JPS5818286Y2 - Pellet positioning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positioning device that moves a semiconductor pellet by pushing it with a pusher claw and regulates its position in order to mount the semiconductor pellet.

Pellets conventionally used for semiconductor devices are obtained by selectively diffusing a wafer to form a large number of elements, and then dividing the wafer into individual elements in a scribing process.

This scribing process involves forming grooves on the wafer other than the elements with a scratching stick, and using the grooves as boundaries by bending and pulling the wafer.
A single wafer is divided into pellets as many as the number of devices.

However, the side cross-sectional shape of the divided pellets is
Ideally, it would be rectangular, but in reality, the fissures from the grooves that occur when splitting are not vertical but form an angle within a certain range, so the side walls are sloped, forming a diamond shape. .

For this reason, as will be described later, an inconvenient accident has occurred in which the end portion of the pellet is damaged when regulating the position for mounting the pellet.

In other words, to mount pellets, one pellet is transferred from a base on which a large number of pellets are placed onto the stage, one pellet at a time is taken out by suction with a collet, and then placed on a lead frame, etc. The positioning device used to adsorb the pellet with a collet simply moves the pellet placed on a stage by pushing it to the correct position with a push claw.

To illustrate this situation, as shown in Fig. 1, one of the pushing claws 3 slides into contact with the pellet 2 on the stage 1, pushes it as it is, and transfers it to near the normal position 4. The push claw 5 slides from the opposite side and waits in contact with the regular position 4, and the push claw 5 stops receiving the pellet 2 that has been pushed by the push claw 3, and the pellet 2 is placed in the regular position. Positioned at position 4.

Here, when the pushing claws 3, 5 come into contact with the pellet 2, since the side walls of the pellet 2 are sloped as described above, the pushing claws 3, 5 contact the pellet 2 as shown in FIG. Contact portion 3a.

Each of the pellets 5a collides with the sharp end 2at22' of the pellet 2, and accidents often occur in which the ends 2a and 2a' are damaged.

When this defective accident occurs, especially in pellets such as IC,
The terminal electrodes provided at the ends were lost, the properties of the pellets were also poor, and the mounted structure ended up being defective, which was an inconvenience.

In view of the above-mentioned points, the present invention provides a positioning device that does not cause pellet loss accidents, and is designed so that at least one of the contact parts of the pressing claw with the pellet is in line contact with the middle part of the side wall of the pellet. It is characterized by what it did.

An embodiment of the present invention will be explained below with reference to the drawings.

That is, in FIGS. 3A and 3B, 11 is a stage on which pellets 12 are placed, and 13.15 is a stage on which pellets 12 are placed.
The part that comes into contact with the pellet 12 is a step 13c formed by surfaces 13a and 13b and a surface 15.
A step 15c formed by a and 15b is provided.

Reference numeral 16 denotes a collet that is positioned by push claws 13 and 15 and picks up the pellet 12 in the correct position and takes it out upward.

The operation of the positioning device is the same as before and will be omitted, but
In short, when the pushing claws 13.15 come into contact with the pellet 12, the step 13C of the pushing claw 13 is aligned with the side wall intermediate portion 12c of the pellet 12, and the step 15c of the pushing claw 15 is aligned with the side wall intermediate portion 12c' of the pellet 12. It is important to make contact.

Therefore, when the pressing pawl 13.15 abuts the pellet 12, the sharp end 12a of the pellet 12.

Since it does not hit 12a', there is no loss.

In the embodiment described above, a step was provided at the contact portion of the pushing claw with the pellet to form a line contact, but of course other means may also be used, for example, a protrusion may be provided, but the dimensions may vary. It is difficult to process as it requires strict precision.

Since the present invention is configured as described above, it is possible to prevent an accident of chipping of the end portion of the pellet, and it is possible to avoid the structure on which the pellet is mounted from becoming defective.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 show a conventional pellet positioning device, Fig. 1A is a plan view, Fig. 1B is a side view, Fig. 2 is an enlarged side view of main parts, and Fig. 3 is the present invention. 3A is a plan view and FIG. 3B is a side view of a pellet positioning device according to an embodiment of the present invention. 12... Pellet, 12c, 12c'...
・・Side wall middle part, 13, 15・・・・Press claw, 13
c, 15c... step (contact part), 14...
...regular position.

Claims (1)

[Scope of utility model registration request] In an apparatus in which a loaded pellet is pushed a predetermined distance by a push claw to be transferred and positioned at a proper position, at least one of the contact parts of the push claw with the pellet is in line contact with the middle part of the side wall of the pellet. A pellet positioning device characterized by: