| 摘要 |
There is provided a spread illuminating apparatus to suppress leakage of light. Light emitted from a light source, reaching a first inclined surface of grooves of a light reflection pattern and exiting out there is caught by a second inclined surface thereof at an area positioned above the first inclined surface since the distance between an upper edge of the second inclined surface and the level of a bottom thereof is set greater than the distance between an upper edge of the first inclined surface and the level of the bottom thereof. Thus, light, which will leak in case of a conventional art, can reenter a transparent substrate at the second inclined surface so as to improve illumination efficiency.
|
