KR100259874B1 - Strips transporting apparatus for a semiconductor package - Google Patents

Abstract

PURPOSE: A strip transferring apparatus for a semiconductor package is provided to improve the transfer reliability of the strip, to save manufacturing costs, and to enhancing the working productivity. CONSTITUTION: A conveyer(10) transfers strips(110) supplied from a previous process. A lifter(20) lifts the strips transferred by the conveyer(10) to separate the strips. A gripper feed(30) grips the strips lifted by the lifter(20) to feed the strips to a loading rail(40). A pusher(50) is mounted in rear of the loading rail to push the strips seated on the loading rail and mount the strips on a magazine. An elevator(60) drops a plurality of magazines having the strips mounted one by one and dismounts the magazines.

Description

Strip transporting apparatus for a semiconductor package

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for transferring strips for semiconductor packages, and more particularly, to solder balls serving as solder pads and external leads of a ball grid array (BGA) substrate by a furnace. The present invention relates to a device for transferring a strip for semiconductor package for transferring / loading a strip for a BGA semiconductor package in a magazine in an electrically connected state by solder balls being fused together.

BGA packages are surface mounted on electrical and electronic devices such as printed circuit boards (PCBs). Solder balls, which serve as external connection terminals, are present on the bottom surface of the BGA package. The mounting density is higher than that of a semiconductor package having a J ″ shaped external lead.

Moreover, the BGA package is a structure in which the deterioration in reliability caused by the cutting / bending of the external lead of a conventional semiconductor package is fundamentally eliminated, while the extremely short electrical connection length from the semiconductor chip to the solder ball provides high reliability and fast operation. In the field of electrical and electronics where speed is required, it is particularly popular.

Briefly describing the manufacturing process of such a BGA package consists of the following steps.

(a) die attaching

A step of bonding the upper surface of the BGA substrate and the lower surface of the semiconductor chip using an epoxy-based adhesive, followed by curing.

(b) electrical connection process (interconnecting / wire bonding)

A process of electrically connecting a plurality of bonding pads existing in an active area of a semiconductor chip using a plurality of electrode pads existing in a corresponding BGA substrate and individual bonding wires.

(c) molding

A process of encapsulating an electrical connection portion including a semiconductor chip present on the upper surface of the BGA substrate using an epoxy-based thermosetting molding resin.

(d) flux printing and reflowing & cleaning

The flux is applied onto the solder pads present on the lower surface of the BGA substrate, and then the solder balls are seated on the solder pads, and then passed through a means such as a furnace to electrically transfer the solder pads and the corresponding solder balls. Process to connect and to clean and remove foreign substances.

(e) Trimming & Testing

A process of cutting strips for BGA semiconductor packages (hereinafter referred to as "strips") into individual BGA packages and testing them under severe conditions before they are supplied to real consumers.

Among the above-described processes, the strip in which step (d) is completed is loaded on a loading means such as a magazine, and step (e) is performed.

Conventionally, the strip of the step (d) has been completed is loaded in the magazine by the operator, but this method can be implemented inline of the overall process while the transfer reliability and work productivity depend on the worker's working attitude. There was a disadvantage.

As another method, a strip conveyed by a conveyor is recognized by a recognition camera and grabbed and transported by a gripper. However, the strip is caught on the conveyor and damage is generated, resulting in a decrease in yield and a long time detection. While time is required, expensive recognition equipment is required, resulting in a decrease in work productivity and an increase in production cost.

Accordingly, the present invention has been made in consideration of the above-mentioned conventional problems, and an object thereof is to provide an apparatus for transferring strips for semiconductor packages which improves the transfer reliability of the strips, while reducing manufacturing costs and improving work productivity. .

1 is a perspective view showing a strip conveying apparatus for a semiconductor package according to the present invention;

2 is a plan view of FIG.

3 is a front view of FIG. 1,

4 is a cross-sectional view taken along the line IV-IV of FIG.

5a and 5d are taken along the line V-V of Figure 2 is a front view and a plan view showing the operation of the gripper,

6a and 6b are taken along line VI-VI of FIG. 2, showing an excerpt of the pusher,

7A and 7C are partial cutaway front views showing the operation of the elevator, taken along the line of FIG.

