JPS61131359A - Lead-in wire for electric bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lead-in wire that is used for bulbs such as general light bulbs and high-pressure discharge lamps and has both the functions of a sealing lead-in and a fuse.

[Technical background of the invention and its problems]

Conventionally, in this type of bulb, it is known that the outer conductor of the lead-in wire is provided with a fuse function so that when an excessive current is applied, the fuse is reliably blown to protect the bulb body. As such lead-in wires, metal wires such as monel metal or pure nickel are used for the outer conductor, as they are excellent in conductivity and weldability, and are made of materials that are easy to process. Since such a metal wire functions as a fuse, the wire diameter is determined based on the overcurrent fusing characteristics. In other words, the metal wire is regulated so that it melts due to the electric resistance value of the metal wire and the Joule heat proportional to the electric resistance value. Generally, a wire diameter of about 0.20 mm is suitable for a light bulb used in a 100V power supply, and has been put into practical use.

However, in the current industrial methods, such a wire diameter is too small and may cause problems in the process. In other words, when welding lead-in wires for three parts using such a wire, it is difficult to obtain straightness of the wire, resulting in defects such as incomplete butt welding. Furthermore, when assembling the light bulb, the wire forming does not follow the jig,
There were drawbacks such as difficulty in inserting and assembling the cap into the eyelet. In addition, there was a problem in the wire connection work by welding to the base skirt part, which was prone to fusing.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lead-in wire for a tube whose rigidity is strengthened without impairing the fuse function of the outer conductor, thereby facilitating processing and assembly operations and improving yield.

[Summary of the invention]

The above-mentioned object has been achieved by constructing the external wire of the lead-in wire from an alloy consisting of 63 to 70% by weight of nickel, 2 to 8% by weight of manganese, and the rest being copper, and by providing it with a fuse function.

[Embodiments of the invention]

The details of the invention will be explained by means of illustrated embodiments.

■ is a glass bulb, ■ is an E-shaped cap attached to the end of this bulb ■, ■ is a filament or light emitting member sealed inside the bulb ω, and ni), ni) is a bulb connected to this light emitting member ■. (2) A pair of lead-in wires led out from the end and connected to the base.

The above valve ■ is A type with a flared stem (11) at its end.
The exhaust pipe (12) is then sealed.

The above cap ■ has an insulating glass (22) on the cap shell (21).
The shell (21) is fitted onto the end of the bulb with an eyelet or terminal portion (23) connected thereto and fixed with adhesive (24).

As shown in Figure 2, the lead-in wire (above) is an inner conductor wire (41) made of nickel-plated iron wire and an outer conductor wire (42) made of a three-component alloy of nickel, manganese, and copper, sealed together with a Dumet wire. The sealed wire (43) is sealed to the stem (11) and the inner conductor wire (41) is connected via the wire (43).
is extended into the bulb ω to support the light emitting member ■, and an external sensing wire (42) is led out from the stem (11) into the cap shell (21), one of which is inserted into the through hole (23) of the terminal portion (23). 25) and is electrically connected to the outer surface of the terminal portion (23) with solder (26), and the other one is led out from the edge of the base shell (21), folded back, and welded to the outer surface of the shell (21). . The wire diameter of the external sensing wire (42) is determined so that it will surely melt if a current exceeding the safe current flows through the bulb.

Therefore, the fusing current required for the external sensing wire (42) of this type of lead-in wire is determined by the standard. The safe fusing current is specified as follows.

Fused at the same time as the switch is turned on...38±IA Fused 1 minute after the switch is turned on...34±2A Fused 2 minutes after the switch is turned on...32±2A Then, The external wire (42) of this example has a suitable amount of manganese added in order to make it higher in resistivity than conventional nickel-steel alloys and to improve hardness. It was possible to use a much larger diameter external wire, significantly improving rigidity, improving workability in the lead wire manufacturing, stem manufacturing, and fitting assembly processes, and drastically reducing the number of defects. However, the weldability in manufacturing lead-in wires did not deteriorate at all.

Next, we investigated the range of preferred alloy compounding ratios for the external line (42) using the base assembly as an example. The bulb used is a regular bulb with a rating of 100 V and 40 W. Even if the component ratio of the alloy is different, the wire diameter can be adjusted. Therefore, we used various external wires (42) with the same safe fusing current of 38 A, and in the stem sealing process. Once the external wire (42) is bent, and after the exhaust is finished, it is stretched and inserted into the through hole (25) of the terminal part (23) of the E26 type metal.
) and investigated the correlation between the insertion rate and alloy components. This result is shown in the graph of Figure 3. Figure 0 shows each vertex of the equilateral triangle coordinates for copper (Cu), nickel (Ni), and manganese (
Mn) is 100% by weight, and the zero mark in the coordinates indicates 100% insertion rate.

The Δ mark was 98% or more, and the X mark was less than 98%.

As is clear from this figure, if an alloy containing 63 to 70% by weight of nickel, 2 to 8% by weight of manganese, and the balance copper is used as the external wire (42), the assembly yield will improve by 2 to 3% and the desired result will be achieved. You can reach your goal. Furthermore, if the external wire is made of an alloy in this composition range, in addition to the workability when assembling the light bulb mentioned above, the workability will be greatly improved in the welding process when manufacturing the lead-in wire and the sealing process when manufacturing the stem. Yield has improved.

In addition, the lead-in wire of the present invention can be applied to various types of light bulbs as well as various high-pressure discharge lamps, etc. In short, it can be used for all types of light bulbs in which the external wire passes through a through hole in the base terminal and is electrically connected to the outside surface of the tube. I can do it.

〔Effect of the invention〕

The lead-in wire of the present invention has an external part containing 63 to 70% by weight of nickel.
, is composed of an alloy consisting of 2 to 8% by weight of manganese and the rest is copper, and has a fuse function, so it has improved resistivity and hardness, and even when configured with a large diameter, it still provides the required electrical resistance. As a result, the rigidity was significantly improved, and the workability in various processes such as lead-in wire manufacturing, stem manufacturing, and tube assembly was improved, and yields were also improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an example of a tube using an embodiment of the lead-in wire of the present invention, FIG. 2 is a front view of the lead-in wire used in the tube of this example, and FIG. 3 is a main lead-in wire. 2 is a graph showing a preferable composition range of an alloy constituting the outer port line of FIG.

Claims (1)

[Claims] Sealed wire and connect to this sealed wire, nickel is 63-70
1. An lead-in wire for a tube, characterized in that it is made of an alloy containing 2 to 8% by weight of manganese and the balance is copper, and is equipped with an outer conductor wire having a fuse function.