JP2000294597A - Winding form of bonding wire for semiconductor - Google Patents

Abstract

(57) [Summary] [Problem] It is possible to easily attach and pull out a wire end without fear of adhesion of an adhesive, and to abundantly display information such as a wire diameter, a composition, and characteristics of a wire, and to reuse the wire. The present invention provides a wire winding configuration provided with a simple wire end fastening means. A terminal jig (3) is detachably and elastically fitted to a flange (1c), and a jig (4) bridging over left and right flanges (1b, 1c) to form a flange between an end portion (2a) and a start end (2b) of a wire.
Fix to 1b, 1c. The jigs 3 and 4 can be repeatedly used because the fixing effect is little reduced. As a suitable size, fastening and pulling-out work of the wire end can be easily performed, and much information on the wound wire 2 can be displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonding wire (hereinafter simply referred to as "wire") used for assembling a semiconductor device or the like.
In some cases).

[0002]

2. Description of the Related Art Conventionally, a bonding wire used for assembling a semiconductor device or the like is disclosed in, for example, Japanese Patent Laid-Open No. 1-121818.
As disclosed in No. 2, the spool is wound around the cylindrical body of the spool, and its winding start end (becomes a terminal end when the wire is fed out) and a winding end end (becomes a start end when the wire is fed out). The tape is fixed to the inside of the body or to the flange by an adhesive tape to prevent collapse of the winding. In use, after the spool is mounted on the bonding apparatus, the adhesive tape is peeled off, the starting end is pulled out, and the spool is guided to the wire feeding path of the bonding apparatus.

[0003] The above-mentioned adhesive tape is an adhesive tape having an adhesive applied to the back surface. When the tape is used to fix the end of the wire, there is room for improvement in the following points.

[0004] That is, the used spool from which all the wires have been fed out is collected and subjected to a process of reuse after washing. However, the collected spool may have an adhesive remaining after the tape is peeled off. There is. Such a residual adhesive may be peeled off during the cleaning of the spool and reattached to the wire winding portion of the spool body, and may adhere to the wire wound around the spool. In this case, poor wire feeding or poor bonding may occur. It is also possible that it leads to. Therefore, in the process of reusing the spool, the spool is washed with an organic solvent to dissolve the residual adhesive, and the residual adhesive of the spool after the cleaning is inspected, which is a factor of high cost. Was.

[0005] Further, this kind of bonding wire is 1 mm.
Because of the following ultra-thin diameter, there is a risk that the end of the wire fixed by the tape may enter the adhesive layer of the tape. As is well known, in a bonding operation, the end of a spool mounted on a bonding apparatus may be connected to a wire detector in order to detect wire breakage and control ball formation. If the portion enters the adhesive layer, there is a possibility that conduction with the detector may not be achieved, and in this case, inconvenience occurs in disconnection detection of the wire and control of ball formation.

[0006] The above-described tape is used in a small cut because the above-mentioned problems caused by the adhesive are prevented as much as possible, and the fastening portion is a narrow portion such as a flange. In addition to the very fine work using tweezers for fixing and peeling off the end of the wire, there is a limitation in displaying information such as the wire diameter, composition, and characteristics of the wire. On the other hand, the tape cannot be reused, which leads to an increase in cost.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to eliminate the possibility that an adhesive will adhere to a wire and to stop a wire end. An object of the present invention is to provide a winding form of a bonding wire provided with a wire end fastening means capable of easily performing attachment and withdrawal operations, displaying abundant information on the wound wire, and reusable.

[0008]

In order to achieve the above-mentioned object, according to the present invention, a semiconductor bonding wire is wound around a cylindrical body of a spool, and an end of the bonding wire is attached to the cylindrical body. In the winding form of the semiconductor bonding wire fixed to the flange or the body of the spool, the means for fixing the end of the bonding wire to the flange or the body is a non-adhesive means.

The non-adhesive means referred to in the present invention means a means that does not use an adhesive as a means for fixing a wire end to a flange or a body. The means using an adhesive means a means for fixing a wire end to a flange using a tape coated with an adhesive or a means for directly fixing a wire end to a flange with an adhesive. As used herein, the term “adhesive” refers to, for example, polyvinyl acetate or polyacrylate as a synthetic adhesive, as described in the section of “adhesive” in the Chemical Dictionary (published by Kyoritsu Shuppan Co., Ltd. in 1989). And natural gums such as gum arabic.

