Feedthrough device, wire bonder, and method of using the same

Abstract

The present application relates to the technical fields of semiconductor packaging, and discloses a threading device, a wire bonding instrument and a method for using the same. The threading device comprises a cylinder frame, the cylinder frame comprises a channel for communicating with the inside of a cleaver, and the channel is connected with an air flow generator for forming a traction air flow in the inside of the cleaver. The flow direction of the traction air flow is from the cleaver to the channel. The cylinder frame is combined with the air flow generator to form the traction air flow flowing from the cleaver to the channel in the inside of the cleaver. Thus, the wire located at the entrance of the inside of the cleaver or the broken wire in the inside of the cleaver is moved to the mouth of the cleaver under the action of the traction air flow, and the threading or the removal of the broken wire from the cleaver is completed. The device has a simple structure, effectively reduces the difficulty of threading operation, improves the threading efficiency, has a good blocking effect, and can completely guide the broken wire in the inside of the cleaver out, so as to ensure that the broken wire is not left.

Description

Technical Field

[0001] This invention relates to the field of semiconductor packaging technology, and in particular to a wire bonding device, a wire bonding instrument, and a method of using the same. Background Technology

[0002] In semiconductor packaging, the connection between the chip and the lead frame (or substrate) provides the circuit connection for the distribution of power and signals. Wire bonding is the process of connecting the corresponding part of the chip to the lead frame (or substrate) with very fine metal wires (hereinafter referred to as "leads"). This process is also called pressure bonding.

[0003] Because the lead wire is relatively thin and soft, it is prone to breakage during wire bonding. In existing technology, after a lead wire breaks, the operator must manually pass the wire through the wedge and expose it through the wedge's nozzle to complete the lead wire threading operation before continuing with the pressure bonding process. In actual operation, completing one threading operation requires the following four steps: 1) clamping the lead wire; 2) straightening the end of the lead wire to form a sufficiently long straight segment; 3) aligning the end of the lead wire with the center of the wedge's interior.

[0004] 4) Pass the end of the lead wire through the inside of the chopper and expose it through the mouth of the chopper. However, on the one hand, because the lead wire material itself is relatively soft, it is difficult to form a straight segment long enough for threading. On the other hand, the diameter of the lead wire is small, usually tens of micrometers, making it difficult to control precisely. In addition, the aperture inside the chopper is also small, making the threading operation difficult to perform smoothly. The threading is difficult and inefficient.

[0005] In addition, the lead wire may break inside the splitter. Because the diameter of the hole inside the splitter is too small, directly using conventional tools such as a rubber bulb or air gun to blow out the lead wire will result in poor unblocking effect and may leave behind lead wire fragments, which will shorten the service life of the splitter. Summary of the Invention

[0006] The purpose of this invention is to address the existing technological situation by providing a wire threading device, a wire bonding instrument, and a method for using them. The wire threading device of this invention has a simple structure, making wire threading and unblocking easier and more efficient.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] On one hand, the present invention provides a threading device, including a cylindrical frame, the cylindrical frame including a channel for communicating with the interior of a chopping blade, the channel being connected to an airflow generator for forming a traction airflow inside the chopping blade, the traction airflow flowing in the direction from the chopping blade to the channel.

[0009] Preferably, the airflow generator is an air intake unit.

[0010] Preferably, the cylinder frame is provided with airflow holes, which are connected to the channel and the airflow generator respectively.

[0011] Preferably, the air passage is provided on the side wall of the cylinder frame, and the air passage is arranged in the direction perpendicular to the channel axis. The channel is provided with a first opening for communicating with the inside of the chopping blade and a second opening for allowing external airflow into the channel in sequence along the direction away from the chopping blade. The air passage is located between the first opening and the second opening.

[0012] Preferably, the first opening is provided with an insertion end for inserting a chopping knife, the inner diameter of which is greater than or equal to the outer diameter of the chopping knife.

