Patent ID: 7181855

Claim:
A projection enhancing method for causing or enhancing projection of a line image onto a work-surface, where the line image appears to dim or disappear from the work-surface in one or more regions of the work-surface and where the line image results at least in part from output of a fan-out of light rays adjacent to the work-surface and from intersection of a first part of the fan-out with the work-surface, the method comprising: (a) intercepting a second part of the fan-out adjacent to a given work-surface region where the line image appears comparatively dim or appears to have vanished; and (b) redirecting radiant energy from the intercepted second part of the fan-out to intersect with a reflective surface in the given work-surface region and to thereby cause the line image to appear as having been enhanced in intensity in the given work-surface region or as having been created in the given work-surface region.