Keyboard musical instrument, position sensing device and light-emitting controller both incorporated therein
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United States of America Patent
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May 8, 2001
Grant Date -
N/A
app pub date -
Sep 14, 1999
filing date -
Sep 18, 1998
priority date (Note) -
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Abstract
An automatic player piano is equipped with a position detecting device for detecting current positions of the black/white keys, and the position detecting device radiates light beams across the trajectories of the black/white keys, wherein the position detecting device stores a variable relation between a relative value of the amount of light and the current positions for determining the current positions so that the position detecting device keeps the reliability of the current positions against aged deterioration.
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