JPH0667499B2 - Bonding material coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention makes it possible to apply a bonding material to a pellet mounting position when the pellet is mounted on a pellet mounting position of a substrate such as a lead frame on which the pellet is mounted. And a bonding material applying device.

[Prior Art] In the process of manufacturing ICs, LSIs, etc., there is a step of mounting pellets at each pellet mounting position of a long lead frame [substrate]. In this step, the pellet mounting positions of the conveyed lead frame are sequentially stopped at the pellet mounting work position, and the pellets supplied in the stopped state are joined to the pellet mounting position. At this time, the joining material is applied in advance by the joining material application device to the pellet mounting position where the pellets are joined. The bonding material coating device is arranged in a preceding step for the pellet bonding work position in the lead frame transport line. The bonding material coating device sequentially stops each pellet mounting position of the conveyed lead frame at the bonding material coating position, and at this position, bonding material such as epoxy-based bonding agent and conductive silver paste can be coated at the pellet mounting position. There is. The application of the bonding material is performed, for example, by a coating nozzle described in Japanese Patent Laid-Open No. 57-42134, and the coating nozzle can discharge an appropriate amount of the bonding material to a pellet mounting position where it is retained.

[Problems to be Solved by the Invention] As described above, conventionally, the application of the bonding material to the pellet mounting position is performed by positioning each pellet mounting position to the bonding material coating position where the coating nozzle is fixedly arranged in order. . For this reason, it is necessary for the carrier that carries the lead frame to move the entire length of the long lead frame at a pitch to accurately position each mounting position at the bonding material coating position. However, when the whole of a relatively heavy carrier is moved by a pitch, there is a certain limit in the moving speed and the positioning accuracy of the carrier. Therefore, it has been considered that the productivity of electronic parts such as ICs and LSIs formed by mounting pellets has a certain limit.

An object of the present invention is to make it possible to apply a bonding material to each pellet mounting position on a substrate with a simple configuration and to improve the productivity of electronic components formed by mounting the pellet.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a bonding material coating device capable of coating a bonding material at a plurality of pellet device positions arranged on a substrate to be conveyed. A coating nozzle capable of coating the bonding material, a coating nozzle elevating means capable of moving up and down between a descending position and a rising position corresponding to the pellet mounting position of the substrate to be transported by the coating nozzle, and transported.
And a coating nozzle moving unit for moving the coating nozzle corresponding to a plurality of pellet mounting positions of the substrate held at a predetermined holding position, the coating nozzle moving unit rotating the rotating member and the rotating member. A pin member provided at a position eccentric from the center, a slide member supporting the application nozzle, and one end connected to the pin member, and the eccentric rotary motion of the pin member with respect to the rotation center of the rotary member is converted into a linear motion on the slide member. A transmission member for transmitting, a drive motor for rotating the rotating member, and a drive control unit for intermittently rotating the drive motor so as to repeatedly stop the rotating member at each of a plurality of predetermined positions within 11 rotations. It was made to become.

[Operation] According to the present invention, by operating the coating nozzle elevating means and the coating nozzle moving means, the relatively lightweight coating nozzle is sequentially moved to and lowered to each pellet mounting position of the substrate positioned at a predetermined stop position. Is possible. This allows
It becomes possible to continuously apply the bonding material to each pellet mounting position. With a simple structure, it is possible to apply the bonding material to each pellet mounting position of the substrate, and an electronic component formed by mounting the pellet. It is possible to improve the productivity of.

In the present invention, a mechanism (crank mechanism) in which a pin member eccentrically provided on the rotating member and a slide body supporting the coating nozzle are connected by a transmission member is used as the coating nozzle moving means. Then, the control unit of the drive motor that rotates the rotating member only needs to intermittently rotate the drive motor so as to repeatedly stop the rotating member at each of a plurality of predetermined positions within one rotation. Therefore, the control unit of the drive motor does not need to be equipped with a microprocessor such as a microprocessor that calculates the nozzle position based on new pellet mounting position information each time the application operation of the bonding material by the application nozzle is repeated. Can be simplified.

Further, in the present invention, by making it possible to adjust the amount of eccentricity from the rotation center of the rotating member to the pin member, when the interval between the plurality of pellet mounting positions is changed by changing the type of substrate, the movement stop position of the coating nozzle is changed. Can be easily adapted to the change of the interval.

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

FIG. 1 is a side view showing a bonding material coating device according to an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a III-III of FIG.
It is sectional drawing which follows the line.

