High resolution key sensor incorporated in keyboard musical inst

Details High resolution key sensor incorporated in keyboard musical inst High resolution key sensor incorporated in keyboard musical inst

1994-08-17

1997-06-24

Spyrou, Cassandra C.

Music

Accessories

Recording devices

84433, G10G 304

Patent

active

056419252

ABSTRACT:
A key sensor incorporated in a keyboard musical instrument has a shutter plate attached to a turnable key and photo-interrupters stationary with respect to a key bed, and the shutter plate has an outer bottom edge and an inner bottom edge oblique with respect to a virtual plane where optical paths of the photo-interrupters are extending so that the shutter plate intermittently crosses the optical paths.

REFERENCES:
patent: 4307648 (1981-12-01), Stahnke
patent: 4351221 (1982-09-01), Starnes et al.
patent: 4913026 (1990-04-01), Kaneko et al.

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