| 摘要 |
PROBLEM TO BE SOLVED: To suppress heat generation on a luminous intensity distribution plate in a lighting system for an automobile cabin. SOLUTION: The luminous intensity distribution plate 20 includes a first incident area 24 for transmitting an incident direct light of a light source 14; and a second incident area 26 for reflecting the incident direct light because an incident angle of the direct light is larger than a critical angle. Further, a reflection plate 16 is arranged so as to make the reflection light incident to the second incident area 26 and transmit it. Thereby, since two lights such as the direct light and the reflection light are not collected to one area of the luminous intensity distribution plate 20 and are separately made incident and transmitted to the respective areas, density of the light transmitted through the luminous intensity distribution plate 20 is reduced. As a result, heat generation of the luminous intensity distribution plate 20 can be suppressed. COPYRIGHT: (C)2009,JPO&INPIT
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