JP3701383B2 - Lead frame and slip sheet separator - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a separation device for alternately taking out and separating lead frames and slip sheets in a supply unit of a device for processing lead frames.
[0002]
[Prior art]
In recent years, semiconductor devices have been increasingly integrated and highly functional, as represented by ASICs, due to the trend toward higher performance and lighter and smaller electronic devices.
Plastic QFP (Quad Flat Package) using a lead frame as a package for providing a multi-terminal IC, particularly an ASIC represented by a gate array or a standard cell, a microcomputer, a DSP (Digital Signal Processor), etc. with high cost performance. It has become mainstream, and now it has been put into practical use up to over 300 pins.
[0003]
The QFP uses a lead frame 420 shown in FIG. 4B. As shown in FIG. 4A, the QFP is an inner surface on which a semiconductor element 410 is mounted on a die pad 421 and subjected to surface treatment such as silver plating. The leading end of the lead 422 and the terminal 411 of the semiconductor element 410 are connected by a wire 430 and sealed with a sealing resin 440. Thereafter, the dam bar portion 424 is cut, and the outer lead 423 is formed into a gull wing shape. Is. As described above, the QFP has been developed as a structure that can cope with the increase in the number of terminals by providing the outer leads 423 for electrical connection with the external circuit in the four directions of the package.
FIGS. 4B and 4B are cross-sectional views taken along line F1-F2 in FIGS.
The lead frame 420 used here is usually made of a metal material having high electrical conductivity and high mechanical strength such as 42 alloy (42% nickel-iron alloy) or copper alloy, and is a photo-etching method or stamping. By the method, it was produced in a shape as shown in FIG.
Usually, after a plurality of lead frames shown in FIG. 4 (b) are subjected to external processing such as etching, plating processing for wire bonding or the like, mounting of semiconductor elements, resin sealing The method of stopping and separating this is taken.
[0004]
As described above, when performing plating processing for wire bonding, etc., on the lead frame that has been subjected to outer shape processing, conventionally, the lead frame that has been subjected to outer shape processing is stacked on the lead frame mounting table, Once stocked, this was appropriately adsorbed on one side of the lead frame in a lead frame adsorption chamber and supplied to the processing apparatus.
However, when the lead frame is placed on the mounting table and once stocked, oil paper or the like is inserted between the lead frames to prevent rusting of the lead frame, and the interleaving paper and the lead frame are laminated alternately. Therefore, when adsorbing a lead frame from a stack of alternately stacked lead frames and interleaving paper, the interleaving paper immediately adsorbs to the interleaving paper immediately below the lead frame to be adsorbed. There was a problem that it was difficult to adsorb only the frame.
Even if the problem of adsorbing the slip sheet is solved, there is another problem that the slip sheet adheres to the lead frame due to the influence of static electricity. Even if the slip sheet adhering to the lead frame due to static electricity falls in the middle of conveyance, the dropping position is irregular, and therefore the suction nozzle for discharging the slip sheet cannot reliably suck the slip sheet.
[0005]
Further, a conventional apparatus for supplying a lead frame to a processing apparatus will be briefly described below with reference to FIG.
The method of supplying the lead frame to the processing apparatus is a case where the problem of adsorbing the interleaf paper when adsorbing the lead frame 370 by the adsorbing unit 310 is solved. , Is not solved.
First, it is assumed that the lead frame 370 is on the top of the stack 390 stacked on the mounting table 320.
First, the suction part 310 that sucks the lead frame by applying a negative pressure inside the chamber 311 is brought into contact with one surface of the lead frame 370 of the stack 390 stacked on the mounting table 320 from the state of FIGS. The lead frame 370 is sucked to the suction part 310. (Fig. 3 (a) (b))
Next, the suction unit 310 is moved so that only the sucked lead frame 370 is separated from the stack 390. (Fig. 3 (a) (c))
Thereafter, the suction unit 310 is further moved to a predetermined position, and the lead frame 370 is supplied to the processing apparatus.
On the other hand, there is an interleaf 380 on the top surface of the stack 390 stacked on the mounting table 320. As shown in FIG. 3B, the interleaf 380 includes an interleaf adsorbing portion. It is sucked and removed by the nozzle 311 of 340.
When slip sheets adhere to the lead frame due to static electricity, the slip sheets 380 adhere to the lead frame 370 sucked by the suction portion 310 as shown in FIGS. The paper falls due to its own weight in the middle of conveyance, as shown in FIGS. 3C and 2B, but the dropping position is irregular.
