Method and apparatus for controlling opening of an auto-darkening filter in an eye protection device
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United States of America Patent
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Apr 9, 2019
Grant Date -
May 21, 2015
app pub date -
Nov 21, 2013
filing date -
Nov 21, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An eye protection device for a welding mask or the like includes a welding activity detection circuit that is configured to detect welding activity, and a filter driver that controls an optical filter to be in undarkened and darkened states. The filter driver is configured to (i) provide a slower and/or gradual opening of the filter, (ii) insert a user-selected delay and/or gradient between the end of welding activity and the opening of the filter, and/or (iii) cause variation of light transmission values of the filter between a darkened state and an undarkened state based on varying brightness detected by a brightness sensor during transition of the filter from a darkened state to an undarkened state.
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