Microlens array unit and solid state imaging device
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United States of America Patent
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Jun 16, 2015
Grant Date -
Sep 25, 2014
app pub date -
Jan 28, 2014
filing date -
Mar 19, 2013
priority date (Note) -
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Abstract
A microlens array unit according to an embodiment includes: a substrate; a first group of microlenses including first microlenses having a convex shape and a first focal length, the first group of microlenses being arranged on the substrate; and a second group of microlenses including second microlenses having a convex shape and a second focal length different from the first focal length, the second group of microlenses being arranged on the substrate, a first imaging plane of the first group of microlenses and a second imaging plane of the second group of microlenses being parallel to each other, a distance between the first and second imaging planes in a direction perpendicular to the first imaging plane being 20% or less of the first focal length, and images of the first microlenses projected on the substrate not overlapping images of the second microlenses projected on the substrate.
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