Limits...
Reflective optics design for an LED high beam headlamp of motorbikes.

Ge P, Wang X, Li Y, Wang H - ScientificWorldJournal (2015)

Bottom Line: We set the measuring screen as an elliptical zone and divide it into many small lattices and divide the spatial angle of the LED source into many parts and make relationships between them.According to the conservation law of energy and the Snell's law, the reflector is generated by freeform optics design method.Experiment results can fully comply with United Nations Economic Commission for Europe (ECE) vehicle regulations R113 revision 2 (Class C).

View Article: PubMed Central - PubMed

Affiliation: Engineering Research Center for Optoelectronics of Guangdong Province, School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China.

ABSTRACT
We propose a reflective optics design for an LED motorbike high beam lamp. We set the measuring screen as an elliptical zone and divide it into many small lattices and divide the spatial angle of the LED source into many parts and make relationships between them. According to the conservation law of energy and the Snell's law, the reflector is generated by freeform optics design method. Then the optical system is simulated by Monte Carlo method using ASAP software. Light pattern of simulation could meet the standard. The high beam headlamp is finally fabricated and assembled into a physical object. Experiment results can fully comply with United Nations Economic Commission for Europe (ECE) vehicle regulations R113 revision 2 (Class C).

No MeSH data available.


Related in: MedlinePlus

Entity and size of the high beam's reflector.
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fig7: Entity and size of the high beam's reflector.

Mentions: In Figure 5(a), α is the angle between the z-axis and the line which crosses the center of the LED source and the edge of the reflector. We consider rays with angle θj as an example. Because the reflector is symmetrical with z-axis, we only consider θj ∈ [0, π/2]. φi represents the angle between the z-axis and the ith ray hitting on the reflector, in which φi ∈ [α, π/2]. Lθj means the distance between the center of the LED source and the point on the reflector when z coordinate is equal to zero. r(i)θj in Figure 5(b) means the distance between the center of the target plane and the edge point corresponding to the rays with angle φi and θj. We obtained (9)riθ0=ai,riθj=aibibi2cos⁡2θj+ai2sin2θj.In the calculation process, we should initialize the parameters, such as the aperture of the bottom margin of the trapezium. We set semimajor axis a = 6, semiminor axis b = 2, h = 25, Lθj = 0.0048, φ0 = π/2, and α = 0.4189. And we set ϕi = α as the terminal condition of the iteration process. The margin curves of the reflector can be fixed according to the initial points, as shown in Figure 6(a). Then the whole freeform surface can be calculated according to the points on the margin curves. The surface of the reflector can be generated by lofting the discrete points introduced into the mechanical modeling software, as shown in Figure 6(b). By mirror imaging, we get the whole reflector as shown in Figure 6(c). Figure 6(d) shows the whole freeform curves on the reflector. Finally the entity and the size of the reflector are as shown in Figure 7. The height of the reflector is 43.5 mm, and the aperture of the reflector is 38.62 mm.


Reflective optics design for an LED high beam headlamp of motorbikes.

Ge P, Wang X, Li Y, Wang H - ScientificWorldJournal (2015)

Entity and size of the high beam's reflector.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4414011&req=5

fig7: Entity and size of the high beam's reflector.
Mentions: In Figure 5(a), α is the angle between the z-axis and the line which crosses the center of the LED source and the edge of the reflector. We consider rays with angle θj as an example. Because the reflector is symmetrical with z-axis, we only consider θj ∈ [0, π/2]. φi represents the angle between the z-axis and the ith ray hitting on the reflector, in which φi ∈ [α, π/2]. Lθj means the distance between the center of the LED source and the point on the reflector when z coordinate is equal to zero. r(i)θj in Figure 5(b) means the distance between the center of the target plane and the edge point corresponding to the rays with angle φi and θj. We obtained (9)riθ0=ai,riθj=aibibi2cos⁡2θj+ai2sin2θj.In the calculation process, we should initialize the parameters, such as the aperture of the bottom margin of the trapezium. We set semimajor axis a = 6, semiminor axis b = 2, h = 25, Lθj = 0.0048, φ0 = π/2, and α = 0.4189. And we set ϕi = α as the terminal condition of the iteration process. The margin curves of the reflector can be fixed according to the initial points, as shown in Figure 6(a). Then the whole freeform surface can be calculated according to the points on the margin curves. The surface of the reflector can be generated by lofting the discrete points introduced into the mechanical modeling software, as shown in Figure 6(b). By mirror imaging, we get the whole reflector as shown in Figure 6(c). Figure 6(d) shows the whole freeform curves on the reflector. Finally the entity and the size of the reflector are as shown in Figure 7. The height of the reflector is 43.5 mm, and the aperture of the reflector is 38.62 mm.

Bottom Line: We set the measuring screen as an elliptical zone and divide it into many small lattices and divide the spatial angle of the LED source into many parts and make relationships between them.According to the conservation law of energy and the Snell's law, the reflector is generated by freeform optics design method.Experiment results can fully comply with United Nations Economic Commission for Europe (ECE) vehicle regulations R113 revision 2 (Class C).

View Article: PubMed Central - PubMed

Affiliation: Engineering Research Center for Optoelectronics of Guangdong Province, School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China.

ABSTRACT
We propose a reflective optics design for an LED motorbike high beam lamp. We set the measuring screen as an elliptical zone and divide it into many small lattices and divide the spatial angle of the LED source into many parts and make relationships between them. According to the conservation law of energy and the Snell's law, the reflector is generated by freeform optics design method. Then the optical system is simulated by Monte Carlo method using ASAP software. Light pattern of simulation could meet the standard. The high beam headlamp is finally fabricated and assembled into a physical object. Experiment results can fully comply with United Nations Economic Commission for Europe (ECE) vehicle regulations R113 revision 2 (Class C).

No MeSH data available.


Related in: MedlinePlus