| Summary: | 碩士 === 國立彰化師範大學 === 光電科技研究所 === 98 === This thesis focused on the development of a new-style projection taillight for bicycle application. This study explored the lens design of bicycle taillight with using only one 5-millimeter light-emitting diode (LED) lamp, so that the emission pattern of the taillight could meet the specification of taillight standards. Finally, a prototype based on the designed lens was developed and characterized.
In chapter one, the motivation of this study was first described. Some literatures were then reviewed, including regulations and specification of taillight, the concept of reverse engineering and comparison of the characteristics of taillights in the current market. Finally, the target for the lens design of taillight was determined.
In chapter two, basic optics and ray-tracing theory related to optical lens design were first introduced. Moreover, comparison of various lens materials used for projection taillight was then described.
In chapter three, two programs used for lens design, including 3D drawing software, Solid Works, and optical design software, ZEMAX, were first introduced. The procedures and flow chart of lens design were then described.
The lens design of taillight using one LED was described in chapter four. First of all, the lens design was carried out utilizing one spherical lens and several cylindrical lenses in order to meet the taillight specification of Germany (StVZO). The design concept was explained in details. Next, Solid Works was used to draft and retouch the shape of 3D lens. The data of this 3D lens and a LED light source were then imported into ZEMAX, which run the ray tracing and simulated the final light pattern and intensity on the detection plane at 4 meters away. Finally, the designed lens was reshaped over again in order to meet the StVZO standard, which includes light intensities at 33 restricted areas of the detection plane. Some difficulties encountered during simulation were mentioned in this chapter as well.
Finally, the final measured data, thesis conclusion and future work were given in chapter five.
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