JPH02249201A - Leads of electronic component, and linkage of the components with leads - Google Patents

Abstract

PURPOSE:To reinforce the strength of a linkage of leads and hence electronic components and to eliminate the bending of the linkage with a small external force by axially adhering leads to different type of metal wires harder than the leads and to be removed from conductive metal wires by cutting. CONSTITUTION:Leads 3 to be mounted on a printed board, provided at both ends of electronic components such as resistors 1, capacitors, coils, etc., are axially adhered to different type of metal wires 5 harder than the leads and to be removed from conductive metal wires 4 by cutting. For example, the resistor 1 is formed of a resistor body 2 and leads 3 attached to both ends of the body 2, the leads 3 are formed of soft copper wires 4 secured to the body 2 and electrically connected thereto and iron wires 5 adhered to the ends of the wires 4 by welding, etc., and axially extended. The resistors 1 of the above structure are sequentially fed one by one at a predetermined interval, the wires 5 of both ends are inserted between a stripelike sheet 7 of a predetermined with and a stripelike adhesive sheet 8 of about half of the width of the sheet 7, pressed to be adhered, both ends are taped, and a linkage of many resistors 1 arranged at a predetermined interval is formed.

Description

[Detailed Description of the Invention] The present invention relates to resistors, capacitors, coils, etc. that have lead wires at both ends that are taped at the ends and the taped portions are cut and removed when attached to a printed circuit board. related to electronic components.

In general, electronic components such as resistors, capacitors, and coils have lead wires made of high-conductivity mild steel at both ends, and these lead wires are inserted into the printed circuit board using an automatic insertion machine or the like. The upper wiring is joined by soldering or the like.

For electronic components that have lead wires at both ends, the electronic components are arranged at regular intervals, and both ends of the lead wires are clamped and fixed between strip-shaped mounts and strip-shaped adhesive paper of the same width, and a large number of electronic components are placed above and below these. The storage, processing, etc. are facilitated by connecting them through a strip of paper.

Before these connected electronic components are mounted on the printed circuit board, the lead wires are cut inside the clamping part to separate the electronic components into individual electronic components, and the electronic components are placed in an automatic insertion machine or the like. .

However, in the above-mentioned conventional technology, when the lead wires of electronic components are successively introduced between the upper and lower paper strips being transferred and clamped and fixed, that is, the electronic components are taped with a taping device. When connecting the lead wires in series, since each lead wire is made of a single thin annealed copper wire, it is easily bent by even the slightest external force, and it is difficult to maintain multiple lead wires in parallel at regular intervals, making it difficult for adjacent electronic components to be connected. In addition, the tip of the lead wire may be displaced from the specified position, which may interfere with the introduction.Furthermore, the lead wire may be bent, making it difficult to achieve machining accuracy, and the length of the lead wire may be shortened after cutting. There were also drawbacks such as non-uniformity.

Furthermore, due to the above-mentioned risk of bending, it is not possible to apply a strong pressing force to the upper and lower paper strips during taping, so a relatively wide clamping width is required for both the upper and lower paper, which inevitably results in a large amount of paper strips being used during taping. In addition to requiring paper, the clamping portion where the lead wire is cut and removed also becomes long, which is unfavorable in terms of production costs.

Further, since the lead wire consists of a single relatively expensive copper wire, and the portion to be cut and removed is also an expensive copper wire, this also causes an increase in production costs.

The present invention aims to overcome the above-mentioned difficulties, and is intended to solve the above-mentioned problems in electronic components such as resistors, capacitors, and coils that are equipped with lead wires at both ends to be attached to printed circuit boards. The wire and a harder dissimilar metal wire to be cut and removed are joined in the axial direction, and a large number of electronic components are sandwiched at predetermined intervals by the hard metal wire between a band-shaped mount and a narrower band-shaped adhesive paper. The electronic parts are fixedly connected to each other by taping the hard metal wires, and the highly conductive wires of the lead wires are joined to the printed circuit board.

Further, the above-mentioned continuous body of electronic components is held under pressure by the upper and lower paper strips, and the electronic components are securely fixed so that the mounting position does not move.

