JP2005289587A - Thin wire winding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To re-wind a thin wire well by preventing a spool from being shifted from a spool holder even inertia force at the time of turning gets larger along with increase of a winding speed and a winding amount of the thin wire. <P>SOLUTION: The spool holder 18 is equipped with spool holding means 20 for pressing and locking an outer end of the spool in the axial direction when it is mounted with the spool. A plurality of the spool holding means 20 are provided on the outer peripheral surface of the spool holder 18. The spool holding means 20 comprises a projecting member 21 provided in a protruding/ receding manner in a hole 24 provided on the outer peripheral surface of the spool holder 18 and an energizing member 22 for energizing the projection member 21 to protrude out of the hole 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a thin wire winding device, and more particularly, to a thin wire winding technique suitable for use as a bonding wire used for connecting a semiconductor product or the like.

  Bonding wires are used for the connection of semiconductor products, for example, large-scale integrated circuits such as LSIs. In recent years, thin wires used as such bonding wires tend to be thinner, and if the tension is unstable when connecting semiconductor products, poor connection is likely to occur. In order to avoid this, it is manufactured by a thin wire winding device that winds while reducing the tension (see, for example, Patent Document 1).

  As shown in FIG. 9, the conventional thin wire winding device is provided with a spool 3 as a winding body on the outer periphery of the spool holder 2 when winding the thin wire. A plurality of pin-shaped plungers 4 urged outward are provided by nuts 5 on the outer periphery of the spool holder 2. The plunger 4 is provided with a synthetic resin at a contact portion with the spool 3 in order to prevent the spool 3 made of light metal from being scratched. When the spool 3 is mounted on the spool holder 2, the spool 3 is pressed against the spool holder 2 by urging the spool 3 from the inner diameter side to the outer diameter direction by the urging force of the plunger 4. .

  In this thin wire winding device, a long thin wire manufactured by a wire drawing process and an annealing process is wound around a bobbin (as a feeding body) in advance, and the spool holder 2 is rotated around an axis by a drive source (not shown). As a result, the thin wire fed out from the bobbin is wound around the spool 3 with a desired low tension and a desired length.

At this time, for example, when a material that does not oxidize, such as a gold wire, is used as the thin wire, if the thin wires overlap each other, the spool holder 2 may be attached to each other due to metal bonding. By reciprocating (traverse motion) in the axial direction while rotating, the thin wire axes are wound so as to cross each other. As a result, as shown in FIG. The traverse type is adopted in which the already wound thin wire 1 and the thin wire 1 wound from now on are wound so as to intersect each other.
When the thin wire 1 having a desired length is wound on the spool 3, the spool 3 is removed from the spool holder 2 and then shipped to a semiconductor manufacturer or the like. In the thin wire winding device, the thin wire 1 is completely wound. Each time, a new empty spool 3 is repeatedly mounted on the spool holder 2.
JP 2003-205989 A (page 3-5, FIGS. 1 to 3)

By the way, in the conventional thin wire winding device, while the rotational speed of the spool holder 2 is increased to increase the winding speed and the traverse motion is also increased accordingly, the inertial force at the time of the turn becomes large. In addition, since the weight increases with an increase in the winding amount, the inertial force is further increased.
Therefore, despite the fact that the spool 3 is mounted on the spool holder 2 by the urging force of the plunger 4, the spool 3 can be satisfactorily secured only by the frictional resistance between the tip of the plunger 4 and the inner surface of the spool 3 during winding. There was a problem that the spool 3 could not be supported, and the spool 3 was displaced from the spool holder 2 in the axial direction, and the thin wire 1 could not be properly wound in a desired form.

  The present invention has been made in consideration of such circumstances, and even if the inertial force at the time of turning increases as the winding speed of the fine wire and the winding amount increase, the spool is not displaced from the spool holder. An object of the present invention is to provide a fine wire winding device that can prevent and finely rewind a thin wire.

