| 摘要 |
An optical device includes a plurality of lens plates spaced at specific intervals. At least one of the lens plates is provided with a lens array on at least one of its front and rear faces. The lens array is composed of a plurality of closely arranged lenses of a specific configuration. The lens array has at least one groove having a V-shaped cross-sectional configuration at a joint of adjacent lenses in at least one part of the lens array.
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