Patent ID: 7726843
Filing Date: 2010-06-01
Classification: F21S,F21V,F21W

Abstract:
1. A device comprising: an optical beam producing part producing a light beam along a path; a relay lens assembly with a first relay lens part and a second relay lens part separated from said first relay lens part along said path, said relay lens assembly defining simultaneously a first focus location and a second focus location at two separated locations along the path; a first optical altering element at said first focus location; and a second optical altering element at said second focus location, wherein the optical altering element at said first focus location, and the optical altering element at said second focus location each include gobos, thereby providing two gobos which are both precisely in focus at the same time, wherein said first optical altering element includes first and second optical elements, spaced from one another along said path; and a moving part, which moves to create motion in a direction parallel to said path, to move in a direction of said path to place one of said first and second optical elements into focus along said optical path, so that either of said first or second optical element can be in the first focus location at any time, depending on a position of said moving part.