Electrically-conductive, contrast-selectable, contrast-improving filter
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United States of America Patent
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May 28, 1996
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N/A
app pub date -
Jul 7, 1994
filing date -
Jul 7, 1994
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Abstract
The present invention comprises a contrast-improving filter which uses a tri-layer comprising a metal layer, preferably silver, sandwiched between two metal precoat layers. The silver layer is thin so that it is substantially transparent to visible light. Additionally, the contrast-improving filter uses a silicon nitride layer between the tri-layer and further oxide layer to improve the durability and scratch-resistance of the contrast-improving filter.
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