JPH0128685Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a semiconductor pellet positioning device used in a semiconductor pellet mounting device or the like.

Conventional technology When mounting semiconductor pellets (hereinafter referred to as pellets) on a lead frame, heat sink, hybrid IC board, etc., one pellet is taken out from a group of pellets at a predetermined position using a vacuum suction collet and placed on a relay stage dedicated to positioning. After feeding and precisely positioning the pellets on the transfer stage,
It is common practice to adsorb these pellets with the same or different collets and supply them to a lead frame or the like. Pellet positioning on the above-mentioned relay stage is usually done by using a plurality of claws to push the four sides of the pellet supplied onto the stage, taking advantage of the rectangular shape of the pellet. This will be explained next with reference to FIGS. 5 and 6.

In Figures 5 and 6, 1 is a pellet, 2 is a pellet.
is a pellet positioning stage, which is fixed horizontally in a fixed position. Numerals 3a to 3d are four pellet positioning pawls that are slidably installed at 90° intervals on the flat upper surface of the stage 2, and 4 is a pawl drive unit that simultaneously drives the pawls 3a to 3d. 4 claws 3a-3d
are located at the same distance from the center of the top surface of the stage 2, and if the two orthogonal directions of the four sides of the pellet 1 positioned on the stage 2 are the X and Y directions, the two opposing claws 3a and 3c are in the X direction. , the remaining two opposing claws 3b and 3d extend in the Y direction. The pawl driving section 4 has four levers 5, 5... extending from the rear end of each pawl 3a to 3d to a lower end 5' which is pivotally connected, and an intermediate portion of each lever 5, 5... which is rotatably pivoted. supporting shafts 6, 6... and rollers 7, 7... rotatably attached to the lower ends of the respective levers 5, 5...;
It has an elevating rod 9 having a conical head 8 that is in constant pressure contact with the elevating rod 7, and a vertical drive source 10 such as a cylinder that moves the elevating rod 9 up and down.

1 pellet 1 in the center of the top of stage 2
When this is supplied, the lifting rod 9 rises and simultaneously rotates the four levers 5, 5, etc. around the support shafts 6, 6, etc. as shown by the chain lines in the drawing.
The four claws 3a to 3d simultaneously begin to move toward the center of the stage, and the four sides of the pellet 1 are pushed by the tips of the claws 3a to 3d, so that the pellet 1 is positioned on the center of the stage 2. When this pellet positioning is completed, the lifting rod 9 is lowered, and the claws 3a to 3d are separated from the pellet 1 and returned to their original positions.

Problems to be Solved by the Invention In such a device that uses claws to position pellets on a stage, it is necessary to use claws that correspond to the pellet size. That is, in the above pellet positioning device, when the size of the pellet 1 is changed to a smaller size, when the four claws 3a to 3d are moved forward together for pellet positioning, the tips of the claws 3a to 3d interfere with each other. The four sides of the changed small pellet may no longer be in contact with each other, making it impossible to position the pellet. On the other hand, if the size of the pellet 1 is changed significantly, the tips of the claws 3a to 3d will be too small for the four sides of the large pellet, and accurate pellet positioning cannot be expected. Therefore, when changing the pellet size, prepare a claw of an appropriate size according to the pellet size.
Although the claws are replaced with new ones in accordance with the change, the work of replacing the claws requires a large amount of man-hours and reduces the operating rate of the pellet mount device.

Also, each pawl 3a to 3d advances when the lifting rod 9 is pressed down and hits the pellet 1, so the lifting rod 9
If the nails 3a to 3d fall too quickly, the claws 3a to 3d will be forced onto pellet 1 with strong force, causing pellet 1 to fall.
There were cases where cracks and chips occurred.

Means for solving the problems This invention was made in view of the above problems.
a stage having a flat top surface to which semiconductor pellets are supplied; a pair of first and second wires stretched parallel to the stage in one direction via a spring material; 1. A pair of third and fourth wires stretched in a direction intersecting the first wire via a spring material, and a first wire that moves the first and second wires toward and away from each other on the stage.
The above-mentioned problems are solved by a pellet positioning device equipped with a wire drive means and a wire drive section having a second wire drive means for moving the third and fourth wires toward and away from each other.

Function In the present invention, the two sets of first and second wires and the third and fourth wires that cross each other on the stage are able to touch the four sides of the pellet on the stage by moving closer to each other. Since the pellets are positioned at the same time, if there is a change in pellet size, this change can be accommodated by simply changing the proximity setting of the first and second wires and the third and fourth wires. In addition, by tensioning each wire via a spring material,
Since the pellets are hit elastically and there is little impact, there is no chance of cracking or chipping of the pellets.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In FIGS. 1 to 3, reference numeral 11 indicates a horizontal stage arranged at a fixed position, and reference numerals 12 and 13 indicate a horizontal stage placed in a fixed position, and 12 and 13 are tensioned parallel to the flat upper surface of the stage 11 in the X direction at the water level via spring members 14 and 14. The first of the pair,
The second wires 15 and 16 are a pair of third and fourth wires stretched across the stage 11 in the Y direction perpendicular to the parallel X direction with spring members 17 and 17 interposed therebetween. Each wire 12, 13, 15, 16 is a hard wire such as a piano wire, and the wire diameter is 1/1/2 of the thickness of the pellet 1.
2 or less, and the first and second wires 12 and 13 and the third and fourth wires 15 and 16 are slidably crossed on the stage 11. Reference numeral 18 denotes a wire drive unit, which includes a first wire drive unit 18a that causes the first and second wires 12 and 13 to approach and separate from each other at the same speed, and a first wire drive unit 18a that causes the third and fourth wires 15 and 16 to approach and separate from each other at the same speed. It has a second wire driving means 18b for separating the wire.