<Explanation of symbols for main parts of drawing>

10 conveyor 11 drive means

15: conveyor belt 15d: rail portion (of the conveyor belt)

18: stopper 20: lifter

21: sensor 22: second motor

23: lifting fork 24: contact portion (of lifting fork)

30: gripper feed 31: rail frame

32: head 33: pincher

36: finger (pincher) 40: loading rail

41: fixed rail 42: movable rail

47: Seating jaw (of fixed rail) 48: Seating jaw (of movable rail)

50: pusher 51: screw

53: plate 60: elevator

61, 62: upper and lower base

63: body 65: mounting means

66: lifting means 67: ejector

110: strip for BGA semiconductor package

120: magazine

The object of the present invention as such is a conveyor for conveying strips supplied from a preceding process; A lifter spaced apart from the strip conveyed by this conveyor; A loading rail on which a strip separated from the conveyor is seated by this lifter; A gripper feed for transferring a strip for a semiconductor package spaced from a conveyor by a lifter onto a loading rail; A pusher installed at a longitudinal rear end of the loading rail to push the strip seated on the loading rail to be mounted on the magazine; And it is achieved by the apparatus for transferring a strip for a semiconductor package comprising a; an elevator (elevator) for mounting and descending after mounting a plurality of magazines on which the strip is mounted sequentially one by one.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to describing the device 100 for transporting strips for semiconductor packages of the present invention, the inventor (s) may describe the latter stages and tactics of each device in which the device 100 is subjected to a flux application process and a reflow process separately. It is pointed out in advance that the flux application process and the reflow process can be installed and used after the inlined device.

1 to 7, the apparatus 100 for transporting strips for semiconductor packages according to the present invention includes a conveyor 10 for transporting strips 110 supplied from a preceding process, and the conveyor 10 transported by this conveyor 10. A lift 20 for lifting the strip 110 up and away from it, a gripper feed 30 for holding the strip 110 lifted by the lift 20 and moving it onto the loading rail 40 described below; The loading rail 40 on which the strip 110 moved by the gripper feed 30 is seated, and the pusher 50 for pushing the strip 110 placed on the loading rail 40 to be mounted on the magazine 120. ), And the elevator (60) intermittently lowered so that the strip (110) moved by the pusher (50) by mounting the magazine (120) is sequentially loaded from the bottom of the magazine (120) and the frame (70) for mounting and supporting them. It is composed of

The conveyor 10 includes a drive belt 11 and a conveyor belt 15 for circulating a required path by the drive means 11 to transfer a plurality of strips 110 supplied from a preceding process to its detached position. It is provided with a stopper 18 provided at intervals in front of the conveyor belt 15 to stop the strip 110, which is carried on the conveyor belt 15, at its detachable position.

The driving means 11 is a motor that connects the first motor 12 and the plurality of roller shafts 13 and the first motor 12 and the roller shafts 13 which are arranged at intervals in the horizontal direction so as to be mutually rotatable. Made of a belt 14.

Conveyor belt 15 preferably has a wire mesh structure composed of a wire (15a), etc., which is a conveyor belt in the process of transferring moisture or chemicals, etc. on the strip 110 in the process of cleaning the strip 110 To fall to the bottom of (15). Accordingly, a plurality of engaging projections 13a, which are fitted into the slots 15b for the stable circulation of the conveyor belt 15, are formed at predetermined angular intervals on the outer circumference of each roller shaft 13 of the driving means 11. Here, if there is a large amount of water or chemicals remaining in the strip 110, a drain pan (not shown) for collecting them may be installed under the conveyor belt 15.

On the other hand, the strip 110 on the conveyor belt 15 stopped by the stopper 18 is separated from the conveyor belt 15 by being lifted by the lifter 20, so that the conveyor belt 15 has the lifter 20 It is provided with a loading unit 16 and an unloading unit 17 arranged in a line at intervals so that it can be elevated without interference. Accordingly, as shown in FIG. 4, the transmission belt 14 of the driving means 11 moves the first motor 12 to at least one roller shaft 13 of the loading part 16 and the unloading part 17. ) To be connected at the same time. The unloading portion 17 of the conveyor belt 15 has a length shorter than the length of the strip 110 so that the lifter 20 can raise the strip 110 so that both ends of the strip 110 are stopped when the strip 110 is stopped. Protrudes appropriately to the front and rear of the unloading section 17.

In the plurality of wires 15a constituting the conveyor belt 15, a plurality of guide protrusions 15c for preventing the flow of the strip 110 during transportation are provided in the longitudinal direction, that is, the width of the conveyor belt 15. The guide protrusions 15c of the wires 15a are formed at positions corresponding to the guide protrusions 15c of the adjacent wires 15a. Therefore, the conveyor belt 15 is formed by guide protrusions 15c of each wire 15a, and a plurality of rail portions 15d on which the strips 110 are placed are formed along the width direction thereof. The width of the portion 15d is formed wider than the width of the strip 110.

