Patent ID: 8599366

Claim:
Method for determining a deformation of a mould wafer comprising the steps of: mounting an inner region of the mould wafer onto a mounting unit in a first mounting position; determining an eccentricity of a centre axis of the mould wafer from a centre axis of the mounting unit in the first mounting position; depositing the mould wafer onto a deposit unit; re-mounting the inner region of the mould wafer onto the mounting unit in a second mounting position based on the determined eccentricity, the eccentricity in the second mounting position being substantially zero; moving the mounting unit into a predetermined height position; measuring a deviation of a plurality of measuring points respectively in a non-mounted outer region of the mould wafer from the predetermined height position corresponding to the deformation by means of a fixed-height detector unit by rotating the mounting unit or the detector unit about suitable angles of rotation; wherein the mounting of the inner region of the mould wafer is effected using a plurality of support pins and a plurality of vacuum intake elements; wherein one support pin of the plurality of support pins respectively is surrounded by an associated one of the plurality of vacuum intake elements respectively; wherein the vacuum intake elements comprise a respective lip seal, which surrounds the respectively associated support pin; and wherein the mould wafer is carried by the support pins and the lip seals in the mounted state.