[0010] According to the first aspect of the present invention, since the wire end is fixed to the spool by the fastening means that does not use an adhesive, the adhesive adheres to the wire and causes poor feeding, poor bonding, and conduction. This eliminates the risk of causing defects and the like, and eliminates the need for an organic solvent for dissolving the residual adhesive and a residual adhesive inspection after cleaning in the spool recycling process. In addition, the fastening means that does not use an adhesive can be reused because the fastening effect is less reduced. Further, since there is no possibility of causing a problem due to the adhesive, there is no need to make the fastening means smaller than necessary.

According to the present invention, as a mode of the non-adhesive means, a jig (claim 2) removably elastically fitted to a flange or a body of a spool, an annular member having elasticity (claim 3), Adhesive tapes (claim 4) are each adopted. Further, the non-adhesive means is formed so as to sandwich the end of the bonding wire between the flange or the body of the spool (claim 5). It is needless to say that the same operations and effects as those of the first aspect can be obtained in the configurations of the second to fifth aspects.

[0012] In another aspect of the present invention,
A jig having a shape in which the end of the bonding wire is clamped by a flange or a body can be exemplified. More specifically, a clip-shaped jig that removably and resiliently fits in the thickness direction of the spool flange, and a left and right spool Jig (see FIGS. 1 to 4) that detachably spans over the flange of
A jig (see FIGS. 5 and 7) and the like having a holding surface for holding the wire end together with the outer surface of the flange of the spool and having the holding surface detachably fitted to the inside of the body of the spool can be exemplified. .

[0013] As an embodiment of the annular member in claim 3,
An annular member shaped to cover the flange or body of the spool and clamp the bonding wire end together with the flange or body can be exemplified.More specifically, cover the flange of the spool and clamp the bonding wire end together with the flange. An annular band made of an elastic material such as rubber can be exemplified (see FIGS. 6 and 8).

Specific examples of the non-adhesive tape according to the fourth aspect include a sucker tape whose back surface is sucked and adhered to a flange, and a magnetic tape made of a magnetic material and fixed to a spool flange by magnetic force.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a spool, 2 wires, 3, 4, 5, 6, and 7 respectively denote non-adhesive means.

The spool 1 is provided with a flange at one or both ends of a cylindrical body 1a for winding the wire 2. In this example, the spool 1 is provided with flanges 1b and 1c at both ends of the body 1a.

The wire 2 is a very small diameter bonding wire made of, for example, Au, Ag, Al, Cu, or an alloy thereof used for assembling a semiconductor device. Wire 2
Is the winding start end (it becomes the end when the wire is fed out) 2
a and the end of the winding (becomes the starting end when the wire is fed)
2b and the flanges 1b,
1c.

In the non-adhesive means shown in FIGS. 1 to 4, 3 is a clip-shaped jig, 4 is a bridging jig, and these jigs 3, 4 are made of synthetic resin or the like so as to have desired elasticity. Form.

The clip-shaped jig 3 is formed in a clip shape having a U-shaped cross section so that it can be detachably and elastically fitted in the thickness direction of the flanges 1a and 1b of the spool 1, and has a wire end portion 2a and a wire end portion 2b. It is sandwiched between the flanges 1a and 1b.

The bridging jig 4 is formed so as to be detachably bridging over the left and right flanges 1a and 1b of the spool 1, and has bent surface portions 4a and 4b provided at both ends thereof and the flanges 1a and 1b. And the outer surface of the wire can clamp the end 2a and the start 2b of the wire.

The use of these jigs 3 and 4 is as follows.
As shown in FIG. 1, the end 2a of the wire is fixed to the flange 1c with the clip-shaped jig 3, and the start end 2b is fixed to the flange 1b with the bridging jig 4, as shown in FIG. In addition, a mode in which both the end portion 2a and the start end portion 2b are fixed to the flanges 1b and 1c with the clip-shaped jigs 3 and 3 can be exemplified.

The non-adhesive means shown in FIG. 5 and FIG.
a, an annular jig 5 having a pressing surface 5a for holding the start end 2b, and this annular jig 5 is also formed of synthetic resin or the like so as to have desired elasticity. The annular jig 5 is formed by integrally forming the pressing surface 5a on one peripheral edge of a cylindrical portion 5b removably fitted inside the spool body 1a.
b is fitted into the inside of the spool body 1a, so that the pressing surface 5a and the outer surfaces of the flanges 1a and 1b are connected to the end 2 of the wire.
a, the starting end 2b is clamped.

The non-adhesive means shown in FIGS. 6 and 8 is an annular member 6 having elasticity and covering the flange of the spool and holding the bonding wire end together with the flange. The annular member 6 is an annular band made of an elastic material such as rubber.