[0013] Preferably, the number of air passages is even, and each air passage is arranged in a centrally symmetrical manner.

[0014] Preferably, each of the air passages is connected to the same airflow generator.

[0015] On the other hand, the present invention also provides a wire bonding device, including a wedge and the above-mentioned threading device, wherein the sleeve is detachably sleeved on the mouth of the wedge.

[0016] Furthermore, the present invention also provides a method for using the above-mentioned threading device, comprising the following steps:

[0017] S1. Insert the tip of the cleaver into the channel;

[0018] S2. Activate the airflow generator to create a traction airflow inside the chopping blade;

[0019] S3. Move the end of the lead wire inside the chopper away from the mouth, keeping the airflow generator running so that the traction airflow brings the end of the lead wire into the chopper and through the mouth of the chopper.

[0020] Furthermore, the present invention also provides another method of using the above-mentioned threading device, comprising the following steps:

[0021] S10. Insert the tip of the cleaver into the channel;

[0022] S20. Activate the airflow generator to create a traction airflow inside the chopping blade;

[0023] S30. Keep the airflow generator running so that the traction airflow carries the broken wire inside the chopper out of the chopper.

[0024] The beneficial effects of this invention are as follows:

[0025] In this invention, a combination of a cylindrical frame and an airflow generator is used to create a traction airflow within the chopping cutter, flowing from the cutter towards the channel. This allows the lead wire located at the inlet of the cutter, or a broken lead wire inside the cutter, to move towards the mouth of the cutter under the influence of the traction airflow, thus completing the threading or removal of the wire from the cutter. The device has a simple structure, effectively reducing the difficulty of the threading operation and improving threading efficiency. It also effectively solves the problem of difficulty in removing broken lead wires inside the cutter, providing good unblocking effect and ensuring that broken lead wire fragments inside the cutter are completely extracted, preventing any residual wire fragments and avoiding the shortened lifespan of the cutter caused by unblocking in existing technologies. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the threading device and the splitting blade of the present invention.

[0027] Figure 2 This is a schematic diagram of the threading device and the splitting blade from another perspective of the present invention.

[0028] Figure 3 This is a schematic diagram illustrating the principle of the threading device of the present invention during use.

[0029] Figure 4 This is a schematic diagram illustrating the principle of the force applied to the lead wire during use of the threading device of the present invention.

[0030] Figure 5 This is a schematic diagram showing the flow direction of the traction airflow and the stop airflow during the threading process of the threading device of the present invention.

[0031] Figure 6 This is a cross-sectional view of the threading device of the present invention after the lead wire is threaded. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0033] Please see Figures 1-3 As shown, the present invention discloses a wire bonding device, including a cleaver 1 and a wire threading device. The wire threading device includes a cylindrical frame 2, which is detachably sleeved on the mouth 12 of the cleaver 1. The cylindrical frame 2 includes a channel 3 for communicating with the interior of the cleaver 1. The channel 3 is connected to an airflow generator (not shown) for forming a traction airflow inside the cleaver 1. The direction of the traction airflow is from the cleaver 1 to the channel 3.

[0034] When the wire threading device is used for wire threading, the method of using the wire threading device includes the following steps:

[0035] S1. Insert the mouth part 12 of the cleaver 1 into the channel 3;

[0036] S2. Activate the airflow generator to create a traction airflow inside the chopping blade 1;

[0037] S3. Slightly straighten the end of the lead wire 7 so that the end of the lead wire 7 has a small section with a small arc. Then move the end of the lead wire 7 to the end of the chopper 1 away from the mouth (hereinafter referred to as "inlet 11"). Keep the airflow generator running so that the traction airflow brings the end of the lead wire into the chopper 1 and makes the end of the lead wire 7 pass through the mouth 12 of the chopper 1.

