Patent ID: 6742981
Filing Date: 2004-06-01
Classification: G01R,H01L

Abstract:
An IC handler, comprisinga disk which is rotatably supported in a horizontal plane; two controllable motors disposed on an upper surface of the disk; two driving shafts that downwardly extend through the disk, and that are driven by the two motors respectively, said driving shafts being disposed symmetrically with respect to an axis of rotation of the disk; two hanging members that are engaged with the two driving shafts respectively via driving force converting mechanisms, and that are upwardly and downwardly moved by the rotation of the driving shafts; a clamper attached to a lower end of each of the hanging members; suction pads attached to the lower ends of the clampers; and a disk driving motor that can rotate the disk in a first rotational direction and a second rotational direction opposite to the first rotational direction, wherein after the disk is stopped at a first angular position for a predetermined period, the disk is rotated in the first rotational direction, to a second angular position which is deviated from the first angular position by 180 degrees, by means of the disk driving motor and, after the disk is stopped at the second angular position for a predetermined period, the disk is rotated, in the second rotational direction, to the first angular position; during stop at the first angular position, the clamper engaged with one of the driving shafts carries out a first operation, and the clamper engaged with the other driving shaft carries out a second operation; and during stop at the second angular position, the clamper engaged with said one driving shaft carries out the second operation, and the clamper engaged with the other driving shaft carries out the first operation.