Therefore, there are many cases where the slip sheet 380 cannot be sucked and removed by the nozzle 341 of the slip sheet suction part 340.
[0006]
[Problems to be solved by the invention]
As described above, the lead frame and the interleaving paper are alternately taken out and separated from the stacked product in which the lead frame and the interleaving paper are alternately stacked. When separating from the stack, not only the slip sheet is not adsorbed, but also a solution to the problem of the slip sheet adhering to the lead frame has been demanded.
Under such circumstances, the present invention processes a lead frame that can be accurately taken out and separated alternately from the stack of lead frames and slip sheets alternately stacked as described above. It is an object of the present invention to provide a separation apparatus that supplies the apparatus.
[0007]
[Means for Solving the Problems]
The lead frame and slip sheet separating apparatus according to the present invention takes out the lead frame and slip sheet alternately from a stack in which the lead frame and slip sheet are alternately stacked and the slip sheet extends to the outside of the lead frame region. A separation apparatus for separating a lead frame and a slip sheet for separating, at least, a suction portion that sucks the lead frame on one surface thereof, and a loading portion that loads the entire stack of lead frames and slip sheets that are alternately stacked. When the lead frame is sucked, the slip sheet separating unit is configured to include a slip sheet separating unit for separating the slip sheet from the lead frame to be sucked and a slip sheet sucking unit for sucking and removing the slip sheet. When adsorbing the lead frame, the interleaving paper is pressed against the stacking part at a plurality of locations outside the interleaving paper that are not in the lead frame area. While adsorbing the lead frame while pressing it against the loading part, it separates the adsorbed lead frame away from the stack, and the interleaf adsorbing part is removed from a predetermined position when removing the interleaf. It moves on the stack and adsorbs and removes the interleaving paper.
And the above-mentioned adsorption | suction part performs the operation | movement which leaves | separates from a stack | stacking object only by the movement of an adsorption | suction part, adsorb | sucking a lead frame.
In addition, the suction unit described above is characterized in that the operation of moving away from the stack while sucking the lead frame is performed by both the movement of the suction unit and the movement of the stacking unit.
In addition, the slip sheet separating portion in the above is attached to the outer peripheral portion of the suction portion, and is configured to move the pressing portion that presses the slip sheet by a cylinder operation that expands and contracts to press the slip sheet to the stacking portion side. It is characterized by.
[0008]
[Action]
By adopting such a configuration, the lead frame and slip sheet separating apparatus of the present invention can take out and separate the lead frame and slip sheet accurately and alternately from the stacked product in which the lead frame and slip sheet are alternately stacked. It is possible to provide a separation device for lead frames and slip sheets.
The lead frame and slip sheet separating apparatus according to the present invention takes out the lead frame and slip sheet alternately from a stack in which the lead frame and slip sheet are alternately stacked and the slip sheet extends to the outside of the lead frame region. A separation device for separating the lead frame and the interleaf paper for separation, and more specifically, an adsorption portion for adsorbing the lead frame on one surface thereof, and a loading portion for loading the entire stack of lead frames and interleaf sheets alternately stacked When the lead frame is sucked, the slip sheet separating unit is configured to include a slip sheet separating unit for separating the slip sheet from the lead frame to be sucked and a slip sheet sucking unit for sucking and removing the slip sheet. When adsorbing the lead frame, the interleaving paper is pressed against the stacking unit at multiple locations on the outer side of the interleaving paper that is not the lead frame area. While adsorbing the lead frame, the adsorbed lead frame is separated by separating the adsorbed lead frame while adsorbing the lead frame. This is achieved by moving to, and removing the interleaving paper by suction.
Specifically, the adsorption unit performs the operation of separating the stack while adsorbing the lead frame only by moving the adsorption unit, or by both the movement of the adsorption unit and the movement of the stacking unit. Is attached to the outer peripheral portion of the suction portion and the interleaf is pressed against the stacking portion, so that the entire apparatus has a relatively simple configuration.
[0009]
【Example】
An embodiment of the lead frame and slip sheet separating apparatus of the present invention will be described below with reference to FIG.
FIG. 1A is a side view showing the lead frame and slip sheet separating apparatus of the embodiment, and FIG. 1B is a plan view showing a part of the position where the slip sheet separating unit presses the slip sheet. is there.