In order to achieve the above object, the present invention proposes the following means.
The invention according to claim 1 is provided with a spool holder that mounts a spool on the outer peripheral side and supports the spool by a support portion, and reciprocally moves the spool holder in the axial direction while rotating around the axis. In the traverse type thin wire winding device for winding a conductive thin wire around the outer circumference of the spool, the spool holder is provided with holding means for pressing and holding the tip of the spool in the axial direction when the spool is mounted. Features.
As a result, when the spool is mounted on the spool holder, the holding means can hold the spool by pressing and locking the tip of the spool in the axial direction. For example, as the winding speed of the thin wire and the winding weight increase Thus, even if the inertia force of the turn operation is increased, it is possible to reliably prevent the spool from being displaced in the axial direction from the spool holder.
According to a second aspect of the present invention, in the thin wire winding device according to the first aspect, the holding means is attached to the outer peripheral portion of the spool holder so as to be able to protrude and retract outward, and to the protruding member. A biasing member for applying a force, and a tip end portion of the projecting member in a direction orthogonal to the axial direction is positioned axially outward from the tip end portion in the axial direction of the spool mounted on the spool holder. The spool is pressed toward the support portion.
Accordingly, when the urging member is applied with the urging force by the urging member, the portion of the projecting member on the spool side from the end portion in the direction orthogonal to the axial direction presses the spool toward the support portion side. Is pressed toward the support portion of the spool holder and fixed at the support portion.
According to a third aspect of the present invention, in the thin wire winding device according to the second aspect, a plurality of the holding means in which the tip end portion of the projecting member is formed in a spherical shape are provided along the axial direction. Any one of the projecting members presses the spool toward the support portion.
As a result, since the tip of the projecting member is formed in a spherical shape, when the end of the spool is pressed against the projecting member from the outside in the axial direction, the projecting member is displaced into the spool holder, so that the spool can be easily Mounted on the spool holder.
In addition, since the spool holder is provided with a plurality of holding means in the axial direction, even when spools of various sizes are mounted on the spool holder, the spool end surface may be provided in a plurality of axial directions. Among the spherical projecting members of the holding means, the spool holder is pressed to the support portion side by the portion on the spool side from the tip portion in the direction orthogonal to the axial direction.

  According to the present invention, even if the inertia force at the time of turning increases with an increase in the winding speed and the winding amount of the fine wire, the spool is prevented from being displaced from the spool holder, and the fine wire is rewinded satisfactorily. Can do.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing a thin wire winding device according to a first embodiment of the present invention. FIG. 1 is a front view showing the thin wire winding device, and FIG. 2 shows the thin wire winding device. 1 is a side view showing a spool holder, FIG. 4 is an enlarged cross-sectional view showing spool holding means provided in the spool holder, and FIG. 5 is a diagram showing spool holding means provided on the outer peripheral surface of the spool. It is explanatory drawing which shows the attachment position.
1 and 2, a thin wire winding device 10 of this embodiment is applied to a thin wire as a bonding wire used for wiring of a semiconductor product, and is a bobbin as a feed body around which the thin wire 11 is wound. 12 and a dancer 14 and a plurality of sheaves 15a to 15c as guide rollers are provided on a winding path between the winding 12 and a spool 13 as a winding body that winds up the thin wire 11 drawn out from the bobbin 12. Yes.

  The thin wire 11 wound around the bobbin 12 is made of, for example, a gold wire, and is manufactured through a wire drawing step and an annealing step, which are the previous steps. The bobbin 12 is attached to the output shaft of the feeding motor 16 and is rotated by driving the motor 16 so that the thin wire 11 is fed.

  The dancer 14 performs a so-called tension detection function, and includes an arm 14b that is swingably supported around a fulcrum 14a, and a roller 14c that is rotatably supported at the tip of the arm 14b. The thin wire 11 drawn out on the roller 14c is guided on the roller 14c. The dancer 14 swings according to a change in the feed amount (feed amount per unit time) of the thin wire 11 fed from the bobbin 12.

The dancer 14 is provided with an angle detector (not shown), and when the angle when the dancer 14 swings according to the fluctuation of the tension of the thin wire 11 is detected, the bobbin 12 (feeding motor 16 is based on the angle. ) Is controlled, the feed amount of the thin wire 11 fed from the bobbin 12 is adjusted.
The sheaves 15a to 15c are rotatably supported on the winding path between the bobbin 12 and the spool 13, respectively.

  As shown in FIG. 2, the spool 13 is mounted on the outer periphery of the spool holder 18 attached to the output shaft of the motor 17 as a drive source, and winds the fine wire 11 fed out from the bobbin 12. At that time, the spool holder 18 is rotated by driving of the motor 17 and is reciprocated in the axial direction by a traverse means (not shown) so that the thin wires are wound around the spool 13 so as not to adhere to each other in the linear axis direction. Thus, the thin wire 11 from the bobbin 12 can be wound around the spool 13 with a predetermined tension and a desired length.

