Specific wavelength selecting method for optical input device and optical input device thereof
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United States of America Patent
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Sep 10, 2013
Grant Date -
Apr 21, 2011
app pub date -
Dec 15, 2009
filing date -
Oct 21, 2009
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Abstract
A specific wavelength selecting method for an optical input device includes the following steps. A light source for respectively emitting at least two light rays in different wavelength regions is first enabled. Next, the two light rays are projected to a working surface to obtain at least two corresponding reflected light rays. Then, optical signals of the reflected light rays are detected and compared to obtain a preferred optical result. Finally, a light ray in the most suitable wavelength region is selected and enabled according to the preferred optical result.
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