The lifter 20 is installed on the stopper 18, the sensor 21 for detecting the completion of the transfer of the strip 110, the second motor 22 is selectively driven according to the detection signal of the sensor 21, It consists of a lifting fork 23 which is lifted by the second motor 22 and lifts both ends of the strip 110 stopped by the stopper 18. The two contacts 24 of the lifting forks 23, which respectively contact the lower ends of both ends of the strip 110, are unloaded between the loading part 16 and the unloading part 17 of the conveyor belt 15 and the stopper 18 with the stopper 18. It is located between the loading section 17, respectively. A plurality of such lifters 20 are provided and installed to correspond to the strips 110 in each row.

The gripper feed 30 may employ a configuration of a conventional desktop top robot, for example, a rail frame 31 mounted on an upper portion thereof to be orthogonal to a traveling direction of the conveyor belt 15. ), A pin 32 movably mounted to the rail frame 31, and a pincher for holding the strip 110 mounted to the head 32 and lifted by the lifter 20. It consists of

Although not shown, the rail frame 31 includes a driving means such as a ball screw for moving the head 32, and an actuator such as a cylinder for lifting and lowering the pincher 33 in the head 32. ) May be provided. The pincher 33 includes a base 34 installed on the head 32, two guide rods 35 installed on both sides of the base 34 so as to be orthogonal to the conveying direction of the strip 110, and the guide rod ( The two ends 36 are movably coupled to 35 so as to move two fingers 36 disposed at intervals to face each other, and driving means for moving each finger 36 closer or farther from each other. The driving means may be configured in various forms. For example, the third motor 38 having the pinion 38a on the rotation axis, and the third motor 38 are fixed to the two fingers 36 so as to be parallel to each other. It may be composed of a rack 39 which is engaged at the same time to the pinion (38a) of. In addition, a supporting jaw 37 is formed inside the lower end of each finger 36 so that both edges of the lower surface of the strip 110 may be placed thereon.

The loading rail 40 guides the strip 110 to be mounted in the magazine 120. The loading rail 40 adjusts the width of the loading rail 40 so as to transfer strips 110 having various sizes regardless of the size of the strip 110. It is preferable that the bar can be composed of a fixed rail 41 and parallel to the fixed rail 41 and the movable rail 42 which is disposed at a distance from the fixed rail 41 and moved relative to the fixed rail 41. do. To this end, both ends of the movable rail 42 are coupled to the guide rails 43 and screwed to the screw 45 connected to the fourth motor 44 and the electric belt 46. In addition, seating jaws 47 and 48 are formed at both upper edges of the strip 110 in the widthwise upper ends of the fixed rails 41 and the movable rails 42.

As shown in FIG. 6, the pusher 50 includes, for example, a screw 51 installed in the longitudinal direction on the inner side of the movable rail 42 of the loading rail 40, and a screw on the screw 51. The slider 52 is coupled to move forward and backward, and a compact plate 53 fixed to the upper end of the slider 52 to push the rear end of the strip 110 seated on the loading rail 40. The screw 51 is driven forward and backward by a motor (not shown), which may be controlled by a sensor (not shown) for detecting the strip 110 seated on the loading rail 40. The pusher 50 is preferably provided with at least one guide rod 54 is installed in parallel with the screw 51 and coupled to the slider 52.

The elevator 60 is installed in front of the frame 70, and the upper base 61 in which a plurality of magazines 120 without mounting the strip 110 is seated in parallel, and in the lower portion of the upper base 61. A lower base 62 arranged side by side at intervals, a body 63 for elevating between one end of the upper and lower bases 61 and 62 by mounting one magazine 120 and the upper base 61. Mounting means 65 for mounting the magazines 120 seated on the body 63 one by one, and elevating means 66 for lifting the body 63 on which the magazines 120 are mounted; It consists of an ejector (ejector: 67) for pushing the magazine 120, the mounting of the 110 is completed onto the lower base (62).

The upper and lower bases 61 and 62 are preferably composed of a plurality of rails 61a and 62a which are spaced apart from each other and arranged side by side in the moving direction of the magazine 120 as shown.

The body 63 is intermittently lowered by a predetermined step so that the strip 110 is sequentially mounted from the bottom of the magazine 120 mounted thereon, and the ascension is made at a time. The body 63 is provided with a clamp 64 for fixing the magazine 120.

The mounting means 65 includes a screw 65a installed in the mounting direction of the magazine 120 on the front surface of the upper base 61 and screwed to the screw 65a to mount the magazine 120 on the body 63. Push rod 65b which pushes it intermittently as much as possible, and a guide rod installed in parallel with the fifth motor 65c for driving the screw 65a forward and reverse and the screw 65a for guiding the movement of the mill 65b. It consists of 65d.

