Optical lens with antireflective film, projection lens, and projection lens optical system
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United States of America Patent
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Dec 19, 2023
Grant Date -
Jul 1, 2021
app pub date -
Dec 18, 2020
filing date -
Dec 25, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
An optical lens with an antireflective film includes: a lens substrate; and an antireflective film disposed on the lens substrate. The antireflective film is formed of layers each having a physical thickness of 140 nm or less. In order from an air side, the antireflective film has: a first layer formed as an MgF2 layer, a second layer, a fourth layer, a sixth layer, an eighth layer, and a tenth layer each having a refractive index of 2.0 or more and 2.3 or less, and a third layer, a fifth layer, a seventh layer, and a ninth layer each formed as an SiO2 layer.
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