Multi-layered optical filter film and production method thereof

Details Multi-layered optical filter film and production method thereof Multi-layered optical filter film and production method thereof

1991-02-04

1993-08-31

Hannaher, Constantine

Optical: systems and elements

Light interference

Produced by coating or lamina

359580, 359588, 359589, G02B 520, G02B 528

Patent

active

052414175

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.

REFERENCES:
patent: 3551017 (1970-12-01), Iwasaki et al.
patent: 4937134 (1990-06-01), Schrenk et al.
patent: 4940636 (1990-07-01), Brock et al.
patent: 5044736 (1991-09-01), Jaskie et al.

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