In FIG. 1, 100 is a separation device, 110 is an adsorption unit, 111 is a chamber, 111S is a chamber surface, 112 is a negative pressure pipe, 116 is a variable support unit, 117 is a vertical drive unit, 118 is a support column, and 119 is a movable support. Part, 120 is a loading part, 121 is a lifting jack, 122 is a mounting table, 123 is a variable support part, 130 is a slip sheet separating part, 131 is a pressing part, 131A is a pressing part (plan view), 132 is a cylinder part, 140 is a slip sheet adsorbing section, 141 is a tube, 142 is a suction section, 170 is a lead frame, 180 is a slip sheet, and 190 is a stack.
The lead frame and slip sheet separating apparatus 100 according to the present embodiment includes a lead frame 170 and a slip sheet 180 alternately stacked, and the lead frame 180 is stacked from the stack 190 in which the slip sheet 180 extends to the outside of the lead frame 170 region. This is a device for separating the lead frame 170 and the interleaf paper 180 alternately and separating them, and for supplying the lead frame 170 to a processing apparatus such as plating for wire bonding.
As shown in FIG. 1A, an adsorbing portion 110 that adsorbs the lead frame 170 on one surface thereof, a loading portion 120 that loads the entire stack 190 in which the lead frames 170 and the interleaf sheets 180 are alternately stacked, and leads When adsorbing the frame, the interleaving paper separating unit 130 presses the interleaving paper 180 toward the stacking unit 120 so that the interleaving paper is separated from the adsorbed lead frame, and the interleaving paper for adsorbing and removing the interleaving paper 180. It consists of a suction part 140.
[0010]
The suction part 110 includes a chamber 111 having a negative pressure. The suction part 110 sucks and sucks the lead frame by opening a hole having a predetermined shape on the surface (111S) of the chamber 111 on the side in contact with the lead frame. The chamber 111 having a negative pressure is normally set to a negative pressure through a negative pressure pipe 112.
The negative pressure pipe 112 is a pipe for lowering the chamber 111 from the outside air by setting the negative pressure to a pressure lower than the outside air.
The chamber surface 111S is fixed in an adjustable manner so that one surface 111S of the chamber 111 that has been subjected to negative pressure is in contact with the lead frame surface in a substantially parallel state.
Then, while the interleaving paper separating unit 130 presses the interleaving paper 180 toward the stacking unit 120, the adsorbing unit 110 adsorbs the lead frame 170 while adsorbing the lead frame 170 so as to be separated from the stack 190. Isolate.
The chamber portion 111 is fixed by the variable support portion 116 and moved by the vertical drive portion 117 so that the chamber portion 111 can move up and down.
The chamber unit 111, the vertical drive unit 117, the variable support unit 116, and the interleaf separation unit 130 are supported by a support column 118, and the support column 118 is supported by a movable support unit 119. .
[0011]
The stacking unit 120 is mounted with a lifting jack 121 and a variable support so that the entire stack 190 in which the lead frames 170 and the interleaf sheets 180 are alternately stacked can be placed on the mounting table 122 in a substantially horizontal state and moved up and down. Part 123 is provided.
[0012]
When adsorbing the lead frame 170, the interleaf separating unit 130 presses a plurality of portions 131A on the outer side of the interleaving paper that is not the lead frame area against the stacking unit 120 as shown in FIG. 110 is attached to the outer periphery. Then, the pressing portion 131 that presses the interleaf paper 180 is moved by a cylinder operation that expands and contracts to press the interleaf paper 180 against the stacking portion 120.
The fixing position of the cylinder 132 can be moved according to the size of the lead frame 170 and the size of the interleaf paper 180.
[0013]
When the interleaf paper 180 is removed, the interleaf paper adsorbing section 140 moves from a predetermined position onto the stack 190 to remove the interleaf paper 180 by suction.
When adsorbing the interleaf paper 180, unlike the case of adsorbing the lead frame, the lead frame immediately below it is not adsorbed together with the interleaf paper. 141 is moved and the interleaf is sucked by the nozzle-like suction part 142 at the tip.
[0014]
Next, an example of the operation of the lead frame / ply paper separator according to this embodiment will be described with reference to FIG.
First, the suction unit 110 is set on a stack 190 in which the lead frames 170 and the interleaf paper 180 are alternately stacked and the interleaf paper 180 extends to the outside of the lead frame region. (Fig. 2 (a))
Next, the suction unit 110 is lowered so that the suction surface 111S of the chamber 111 is in contact with the lead frame substantially in parallel, and the lead frame 170 is sucked. (Fig. 2 (b))
Next, the suction part 110 is raised and the stacking part 120 is lowered, and the cylinder part 132 is moved so that the pressing part 131 of the slip sheet separating part 130 fixed to the suction part 110 continues to push the slip sheet 180 onto the stacking part 120. Operate and keep the cylinder part extended. (Fig. 2 (c))
After the adsorbing unit 110 adsorbs only the lead frame 170 and is sufficiently separated from the stack 190 on the stacking unit 120, the cylinder unit 132 of the slip sheet separating unit 130 is operated so that the linder unit is contracted and the pressing unit 131 is operated. Is separated from the interleaf paper 180. (Fig. 2 (d))
[0015]
In this manner, the lead frame 170 placed on the top of the stack 190 on the stacking unit 120 in FIG. 2 (a) can be separated from the stack 190.