The non-adhesive means shown in FIGS. 9 and 10 is a non-adhesive tape 7, which is made of a sucker tape or a magnetic material, the back surface of which is sucked and which is detachably attached to the flanges 1b and 1c. And a magnetic tape fixed to the flanges 1b and 1c by a magnetic force. When a magnetic tape is used, it is needless to say that the spool 1 is made of a magnetic material such as iron and is integrally molded with rust-preventive plating (for example, Ni plating).

The non-adhesive means 3, 4,
According to the winding configuration using 5, 6, and 7, the end 2a and the start 2b of the wire can be connected to the flange 1 without using an adhesive.
b, 1c. Further, each of the non-adhesive means 3, 4, 5, 6, and 7 can be reused with a small reduction in the fastening effect. Further, each of the non-adhesive means 3, 4, 5,
6 and 7 can be formed and used appropriately without the need to make them unnecessarily small, so that the work of fixing the wire end portion 2a and the start end portion 2b and removing the wire at the time of pulling out can be performed without using tweezers or the like. This can be easily performed, and a lot of information on the wound wire can be displayed. The clip-shaped jig 3, the bridging jig 4, and the annular jig 5 are particularly excellent in terms of the easiness of the fixing work and the removing work, and the bridging jig 4, the annular jig 5 are particularly good for displaying information. Especially excellent.

Each of the non-adhesive means 3, 4, 5, 6,
The use form of 7 is not limited to the illustrated form, and the respective non-adhesive means 3, 4, 5, 6, and 7 can be used in an appropriate combination.

For convenience of illustration, the wire 2 is shown to be larger in diameter than the actual one and wound in two layers around the spool 1. However, the wire 2 is a thin wire having a diameter of 1 mm or less, and Needless to say, it will be wrapped around.

[0028]

The winding configuration of the present invention is constructed as described above, and has the following effects. This eliminates the possibility that the adhesive adheres to the wire to cause poor feeding, poor bonding, poor conduction, and the like. Further, in the spool reusing process, cleaning using an organic solvent and inspection work of the residual adhesive become unnecessary. Further, since the reduction of the fastening effect is small, it can be reused, and cost reduction and effective use of resources can be achieved. Since it is not necessary to make the fastening means (non-adhesive means) unnecessarily small, fastening and pulling-out work of the wire end can be easily performed, and a large amount of information on the wound wire can be displayed. Numerous effects are achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a winding mode according to the present invention.

FIG. 2 is a perspective view showing an example of an embodiment of a winding mode according to the present invention.

FIG. 3 is a longitudinal sectional view of the winding configuration shown in FIG.

FIG. 4 is a sectional view taken along line (X)-(X) of the winding configuration shown in FIG.

FIG. 5 is a perspective view showing an example of an embodiment of a winding mode according to the present invention.

FIG. 6 is a perspective view showing an example of an embodiment of a winding mode according to the present invention.

FIG. 7 is a longitudinal sectional view of the winding configuration shown in FIG.

FIG. 8 is a vertical sectional view of the winding configuration shown in FIG.

FIG. 9 is a partial cross-sectional front view showing an example of an embodiment of a winding form according to the present invention.

FIG. 10 is a perspective view of the winding configuration shown in FIG. 9;

[Explanation of symbols]

 1: Spool 1a: Body 1b, 1c: Flange 2: Wire (bonding wire) 2a: Beginning end of wire (end at the time of wire feeding) 2b: End of winding of wire (start at the time of wire feeding) 3: clip-shaped jig (non-adhesive means) 4: bridging jig (non-adhesive means) 5: annular jig (non-adhesive means) 6: annular member (non-adhesive means) 7: non-adhesive means (non-adhesive means) means)

Claims (5)

[Claims] In a winding form of a semiconductor bonding wire, a semiconductor bonding wire is wound around a cylindrical body of a spool, and an end of the bonding wire is fixed to a flange or a body of the spool. The winding form of the semiconductor bonding wire, wherein the means for fixing the end to the flange or the body is a non-adhesive means. 2. The winding form of a semiconductor bonding wire according to claim 1, wherein said non-adhesive means is a jig which is removably and elastically fitted to a flange or a body of a spool. 3. The winding form of a bonding wire for a semiconductor according to claim 1, wherein said non-adhesive means is an annular member having elasticity. 4. The winding form of a semiconductor bonding wire according to claim 1, wherein said non-adhesive means is a non-adhesive tape. 5. The winding of a bonding wire for a semiconductor according to claim 1, wherein the non-adhesive means holds an end of the bonding wire with a flange or a body of the spool. Form.