JPH0628270B2 - Foil sticking device - Google Patents

Abstract

PURPOSE:To adhere a foil on a lead frame stably by a method wherein the edge part of the tip of a cutter is pressed against the upper surface of the foil and a notch is formed in the lead frame through the foil by the edge part to fix the cut end of the foil to the lead frame by pressure. CONSTITUTION:When the end of a belt-shape foil 2 is cut and the cut foil 2 is bonded to a lead frame 24, a notch is formed in the lead frame 24 by the edge part 35 of a cutter 13 through the foil 2 at the time of cutting the foil 2 to fix the cut end of the foil 2 to the lead frame 24 by pressure. When the notch is formed, the cut end of the foil 2 is pressed against the lead frame 24 and the foil 2 is made to bite into the notch. With this constitution, even if the foil on the lead frame is not sufficiently melted, the foil does not peel off and a stable adherence can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention is designed to cut an end portion of a foil of a band-shaped body fed by a foil feeding device and attach the cut foil onto a lead frame. The present invention relates to a foil sticking device.

(B) Conventional technology Generally, as a semiconductor assembly device, a gold foil or a solder foil is placed on a lead frame, and when semiconductor pellets are placed on the gold foil or solder foil, it is preheated from below the lead frame by a heating device. Place the foil cut into a predetermined length by suction means, for example, placed on the lead frame after suction with a vacuum chuck, in a state where the foil is melted,
When a semiconductor pellet is mounted, the pellet is integrated with the lead frame, and when the lead frame is moved from the heating means and cooled, the pellet is fixed to the lead frame.

An example of this is the die bonder made by Shinkawa Co., Ltd., HIGH-.
SPEED FULL AUTOMATIC DIE
The above-mentioned structure described in the drawing (DOO 9100) of the instruction manual attached to the BONDER model SPM-FA-TC-5 can be mentioned.

According to this conventional technique, a vacuum chuck is first required as a suction means, and since only the foil sucked by the vacuum chuck is placed on the lead frame, the position of the foil is displaced or the foil is melted. If not, there was a drawback that the foil would peel off without adhering to the frame.

Further, Japanese Utility Model Laid-Open No. 54-157561 discloses a technique in which a solder wire material equivalent to a foil is crimped to a metal base material equivalent to a lead frame by a pressure-bonding body, and the solder wire material is cut by a cutter. Is disclosed.

However, in this case, at least a crimping body and a cutter are required, and there is a drawback that the device structure becomes complicated.

(C) Problem to be Solved by the Invention Therefore, an object of the present invention is to make it possible to surely adhere the foil to the lead frame with a simple device structure.

(D) Means for Solving the Problems Therefore, according to the present invention, the end of the foil of the strip-shaped body fed by the foil feeding device is cut, and the cut foil is pasted on the heated lead frame. In the foil sticking device described above, the lower end portion is formed into an acute-angled edge portion so as to form a notch in the lead frame by passing the foil through the cut side end portion side of the foil sent out on the lead frame by a predetermined length. A cutter that can move up and down, and a foil from the spool is sandwiched when it is forwarded and sent out onto the lead frame, and when it is returned, it is caught in the notch formed in the lead frame by the edge part of the cutter that moved down And a reciprocating chuck that pulls the foil while holding it and cuts at the end on the cutting side.

(E) Action With the above configuration, the foil is fed from the spool to the lead frame for a predetermined length by the forward movement of the chuck while being sandwiched by the chuck. Next, a cutter having a sharp edge at the lower end moves downward so as to form a notch in the lead frame by passing the foil through the cut side end of the foil fed out by the predetermined length, and the lead is passed through the foil. While forming a notch in the frame, the notch is in a state of being bitten by the foil. Then, the chuck moves the foil while sandwiching the foil and pulls the foil, so that the foil is cut at the end portion on the cutting side and attached to the lead frame.

