JPS61281542A - Lead wire for diode - Google Patents

Abstract

PURPOSE:To obtain a lead wire for a diode capable of maintaining high strength by coating the outer surface of a core wire, which contains cobalt, vanadium or niobium and the remainder thereof consists of iron, with copper or a copper alloy. CONSTITUTION:With a core wire 1, it contains 30-50wt% Cobalt and not more than 5wt% vanadium or niobium, the remainder is composed of iron, and it has ferromagnetism. A copper coated layer 2 at a weight ratio of 85-95%, particularly preferably, 90-95%, is formed by coating the upper section of such an iron alloy core wire 1 with oxygen-free copper or plating it with copper, thus obtaining a lead wire having not less than 90% conductivity and allowable loss of 1W or more even on employment in phi0.6-0.7mm. Accordingly, a small-sized diode is enabled, thus realizing mounting with high density.

Description

[Detailed Description of the Invention] Industrial Application Fields The present invention relates to a lead wire for use in small diodes intended for human use, and particularly relates to a one-node wire for small diodes that is designed to improve heat dissipation. It is.

〈Conventional □Technology and its Problems〉 □Currently, the small hanging diode commercially available has two diodes, as shown in Figure A2, in order to improve heat dissipation↑↑↑↑↑3 at both ends. For example, a wire w equipped with a lead wire 3 made of zirconium copper.
It is constructed by mounting a semiconductor element 5 between A4.4 and sealing the periphery of the electrode 4.4 with a sealing glass 5. □ However, since the Zir'nium copper lead wires in this diode do not attract magnetically, the lead wires may bend during transportation during manufacturing or when being put in and taken out of storage, or the lead wires may become entangled, causing problems in the next process. There are many things.

Therefore, instead of using a zirconium copper wire as a lead wire, a soft steel wire core wire 7 as shown in the cross-sectional view in FIG.
A high copper ratio copper-coated steel wire coated with a copper layer 8 of 80% or more by weight (80 to 85% conductivity) came to be used.
It's coming.

However, with such a high copper ratio copper coated steel wire,
When the copper coverage ratio increases to 85% by weight, the hardness of the mild steel wire used as the core wire is almost lost, and its tensile strength approaches that of the copper wire. A problem has arisen in which the lead wires are bent due to the force of the wires.

Further, in order to obtain an allowable loss of 1 W using such a copper-coated steel wire, the steel wire needs to have a diameter of 0.8 mm or more.

Therefore, in order to obtain an even smaller diode by making the line 0.6~O', 7mmφ or less, the copper Φ amount ratio should be 8.
It is necessary to set the conductivity to 5 to 95% (conductivity of 85% or more).

However, when such a copper-covered steel wire with a heavy weight ratio of copper is used, (1) the weight ratio of copper coating on the mild steel core wire is 85% by weight or more,
In particular, when the content exceeds 90% by weight, the hard nature of the core wire disappears and the lead wire becomes easily bent, causing troubles such as bending due to external force or entanglement in the next process.

(2) Due to the reduced magnetic attraction, it is not possible to use a magnet to continuously flow water into the culm.

Problems such as these arise.

<Means for Solving the Problems> This invention was developed as a result of intensive investigation to solve the problems with the above-mentioned lead wires for diodes.
Even with a diameter of 0.6 to 0.7 mm, the 8'l capacity loss is 1 W or more, and a lead wire for a diode that can maintain high strength without reducing magnetic attraction force has been obtained.

That is, this invention IJ1] Pal i~30-. 50 weight%,
The outer surface of the core wire contains 85 to 95% by weight of vanadium or (51, niobium), with the balance being iron.
There is also a diode lead wire that is coated with copper or copper alloy.

<Example> Hereinafter, the structure of the lead wire for a guide wire of the present invention will be explained based on FIG. 1.

First, in Fig. 1, core wire 1 is] to pal 1 to 30 to 50
It is a core wire containing 5% by weight or less of vanadium or niobium, with the balance being iron.

By coating such an iron alloy core wire 1 with oxygen-free copper or by plating it with copper, a copper coating layer 2 having a weight ratio of 85 to 95%, particularly preferably 90 to 95% is formed.
A lead wire with a conductivity of 0% or more and an allowable loss of 1 W or more can be obtained even when used with a diameter of 0.6 to 0.7 mm.

In the iron alloy composition of the core wire 1, cobalt is set at 30 to 50% by weight because the magnetic "Pi" is the strongest, and if this content exceeds 50% by weight, the material becomes compositionally brittle. I don't like it.

In addition, the content of vanadium or niobium is 5% by weight.
The reason why the width is less than 0.5% (preferably 0.5% to 2%) is to increase workability (wire drawing), and if the width is 5% or more, this effect cannot be obtained.

A comparison of the electrical conductivity, magnetizing force, tensile strength, etc. of the lead wire of the present invention and the conventional lead wire as described above revealed that
As shown in Table 1, the lead wire of the present invention is excellent in magnetizing force and tensile strength, and when used with a diameter of 0.6 to 017 mm, it has a negative polarity of 1. ! imm width, length 2.0mm
When a diode was assembled using the Schmetzmill wire, it was found that an allowable loss of 1 W or more was obtained, which is equivalent to a diode assembled using a conventional 0.8 mm diameter lead wire.

In Table 1, the magnetizing force is the value when iron is taken as 100.

Table 1 <Effects of the Invention> As is clear from the above table, the lead wire of the present invention enables a diode that is even smaller than the conventional one, making it possible to implement high-density packaging.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the glue line of this invention, Figure 2 is l')
1-1 [A front view of a type 1 glass Tsukiichi diode, and FIG. 3 is a cross-sectional view of a conventional mild steel core wire. 1... Iron alloy core wire 2... Copper or copper alloy coating layer Applicant's agent Patent attorney Kazu 1) Showa -〇 -

Claims (1)

[Claims] A diode lead wire comprising 30 to 50% by weight of cobalt, 5% by weight or less of vanadium or niobium, and the outer surface of a core wire made of iron with the remainder coated with 85 to 95% by weight of copper or copper alloy.