Browse Prior Art Database

Airjaw Centering Device

IP.com Disclosure Number: IPCOM000120464D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 37K

Publishing Venue

IBM

Related People

Phillips, RB: AUTHOR

Abstract

Disclosed is an airjaw centering device which prevents damage to square and rectangular devices, e.g., semiconductor chips, due to the mechanical clamping action of various types of contact centering systems. (Image Omitted)

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Airjaw Centering Device

      Disclosed is an airjaw centering device which prevents damage
to square and rectangular devices, e.g., semiconductor chips, due to
the mechanical clamping action of various types of contact centering
systems.

                            (Image Omitted)

      The operation consists of first moving an airjaw 10 and a
reference jaw to a home position for initialization. Prior to the
presentation of a device 14, the jaws 10 and 12 are commanded to a
ready position.  This position is based on the device size.  The
device 14 is then lowered into position with its z axis the same as
10 and 12, and nitrogen is supplied to the airjaw 10.

      The nitrogen exits 10, placing a burst of nitrogen on two edges
of the device 14.  Device 14 is pushed by the nitrogen into
engagement with 12, correcting for x, y and theta error.

      Jaws 10 and 12 are then moved inward, with nitrogen still
applied, to a final clamp position, at which time the nitrogen is
turned off.  At this final position, jaw 12 maintains x, y and theta
of device 14 and jaw 10 is in a non-contact position with respect to
device 14.  For the final sequence, jaws 10 and 12 are retracted back
to the ready position.

      Disclosed anonymously.