(F) Embodiments The present invention will be described with reference to the drawings. FIG. 1 is a front view of a foil feeding device and a foil sticking device, and FIGS. 2 (a) to (d) are operation explanatory diagrams of the foil feeding device. 3 (a) and 3 (d) are side views and plan views showing an example of a cutter used in the foil sticking apparatus, and FIG. 4 is an explanatory view when the cutter is in operation.

In the drawing, (1) is a foil spool in which a long strip-shaped foil (2) is wound, (3) is a guide roller, and (4) and (5) are light-emitting elements constituting a foil end detection unit. And a light receiving element, (6) and (6) are optical guide plates having slits (7) and (7), (8) and (8) are first chucks, and (9) and (9) are the first chucks. A first guide part for guiding reciprocating motion in the left-right direction, (10) a second chuck, (11) and (11) a second guide part for guiding the vertical motion of the second chuck, (12) (12) is a fixed foil guide for guiding the rightward drawing of the foil, (13) is a cutter, (14), (14)
Is a third guide part for guiding the vertical movement of the cutter, (1
5) (16) (17) (18) are the first, second, third and third for vertically moving and reciprocating left and right of the first chuck, vertically moving the second chuck, and vertically moving the cutter, respectively. 4 drive source,
(19) (20) is a control section connected to the first power source and the light receiving element for the light emitting element, (21) is a mechanism section mounting plate on which the constituent elements are mounted, and (22) is a second section A heat block connected to the power supply (23) and having a lead frame (24) as an object mounted thereon, (25) is a rotating cam for swinging the mechanism mounting plate, and (26) is Cam contact roller, (27) (2
8) is a support shaft that rotatably supports the rotating cam (25) and the cam lever (29), and (30) and (31) are support legs to which the support shafts (27) and (28) are attached, respectively. Reference numeral (32) is a base portion, (33) is a stopper that regulates the swinging angle of the mechanism portion mounting plate, and (34) is a spring that biases the mechanism portion mounting plate in the clockwise direction.

Now, with the tip of the foil (2) pulled out from the foil spool (1), the operator can hold the foil (2) between the first chucks (8) and (8) as shown in FIG. , A to the right in the drawing by the drive source. At this time, the foil (2) moves from the position D to the right in the drawing. (Fig. 2 (a)) Next, the first chucks (8) and (8) move to the right to the C position shown in Fig. 2 (b), and the tip of the foil (2) is cut (13). When reaching the lower position of the cutter (13), the cutter (13)
At the position E, the edge portion (35) of the tip of the cutter (13) presses the foil (2) from above so that the end portion of the foil (2) on the cutting side is attached to the lead frame (24). While crimping and moving the first chucks (8) (8) to the left, B shown in Fig. 2 (C)
Retract to position.

By retreating the first chucks (8) (8) from the C position to the B position, the foil (2) has a length of EF, that is, a predetermined length 1.
It is surely cut by the pulling force of the cutter (13) and the first chucks (8), (8).

When the cutting work is completed, the first chuck (8) (8)
The clamping force of is released, and the A position shown in FIG.
When it is retracted to the position, it becomes a standby state for the next cutting work.

Here, when the first chuck (8) (8) is moved backward from the position B to the position A as the holding force release standby position, the second
Raise the chuck (10) of the to the fixed foil guide (12),
Hold it to prevent the foil (2) from retracting. In the above cutting step, the lead frame (24) is pressed to cut the foil (2) to the predetermined length, the foil piece (36) having the predetermined length to the frame (24). In order to make the contact as close as possible, the spindle (27) is rotated clockwise, while the tip of the foil (2) is the lead frame in the step of feeding the foil (2).
Rotate it counterclockwise to prevent it from being bent by touching (24). For such rotation, a motor or a cylinder may be used as a drive source.

The foil (2) wound around the foil spool (1) disappears, and is detected by the light reaching the light receiving element (5) from the light emitting element (4) through the guide holes (6) and (7). And the first chuck
(8) When the urging of the drive source to the (8) and the second chuck (10) is stopped, and the foil (2) is placed on the lead frame (24) by a predetermined amount, the foil is removed. The control unit (20) operates by the detection output from the light receiving element (5) of the end detection unit, and when the drive source is de-energized, an alarm, for example, lighting or blinking of a lamp as an alarm display, and generation of an alarm sound are performed. The end of the foil can be notified to the operator (operator), and the operator turns off the power switch in order to stop the entire operation of the foil feeding device as the supply of the foil or the end of all work.

