Anti-glare protection device
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United States of America Patent
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May 22, 2012
Grant Date -
Mar 15, 2007
app pub date -
Sep 9, 2005
filing date -
Sep 9, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An anti-glare protection device for a welding mask includes a transmission control circuit for determining a darkening signal from a control signal, a welding activity detection circuit (6) for detecting a welding activity, based on the output of a first sensor circuit. The welding activity detection circuit is arranged to control, via an activation switch, whether either the darkening signal or a signal corresponding to an undarkened optical filter is input to a filter drive circuit. The filter drive circuit drives a controllable optical filter to a transmission value according to the signal input to the filter drive circuit. A manual input device allows a user to manually adjust a user selected signal. A second sensor circuit determines a sensed signal. A manually operable mode selection switch for selecting either, in a manual mode, the user selected signal or, in an automatic mode, the sensed signal to be used as the control signal to the transmission control circuit.
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