Directional optical filter

Details Directional optical filter Directional optical filter

1983-03-17

1986-11-11

Corbin, John K.

G02B 520

Patent

active

046218980

ABSTRACT:
A directional filter is constructed with a plurality of grooves (15) extending into a plate (13) from one side (16) thereof. The grooves (15) have a light absorbing characteristic which causes them to absorb light impinging upon the grooves, particularly light impinging upon the grooves (15) from within the plate (13). Since all light passing beyond a certain angle .phi. must impinge upon the grooves (13), and only a small percentage of light passing parallel to the cut of the grooves (15) would impinge upon the grooves (15), the filter has a high ratio of attenuation of unwanted versus wanted light.

REFERENCES:
patent: 2053173 (1936-09-01), Astima
patent: 2909770 (1959-10-01), Pugsley
patent: 3784282 (1974-01-01), Yamazaki et al.

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