US3746854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tangent plane light reflector luminaire
Assignee: Individual
•
Filing: 1972-05-30
•
Granted: 1973-07-17
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Expires: 1992-05-30
Abstract
Abstract A tangent plane light reflector principle for use in the design of luminaires is disclosed. Luminaires embodying the tangent light plane principle are described. The design and fabrication of luminaires embodying the tangent light plane principle for specific applications are discussed.
Inventors
- 👤 J Brass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:05
CPC Classifications
F; F21; F21S; F21S8/00; F21S8/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
269 words
A luminaire having a given optical axis and a given light cut-off angle measured with respect to said axis from nadir for spreading light emanating from a given light source having an actual source of light of finite maximum cross-sectional dimensions over a given area to be illuminated, said luminaire comprising a first reflector surface and a second reflector surface; said first reflector surface having a finite dimension along a first line intersecting said optical axis at a point on the opposite side of the center of said actual source of light of said given light source from said area to be illuminated and forming an angle with respect to said given optical axis from nadir which is the supplement of said given cut-off angle, said first line being substantially tangent to a minimum circular cross-section circumscribing the maximum cross-sectional dImensions of the actual source of light of said given light source, said point of intersection of said first line and said optical axis being spaced a finite distance from the center of said actual source; and said second reflector surface being spaced from said light source along said first line and extending from said first reflector surface toward said given area to be illuminated at an angle which is substantially a right angle with respect to said first line, the distance from the center of said light source to said point of intersection of said first line with said optical axis being less than one fifth of the distance from said optical axis along said first line by which said second reflector is spaced from said light source.
Claim 2
Dependent Claim
269 words
A luminaire having a given optical axis and a given light cut-off angle measured with respect to said axis from nadir for spreading light emanating from a given light source having an actual source of light of finite maximum cross-sectional dimensions over a given area to be illuminated, said luminaire comprising a first reflector surface and a second reflector surface; said first reflector surface having a finite dimension along a first line intersecting said optical axis at a point on the opposite side of the center of said actual source of light of said given light source from said area to be illuminated and forming an angle with respect to said given optical axis from nadir which is the supplement of said given cut-off angle, said first line being substantially tangent to a minimum circular cross-section circumscribing the maximum cross-sectional dImensions of the actual source of light of said given light source, said point of intersection of said first line and said optical axis being spaced a finite distance from the center of said actual source; and said second reflector surface being spaced from said light source along said first line and extending from said first reflector surface toward said given area to be illuminated at an angle which is substantially a right angle with respect to said first line, the distance from the center of said light source to said point of intersection of said first line with said optical axis being less than one fifth of the distance from said optical axis along said first line by which said second reflector is spaced from said light source.
Claim 3
Dependent Claim
26 words
A luminaire as claimed in claim 1 wherein said center of said actual source of light has its locus on said optical axis of said luminaire.
Claim 4
Dependent Claim
28 words
A luminaire as claimed in claim 1 wherein the locus of said center of said actual source of light is displaced from said optical axis of said luminaire.
Claim 5
Dependent Claim
46 words
A luminaire as claimed in claim 1 wherein said given light source is elongated along a longitudinal axis which is substantially perpendicular to said given optical axis and wherein said first reflector surface is a planar surface having a substantial dimension parallel to said longitudinal axis.
Claim 6
Dependent Claim
29 words
A luminaire as claimed in claim 4 wherein said dimension of said first reflector surface parallel to said longitudinal axis is greater than the elongation of said light source.
Claim 7
Dependent Claim
34 words
A luminaire as claimed in claim 5 wherein said second reflector surface is a substantially planar surface having a major dimension extending in the same general direction as the direction of said longitudinal axis.
Claim 8
Dependent Claim
38 words
A luminaire as claimed in claim 6 wherein said major dimension of said second reflector surface is greater than the elongation of said light source and said second reflector surface is curved with respect to said longitudinal axis.
Claim 9
Dependent Claim
50 words
A luminaire as claimed in claim 6 comprising a pair of first reflector surfaces and a pair of second reflector surfaces, each one of said pairs having an orientation that is the mirror image of the orientation of the other of said pairs on opposite sides of said optical axis.
Claim 10
Dependent Claim
24 words
A luminaire as claimed in claim 8 wherein the ends of said pair of first reflector surfaces adjacent said light source are spaced therefrom.
Claim 11
Dependent Claim
36 words
A luminaire as claimed in claim 9 wherein a third reflector surface extends between the ends of said first reflector surfaces adjacent said light source, said third reflector surface being curved away from said light source.
Claim 12
Dependent Claim
50 words
A luminaire as claimed in claim 1 wherein said second reflector surface extends to a point located on a second line forming an angle with said optical axis equal to said given cut-off angle and tangent to said circular cross-section on the side thereof adjacent said area to be illuminated.
Claim 13
Dependent Claim
109 words
A luminaire as claimed in claim 11 wherein said second reflector has a length substantially equal to twice the diameter of said circular cross-section and including third and fourth reflector surfaces, said third reflector surface having a finite dimension beginning at the free end of said second reflector and extending away from said light source along a third line tangent to said circular cross section on the opposite side thereof from said area to be illuminated and passing through said free end of said second reflector, said fourth reflector surface being spaced along said third reflector surface from said light source and extending toward said area to be illuminated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |