IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0531960
(2006-09-14)
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등록번호 |
US-7481552
(2009-01-27)
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발명자
/ 주소 |
- Mayfield, III,John T.
- Lydecker,Stephen H.
- Brown,Brian G.
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출원인 / 주소 |
|
대리인 / 주소 |
Ballard Spahr Andrews & Ingersoll, LLP
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인용정보 |
피인용 횟수 :
25 인용 특허 :
13 |
초록
▼
A light fixture or troffer for directing light emitted from a light source toward an area to be illuminated, including a reflector assembly within which the light source is positioned and a lens assembly detachably secured to a portion of the reflector assembly such that a lens of the lens assembly
A light fixture or troffer for directing light emitted from a light source toward an area to be illuminated, including a reflector assembly within which the light source is positioned and a lens assembly detachably secured to a portion of the reflector assembly such that a lens of the lens assembly overlies the light source and such that substantially all of the light emitted from the light source passes through the lens assembly. The reflector assembly including at least one longitudinally extending hollow that extends inwardly to a central portion between respective first and second hollow edges. Each hollow has a plurality of longitudinally extending male ridges.
대표청구항
▼
What is claimed is: 1. A light fixture for directing light emitted from a light source toward an area to be illuminated, the light source being elongated along a light source longitudinal axis, comprising: a) lens assembly comprising: i) an elongate lens extending along a lens longitudinal axis par
What is claimed is: 1. A light fixture for directing light emitted from a light source toward an area to be illuminated, the light source being elongated along a light source longitudinal axis, comprising: a) lens assembly comprising: i) an elongate lens extending along a lens longitudinal axis parallel to said light source longitudinal axis and having a central lens portion curved in a plane transverse to the lens longitudinal axis that defines a prismatic face that is oriented toward and spaced from said light source and an opposed, substantially smooth, exterior surface; and ii) a means for generating a plurality of spaced elongate stripes of reduced brightness on the exterior surface of the lens to control high angle glare in the longitudinal direction optically comprising a plurality of adjoining elongate prismatic elements formed on the prismatic face of the central lens portion that extend parallel to said lens longitudinal axis, wherein each prismatic element has a curved surface facing said light source, wherein each pair of adjoining elongate prismatic elements form a common elongate cusp edge, wherein each elongate prismatic element of the plurality of adjoining elongate prismatic elements is configured such that a reverse ray impacting the elongate prismatic element proximate the common cusp edge at an angle of incidence ω of at least about 40° will undergo total internal reflection and be reflected back into the area to be illuminated to form a stripe of reduced brightness on the exterior surface of the lens, and wherein each stripe of reduced brightness extends substantially parallel to the lens longitudinal axis; and b) a reflector assembly comprising: i) an elongated base member having a first longitudinally extending side edge and an opposed second longitudinally extending side edge; ii) at least one longitudinally extending hollow having a longitudinal axis, a longitudinally extending first hollow edge and a longitudinally extending second hollow edge, at least a portion of a cross-section of the hollow normal to the longitudinal axis of the hollow having a generally curved shape, the at least one hollow extending inwardly toward a central portion defined by and between the respective first and second hollow edges; and iii) a means for generating a plurality of spaced elongate stripes of reduced brightness on the at least one longitudinally extending hollow, comprising a plurality of longitudinally extending male ridges formed thereon each of the at least one longitudinally extending hollow, wherein each ridge comprises a first surface and an adjoining second surface, wherein each first surface is positioned at a first angle relative to a reflector plane that bisects the longitudinal axis of the at least one hollow normal to a base member plane that bisects the respective side edges of the base member, wherein the first angle is an acute angle such that the first surface of each ridge faces substantially inwardly toward the reflector plane, and wherein the second surface of each ridge is positioned at a second angle relative to the reflector plane. 2. The light fixture of claim 1, wherein the second angle of the second surface is greater than the first angle of an adjoining first surface, and wherein the second surface of each respective ridge is positioned closer to the reflector plane than the first surface of each such ridge. 3. The light fixture of claim 2, further comprising a linear light source having at least one end, the linear light source being mounted within a portion of the central portion of the reflector assembly. 