Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

Lens for uniform LED illumination: an example of automated optimization using Monte Carlo ray-tracing of an LED source

[+] Author Affiliations
Benjamin A. Jacobson, Robert D. Gengelbach

Illumitech Inc. (USA)

Proc. SPIE 4446, Nonimaging Optics: Maximum Efficiency Light Transfer VI, 121 (November 19, 2001); doi:10.1117/12.448810
Text Size: A A A
From Conference Volume 4446

  • Nonimaging Optics: Maximum Efficiency Light Transfer VI
  • Roland Winston
  • San Diego, CA, USA | July 29, 2001

abstract

We present preliminary results of optimizing a T1 LED integral dome lens for efficient and uniform illumination. The automated optimization process is based on a geometrical model of the LED die radiation inside the encapsulant. A commercial nonsequential ray-tracing program is combined with an external global optimization engine to maximize both efficiency and uniformity. The LED model is based on surface radiance images of an LED package sectioned with a diamond saw, and validated by comparison to measured near-field irradiance patterns. The resulting lens design is compared with the original design based on calculated irradiance patterns. The optimized lens substantially improves calculated uniformity, and somewhat improves efficiency, at the expense of a more complex lens profile, including multiple ripples on the surface. Robustness of the new design is evaluated by ray-tracing the lens with the LED displaced by typical manufacturing tolerances for low-cost LED's, resulting in significantly degraded uniformity. The results are still better than the original dome lens, but clearly indicate that manufacturing variabilities may place an upper bound on the uniformity achievable, at least with our preliminary approach.

© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Benjamin A. Jacobson and Robert D. Gengelbach
"Lens for uniform LED illumination: an example of automated optimization using Monte Carlo ray-tracing of an LED source", Proc. SPIE 4446, Nonimaging Optics: Maximum Efficiency Light Transfer VI, 121 (November 19, 2001); doi:10.1117/12.448810; http://dx.doi.org/10.1117/12.448810


Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.