Patent ID: 7057707

Claim:
A method for adjusting an alignment microscope ( 1 ) comprising the steps: (a) providing an alignment mask ( 5 ) in which one side ( 51 ) comprises at least one alignment mark ( 53 ) and the other side ( 52 ) is reflective in at least the area ( 54 ) opposite to the alignment mark ( 53 ); (b) focusing the microscope ( 1 ) to the alignment mark ( 53 ); (c) refocusing the microscope ( 1 ) to the mirror image ( 53 ′) of the alignment mark ( 53 ) being generated by the reflective side ( 52 ); (d) comparing the position of the alignment mark ( 53 ) and that of the generated mirror image ( 53 ′) of the alignment mark ( 53 ); (e) adjusting the microscope ( 1 ) so that the alignment mark ( 53 ) and the mirror image ( 53 ′) thereof superimpose; and (f) repeating steps (b) to (e) until the comparison in step (d) reveals that the alignment mark ( 53 ) and the mirror image ( 53 ′) of the alignment mark ( 53 ) are aligned with respect to each other.