Improvement of disturbing color effects depending on the axial color of an automotive headlamp lens

Hyun Soo Lee; Hyun Jung Park; Joon Seop Kwak

doi:10.1364/AO.56.005106

Applied Optics
Vol. 56,
Issue 17,
pp. 5106-5111
(2017)
•https://doi.org/10.1364/AO.56.005106

Improvement of disturbing color effects depending on the axial color of an automotive headlamp lens

Hyun Soo Lee, Hyun Jung Park, and Joon Seop Kwak

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Hyun Soo Lee, Hyun Jung Park, and Joon Seop Kwak, "Improvement of disturbing color effects depending on the axial color of an automotive headlamp lens," Appl. Opt. 56, 5106-5111 (2017)

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Related Topics
Table of Contents Category
- Optical Design and Fabrication
Optics & Photonics Topics
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The topics in this list come from the Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Aberrations (global) (220.1010)
- Illumination design (220.2945)
- Light-emitting diodes (230.3670)

About this Article
History
- Original Manuscript: April 5, 2017
- Revised Manuscript: May 20, 2017
- Manuscript Accepted: May 21, 2017
- Published: June 9, 2017

Abstract

Light-emitting diodes (LEDs) are causing big changes in the automotive lighting field. Optical systems with LEDs can use a plastic lens, which means almost all shapes can be made through plastic injection molding. Already, some car manufacturers are adopting this technology in their designs to express their own identities to customers. However, to use this technology, an important defect has to be overcome, which is color aberration near the cutoff line of the low-beam. In this paper, the criteria for measuring the color coordinates are established and simulations for axial color aberration in the plastic lens are carried out.

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Type	Glass (BK7)	PMMA	PC
Abbe number	58	50	30
Refractive index	1.523	1.491	1.586
Coefficient of linear expansion	$3.5 \times 10^{- 7}$	$6.67 \times 10^{- 5}$	$6.6 \times 10^{- 5}$
Transmittance	88%	92%	89%
Thermostability	600°C	95°C	150°C

	Required Luminous Intensity (Class B Headlamp)
Test Points	Min. (cd)	Max. (cd)	Simulation Result (cd)
B50L	—	350	0
BR	—	1750	0
75L	10,100	—	45,557
75L	—	10,600	4367
50L	—	18,600	11,791
50R	10,100	—	36,459
50 V	5100	—	36,834
25L	1700	—	4367
25R	1700	—	2946
Zone 3	—	625	58
Zone 4	2500	—	6515
Zone 1	—	50R*2	4367

		Color Coordinate		Standard Deviation
No.	Test Point	$x$	$y$	$x$	$y$
1	75R	0.3183	0.3271	0.0065	0.0011
2	50L	0.3497	0.3698	0.013	0.0021
3	50R	0.3197	0.3181	0.0083	0.0012
4	50V	0.3308	0.3426	0.0087	0.0055
5	25L	0.3199	0.3317	0.0035	0.0041
6	25R	0.3260	0.3379	0.0033	0.0037

Type	Glass (BK7)	PMMA	PC
Abbe number	58	50	30
Refractive index	1.523	1.491	1.586
Coefficient of linear expansion	$3.5 \times 10^{- 7}$	$6.67 \times 10^{- 5}$	$6.6 \times 10^{- 5}$
Transmittance	88%	92%	89%
Thermostability	600°C	95°C	150°C

	Required Luminous Intensity (Class B Headlamp)
Test Points	Min. (cd)	Max. (cd)	Simulation Result (cd)
B50L	—	350	0
BR	—	1750	0
75L	10,100	—	45,557
75L	—	10,600	4367
50L	—	18,600	11,791
50R	10,100	—	36,459
50 V	5100	—	36,834
25L	1700	—	4367
25R	1700	—	2946
Zone 3	—	625	58
Zone 4	2500	—	6515
Zone 1	—	50R*2	4367

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