JPH04351222A - Bonding wire coil, and method and device for coiling bonding wire - Google Patents

Abstract

PURPOSE:To smoothen feeding of a wire and to increase length of a spool coil by making crossing angle of a bonding wire of the (n)th turn and the (n+1)th turn in each side of reciprocated coiling to be the specific angle or more. CONSTITUTION:In the bonding wire coil having multi-layer state by reciprocatively coiling the bonding wire 14 to the spool 6 from one end to the other end and further, from the other end to the one end repeating this, the crossing angle of bonding wire of the (n)th turn and the (n+1)th turn in each side of reciprocated coiling, is made to be >=0.03 deg.. In this result, it can be prevented that the (n+1)th turn's coil is inserted into the (n)th turn's coil and the feeding of wire is smoothened and the length of spool coil can be increased. By this method, this can be kept up with bonding speed and workability of the bonding work can be improved.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a bonding wire for a semiconductor device, that is, a bonding wire winding obtained by winding a wire used for connecting a chip electrode and an external lead portion of a semiconductor device onto a spool. The present invention relates to a bonding wire winding method 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, when bonding wires (hereinafter simply referred to as "wires") for semiconductor devices are wound onto spools, they are wound in a single layer in an aligned manner.

However, recently, as bonding speeds have increased, it has become necessary to increase the length of the spool winding in order to improve the workability of bonding operations. Therefore, recently, a reciprocating multilayer winding method has been used in which the wire is wound back and forth around a spool in a multilayered manner.

0004

[Problems to be Solved by the Invention] When winding a wire around a spool in multiple layers in a reciprocating manner as described above, it is difficult to wind the wire in an aligned manner, that is, in a winding manner in which the gap between adjacent wires is zero. The wire is wound at a predetermined pitch to prevent it from unraveling and cause wire breakage. However, in this case, if the n-th and (n+1)-th windings are made to be parallel or nearly parallel on the forward or return side, the (n+1)-th winding is connected between the n-th windings. This caused a defect in that the material was jammed in, resulting in poor extraction during bonding work. The present invention aims to eliminate the above defects.

[0005]

[Means for solving the problem] The invention according to claim 1 includes:
In a bonding wire winding in which a bonding wire is wound on a spool by reciprocating from one end to the other end and then from the other end to one end, and this is repeated to form a multilayer bonding wire, the nth and (n+1) reciprocating This is a bonding wire winding in which the crossing angle of the bonding wires is 0.03 degrees or more.

[0006] According to a second aspect of the invention, the intersection angle is set to 0.
2. The bonding wire winding according to claim 1, wherein the bonding wire winding has a constant value of 0.03 degrees or more.

[0007] In the third aspect of the invention, the intersection angle is set to 0.
2. The bonding wire winding according to claim 1, wherein the bonding wire winding has an undefined value of 0.3 degrees or more.

The invention as set forth in claim 4 provides a bonding wire winding method in which the bonding wire is wound on a spool by reciprocating from one end to the other end and then from the other end to the one end, and this is repeated to form a multilayer structure. , the intersection angle of the n-th and (n+1)-th bonding wires on each side of the reciprocation is 0.
．． This is a method of winding a bonding wire with an angle of 0.03 degrees or more.

[0009] According to a fifth aspect of the invention, the intersection angle is set to 0.
5. The bonding wire winding method according to claim 4, wherein the bonding wire is wound at a constant value of 0.03 degrees or more.

[0010] In the invention as set forth in claim 6, the intersection angle is set to 0.
5. The bonding wire winding method according to claim 4, wherein the bonding wire is wound at an undefined value of 0.3 degrees or more.

[0011] The invention according to claim 7 provides a spool support portion that rotatably supports the spool around the axis of the spool;
In the vicinity of the spool, a wire support part that supports the bonding wire so that it can pass therethrough, a rotation drive part that rotationally drives the spool, and at least one of the wire support part and the spool in the axial direction of the spool, A cross-feed drive section that moves the cross-feed so as to approach or separate from the other, and a control section that controls the rotational movement of the rotary drive section and the cross-feed movement of the cross-feed drive section,
In the bonding wire winding device that winds the wire by reciprocating it around the spool while controlling the rotation drive unit and the lateral feed drive unit, the control unit controls the lateral feed movement speed of the lateral feed drive unit. Adjust and reciprocate n on each side
This is a winding device for a bonding wire for a semiconductor element, in which the crossing angle between the bonding wires for the first and (n+1)th times is 0.03 degrees or more.

The invention according to claim 8 is the invention according to claim 7, wherein the control section adjusts the traverse movement speed of the traverse feed drive section so that the intersection angle is a constant value of 0.03 degrees or more. This is a bonding wire winding device.

