Controllable light angle selector
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United States of America Patent
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May 22, 2012
Grant Date -
Jan 20, 2011
app pub date -
Mar 31, 2009
filing date -
Apr 3, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Disclosed is a controllable light angle selecting device that includes a fixed light selecting means for transmitting light within a limited acceptance angle, optically connected to at least one light redirecting means capable of achieving a variable angular difference between light entering said light redirecting means and light exiting said light redirecting means. Also disclosed is a photometer employing such controllable light angle selecting device and arranged in the path of light between a light source and at least one light measuring sensor arranged to receive at least part of the light exiting from the controllable light angle selecting device.
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