JPH0779111B2 - Pellet mounting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pellet mounting apparatus capable of mounting a chip such as an IC or an LSI on each pellet mounting portion of a substrate such as a lead frame.

[Prior Art] A lead frame having a fixed length and a plurality of pellet mounting portions arranged in the longitudinal direction at a predetermined pitch P is disclosed in, for example, Japanese Patent Laid-Open No. 59-55026. It is conveyed along the longitudinal direction by the conveying means of the frame.
That is, the lead frame is carried by the carrying means in a state of being fed and moved in a predetermined direction while being guided by the guide portion. At this time, the lead frame is conveyed at a pitch P so that the pellet mounting portions of the lead frame are sequentially stopped at the pellet mounting work position in the conveying process.

Pellet mounting is carried out by operating the pellet mounting body described in JP-A-58-96739, for example, for each of the pellet mounting portions that are stopped at the pellet mounting work position.
This pellet mounting body is mounted between the pellet supply position and the pellet mounting work position so that the pellets supplied and positioned at the pellet supply position are mounted on the pellet mounting portion of the lead frame positioned at the pellet mounting work position. It is designed to reciprocate and move up and down at the moving end. A motor as a moving means is generally used for the reciprocating movement and the vertical movement of the pellet mounting body, and the reciprocating rotational driving force of the motor is converted into an operating force in the moving direction of the mounting body.

[Problems to be Solved by the Invention] However, according to the above-described pellet mounting device, in order to mount pellets on the pellet mounting portion sequentially positioned at the pellet mounting position quickly and smoothly, one pitch of the lead frame is used. The feeding time and the round trip movement time of the pellet mounting body or the sum of this time and the vertical movement time were set to be the corresponding time. That is, the pellet mounting body is set so as to be continuously moved corresponding to the feed time of one pitch of the lead frame without stopping during pellet transportation. This is because if the pellet mounting body is stopped during transportation, vibration or shock will occur, and unreasonable force will be applied to the pellet mounting device, or the pellet during transportation will fall apart from the pellet mounting body. Because there is a nature. Therefore, in the case of various types of lead frames in which the intervals between the pellet mounting parts are different and the feed time for one pitch is different, either increase the lead frame feed speed or reciprocate the pellet mount body each time. The travel time or the vertical travel time was added to adjust the time. However, in the former case, if the feed speed is too fast, slippage occurs between the lead frame and this conveying means, and it is difficult to accurately position the pellet mounting portion at the pellet mounting work position. In the latter case, the reciprocating movement time and the vertical movement time are adjusted by changing the speed reducer interposed between the motor as the moving means and the pellet mounting body to one corresponding to each pitch feed time. For this reason, it has not been possible to quickly respond to changing the lead frame type.

According to the present invention, even if the feed time of one pitch of the substrate is changed by changing the type of the substrate, the pellet mounting body is continuously moved without being stopped during the transportation of the pellet, and therefore, is moved without vibration or impact. This can be achieved quickly, and thereby the operating rate of the pellet mounting device can be improved.

[Means for Solving the Problem] According to the present invention, each pellet mounting portion of a substrate in which a plurality of pellet mounting portions are arranged at a predetermined pitch P in the longitudinal direction,
Substrate transporting means for feeding and moving the substrates in the transport direction at a pitch P so as to be sequentially positioned at the pellet mounting work position, and the pellets supplied and positioned at the pellet supply position are positioned at the pellet mounting work position. In a pellet mounting apparatus having a pellet mounting body that reciprocates between a pellet supply position and a pellet mounting work position so that the substrate is mounted on a pellet mounting portion of the substrate, the substrate transfer means for transferring the substrate A pellet mounting body capable of adjusting the time required for one reciprocating cycle of the pellet mounting body according to one pitch feeding time of the substrate so that the operation of the pellet mounting body does not stop during the pitch feeding time. It has a moving speed adjusting unit.

