Patent ID: 7009788

Claim:
An optical arrangement including: a base for rotation about a mechanism-induced rotational axis; an optical pattern layer having a center axis and having at least two portions that each have a different optical characteristic, one of the base and the optical pattern layer having a surface perpendicular to an interface normal direction; means for fixing the optical pattern layer to the base for rotation therewith such that the center axis is aligned against radial offset with the rotational axis; a mechanism for rotating the base and the optical pattern layer around the mechanism-induced rotational axis; and means for fixing the base to the mechanism such that the interface normal direction is aligned against skew from the mechanism-induced rotational axis; wherein the means for fixing the base to the mechanism includes an adhesive that sets once the interface normal direction is aligned; and wherein the mechanism includes a shaft, and the base includes an opening, the opening has a taper, the shaft has an end that has a size equal to the opening at some location along the taper, and the base rests upon the shaft at the location where the opening equals the shaft end.