In this embodiment, the spool holder 18 is provided with a spool holding means 20 that presses and locks the outer end of the spool 13 in the axial direction when the spool 13 is mounted.
As shown in FIG. 3, a plurality of spool holding means 20 are provided on the outer peripheral surface of the spool holder 18. That is, as shown in FIG. 4, the spool holding means 20 includes a protruding member 21 provided so as to be freely retractable in a hole 24 provided on the outer peripheral surface of the spool holder 18, and the protruding member 21 outside the hole 24. And an urging member 22 for urging so as to protrude in the direction. The projecting member 21 is made of a sphere formed of a synthetic resin, and is made of a material having a small frictional resistance such as polyacetal. The urging member 22 is provided inside the spool holder 18, and a tip thereof is a compression coil spring that urges the projecting member 21 in the outer diameter direction of the spool holder 18 with its spring force.

  As shown in FIG. 5, three such spool holding means 20 are provided on the same circumference of the outer peripheral surface of the spool holder at an angle of 120 degrees centered on the central portion O, and these three As shown in FIG. 3, the sets are provided on the outer peripheral surfaces of the tip end side in the axial direction, the substantially central portion, and the base side in the spool holder 18.

  In the spool holding means 20, when the spool 13 is mounted on the spool holder 18, the protruding member 21 on the axially leading end side (or the central side) causes the leading end portion of the spool 13 to axially move by the biasing force of the biasing member 22. The spool 13 is prevented from being displaced from the spool holder 18 toward the front end in the axial direction by being pressed and locked.

The spool holder 18 provided with the spool holding means 20 has a cylindrical shape. As shown in FIG. 3, the spool 13 is provided on the base 18a to which the spool 13 is attached and the base of the main body 18a. And a flange (supporting portion) 18b having a large diameter that comes into contact with the base plate. A tapered surface 18c is provided on the outer peripheral surface of the main body 18a so as to facilitate insertion into the spool 13 at the tip, and the diameters of the first to third stepped portions 18d to 18d are reduced in the direction from the flange 18b. 18f are provided at three positions at intervals, and spool holding means 20a, 20b, and 20c are provided on the circumferences of the respective step portions 18d to 18f.
Each of the spool holding means 20a provided in the first step portion 18d and the spool holding means 20c provided in the third step portion 18f are respectively connected to the outer periphery of the spool holder 18, as shown in FIGS. In the surface, they are arranged on the same circumference corresponding to each other in the circumferential direction.
On the other hand, each of the spool holding means 20b provided in the second stepped portion 18e located between the first stepped portion 18d and the third stepped portion 18f is different from the spool holding means 20a and 20c. It is arranged at a position rotated in the circumferential direction by approximately 60 degrees.

Since the thin wire winding device 10 is configured as described above, its operation will be described below.
As shown in FIGS. 1 and 2, a spool holder 18 is attached to the output shaft of the motor 17, and the spool 13 is mounted on the spool holder 18, while the thin wire 11 wound around the bobbin 12 is attached. It is assumed that the tip is hooked on the spool 13 through the sheave 15a, the dancer 14, and the sheaves 15b and 15c.

In this state, the bobbin 12 is rotated in the feeding direction by driving the feeding motor 16 to feed the thin wire 11, and the spool holder 18 is rotated in the winding direction by driving the motor 17, and the spool holder 18 is traversed. When the operation is applied, the spool 13 reciprocates in the axial direction while rotating, so that the thin wire 11 is wound around the spool 13 from the bobbin 12 with a desired tension and a desired length.
At the time of rewinding the thin wire 11, if the inertial force at the time of turning is increased with an increase in the winding speed and the winding amount of the thin wire, the spool 13 may be displaced from the spool holder 18 due to the influence of the inertial force.