4. The reflector assembly of claim 2, wherein the second angle of the second surfaces of a first portion of the plurality of male ridges is an acute angle such that the respective second surfaces of said first portion of the plurality of male ridges face substantially inwardly toward the reflector plane. 5. The reflector assembly of claim 4, wherein the second angle of the second surface of a second portion of the plurality of male ridges is an obtuse angle such that the respective second surfaces of said second portion of the plurality of male ridges face substantially outwardly relative to the reflector plane. 6. The light fixture of claim 5, wherein the second surface of each respective ridge has a cross-sectional length that is less than the cross-sectional length of the first surface of each respective ridge. 7. The light fixture of claim 6, wherein the cross-sectional length of the second surface of each respective ridge is between about 30 and 50 percent of the cross-sectional length of the first surface of each respective ridge. 8. The light fixture of claim 1, wherein the plurality of ridges comprises a series of longitudinally extending male ridges defined within each side of the at least one hollow divided by the central portion of said hollow. 9. The light fixture of claim 8, wherein each series of ridges extends outwardly, in opposed directions from the longitudinal axis of the reflector assembly toward a respective one of the first and second hollow edges. 10. The light fixture of claim 9, wherein each series of ridges is a substantial mirror image of the other. 11. The light fixture of claim 9, wherein the at least one hollow comprises a pair of longitudinally extending hollows, and wherein each such hollow is positioned such that the respective reflector planes of each hollow extend substantially parallel to one another. 12. The light fixture of claim 1, wherein the reflector assembly comprises at least one end face forming an obtuse angle with respect to the longitudinal axis of the reflector assembly. 13. The light fixture of claim 12, wherein the at least one end face defines an opening that is configured for receiving at least a portion of the light source therein. 14. The light fixture of claim 1, wherein the base member further has base surface, a first end edge and a spaced second end edge that are connected to the respective first longitudinally extending side edge and the second longitudinally extending side edge, and a base longitudinal axis extending between the first end edge and the second end edge of the base member, wherein a portion of said base surface defines the at least one hollow. 15. The light fixture of claim 1, wherein at least a portion of the hollow extending between its central portion and the respective first and second hollow edges form a generally curved reflective surface. 16. The light fixture of claim 1, wherein the central portion of the hollow defines a longitudinally extending trough that extends inwardly away from the surface of the hollow. 17. A light fixture that is mountable in relation to a ceiling plane, comprising: a) lens assembly comprising: i) an elongate lens extending along a lens longitudinal axis and having a central lens portion curved in a plane transverse to the lens longitudinal axis that defines a prismatic face that is oriented toward and spaced from said light source and an opposed, substantially smooth, exterior surface; and ii) a means for generating a plurality of spaced elongate stripes of reduced brightness on the exterior surface of the lens to control high angle glare in the longitudinal direction optically comprising a plurality of adjoining elongate prismatic elements formed on the prismatic face of the central lens portion that extend parallel to said lens longitudinal axis, wherein each prismatic element has a curved surface facing said light source, wherein each pair of adjoining elongate prismatic elements form a common elongate cusp edge, wherein each elongate prismatic element of the plurality of adjoining elongate prismatic elements is configured such that a reverse ray impacting the elongate prismatic element proximate the common cusp edge at an angle of incidence ω of at least about 40° will undergo total internal reflection and be reflected back into the area to be illuminated to form a stripe of reduced brightness on the exterior surface of the lens, and wherein each stripe of reduced brightness extends substantially parallel to the lens longitudinal axis; and b) a reflector assembly comprising at least one longitudinally extending hollow having a longitudinally extending first hollow edge and a longitudinally extending spaced second hollow edge, at least a portion of a cross-section of the hollow normal to a longitudinal axis of the hollow having an at least partially arcuate shape, the at least one hollow extending inwardly toward a central portion thereof defined by and between the respective first and second hollow edges, said at least one hollow including a plurality of longitudinally extending ridges, each such ridge comprising a first surface and an adjoining second surface with the first surface positioned at a first angle relative to a reflector plane that bisects the longitudinal axis of the hollow normal to the ceiling plane, the first angle being an acute angle, such that each first surface faces substantially inwardly toward the reflector plane, wherein each second surface is positioned at a second angle relative to the reflector plane that is greater than the first angle of an adjoining first surface, and wherein the second surface of each respective male ridge is positioned closer than the first surface with respect to the reflector plane. 