[Operation] According to the present invention, when the feed time of one pitch of the substrate such as the lead frame changes, the time required for one reciprocating movement cycle of the pellet mounting body by the movement speed adjusting unit corresponding to the change. It can be adjusted according to a predetermined feed time of one pitch. As a result, each time the feeding time of one pitch of the substrate is different as in the conventional case, the pellet mounting body is not continuously stopped without being replaced with a corresponding speed reducer, and therefore, the vibrations and Moving without impact can be achieved quickly. Therefore, it is possible to promptly respond to the change of the type of the substrate as compared with the conventional one, and thereby to improve the operation rate of the pellet mounting device.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing a pellet mounting device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 1, showing a moving state of a mounting nozzle as a pellet mounting body, 3 (A) and 3 (B) are diagrams showing an example of speed adjustment by the moving speed adjusting unit.

The pellet mounting device 10 includes a pair of guide rails 11A and 11B as guide portions in the X direction of the arrow. The lead frame 12 having a constant width and a constant length can be conveyed in the direction of arrow A on the pair of guide rails 11A and 11B. That is, the lead frame 12 can be transported in the direction of the arrow A on the transport line Q with the longitudinal direction being the X direction, and the guide rails 11A and 11B are transported by the Y of the lead frame 12 to be transported.
Each end in the direction can be held.

In the longitudinal direction [X direction] of the lead frame 12, pellet mounting portions 13 are arranged with a predetermined pitch P. A pellet mounting operation position 14 is provided at a predetermined position of the lead frame 12 on the transport line Q. At the pellet mounting work position 14, the pellet mounting portion 13 of the lead frame 12 transported in the direction of arrow A can be sequentially stopped. At each position 14, pellets are attached to the pellet mounting unit 13 that is sequentially stopped.
15 pieces will be worn.

Transport of the lead frame 12 in the direction of arrow A is indicated by arrow B.
This is performed by the transport roller 16 which is rotationally driven in the direction. That is, the transport roller 16 is rotated in contact with the lead frame 12 held by the guide rails 11A and 11B, and the lead frame 12 can be fed and moved along the transport line Q. The transport roller 16 is rotationally driven by rotating a support shaft 17 supporting the roller 16 in the direction of arrow B, and the support shaft 17 is connected to a driving shaft of a transport motor 18. As a result,
By driving the motor 18, the carrying roller 16 is rotationally driven, which allows the lead frame 12 to be carried in the direction of arrow A.

The lead frame 12 is transported by the pellet mounting parts 13 arranged at a predetermined pitch P in the transport direction [direction A].
Are sequentially stopped at the pellet mounting work position 14. Therefore, the roller 16 is intermittently rotated in the direction of arrow B, and the intermittent rotation is performed by intermittently driving the carry motor 18. That is, the roller 16 is
The intermittent rotation amount can be adjusted in accordance with the interval P between the adjacent pellet mounting portions 13 that are different depending on the type of the lead frame 12, and the adjustment is performed by the conveyance motor drive adjustment unit 19 that adjusts the drive amount of the conveyance motor 18. It is done by doing.

On the other hand, the pellets 15 mounted in the stationary pellet mounting portion 13 are formed by breaking and breaking a substantially circular wafer 20 as shown in FIG. Mounted pellet 15 is XY
The table 21 is arranged in rows and columns in the XY direction on the upper surface of the table 21. XY table 21 for aligning and holding multiple pellets 15
Is arranged beside the transport line Q, and the table 21 can be driven in the XY directions in the plane. Each pellet to be aligned 15
Is a sequential table by driving the XY table 21 in the XY direction.
It is stopped and positioned at the pellet extraction work position 22 on the 21. Further, the pellets 15 which are sequentially positioned at the pellet extracting work position 22 are held by the transfer collet 23 and transferred to the pellet adjusting work position 24 by the collet 23. The transfer collet 23 is attached to the tip of a swing arm 25, and the arm 25 can swing back and forth in the arrow C direction around the base end. That is, the transfer collet 23 can be reciprocally moved between the pellet extracting work position 22 and the pellet adjusting work position 24 through the swing of the swing arm 25, whereby the collet 23 is sequentially removed. Pellets positioned on
15 can be held and transferred to the adjustment work position 24 and released.

