JP2827512B2 - Bonding wire winding, bonding wire winding method and winding device therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonding wire winding obtained by winding a bonding wire of a semiconductor element, that is, a wire used for connecting a chip electrode of the semiconductor element and an external lead portion, to a spool. The present invention relates to a winding method of a bonding wire used for manufacturing the bonding wire winding, and a winding device used for manufacturing the bonding wire winding.

[0002]

2. Description of the Related Art Conventionally, bonding wires for semiconductor devices
(Hereinafter, abbreviated as “wire”) is wound on a spool in a single-layer aligned winding.

However, recently, as the bonding speed has increased, it has become necessary to increase the length of the spool winding in order to improve the workability of the bonding operation. For this reason, recently, a reciprocating multilayer winding method has been used in which a wire is reciprocated on a spool and wound up in a multilayer.

[0004]

As described above, when the wire is wound on the spool in a reciprocating multi-layered form, the wire must be aligned and wound, that is, if the winding method is such that the gap between adjacent wires is zero. However, the wires are not easily unraveled and cause disconnection, so that the wires are wound at a predetermined pitch. However, in this case, if the n-th winding and the (n + 1) -th winding are set to be parallel or nearly parallel on the forward side or the return side, the (n + 1) -th winding is placed between the n-th winding. A defect that the material is sandwiched, and a defective drawing occurs during the bonding operation occurs. An object of the present invention is to eliminate the above defects.

[0005]

According to the first aspect of the present invention,
The bonding wire is reciprocated from one end to the other end of the spool, and from the other end to one end, so that there is no gap between adjacent windings.
Opening and winding, repeating this in a multilayer wire bonding wire, in the same direction on the forward side or the backward side
Winding the n-th and of (n + 1) th intersecting angle of the bonding wire of a bonding wire windings and 0.03 degrees.

According to a second aspect of the present invention, the intersection angle is set to a value equal to 0.1.
2. The bonding wire winding according to claim 1, wherein said bonding wire winding has a constant value of not less than 03 degrees.

According to a third aspect of the present invention, the intersection angle is set to a value equal to 0.1.
2. The bonding wire winding according to claim 1, wherein the unfixed value is 03 degrees or more.

According to a fourth aspect of the present invention, the bonding wire is reciprocated on the spool from one end to the other end and from the other end to the other end, and wound with a gap between adjacent windings.
In a method of winding a bonding wire into a multilayer structure by repeating this, the crossing angle between the n-th and (n + 1) -th bonding wires of the same direction winding on the forward side or the backward side is set to 0.03 degrees or more. It is a winding method.

According to a fifth aspect of the present invention, the crossing angle is set to be equal to 0.5.
5. The method according to claim 4, wherein the constant value is not less than 03 degrees.

According to a sixth aspect of the present invention, the crossing angle is set to be equal to 0.5.
5. The method according to claim 4, wherein the unfixed value is not less than 03 degrees.

According to a seventh aspect of the present invention, there is provided a spool supporting portion for rotatably supporting a spool around an axis of the spool,
In the vicinity of the spool, a wire supporting portion that supports the bonding wire so as to be able to pass, a rotation driving portion that rotationally drives the spool, and at least one of the wire supporting portion and the spool along the axial direction of the spool.
Traverse that moves traversing relatively to reciprocate
A drive unit (a reciprocating drive mechanism of the winding device main body 4); and a control unit that controls the rotational motion of the rotary drive unit and the lateral feed motion of the lateral drive unit. In a bonding wire winding device in which a wire is reciprocated on a spool while driving and controlling a driving unit, and a gap is wound between adjacent windings , the control unit includes a traverse feed of the traverse drive unit. adjust the movement speed, the forward
The crossing angle between the n-th and (n + 1) -th bonding wires of the same direction winding on the side or the return side is set to 0.03 degrees or more.
This is a winding device for a bonding wire .

According to a preferred embodiment of the present invention, the control section adjusts the transverse movement speed of the transverse drive section so that the crossing angle is a constant value of 0.03 degrees or more. This is a winding device for a bonding wire.

According to a ninth aspect of the present invention, the control section adjusts the traverse movement speed of the traverse drive section so that the crossing angle is an indefinite value of 0.03 degrees or more. This is a winding device for a bonding wire.

[0014]

According to the present invention, when the wire is wound on the spool,
Winding in the same direction as the forward winding or the backward winding
And the intersection angle between the n-th winding and the (n + 1) -th winding is 0.03
Degrees or more, the (n + 1) -th winding is prevented from being caught between the n-th winding in the same direction .

[0015]

【Example】

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. First, the basic configuration of a winding device that winds a wire around a spool will be described.

In FIG. 2, reference numeral 2 denotes a rotary drive shaft, which is connected to an output shaft of a servomotor disposed inside the winding device main body 4. A spool 6 is mounted on an end of the rotary drive shaft 2, and the spool 6 is driven to rotate by rotation of the servomotor.

