US3829680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting panel
Assignee: CARROLL J AND SONS
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Filing: 1972-11-24
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Granted: 1974-08-13
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Expires: 1992-11-24
Abstract
Abstract A lighting panel for use in overhead lighting fixtures and the like which may readily be fabricated in plastic sheet by extrusion-embossing techniques and which minimizes veiling reflections. The panel contains a continuous pattern of triangular projections, each having three mutually substantially perpendicular surfaces projecting upward for disposition toward the light source. The base lines of the mutually perpendicular surfaces are co-planar and the pattern of projections is such that the base lines of all projections on a panel form continuous straight lines directed in three specific directions. This allows the fabrication of a relatively inexpensive engraved roller for embossing the pattern on a plastic sheet and results in a light panel which minimizes veiling reflections from the illuminated matter. The panel in accordance with the present invention provides a radial distribution of light with high lighting efficiency and with the maximum light in the area which is 30* to 60* from the vertical.
Inventors
- 👤 B Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:54
CPC Classifications
F; F21; F21V; F21V5/00; F21V5/02; F21S; F21S2/00; F21S8/00; F21S8/02; F21S8/026; F21V3/00; F21V3/04; F21V3/049; F21Y; F21Y2103/00; F21Y2113/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
113 words
A lighting panel having on one surface thereof a pattern of protrusions each defined by three generally flat triangular surfaces, each of said triangular surfaces having first and second sides and a base, and mating the other two of said three triangular surfaces defining each of said protrusions on said first and second sides thereof, each of said bases of said three triangular surfaces defining each of said protrusions being substantially coincident with the base of one of said triangular surfaces defining an adjacent protrusion, all of said bases being substantially coplanar, each of said three triangular surfaces being disposed at approximately 50* to 60* with respect to the plane of said bases.
Claim 2
Dependent Claim
113 words
A lighting panel having on one surface thereof a pattern of protrusions each defined by three generally flat triangular surfaces, each of said triangular surfaces having first and second sides and a base, and mating the other two of said three triangular surfaces defining each of said protrusions on said first and second sides thereof, each of said bases of said three triangular surfaces defining each of said protrusions being substantially coincident with the base of one of said triangular surfaces defining an adjacent protrusion, all of said bases being substantially coplanar, each of said three triangular surfaces being disposed at approximately 50* to 60* with respect to the plane of said bases.
Claim 3
Dependent Claim
21 words
The lighting panel of claim 1 wherein said three triangular surfaces defining each of said protrusions being mutually substantially perpendicular surfaces.
Claim 4
Dependent Claim
26 words
The lighting panel of claim 2 wherein there is affixed to the surface opposite said one surface a second panel designed to further reduce veiling reflections.
Claim 5
Dependent Claim
23 words
The lighting panel of claim 1 wherein there is affixed to said one surface a high transmission overlay means for damping lamp images.
Claim 6
Dependent Claim
25 words
The lighting panel of claim 1 wherein there is impressed into the surface opposite said one surface a pattern designed to further reduce veiling reflections.
Claim 7
Dependent Claim
177 words
A lighting panel having on one surface thereof a pattern of protrusions defined by a first set of parallel, equidistantly spaced V grooves directed downward into said panel; a second set of parallel V grooves directed downward into said panel; said second set of V grooves having the same spacing as said first set and crossing said first set at an angle of approximately 60*; and a third set of parallel V grooves directed downward into said panel; saId third set of V grooves having the same spacing as said first set and crossing said first and second sets at an angle of approximately 60*; said first, second and third sets of V grooves being disposed so that the lines defined by the junction of the two sides of each of said V grooves are substantially coplanar, each of said two sides of each of said V grooves being disposed at approximately 50* to 60* with respect to the plane of said lines defined by the junction of the two sides of each of said V grooves.
Claim 8
Dependent Claim
177 words
A lighting panel having on one surface thereof a pattern of protrusions defined by a first set of parallel, equidistantly spaced V grooves directed downward into said panel; a second set of parallel V grooves directed downward into said panel; said second set of V grooves having the same spacing as said first set and crossing said first set at an angle of approximately 60*; and a third set of parallel V grooves directed downward into said panel; saId third set of V grooves having the same spacing as said first set and crossing said first and second sets at an angle of approximately 60*; said first, second and third sets of V grooves being disposed so that the lines defined by the junction of the two sides of each of said V grooves are substantially coplanar, each of said two sides of each of said V grooves being disposed at approximately 50* to 60* with respect to the plane of said lines defined by the junction of the two sides of each of said V grooves.
Claim 9
Dependent Claim
45 words
The lighting panel of claim 6 wherein each of said two sides of each of said V grooves are disposed at approximately 57* with respect to the plane of said lines defined by the junction of the two sides of each of said V grooves.
