Multi-layered anti-reflection coating
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United States of America Patent
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-
Nov 15, 1988
Grant Date -
N/A
app pub date -
Feb 13, 1987
filing date -
Feb 18, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multi-layered anti-reflection coating for use with a plastic substrate is provided. The coating consists of four layers and has high durability. The first layer furthest from the substrate is made of SiO.sub.2 ; the second layer is made of a mixture of ZrO.sub.2 and TiO.sub.2 ; the third layer is made of ZrO.sub.2 ; and the fourth layer is made of SiO or SiO.sub.2. The optical thicknesses of the first to third layers are about 0.25.lambda. with respect to a design wavelength .lambda., respectively. However the optical thickness of the fourth layer is greater than that of the respective first to third layers and selected between 0.5.lambda. to 2.0.lambda..
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