The pellet adjusting work position 24 is located on the upper surface of the adjusting table 26 on the side of the transfer line Q. The pellets 15 transferred by the transfer collet 23 are released on the table 26. The adjustment work position 24 on the table 26 is opposed to the pellet mounting work position 14 in the Y direction. Four pellet adjusting claws 27 are provided on the periphery of the adjusting work position 24, and each pellet adjusting claw 27 is moved forward and backward in the direction of arrow D with respect to the pellet 15 released to the adjusting work position 24. Made possible. Each pellet adjusting claw 27 is released and positioned at the adjusting position 24 of the table 26 by being driven forward to the adjusting position 24.
Can be adjusted to a predetermined adjustment angle state.

The pellets 15 adjusted to a predetermined adjustment angle are mounted on the pellet mounting portion 13 which is sequentially positioned at the pellet mounting work position 14 by the mounting collet 28 as a pellet mounting body. The mounting collet 28 is attached to the tip of the slide arm 29, and the slide arm 29 is slidable in the Y direction with respect to the base 30. That is, the slide arm 29
Of the mounting collet 28 by the rotational driving of the sliding motor 31.
Is reciprocated between the pellet adjusting work position 24 and the pellet mounting work position 14. Wearing collet 28
Can be moved up and down with respect to the tip of the slide arm 29 by driving an elevating means (not shown) [see FIG. 2]. When the slide arm 29 is moved to the upper side of the adjusting table 26 as shown by the solid line in FIG. 2, the mounting collet 28 positioned at the rising end position 32 is moved down to the descending end position 33. In this state, the mounting collet 28 sucks and holds the pellets 15 that are adjusted and positioned at the pellet adjusting work position 24, and is moved up to the rising end position 32 again. The pellet 15 held by the mounting collet 28 is moved to the pellet mounting work position by sliding the slide arm 29 toward the transfer line Q side.
It corresponds to 14 and is positioned [see the chain double-dashed line in Figure 2].
At the pellet mounting operation position 14, the mounting collet 28 located at the rising end position 32 is lowered to the descending end position 33 by driving the elevating means. The pellet 15 held by the lowered collet 28 is mounted in contact with the pellet mounting portion 13 positioned at the pellet mounting work position 14. That is, the pellet mounting portion 13 is coated with the bonding material in advance, and the lowered pellets 15 are mounted on the pellet mounting portion 13 via the bonding material coated on the mounting portion 13. Above the pellet loading work position 14, press the frame
34 is provided. The frame retainer 34 is moved down from the ascending position 35 shown by the chain double-dashed line when the pellet 15 is mounted on the stationary pellet mounting portion 13. As a result, as shown by the solid line in FIG. 2, it becomes possible to hold the lead frame 12 that is stopped against the pair of guide rails 11A and 11B, and when the pellet 15 is attached to the attaching portion 13, It is possible to hold the frame 12 in a fixed state.

Pellet loading section 13 parked at pellet loading position 14
When the pellets 15 are mounted on the mounting collet 28, the mounting collet 28 is moved up to the rising end position 32. Next, the collet 28 is moved to the pellet adjusting work position 24 side again, and is supplied to the adjusting work position 24 so that the pellets 15 to be adjusted can be held. In this way, the lead frame 12 including the plurality of pellet mounting portions 13 in the transport direction [A direction] is sequentially moved by the reciprocating movement of the mounting collet 28 between the pellet adjusting work position 24 and the pellet mounting work position 14. The pellets 15 are mounted on the pellet mounting portions 13 that are stopped.

As described above, the mounting collet 28, which is periodically moved in the order of the pellet adjusting work position 24, the pellet mounting work position 14 and the pellet adjusting work position 24, is the second one in one reciprocating cycle S1. Ascending or descending is repeated in the order shown in FIG. Of these, the area D1 is the time area required to move the mounting collet 28 from the pellet adjusting work position 24 to the pellet mounting work position 14, and the area D2 is the pellet mounting work position 14 of the mounting collet 28. To the pellet adjusting work position 24 is a time region required.

