Patent ID: 7432701

Claim:
An adjusting device for adjusting a wafer ( 2 ) on a mounting fixture ( 4 ), said mounting fixture ( 4 ) for mounting a wafer ( 2 ) thereon, the adjusting device comprised of: a mounting fixture ( 4 ) having a mounting side ( 4 a ) for mounting a wafer ( 2 ) thereon, an entrance side 4 b ), and at least one though-hole ( 5 ) directed essentially orthogonal to the mounting side ( 4 a ), wherein the though-hole ( 5 ) on the mounting side ( 4 a ) has a smaller cross-section than on the entrance side ( 4 b ); a light source ( 8 ) located below the mounting fixture ( 4 ) for transmitting light though the though-hole ( 5 ) from the entrance side ( 4 b ) to the mounting side ( 4 a ); and an optical detection device ( 7 ) located above the mounting fixture ( 4 ) for detecting the light transmitted through the though-hole ( 5 ) by the light source ( 8 ).