Patent ID: 7959322

Claim:
An optical system for an array of LED lamps, each said lamp comprising a die from which light is emitted in a hemispherical pattern surrounding an optical axis originating at said die, said lamps arranged along a line extending through said dies to form a linear array having a length, said optical system comprising: a reflector including a pair of reflecting surfaces laterally spaced from and parallel to said linear array, each said reflecting surface having a lower portion defined by intersecting circular parabolic surfaces, each said circular parabolic surface centered on the optical axis of one of said lamps and an upper portion defined by a linear surface extending axially above said lower portion and laterally away from the optical axes of said lamps; and a lens extending the length of said linear array and positioned axially above said linear array and between said reflecting surfaces, said lens having a central region intersected by the optical axes of said lamps and opposed side regions separated by said central region, said central region configured to refract light from said lamps into a direction generally parallel to a first plane including the optical axes of said lamps, said outer side regions each defined by a receiving surface configured to refract light from said lamps into said lens, an internal reflecting surface arranged to reflect light refracted by said receiving surface into said direction generally parallel to said first plane and an emission surface through which said reflected light passes; wherein each of said central region, side regions, upper portions and lower portions are arranged to redirect light from said lamps emitted at a predetermined range of angles with respect to said first plane, said predetermined ranges traversing an arc of approximately 180° in a direction perpendicular to and centered on said first plane, the predetermined range of angles of light redirected by said upper portions and lower portions of said reflector being separated from said first plane by an angle traversed by the predetermined range of angles of light passing through said central and side regions of said lens.