| 摘要 |
The light beam 5a emitted from a light source Pa is formed into a parallel light beam 6a upon entering the substrate 1 as a result of the effect of lens strips 2a. The parallel light beam 6a reaches the end surface on the emission side of the substrate 1, and is there subjected to the effect of lens strips 3a so that this light beam is focused at a focal position Qa (focal point) on the rear side of the lens strips 3a. Similarly, the light beam 5b emitted from a light source Pb is subjected to the effect of lens strips 2b and is formed into a parallel light beam 6b inside the substrate 1; this light beam is then further subjected to the effect of lens strips 3b, and is therefore focused at a focal point Qb located in a position that is separated from the surface of the substrate 1 by a distance of f. The y direction positions of the light source Pa and the focal points Qa and Qb are respectively shifted by a distance equal to the spacing between the axis of rotational symmetry 4a of the lens strips 2a and 3a and the axis of rotational symmetry 4b of the lens strips 2b and 3b.
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