JPH03192616A - Manufacture of insulator coated bonding wire, its spool winding shape, its spool case, and packaging device for its transport - Google Patents

Abstract

PURPOSE:To prevent electrification by composing contact members with a wire base material, insulation resin material, and insulator coated bonding wire, or conductive material as far as possible, and applying a grounding process to them. CONSTITUTION:A circulation line 10 of a wire base material 2 and an insulator coated bonding wire 7 is provided to a resin coating mechanism 4, and insulation resin material 5 is applied repeatedly to be coated uniformly. In this case, contact members with the wire base material 2, insulation resin material, insulator coated bonding wire 7 including a supply spool 1, work and product takeup spools 8, 9 and formed of conductive materials as far as possible, and grounding wire 40 is connected with a guide roller 20, supply roller 30, and coater roll 42 especially. Production of static electricity is almost prevented by this, and if any static electricity is generated, it is eliminated by the grounding process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing an insulated bonding wire, a spool winding form for the wire, a spool case for the wire, and a packaging tool for transporting the wire.

More specifically, when the bonding wire used to connect semiconductor devices is an insulated bonding wire having a structure in which the wire base material is coated with an insulating resin material, antistatic measures are taken at each stage from manufacturing to transportation. Regarding.

[Prior Art] Conventionally, as a method for manufacturing an insulated bonding wire, there is known a method described in, for example, Japanese Patent Laid-Open No. 139217/1983. The insulated bonding wire manufactured by this method is made of a wire base a as shown in FIG.
It has a structure in which it is covered with an insulating resin material.

It is known from experience that when bonding is performed using an insulated bonding wire having such a structure, problems such as wire breakage and variations in loop shape occur.

Conventionally, the cause of these problems has been thought to be static electricity generated between the capillary used for bonding and the insulated bonding wire, and static electricity has been removed by grounding appropriate parts of the bonder or by spraying ions with a static-eliminating blower. The means were constructed.

[Problems to be Solved by the Invention] The static elimination means in the conventional bonder described above has a problem in that the above-mentioned problems cannot be completely eliminated.

The present invention has been made to solve these problems, and the applicant believes that the cause of this problem is static electricity charging at each stage from manufacturing to transporting the insulated bonding wire. The purpose is to provide a method for manufacturing an insulated bonding wire that can prevent static electricity, a spool winding form for the wire, a spool case for the wire, and a packaging tool for transporting the wire. be.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the method for manufacturing an insulated bonding wire according to the present invention includes coating a wire base material delivered from a supply spool with an insulating resin material to insulate it. A method for manufacturing an insulated bonding wire, which comprises forming a bonding wire and winding the insulated bonding wire onto a take-up spool, the wire base material;
The contact members of the insulating resin material and the insulated bonding wire are made of conductive materials as much as possible and are grounded, and the insulated bonding wire is actively neutralized near the take-up spool. Adopt means.

In addition, in order to achieve the above-mentioned object, the spool winding form of the insulated bonding wire according to the present invention is such that at least a portion of the spool body is wound in a spool winding form in which the insulated bonding wire is wound around a spool body having a flange. The winding end of the bonding wire is formed with an exposed conductive surface, and the wound end of the bonding wire is taped to the conductive surface of the flange with the insulating coating removed.

Moreover, in order to achieve the above-mentioned object, the spool case for insulation-covered bonding wire according to the present invention is capable of storing a spool wound with insulation-covered bonding wire therein, and the stored spool is divided into two in the axial direction. In the spool case for an insulated bonding wire which is composed of both case pieces, a means is adopted in which at least one case piece is provided with electrical conductivity.

In addition, in order to achieve the above-mentioned object, the transportation packing tool for insulation-coated bonding wire according to the present invention is a conductive sponge in which a case containing a spool wound with insulation-coated bonding wire can be embedded. Adopts a method of filling a transport box with:

[Function] According to the above-described method for manufacturing an insulated bonding wire, in the middle of manufacturing the insulated bonding wire, each of the contact members of the wire base material, the insulating resin material, and the insulated bonding wire is By using a conductive material, generation of static electricity is almost prevented, and even if static electricity occurs, it is eliminated by grounding. Furthermore, in the final stage of manufacturing the insulated bonding wire, charging of the insulated bonding wire is completely prevented by actively eliminating static electricity from the insulated bonding wire near the take-up spool.

Therefore, the object of providing a method for manufacturing an insulated bonding wire that can prevent charging is achieved.

