Optical: systems and elements – Signal reflector – For a signal source remote from observer
Patent
1989-06-29
1991-09-10
Arnold, Bruce Y.
Optical: systems and elements
Signal reflector
For a signal source remote from observer
362269, 359534, 359515, G02B 512, F21V 2126
Patent
active
050468189
ABSTRACT:
An optical system is provided for traffic signal devices. The optical system includes an illuminating source for emitting light; a prismatic reflector for receiving and reflecting the emitted light; and a lens for receiving and for redirecting the reflected emitted light. The illuminating source and the reflector are aligned along a first axis that is vertically inclined relative to a central horizontal axis of the traffic signal device in a range between approximately 2 degrees and 4 degrees. The reflector has a substantially parabolic contour and has a plurality of substantially vertical critical angle prisms formed on an outside surface of the reflector. The prism have included angles of greater than 90 degrees but less than or equal to 95 degrees, or included angles of greater than or equal to 85 degrees but less than 90 degrees. The prisms are arranged to have included angles sequentially increasing from a first predetermined included angle proximate to the illumination source to a second predetermined included angle proximate to the lens. The traffic signal device includes a housing and the lens has an outer face spaced exterior from the housing allowing a portion of the reflector to extend within the lens outside the housing.
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Institute of Transportation Engineers, "Vehicle Traffic Control Signal Heads", 1985, pp. 5-11.
Arnold Bruce Y.
Lexalite Corporation
Phan James
LandOfFree
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