Claim 10
Dependent Claim
37 words
The lighting panel of claim 6 wherein there is affixed to the side opposite said one side of the panel an acrylic sheet of high light transmitting diffusing material for damping lamp images visible through said panel.
Claim 11
Dependent Claim
151 words
In a lighting fixture of the type including a housing and a light source within the housing, a lighting panel having first and second surfaces, and having on said first surface thereof a pattern of protrusions each defined by three generally triangular surfaces; each of said triangular surfaces having first and second sides and a base and mating the other two of said three triangular surfaces defining each of said protrusions on said first and second sides thereof; each of said bases of said three triangular surfaces defining each of said protrusions being substantially coincident with the base of one of said triangular surfaces defining an adjacent protrusion, all of said bases being substantially co-planar; said triangular surfaces being inclined with respect to the plane of said bases by a predetermined angle so that light coming directly toward said second surface is redirected back toward its original direction by said pattern.
Claim 12
Dependent Claim
151 words
In a lighting fixture of the type including a housing and a light source within the housing, a lighting panel having first and second surfaces, and having on said first surface thereof a pattern of protrusions each defined by three generally triangular surfaces; each of said triangular surfaces having first and second sides and a base and mating the other two of said three triangular surfaces defining each of said protrusions on said first and second sides thereof; each of said bases of said three triangular surfaces defining each of said protrusions being substantially coincident with the base of one of said triangular surfaces defining an adjacent protrusion, all of said bases being substantially co-planar; said triangular surfaces being inclined with respect to the plane of said bases by a predetermined angle so that light coming directly toward said second surface is redirected back toward its original direction by said pattern.
Claim 13
Dependent Claim
193 words
An improved lighting panel comprising a sheet having first and second surfaces, and having on said first first surface thereof a pattern of protrusions, each of said protrusions having a plurality of surfaces extending toward an apex, each of said protrusion surfaces being inclined at a predetermined angle with respect to a first line perpendicular to said second panel surface, said predetermined angle being an angle smaller than the limiting angle at which total reflection of light impinging on a first of said protrusion surfaces from within said panel and directed along said first line would occur, whereby total reflection of said light toward a second of said protrusion surfaces would occur, said predetermined angle being an angle larger than the limiting angle at which said light reflected by said first of said protrusion surfaces would be totally reflected by said second of said protrusion surfaces, whereby light impinging on said panel substantially perpendicular to said second panel surface will be reflected by said pattern back toward the direction said light originated as a result of the reflection of said light from at least a first and a second surface of said protrusions.
Claim 14
Dependent Claim
193 words
An improved lighting panel comprising a sheet having first and second surfaces, and having on said first first surface thereof a pattern of protrusions, each of said protrusions having a plurality of surfaces extending toward an apex, each of said protrusion surfaces being inclined at a predetermined angle with respect to a first line perpendicular to said second panel surface, said predetermined angle being an angle smaller than the limiting angle at which total reflection of light impinging on a first of said protrusion surfaces from within said panel and directed along said first line would occur, whereby total reflection of said light toward a second of said protrusion surfaces would occur, said predetermined angle being an angle larger than the limiting angle at which said light reflected by said first of said protrusion surfaces would be totally reflected by said second of said protrusion surfaces, whereby light impinging on said panel substantially perpendicular to said second panel surface will be reflected by said pattern back toward the direction said light originated as a result of the reflection of said light from at least a first and a second surface of said protrusions.
Claim 15
Dependent Claim
32 words
The lighting panel of claim 10 wherein each of said protrusions is defined by a plurality of generally flat surfaces so that a cross-section of each of said protrusions is a polygon.
Claim 16
Dependent Claim
13 words
The lighting panel of claim 11 wherein said cross-section is an equilateral triangle.
Claim 17
Dependent Claim
107 words
A lighting panel having on one surface thereof a pattern defined by a plurality of groups of three generally triangular surfaces, each of said triangular surfaces having first and second sides and a base, and mating the other two of said three triangular surfaces on said first and second sides thereof, each of said bases of said three triangular surfaces in a group being substantially coincident with the base of one of said triangular surfaces in an adjacent group, all of said bases being substantially coplanar, each of said three triangular suRfaces being disposed at approximately 50* to 60* with respect to the plane of said bases.
Claim 18
Dependent Claim
107 words
A lighting panel having on one surface thereof a pattern defined by a plurality of groups of three generally triangular surfaces, each of said triangular surfaces having first and second sides and a base, and mating the other two of said three triangular surfaces on said first and second sides thereof, each of said bases of said three triangular surfaces in a group being substantially coincident with the base of one of said triangular surfaces in an adjacent group, all of said bases being substantially coplanar, each of said three triangular suRfaces being disposed at approximately 50* to 60* with respect to the plane of said bases.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |