Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Design of LED Bicycle Headlamp with a Horizontally Wide Viewing Angle

  • Park, Hyun Jung (Department of Printed Electronics Engineering, Sunchon National University) ;
  • Lee, Dong Kyu (Department of Printed Electronics Engineering, Sunchon National University) ;
  • Lee, Jae Min (Department of Printed Electronics Engineering, Sunchon National University) ;
  • Park, Kwang-Woo (Korea Photonics Technology Institute (KOPTI)) ;
  • Joo, Jae Young (Korea Photonics Technology Institute (KOPTI)) ;
  • Kwak, Joon Seop (Department of Printed Electronics Engineering, Sunchon National University)
  • Received : 2016.11.07
  • Accepted : 2017.06.06
  • Published : 2017.08.25
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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 $28^{\circ}$ 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 ${\pm}0.5mm$ at the X, Y and Z axes within a less centered aiming range of ${\pm}1^{\circ}$. 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.

Keywords

References

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