Furthermore, according to the above-described means for winding the insulated bonding wire on the spool, the wound end of the insulated bonding wire is drawn out in a conductive manner to the conductive surface of the flange, so that conduction to the spool body is ensured. , the purpose of preventing charging of the insulated bonding wire is achieved.

Furthermore, according to the above-described means for the spool case for insulated bonding wires, since at least one of the case pieces is provided with conductivity, conductivity from the inner insulated bonding wire to the outside of the case piece is ensured, The objective of preventing charging of the insulated bonding wire is achieved.

In addition, according to the above-mentioned means for transporting and packaging the insulated bonding wire, since the case is surrounded by a conductive sponge, conduction from the internal insulated bonding wire to the outside of the case via the spool and the case is prevented. The purpose of preventing the insulated bonding wire from being charged is achieved.

[Example] Hereinafter, an example of the method for manufacturing an insulated bonding wire according to the present invention will be described with reference to FIGS. 1 to 6.

This example shows an example of an apparatus including a rewinding process.

As shown in FIGS. 1 and 2, this example apparatus has a basic structure based on a known continuous manufacturing method for insulated bonding wires.

That is, as shown in FIG. 1, a wire base material 2 sent out from a supply spool 1 is baked in a baking furnace 3 and supplied to a resin coating mechanism 4, where it is coated with an insulating resin material 5. It passes through a baking furnace 6 and is baked to form an insulated bonding wire 7, and this insulated bonding wire 7 is wound onto a work winding Lisbourg 8. Then, as shown in FIG. 2, from the work take-up spool 8, a predetermined length of the insulation-coated bonding wire 7 is again wound onto the product take-up spool 9.

As shown in detail in FIG. 3, the resin coating mechanism 4 includes a resin reservoir 41 that stores the liquid insulating resin material 5, and the insulating resin material 5 and the wire base material 2 stored in the resin reservoir 41. a coater roll 42 that contacts both of the insulating resin material 5 and adheres the insulating resin material 5 to the wire base material 2; and a resin that is provided continuously to the coater roll 42 and uniformly applies the insulating resin material 5 adhered to the wire base material 2. A uniform coating jig 43 is provided. Further, for this resin coating mechanism 4, a wire base material 2. A circulation line lO of the insulated bonding wire 7 is provided,
By repeating the application, the insulating resin material 5 is evenly coated.

Moreover, the wire base material 2. As a feeding means for the insulated bonding wire 7, a guide roller 20. Drive roller 30
is provided.

In the present invention, contact members with the wire base material 2, the insulating resin material 5, and the insulated bonding wire 7, including the supply spool 1, workpiece, and product winding Lisbourg 8, 9, are made of conductive materials (e.g., Stainless steel, carbon-containing polypropylene), especially guide rollers 20. Supply roller 30. A ground wire 40 is connected to the cork roll 42. This ground wire 40 is connected to the bearings 20' and 42 of the guide roller 20 and coater roll 42, as shown in FIG.
It is preferable to use '. Although not shown, the guide roller 20, the supply roller 30. Coater roll 4
In addition to 2, it is preferable to connect a ground wire 40 as much as possible.

Further, in the present invention, an active static elimination mechanism 50 is provided near the product take-up spool 9 to positively eliminate static electricity from the insulated bonding wire 7.

This active static elimination mechanism 50 is shown in FIG. 2 as a static elimination blower 5 [1a that sprays ions, and is configured to spray ions onto the insulated bonding wire 7 and the product take-up spool 9. Further, in FIG. 4, the insulated bonding wire 7 is brought into contact with a contact agent 50b such as gauze or sponge impregnated with water. In addition,
A metal guide 60 is provided in front of the product take-up spool 9. In addition, in FIG. 5, the contact agent 5 in FIG.
In addition to the wire 0b, a clamping contact agent 50C (such as gauze or sponge impregnated with water similar to the contact agent 50b) is provided to clamp the insulated bonding wire 7. Furthermore, in FIG. 6, metal rollers 5Q, e provided inside the metal water tank 5Qd
The insulated bonding wire 7 is made to pass through the water, and a wiping material 501° and a drying blower 5Qg are provided for the insulated bonding wire 7 that has passed through the water. It should be noted that the ground wire 40 should be connected to such active static elimination mechanism 50 as much as possible.

