Constant zone reflector for luminaires and method
OwnerJohn R. Brassinventor
Life of this patent
Estimating the term…
Abstract
A luminaire of the direct lighting type includes a fluorescent lamp for emitting a torodial light pattern to a reflector assembly having a plurality of flat and contiguous facets spaced laterally from the lamp. The reflector functions to reflect the torodial light pattern within parallel light distribution zones. The reflector may be of the cross-beam type (FIGS. 1-4) or down-beam type (FIG. 5). The facets are precisely positioned relative to the light source to provide the above functions whereby the luminaire will function efficiently and will closely control direct and reflected glare. A louver-lens assembly can be utilized to enclose the open bottom of the luminaire and to aid in these functions, a method is also taught for plotting the precise positions of the facets.
Claims30
A luminaire of the direct lighting type for providing constant zone reflection of light comprising
- light source means, having a horizontally disposed longitudinal axis, for emitting a torodial light pattern, said light source means being bisected by an imaginary vertical plane intersecting said axis, and
- a reflector assembly including a plurality of reflector means mounted in spaced relationship from the axis of said light source means on at least one lateral side of said vertical plane and extending in parallel relationship relative to the axis of said light source means for receiving and reflecting said torodial light pattern within parallel light distribution zones, said reflector means comprising a plurality of contiguous facets each being flat and having a highly specular light reflecting surface at least generally facing said light source means, a lowermost first facet of said facets being disposed at a first acute angle relative to said plane, a first image created by said first facet being defined by a pair of first and second rays intersecting on a backside of said first facet and being tangential to opposite sides of said first image, said first and second rays further intersecting upper and lower extremities of said first facet and the center of said first image being positioned on the backside of said facets at a distance from an extended flat plane containing said first facet that is equal to the distance from said flat plane to the axis of said light source means.
A luminaire comprising
- light source means disposed on a longitudinal axis thereof,
- a reflector assembly having said light source means mounted therein and further having an open bottom, and
- a combined and structurally integrated louver-lens means covering the open bottom of said reflector assembly for transmitting, refracting and reflecting light rays in directions parallel relative to said axis with sharp cut-off of high angle direct glare and luminaire brightness, said louver-lens means comprising a lens and a plurality of opaque louvers spaced one from another along said longitudinal axis and secured on an outerside of said lens in transverse relationship relative to said axis, said louvers having exposed reflecting surfaces exhibiting a specular reflectance factor of at least 0.84.
Dependencies are inferred from the claim text.