Directional filter for filtering ambient light
First Claim
Patent Images
1. A directional filter for filtering ambient light, characterized by:
- first and second sections of a roll formed by winding a thin base strip into a plurality of convolutions, with each of the convolutions having an opaque surface;
the first and second sections being cut from the face of the roll, with said first and second sections being disposed relative to each other so that their respective convolutions are in an orthogonal relationship;
said convolutions in an orthogonal relationship cooperating to form light directing channels which are bounded by opaque surfaces; and
said light directing channels imparting directional characteristics to light entering the filter from outside a predetermined angle and for thereby filtering said light.
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Accused Products
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.
13 Citations
11 Claims
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1. A directional filter for filtering ambient light, characterized by:
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first and second sections of a roll formed by winding a thin base strip into a plurality of convolutions, with each of the convolutions having an opaque surface; the first and second sections being cut from the face of the roll, with said first and second sections being disposed relative to each other so that their respective convolutions are in an orthogonal relationship; said convolutions in an orthogonal relationship cooperating to form light directing channels which are bounded by opaque surfaces; and said light directing channels imparting directional characteristics to light entering the filter from outside a predetermined angle and for thereby filtering said light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A directional filter for filtering ambient light, characterized by:
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first and second sections of a roll having a plurality of convolutions, each of the convolutions having an opaque surface; the first and second sections being cut from the face of the roll, with said first and second sections being disposed relative to each other so that their respective convolutions are in an orthogonal relationship; said convolutions in an orthogonal relationship cooperating to form light directing channels which are bounded by opaque surfaces; and said light directing channels imparting directional characteristics to light entering the filter from outside a predetermined angle and for thereby filtering said light.
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10. A filter as described by claim 10, characterized by:
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first and second cover plates; the first and second sections disposed relative to each other so that their respective convolutions are in an orthogonal relationship being sandwiched between the first and second cover plates; and the first and second sections and the first and second cover plates being bonded together to provide an integral filter. - View Dependent Claims (11)
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Specification