FIG. 3 shows an example of a cutter used in the foil feeding device, and FIG. 3 (a) showing the side surface thereof, in which the angle (α) of the edge portion (35) is set to a predetermined size. Foil
If the cutting angle (α) with respect to (2) is determined and the length (d) of the edge portion (35) shown in Fig. 3 (a) is determined, the lead frame (2
The conditions for cutting the foil (2) for 4) are determined. That is, when the angle (α) is increased, the edge portion (35) is sharply inserted into the foil (2), and accordingly, the lead frame is passed through the foil (2).
The scratch as a notch on (24) becomes narrower, and conversely, when the angle (α) is decreased, the foil (2) of the edge part (35) is reduced.
The insertion into is close to a right angle, thus widening the scratch as a notch through the foil (2) to the leadframe push (24). When this notch is formed, the cut-side end of the foil (2) is crimped to the lead frame (24) and the foil (2) bites into the notch (see FIG. 4).

Therefore, for the material of the foil and the lead frame (24),
The angle (α) and the length (d) of the edge portion (35) may be adapted.

Also, the mechanism mounting plate (21) rotates the cam (25) with respect to the spindle (27).
The example in which the rotation motor is rotated and the supporting piece (38) is moved up and down in accordance with the rotation of the lever (29) to swing and swing is described. You can do it. In the above embodiment, (33) is a vertically movable stopper, and the mechanism mounting plate (21) is biased clockwise by the spring (34) with respect to the support shaft (27), and the stopper (33 The screw as) is constructed so that the size of the swing angle can be adjusted.

When the lead frame (24) shown in FIG. 1 is heated by the heater (37) in the heater block (22), the temperature is set to room temperature or higher, and when the foil (2) is a solder foil, it is heated to 200. It is heated strongly and melts when placed on the lead frame (24), so if a semiconductor chip is mounted from above in this state, the semiconductor chip is fixed to the lead frame.

(G) Effect of the Invention As described above, the present invention is a chuck in which the notch foil is bitten while the lower end of the cutter forms a notch in the lead frame through the night by the sharp edge portion of the cutter when cutting the foil. Is to cut the foil into a predetermined length by pulling it back while holding the foil, and pasting the cut foil onto the lead frame.

Therefore, even if the meltability of the foil on the lead frame is poor, the cut side edge of the foil is bite into the notch of the lead frame, so that the foil does not peel off from the lead frame and stable bonding is performed. You can

Further, since the chuck pulls the foil in a state where the edge portion of the cutter presses the cutting side end portion to the lead frame, the foil can be surely cut to a predetermined length and can be attached onto the lead frame.

[Brief description of drawings]

FIG. 1 is a front view of a foil feeding device and a foil sticking device, FIG. 2 is an operation explanatory view of the foil feeding device, FIG. 3 is a diagram showing a cutter,
FIG. 4 shows explanatory views of the operation of the cutter, respectively. Explanation of main drawing numbers (1) …… Foil spool, (2) …… Foil, (8) …… First chuck, (10) …… Second chuck, (13) …… Cutter, (24 )
…… Lead frame, (35) …… Edge part.

Claims (1)

[Claims] 1. A foil sticking device in which an end portion of a foil of a band-shaped body sent by a foil sending device is cut and the cut foil is stuck onto a heated lead frame.
A cutter that can move up and down with its lower end having an acute-angled edge so as to form a notch in the lead frame by passing the foil through the cut-side end of the foil sent out on the lead frame for a predetermined length; When moving, it holds the foil from the spool and sends it out onto the lead frame, and when it moves back, it pulls it while holding the foil in the state of being cut into the notch formed in the lead frame by the edge of the cutter that has moved downward. A foil sticking device provided with a reciprocating chuck that cuts at a side end.