A reciprocating drive mechanism (servo mechanism) is provided inside the winding and mounting main body 4, and a base end of a shaft 8 is connected to the reciprocating drive mechanism. A roller 10 that rotatably supports the wire 14 is attached to the tip of the shaft 8 so as to be rotatable. The shaft 8 is configured to reciprocate in the axial direction (the direction of arrow a and the direction of arrow b in FIG. 2) of the spool 6 by the reciprocating drive mechanism.

Then, a control unit 12 composed of a microcomputer, which is provided inside the winding device main body 4,
One end (flange portion) of the spool 6 is controlled by controlling the rotational movement of the spool 6 and the reciprocating movement of the shaft 8 in conjunction with each other.
The wire 14 having its winding start portion fixed to the spool 6
It is wound up in a reciprocating multilayer.

Next, an example of a winding form of the wire 14 by the winding device will be described with reference to FIG.

After the winding portion of the wire 14 is fixed to one end of the spool 6, the shaft 8 reciprocates in the axial direction of the spool 6 while the spool 6 rotates at a constant speed.
It gets caught in the spool 6.

Here, the wire wound on the spool 6 when the shaft 8 is sent to one side (the direction of arrow a in FIG. 2) is used as the forward winding, and conversely, the shaft 8 is connected to the other side ( The wire wound on the spool 6 when fed in the direction of arrow b in FIG. 2 is referred to as a return winding, and a straight line formed by the forward or return winding when viewed in a plan view, The acute angle θ (see FIG. 2) formed by the straight line in the axial direction is defined as the winding angle.

In FIG. 1, the two-dot chain line 20
, The broken line 22 indicates the nth backward winding, and the solid line 24 indicates the (n + 1) th forward winding.

In the method of winding a wire according to the present embodiment, the pitches P1 and P1 of the first forward winding are set as initial pitches.
After giving the pitch P2 of the second return winding, the intersection angle (ω in FIG. 1) between the n-th (n is a natural number) forward winding and the (n + 1) -th forward winding is 0.03 degrees. The above-mentioned constant value (for example, 0.1 degree), and similarly, the crossing angle between the n-th return side winding and the (n + 1) th return side winding is sequentially set so as to be a constant value of 0.03 degree or more. It is something to take.

In the above description, to make the intersection angle constant,
On the forward and return sides, the winding angle of the (n + 1) th winding is more than the winding angle of the nth winding, and
(B) There is a case where the angle is constantly decreased by the intersection angle, and (c) a case where the increase and the decrease of the intersection angle are alternately repeated.

By winding the wire as described above, it is possible to prevent the (n + 1) -th winding from being caught between the n-th winding on the forward side or the backward side. This makes it possible to increase the length of the spool winding more than before.

Table 1 shows the results of the unwinding test when the wire was wound while changing the crossing angle in each of the settings (a), (b) and (c). Table 1 shows the diameter 5
After winding a wire having a length of 1000 on a 0.8 spool in each condition, the spool is unwound at a speed substantially equal to the payout speed of the spool during bonding (peripheral speed: about 0.015 m / s). In this manner, the presence or absence of the unwinding property is visually determined. In addition, the determination by visual observation is normal when the wire is in a hanging state as shown in a state X in FIG. 3 and in a state where the unwound end of the wire is dragged in the rotation direction as in a state Y in FIG. Each of them is determined to be abnormal.

[0027]

[Table 1]

In Table 1, in the initial pitches P1 and P2 in the case of (a), the winding angle of the first forward winding (hereinafter referred to as "initial forward winding angle") is 3.5 degrees. The winding angle of the return winding (hereinafter referred to as “initial return winding angle”) is set to 3.5 degrees. Similarly, the initial outward winding angle in the case of (b) is 3.5.
In the case (c), the initial forward winding angle is 3.5 degrees, and the initial backward winding angle is 3.5 degrees.

From Table 1, it can be seen that in all of the cases (a), (b) and (c), the unwinding property becomes normal by setting the crossing angle to 0.03 degrees or more.

(Second Embodiment) Hereinafter, a second embodiment of the present invention will be described with reference to the accompanying drawings. Note that the same components as those in the first embodiment are given the same numbers, and a description thereof will be omitted.

The winding device shown in FIG. 4 is different from that shown in FIG. 2 in that a random number generator 16 is provided inside the winding device main body 4 as random number generating means. The random number generating device 16 is for providing random number data to the control unit 12, so that the control unit 12 can perform control using a random number described later.

The method of winding a wire according to the present embodiment is the same as that of the first embodiment in that P1 and P2 are given as initial pitches and the wire is wound in a reciprocating multilayer.
However, in the winding method according to this embodiment, the intersection angle between the n-th forward winding and the (n + 1) -th forward winding is an indefinite value of 0.03 degrees or more (however, depending on the shape of the spool, etc. Similarly, the upper limit value naturally exists.) Similarly, the intersection angle between the n-th return winding and the (n + 1) -th return winding is also set to an undefined value of 0.03 degrees or more. The indefinite value of 0.03 degrees or more (hereinafter abbreviated as “undefined value”) is generated by the control unit 12 based on the random number data sent from the random number generator 16 described above.

