| Summary: | 碩士 === 國立中央大學 === 光電科學研究所 === 93 === Projection Lamp is composed by four major parts : light source, reflector, shield and lens. In the design of traditional lamp, a aspherical model with 4th order equation in the cross-section is adopted to design aspherical lens. A polyellipsoid reflector surface with different vertical and horizontal cross-sections is used to keep the reflector in ellipsoid form but its axial length varies with the rotating angle. This reflector with variable axis can create very flexible light pattern. A flat shape of screen with horizontal in left hand side and declined down angle in right hand side is applied. The former designed 3 parts accompany with a H1 lamp can pass ECE regulation in ASAP simulation.
With the rapid development of high power LED, it is gradually used as an light source of headlamp. Different with traditional lamp, there are a lot of factors have to be considered when LED used as a light source of front headlamp. In this paper, these major considerations are discussed. A 100lm with specific radiation pattern, white light LED is applied to redesign projection lens, polyellipsoid reflector and shield by changing related design parameters.
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