The elevating means 66 defines a screw 66a rotatably supported by the support 68, a bush 66b and a screw 66a screwed to the screw 66a and fixed to the body 63. It consists of the 6th motor 66c which drives back.

The ejector 67 consists of a cylinder which is installed horizontally on the support 68, for example, and mounts the strip 110 to push the magazine 120 in the lowered body 63 onto the lower base 62. .

Next, the operation of the apparatus for transferring the strip for semiconductor package according to the present invention configured as described above will be described.

First, the pusher 50 is positioned at the rear of the loading rail 40 as shown in FIG. 6A, and is mounted on the body 63 of the elevator 60 by the mounting means 65 as shown in FIG. 7A. One empty magazine 120 is mounted.

In this state, as shown in FIG. 4, only one strip (110: in the drawing) is provided from the rear end of each apparatus in which the flux applying process and the reflow process are performed separately or from the apparatus in which the flux applying process and the reflow process are inlined. Are arranged in parallel and fed onto the loading portion 16 of the conveyor belt 15, where each strip 110 is located in each of the plurality of rail portions 15d of the conveyor belt 15. When the strip 110 thus supplied is transported on the conveyor belt 15 and its front end contacts the stopper 18, the sensor 21 of the lifter 20 detects this. Then, the second motor 22 is driven in the forward direction by the signal of the sensor 21, whereby the lifting fork 23 is raised to stop the strip (stopped on the unloading portion 17 of the conveyor belt 15) 110 is lifted off the conveyor belt 15.

At this time, since the strip 110 has a very thin thickness, there is a possibility that the strip 110 may be deformed by the vibration of the conveyor belt 14 in the process of being transported on the conveyor belt 15, but the conveyor belt 15 of the transfer apparatus according to the present invention. ) Has a rail portion 15d by a plurality of guide protrusions 15c in contact with both sides of the strip 110, so that deformation of the strip 110 due to the vibration is minimized.

Next, as shown in FIG. 5, the gripper feed 30 grips the strip 110 lifted by the lifter 20, and is transported and seated on the loading rail 40. That is, when the strip 110 is lifted by the lifter 20, as shown in FIG. 5A, the third motor 38 of the pincher 33 is driven in the forward direction, so that the two fingers 36 are guide rods ( It is moved along the direction 35 close to each other to grip the strip 110 on the lifting fork 23 of the lifter 20. Then, the second motor 22 is driven in the reverse direction so that the lifting fork 23 of the lifter 20 is lowered to the initial position, and at the same time, the head 32 of the gripper feed 30 as shown in FIG. 5B. Is moved to the right along the rail frame 31. Subsequently, when the strip 110 reaches the top of the loading rail 40, the head 32 is stopped, and then the third motor 38 is driven in the reverse direction so that the two fingers 36 of the pincher 33 are separated from each other. Is moved in the direction. As a result, the strip 110, which is placed on the base 37 of the two fingers 36, falls and is placed on the seating jaw 47 and 48 of the loading rail 40. In this case, when the actuator 32 for elevating the pincher 33 is provided at the head 32 of the gripper feed 30, the strip 110 may be more stably seated on the loading rail 40.

As described above, when the strip 110 is seated on the road rail 40, a sensor (not shown) senses the same and drives a motor (not shown) of the pusher 50. Accordingly, as shown in FIG. 6B, a screw ( The rotation of the 51 in the forward direction causes the slider 52 to move forward (right in the drawing) along the screw 51. Then, the contact plate 53 mounted on the slider 52 contacts the rear end of the strip 110 seated on the loading rail 40 and pushes it forward so that the strip 110 is mounted on the elevator 60. The inside of the magazine 120 is entered. At this time, since the body 63 of the elevator 60 is located at the top, the strip 110 is mounted on the bottom of the magazine 120. After the strip 110 is mounted in the magazine 120, the slider 52 is moved to the rear, as shown in Figure 6a to retract the mill 53 to the initial position.

Next, after the strip 110 is mounted on the magazine 120, the body 63 is lowered by a predetermined interval and paused by the lifting means 66 of the elevator 60 as shown in FIG. 7B. . That is, the magazine 120 has a layered mounting portion 121 so that a plurality of strips 110 can be stacked in a layer. The elevator 120 can sequentially load the strips 110 to each mounting portion 121 from the lower side. The body 63 of 60 will be lowered only as much as the interval between the mounting portions of the magazine 120.

