LED retrofit lens for fluorescent tube
First Claim
1. A lens, comprising:
- an elongated body having a hemispherical cross-section running along a longitudinal axis, said body comprising at least one light entry surface, at least one exit surface, and two or more mount surfaces defining a mounting plane, wherein said two or more mount surfaces contact an upper surface of a reflective base, wherein at least one light source is also mounted on said upper surface of said reflective base;
wherein said body is shaped to redirect at least some light from said at least one light source that impinges said light entry surface in a direction away from a normal axis that is perpendicular to said mounting plane, wherein the width of said reflective base is equal to or greater than the width of said elongated body.
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Accused Products
Abstract
Light fixtures having light bar elements therein. In order to mimic the size and appearance of fluorescent bulbs in existing troffer-style and surface-mount fixtures, LEDs are may be arranged on light bars with integrated lenses to both diffuse the light and shape the output beam. One or more LEDs can be mounted, sometimes in clusters, along the length of a base of the light bar which can then be inserted into a fixture. An elongated lens is mounted to the base over the LEDs so that light emitted from the LEDs interacts with the lens before it escapes the fixture. These elongated lenses may be extruded from a diffusive material, for example, and can be shaped in various ways. For example, the lenses may be shaped to disperse more light to the sides, i.e., in a direction away from a normal axis that is perpendicular to the base.
194 Citations
24 Claims
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1. A lens, comprising:
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an elongated body having a hemispherical cross-section running along a longitudinal axis, said body comprising at least one light entry surface, at least one exit surface, and two or more mount surfaces defining a mounting plane, wherein said two or more mount surfaces contact an upper surface of a reflective base, wherein at least one light source is also mounted on said upper surface of said reflective base; wherein said body is shaped to redirect at least some light from said at least one light source that impinges said light entry surface in a direction away from a normal axis that is perpendicular to said mounting plane, wherein the width of said reflective base is equal to or greater than the width of said elongated body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light bar, comprising:
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an elongated reflective base running along a longitudinal axis and defining a normal axis perpendicular to said base; at least one light emitter on an upper surface of said base; and an elongated lens in contact with said upper surface of said base surrounding said at least one light emitter, such that light from said at least one light emitter impinges on said lens, said lens shaped to redirect at least some light from said at least one emitter away from said normal axis, wherein said upper surface of said base extends beyond the width of said lens. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A light fixture, comprising:
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a fixture housing; at least one light bar attached to said housing, each of said light bars comprising; an elongated reflective base running along a longitudinal axis and defining a normal axis perpendicular to said base; at least one light emitter on said base; and an elongated lens on said base surrounding said at least one light emitter, such that light from said at least one light emitter impinges on said lens, said lens shaped to redirect at least some light from said at least one emitter away from said normal axis, wherein the width of said reflective base is equal to or greater than the width of said elongated lens; and a control circuit to control said at least one light emitter. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification