Stored light intensity measurement device
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United States of America Patent
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Jan 20, 2009
Grant Date -
Jun 21, 2007
app pub date -
Dec 20, 2006
filing date -
Dec 21, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A stored light intensity measurement device capable of measuring an afterglow intensity from a light storing sign in a simple way, even if the light storing sign is provided on walls or risers of stairs in facilities or underground shopping mall. The stored light intensity measurement device comprising the light measuring unit configured o measure afterglow from a part of a light storing section on a light storing sign, and calculation means for calculating an afterglow intensity from the light storing sign based on the measured results.
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