Keyboard musical instrument having easily installable...

Details Keyboard musical instrument having easily installable... Keyboard musical instrument having easily installable...

2006-05-23

2006-05-23

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C084S724000, C250S227220

Reexamination Certificate

active

07049576

ABSTRACT:
An optical position transducer is provided for each of the black/white keys incorporated in a composite keyboard musical instrument; the optical position transducer includes a photo-coupler radiating a light beam, an optical filter moved across the light beam, a recess formed in the black/white key at a proper position where the optical filter is aligned with a target trajectory crossing the light beam and an elastic coupler pressed to an inner surface defining the recess and secured to the optical filter so that a worker assembles the optical filter with the key by inserting the elastic coupler into the recess.

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