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Digital Information Development (DID) has developed a highly
portable virtual piano that is played with a keyboard consisting
of projected laser beams.
The box-shaped device measures about 4 x 1 x 1 in. and weighs
about 100 grams (3.5 oz.). Using a red semiconductor laser
module and holographic optical element, the device projects a
25-key, 2-octave keyboard onto the surface in front of it
(black surfaces don’t work because they absorb the light).
A CMOS camera module and infrared (invisible) red semiconductor
laser module detect which keys are touched, and the corresponding
notes are emitted from speakers built into the device.
DID says that a virtual 88-key grand piano can be created by increasing
the size of the device.