As a result, in the middle of manufacturing the insulated bonding wire 7, the wire base material 2. By making each contact member of the insulating resin material 5° insulation-coated bonding wire 7 as conductive as possible, generation of static electricity is almost prevented, and even if static electricity occurs, it is eliminated by the ground wire 40. Ru. Furthermore, in the final stage of manufacturing the insulated bonding wire 7, the insulated bonding wire 7 is actively neutralized near the take-up spool 9 by the active static elimination mechanism 50, and the insulated bonding wire 7 is neutralized by static elimination from the ground wire 40. The bonding wire 7 is completely prevented from being charged.

In addition to the embodiments that include the illustrated rewinding process, it is also possible to adopt an embodiment in which the insulated bonding wire 7 is directly wound onto the product winding spool 9 without using the working winding spool 8. In this embodiment, the work winding spool 8 shown in FIG.

Next, an embodiment of the insulated bonding wire spool according to the present invention will be described with reference to FIGS. 7 to 10.

In this embodiment, as shown in FIGS. 7 and 8, a spool body 9 similar to the product winding Lisbourg 9 described above has a boss 9.
1 and a flange 92, and is made of a conductive material.

The boss 91 is around which the insulated bonding wire 7 is wound, and is formed in a cylindrical shape.

The flanges 92 maintain the shape of the insulated bonding wire 7 wound around the boss 91 and are formed in a ring shape and are provided on both sides of the boss 91 to face each other. A notch 921 is provided in a part of the outer peripheral edge of this flange 92.
is provided.

The wound end 7' of the insulated bonding wire 7 wound around the boss 91 is heated with a lighter or the like to remove the insulating coating and expanded into a spherical shape as shown in FIG. 9, or as shown in FIG. As shown in FIG. 3, it is pressed and expanded flat, and is pulled out from the notch 92x to the outside of the flange 92. This winding end 7° is connected to the conductive tape 60 (
For example, copper foil tape) or insulating paper tape 60'
It is fixed by pasting. Note that if the winding end 7° is spherical as shown in FIG.
b is provided to facilitate adhesion and fixation with the conductive tape 60, and to increase the contact surface with the flange by the tape 60. In addition, in order to assist the adhesion and fixation with the conductive tape 60, a normal tape 70 is used to cover the area near the notch 922 of the lead-out portion of the insulated bonding wire 7.
It is pasted and fixed.

The structure of the winding end 7' shown in FIG. 9 has the advantage that the winding end 7' engages with the punch hole 92b and the adhesion and fixation by the conductive tape 60 becomes firm. On the other hand, the structure of the winding end 7' shown in FIG.゛ A wide contact and conduction area between the flange 92 and the flange 92 can be ensured.

According to this embodiment, since the wound end portion 7° of the insulated bonding wire 7 is drawn out to the flange 92, there is no conduction from the insulated bonding wire 7 wound around the spool body 9 to the spool body 9. In addition, since the contact conduction area between the wire base material of the winding end 7'' of the insulated bonding wire 7 and the flange 92 is secured widely, the conduction from the bonding wire 7 to the spool body 9 is good. Since static electricity is removed via the conductive external member with which the spool body 9 comes into contact, charging of the insulated bonding wire 7 is effectively prevented.

In the above-mentioned FIGS. 7 and 8, the winding end 7' indicates the terminal end of the bonding wire 7, but the starting end of the wire 7 (indicated by the reference numeral 80 in FIG. 8) is Figure 9 or 1
It is also possible to tape the wire base material a to the flange 92 in a conductive manner as shown in FIG.

In that case, as shown in FIG. 2 described above, the starting end 80. Flange 92. Static electricity can be removed from the external member (take-up shaft) via the spool body 9, or by connecting a ground wire 40 to the guide roller 20 or installing a static eliminating blower 50 near the spool main body 1, as shown in FIG. By doing so, it is possible to more effectively prevent the insulated bonding wire 7 wound around the spool body 9 from being charged.

Further, in the above embodiment, the spool body 9 is made of a conductive material (for example, made of aluminum or chrome-plated resin) and the entire surface is a conductive surface. In this case, since the insulating coating of the wire 7 is in direct contact with the conductive surface, the static electricity charged on the outer surface of the insulating coating can also be eliminated through the spool body 9.

When the spool body 9 is insulative, for example, when the surface of the aluminum spool body is anodized, the part where the winding end 7' of the bonding wire is bonded and the part where the spool body 9 contacts an external member. The surface treatment is partially removed to create a conductive surface.