The first wire drive section 18a has, for example, the following structure. 19 is a table fixed at a fixed position below the stage 11; 20 is a motor fixed on the table 19;
Reference numeral 1 denotes a threaded rod that is rotated in forward and reverse directions by a motor 20, and has screw threads of a fixed pitch in left and right opposite directions from the center. X in position above stand 19
placed in the direction. 22, 22 are guide rods arranged parallel to both sides of the threaded rod 21; 23, 24;
are a pair of U-shaped first and second wire support frames,
A threaded rod 21 is orthogonally screwed into the center of each of the wire support frames 23, 2, and guide rods 22, 22 are slidably inserted through the wire support frames 23, 2.
4 is held with its both sides hanging vertically near the two side surfaces of the stage 11 in the X direction. The first and second wire support frames 23 and 24 are screwed at equal distances on the left and right from the center of the threaded rod 21. Therefore, when the threaded rod 21 is rotated in one direction by the motor 20, the pair of wire support frames 23 and 24 The frames 23 and 24 approach or move away at the same speed while remaining parallel. These first and second wire support frames 2
Pulleys 25, 25, . The second wire 13 is stretched between the pulleys 25, 25. This first and second
The spring members 14, 14 that pull the wires 12, 13 are coil springs, and their tips are fixed to the first and second wire support frames 23, 24.

The second wire drive unit 18b has the same structure as the first wire drive unit 18b but is arranged with the direction changed by 90 degrees. A threaded rod 27 arranged in the Y direction that is rotated in the opposite direction, and a pair of guide rods 28, 28 fixed in parallel to both ends of the threaded rod 27.
and guide rods 28, 2 screwed onto the threaded rod 27.
8 and vertically supported third and fourth wire support frames 29 and 30. The third wire support frame 29 tensions the third wire 15 with pulleys 31, 31 attached to both sides thereof, and the fourth wire support frame 30 stretches the fourth wire 16 with pulleys 31, 31 attached to both ends thereof. Stretch it.

Next, the pellet positioning operation according to the above embodiment will be explained. First, the state shown in FIG. 1, that is, the first and second wires 12, 13 and the third and fourth wires 15, 1
One pellet 1 is fed onto the center of stage 11 when pellet 6 is at the outermost position sufficiently away from the center of stage 11. Then, each motor 20, 26 of the first and second wire driving means 18a, 18b
act together, the threaded rods 21 and 27 rotate forward, and the first and second wire support frames 23 and 24 and the third and fourth wire support frames 29 and 30 move toward each other. Then, the first and second wires 12 and 13 and the third and fourth wires 15 and 16 move forward on the stage 11 and contact and press the four sides of the pellet 1 in a manner that corresponds to the size of the pellet 1. Each wire 12, 13,
15, 16 move forward and stop, and at this stage the pellet 1 is attached to the four wires 12, 16 as shown in FIG.
The four sides are sandwiched between 13, 15, and 16 for positioning. At this time, each of the wires 12, 13, 15, 16 is stretched through spring members 14, 14, 17, 17, so that they elastically press against the pellet 1 and prevent the pellet 1 from cracking or chipping. There is no need to worry about doing so.

When this pellet positioning is completed, the motor 2
0, 26 to reversely rotate the threaded rods 21, 27. Then, each wire support frame 23, 24, 29, 30 retreats, and each wire 12, 13, 15, 16 retreats to its original position.

If the size of the pellets 1 supplied to the stage 11 is changed from large to small, this can be sufficiently coped with by determining the forward strokes of the wires 12, 13, 15, 16 in accordance with this change.

Incidentally, the present invention is not limited to the above-mentioned embodiment, and in particular, the wire drive section 18 can be changed to one using a cylinder as the drive source.

Effects of the invention According to the invention, even if there is a change in pellet size, it is possible to cope with the change in pellet size without changing any parts, thereby improving the operating rate of the pellet positioning device. Also, pellet 4
Since the pellets are positioned by applying wires stretched to the sides via spring materials, there is no fear of cracking or chipping of the pellets, and a safe and highly reliable product can be provided.

[Brief explanation of drawings]

FIG. 1 is a plan view of a semiconductor pellet positioning device showing an embodiment of the present invention, and FIG.
A cross-sectional view of the positioning device along line A, FIG.
FIG. 4 is a sectional view of the positioning device taken along line B--B in the figure, and FIG. 4 is a plan view of the device of FIG. 1 during pellet positioning operation. FIG. 5 is a plan view of a conventional pellet positioning device, and FIG. 6 is a cross-sectional view of the device shown in FIG. 5 taken along line C--C. 1... Semiconductor pellet, 11... Stage, 1
2...first wire, 13...second wire, 14,
14... Spring material, 15... Third wire, 16...
4th wire, 17, 17... spring material, 18... wire drive section, 18a... first wire drive means,
18b...Second wire driving means.

Claims (1)

[Scope of utility model registration request] A stage having a flat top surface to which semiconductor pellets are supplied, and a pair of first and second stages stretched parallel to each other in one direction on this stage with a spring material interposed therebetween.
a pair of third and fourth wires stretched across the first and second wires in parallel on the stage, and first and second wires on the stage; 1. A semiconductor pellet positioning device comprising: a wire driving section having a first wire driving means for moving the third and fourth wires toward and away from each other; and a second wire driving means for moving the third and fourth wires toward and away from each other.