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US 6,601,970 B2Granted
Linear lighting system
AssigneeKyoto Denkiki Co., Ltd.
InventorsHiroshi Ueda, Kunio Kuroda, Yuzo Nakayama
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AssigneeKyoto Denkiki Co., Ltd.
InventorsHiroshi Ueda, Kunio Kuroda, Yuzo Nakayama
Estimating the term…
The present invention relates to a linear lighting system with a linear light source. According to the invention, all the effective light around the optical axis emitted from the linear light source is introduced to a concave reflector so that the illumination is carried out only with the reflected light. The reflected light is controlled to be a converging or parallel beam of light so that a desired area is illuminated and the luminance is increased. In a mode of the invention, a cylindrical concave reflector 2 whose section taken vertical to a linear light source 1 is a part of an ellipse 2e having a first focus F1 at the linear light source 1 and a second focus F2 at an irradiation plane 3 (irradiation target point). The part of the ellipse covers an effective emission angle 2θ of the linear light source 1, and a reflected light produced at the part from a light within the effective emission angle 2θ is free of obstruction by the linear light source 1. In another mode, the cylindrical concave reflector 2 is a part of a parabola having a focus at the linear light source 1. The part of the parabola covers an effective emission angle 2θ of the linear light source 1, and a reflected light produced at the part from a light within the effective emission angle 2θ is free of obstruction by the linear light source 1.
A linear lighting system for converging light on a linear portion including a linear light source emitting light mostly in an effective emission angle and a concave reflector having a cylindrical concave surface, which is characterized in that a section of the concave surface, taken vertical to the linear light source, is part of an ellipse having a first focus at the linear light source and a second focus at a point of the linear portion, where the part of the ellipse covers the effective emission angle of the linear light source and a reflected light produced at the part from a light within the effective emission angle is free of obstruction by the linear light source.
A linear lighting system including a linear light source and a concave reflector having a cylindrical concave surface, which is characterized in that a section of the concave surface, taken vertical to the linear light source, is part of a parabola having a focus at the linear light source, where the part of the parabola covers an effective emission angle of the linear light source and a reflected light produced at the part from a light within the effective emission angle is free of obstruction by the linear light source.
Dependencies are inferred from the claim text.