Patent ID: 7426024

Claim:
A system for inspecting a disc-shaped object, whereby the system is surrounded by a housing formed of several walls, wherein an optical element and at least one camera for imaging at least a partial region of the disc-shaped object are provided, wherein an air supply unit is provided above the disc-shaped object that directs the air into the housing, wherein a mounting plate bears a table that is movable in at least an X-direction and a Y-direction on which the disc-shaped object is placed, whereby the mounting plate is vibration isolated in comparison to the housing, wherein an exhaust unit is arranged beneath the mounting plate at a distance, wherein an air inlet opening is implemented in an upper wall of the exhaust unit having a width that essentially corresponds to the distance between the mounting plate and a wall of the housing, wherein the exhaust unit has a lower wall opposite to the upper wall, the lower wall bears at least one fan that draws the air out of the exhaust unit, and wherein the transport capacity of the exhaust unit is calibrated such that it does not exceed the transport capacity of the supply unit.