The bonding material coating device 10 is arranged at a lateral position of the lead frame carrying line 11 arranged in the X direction. This device 10
Enables the bonding material to be applied to each pellet mounting position of the long lead frame 12 [substrate] that is transported along the transport line 11. The lead frame 12 coated with the bonding material at the pellet mounting position is transported in the direction of arrow A along the transport line 11, and then the pellet mounting device 13 mounts the pellet at the pellet mounting position.

A carrier that can carry the lead frame 12 in the direction of arrow A
Numeral 14 is arranged in the X direction and is capable of pitch conveyance while holding the lead frame 12. The lead frame 12 to be conveyed is a dual lead frame having two pellet mounting positions 15A and 15B in the width direction [Y direction], and the interval between the pellet mounting positions 15A and 15B continuous in the X direction is set to a predetermined value. The pitch is P. As a result, the carrier 14 moves to the pellet mounting position 15 in the X direction.
A and 15B are sequentially placed on the transfer line 11 at the bonding material application position 16
The lead frame 12 can be intermittently conveyed at the pitch P so as to be positioned at.

The bonding material coating device 10 includes a bonding material coating nozzle 17 above the carrier 14. The coating nozzle 17 is slidable in the arrow Y direction with respect to the pedestal 18, and is vertically movable [Z direction]. The coating nozzle 7 is supported by a nozzle support 19 as shown in FIG. 1, and the nozzle support 19 is supported so as to be able to move up and down in the vertical direction [Z direction] with respect to the receiving portion 20. The receiving portion 20 is fixed to a U-shaped holding body 21 as shown in FIG. 1, and the holding body 21 is fixed to an upper portion of a horizontal slide body 22. An elevating motor 23 as a coating nozzle elevating means is fixed to the holder 21.
An eccentric cam 25 is mounted on the drive shaft 24 of the motor 23,
A cam follower 26 is brought into contact with the cam surface of 25. The cam follower 26 is attached to one end of the elevating shaft 27, and the other end of the elevating shaft 27 is fixed to the nozzle support 19. The elevating shaft 27 arranged in the Y direction shown by the arrow is formed in the receiving portion 20 and the holding body 21, and is fitted into a long hole 28 formed in the vertical direction.
As a result, when the cam 25 is rotated by the drive of the motor 23, the elevating shaft 27 is vertically moved along the elongated hole 28, whereby the lower end of the coating nozzle 17 is moved to the lower end position 29 and the upper end position. It will be moved up and down between 30.

On the other hand, the horizontal slide body 22 is slidably supported in the Y direction shown by the arrow with respect to the rail portion 31 disposed on the upper part of the gantry 18. Further, a motor bracket 32 is supported on the gantry 18, and a sliding motor 33 as an application nozzle moving means is fixed to the motor bracket 32. A disc-shaped crank 35 is attached to a drive shaft 34 of the motor 33. At the peripheral position with respect to the center O of the crank 35,
A screw supporting portion 36 is provided, and an adjusting screw 37 that is screw-adjusted in the arrow B direction is supported on the screw supporting portion 36. The screw portion 38 of the adjusting screw 37 is extended to the center O side of the crank 35, and the screw portion 38 is screwed with a movable plate 39 provided on the upper surface of the crank 35 at a peripheral position opposite to the screw support portion 36. . A crank pin 40 is attached to the movable plate 39, and the crank pin 40
One end of a connecting rod 41 is connected to. On the other hand, connecting rod
The other end of 41 is a connecting pin provided on the horizontal slide body 22.
Connected with 42. As a result, the connecting rod 41 moves to the crank 35.
The eccentric rotational movement of the crank pin 40 with respect to the rotation center of the is transmitted to the horizontal slide body 22 as a linear movement. Movable plate 39
The crank 35 by adjusting the adjusting screw 37.
The distance between the center O of the crank 35 and the crank pin 40 can be adjusted by sliding in a guide groove engraved in the. The space between the center O and the crank pin 40 is the lead frame
Two pellet mounting positions 15 arranged in the Y direction of arrow 12
It is adjusted to half [W / 2] of the interval W between A and 15B, and the adjustment is performed by screwing the adjusting screw 37 as described above. In this way, the crank 35 in which the position of the crank pin 40 is adjusted is rotated in the arrow C direction by driving the motor 33, and one end of the connecting rod 41 is also rotated in the arrow C direction. Along with this, the horizontal slide body 22
Will be reciprocated in the Y direction indicated by the arrow, and as a result, the coating nozzle 17 located above the bonding material covering position 16 will move to that position.
The pellets are reciprocated between the two pellet mounting positions 15A and 15B. A disc 43 is attached to the drive shaft 34 below the crank 35. A display unit 44 is provided at a peripheral position of the disc 43. The display portion 44 is rotated at the crank 35, and the application nozzle 17 is moved to the forward end position [pellet mounting position 15A shown in FIG. 1] with respect to the transport body 14 in a rotating position 45 shown in FIG. Be positioned at. On the other hand, the display unit 44 is rotated at the rotation position shown in FIG. 3 in a state where the crank 35 is rotated and the application nozzle 17 is moved to the backward end position [pellet mounting position 15B shown in FIG. 1] with respect to the transport body 14. Positioned at 46. Therefore, a sensor unit 47 for sensing the display unit 44 is provided at each of the turning positions 45, 46, and the sensor unit 47 outputs the sensing state of the display unit 44 to the drive control unit of the slide motor 33. It is possible. Then, the drive control unit is configured to repeatedly stop the crank 35 at each of two positions defined within one rotation.
Rotate 33 intermittently. That is, the motor 33 has a display unit 44.
The drive is controlled in a state in which each of the sensor units 47 is positioned, and the coating nozzle 17 can be stopped above the pellet mounting positions 15A and 15B.