1 serving■ Examples will be described with reference to the drawings.

Reference numeral 1 denotes a resistor which is an example of an electronic component, and consists of a resistor body 2 and lead wires 3 attached to both ends of the resistor body 2.
The IA 3 is made up of a highly conductive mild steel wire 4 that is fixed and electrically connected to the resistor main body 2, and a hard iron wire 5 that is joined to the tip of the wire by welding, adhesive, etc. and extends in the axial direction. 6 is the above-mentioned joint portion.

The resistors 1 having the above configuration are sequentially sent one by one at regular intervals, and the iron wires at both ends are placed between the band-shaped mount 7 of a predetermined width, which is transferred from below at a constant speed, and the band-shaped adhesive paper 8, which extends from above approximately half of the width. 5 is inserted and pressure bonded. The above-mentioned taping of both ends of the resistor lead wire 3, which is inserted and crimped between the two belt-like bands 7 and 8, is performed by a conventionally known taping device. In this way, a series of a large number of resistors 1 with both ends taped and arranged at regular intervals as shown in FIG. 1 is formed.

Next, this continuous body is conveyed to a cutting machine, and the copper wire 4 and the iron wire 5 are cut.
The lead wire 3 is cut inside the joint 6, and the individual resistors 1 are sequentially separated from the connected body, and the portion of the iron wire 5 including the taped portion is removed.

The resistor 1 separated in this way is inserted into a predetermined hole 10 of the printed circuit board 9 by a lead wire 3 (copper wire 4) using a known insertion machine.
is inserted, the end portion is bent and joined to the printed wiring 11 on the printed circuit board 9 with solder 12 (see FIG. 3).

Since the present invention is constructed as described above, it produces the effects described below.

Since the lead wire is a composite wire made by joining a highly conductive metal wire and a harder dissimilar metal wire that is cut and removed, the strength of the lead wire and thus the connected body of the electronic component is reinforced by the hard metal wire. Unlike conventional lead wires, it does not bend even under small external forces. Therefore, there is no possibility that the parts may come into contact with each other during transportation due to movement of the parts.

In addition, by using such a hard metal, it is possible to apply a large pressing force, making it possible to forcibly align the lead wires, allowing for highly precise processing such as the spacing between parts during taping, the width of the paper strip, etc. Since it is possible to carry out processing and apply a large pressing force to the lead wire, the upper and lower paper strips can be held more reliably even when the width is between the paper strips compared to conventional paper strips. Even if the width of the adhesive paper is made smaller than the mount, the lead wire can be securely clamped and fixed, so the amount of adhesive paper strip used can be reduced, and costs can be reduced.

Further, since the hard metal wire, which is the portion of the lead wire that is cut and removed, can be made of a material that is significantly cheaper than the highly conductive metal wire, it is possible to significantly reduce production costs from this point of view as well.

[Brief explanation of drawings]

Fig. 1 is a partially cross-sectional plan view of electronic components according to the present invention arranged one after another via a strip of paper, Fig. 2 is a sectional view taken along the line ■-■ of Fig. 1, and Fig. 3 shows the electronic components. It is a front view mounted on a printed circuit board. 1...Resistor, 2...Resistor body, 3...Lead wire,
4...Annealed copper wire, 5...Iron wire, 6...Joint part, 7.
... Band-shaped mount, 8... Band-shaped adhesive paper, 9... Printed circuit board, 10... Hole, 11... Printed wiring, 12...
solder

Claims (2)

[Claims] (1) In a lead wire that is installed at both ends of an electronic component such as a resistor, capacitor, or coil and is attached to a printed circuit board, the axis of the lead wire connects a highly conductive metal wire and a harder dissimilar metal wire to be cut and removed. A lead wire for an electronic component characterized by having a configuration in which it is joined in a direction. (2) An electronic device having lead wires according to claim (1), wherein both ends of the lead wires of a large number of electronic components are clamped and fixed at predetermined intervals between a strip-shaped mount and a strip-shaped adhesive paper having a narrower width. A series of parts.