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Along with the tendency to esteem fuel economy, driving security and aerodynamic excellence, the voice to demand technical improvement of headlamps is getting higher and higher every day. With the expectation to meet such common and strong demand of world's automotive industry, retractable headlamps and slanting headlamps (headlamps of which front lenses are slanted) have been put to practical use so far. However, retractable headlamps have a disadvantage that once lighted, they lose their aerodynamic efficacy. Moreover, the mechanism of retractable headlamp system is rather complicated and causes cost increase. On the other hand, in slanting headlamps, light emission inefficiency that increases in proportion to the lens slant angle settles certain limitation on the popularity of this system.