Such a series of operations are performed continuously to stack a plurality of strips 110 in a layered manner on the mounting portion 121 of the magazine 120. The magazine 120 descends to the lower base 62, which is the lowest, and the top thereof. After the strip 110 is loaded in the mounting portion 121 of the magazine, the ejector 67 pushes the magazine 120 on the body 63 to the left side as shown in FIG. 7C, and the magazine on which the strip 110 is mounted is completed. 120 is separated from the body 63. After the magazine 120 is separated from the body 63, the screw 66a is rotated in the reverse direction by the sixth motor 66c of the elevating means 66, so that the body 63 rises onto the upper base 61. Done. After the empty body 63 rises as described above, as shown in FIG. 7A, the fifth motor 65c of the mounting means 65 is driven for a predetermined time to rotate the screw 65a. Then, the push plate 65b moves toward the body 63 by a predetermined distance along the screw 65a and pushes the magazine 120 mounted on the upper base 61 in parallel to the right. The best position magazine 120 is located to be mounted to the body (63). Thereafter, the series of operations as described above are continuously performed to transfer the strip 110.

In the above, the present invention has been described with reference to the above-described embodiments. However, the present invention is not limited thereto. For those skilled in the art to which the present invention pertains, flux coating, for example, an apparatus for manufacturing a ram module, may be used. It is self-evident that it can be installed / applied at the rear end of the apparatus and the reflow process apparatus or at the rear end of the inlined apparatus.

As described above, according to the present invention, the entire process of manufacturing a strip for a semiconductor package can be configured in-line to automatically transfer the strip, thereby improving transfer reliability and workability of strips having various widths. In addition, since the strip supplied from the preceding process is sensed by the sensor, it has a simple structure compared to the conventional recognition camera, but the detection speed is very short, thereby ensuring a fast and accurate operation.

Therefore, the present invention can improve productivity and reliability of semiconductor package manufacturing, and also has an excellent effect of contributing to cost reduction.

Claims (12)

A conveyor for transporting the strips supplied from the preceding process; A lifter spaced apart from the strip carried by the conveyor; A loading rail on which a strip spaced from the conveyor is seated by the lifter; A gripper feed for transferring a strip for a semiconductor package spaced apart from a conveyor by the lifter onto the loading rail; A pusher installed at the rear end of the loading rail in a longitudinal direction to push the strip seated on the loading rail to mount in the magazine; And an elevator that sequentially mounts a plurality of magazines on which the strip is mounted one by one, descends, and then detaches the elevator. According to claim 1, The conveyor is conveyed from the semiconductor manufacturing apparatus including a conveyor belt having two wire mesh structure interlocked by the drive means and spaced apart from each other, and a stopper provided spaced apart from the front conveyor belt And the other end of the strip is disposed between the spaced conveyor belts when one end of the strip is in contact with the stopper. 3. The apparatus of claim 2, wherein the conveyor belt has a plurality of spaced apart rails each having a width wider than the width of the strip in the same direction as the strip is conveyed. 3. The two conveyor belts of claim 1 or 2, wherein the lifter includes a pair of contacts driven and lifted by a sensor installed in the stopper and a signal sensed by the sensor. And a pair of contacts simultaneously lift the lower surface of the strip, respectively located at the lower end between them and between the conveyor belt and the stopper installed at the front. 5. The apparatus of claim 4, wherein the width of the contact portion is wider than the width of the strip being conveyed. 2. The gripper of claim 1, wherein the gripper feed is interlocked with a drive means to be spaced apart from the conveyor by the lifter in conjunction with a head operated in a direction perpendicular to and / or in a vertical direction with respect to a conveying direction of the strip and a drive means installed in the head. And a finger for gripping both sides of the stripped strip. The device of claim 6, wherein a supporting jaw is formed on opposite inner surfaces of the finger to support edges of both bottom surfaces of the strip. 2. The apparatus of claim 1, wherein the width of the loading rail is wider than the width of the strip. According to claim 1, The elevator, the upper base on which at least one magazine is seated, a push plate for pushing a magazine seated on the upper base in conjunction with a drive means, and the magazine is mounted and driven by the push plate For a semiconductor package comprising a body which is linked to the means lowered at regular intervals, an ejector for separating the magazine loaded with the strip from the body, and a lower base on which the magazine separated from the body by the ejector is seated Device for transporting strips. 10. The apparatus of claim 1 or 9, wherein the body of the elevator is intermittently lowered by an interval of strips loaded in the magazine. 10. The apparatus of claim 9, wherein the upper and lower bases are composed of a plurality of rails arranged side by side and spaced apart from each other. 12. The apparatus of claim 9 or 11, wherein the pushplate is movably coupled to a guide rod disposed side by side with the rail.

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