Toric lens, optical element, and image forming apparatus

In a toric lens comprising a toric surface having a fine uneven structure, the fine uneven structure includes a plurality of holes, the plurality of holes have a hole depth H and a surface opening diameter φt which satisfy an expression of 0.3≤H/φt≤0.6, and (a) the plurality of holes have a hole str...

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Bibliographische Detailangaben
Hauptverfasser: Terada, Junji, Arai, Kazuhiro, Kameno, Yu, Yoshikawa, Toshiaki, Nakai, Noriyuki, Takachi, Miwa
Format: Patent
Sprache:eng
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Zusammenfassung:In a toric lens comprising a toric surface having a fine uneven structure, the fine uneven structure includes a plurality of holes, the plurality of holes have a hole depth H and a surface opening diameter φt which satisfy an expression of 0.3≤H/φt≤0.6, and (a) the plurality of holes have a hole structure having a cylindrical shape on a bottom surface side and a circular truncated cone shape having an opening diameter increasing toward a surface side, or (b) an angle θ formed between an opening portion and the surface of the plurality of holes satisfies 78°≤θ≤85°.