JPH0357002Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-power incandescent light bulb, and more particularly to a high-output incandescent light bulb characterized by a structure in which an anchor is fixed to a glass bridge.

[Prior art and its problems]

For example, an incandescent light bulb with an output of 10 KW or more used as a heat source in an infrared heating furnace has a long filament coil, so the filament coil is held by an anchor. FIG. 1 shows an example of this high-output incandescent light bulb, in which a glass bridge 2 is installed in the radial direction of a quartz glass envelope 1.
A pair of lead rods 3 are rod-sealed in the sealing portion 11 of the enclosure 1, and a filament coil 4 is electrically connected to the lead rods 3. Since the filament coil 4 has a long overall length, in the illustrated example, it is divided into four parts, arranged in a plane, and connected in series. and,
It is held suspended by an anchor 5 fixed to the glass bridge 2. In addition to the illustrated example, the filament coils 4 can be arranged in a staggered manner to eliminate gaps in the plane direction to eliminate uneven light intensity, or arranged in a cylindrical shape to eliminate the directionality of light. However, in any case, it is held by an anchor 5 fixed to one glass bridge 2.

By the way, Anchor 5 is attached to this Glass Bridge 2.
Conventionally, as shown in FIG. 2, for example, an anchor 5 is sandwiched between two quartz glass rods 2a, and the anchor 5 is melt-bonded in the direction shown by the arrow. At this time, two glass rods 2a, 2a
This constitutes one glass bridge 2, but if the wire diameter of the glass rod 2a or the anchor 5 is large, welding tends to be insufficient, and the anchor 5 may rotate or
There are issues that can be overlooked. In addition, as shown in FIG. 3, a flat expanded portion 5 is provided near the upper end of the anchor 5, which has a filament coil holding portion 52 bent at the lower end.
1, while the glass bridge 2 has a hole 21.
However, since the holding part 52 is formed at the lower end of the anchor 5, it is not possible to insert the anchor 5 into the hole 21 from the lower end. They were placed in the same position and pressed from the direction shown by the arrow to melt and press-bond them. Therefore, it is necessary to make the inner diameter of the hole 21 larger than that of the flat expanded portion 51, and in order to weld the anchor 5 located in the center by heating and melting from the outer periphery of the glass bridge 2, the diameter of the glass bridge 2 is When the anchor 5 is large, the welding tends to be insufficient, and the problem of the anchor 5 rotating or falling off as in the example shown in FIG. 2 cannot be solved.

[Purpose of invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-output incandescent light bulb in which the anchor is securely fixed to the glass bridge with a simple structure and there is no risk of the anchor rotating or falling off.

[Structure of the idea]

The high-output incandescent light bulb of the present invention is a high-output incandescent light bulb in which an anchor for holding a filament coil is fixed to a glass bridge built in an enclosure, and the anchor is crushed into a rectangular shape with a flat cross section at one end. A flattened extension is formed, and the anchor is inserted into a hole drilled in the glass bridge, the inner diameter of which is approximately equal to the anchor wire diameter and smaller than the longitudinal dimension of the flattened extension, so that the flattened extension is removed from the outer surface of the glass bridge. It is characterized by being heated and welded.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

4 and 5 are explanatory diagrams of the fixing structure of the embodiment of the present invention. The anchor 5 is made of a molybdenum rod with a wire diameter of 1.0 mmφ, but as shown in FIG. is crushed into a flat rectangular shape to form a flat expanded portion 51, whose longitudinal dimension l is larger than the wire diameter. Initially, the anchor 5 is straight. On the other hand, the glass bridge 2 is made of a quartz glass rod or a high-purity silica glass rod with an outer diameter of 6.0 mmφ, and has an inner diameter slightly larger than the wire diameter of the anchor 5 in the radial direction, and extends along the longitudinal direction of the flat expanded portion 51. A hole 21 smaller than the dimension in the direction is bored. The anchor 5 is then inserted into the hole 21 so that the flat extension 51 engages with the outer surface of the glass bridge 2.
Next, the lower end of the anchor 5 is bent to form the filament coil holding portion 52, and the quartz glass in the portion where the flat extension portion 51 engages is heated and melted, as shown in FIG. Flat extension part 5
1 sinks somewhat and is welded to glass bridge 2. The glass bridge 2 is then installed within the envelope 1 as shown in FIG. 1, and the filament coil 4 is held by the holding portion 52 to complete a high output incandescent light bulb.

[Effect of idea]

In this way, the high output incandescent light bulb of the present invention has a flattened extension formed at one end of the anchor, and the anchor is inserted into a hole drilled in the glass bridge, the inner diameter of which is smaller than the longitudinal dimension of the flattened extension. Since the expanded portion is heated and welded from the outer surface of the glass bridge, the hole formed in the glass bridge may have a small diameter approximately equal to the diameter of the strand of the anchor. Since the glass bridge is not pressed and only the part where the flat extension part is engaged is heated, the manufacturing process is simplified, and the welded part is directly heated and melted, so welding is completed completely.
Coupled with the fact that the anchor does not rotate and the longitudinal direction of the flat extension is larger than the hole, it is possible to provide a high output incandescent light bulb with no risk of the anchor falling out.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a high output incandescent light bulb, Figures 2 and 3 are explanatory diagrams of a conventional example of the fixing structure of a glass bridge and anchor, and Figures 4 and 5 are also explanatory diagrams of an embodiment of the present invention. be. 1... Enclosure, 2... Glass bridge, 21...
Hole, 4... filament coil, 5... anchor, 51... flattened extension part, 52... holding part.

Claims (1)

[Claims for Utility Model Registration] A high-output incandescent light bulb in which an anchor for holding a filament coil is fixed to a glass bridge constructed within an envelope, wherein the anchor is crushed at one end into a rectangular shape with a flat cross section. A flattened extension is formed, and the anchor is inserted into a hole drilled in the glass bridge, the inner diameter of which is approximately equal to the anchor wire diameter and smaller than the longitudinal dimension of the flattened extension, so that the flattened extension is removed from the outside of the glass bridge. A high-output incandescent light bulb that is heated and welded from the surface.