Patent ID: 7483192

Claim:
A device for optically scanning a medium, said device comprising: deflection mirror means including a deflection surface adapted to deflect light beams incident thereon and having a normal extending rectangularly to said deflection surface, drive means coupled to the deflection mirror means for rotating the deflection mirror means about an axis of rotation, the surface normal being angularly tilted relative to the axis of rotation, said deflection mirror means being located in a bearing-mounted fitting and provided with at least one compensation mass means adapted to compensate for imbalances during rotation so that the axis of rotation coincides with a principal axis of inertia of a combination consisting of the deflection mirror means and the fitting, wherein the position of the compensation mass means relative to the deflection mirror means can be adjusted, the deflection mirror means can be pivoted about a pivot axis perpendicular to the axis of rotation, and the compensation mass means is pivotable relative to the deflection mirror means about the pivot axis of the deflection mirror means, and means for adjusting the angular tilt between the axis of rotation and the mirror normal.