| 摘要 |
A window construction adapted to permit or prevent the transmission of light including first and second fixed polarizer panels, the first of which comprises two adjacent polarizers which are in the same plane, and have their absorption axes perpendicular to each other, and a moveable panel between the fixed panels comprising a wave retarder. The absorption axis of the second polarizer panel is perpendicular to either absorption axis of the polarizers comprising the first panel so that maximum or minimum light transmission through the construction is effected by moving the wave retarder between the fixed polarizer panels. The fixed polarizer panels are generally coincident in size and shape and are positioned in parallel planes.
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