The operation of the bonding material coating device 10 thus formed is
This is done as follows. First, the slide motor 33 is driven in a state where the pellet mounting positions 15A and 15B of the lead frame 12 conveyed in the direction of the arrow A are positioned at the bonding material application position 16, whereby the horizontal slide body 22 is moved.
It is driven forward with respect to 14. Along with this, the coating nozzle 17
When is moved to above the pellet mounting position 15A and positioned, the driving of the motor 33 is stopped. In this state, the coating nozzle 17 positioned at the rising end position 30 is moved to the descending end position 29 by driving the lifting motor 23. nozzle
When the descent of 17 reaches the descent end position 29, a predetermined amount of the bonding material is ejected from the nozzle 17 toward the pellet mounting position 15A. Epoxy-based bonding agent, conductive silver paste, cream solder, and the like are used as the bonding material to be discharged. When a predetermined amount of bonding material is applied to the pellet mounting position 15A, the nozzle 17
Is raised to the rising end position 30 by driving the re-elevating motor 23.

When the bonding material is applied to one pellet mounting position 15A in this way, the slide motor 33 is driven, and the horizontal slide body 22 is driven backward with respect to the transport body 14. Along with this, the coating nozzle 17 is moved above the pellet mounting position 15B, and when positioned, the drive of the motor 33 is stopped. In this state, the coating nozzle 17 positioned at the rising end position 30 is moved to the descending end position 29 by driving the motor 23. When the lower end of the nozzle 17 reaches the descending end position 29, a predetermined amount of the bonding material is discharged from the nozzle 17 toward the pellet mounting position 15B. Predetermined amount of bonding material is at pellet mounting position 15
When it is applied to B, the nozzle 17 is again moved to the rising end position 30 by driving the lifting motor 23.

In this way, when the bonding material is applied to the two pellet mounting positions 15A and 15B arranged in parallel in the Y direction, the lead frame
12 is pitch-driven in the direction of arrow A by the carrier 14, and two pellet mounting positions 15A and 15B for applying the bonding material next are positioned at the bonding material applying position 16.
As described above, the bonding material applying device 10 sequentially applies the bonding material applying positions.
Two pellet mounting positions transported to and positioned at 16
A bonding material can be applied to each of 15A and 15B.

The lead frame 12 with the bonding material applied to the pellet mounting positions 15A and 15B is transferred to the pellet bonding work position 48 of the lead frame transfer line 11 and is stopped there. The pellet joining work position 48 is separated from the joining material application position 16 by 4 pitches in the X direction, and the pellet mounting device 13 is disposed on the side of the pellet joining work position 48. The pellet mounting device 13 includes a swing arm 50 on a moving base 49, and a pellet mounting portion 51 is arranged at a tip end portion of the swing arm 50. The swing arm 50 is swingable in the direction of the arrow D around the base end portion 52, and two pellet mounting positions 15A positioned at a pellet supply position 54 of the pellet transfer conveyor 53 and a pellet joining work position 48. , 15B, it can reciprocate between it and the pellet mounting position 15A. The pellet mounting portion 51 at the tip of the arm 50 holds the pellet 55 supplied while being swung at the pellet supply position 54, and pellets at the position 15A while being swung at the pellet mounting position 15A.
55 can be installed. Pellet mounting position 15A
The pellet mounting portion 51 which is swung up and down is reciprocally movable between the two pellet mounting positions 15A and 15B in the arrow Y direction, and the reciprocation is performed by driving the moving base 49 in the arrow Y direction. . As a result, the pellet mounting unit 51 holds the pellet 55 that is fed to the pellet supply position 54 in a swinging state, and further swings to the pellet mounting position 15A and slides to the pellet mounting position 15B. The pellet 55 can be attached to the position 15B. In this way, the pellet mounting device 13 is sequentially positioned at the pellet bonding work position 48, and the two pellet mounting positions to which the bonding material is applied.
The pellet 55 supplied to 15A and 15B can be mounted.

