Patent ID: 8836943

Claim:
An alignment device comprising: an optical aligner system including a plurality of aligners configured to measure a position of a workpiece having a plurality of alignment marks; and an optical member configured to diverge alignment beams reflected from neighboring alignment marks of the plurality of alignment marks and transmit the beams to neighboring aligners of the plurality of aligners respectively if a distance between the neighboring aligners is greater than a distance between the neighboring alignment marks, a portion of the optical member being configured to move in an axial direction perpendicular to the workpiece to enable measurement if the distance between the neighboring alignment marks changes and remains less than the distance between the neighboring aligners, wherein the optical member includes, a first optical element having a first reflective face and a second reflective face perpendicular to each other, a second optical element having a third reflective face facing the first reflective face of the first optical element, and a third optical element having a fourth reflective face facing the second reflective face the first optical element.