Patent ID: 7226270
Filing Date: 2007-06-05
Classification: B65G,H05K

Abstract:
1. An apparatus for transferring semiconductor devices in a handler, comprising: rectangular frames movably installed on a handler body; two linear motors installed on inner sides of two adjacent frames of the rectangular frames, each linear motor comprising a stator and a mover configured to move along the stator; a reference pickup member fixed to an inner corner formed where the two adjacent frames meet and configured to pick up a semiconductor device; a first pickup member and a second pickup member each coupled to a respective one of said movers and configured to move along a respective one of the rectangular frames; a first guide member fixed to the first pickup member and oriented parallel to the respective frame with the second pickup member coupled thereto; a second guide member fixed to the second pickup member and positioned in a different horizontal plane than the first guide member; a third pickup member coupled to both the first and second guide members and configured to move along the second and first guide members in response to movement of the first and second pickup members, respectively; a position sensing device configured to detect positions of the first and second pickup members before the linear motors are driven, wherein the position sensing device comprises: a control unit configured to control movements of the movers of the linear motors by detecting displacements of the first and second pickup members when the respective linear motor is driven, wherein the control unit comprises: