JPH0427090Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to improvements in the filament support structure of straight-tube halogen light bulbs for copying machines, for example, in which metal foil is used to support the non-light-emitting part of the filament. It is something.

(Conventional technology and its problems) Halogen light bulb A is a high-brightness incandescent light bulb that uses a halogen cycle, but because of its characteristics, it is used in automobile headlights, copy machine light sources, and general lighting light sources. There is. Now, the halogen bulb A used as a light source for copying machines is usually a straight tube type as shown in Fig. 6, and in order to adjust the light intensity, a molybdenum metal rod 6 is inserted into a part of the filament 9 and short-circuited to emit light. The filament 9 was supported at the center of the glass tube 4 by forming portions 7 and non-light emitting portions 5 alternately, and by wrapping a support ring 8 around the metal rod 6. However, since the molybdenum metal rod 6 is a solid body, it is heavier than the filament 9. For example, when used in a copying machine, external vibrations generated by reciprocating the halogen light bulb A are transmitted to the filament 9. There was an accident in which the filament 9 gradually shifted and the coil section, which is the light emitting section 7, was deformed, and the deformed portion caused a wire breakage. Currently, machine cycles tend to become faster, and it is expected that deformation of the filament 9 and disconnection accidents will increase.

The present invention was devised in view of the drawbacks of the conventional examples, and its purpose is to use an extremely lightweight metal foil as a support, and to attach the light emitting part of the filament to this support. Accordingly, it is an object of the present invention to provide a filament support structure for a halogen light bulb, which reduces the weight of the filament and prevents deformation of the light emitting part of the filament and disconnection accidents.

(Means for solving the problem) To achieve the above object; The light emitting part 7 of the filament 9 is connected to the support 3 made of metal foil, and the light emitting part 7 and the non-light emitting part 5 are connected. Alternating filaments 9 are formed.

The cut portions 20 are supported in a zigzag pattern in a direction intersecting the longitudinal direction of the filament 9.
Cut it to .

A filament 9 is placed inside the glass tube 4, and the support 3 is brought into contact with the inner peripheral surface of the glass tube 4.

; is adopted as a technical means.

(Function) When the straight tube halogen bulb A is attached to, for example, a copying machine and the copying machine is operated, the halogen bulb A lights up just before the halogen bulb A is activated and moves while irradiating the document. When the irradiation of the original is completed, the halogen bulb A is turned off, and copying is completed. During this reciprocating motion of the halogen bulb A, external vibrations are transmitted to the halogen bulb A, but since the support 3, which is the non-light emitting part 5 of the filament 9, is made of metal foil, the external vibration hardly acts on the filament 9. , it can be used for a long period of time without deformation or breakage of the filament 9.

(Example) Hereinafter, the present invention will be explained according to the illustrated example.
FIG. 1 is a front view of a low-wattage type halogen light bulb A with a double structure according to the present invention. Now, the material of the inner and outer glass tubes 4a4b used in the halogen light bulb A is, for example, quartz glass, but in the case of FIG. 1, both ends of the glass tube 4a are pinch-sealed, and this pinch-sealed portion 10a
A molybdenum metal foil 1a is embedded therein. Both ends of the filament 9 disposed in the inner glass tube 4a are welded to this molybdenum metal foil 1a, and an intermediate lead is welded to the molybdenum metal foil 1a.
A dowel rod 12 is welded and led out.

The first embodiment of the filament 9 is an example in which a tightly wound coil-shaped light emitting part 7 is connected to the end of the support 3 by welding or pressure welding, and the second embodiment is shown in FIGS. 4 and 5. Extended portions 5a in which the filament 9 is stretched and light emitting portions 7 are alternately formed, and a support 3 made of molybdenum metal foil, which will be described later, is connected to the elongated portions 5a by welding or pressure welding. This is an example.

Next, support 3 will be explained in detail. The metal foil is made of molybdenum and is rectangular.
As shown in the figure, a large number of notches 20 are cut into the support 3. In the illustrated case, the cutting direction of the cut portion 20 is substantially perpendicular to the longitudinal direction of the support 3 (filament 9). (The direction of the cut is not limited to the one shown in the figure, but may be any direction that intersects the longitudinal direction of the support 3.) In addition, the cut 20 is alternately open at the side edge in the case shown in the figure and not open at the side edge. Of course, this is not limited to this, but any type of support that can be extended as shown in FIG. 5 if the support 3 is pulled in the longitudinal direction is included. The light emitting portion 5 of the filament 9 is welded or pressure-bonded to both ends of the support 3. When the filament 9 thus formed is placed inside the inner glass tube 4a while being stretched in the longitudinal direction, the side edge of the support 3 will come into contact with the inner peripheral surface of the inner glass tube 4a, and the filament 9 will naturally move. Inner glass tube 4a
At the same time, as shown in FIG. 5, the support 3 is pulled in the longitudinal direction and becomes elastic, applying a tensile force to the light emitting part 7. The inner halogen light 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 the bulb is held between the pinch-seal parts 10b. An external lead rod 11 is led out from the pinch seal portion 10b between the external glasses 4b, and a metal terminal 14 is butt-welded to the tip thereof. Further, an insulator 13 is bonded to the pinch seal portion 10b, and holds the metal terminal 14.

