Coordinate input apparatus
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United States of America Patent
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Mar 17, 2015
Grant Date -
Sep 12, 2013
app pub date -
Feb 25, 2013
filing date -
Mar 8, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A coordinate input apparatus includes a light projecting unit configured to project light parallelly to an effective coordinate input region, a reflection unit configured to retroreflect the light projected by the light projecting unit, and a light receiving unit configured to receive light from the light projecting unit or the reflection unit. The coordinate input apparatus includes a moving unit configured to move a set of the light projecting unit, light receiving unit, and reflection unit in a direction perpendicular to the effective coordinate input region in order to ensure a light amount with which a pointed position in the effective coordinate input region can be calculated based on variations of a light amount distribution obtained from the light receiving unit.
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