In the above description, making the crossing angle an indefinite value means that the winding angle of the (n + 1) th winding on the forward side and the return side is always (d) an indefinite value from the winding angle of the nth winding. There are a case where the value is increased, a case where the value is constantly reduced by (e) an undetermined value, and a case where the value of the undefined value is randomly increased and decreased.

By winding the wire as described above, as in the first embodiment, (n +
1) It is possible to prevent the n-th winding from being caught between the n-th windings, to make the wire feeding smooth, and to increase the spool winding length more than before.

[0035]

[Table 2]

Table 2 shows the results when the unwinding test was performed under the same conditions as in Table 1 in each of the settings (D), (E), and (F). In Table 2, in the case of (d), the initial forward winding angle is 3.5 degrees, the initial backward winding angle is 3.5 degrees, and (e).
In the case of (1), the initial forward winding angle is 3.5 degrees, and the initial backward winding angle is 3.
In the case of 5 degrees and (f), the initial forward winding angle is 3.5 degrees, and the initial backward winding angle is 3.5 degrees.

From Table 2, it can be seen that in all of the above cases (d), (e) and (f), setting the undefined value to 0.03 degrees or more makes the unwinding property normal.

In the above-described winding apparatus shown in FIGS. 2 and 4, the shaft 8 may be fixed and the rotary drive shaft 2 may be reciprocated in the axial direction of the spool 6, or the shaft 8 and the rotary drive shaft may be moved. 2
May be reciprocated. Also, shaft 8
And the winding angle may be adjusted by adjusting the rotational speed of the rotary drive shaft while keeping the reciprocating speed of the rotary shaft constant.

[0039]

According to the winding method or the winding device according to the present invention, it is possible to prevent the (n + 1) th winding from being caught between the nth winding on the forward side or the backward side. Thus, it is possible to increase the length of the spool winding more than before by smoothing the wire feeding. Therefore, by using the spool winding according to the present invention, it is possible to cope with an increase in the bonding speed, and there is an effect that the workability of the bonding operation can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram related to a winding configuration of a spool.

FIG. 2 is a plan view of the winding device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of an unwinding test.

FIG. 4 is a plan view of a winding device according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 2 rotation drive shaft 4 take-up device body 6 spool 8 shaft 10 roller 12 control unit 14 wire 16 random number generator

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21C 47/02 B65H 54 / 06,55 / 04 H01L 21/60

Claims (9)

(57) [Claims] 1. A bonding wire is reciprocated from one end to a multi-end and further from the other end to one end on a spool to be adjacent to the spool.
In a bonding wire winding in which a gap is provided between the windings and this is repeated to form a multilayer, the crossing angle of the nth and (n + 1) th bonding wires of the same direction winding on the forward side or the backward side is determined. A bonding wire winding characterized by being at least 0.03 degrees. 2. The bonding wire winding according to claim 1, wherein the crossing angle is a constant value of 0.03 degrees or more. 3. The bonding wire winding according to claim 1, wherein the crossing angle is an indefinite value of 0.03 degrees or more. 4. The bonding wire is reciprocated from one end to the other end and from the other end to one end of the spool, and is adjacent to the spool.
In a method of winding a bonding wire in which a gap is provided between the windings and this is repeated to form a multilayer structure, the intersection of the nth and (n + 1) th bonding wires of the same direction winding on the forward side or the backward side is performed. A method for winding a bonding wire, wherein the angle is 0.03 degrees or more. 5. The method according to claim 4, wherein the crossing angle is a constant value of 0.03 degrees or more. 6. The method according to claim 4, wherein the crossing angle is an indefinite value of 0.03 degrees or more. 7. A spool support for rotatably supporting a spool about the axis of the spool, a wire support for supporting a bonding wire near the spool so as to allow a bonding wire to pass therethrough, and a rotary drive for rotating the spool. Part, at least one of the wire support part and the spool is relatively reciprocated along the axial direction of the spool.
And a control unit for controlling the rotational movement of the rotary drive unit and the lateral feed movement of the lateral drive unit, wherein the rotary drive unit and the lateral drive unit are controlled. The wire is reciprocated on the spool while controlling the drive , and the gap between adjacent windings
In the bonding wire take-up device, the control unit adjusts the traverse movement speed of the traverse drive unit to determine the n-th time of the forward or backward same-direction winding. n
+1) Winding of a bonding wire, wherein the crossing angle of the first bonding wire is 0.03 degrees or more.
Equipment . 8. The bonding wire winding device according to claim 7, wherein the control unit adjusts the traverse movement speed of the traverse drive unit so that the crossing angle has a constant value of 0.03 degrees or more. . 9. The winding device for a bonding wire according to claim 7, wherein the control unit adjusts the traverse movement speed of the traverse drive unit so that the crossing angle is an indefinite value of 0.03 degrees or more. .