Design of a newly projected light-emitting diode low-beam headlamp based on microlenses

Hong Wang; Xiang Wang; Yang Li; Peng Ge

doi:10.1364/AO.54.001794

Applied Optics
Vol. 54,
Issue 7,
pp. 1794-1801
(2015)
•https://doi.org/10.1364/AO.54.001794

Design of a newly projected light-emitting diode low-beam headlamp based on microlenses

Hong Wang, Xiang Wang, Yang Li, and Peng Ge

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Hong Wang, Xiang Wang, Yang Li, and Peng Ge, "Design of a newly projected light-emitting diode low-beam headlamp based on microlenses," Appl. Opt. 54, 1794-1801 (2015)

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Abstract

We propose a newly projected LED low-beam headlamp based on microlenses. The low-beam headlamp consists of four LEDs, four reflectors, and four microlenses. It does not need a baffle to form the cut-off line. Simulation results show that our proposed low-beam design can satisfy United Nations Economic Commission for Europe vehicle regulations (ECE) R112. The structure of our system is simple and easy to fabricate. Optical efficiency of the system can reach up to 80%, which is much higher than the traditional low-beam lamp design.

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Equations (13)

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Point on Measuring Screen	Required Illumination in Lux	Simulated Illumination in Lux
HV	$\leq 0.7$	0.46
Point B 50L	$\leq 0.4$	0.26
Point 75R	$\geq 12$	13.46
Point 75L	$\leq 12$	2.52
Point 50L	$\leq 15$	4.73
Point 50R	$\geq 12$	28.16
Point 50V	$\geq 6$	7.14
Point 25 L	$\geq 2$	11.83
Point 25R	$\geq 2$	15.64
Any point in zone I	$\leq 2 E^{*}$	OK
Any point in zone III	$\leq 0.7$	OK
Any point in zone IV	$\geq 3$	OK

Point on Measuring Screen	Required Illumination in Lux	Simulated Illumination in Lux
HV	$\leq 0.7$	0.575
Point B50L	$\leq 0.4$	0.0642
Point 75R	$\geq 12$	22.23
Point 75L	$\leq 12$	1.697
Point 50L	$\leq 15$	3.772
Point 25L	$\geq 12$	18.38
Point 50V	$\geq 6$	19.31
Point 50R	$\geq 2$	51.1
Point 25R	$\geq 2$	34.11
Any point in zone I	$\leq 2 E^{*}$	$\leq 91.6$
Any point in zone III	$\leq 0.7$	$Max [III] \leq 0.575$
Any point in zone IV	$\geq 3$	$Min [IV] \geq 3.758$

Point on Measuring Screen	Required Illumination in Lux	Simulated Illumination in Lux
HV	$\leq 0.7$	0.654
Point B50L	$\leq 0.4$	0.052
Point 75R	$\geq 12$	17.98
Point 75L	$\leq 12$	0.739
Point 50L	$\leq 15$	4.381
Point 25L	$\geq 12$	20.21
Point 50V	$\geq 6$	17.23
Point 50R	$\geq 2$	48.54
Point 25R	$\geq 2$	29.31
Any point in zone I	$\leq 2 E^{*}$	$\leq 87.07$
Any point in zone III	$\leq 0.7$	$Max [III] \leq 0.654$
Any point in zone IV	$\geq 3$	$Min [IV] \geq 4.381$

Point on Measuring Screen	Required Illumination in Lux	Simulated Illumination in Lux
HV	$\leq 0.7$	0.46
Point B 50L	$\leq 0.4$	0.26
Point 75R	$\geq 12$	13.46
Point 75L	$\leq 12$	2.52
Point 50L	$\leq 15$	4.73
Point 50R	$\geq 12$	28.16
Point 50V	$\geq 6$	7.14
Point 25 L	$\geq 2$	11.83
Point 25R	$\geq 2$	15.64
Any point in zone I	$\leq 2 E^{*}$	OK
Any point in zone III	$\leq 0.7$	OK
Any point in zone IV	$\geq 3$	OK

Point on Measuring Screen	Required Illumination in Lux	Simulated Illumination in Lux
HV	$\leq 0.7$	0.575
Point B50L	$\leq 0.4$	0.0642
Point 75R	$\geq 12$	22.23
Point 75L	$\leq 12$	1.697
Point 50L	$\leq 15$	3.772
Point 25L	$\geq 12$	18.38
Point 50V	$\geq 6$	19.31
Point 50R	$\geq 2$	51.1
Point 25R	$\geq 2$	34.11
Any point in zone I	$\leq 2 E^{*}$	$\leq 91.6$
Any point in zone III	$\leq 0.7$	$Max [III] \leq 0.575$
Any point in zone IV	$\geq 3$	$Min [IV] \geq 3.758$

Abstract

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Figures (17)

Tables (3)

Equations (13)

Applied Optics