| 摘要 |
PROBLEM TO BE SOLVED: To light a circular arc region at high illuminance with less illuminance irregularities by fining the pitch of an interference pattern in a lighting device using a circular arc MLA. SOLUTION: The pitch of an interference pattern in a lit surface is fined by modulating a phase from an element lens of an MLA. For example, phase difference between adjacent element lenses is made 0°, 180°, 0°, 180°; thereby, the pitch of an interference pattern in a lit surface is made half as a whole by superposing a dark part of an interference pattern generated between element lenses of phase difference of 180°in a dark part of an interference pattern generated in element lenses of phase difference of 0°. COPYRIGHT: (C)2005,JPO&NCIPI
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