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Proceedings Paper

Off-axis TIR lens for conformal luminaires
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Paper Abstract

For reasons both fluid-dynamic and stylistic, volumetric constraints on vehicular luminaires grow more exacting. For full design-freedom of luminaire placement and shape, new designs are needed that have shallow depth and are capable of emitting a beam that makes a net angle with the local surface normal. Automotive headlamps, fog-lamps, and daylight-running lamps may need to project their illumination patterns onto the road from a position on sloped front surfaces. A conventional paraboloid, however, must be recessed behind a sloped window, thus using up space inside the vehicle-skin. A conventional TIR lens, with its output beam centered on its axis of circular symmetry, will also have to intrude into the vehicle interior, and shine through a sloped window. Instead, the luminaire should be thin enough to mount on a vehicle’s skin without needing a hole to be cut into it, a luminaire also capable of emitting its beam substantially off the local normal. To this end, two new TIR lenses are introduced here that generate off-normal beams. In one, a circular TIR lens takes on an internal tilt of its symmetry axis to produce a collimated output beam with high tilt, nearly 45° from the surface normal of the lens exterior. In the other, an off-axis linear TIR lens can be made with an internal tilt to the reflected rays. When used with LEDs, this new linear lens can be combined with exterior transverse lenslets, tailored to meet an intensity prescription.

Paper Details

Date Published: 12 November 2003
PDF: 5 pages
Proc. SPIE 5186, Design of Efficient Illumination Systems, (12 November 2003); doi: 10.1117/12.507827
Show Author Affiliations
William A. Parkyn, Light Prescriptions Innovators, LLC (United States)
Waqidi Falicoff, Light Prescriptions Innovators, LLC (United States)
Juan C. Minano, Light Prescriptions Innovators, LLC (United States)
Pablo Benitez, Light Prescriptions Innovators, LLC (United States)
Julio Chavez, Light Prescriptions Innovators, LLC (United States)
Yupin Sun, Light Prescriptions Innovators, LLC (United States)

Published in SPIE Proceedings Vol. 5186:
Design of Efficient Illumination Systems
R. John Koshel, Editor(s)

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