| 摘要 |
In the spread illuminating apparatus in which the light emitted from the light emitting diode 4, which is disposed close to the transparent substrate 2, is made to be emitted toward the viewing direction of the transparent substrate 2, the groove 2a is provided on the transparent substrate 2 in such a manner as it crosses orthogonally light emitted in a radial direction from the light emitting diode 4 so that most light beams 5a, 5b, 5c can be emitted toward the viewing direction. Since the light beams 5a, 5b and 5c progress in the viewing direction through the groove 2a, an amount of light turning aside to no purpose can be reduced.
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