Illumination-redistribution lenses for non-circular spots

William A. Parkyn; David G. Pelka

doi:10.1117/12.619145

8 September 2005 Illumination-redistribution lenses for non-circular spots

William A. Parkyn, David G. Pelka

Proceedings Volume 5942, Nonimaging Optics and Efficient Illumination Systems II; 594208 (2005) https://doi.org/10.1117/12.619145
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The design of illumination lenses is far easier under the regime of the small-source approximation, whereby central rays are taken as representative of the entire source. This implies that the lens is much larger than the source's active emitter, and its entire interior surface is nowhere close to the source. Also, a given source luminance requires a minimum lens area to achieve the candlepower necessary for target illumination. We introduce two-surface aspheric lenses for specific illuminations tasks involving ceiling-mounted downlights, lenses that achieve uniform illuminance at the output aperture as well as at the target. This means that squared-off lenses will produce square spots. In particular, a semicircular lens and a vertical mirror will produce a semicircular spot suitable for gambling tables.

Citation Download Citation

William A. Parkyn and David G. Pelka "Illumination-redistribution lenses for non-circular spots", Proc. SPIE 5942, Nonimaging Optics and Efficient Illumination Systems II, 594208 (8 September 2005); https://doi.org/10.1117/12.619145

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available