Directional filter for filtering ambient light

Details Directional filter for filtering ambient light Directional filter for filtering ambient light

1983-12-12

1985-11-19

Corbin, John K.

G02B 520

Patent

active

045538182

ABSTRACT:
A directional filter for ambient light is constructed from a thin base strip (2) of indeterminate length and having an opaque surface (4). The strip is wound into a roll (8) having a plurality of convolutions (10) and sections (12, 14, 16 and 18) are cut from the face of the roll. A pair of sections are disposed so that their convolutions are in an orthogonal configuration, and are sandwiched between a pair of glass plates (20, 22) having non-reflective outside surfaces (20A). Channels (24) are thereby provided, which impart directional characteristics to the ambient light.

REFERENCES:
patent: 2053173 (1936-09-01), Astima

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