[0038] See Figure 3 and Figure 4 As shown, during use, the cylinder frame 2 is fitted onto the nozzle 12 of the chopper 1, and the airflow generator is activated, causing a traction airflow to form within the channel 3, flowing from the chopper 1 towards the channel 3. Since the interior of the chopper 1 is connected to the channel 3, a similar traction airflow will also form within the chopper 1 flowing towards the channel 3. According to the airflow continuity theorem in aerodynamics, the airflow area increases at the inlet 11, and the traction airflow disperses in a funnel shape. The airflow velocity decreases closer to the outside. Due to the influence of the airflow, in the radial direction of the inlet 11, the airflow inside the inlet 11 is faster, and the airflow outside is slower, creating a pressure difference between the two sides, resulting in pressure (e.g., Figure 4 As shown in P1 and P2), this pressure can drive the end of the lead wire 7 towards the axis of the inlet 11. At the same time, a frictional force parallel to the surface of the lead wire 7 is also formed between the traction airflow and the surface of the lead wire 7 (as shown in P1 and P2). Figure 4 As shown in F1 and F2, the friction force can drive the end of the lead wire 7 to move closer to the inside of the chopping cutter 1. In this embodiment, pressure and friction are used as traction forces. The closer the end of the lead wire 7 is to the inlet 11, the greater the pressure and friction force on the end of the lead wire 7. When the end of the lead wire 7 is close to the inlet 11, the lead wire 7 is affected by the pressure and friction force of the traction airflow and will be pulled inward. The traction airflow pulls the end of the lead wire 7 along the traction airflow through the inlet 11 into the inside of the chopping cutter 1. After the end of the lead wire 7 enters the inside of the chopping cutter 1, since the airflow on both sides is the same, the pressure P1 and P2 are balanced, and only the friction force parallel to the surface of the lead wire 7 remains, which pulls the end of the lead wire 7 to move downward and pulls the lead wire 7 to move towards the mouth 12 of the chopping cutter 1. It passes through the mouth 12 of the chopping cutter 1 and enters the channel 3, thus completing the threading. Then the airflow generator is turned off, the cylinder frame 2 is removed, and the excess lead wire 7 at the mouth 12 of the chopping cutter 1 is removed, and the pressure welding operation can be performed.

[0039] In the prior art, the lead wire end is required to have a relatively long straight section. The threading device of this invention utilizes the principle of automatic threading of the lead wire 7 by traction airflow. The lead wire 7 end only needs a short segment with a small arc, much shorter than the aforementioned straight section. Because the segment is short and does not require a completely straight line, the lead wire 7 end is more easily threaded. Furthermore, in the prior art, the alignment and threading processes are time-consuming. The threading device of this invention eliminates the need for manual alignment of the lead wire 7 end with the center of the cutter 1, greatly reducing alignment requirements. In addition, the reduction of manual threading steps effectively lowers the difficulty of the threading operation and significantly shortens the time spent on the entire threading process. Generally, in the prior art, even a skilled threading operator needs 1-2 minutes to complete one threading operation, excluding any potential blockages before threading. However, using the threading device of this invention, one threading operation only takes about 30 seconds, saving 50%-75% of the time.

[0040] This invention can not only effectively solve the problem of threading the lead wire 7 into the chopping cutter 1, but also effectively solve the problem of the lead wire 7 breaking inside the chopping cutter 1 and being difficult to remove.

[0041] When the threading device is used to unclog blockages, the method of using the threading device includes the following steps:

[0042] S10. Insert the tip of the cleaver into the channel;

[0043] S20. Activate the airflow generator to create a penetrating airflow inside the chopping blade;

[0044] S30. Keep the airflow generator running so that the penetrating airflow carries the broken wire inside the chopping tool out of the chopping tool.

[0045] When the lead wire 7 breaks inside the chopping blade 1, the cylinder frame 2 is attached to the mouth 12 of the chopping blade 1, and the airflow generator is activated. The lead wire 7, which is broken inside the chopping blade 1, is affected by the traction airflow and will be subjected to an inward force. The broken lead wire 7 can be moved out through the mouth 12 of the chopping blade 1 by the traction airflow.

