Filter with three-band transmission for good seeing

Details Filter with three-band transmission for good seeing Filter with three-band transmission for good seeing

1988-05-06

1989-05-02

Arnold, Bruce Y.

350164, G02B 528, G02B 110

Patent

active

048262862

ABSTRACT:
Filter system operates to provide reasonable seeability for human visual system while simultaneously limiting the total radiation energy impinging upon the eye. System comprises a transparent substrate which carries a plurality of thin layers having indices of refraction which alternately vary from a high index to a low index. Radiations passing the filter system are substantially confined to three bands centered at about 450 nm, 530 nm, and 610 nm with the width of the bands being from about 3 nm to about 50 nm as measured at one-half the maximum measured radiation transmission of each of the bands.

REFERENCES:
patent: 3877797 (1975-04-01), Thorton, Jr.
patent: 4176299 (1979-11-01), Thorton, Jr.
patent: 4334782 (1982-06-01), Thorton, Jr. et al.

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