Abstract

This paper proposes a LED bicycle headlamp with a wide viewing angle to help bicyclists see the front effectively and because of its high visibility to reduce the risks of accidents around intersections or blind spots. The wide viewing angle was determined to be 28° because it can illuminate a 5 m wide area 10 m away. Therefore, the road conditions of the intersection can be observed with the bicycle handlebar tilted slightly to the left or right. The headlamp has a compact reflector with a width of 30 mm, height of 27 mm, and length of 17 mm. Owing to its size, a change in the position of a light source leads to severe changes in light distribution. Therefore, the tolerance of the source position was analyzed by a simulation. The tolerance was ±0.5 mm at the X, Y and Z axes within a less centered aiming range of ±1°. Finally, the prototype of the bicycle headlamp was made and the light distribution was measured by an automotive headlamp light measurement system. The experimental results indicate that the headlamp illuminates a 5 m wide area with an edge light of 3.2 lx as well as meeting the K-mark regulation.

PDF Article

References

  • View by:
  • |

  1. C. Huy, S. Becker, U. Gomolinsky, T. Klein, and A. ThielHealth, medical risk factors, and bicycle use in everyday life in the over-50 populationJ. Aging Phys. Act.200816454464
  2. G. Hu, H. Pekkarinen, O. Hänninen, H. Tian, and Z. GuoRelation between commuting, leisure time physical activity and serum lipids in a Chinese urban populationAnn. Hum. Biol.200128412421
  3. H. Summala, E. Pasanen, M. Räsänen, and J. SievänenBicycle accidents and drivers’ visual search at left and right turnsAccid. Anal. Prev.199628147153
  4. A. Wachtel and D. LewistonRisk factors for bicycle-motor vehicle collisions at intersectionsITE Journal (Institute of Transportation Engineers)1994643035
  5. J. Kim, S. Kim, G. F. Ulfarsson, and L. A. PorrelloBicyclist injury severities in bicycle-motor vehicle accidentsAccid. Anal. Prev.200739238251
  6. Y. Wang and N. L. NihanEstimating the risk of collisions between bicycles and motor vehicles at signalized intersectionsAccid. Anal. Prev.200436313321
  7. Stasenverkehrs-Zulassungs-Ordnung (StVZO) 22A No.23http://www.enhydralutris.de/Fahrrad/Beleuchtung/node403.htmlRetrieved 2 October 2010
  8. E. F. Schubert, T. Gessmann, and J. K. KimLight emitting diodesWiley Online Library2005
  9. D. Jang, S. Yook, and K. LeeOptimum design of a radial heat sink with a fin-height profile for high-power LED lighting applicationsAppl. Energy2014116260268
  10. J. Cai, C. Sun, Y. Lo, and S. FengDesign of highefficient LED-based bike head lamp with additional ground illuminationLighting Res. Technol.201446747753
  11. H. Wu, X. Zhang, and P. GeA freeform reflector for a light-emitting diode bicycle head lampLighting Res. Technol.201648642652
  12. A. Whang, K. Jhan, S. Chao, G. Chen, C. Chou, C. Lin, C. Chang, K. Chen, and Y. LaiAn innovative vehicle headlamp design based on high-efficiency LED light pipe systemLighting Res. Technol.201345111
  13. X. Mao, H. Li, Y. Han, and Y. LuoTwo-step design method for highly compact three-dimensional freeform optical system for LED surface light sourceOpt. Express201422A1491A1506
  14. L. Wang, K. Qian, and Y. LuoDiscontinuous free-form lens design for prescribed irradianceAppl. Opt.20074637163723
  15. J. Valentino and J. GoldenbergIntroduction to computer numerical control (CNC)Prentice Hall Englewood Cliffs2003
  16. Y. KorenInterpolator for a computer numerical control systemIEEE Trans. Comput.1976253237

Other (16)

C. Huy, S. Becker, U. Gomolinsky, T. Klein, and A. ThielHealth, medical risk factors, and bicycle use in everyday life in the over-50 populationJ. Aging Phys. Act.200816454464

G. Hu, H. Pekkarinen, O. Hänninen, H. Tian, and Z. GuoRelation between commuting, leisure time physical activity and serum lipids in a Chinese urban populationAnn. Hum. Biol.200128412421

H. Summala, E. Pasanen, M. Räsänen, and J. SievänenBicycle accidents and drivers’ visual search at left and right turnsAccid. Anal. Prev.199628147153

A. Wachtel and D. LewistonRisk factors for bicycle-motor vehicle collisions at intersectionsITE Journal (Institute of Transportation Engineers)1994643035

J. Kim, S. Kim, G. F. Ulfarsson, and L. A. PorrelloBicyclist injury severities in bicycle-motor vehicle accidentsAccid. Anal. Prev.200739238251

Y. Wang and N. L. NihanEstimating the risk of collisions between bicycles and motor vehicles at signalized intersectionsAccid. Anal. Prev.200436313321

Stasenverkehrs-Zulassungs-Ordnung (StVZO) 22A No.23http://www.enhydralutris.de/Fahrrad/Beleuchtung/node403.htmlRetrieved 2 October 2010

E. F. Schubert, T. Gessmann, and J. K. KimLight emitting diodesWiley Online Library2005

D. Jang, S. Yook, and K. LeeOptimum design of a radial heat sink with a fin-height profile for high-power LED lighting applicationsAppl. Energy2014116260268

J. Cai, C. Sun, Y. Lo, and S. FengDesign of highefficient LED-based bike head lamp with additional ground illuminationLighting Res. Technol.201446747753

H. Wu, X. Zhang, and P. GeA freeform reflector for a light-emitting diode bicycle head lampLighting Res. Technol.201648642652

A. Whang, K. Jhan, S. Chao, G. Chen, C. Chou, C. Lin, C. Chang, K. Chen, and Y. LaiAn innovative vehicle headlamp design based on high-efficiency LED light pipe systemLighting Res. Technol.201345111

X. Mao, H. Li, Y. Han, and Y. LuoTwo-step design method for highly compact three-dimensional freeform optical system for LED surface light sourceOpt. Express201422A1491A1506

L. Wang, K. Qian, and Y. LuoDiscontinuous free-form lens design for prescribed irradianceAppl. Opt.20074637163723

J. Valentino and J. GoldenbergIntroduction to computer numerical control (CNC)Prentice Hall Englewood Cliffs2003

Y. KorenInterpolator for a computer numerical control systemIEEE Trans. Comput.1976253237

Cited By

OSA participates in Crossref's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.