In addition, the lead frame 12 in which the pellet mounting portions 13 are arranged with a predetermined pitch P in the longitudinal direction [X direction] is the second
As shown in (B) of the figure, pitch conveyance is performed between the time regions T. The pitch transfer is performed by the pellet mounting unit 13 in the previous process.
The process is started after the pellets 15 are mounted on the pellets 15, and is finished before the next pellets 15 to be mounted are positioned at the pellet mounting work position 14. As a result, the pellet mounting portion 13 on which the pellets 15 should be mounted is sequentially positioned at the pellet mounting position 14. Lead frame
Of the 12 pitch transport time regions T, T1 is an acceleration time region, T2 is a constant speed feed time region, and T3 is a deceleration time region. Of these, the feed speed in the constant-speed feed time region T2 is set to the maximum feed time of the carry motor 18 including a pulse motor.

Further, the frame presser 34 arranged above the pellet mounting work position 14 is moved up and down in the state shown in FIG. 2 (C), of which the time region E is the pressing time of the lead frame 12 by the frame presser 34. It is said that That is, due to this pressing work, the time when the frame presser 34 starts to descend is a stage before the pitch conveyance of the lead frame 12 is completed and the mounting collet 28 is moved down. Further, the time point at which the frame presser 34 that has completed the pressing work is started to rise is after the mounting collet 28 is moved to the rising end position 32.

In this way, when the mounting collet 28 rises and falls and the frame retainer 34 rises and falls, the lead frame 12
Are set and restricted according to the timing of the conveyance state of. As a result, the pellet 15 by the mounting collet 28
The mounting work for the lead frame 12 is continuously performed while the lead frame 12 is being transported. At this time, if the pitch P between the pellet mounting portions 13 of the lead frame 12 is changed, the transport time T is inevitably changed. As a result, the timing of the rise and fall of the mounting collet 28 and the rise and fall of the frame retainer 34 are also adjusted according to the sequence of the timings set above. Among these, the movement state of the mounting collet that reciprocates between the pellet adjusting work position 24 and the pellet mounting work position 14 is the area D1 shown in FIG.
And by changing the moving speed at D2,
It is possible to deal with the change in the time domain T shown in. The movement speed of the mounting collet 28 is adjusted by adjusting the rotation speed of the sliding motor 31 as a stepping motor. The rotation speed is adjusted based on a command from the slide motor drive adjustment unit 36. That is, the motor drive adjusting unit 36 can adjust the rotation speed of the motor 31 according to the change in the time region T corresponding to the length of the pitch P.

Now, the number of rotations of the carry roller 16 required to carry the lead frame 12 corresponding to the length of the pitch P is calculated by the calculation unit 37 and set. That is, in the lead frame 12 that is transported along the transport line Q and the pellets 15 are mounted, the pitch P between the adjacent pellet mounting portions 13 of the lead frame 12 is the transport pitch before the transport. It is input to the setting input unit 38. The pitch P input to the input unit 38 is output to the calculation unit 37, and the calculation unit 37 determines the required number of rotations of the conveyance roller 16 based on the pitch P in relation to the feed amount of the conveyance roller 16 per time. Is calculated and output to the carry motor drive adjustment unit 19. Then, the adjusting section 19 gives the number of rotations based on the calculated value to the conveying roller 16.

In addition, the calculation unit 37 calculates the time region T required to carry the lead frame 12.

First, the input pitch P is configured by adding the feed amount P1 during acceleration, the feed amount P2 during constant speed, and the feed amount P3 during deceleration as shown in the equation (1). Among these, P1 is a constant speed, that is, the feed amount at the time of acceleration until the conveyance is performed at the maximum feed speed, and is always a constant value [see the equation (2)]. Further, P3 is also the feed amount during conveyance from the maximum feed speed until the conveyance is stopped, and is always a constant value [see equation (3)]. On the other hand, the constant speed feed amount P2 is expressed by the equations (4) and (5), and the time domain T2 corresponding to P2 is expressed by the equation (4). Equation (6) is obtained from these equations (4) and (5), and the pitch transport time region T of the lead frame 12 is further obtained as shown in equation (7). That is, in the calculation unit 37, each pitch P is substituted into the equation (7), and the transport time T corresponding to each lead frame 12 is calculated.