Next, an embodiment of a spool case for an insulated bonding wire according to the present invention will be described with reference to FIGS. 11 to 13.

11 and 12 show a first embodiment of a spool case for an insulated bonding wire according to the present invention.

In this embodiment, a dish-shaped case piece 9 has a recess 90a projecting inward at the center and a fitting tapered surface 90b at the periphery.
0, and a resilient portion 1 having a recess 100a in the center corresponding to the recess 9Qa and fitting into the fitting tapered surface 90b at the periphery.
00b is shown.

These case pieces 90. 100 can be fitted and removed, and both case pieces 90. The recesses 90a and 100a are fitted into the spool 9 similar to the spool body 9 described above with the insulated bonding wire 7 wound thereon, so that the recesses 90a and 100a are fitted into the spool 9 so that the spool 9 can be fixedly stored. It has become. That is, when removing the spool 9, both case pieces 90. 100 is pulled out and removed in the axial direction of the spool 9.

These case pieces 90. One case piece 9 in 100
0 is uniformly formed of a conductive material (eg, carbon resin, permanently conductive ABS resin, aluminum).

Therefore, conduction is ensured from the insulated bonding wire 7 to the case piece 90 (particularly the recess 90a) through the spool 9 to the outside thereof, and charging of the insulated bonding wire 7 is effectively prevented. .

In this embodiment, it is preferable that the spool 9 is also made of a conductive material to ensure positive conduction. Further, as a modification of this embodiment, only a part of one case piece 90 or both case pieces 90. It is also contemplated that 100 may be formed in whole or in part from an electrically conductive material.

FIG. 13 shows a second embodiment of a spool case for an insulated bonding wire according to the present invention.

In this embodiment, both case pieces 90. Metal foil 110 is pasted on the entire inner surface of 100.

Also in this embodiment, conduction is ensured from the insulated bonding wire 7 to the case piece 90 through the spool 9 and further to the outside thereof, and charging of the insulated bonding wire 7 is effectively prevented.

In this embodiment as well, it is preferable to ensure active conduction by making the spool 9 also of a conductive material. Further, as a modification of this embodiment, only a part of one case piece 90 or both case pieces 90° 100 is made of metal plate +
It is also possible to attach 10.

Next, an embodiment of the transport packaging tool for insulated bonding wires according to the present invention will be described with reference to FIG. 14.

This embodiment is composed of a transport box 120 and a conductive sponge 130 filled inside the transport box 120.

The insulated bonding wire 7 is manufactured by being wound around a spool 9 similar to the spool 9 described above, and this spool 9 is housed in a case 140 for the purpose of dustproofing and the like.

Then, the case 140 containing the spool 9 wound with the insulated bonding wire 7 is embedded in the conductive sponge 130 filled inside the transport box 120, and the case 140 is inserted into the conductive sponge 130. It is surrounded by Note that in addition to this conductive sponge 130, it is also possible to use a boat fishing cushion material.

The transport box 120 is shown as a general-shaped box having a lid 120', but the shape and material may be arbitrary. Preferably, the transport box 120 is made of a conductive material.

As the conductive sponge 130, for example, there is a sponge material mixed with carbon.

According to this embodiment, since the case 140 is surrounded by the conductive sponge 130, conductivity from the internal insulated bonding wire 7 to the outside of the case 140 through the spool 9° case 140 is ensured. Therefore, charging of the insulated bonding wire 7 can be effectively prevented. Note that the spool 9. If the case 140 is also electrically conductive, the antistatic effect will be further improved. Furthermore, since the conductive sponge 130 also has cushioning properties, it is possible to omit or reduce the need for cushioning material for transportation.

[Effects of the Invention] As described above, the method for manufacturing an insulated bonding wire according to the present invention substantially prevents the generation of static electricity during the manufacturing stage of the insulated bonding wire, and even if static electricity occurs, it can be grounded. In the final stage of manufacturing the insulated bonding wire, active static elimination is performed, which has the effect of completely preventing charging of the manufactured insulated bonding wire. Also, due to this effect,
Problems such as wire breakage of the insulated bonding wire during bonding and variations in loop shape are eliminated, and an effect that can contribute to manufacturing semiconductor products with good insulation properties is produced.

Furthermore, since it is comprised of a conductive material, a ground wire connection, and an active static elimination mechanism, it has the advantage that it can be implemented without major design changes to existing insulated bonding wire manufacturing equipment.

