| 摘要 |
There is provided a spread illuminating apparatus which is improved in terms of compactness. A transparent substrate (2A) is composed of a transparent substrate proper (15), a curve (16) and an extension (17) which is plate-like, continuous with the curve (16) and substantially perpendicular to the transparent substrate proper (15). Light rays from a spot-like light source (6) enter the extension (17). Thereafter, the light rays enter the transparent substrate proper (15) due to the total internal reflection at the extension (17) and the curve (16), the reflection at a curved surface (16a) of the curve (16), and the like. Thus the light rays enter the transparent substrate proper (15) with the spot-like light source (6) not disposed on the same plane as the transparent substrate proper (15). Therefore, the spot-like light source (6) is subjected to reduced restrictions in arrangement, thereby enabling the spot-like light source (6) to be disposed on the same electric wiring board (14) together with other electronic components, whereby the apparatus can be made compact.
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