Patent ID: 8182100

Claim:
An optical system for directing light from a source onto a target, the source having an axis, a first end directed towards the target, and a second end, and the target being generally in a plane perpendicular to the axis of the source, the optical system comprising: a pair of primary optical elements symmetrical with respect to a reference plane passing through the source and perpendicular to the target plane and arranged to direct light from the source towards the second end; wherein the two primary optical elements together encircle the source, and meet along the reference plane on both sides of the source; and a pair of secondary optical elements symmetrical with respect to said reference plane and arranged at the second end to direct the light from respective ones of the primary optical elements onto the target; wherein each primary optical element and its associated secondary optical element form at the target plane an image of the source with an image axis lying in the plane of the target that is an image of the source axis, and the image axes are oriented in the same direction.