Inventors:
A. Michael Smith - Boulder CO
Henry Holt Frazier - Broomfield CO
Assignee:
Steris Corporation - Mentor OH
International Classification:
F21V 708, F21V 904
Abstract:
A surgical lighthead having a stacked elliptical reflector (20) directs light from a lamp (10) to an illumination zone (Y) without the need for a refractor to redirect the reflected light. The reflector is formed of at least three annular reflector segments (22, 24, 26) stacked on top of each other to form a continuous reflector surface. Each of the reflector segments has a longitudinal cross section of a different conical shape such as elliptical or parabolic for directing the light to a different portion of the illumination plane. The stacked elliptical reflector provides the benefits of reduction of the image of the filament in the light field and reduction of shadowing due to objects passing between the lighthead and the illumination plane.