The invention according to claim 9 is the invention according to claim 7, wherein the control section adjusts the traverse movement speed of the traverse feed drive section so that the intersection angle is an undefined value of 0.03 degrees or more. This is a bonding wire winding device.

[0014]

[Operation] In the present invention, when winding the wire onto the spool, the crossing angle between the nth and (n+1)th windings is 0.03 degrees or more on the outgoing or returning side.
1) The th winding is prevented from being sandwiched between the n th windings.

[0015]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to the accompanying drawings. First, the basic configuration of a winding device for winding wire onto a spool will be explained.

In FIG. 2, reference numeral 2 denotes a rotational drive shaft, which is connected to an output shaft of a servo motor disposed inside the winding device main body 4. As shown in FIG. At the end of this rotary drive shaft 2,
A spool 6 is attached, and the spool 6 is rotationally driven by the rotation of the servo motor.

A reciprocating drive mechanism (servo mechanism) is disposed inside the winding mounting main body 4, and the reciprocating drive mechanism includes:
The base ends of the shafts 8 are connected. Further, a roller 10 that supports the wire 14 so as to pass therethrough is rotatably attached to the tip of the shaft 8. The shaft 8 is configured to reciprocate in the axial direction of the spool 6 (in the directions of arrows a and b in FIG. 2) by the reciprocating drive mechanism.

[0018] A control unit 12 consisting of a microcomputer, disposed inside the winding device main body 4,
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 whose winding start portion is fixed to one end (flange) of the spool 6 can be moved back and forth to the spool 6 many times. It is rolled up in layers.

Next, an example of the winding form of the wire 14 by the above-mentioned winding device will be explained with reference to FIG.

After the wire 14 has its winding start portion 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.
Caught up in spool 6.

Here, the wire wound around the spool 6 when the shaft 8 is sent to one side (in the direction of arrow a in FIG. The wire wound around the spool 6 when being fed in the direction of the arrow b in FIG. 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, a chain double-dashed line 20 indicates the spool 6.
The dashed line 22 indicates the nth outgoing winding wound in
The solid line 24 represents the (n+1)th outgoing winding, and the solid line 24 represents the (n+1)th outgoing winding.

The wire winding method according to this embodiment uses pitches P1 and 1 of the first outgoing winding as the initial pitch.
After giving the pitch P2 of the returning winding, the intersection angle (ω in Fig. 1) between the nth (n is a natural number) outgoing winding and the (n+1)th outgoing winding is 0.03 degrees. A certain value (for example, 0.
1 degree), and similarly, the winding is sequentially performed so that the intersection angle between the n-th return winding and the (n+1)-th return winding becomes a constant value of 0.03 degrees or more.

[0024] In the above, keeping the intersection angle constant means that
When the winding angle of the (n+1)th winding on the forward and return sides is always increased by (a) the crossing angle from the winding angle of the nth winding, and (b) when the winding angle is always decreased by the crossing angle. And (ha)
There are cases where the increase and decrease by the intersection angle are repeated alternately, but either is acceptable.

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

Table 1 shows the results of an unwinding test when the wire was wound with varying crossing angles in each of the above settings (a), (b), and (c). Table 1 shows a spool with a diameter of 50.8 mm and a length of 1000 mm under each condition.
After winding up the wire, the spool is moved at approximately the same speed as the spool payout speed during bonding (
The wire was rotated at a circumferential speed of approximately 0.015 m/s) in a direction in which the wire would unwind, and the presence or absence of unwindability was visually determined. In addition, visual judgment is made when the wire is in a hanging state as in state X in Figure 3, which is normal, and in the state in which the unwound end of the wire is dragged in the rotational direction, as in state Y in the same figure. Each is judged as abnormal.

[0027]

[Table 1]

In Table 1, the initial pitches P1 and P2 in case (A) are the winding angle of the first outgoing winding (hereinafter referred to as
This is called the "initial outward winding angle." ) is 3.5 degrees, and the winding angle of the same backward winding (hereinafter referred to as "initial backward winding angle") is 3.5 degrees. Similarly, in case (b), the initial forward winding angle is 3.5 degrees, the initial backward winding angle is 3.5 degrees, and (
In 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 cases (a), (b), and (c) above, by setting the crossing angle to 0.03 degrees or more, the unwinding property becomes normal.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the accompanying drawings. In addition, the above-mentioned first
The same components as in the example are given the same numbers, so
The explanation will be omitted.

The winding device shown in FIG. 4 differs from the winding device shown in FIG. 2 in that a random number generator 16 is provided inside the winding device main body 4 as a random number generating means. This random number generator 16 is for providing random number data to the control unit 12, and thereby the control unit 12 can perform control using random numbers, which will be described later.

