OPTICAL APPARATUS, IMAGE PICKUP APPARATUS, AND PROJECTION APPARATUS
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United States of America Patent
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Issued Date -
Feb 22, 2024
app pub date -
Aug 11, 2023
filing date -
Aug 16, 2022
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Abstract
The optical apparatus comprises an optical member and an aluminum alloy member facing the optical member. A black oxide coating is formed on a surface of the aluminum alloy member facing the optical member, and a plurality of holes each having a diameter of 5 μm or more and 100 μm or less are formed in the black oxide coating.
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