MICROLENS ARRAY, DIFFUSION PLATE, AND ILLUMINATION DEVICE
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United States of America Patent
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Issued Date -
Feb 29, 2024
app pub date -
Dec 20, 2021
filing date -
Dec 28, 2020
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Abstract
A technique with which a more uniform irradiance distribution can be more reliably obtained than before is provided. A micro lens array includes: a plurality of lens elements arrayed on at least one surface of a planar member. A shape of a lens surface in each of the lens elements is defined by an aspherical expression. A pitch D between the lens elements in the micro lens array is 25 μm or greater and 150 μm or less. An intensity distribution of light that passes through the micro lens array has a batwing intensity distribution in which light intensity at both ends in a predetermined range of an angle of view is maximized and light intensity at the center in the range of the angle of view is minimized.
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