Automatic darkening filter apparatus and method
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United States of America Patent
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Sep 17, 2013
Grant Date -
May 23, 2013
app pub date -
Jan 23, 2013
filing date -
Oct 5, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Herein is disclosed an automatic darkening filter apparatus comprising a shutter control system configured to cause a shutter to switch from a dark state to an intermediate state in response to a change from high intensity incident light to low intensity incident light being detected. The control system is further configured to maintain the shutter in the intermediate state for a period of time, unless during this period of time high intensity light is detected, in which case the control system causes the shutter to switch to the dark state. If, at the end of the period of time, high intensity light is not detected, the shutter is caused to switch from the intermediate state to a light state.
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