Patent ID: 9153470
Filing Date: 2015-10-06
Classification: H01L

Abstract:
1. A wafer handler comprising: a wafer loading station for loading a wafer mounted on a tack film; a tensioner for tensioning the tacky film; a picking module for successively picking a plurality of devices, each of which have an orientation, from said wafer; a vision system with a first camera for capturing a first image of said wafer or of portions of said wafer, said first image comprising a plurality of devices, wherein said vision system is arranged for determining from said first image the individual position of a plurality of devices and wherein the first image is used to move the wafer roughly to the position of a device to be picked, and wherein said vision system is configured to generate from the first image a wafer location map which indicates the orientation of the wafer, and the rough position and orientation of the each device on the wafer, and wherein the wafer handler further comprises a second camera positioned proximate to said picking module and arranged for capturing a second image of a device to be picked, wherein the second image and the wafer location map are used for fine adjustment of the wafer so that the device to be picked is centered under the picking module; and wherein said first camera is arranged for capturing the first image during the transfer of the wafer from the wafer loading station to under the picking module, and said second camera is arranged for capturing the second image when the wafer has been located under the picking module.