Patent ID: 7355386
Filing Date: 2008-04-08
Classification: H01L

Abstract:
1. A method of automatically carrying IC-chips, on a planar array of vacuum nozzles, to a variable target in a chip tester; said method including the steps of: measuring a set of distances, to a reference in said chip tester for said target, with a set of lasers that are attached to said planar array of nozzles; selecting a direction and/or angle of movement as a function of the measured set of distances, using a control module in said chip tester; moving said planar array of nozzles, via a robotic arm in said chip tester, by an increment in the direction and/or angle selected by said control module; repeating said measuring, selecting, and moving steps until said control module detects that the distances measured by said lasers meet a predetermined criteria; storing control signals by the control module in said chip tester which identify the particular position of said robotic arm when the distances measured by said lasers meet said predetermined criteria; and thereafter, carrying IC-chips on said planar array of nozzles while said control module uses the stored control signals to move said robotic arm to said particular position.