JPH0427089Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an improvement of the filament support structure of a straight-tube halogen light bulb for copying machines, for example, by using metal foil to support the non-light-emitting part of the filament. be.

(Conventional technology and its problems) Halogen light bulb A is a high-brightness incandescent light bulb that uses a halogen cycle, and because of its characteristics, it is used in automobile headlights, copy machine light sources, and general lighting light sources. ing. Now, the halogen bulb A used as a light source for copying machines is usually a straight tube type as shown in Figure 5, and in order to adjust the amount of light, a molybdenum metal rod 6 is inserted into a part of the filament 9 and short-circuited to emit light. The portions 7 and the non-light emitting portions 5 are alternately formed, and a support ring 8 is further wound around the metal rod 6 to support the filament 9 at the center of the glass tube 4. 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, when external vibrations generated by reciprocating the halogen light bulb A are transmitted to the filament 9, the filament There was an accident in which the coil section 9 gradually shifted and the coil section, which is the light emitting section 7 section, became deformed, and the deformed section 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 wrap the extended portion of the filament around this to form a non-light-emitting portion. By doing so, it is possible to reduce the weight of the filament and provide a filament support structure for a halogen light bulb that does not cause any deformation or disconnection of the filament.

(Means for Solving the Problems) To achieve the above object; Supports 3 are formed by cutting out mounting grooves 20 on both side edges of metal foil.

Closely wound light emitting parts and stretched extension parts 5a are alternately formed on the filament.

The extension part 5a is fitted into the mounting groove 20 and wound around the support 3.

A technical measure is adopted in which the 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.

(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 the 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 around which the extended portion 5a of the filament 9 is wrapped is made of metal foil, the external vibration hardly acts on the filament 9. First, the filament 9 can be used for a long period of time without deformation or disconnection.

(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 4a and 4b used in the halogen light bulb A is, for example, quartz glass, but in the case of FIG.
A molybdenum metal foil 1a is embedded within a.
Filament 9 placed inside the inner glass tube 4a
Both ends of the molybdenum metal foil 1a are welded to the molybdenum metal foil 1a, and an intermediate lead rod 12 is further welded to the molybdenum metal foil 1a and led out.

The filament 9 is formed by alternately forming a tightly wound coil-shaped light emitting part 7 and an elongated part 5a in which the filament 9 is elongated. The support 3 is wrapped around the support 3.

Next, support 3 will be explained in detail. The metal foil is made of molybdenum and is rectangular, with V-shaped mounting grooves 20 on both sides of the support 3 as shown in Figure 4.
Generally, the mounting grooves 20 are formed in a staggered manner. The extended portion 5a of the filament 9 is wound around this support 3 and fitted into the mounting groove 20. This filament 9 is connected to the inner glass tube 4a.
When placed inside, the side edge of the support 3 comes into contact with the inner circumferential surface of the inner glass tube 4a, and the filament 9 naturally
is now located at the center of the inner glass tube 4a. The inner halogen bulb a thus formed is inserted into the outer glass tube 4b, and the inner halogen bulb a is inserted into the outer glass tube 4b.
b is evacuated, both ends are pinch-sealed and held between the pinch-sealed portions 10b. An external lead rod 11 is led out from the pinch seal portion 10b of the external glass tube 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, the manufacturing procedure will be explained. As shown in No. 2a, 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, the 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 the magnet 18, and the other end is Pull up filament 9.
As the magnetizable metal 17, for example, nickel is used. After performing such operations, the other end of the inner glass tube 4a is heated and pinch-sealed to form a pinch-sealed portion 10'a at the other end, and finally, the excess portion of the other end is cut off. In this way, the inner halogen light bulb a is constructed. continue,
After inserting the inner halogen bulb a into the outer glass tube 4a and evacuating the inside of the outer glass tube 4b, perform a pinch seal in the same way as before to hold the inner halogen bulb a inside, and then The configuration is assumed to be a halogen bulb A.

Note that the high wattage halogen bulb (not shown) does not have a double structure, and the inner halogen bulb a
Same method as manufacturing method or exhaust/chip pipe
Manufactured using the conventional method of filling with halogen gas.

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, most of the external vibrations are transmitted to the filament 9. Therefore, the filament 9 can be used for a long period of time without deformation or disconnection.

(Effects of the present invention) As described above, the present invention forms a support by cutting out mounting grooves on both sides of the metal foil, and forms a tightly wound light-emitting part and an elongated part in a stretched state on the filament. The filament is made of extremely lightweight metal foil, and is wrapped around the support so that the extension part is fitted into the mounting groove, and placed inside the glass tube so that the support is in contact with the inner circumferential surface of the glass tube. It is supported within the glass tube, and as a result, even if external vibrations are transmitted to the halogen bulb during the reciprocating movement of the halogen bulb, the metal foil that serves as the support will not shift due to external vibrations.
It has the advantage that it can be used for a long period of time without deforming the filament or breaking the wire. Furthermore, since the extended portion of the filament is wrapped around the 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. Since the support is recessed inside, the support will not fall off or shift from the extension.

Furthermore, as mentioned above, since the metal foil is used as a support, the distance in contact with the glass tube is much longer than that of conventional support rings, resulting in greater resistance when external vibrations are applied to the filament. However, it is very effective in preventing filament deformation and disconnection.

[Brief explanation of the drawing]

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 invention, Fig. 3... A front view of the inner halogen bulb of the invention, Fig. 4... An enlarged perspective view showing the support wrapped state of the invention. , FIG. 5... A front view of the conventional example. A...Halogen bulb, a...Inner halogen bulb, 1a, 1b...Molybdenum metal foil, 2...Filament mounting 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, 1
0a, 10a', 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...V groove.

Claims (1)

[Scope of utility model registration request] A support is formed by cutting out mounting grooves on both sides of the metal foil, forming closely wound light-emitting parts and stretched extension parts on the filament alternately, and fitting the extension parts into the mounting grooves to form a support. A filament support structure for a halogen light bulb, characterized in that the filament is wrapped around a glass tube, placed inside a glass tube, and has a support in contact with the inner peripheral surface of the glass tube.