Variable beam width lighting device
AssigneeMycro-Group Company
InventorsMyron K. Gordin, James L. Drost
Life of this patent
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Abstract
A variable beam width lighting device including a luminaire assembly having a luminaire fixture to which are operatively mounted a reflector and a lamp and to which is operatively supplied electrical power to produce a light beam. An adjustable lamp positioning means is mounted between the lamp and the luminaire fixture. The adjustable lamp positioning means is responsive to a power means to move the lamp relative to the reflector to vary the width of the light beam between a narrow beam and a wide beam according to choice. The reflecting properties of the reflector are varied to produce smooth transition characteristics when the beam width is changed.
Claims19
In a luminaire assembly for high power, high intensity lighting applications, comprising a luminaire fixture to which are operatively mounted a reflector having, an innermost center portion and an outermost peripheral portion, and a high power, high intensity lamp, and to which is operatively supplied electrical power to produce a light beam, the improvement comprising:
- an adjustable lamp positioning means mounted between said luminaire fixture and said lamp and being responsive to a power means to move said lamp relative to said reflector to vary the width of said light beam between a narrow beam and a wide beam according to choice;
- and
- variable reflector surface light dispersing means associated with the reflector to present a reflecting surface which is generally specular at the innermost center portion but becomes gradually increasingly less specular and more light dispersing towards the outermost peripheral portion of the reflector to produce smooth and complete transition of the light beam when the lamp is moved relative to the reflector.
Dependencies are inferred from the claim text.