Illumination – Supported by vehicle structure – Condition responsive
Patent
1985-10-02
1987-07-21
Corbin, John K.
Illumination
Supported by vehicle structure
Condition responsive
362311, G02B 504, F21V 300, F21V 500
Patent
active
046814027
ABSTRACT:
A method and means for projecting a secondary rainbow of natural configuration comprising an arcuate prism of greater than about 180.degree. of arc and optionally an arcuate prism orienting means. The primary and secondary refractive surfaces of arcuate prism are oriented such that they meet along the edge of said arcuate prism closest to that point at the center of said arc. The angle formed by the primary and secondary refractive surfaces of said arcuate prism are from about 25.degree. to about 75.degree., the "active range". When the prism is of polymethyl methacrylate (such as lucite) the refractive surfaces subtend an angle of greater than about 35.degree. and less than about 65.degree., the "particular active range". Prisms within the active range provide for the projection of a secondary rainbow of natural configuration when a light course of generally parallel rays of light is oriented at a position from less than about 30.degree. from perpendicular relative to a plane through the interior edge of the prism. Prism materials of high indicies of refraction will project secondary rainbows from a point where incident light forms an angle of less than about 30.degree.. This constitutes the maximum effective angular range.
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Corbin John K.
Lemmo Vincent J.
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