[0046] The threading device of the present invention can efficiently complete the unblocking of the splitter 1. When the lead wire 7 breaks inside the splitter 1, the threading device is used to unblock it first, and then the threading is performed, so that normal production can be carried out. Compared with the prior art, the threading device of the present invention can complete the unblocking and threading process faster and restore normal production operations more quickly.

[0047] In this invention, a combination of a cylindrical frame 2 and an airflow generator is used to create a traction airflow within the chopping cutter 1, flowing from the chopping cutter 1 towards the channel 3. This allows the lead wire 7 located at the inlet 11 inside the chopping cutter 1, or a broken lead wire 7 within the chopping cutter 1, to move towards the mouth 12 of the chopping cutter 1 under the influence of the traction airflow, thus completing the threading or removal of the lead wire from the chopping cutter 1. The device has a simple structure, effectively reducing the difficulty of the threading operation and improving threading efficiency. It also effectively solves the problem of difficulty in removing broken lead wire 7 within the chopping cutter 1, providing good unblocking effect and ensuring that broken lead wire fragments within the chopping cutter 1 are completely extracted, preventing any residual lead wire fragments and avoiding the problem of shortened chopping cutter lifespan caused by unblocking in existing technologies.

[0048] The airflow generator is an air intake unit. When in use, the channel 3 is connected to the air intake port of the air intake unit. When the air intake unit is activated, it draws air from the channel 3, forming a traction airflow from the chopping blade 1 to the channel 3 and creating a negative pressure, so that a traction airflow is also formed inside the chopping blade 1 connected to the channel 3, flowing towards the mouth 12 of the chopping blade 1.

[0049] When the threading device of the present invention is applied to the wire bonding instrument, the tube frame 2 can also be mounted on the main body of the wire bonding instrument via a movable bracket. The movable bracket includes a fixed frame for fixing the tube frame 2. The fixed frame is connected to a rotating arm that can rotate in the horizontal direction. When the threading device is needed, the tube frame 2 is rotated to a position below the splitter 1, and the splitter 1 moves down to connect the two. After use, the tube frame 2 is reset and rotated to the side.

[0050] The tube frame 2 is provided with an air passage hole 4, which is connected to the channel 3 and the airflow generator respectively.

[0051] The air passage 4 can be located at the end of the cylinder frame 2 away from the splitter 1 or on the side wall of the cylinder frame 2. When the air passage 4 is located on the side wall, it is preferable that the number of air passage 4 is even and that each air passage 4 is arranged in a centrally symmetrical manner.

[0052] See Figures 5 to 6 As shown, the air passage 4 is provided on the side wall of the cylinder frame 2, and the air passage 4 is arranged in the direction perpendicular to the axis of the channel 3. The channel 3 is provided with a first opening 5 for communicating with the inside of the chopping blade 1 and a second opening 6 for allowing external airflow to enter the channel in sequence along the direction away from the chopping blade 1. The air passage 4 is located between the first opening 5 and the second opening 6.

[0053] See Figure 5As shown, after the suction unit is activated, it draws air from the channel 3. Since the air passage 4 is located between the first opening 5 and the second opening 6, two airflows in opposite directions are formed at the first opening 5 and the second opening 6. The first opening 5 forms a downward traction airflow, and the second opening 6 forms an upward stop airflow. When in use, the suction unit is activated so that the end of the lead wire 7 is at the entrance of the chopper 1. Under the action of the traction airflow, the lead wire 7 is pulled into the chopper 1. If the lead wire 7 falls too fast and leaks out of the cylinder 2, the end of the lead wire 7 will flow back into the channel 3 or remain in its original state due to the action of the stop airflow and will not fall further. This effectively avoids the problem of too much lead wire 7 protruding from the mouth 12 of the chopper 1, which would increase the amount of lead wire 7 that needs to be trimmed and avoid material waste.