However, since the spool holder 18 is provided with a plurality of spool holding means 20, the following operations shown in FIGS. 6 and 7 can be obtained. 6 is an explanatory view of a half section showing a state where the spool is mounted on the spool holder, and FIG. 7 is an enlarged explanatory view showing the action of the protruding member of the spool holding means. In these drawings, for convenience of explanation, Of the protruding members 21 of each spool holding means 20, those provided on the first step portion 18d of the spool holder 18 are "protruding members 21a" and those provided on the second step portion 18e are "protruding members 21b". “, The one provided in the third step portion 18 f is referred to as a“ projecting member 21 c ”.
That is, when the spool 13 is mounted on the spool holder 18, as shown in FIG. 6, in the spool holder 18, the protruding member 21c on the third stepped portion 18f and the protruding member 21b on the second stepped portion 18e Contacts the inner peripheral portion of the spool 13 and presses the spool 13 in the radial direction from the inner periphery to hold the spool 13.

  On the other hand, in the spool holding means 20 on the first step portion 18d, when the spool 13 is inserted into the spool holder 18, the protruding member 21a resists the urging force of the urging member 22 and temporarily squeezes into the spool holder. When the spool 13 moves to a position where it abuts against the flange 18c as shown in FIG. 6, when the tip of the spool 13 passes through the protruding member 21a, the protruding member 21a is released from the spool 13 and the biasing member 22 Since the urging force F functions effectively, the protruding member 21a protrudes further upward than the protruding members 21b and 21c, and contacts the tip of the spool 13 in this state.

In other words, as shown in FIG. 7, the protruding member 21 a is applied with an urging force F by the urging member 22, so that the protruding member 21 a is pushed against the spool 13 in a direction inclined with respect to the axial direction. Pressure F2 is applied.
The pressing force F2 is divided into an axial thrust force F1 and a radial force F3 in a direction orthogonal to the axial direction, so that the spool 13 is pressed against the flange portion 18b of the spool holder 18 by the thrust force F1. Fixed.
Since the protruding members 21a are provided at equal intervals along the circumferential direction of the spool holder 18, the radial forces F3 acting on the spool 13 are canceled out.

  Therefore, according to this embodiment, when the spool 13 is mounted on the spool holder 18 by the holding means 20 provided on the spool holder 18, the protruding member 21a of the holding means 20 presses the tip of the spool 13 in the axial direction. Since the spool 13 can be held by being locked, the spool 13 can be held by the spool holder 18 even if the inertial force of the turn operation increases as the winding speed or winding weight of the thin wire 11 increases. Can be surely prevented from shifting in the axial direction, so that the fine wire can be satisfactorily wound.

Further, the holding means 20 includes projecting members 21a to 21c and an urging member 22, so that the holding means 20 can be easily configured and can reliably prevent the spool 13 from shifting in the axial direction. .
Further, since the projecting member 21 is a sphere, when the spool 13 is mounted on the spool holder 18, the projecting member 21 rotates in contact with the spool 13 along with the mounting operation, and the spool 13 is removed. Although the rotation also occurs when the new spool 13 is attached / detached, there is no risk that the projecting member 21 may be scratched by the spool 13 even if contact is made at that time. Abrasion can be suppressed, and the life of the spool holding means 20 can be extended. In addition, since the projecting member 21 that forms a sphere is made of polyacetal or the like having a low frictional resistance, the projecting member 21 can be easily attached to and detached from the spool holder 18, and the life of the projecting member 21 can be extended. You can also.

  Furthermore, the holding means 20 not only holds the tip of the spool 13 but also other holding means 20 arranged at different positions, that is, each of the projecting members 21b and 21c, pulls the spool 13 from the inner peripheral portion. Since it is pressing outward along the radial direction, the spool 13 can be held more accurately. Therefore, the spool 13 can be more firmly held by the cooperation of the plurality of holding means 20, and the holding reliability with respect to the spool can be improved.

The plurality of holding means 20 are provided at three locations along the axial direction of the spool holder 18, the first step portion, the second step portion, and the third step portion. Even if various different spools 13 are mounted, the holding means 20 provided at any stepped portion can press the tip of the spool 13 and fix it to the spool holder 18.
That is, in the spool, in order to match the winding length of the fine wire 11 and the attachment mechanism to the wire bonding apparatus, there are long and short ones in the axial direction. The spool holder 18 can be mounted.
Accordingly, among the plurality of holding means 20, for example, the holding means 20 (projecting member 21a) on the first stepped portion 18d side is provided corresponding to the long spool 13, and the holding means 20 (on the second stepped portion 18e side) ( When the protruding member 21b) is arranged corresponding to the size of the short spool, even when the spool 13 has a different length in the axial direction, when any one of the spools 13 is mounted on the spool holder 18, The spool 13 can be pressed and locked in the axial direction. As a result, the spool 13 can be reliably held regardless of the type of the spool 13. Therefore, the projecting member 21a and the projecting member 21b are arranged in advance according to the length of each spool.

