Toric lens, optical element, and image forming apparatus
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United States of America Patent
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May 31, 2022
Grant Date -
Apr 16, 2020
app pub date -
Oct 15, 2019
filing date -
Oct 16, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
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°.
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