# US 5,707,142 A · Lighting fixture > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,142 A - Document ID: US5707142A - Status: Granted - Kind: A - Application number: 08/671,832 - Filed: 1996-10-09 - Granted: 1998-01-13 - Earliest claimed: 1996-10-09 - Assignees: Musco Corporation - Inventors: Myron K. Gordin - Web page: https://patentgrep.com/patent/US5707142A ## CPC - F21V 7/0025: {Combination of two or more reflectors for a single light source (array of reflectors for a cluster of light sources F21V7/0083)} - F21V 7/24: characterised by the material - F21V 7/28: characterised by coatings - F21V 11/02: using parallel laminae or strips, e.g. of Venetian-blind type (F21V11/06 takes precedence) - F21V 17/12: by screwing - F21V 21/30: Pivoted housings or frames - F21W 2131/105: of arenas or the like - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS ## Abstract An improved lighting fixture of the type having a horizontally positioned unjacketed arc lamp in a two piece reflector having a front bowl-shaped reflector that issues a relatively narrow beam and a rear dish-shaped reflector positioned behind the arc tube that issues a wider beam spread. Although such a fixture inherently has some glare and spill control by exploiting the horizontal, transverse positioning of the arc tube across the reflector combination, the invention improves on glare and spill control from this fixture by re-orienting the rear reflector so that it is tipped slightly downward. The upper part of the beam from the rear reflector is therefore moved so that it does not cause glare or spill off of the target area, and also it increases efficiency of the fixture by placing more usable light on the target area. Optionally a visor can be used to further control glare and spill. ## Claims ### Claim 1 A high intensity lighting fixture comprising: a fixture frame; a front reflector mounted to the fixture frame and having a surface of revolution and a central axis; a light source mounted to the fixture frame and elongated along an axis which is transverse to the central axis; a rear reflector mounted to the fixture frame and positioned behind the light source and along the central axis; the rear reflector being tipped relative to the central axis. ### Claim 2 (depends on 1) The fixture of claim 1 wherein the front reflector is bowl shaped with an opening in the back. ### Claim 3 (depends on 2) The fixture of claim 2 wherein the rear reflector fits within the opening in the back of the front reflector. ### Claim 4 (depends on 1) The fixture of claim 1 wherein the light source is an arc tube. ### Claim 5 (depends on 4) The fixture of claim 4 wherein the arc tube is unjacketed. ### Claim 6 (depends on 4) The fixture of claim 4 wherein the art tube is positioned horizontally when in use. ### Claim 7 (depends on 4) The fixture of claim 4 wherein the arc tube is several inches in length along its axis. ### Claim 8 (depends on 1) The fixture of claim 1 wherein the rear reflector is dish shaped, spaced apart from the light source, but closer to the light source than to the front reflector. ### Claim 9 (depends on 1) The fixture of claim 1 wherein the rear reflector has a high reflectivity. ### Claim 10 (depends on 1) The fixture of claim 1 wherein the rear reflector is configured to provide a wider beam spread than the front reflector. ### Claim 11 (depends on 1) The fixture of claim 1 wherein the front reflector is made of spun aluminum. ### Claim 12 (depends on 1) The fixture of claim 1 wherein the rear reflector is tipped in a direction transverse to the axis. ### Claim 13 (depends on 12) The fixture of claim 12 wherein the rear reflector is tipped 0.01 to 5 degrees relative to the central axis. ### Claim 14 (depends on 13) The fixture of claim of claim 13 wherein the rear reflector is tipped approximately 2 degrees. ### Claim 15 (depends on 1) The fixture of claim 1 wherein the rear reflector is tipped so that one margin of the beam spread of the rear reflector comes within an adjacent margin of the beam spread of the front reflector. ### Claim 16 (depends on 1) The fixture of claim 1 further comprising one or more internal cutoff skirts positioned inside a lens across a front opening to the front reflector. ### Claim 17 (depends on 1) The fixture of claim 1 further comprising a visor positioned on and extending forwardly from the front reflector. ### Claim 18 (depends on 1) The fixture of claim 1 further comprising the rear reflector being mounted to a housing of the fixture. ### Claim 19 (depends on 18) The fixture of claim 18 wherein the housing includes a plurality of standoffs extending toward the front of the fixture. ### Claim 20 (depends on 19) The fixture of claim 19 wherein the standoffs have varying heights to hold the rear reflector in a canted position relative to the central axis. ### Claim 21 A method of improving glare and spill control and efficiency of a lighting fixture of the type having a front reflector having a surface of revolution and a central axis; a light source, elongated along an axis which is transverse to the central axis; and a rear reflector positioned behind the light source and along the central axis comprising: tipping the rear reflector relative to the central axis. ### Claim 22 (depends on 21) The method of claim 21 further comprising placing a cutoff skirt inside the fixture. ### Claim 23 (depends on 21) The method of claim 21 further comprising placing a visor on the fixture. ### Claim 24 (depends on 21) The method of claim 21 wherein the rear reflector is tipped between 0.01 and 5 degrees. ### Claim 25 (depends on 21) The method of claim 21 wherein the rear reflector is tipped downward when in use. ### Claim 26 An apparatus for improving glare and spill control and efficiency of a lighting fixture of the type having a front reflector having a surface of revolution and a central axis; a light source, elongated along an axis which is transverse to the central axis; and a rear reflector positioned behind the light source and along the central axis, the improvement comprising: the rear reflector being tipped relative to the central axis.