Patent ID: 6702452
Filing Date: 2004-03-09
Classification: F21L,F21S,F21V,H05B

Abstract:
An apparatus for efficiently producing a high intensity narrow, substantially collimated beam of light which includes a user adjustable zoom comprising:an arc lamp having a plasma which is characterized by a longitudinal arc in which said light is produced; a single reflector surrounding said lamp, said reflector having a longitudinal optical axis and a focal range from which light is reflected within a predetermined range of collimation of said beam of light, said plasma of said arc lamp being positioned on said optical axis within said focal range; a single threaded coupling between said lamp and single reflector so that longitudinal position of said reflector relative to said arc lamp is adjustable while in use; wherein said reflector is longitudinally displaceable relative to said lamp by means of rotation about said threaded coupling so that said reflector is longitudinal displaced along said optical axis while maintaining said plasma of said lamp on said longitudinal optical axis within said focal range, a lamp housing and wherein said lamp is fixed within said lamp housing, said reflector being coupled to said lamp housing and longitudinally displaceable with respect to said lamp housing; said lamp housing having a shoulder in sliding juxtaposition with said reflector to maintain said reflector on said longitudinal optical axis as said reflector is longitudinal displaced by means of rotation about said threaded coupling.