The wire winding method according to this embodiment is similar to the first embodiment in that the wire is wound in a reciprocating multi-layered manner by giving initial pitches of P1 and P2. However, in the winding method according to this embodiment, the intersection angle between the n-th outgoing winding and the (n+1)th outgoing winding is set to an undefined value of 0.03 degrees or more (however, depending on the shape of the spool, etc. ), and similarly, the nth backward winding and (n
The crossing angle of the +1) 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 "indeterminate value") is created by the control unit 12 based on random number data sent from the random number generator 16 described above.

[0033] In the above, setting the crossing angle to an indefinite value means that the winding angle of the (n+1)th winding on the forward and return sides is always set by (d) an indefinite value from the winding angle of the nth winding. There are cases in which it is increased, (e) cases in which it is constantly decreased by an undefined value, and (f) cases in which the indeterminate value is randomly increased and decreased, and any of these cases may be used.

By winding the wire as described above, (n+
1) It is possible to prevent the th winding from being sandwiched between the n-th windings, and the wire can be fed smoothly, making it possible to increase the length of the spool winding more than before.

[0035]

[Table 2]

Table 2 shows the results of an unwinding test conducted under the same conditions as in Table 1 for each of the settings (d), (e), and (f) above. In Table 2, (d)
In the case of , the initial forward winding angle is 3.5 degrees, and the initial backward winding angle is 3.
5 degrees, the initial forward winding angle in case (e) is 3.5 degrees, the initial backward winding angle is 3.5 degrees, and the initial forward winding angle in case (f) is 3.5 degrees.
5 degrees, and the initial backward winding angle is 3.5 degrees.

From Table 2, it can be seen that in the above cases (d), (e), and (f), the unwinding property becomes normal when the undefined value is set to an undefined value of 0.03 degrees or more.

In the winding device shown in FIGS. 2 and 4 described above, 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 2
It is also possible to have a configuration in which both of them are moved back and forth. Also, axis 8
The reciprocating speed of the rotary drive shaft may be kept constant, and the winding angle may be adjusted by adjusting the rotational speed of the rotary drive shaft.

[0039]

[Effects of the Invention] 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 sandwiched between the nth windings on the forward side or the backward side. This makes it possible to smoothly feed the wire and increase the length of the spool winding compared to the conventional method. Therefore, by using the spool winding according to the present invention,
This has the effect of being able to cope with higher bonding speeds and improving the workability of bonding work.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the winding form of a spool.

FIG. 2 is a plan view of a winding device according to a 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]

2 Rotation drive shaft 4 Winding device body 6 Spool 8 Axis 10 Roller 12 Control section 14 Wire 16 Random number generator

Claims (9)

[Claims] Claim 1: In a bonding wire winding in which a bonding wire is wound on a spool by reciprocating from one end to the other end and then from the other end to one end, and this is repeated to form a multilayer, the nth reciprocation on each side A bonding wire winding characterized in that the crossing angle of the (n+1)th bonding wire is 0.03 degrees or more. 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 undefined value of 0.03 degrees or more. 4. A bonding wire winding method in which a bonding wire is wound on a spool by reciprocating from one end to the other end and then from the other end to one end, and this is repeated to form a multilayer bonding wire. A method for winding a bonding wire, characterized in that the crossing angle between the bonding wires for the first and (n+1)th time is 0.03 degrees or more. 5. The bonding wire winding method according to claim 4, wherein the crossing angle is a constant value of 0.03 degrees or more. 6. The bonding wire winding method according to claim 4, wherein the crossing angle is an undefined value of 0.03 degrees or more. 7. A spool support part that rotatably supports a spool around an axis of the spool, a wire support part that supports a bonding wire so as to be able to pass therethrough in the vicinity of the spool, and a rotation drive that rotationally drives the spool. a cross-feeding drive portion that transversely moves at least one of the wire support portion and the spool in the axial direction of the spool so as to move it toward or away from the other;
A control unit that controls the rotational movement of the rotational drive unit and the lateral movement of the lateral feed drive unit, and the wire is reciprocated on the spool and wound while controlling the rotational drive unit and the lateral feed drive unit. In the bonding wire winding device, the control unit adjusts the traverse movement speed of the traverse feed drive unit, and adjusts the traverse movement speed of the traverse feed drive unit so that the
) A winding device for a bonding wire for a semiconductor device, characterized in that the crossing angle of the second bonding wire is 0.03 degrees or more. 8. The control unit sets the intersection angle to 0.03.
8. The bonding wire winding device according to claim 7, wherein the traverse movement speed of the traverse movement drive unit is adjusted to a constant value equal to or higher than 100.degree. 9. The control unit sets the intersection angle to 0.03.
8. The bonding wire winding device according to claim 7, wherein the traverse movement speed of the traverse movement drive unit is adjusted to an undefined value greater than or equal to 1.