By moving the entire suction unit 110 in the state shown in FIG. 2D, only the lead frame can be conveyed and supplied to a desired processing apparatus.
Further, in the state of FIG. 2D, the slip sheet 180 is placed on the top of the stack 190 on the stacking unit 120. The suction of the slip sheet 180 is performed when the lead frame 170 is sucked. In contrast, since the lead frame immediately below is not adsorbed and the lead frame is not attached to the interleaf by static electricity, the interleaf adsorbing portion 140 is simply moved from the predetermined position onto the stack 190. The interleaf paper 180 is removed by suction.
[0016]
Then, by repeating the adsorption separation of the lead frame and the adsorption separation of the interleaf, it is possible to continuously supply the lead frame from the stack 190 on the stacking unit 120 to a desired processing apparatus.
[0017]
【The invention's effect】
As described above, the present invention can provide a lead frame and slip sheet separating apparatus capable of accurately taking out and separating the lead frame and slip sheet alternately from the stacked product in which the lead frame and slip sheet are alternately stacked. It is said.
As a result, the lead frame can be accurately provided to a processing apparatus such as a lead frame plating process.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a lead frame and slip sheet separating apparatus according to an embodiment. FIG. 2 is a diagram for explaining the operation of the lead frame and slip sheet separating apparatus according to the embodiment. Schematic configuration diagram of the separation device for paper and slip sheet [Fig. 4] Diagram of semiconductor device and lead frame [Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Separator 110 Adsorption part 111 Chamber 111S Chamber surface 112 Depressurization piping 116 Variable support part 117 Vertical drive part 118 Support pillar 119 Movable support part 120 Loading part 121 Lifting jack 122 Mounting stand 123 Variable support part 130 Interleaf separation part 131 Press Part 131A Pressing Location 132 Cylinder Part 140 Interleaf Adsorbing Part 141 Pipe 142 Suction Part 170 Lead Frame 180 Interleaf 190 Stacked Part 310 Adsorbing Part 311 Chamber 320 Mounting Table 340 Interleaf Adsorbing Part 341 Nozzle 370 Lead Frame 380 Interleaf 390 Stacked 400 Semiconductor device 410 Semiconductor element 411 Terminal 420 Lead frame 421 Die pad 422 Inner lead 423 Outer lead 424 Dam bar 425 Frame (frame) part 430 Wire 440 Sealing tree

Claims (4)

Lead frame and interleaf paper separating device for alternately taking out and separating the lead frame and interleaf paper from the stack in which the leadframe and interleaf paper are alternately stacked and the interleaf paper extends to the outside of the lead frame area. At least a suction part that sucks the lead frame on one side, a stacking part that loads the entire stack of stacked lead frames and slip sheets, and a slip sheet when sucking the lead frame. A slip sheet separating unit for separating the lead frame and a slip sheet adsorbing unit for sucking and removing the slip sheet. The slip sheet separating unit is not a lead frame region when sucking the lead frame. The slip sheet is pressed against the stacking unit at multiple locations on the outer side of the slip sheet, and the suction unit is used to read the lead frame while the slip sheet separator is pressing the slip sheet toward the stacking unit. The adsorbed lead frame is separated so as to be separated from the stack while adsorbing the sheet, and the interleaf adsorbing portion moves from the predetermined position onto the stack when adsorbing the interleaf. A device for separating a lead frame and a slip sheet, which is to be removed. The lead frame and slip sheet separating apparatus according to claim 1, wherein the suction unit performs the operation of separating from the stack while only sucking the lead frame, only by moving the suction unit. The lead frame and slip sheet separating apparatus according to claim 1, wherein the sucking unit performs the operation of separating the stacked body while sucking the lead frame by both the movement of the sucking unit and the movement of the stacking unit. The slip sheet separating portion according to claims 1 to 3 is attached to the outer peripheral portion of the suction portion, and moves the pressing portion that presses the slip sheet by a cylinder operation to expand and contract, thereby pressing the slip sheet to the stacking portion side. An apparatus for separating a lead frame and a slip sheet.

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