Browse Prior Art Database

Chip Transfer Head With Programmable Probe Centerlines

IP.com Disclosure Number: IPCOM000060425D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Chen, J: AUTHOR [+4]

Abstract

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.

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Chip Transfer Head With Programmable Probe Centerlines

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. Probe 4 is attached to a double-thread, right-hand screw that has twice the lead as does the single-thread screws. Therefore, this probe travels twice the distance that probes 1 and 3 do for the same rotation of the screw. The ratio of the leads is fixed so that the probes will always be on equal centerlines. The stepper motor can be driven by a smart controller so that the probe centerlines can be programmable. The double- thread screw has a larger diameter than the single-thread screws so that a portion of its nut will pass over the single-thread screw when the probes are closest together. Each of the probes...