P = P1 + P2 + P3 (1) P2 = N × α × T2 (4) P2 = P- (P1 + P3) (5) Variable Here, N: the number of revolutions per second of the carry motor (constant) α; the feed amount of the carry motor per revolution (constant) T1; the acceleration time region (constant) T2; the constant speed time region T3; the deceleration time region (constant) P1; Feed amount during acceleration (constant) P1; Feed amount during constant speed P1; Feed amount during deceleration (constant).

When the pitch transport time T is calculated as described above, the computing unit 37 causes the mounting collet 28 corresponding to the transport time T to be calculated.
Calculate and set the moving speed of. First, the calculation unit 37 sets the time required for one reciprocating movement cycle S1 of the mounting collet 28 corresponding to the pitch transport time T obtained as described above. One movement cycle S1 of the now-installed collet 28
Is TM, and TS is the time from the start point F of the movement cycle S1 to the preceding step G of the descending start point of the mounting collet 28 with respect to the pellet mounting work position 14 [(A) and ((Fig. 2)). B)]. In addition, the calculation unit 37, in advance,
The relative ratio (TS / TM) of each of these values TS and TM is input as a constant setting reference value R. The reference value R is set by comparing the time during which the mounting collet 28 is continuously lowered and operated with respect to the pellet mounting portion 13 that is conveyed by the pitch and stays. The reference value R is, so to speak, pellet mounting. It is set as a design value that indicates the continuous operation relationship to each part of the device 10, and this device
In 10, the set reference value R is set to R = 0.666 [see the equation (8)]. Furthermore, the equations (9) and (10) are obtained from the preset reference value. That is, the calculation unit 37 can obtain the shortest time TM of the movement cycle S1 of the mounting collet 28 corresponding to each lead frame 12 by substituting the calculated T into the equation (10). Becomes Further required transfer cycle time
The moving times D1 and D2 of the mounting collet 28 between the pellet adjusting work position 24 and the pellet mounting position 14 corresponding to TM are (1
It is obtained by the equations (1) and (11 '). The moving speed of the mounting collet 28, that is, the moving speed V of the sliding motor 31 is calculated by the equation (12) with reference to the moving times D1 and D2 thus obtained.

Because it is TST D1 = TM × R-J (11) D2 = TM × (1-R) -J (11 ') J; Time required for vertical movement of the device collet L: Distance between pellet adjusting work position and pellet mounting work position When the pitch transport time T of the lead frame 12 is obtained as described above, the speed V of the sliding motor 31 is calculated accordingly. Then, the calculated value V is output to the drive adjusting unit 36 of the slide motor. The adjusting unit 36
In the above, the speed of the motor 31 is adjusted in the range of the time regions D1 and D2 based on the calculated value. This allows
The mounting collet 28 is moved back and forth following the lead frame 12 that is conveyed in the pitch.

Next, based on FIGS. 3A and 3B, a specific operation example of the present device 10 will be shown.

First, in the example shown in FIG.
The pitch P between the 12 adjacent pellet mounting portions 13 is 29 mm. In this case, the time T required for pitch conveyance is obtained as follows.

However, And

K3 = P1 + P3 = 1.5 + 2.5 = 4mm ∴K3 = 4mm When the value of T is obtained in this way, the time TM required for the movement cycle S1 of the mounting collet 28 is then obtained.
The movement cycle time TM is calculated by the calculation unit 37 as follows.

In other words, TM should be set to 0.496 seconds or more. Therefore, the transfer cycle time obtained in this way
The TM further adjusts the rotation speed of the slide motor 31 using the formulas (11), (11 ′), and (12), so that the pellet collation work position 24 of the mounting collet 28 and the pellet mounting work position 14 are adjusted. Will be adjusted to D1 and D2. As a result, as shown in FIG. 3A, the pellets 15 can be smoothly mounted by the mounting collet 28 after the lead frame 12 has been conveyed.

Next, in the example shown in FIG. 3B, the lead frame
The pitch P between the 12 adjacent pellet mounting portions 13 is set to 37.7 mm. In this case, the time required for pitch conveyance is calculated as follows.

In this way, when the value of T is obtained, the time TM required for the movement cycle S1 of the mounting collet 28 is next obtained.
The movement cycle time TM is calculated by the calculation unit 37 as follows.

