Off-axis TIR lens for conformal luminaires

William A. Parkyn; Waqidi Falicoff; Juan C. Minano; Pablo Benitez; Julio Chavez; Yupin Sun

doi:10.1117/12.507827

12 November 2003 Off-axis TIR lens for conformal luminaires

William A. Parkyn, Waqidi Falicoff, Juan C. Minano, Pablo Benitez, Julio Chavez, Yupin Sun

Proceedings Volume 5186, Design of Efficient Illumination Systems; (2003) https://doi.org/10.1117/12.507827
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

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.

Citation Download Citation

William A. Parkyn, Waqidi Falicoff, Juan C. Minano, Pablo Benitez, Julio Chavez, and Yupin Sun "Off-axis TIR lens for conformal luminaires", Proc. SPIE 5186, Design of Efficient Illumination Systems, (12 November 2003); https://doi.org/10.1117/12.507827

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KEYWORDS

Light emitting diodes

Beam shaping

Collimation

Headlamps

Lamps

Lens design

Patents

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