A hammer sensor includes a photo-filter plate movable together with a hammer assembly and having a base plate fixed to the hammer shank and an arc pattern formed on the base plate and different in transparency from the base plate, a photo radiating element radiating a light beam toward the arc pattern and a photo detecting element disposed on the optical path of the light beam for converting the amount of transmitted light to an electric signal, wherein the photo-filter plate converts the rotational angle of the hammer assembly to the amount of light incident on the photo detecting element, and makes the photo radiating element and the photo detecting element stationary so that a suitable photo-shield case prevents the photo elements from environmental light.

 
Web www.patentalert.com

< Method of improving repetitive striking performance, jack and action mechanism of piano

< Cymbals operation control

> Reversible seat cup for percussion instrument

> Musical composition reproducing apparatus portable terminal musical composition reproducing method and storage medium

~ 00205