OPTICAL ELEMENT WITH EXCELLENT ENVIRONMENTAL DURABILITY
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United States of America Patent
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Issued Date -
Aug 15, 2024
app pub date -
Feb 7, 2024
filing date -
Feb 10, 2023
priority date (Note) -
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Abstract
An optical element includes: a base material; and a resin portion, wherein the base material has a spherical surface, a flat surface surrounding the spherical surface, and a ridge line portion including a ridge line at the boundary between the spherical surface and the flat surface, wherein the resin portion is provided over the spherical surface and over the flat surface straddling the ridge line portion, has a linear expansion coefficient different from a linear expansion coefficient of the base material, has a maximum thickness at a first point between a center and an edge of the spherical surface of the base material, which is thicker than a thickness at the center, has a thickness thinner than the maximum thickness at a second point between the first point and the edge, and has a thickness thicker at the ridge line portion than the thickness at the second point.
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