Next, we will explain the manufacturing procedure. As shown in FIG. 2, 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 part 10a facing down, the inner glass tube 4a is erected and held by the handle part 19,
An exhaust device 16 is connected to the other end, and the inside of the inner glass tube 4a is first evacuated to a high vacuum, and then halogen gas is filled. At this time, the pinch seal portion 10a of the inner glass tube 4a and its vicinity are cooled with liquid nitrogen so that concentrated halogen gas accumulates in the lower part of the inner glass tube 4a. Next, a magnetizable 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 magnetically attached with a magnet 18. Pull up the filament 9 towards the end. As the magnetizable metal 17, for example, a material such as nickel is used. After performing such an operation, the other end of the inner glass tube 4a is heated and pinch-sealed, and a pinch-sealed portion 10'a is attached to the other end.
, and finally cut off the excess at the other end. In this way, the inner halogen light bulb a is constructed. Next, the inner halogen bulb a is inserted into the outer glass tube 4a, and after evacuating the inside of the outer glass tube 4b, a pinch seal is performed in the same manner as before to hold the inner halogen bulb a inside, and the tip tube is closed. Use a dual configuration halogen bulb without.

Note that the high wattage halogen bulb A does not have a double structure, but is manufactured in the same manner as the inner halogen bulb A, or by the conventional method of exhausting and filling with halogen gas using a tip tube.

When a straight-tube halogen light bulb A as shown in Fig. 1 is attached to, for example, a copying machine and the copying machine is operated, the halogen light bulb A lights up just before the halogen light bulb A is activated, illuminating the original while Moving. When the irradiation of the original is finished, the halogen bulb A turns off.
Copying is completed and at the same time halogen bulb A returns to its home position. During this reciprocating movement of the halogen bulb A, external vibrations are transmitted to the halogen bulb A, but since the support 3 disposed along the non-light emitting part 5 of the filament 9 is made of metal foil, the external vibrations are transferred to the filament 9. It has almost no effect on the filament 9, and can be used for a long period of time without deforming or breaking the filament 9.

(Effects of the present invention) As described above, the present invention connects the light emitting part of the filament to a support made of metal foil to form a filament in which light emitting parts and non-light emitting parts are alternately provided. Cut the notches into the support in a staggered manner in a direction that intersects the longitudinal direction of the filament.
Since the filament is placed inside the glass tube and the support is in contact with the inner circumferential surface of the glass tube, the filament is supported inside the glass tube using an extremely lightweight metal foil, and as a result, the halogen light bulb During the reciprocating motion of the halogen bulb, even if external vibrations are transmitted to the halogen bulb, the supporting metal foil will not shift due to external vibrations, and the filament can be used for a long period of time without deformation or disconnection. It has the advantage of being able to be used while holding it. Further, since the metal foil is used as a support, there is an advantage that the filament can be positioned at the center of the glass tube simply by inserting the filament into the glass tube.

In addition, since the notches are cut in the support in a staggered manner in a direction that intersects the longitudinal direction of the filament, the support itself is given elasticity, making it suitable for long-term use. Even if the coil-shaped light-emitting part stretches, the support absorbs this stretch, preventing the filament from sagging, and has the advantage of preventing the glass tube from bursting.

As mentioned above, since metal foil is used as a support, the distance in contact with the glass tube is much longer than that of conventional support rings, which creates greater resistance when external vibrations are applied to the filament. In this respect as well, it is very effective in preventing filament deformation and wire breakage.

[Brief explanation of drawings]

Figure 1: Front view of the first embodiment of the present invention, Figure 2
Fig. 3: A front view showing the processing procedure of the first embodiment of the present invention; Fig. 3: A front view of the inner halogen bulb of the present invention; Figs. 4 and 5: Applying tension to the support of the present invention. Figure 6 is an enlarged perspective view showing the state after addition...
Front view of a conventional example. A...Halogen bulb, a...Inner halogen bulb,
1a, 1b...Molybdenum metal foil, 2...Filament attachment part, 3...Support, 4, 4a, 4b
...Glass tube, 5...Non-light emitting part, 5a...Extension part, 6...Molybdenum metal rod, 7...Light emitting part, 8
...Support ring, 9...Filament, 10
a, 10'a, 10b...Pinch seal part, 11
...External lead rod, 12...Intermediate lead rod, 13
... Insulator, 14 ... Metal terminal, 16 ... Exhaust device, 17 ... Magnetizable metal, 18 ... Magnet, 19
...handle part, 20...notch part.

Claims (1)

[Claims for Utility Model Registration] (1) A filament in which a light-emitting part of a filament is connected to a support made of metal foil to form a filament in which a light-emitting part and a non-light-emitting part are provided alternately, and The support is characterized by cutting notches into the support in a staggered manner in a direction crossing the glass tube, placing the filament inside the glass tube, and making contact with the support against the inner circumferential surface of the glass tube. Filament support structure for halogen light bulbs. (2) The filament support structure for a halogen light bulb according to claim 1, wherein the notch is cut in a direction substantially perpendicular to the longitudinal direction of the filament. (3) According to claim 2, the device is formed by alternately cutting cut portions that open on the side edges of the support and cut portions that do not open on the side edges of the support. Filament support structure for halogen light bulbs.