Next, as described above, in the winding form of the bonding wire according to the present invention, since the wire base material at the winding end of the insulated bonding wire is drawn out to the flange, conduction to the spool body is ensured. This has the effect of preventing charging of the insulated bonding wire. Furthermore, this effect eliminates problems such as wire breakage of the insulated bonding wire during bonding and variations in loop shape, thereby producing an effect that can contribute to manufacturing semiconductor products with good insulation properties.

Furthermore, compared to conventional products, it does not require sophisticated machining, so it has the advantage of being cheaper to implement.

Next, as described above, the spool case for insulated bonding wires according to the present invention ensures conductivity from the internal insulated bonding wires to the outside of the case piece, thereby preventing charging of the insulated bonding wires. There is an effect that can be done. Furthermore, this effect eliminates problems such as wire breakage of the insulated bonding wire during bonding and variations in loop shape, thereby producing an effect that can contribute to manufacturing semiconductor products with good insulation properties.

Furthermore, compared to conventional products, it does not require sophisticated machining, so it has the advantage of being cheaper to implement.

Next, as described above, in the transportation packing tool for insulated bonding wire according to the present invention, since the case is surrounded by a conductive sponge, the insulated bonding wire inside is connected to the spool, and then the outside of the case via the case. This has the effect of ensuring conductivity to and preventing charging of the insulated bonding wire. Also, due to this effect,
Problems such as wire breakage of the insulated bonding wire during bonding and variations in loop shape are eliminated, and an effect that can contribute to manufacturing semiconductor products with good insulation properties is produced.

Furthermore, since the conductive sponge is lightweight, it has the effect of avoiding high transportation costs.

[Brief explanation of drawings]

FIG. 1 is a simplified diagram of a part of the apparatus for carrying out the method for manufacturing an insulated bonding wire according to the present invention, FIG. 2 is a simplified diagram of the remaining part, and FIG. 3 is a simplified diagram of the main part of FIG. Enlarged perspective view,
4 to 6 are simplified diagrams showing modifications of the main parts of FIG. 2, FIG. 7 is a front view showing an embodiment of the spool winding form of the insulated bonding wire according to the present invention, and FIG. 8 is the seventh
9 is a sectional view of the main part of FIG. 7, FIG. 10 is a sectional view showing a modification of FIG. 9, and FIG. 11 is a spool case for an insulated bonding wire according to the present invention. 12 is a partially cutaway plan view of FIG. 11; FIG. 13 is a front sectional view showing a second embodiment of the insulated bonding wire spool case according to the present invention; FIG. 14 is a partially cutaway perspective view showing an embodiment of the transport packaging tool for insulated bonding wires according to the present invention;
FIG. 15 is a cross-sectional perspective view showing the general structure of an insulated bonding wire. 1... Supply spool 2... Wire base material 4...
・Resin coating mechanism 5... Insulating resin material 7... Insulating coating bonding wire 7''... Winding end 8... Working winding spool 9... Product winding lisbourg (spool body, spool) 91... Boss 92... Flange 40
...Earth wire 50...Active static elimination mechanism 6
0... Conductive tape 60°... Paper tape 90
100... Case piece 120... Transport box 130.
...Conductive sponge 140...Case

Claims (1)

[Claims] 1. A wire base material sent out from a supply spool is coated with an insulating resin material to form an insulated bonding wire,
In this method for manufacturing an insulated bonding wire in which the insulated bonding wire is wound onto a take-up spool, the wire base material, the insulating resin material, and the contact members of the insulated bonding wire are made of conductive materials as much as possible. 1. A method for producing an insulated bonding wire, which comprises: grounding the insulated bonding wire; and actively eliminating static electricity from the insulated bonding wire in the vicinity of the take-up spool. 2. In a spool winding configuration in which an insulated bonding wire is wound around a spool body having a flange, at least a portion of the spool body is formed with an exposed conductive surface, and the insulating coating is removed from the wound end of the bonding wire. A spool winding form of an insulated bonding wire, characterized in that the end portion is taped to a conductive surface of a flange in a removed state. 3. In a spool case for insulated bonding wire that is capable of storing a spool wound with insulated bonding wire therein, and is composed of both case pieces that are divided into two in the axial direction of the stored spool, at least one case A spool case for insulated bonding wire, characterized in that one piece is conductive. 4. A packaging tool for transporting insulated bonding wire, which is made by filling a transport box with a conductive sponge into which a case containing a spool wound with insulated bonding wire can be embedded.