Light fixture and lens assembly for same
First Claim
1. A lens assembly 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, the lens assembly comprising:
- 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
a means for controlling the total internal reflection of a plurality of reverse rays impacting the prismatic face of the elongate lens to generate a plurality of spaced elongate stripes of reduced brightness that extend substantially parallel to the lens longitudinal axis, wherein the means for controlling the total internal reflection of the plurality of reverse rays controls high angle glare in the longitudinal direction optically.
2 Assignments
0 Petitions
Accused Products
Abstract
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. In one example, the lens includes a curved prismatic surface that can be oriented toward or away from the underlying light source.
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Citations
49 Claims
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1. A lens assembly 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, the lens assembly comprising:
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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 a means for controlling the total internal reflection of a plurality of reverse rays impacting the prismatic face of the elongate lens to generate a plurality of spaced elongate stripes of reduced brightness that extend substantially parallel to the lens longitudinal axis, wherein the means for controlling the total internal reflection of the plurality of reverse rays controls high angle glare in the longitudinal direction optically. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A lens assembly for directing light emitted from a light source toward an area desired to be illuminated, the light source being elongated along a light source longitudinal axis, the lens assembly comprising:
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an elongated lens having a first end edge, an opposed second end edge, a central lens portion that extends between the first and second end edges, and a lens longitudinal axis that is generally parallel to the light source longitudinal axis, the central lens portion being curved in a plane transverse to the light source longitudinal axis and being symmetric about a plane that extends through the light source longitudinal axis, wherein the central lens portion has a prismatic surface that defines a face oriented toward and spaced from the light source and an opposed, substantially smooth, exterior surface; and a means for controlling the total internal reflection of a plurality of reverse rays impacting the prismatic face of the elongate lens to generate a plurality of spaced elongate stripes of reduced brightness that extend substantially parallel to the lens longitudinal axis and substantially between the first and second end edges of the lens, wherein the means for controlling the total internal reflection of the plurality of reverse rays controls high angle glare in the longitudinal direction optically. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A light fixture for directing light toward an area desired to be illuminated, comprising:
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a reflector assembly comprising an elongated base member having a base longitudinal axis; a linear light source for generating the light, the light source being elongated along a light source longitudinal axis and being operatively supported by the base member; and a lens assembly comprising; a) an elongated lens having a curved central lens portion that extends generally parallel to the light source longitudinal axis and is symmetric about a plane that extends through the light source longitudinal axis, the central lens portion having an substantially smooth exterior surface and an opposed prismatic surface that defines a concave face spaced from and facing the light source, wherein the lens assembly is constructed and arranged for detachable connection to a portion of the base member of the reflector assembly, and wherein the lens has a lens longitudinal axis extending between the first and second end edges of the lens; and a means for controlling the total internal reflection of a plurality of reverse rays impacting the prismatic face of the elongate lens to generate a plurality of spaced elongate stripes of reduced brightness that extend substantially parallel to the lens longitudinal axis, wherein the means for controlling the total internal reflection of the plurality of reverse rays controls high angle glare in the longitudinal direction optically. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification