Chip Transfer Head With Programmable Probe Centerlines
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
This article describes a chip transfer head which transfers multiple chips from one type of device carrier to another type of device carrier without head changeover. Referring to the drawings, Fig. 1 is a top view of the chip transfer head disclosed herein. Fig. 2 is a front view of the head, and Fig. 3 is a side view. Four vacuum probes 1, 2, 3 and 4 are mounted on a multiple threaded lead screw 5 and driven by a stepper motor 6. Probe 2 is fixed as a reference point. The one lead screw 5 has three separate screws machined on it. Probe 1 is attached to a single-thread, left-hand screw, and probe 3 is attached to a single thread, right-hand screw. The right- and left-hand threads have equal pitches so that when the stepper motor turns the screw, these two probes travel in equal and opposite directions.