| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lens array sheet where the sharp inclination of a lens surface is eliminated and which is hardly restricted in terms of working by constituting the lens array sheet of an incident surface where microlenses having rotationally symmetric aspherical shape are closely disposed and an emitting surface where the microlenses having toric surface shape are disposed. SOLUTION: This lens array sheet 5 is constituted of the incident surface where the microlenses having the rotationally symmetric aspherical shape are closely disposed and the emitting surface where the microlenses having the same optical axis as the former microlens, paired with the former microlens and having the toric surface shape are disposed. The lens array sheet 5 condenses light once by an incident side lens array 6. In such a case, a light condensing position 9 is decided in keeping with an emitting side lens array 8, so that the light need not be condensed at an acute angle. Therefore, the inclination of a lens boundary part is made small. Thus, machinability in producing a metallic mold and lens forming workability is made compatible with optical performance.
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