| 摘要 |
A lens array includes a plurality of lens groups each of which includes lenses (53) so disposed that optical axes thereof are aligned with each other. The lens groups are arranged in a direction perpendicular to the optical axes. A light-blocking portion (54) is provided for shielding each of the lens group from light having passed through any lens of other lens group. A largest diameter D of the lens and an arrangement interval P at which the lens groups are arranged satisfy the relationship: P<D.
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