JPH049729Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention mainly applies to spherical light bulbs,
The present invention relates to a filament element that has improved fluctuations in the light emitting characteristics of the filament when the width of the light emitting part of the filament is larger than the filament insertion opening of the bulb and the defective rate of products when sealed with the bulb.

[Prior art and its problems] Generally, the width L1 of the light emitting part of the filament disposed in the bulb 1 is larger than the width L2 of the filament insertion opening 2 of the bulb 1, for example, as a filament element B in a spherical light bulb, The one shown in FIG. 3 is known.

That is, both ends of the light-emitting part 3a of the horizontally wound filament are once bent toward the center of the light-emitting part 3a to form a continuous part 3b, and furthermore, these both ends have a width L2 of the filament insertion opening 2 of the bulb 1.
The leg portions 3c are bent parallel and perpendicularly downward with a narrower width. And this continuous part 3b
A substantially dogleg-shaped internal lead wire 4 is press-fitted into the leg portion 3c, and the lower end of the internal lead wire 4 is connected to the upper end of the external lead wire 5 via a molybdenum foil 6. An anchor 11 having one end fixed at the center of the portion 3a is vertically provided to constitute a filament element B.

In order to manufacture a spherical light bulb by inserting the filament element B configured in this way into the bulb 1 and sealing the filament insertion opening 2 of the bulb 1 and the filament element B by welding, the filament insertion opening of the bulb 1 must be inserted. 2, insert the light emitting part 3a of the filament in a compressed state, and when it is restored, the lower end of the leg part 3c of the filament, the lower end of the anchor 11,
It is manufactured by sealing the molybdenum foil 6 and the upper ends of the external lead wires 5 with the filament insertion opening 2 of the bulb 1 by welding.

However, such a filament element B
According to the configuration, when the light emitting part 3a of the filament is inserted into the bulb 1, when the light emitting part 3a is compressed and inserted into the bulb 1, the restoring force of the light emitting part 3a and the continuous part 3b causes both to return to their original positions. Both legs 3c, 3c and anchor 1
1 is a free end, so even if the filament does not return to its original position correctly, or even if it is correctly placed in the predetermined position, the filament insertion port 2 will cause the lower end of the leg 3c, the lower end of the anchor 11, the molybdenum foil 6 and When welding the upper end of the external lead wire 5, the anchor 11 swings out and cannot be fixed in the correct position, resulting in instability, resulting in a high defect rate of the product and problems such as large variations in the product during mass production. there were.

[Specific Means for Solving the Problems] The present invention was completed as a result of intensive experiments and research in order to solve these conventional problems. Both ends of the filament, which are larger than the diameter of the mouth, are bent toward the center of the filament to form a continuous part, and then bent downward in parallel with a width narrower than the diameter of the filament insertion opening of the valve to form the legs. In the formed filament element, an internal lead wire press-fitted into the coil of the leg and a separate core material are press-fitted into the continuous part between the light-emitting part and the leg of the filament, and the continuous part and the bent part of the leg are press-fitted into the continuous part between the light-emitting part and the leg. It is characterized by having a subcoil wound around it, and the legs and anchors being fixed with beads.

[Example] Hereinafter, an example of the filament element according to the present invention will be described based on the accompanying drawings.

In the figure, the same reference numerals as those in the conventional example indicate the same structures.

Filament element B configured similarly to the conventional example
A separate core material 7 made of the same material as the internal lead wire 4 press-fitted into the leg part 3c is press-fitted into the continuous part 3b between the light-emitting part 3a and the leg part 3c, and this continuous part 3b and the leg part 3c are A subcoil 8 is wound around the bent portion of the filament element A, and the center portions of the legs 3c, 3c and the lower end of the anchor 9 are fixed with beads 10.

After this filament element A is inserted into the bulb 1 in the same manner as in the conventional example, the lower end of the leg piece 3c, the molybdenum foil 6, and the upper end of the external lead wire 5 are welded and sealed through the filament insertion port 2 of the bulb 1. The spherical light bulb C is obtained.

[Effect of the invention] As described above, the present invention has a core material that is separate from the internal lead wire that is press-fitted into the coil of the leg part and is press-fitted into the continuous part of the filament element in the conventional light bulb of this type. A sub-coil is wound around the bend between the continuous part and the leg, and the leg and anchor are fixed with beads, so when inserting the filament into the bulb, the filament is compressed and the filament is compressed into the filament insertion opening of the bulb. Even if the filament is inserted and the pressure on the filament is released, the light-emitting part of the filament will return to its original position stably and correctly, and even if the bent part between the continuous part and the leg part bends and stretches when the filament is compressed or expanded. , it can prevent breakage and deformation of the bent part, and can be used in mass production.
There are various practical effects such as the ability to stably produce uniform products with a high yield.

[Brief explanation of the drawing]

Figures 1 and 2 show examples of the filament element according to the present invention. Figure 1 is a front view of the entire filament element, and Figure 2 is a state in which the filament element is sealed inside a spherical light bulb. FIGS. 3A and 3B are a partial sectional view of a conventional valve and a filament element. 1... Valve, 2... Filament insertion port, 3
a... Light emitting part, 3b... Continuous part, 3c... Leg part,
4...Internal lead wire, 5...External lead wire, 6...
... Molybdenum foil, 7 ... Core material, 8 ... Subcoil, 9 ... Anchor, 10 ... Bead, A ... Filament element.

Claims (1)

[Scope of utility model registration request] The width of the light-emitting part of the filament is larger than the diameter of the filament insertion opening of the bulb.After both ends of the filament are bent toward the center of the filament to form a continuous part, the width of the light-emitting part of the filament is narrower than the diameter of the filament insertion opening of the bulb. In a filament element whose legs are formed by bending parallel to the width downwards, an inner lead wire press-fitted into the coil of the leg and a separate core material are provided in the continuation between the light emitting part of the filament and the leg. 1. A filament element that is press-fitted and has a subcoil wound around the continuous part and the bent part of the leg part, and the leg part and the anchor are fixed with beads.