Multi-layered optical filter film and production method thereof
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United States of America Patent
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Aug 31, 1993
Grant Date -
N/A
app pub date -
Feb 4, 1991
filing date -
Feb 9, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The optical filter is comprised of a thin film having a multi-layered structure free of a substrate. The multi-layered structure is composed of alternately superposed high refractivity layers and low refractivity layers with one another. Each layer has a dense composition effective to prevent absorption of water and exhibiting substantially the same internal stress. In production of the thin film, there is utilized a substrate soluble to a certain solvent. An optical material of high refractive index and another optical material of low refractive index are alternately deposited by accelerated energy particles on the substrate surface to form a thin film of multi-layered structure. Lastly, the substrate is dissolved into the solvent to separate the thin film to form the optical filter free of the substrate.
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