In other words, TM should be set to 0.626 seconds or more. Therefore, the transfer cycle time obtained in this way
The TM further adjusts the rotation speed of the slide motor 31 using the formulas (11), (11 ′), and (12), so that the pellet collation work position 24 of the mounting collet 28 and the pellet mounting work position 14 are adjusted. Will be adjusted to D1 and D2. As a result, as shown in FIG. 3B, the pellets 15 can be smoothly mounted by the mounting collet 28 after the lead frame 12 has been conveyed.

Next, the operation of the above embodiment will be described.

According to the pellet mounting apparatus 10 according to the above-described embodiment, when the feed time T of one pitch of the lead frame 12 changes, the moving speed of the mounting collet 28 is moved by the arithmetic processing by the arithmetic unit 37 in response to the change. It becomes possible to adjust to the best value within the time TM required for the cycle S1. As a result, the slide motor 36 is rotated at a predetermined rotation speed within the set adjustment time D1 or D2 and follows the stationary state of the lead frame 12 pitch-conveyed and the mounting collet 28.
This makes it possible to mount the pellet 15 smoothly. As a result, it is not necessary to replace the lead frame 12 with a corresponding speed reducer each time the lead frame 12 has a different feed time T for one pitch as in the conventional case, and the lead frame 12 can be quickly changed in product type. Therefore, the operation rate of the pellet mounting device can be improved as compared with the conventional case. In addition,
In the above embodiment, the time D1 required for moving the mounting collet 28 between the pellet adjusting work position 24 and the pellet mounting work position 14 was adjusted, but this time and the vertical movement time of the mounting collet 28 were adjusted. TM calculated by adjusting (J) together or adjusting only vertical movement time (J)
May be supported. FIGS. 3A and 3B actually show this case.

[Effects of the Invention] As described above, according to the present invention, even if the feed time of one pitch of the substrate is changed by changing the type of the substrate, the pellet mounting body is always continuously operated without being stopped during the transportation of the pellet. ,
Therefore, it is possible to quickly achieve movement without vibration or impact. Therefore, it is possible to quickly respond to the change of the type of the substrate, and thus it is possible to improve the operation rate of the pellet mounting apparatus.

[Brief description of drawings]

FIG. 1 is a plan view showing a pellet mounting device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 1, showing a moving state of a mounting nozzle as a pellet mounting body, FIGS. 3A and 3B are diagrams showing examples of quick adjustment by the moving speed adjusting unit. 10 ... Pellet mounting device, 12 ... Lead frame, 13 ... Pellet mounting unit, 14 ... Pellet mounting work position, 15 ... Pellet, 16 ... Conveying roller, 18 ... Conveying motor, 19 ... Conveying motor drive adjusting unit, 24 ... Alignment work position, 28 ... Mounting collet [pellet mounting body], 31 ... Slide motor, 36 ...
Motor drive adjustment unit for slide [moving speed adjustment unit], 37 ...
Calculation unit, P ... Transport pitch, T ... Pitch transport time.

Claims (2)

[Claims] 1. A substrate is conveyed at a pitch P so that each pellet mounting part of a substrate having a plurality of pellet mounting parts arranged at a predetermined pitch P in the longitudinal direction is sequentially positioned at a pellet mounting work position. Pellet feeding position and pellet mounting work so that the board conveying means that moves in the direction and the pellets that are fed and positioned at the pellet feeding position are mounted on the pellet mounting portion of the substrate positioned at the pellet mounting operation position. In a pellet mounting apparatus having a pellet mounting body that reciprocates between positions, the operation of the pellet mounting body is prevented from stopping during one pitch feed time of the substrate by the substrate transfer means. A pellet mounting body capable of adjusting the time required for one reciprocating movement cycle of the pellet mounting body according to the one pitch feed time of the substrate Pellet mounting apparatus characterized by having a moving speed adjusting section. 2. The moving speed adjusting section of the pellet mounting body is capable of setting and adjusting the reciprocating moving speed between the pellet supplying position and the pellet mounting working position of the pellet mounting body. Item. The pellet mounting device according to item.