In addition, each of the projecting members 21a to 21c is not only provided on the outer peripheral surface of the spool holder 18 by three at regular intervals, but the projecting members 21a and 21c and the projecting member 21b are 60 ° from each other. Since each of the projecting members 21b is arranged at an intermediate position between the projecting members 21a and between the projecting members 21c, the angle of the spool 13 is substantially equal over the spool holder 18 in the axial direction and the circumferential direction. Thus, the winding of the thin wire 11 around the spool 13 becomes even better.
Further, since the projecting members 21a to 21c are arranged so as to be shifted from each other by 60 ° with respect to the circumferential direction of the spool holder 18, the pressing force exerted on the spool 13 by the projecting members 21a to 21c from the radial direction is dispersed. The spool 13 is difficult to deform in the radial direction.

FIG. 8 shows a main part of a thin wire winding device according to the second embodiment of the present invention.
In this embodiment, the difference from the first embodiment is that the holding means 20 is provided with a projecting member 21 and a biasing member 22 and a receiving plate 25 that rotatably supports the projecting member 21. It is in.
That is, the receiving plate 25 is interposed between the protruding member 21 and the urging member 22. A spherical groove 26 corresponding to the protruding member 21 is provided on the upper surface of the receiving plate 25, and the protruding member 21 is supported by bringing the protruding member 21 into contact with the groove 26.
In this case, the backing plate 25 is preferably made of polyacetal or the like having a low frictional resistance.

  According to this embodiment, since the receiving plate 25 is interposed between the projecting member 21 and the urging member 22, it is possible to further suppress the projecting member 21 from being worn by contact with the urging member 22, The life of the protruding member 21 can be further extended.

  In addition, in the said embodiment, each component of the thin wire | winding winding apparatus 10 is not limited to the example of illustration, In short, what is necessary is just to obtain the expected function. Moreover, although the example which used the gold wire as the thin wire was shown, it is needless to say that the present invention can be applied to other materials such as copper (Cu), aluminum (Al) and the like.

It is a schematic front view which shows the fine wire winding apparatus which concerns on 1st Embodiment of this invention. It is a side view of FIG. 1 which similarly shows a thin wire winding device. It is a side view which shows a spool holder. It is an expanded sectional view which shows the spool holding means with which the spool holder was equipped. It is explanatory drawing which shows each attachment position of the spool holding means provided in the outer peripheral surface of the spool. It is a half section explanatory view showing the state where the spool was installed in the spool holder. It is an enlarged explanatory view showing the action of the protruding member of the spool holding means. The principal part of the thin wire winding apparatus which concerns on 2nd Embodiment of this invention is shown. It is explanatory drawing which shows the spool holder and spool which were provided in the conventional fine wire winding apparatus. It is an expanded explanatory view which shows the winding state of the thin wire rewinded by the spool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Thin wire winding device 11 Fine wire 13 Spool 18 Spool holder 20 Spool holding means 21, 21a-21c Protrusion member 22 Energizing member

Claims (3)

A spool holder is mounted on the outer peripheral side and supports the spool by a support portion. The spool holder is reciprocated in the axial direction while rotating around the axis, and a conductive thin wire is formed on the outer periphery of the spool. In the winding traverse type thin wire winding device,
When the spool is mounted on the spool holder, the fine wire winding device is provided with holding means that presses and holds the tip of the spool in the axial direction. In the thin wire winding device according to claim 1,
The holding means includes a protruding member that is provided on the outer periphery of the spool holder so as to be able to protrude and retract outward, and a biasing member that applies a biasing force to the protruding member. The thin wire winding is characterized in that a tip end portion of the projecting member is positioned axially outward from a tip end portion in the axial direction of the spool mounted on the spool holder, and presses the spool toward the support portion side. Taking device. In the thin wire winding device according to claim 2,
A plurality of the holding means in which the tip end portion of the protruding member is formed in a spherical shape are provided along the axial direction, and any one of the protruding members presses the spool toward the support portion. A fine wire winding device.

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