18. The light fixture of claim 17, wherein the second angle of the second surfaces of a first portion of the plurality of male ridges is an acute angle such that the respective second surfaces of said first portion of the plurality of male ridges face substantially inwardly toward the reflector plane. 19. The light fixture of claim 18, wherein the second angle of the second surface of a second portion of the plurality of male ridges is an obtuse angle such that the respective second surfaces of said second portion of the plurality of male ridges face substantially outwardly relative to the reflector plane. 20. The light fixture of claim 17, wherein the second surface of each male ridge has a cross-sectional length that is less than the cross-sectional length of the first surface. 21. The light fixture of claim 20, wherein the cross-sectional length of the second surface is between about 30 and 50 percent of the cross-sectional length of the first surface. 22. The light fixture of claim 17, wherein the plurality of ridges comprises a pair of opposed sets of male ridges. 23. The light fixture of claim 22, wherein each pair of ridges comprises a first set of male ridges and an opposed second set of male ridges, wherein the respective first and second sets of ridges extend outwardly and in opposed directions away from the longitudinal axis of the reflector assembly toward the respective first and second hollow edges of the at least one hollow. 24. The light fixture of claim 23, wherein the first set of ridges is a substantial mirror image of the second set of male ridges. 25. The light fixture of claim 23, wherein the at least one hollow comprises a pair of longitudinally extending hollows positioned such that the respective reflector planes of each such hollow extend substantially parallel to one another. 26. The light fixture of claim 20, wherein the reflector assembly comprises at least one end face forming an obtuse angle with respect to the longitudinal axis of the reflector assembly. 27. The light fixture of claim 20, wherein the portions of the hollow extending between the central portion and the respective first and second hollow edges of the hollow form a generally curved reflective surface. 28. The light fixture of claim 20, wherein the central portion of the at least one hollow is symmetrically formed with respect to the first hollow edge and the second hollow edge, and wherein the central portion of the at least one hollow defines a longitudinally extending trough that extends inwardly away from the surface of the hollow. 29. A light fixture for a light fixture that is mountable in relation to a ceiling plane, comprising: a) lens assembly comprising: i) an elongate lens extending along a lens longitudinal axis and having a central lens portion curved in a plane transverse to the lens longitudinal axis that defines a prismatic face that is oriented toward and spaced from said light source and an opposed, substantially smooth, exterior surface; and ii) a means for generating a plurality of spaced elongate stripes of reduced brightness on the exterior surface of the lens to control high angle glare in the longitudinal direction optically comprising a plurality of adjoining elongate prismatic elements formed on the prismatic face of the central lens portion that extend parallel to said lens longitudinal axis, wherein each prismatic element has a curved surface facing said light source, wherein each pair of adjoining elongate prismatic elements form a common elongate cusp edge, wherein each elongate prismatic element of the plurality of adjoining elongate prismatic elements is configured such that a reverse ray impacting the elongate prismatic element proximate the common cusp edge at an angle of incidence ω of at least about 40° will undergo total internal reflection and be reflected back into the area to be illuminated to form a stripe of reduced brightness on the exterior surface of the lens, and wherein each stripe of reduced brightness extends substantially parallel to the lens longitudinal axis; and b) a reflector assembly comprising at least one longitudinally extending hollow having a longitudinal axis, a longitudinally extending first hollow edge and a longitudinally extending spaced second hollow edge, at least a portion of a cross-section of the hollow normal to said longitudinal axis having a generally curved shape, said hollow comprising a plurality of longitudinally extending ridges comprising a first surface and an adjoining second surface, wherein each ridge has an asymmetric shape in which the second surface thereof has a cross-sectional length which is less than the cross-sectional length of the first surface, wherein each first surface is positioned at a first angle relative to a reflector plane that bisects the longitudinal axis of the hollow normal to the ceiling plane, and wherein the second surface of each respective ridge is positioned closer to the reflector plane than is the first surface of each respective ridge. 