Free-form lens design for LED indoor illumination

Kuang Lung Huang, Jin-Jia Chen, Te Yuan Wang, Li Lin Huang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

This paper presents a free-form lens design for indoor illumination. The lens consists of a TIR (total internal reflection) surface on the sidewall, a refractive surface on the front side, and a concave surface on the rear side. The TIR surface is decorated with a free-form profile that light rays emitted from the LED with a larger spread angle to the axis will experience a total internal refection and output from the front refractive surface. While the central part of the front refractive surface has a convex surface that makes light rays closing to the optical axis more evenly distributed. The purpose of the rear concave surface is to let light rays emitted from the LED enter the lens straightforwardly. With this lens light rays from a Lambertian-type LED light source can be redistributed so that a uniform illumination can be achieved. The optical simulation results show that the measured optical efficiency is 75% while the uniformity is 80% on a target plane of 6-m diameter and at 2.5-m away.

Original languageEnglish
Title of host publicationLED and Display Technologies
Volume7852
DOIs
Publication statusPublished - 2010 Dec 1
EventLED and Display Technologies - Beijing, China
Duration: 2010 Oct 182010 Oct 19

Other

OtherLED and Display Technologies
CountryChina
CityBeijing
Period10-10-1810-10-19

Fingerprint

Lens Design
lens design
Light emitting diodes
Illumination
Lenses
light emitting diodes
Lighting
illumination
Half line
rays
Lens
Total Internal Reflection
lenses
Convex Surface
Uniformity
closing
Light sources
light sources
Internal
Angle

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Huang, K. L., Chen, J-J., Wang, T. Y., & Huang, L. L. (2010). Free-form lens design for LED indoor illumination. In LED and Display Technologies (Vol. 7852). [78521D] https://doi.org/10.1117/12.870647
Huang, Kuang Lung ; Chen, Jin-Jia ; Wang, Te Yuan ; Huang, Li Lin. / Free-form lens design for LED indoor illumination. LED and Display Technologies. Vol. 7852 2010.
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Huang, KL, Chen, J-J, Wang, TY & Huang, LL 2010, Free-form lens design for LED indoor illumination. in LED and Display Technologies. vol. 7852, 78521D, LED and Display Technologies, Beijing, China, 10-10-18. https://doi.org/10.1117/12.870647

Free-form lens design for LED indoor illumination. / Huang, Kuang Lung; Chen, Jin-Jia; Wang, Te Yuan; Huang, Li Lin.

LED and Display Technologies. Vol. 7852 2010. 78521D.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - This paper presents a free-form lens design for indoor illumination. The lens consists of a TIR (total internal reflection) surface on the sidewall, a refractive surface on the front side, and a concave surface on the rear side. The TIR surface is decorated with a free-form profile that light rays emitted from the LED with a larger spread angle to the axis will experience a total internal refection and output from the front refractive surface. While the central part of the front refractive surface has a convex surface that makes light rays closing to the optical axis more evenly distributed. The purpose of the rear concave surface is to let light rays emitted from the LED enter the lens straightforwardly. With this lens light rays from a Lambertian-type LED light source can be redistributed so that a uniform illumination can be achieved. The optical simulation results show that the measured optical efficiency is 75% while the uniformity is 80% on a target plane of 6-m diameter and at 2.5-m away.

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Huang KL, Chen J-J, Wang TY, Huang LL. Free-form lens design for LED indoor illumination. In LED and Display Technologies. Vol. 7852. 2010. 78521D https://doi.org/10.1117/12.870647