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

According to the bonding material coating device 10 according to the above-described embodiment, by driving the lifting motor 23 as the coating nozzle lifting means and the sliding motor 33 as the coating nozzle moving means, the bonding material is transported to the bonding material coating position 16 and positioned. Lead frame
It is possible to move and lower the coating nozzle 17, which is relatively lighter than the carrier 14, to the two pellet mounting positions 15A and 15B of 12 in comparison. This allows two pellet mounting positions 15
It becomes possible to continuously apply the bonding material to A and 15B. With a simple structure, the bonding material is applied to each pellet mounting position 15A, 15B of the lead frame 12 and the pellet 55 is mounted and formed. It is possible to improve the productivity of electronic components used. Further, as the application nozzle moving means, a mechanism (crank mechanism) in which a crank pin 40 eccentrically provided on the crank 35 and a horizontal slide body 22 supporting the application nozzle 17 are connected by a connecting rod 41 is used. .
Then, the control unit of the sliding motor 33 that rotates the crank 35 only needs to intermittently rotate the motor 33 so as to repeatedly stop the crank 35 at each of two predetermined positions within one rotation. Therefore, the control unit of the motor 33, each time the application of the bonding material by the application nozzle 17 is repeated,
It is not necessary to provide a device such as a microphone processor that calculates the nozzle position based on new pellet mounting position information, and the mounting configuration can be simplified. Further, the bonding material application device 10 according to the above-described embodiment includes two pellet mounting devices 115A,
Various types of lead frame 12 with different spacing W between 15B 12
Even in this case, it is possible to easily cope with this by adjusting the screw of the adjusting screw 37.

[Advantages of the Invention] As described above, according to the present invention, the bonding material can be applied to each pellet mounting position on the substrate with a simple structure, and the productivity of electronic components formed by mounting the pellets can be improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing a bonding material coating device according to an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a III-III of FIG.
It is sectional drawing which follows the line. 10, 60 …… Bonding material coating device, 12,61 …… Lead frame [board], 15A, 15B, 62A, 62B …… Pellet mounting position,
17 …… Bonding material application nozzle, 22 …… Horizontal slide body, 23…
… Elevating motor [coating nozzle raising and lowering means], 29… descending end position, 30… rising end position, 33… sliding motor [application nozzle moving means], 35… crank (rotating member), 37
...... Adjusting screw, 39 ...... Movable plate, 40 ...... Crank pin (pin member), 41 ...... Connecting rod (transmission member).

Claims (2)

[Claims] 1. A bonding material coating device capable of applying a bonding material to a plurality of pellet mounting positions arranged on a substrate to be transported, wherein a coating nozzle capable of coating the bonding material and the coating nozzle are transported. Corresponding to a plurality of pellet mounting positions of a substrate that is conveyed and stopped at a predetermined stopping position, and a coating nozzle elevating means that can move up and down between a descending position and a rising position corresponding to the pellet mounting position of the substrate. Coating nozzle moving means for moving the coating nozzle, and the coating nozzle moving means supports the rotating member, the pin member provided at a position eccentric from the rotation center of the rotating member, and the coating nozzle. A slide member, one end of which is connected to the pin member, and a transmission member which transmits the eccentric rotation movement of the pin member with respect to the rotation center of the rotation member as a linear movement to the slide body,
It has a drive motor for rotating the rotary member, and a drive control unit for intermittently rotating the drive motor so as to repeatedly stop the rotary member at each of a plurality of predetermined positions within one rotation. Bonding material application device. 2. The bonding material coating device according to claim 1, wherein the amount of eccentricity from the center of rotation of the rotating member to the pin member is adjustable.