30. The light fixture of claim 29, wherein the first angle is an acute angle and each first surface faces substantially inwardly toward the reflector plane. 31. The light fixture of claim 30, wherein each second surface is positioned at a second angle relative to the reflector plane that is greater than the first angle of an adjoining first surface relative to the reflector plane. 32. The light fixture of claim 31, wherein the second angle of the second surfaces of a first portion of the plurality of male ridges is an acute angle such that the respective second surfaces of said first portion of the plurality of male ridges face substantially inwardly toward the reflector plane. 33. The light fixture of claim 32, wherein the second angle of the second surface of a second portion of the plurality of male ridges is an obtuse angle such that the respective second surfaces of said second portion of the plurality of male ridges face substantially outwardly relative to the reflector plane. 34. The light fixture of claim 29, wherein the cross-sectional length of the second surface is between about 30 and 50 percent of the cross-sectional length of the first surface. 35. The light fixture of claim 29, wherein the plurality of male ridges comprises a pair of opposed sets of male ridges. 36. The light fixture of claim 35, wherein the pair of opposed sets of male ridges comprises a first set of male ridges and an opposed second set of male ridges, wherein the respective first and second sets of male ridges extend outwardly, in opposed directions, radially about the longitudinal axis of the reflector assembly and toward a respective one of the respective first and second hollow edges. 37. The light fixture of claim 34, wherein the first set of ridges is a substantially mirrored image of the second set of ridges. 38. The light fixture of claim 29, wherein the at least one longitudinally extending hollow comprises a pair of longitudinally extending hollows positioned such that the reflector plane of each of said hollows extends substantially parallel to one another. 39. The light fixture of claim 29, wherein the reflector assembly comprises at least one end face forming an obtuse angle with respect to the longitudinal axis of the reflector assembly. 40. The light fixture of claim 29, wherein the at least one hollow extends inwardly toward a central portion defined by and between the respective first and second hollow edges, and wherein the portions of the hollow extending between the central portion and the respective first and second hollow edges form a generally curved reflective surface. 41. The light fixture of claim 29, wherein the central portion is positioned symmetrically with respect to the first and second hollow edges and defines a longitudinally extending trough extending away from the surface of the hollow. 42. A light fixture, comprising: a reflector assembly comprising at least one longitudinally extending hollow, said longitudinally extending hollow comprising a plurality of longitudinally extending male ridges, wherein each ridge has a first surface and an adjoining second surface; a light source configured for mounting within a portion of the longitudinally extending hollow; a means for controlling the light generated from the light source that is incident on the respective first and the second surfaces of the plurality of longitudinally extending male ridges to form at least one longitudinally extending shadow in the reflector assembly, wherein each longitudinally extending shadow has the appearance of a dark stripe to an external viewer; and a lens assembly, comprising: i) an elongate lens extending along a lens longitudinal axis and having a central lens portion curved in a plane transverse to the lens longitudinal axis that defines a prismatic face that is oriented toward and spaced from said light source and an opposed, substantially smooth, exterior surface; and ii) a means for generating a plurality of spaced elongate stripes of reduced brightness to control high angle glare in the longitudinal direction optically, comprising a plurality of adjoining elongate prismatic elements formed on the prismatic face of the central lens portion that extend parallel to said lens longitudinal axis, wherein each prismatic element has a curved surface facing said light source, wherein each pair of adjoining elongate prismatic elements form a common elongate cusp edge, wherein each elongate prismatic element of the plurality of adjoining elongate prismatic elements is configured such that a reverse ray impacting the elongate prismatic element proximate the common cusp edge at an angle of incidence ω of at least about 40° will undergo total internal reflection and be reflected back into the area to be illuminated to form a stripe of reduced brightness on the exterior surface of the lens, and wherein each stripe of reduced brightness extends substantially parallel to the lens longitudinal axis.
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