[0054] The present invention utilizes the interaction between the airflow generator and the cylindrical frame 2, which is provided with a first opening 5, a second opening 6 and an airflow hole 4, to form traction airflow and stop airflow in opposite directions within the cylindrical frame 2. The lead wire 7 is guided through by the traction airflow and remains in the channel 3 under the action of the stop airflow, thereby improving the ease and efficiency of threading while reducing material waste.

[0055] The first opening 5 is provided with an insertion end for inserting the chopping knife 1, and the inner diameter of the insertion end is greater than or equal to the outer diameter of the chopping knife 1.

[0056] The insertion end is provided with a protective ring to protect the outer wall of the chopping blade 1. The protective ring can be made of rubber or silicone, etc., to prevent scratching and damage to the chopping blade 1 when the cylinder frame 2 is fitted onto the chopping blade 1.

[0057] See Figure 3 and Figure 5 As shown, the number of air passages 4 is even, and each air passage 4 is arranged in a centrally symmetrical manner to form equal and opposite airflows in the channel 3. In this embodiment, there are two air passages 4, which are arranged on the side wall of the cylinder frame 2 along the same radial direction.

[0058] In one embodiment, each air passage 4 is connected to a corresponding airflow generator. In a more preferred embodiment, each air passage 4 is connected to the same airflow generator, which is more conducive to forming equal and opposite airflows in the channel 3, while reducing equipment costs. Specifically, the airflow generator can be provided with a number of air intakes corresponding to the number of air passage 4, and each air intake is connected to each air passage 4.

[0059] Of course, the above illustrations are only preferred embodiments of the present invention and are not intended to limit the scope of application of the present invention. Therefore, any equivalent changes made to the principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A threading device, characterized in that, The device includes a frame, which includes a channel for communicating with the interior of a chopping blade. The channel is connected to an airflow generator for generating a traction airflow inside the chopping blade, wherein the traction airflow flows from the chopping blade toward the channel. The cylinder frame is provided with air passage holes, which are connected to the channel and the airflow generator respectively. The air passage is located on the side wall of the cylinder frame and is arranged in the direction perpendicular to the channel axis. The channel is provided with a first opening for communicating with the inside of the chopping blade and a second opening for allowing external airflow to enter the channel in sequence along the direction away from the chopping blade. The air passage is located between the first opening and the second opening. The first opening is provided with an insertion end for inserting the chopping knife, and the insertion end is provided with a protective ring to protect the outer wall of the chopping knife.

2. The threading device according to claim 1, characterized in that, The airflow generator is an air intake unit.

3. The threading device according to claim 1, characterized in that, The inner diameter of the insertion end is greater than or equal to the outer diameter of the chopping knife.

4. The threading device according to claim 1, characterized in that, The number of air passages is even, and each air passage is arranged in a centrally symmetrical manner.

5. The threading device according to claim 4, characterized in that, Each of the described air passages is connected to the same airflow generator.

6. A wire bonding device, characterized in that, Includes a chopping blade and a threading device according to any one of claims 1 to 5, wherein the cylinder frame is detachably sleeved on the mouth of the chopping blade.

7. The method of using the threading device according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1. Insert the tip of the cleaver into the channel; S2. Activate the airflow generator to create a traction airflow inside the chopping blade; S3. Move the end of the lead wire inside the chopper away from the mouth, keeping the airflow generator running so that the traction airflow brings the end of the lead wire into the chopper and through the mouth of the chopper.

8. The method of using the threading device according to any one of claims 1 to 5, characterized in that, Includes the following steps: S10. Insert the tip of the cleaver into the channel; S20. Activate the airflow generator to create a traction airflow inside the chopping blade; S30. Keep the airflow generator running so that the traction airflow carries the broken wire inside the chopper out of the chopper.

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