Patent ID: 7381980

Claim:
An optical system for an internal drum readout apparatus, comprising: a hollow cylindrical segment defining a central axis, the cylindrical segment forming a support surface for a medium to be scanned while the medium conforms to an inner surface thereof; a support structure configured and adapted to translate along the central axis; a mirror mounted on the support structure for translational movement therewith and for rotational spinning around the central axis, the mirror angled with respect to the central axis; a light source mounted to the support structure for providing a beam capable of being directed along the central axis which in turn is directed against the medium thereby producing a stimulated light; a detector coaxially aligned with the central axis, the detector being configured and adapted to absorb stimulated light direct toward and reflected off of the angled mirror; and a shroud mounted on the support structure for blocking stimulated light which is not directed toward the angled mirror, wherein the stimulated light which is not directed toward the angled mirror would otherwise degrade the medium prematurely, the shroud including: a base wall defining a central aperture and a plurality of mounting holes located between said central aperture and an outer terminal edge of said base wall for mounting the shroud to the support structure, such that the mirror rotates relative to the shroud; and a structure protruding from said base wall.