Electrically controllable window treatment system to control sun glare in a space
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United States of America Patent
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Jun 21, 2011
Grant Date -
Jan 14, 2010
app pub date -
Aug 14, 2009
filing date -
Mar 24, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A system for reducing sun glare through an opening into a space, the system comprising an electrically controllable window treatment operable to alter the amount of daylight entering the space through the opening; a first sensor mounted within the space and characterized by a sensor gain, the first sensor operable to sense a level of illumination in the space; and a control system operable: to compare the sensed illumination level in the space to a dead-band having upper and lower thresholds; to adjust during a time period when glare from the sun can occur through the opening at least one of: (a) the upper threshold of the dead-band, (b) the lower threshold of the dead-band, and (c) the sensor gain of the first sensor; and to adjust the window treatment in response to the sensed level of illumination to reduce the sun glare.
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