded to the tip thereof. Also, the pinch seal part (10) (1
Insulator (14) is bonded to (0b), the metal terminal (13)
Holding a.

Next, the manufacturing procedure will be described. As shown in FIG.
The filament (9) is inserted into the inner glass tube (4a), and one end of the inner glass tube (4a) is pinch-sealed. Next, with the pinch seal (10a) facing down, use the handle (19) to hold the inner glass tube.
(4a) is erected and held, and an exhaust device (16) is connected to the other end. First, the inside glass tube (4a) is evacuated to a high vacuum, and then halogen gas is filled. At this time, the inner glass tube (4a) pinch seal portion (10a) and its vicinity are cooled with liquid nitrogen,
The concentrated halogen gas is allowed to collect in the lower part of the inner glass tube (4a). Subsequently, a magnetic metal (17) connected to the other end of the filament (9) from the outside of the inner glass tube (4a) (in other words, butt-welded to the intermediate lead rod (12)) is connected to the magnet (18). Suction by magnetic force and filament toward the other end
(9) is pulled up. Magnetic metal (1
For example, nickel-like material is used as 7). After performing such an operation, the other end of the inner glass tube (4a) is heated to perform a pinch seal, a pinch seal portion (10a) 'is formed at the other end, and finally the surplus portion at the other end is cut off. To do.
In this way, the inner halogen bulb (a) is constructed. Then, insert the inner halogen bulb (a) into the outer glass tube (4a), exhaust the inside of the outer glass tube (4b), and then perform a pinch seal in the same way as in the past to perform the inner halogen bulb (a) inside. ) Is retained, and it is a double-configuration halogen bulb without a tip tube.

The high-watt halogen light bulb (A) does not have a double structure, and is manufactured by the same method as the inner halogen light bulb (a).

Then, a straight tube type halogen bulb (A) as shown in FIG.
When, for example, is mounted on a copying machine and the copying machine is operated, the halogen bulb (A) is lit immediately before the halogen bulb (A) is activated, and the document moves while illuminating the original. The halogen bulb (A) is turned off when the irradiation of the original is finished, copying is completed, and at the same time, the halogen bulb (A) is returned to the home position. During this reciprocating movement of the halogen bulb (A), external vibration causes the halogen bulb (A)
However, since the support (3) that surrounds the non-light-emitting part (5) of the filament (9) is a metal foil, external vibration hardly acts on the filament (9), and the deformation of the filament (9) occurs. It can be used for a long period of time without a wire breakage accident.

(Effect of the present invention) As described above, the present invention arranges a filament whose one end is connected to a magnetic metal attracted by a magnet in a glass tube, and then pinches one end of the glass tube to remove other filaments. The end is embedded in the pinch seal part, and after that, after the halogen gas is filled into the glass tube from the other end of the opening of the glass tube, at the same time as before the sealing or before the sealing, the magnetic metal is magnetized by the magnet to the outside of the glass tube. The glass tube is drawn from the outside of the glass tube while attracting the magnetic metal from the outside of the glass tube by the magnetic force of the magnet after enclosing the halogen gas from the other end of the opening of the glass tube. It is characterized by pinch-sealing and installing a filament between the pinch-sealing portions formed at both ends of the glass tube.However, as described above, the magnetic metal is attracted from the outside of the glass tube by the magnetic force of the magnet. , The filament can be pulled in a non-contact manner, and after the halogen gas is sealed from the other end of the opening of the glass tube, the other end of the glass tube is attracted by the magnetic force of the magnet from the outside of the glass tube. Since it is pinch-sealed, the air inside the glass tube can be eliminated and the halogen gas can be filled in using the other end of the glass tube without using the chip tube. There is an advantage that the tube can be eliminated, and in the case of the double structure, not only the outer glass tube can be made thin, but also the appearance of the single tube can be improved.

[Brief description of drawings]

FIG. 1 ... Front view of an embodiment of a low watt halogen light bulb of the present invention FIG. 2 ... Front view of the manufacturing procedure of the present invention FIG. 3 ... Front view of an inner halogen light bulb of the present invention FIG. ...... Front view of one embodiment of the high watt halogen light bulb of the present invention Fig. 5 (a) (b) ...... Front view showing the manufacturing procedure of the support of the present invention Fig. 6 ...... Inner halogen light bulb of the present invention Enlarged sectional view of Fig. 7 …… Front view of conventional example (A) …… Halogen bulb, (a) …… Inside halogen bulb (1) (1a) (1b) …… Molybdenum metal foil (2) …… Filament Mounting part (3) …… Support, (4a) (4b) …… Glass tube (5) …… Non-light emitting part, (6) …… Molybdenum metal rod (7) …… Light emitting part, (8) …… Support ring (9) …… Filament, (10a) (10b) …… Pinch seal part (11) …… Tip tube, (12) …… Intermediate lead rod (13) …… Metal terminal, (14) …… Insulator (15) …… External lead rod, (16) …… Exhaust device (17) ... magnetic metal, (18) magnet (19) ...... grip portion

Claims (1)

[Claims] 1. A filament, one end of which is connected to a magnetic metal attracted by a magnet, is placed in a glass tube, one end of the glass tube is pinch-sealed, and the other end of the filament is embedded in a pinch-sealed portion. After that, after the halogen gas is filled into the glass tube from the other end of the opening of the glass tube, at the same time as or before the filling, the magnetic metal is attracted from the outside of the glass tube by the magnetic force of the magnet to open the filament toward the other end of the opening. After enclosing the halogen gas from the other open end of the glass tube, pinch seal the other end of the glass tube while attracting the magnetic metal from the outside of the glass tube with the magnetic force of the magnet to form at both ends of the glass tube. A method of manufacturing a halogen light bulb, characterized in that a filament is installed between the pinched seal portions.