Patent ID: 7893344
Filing Date: 2011-02-22
Classification: G10G,G10H

Abstract:
1. A touch detecting device of a keyboard instrument, for detecting touch information containing key depression information of a pivotally movable key, comprising: a shutter that pivotally moves in accordance with pivotal motion of the key; a plurality of optical sensors that are provided close to a pivotal path of said shutter, and each have a light emitting part and a light receiving part for receiving light emitted from the light emitting part, said light emitting part and said light receiving part being disposed on respective opposite sides of the pivotal path; and touch information detecting means for detecting, as the key pivotally moves, the touch information based on presence or absence of light received by said light receiving parts of said optical sensors, in accordance with opening or closing of optical paths of light from said light emitting parts of said optical sensors, by said shutter, wherein adjacent two of said optical sensors are arranged such that said light emitting part of one of said two and said light receiving part of the other of said two are disposed adjacent to each other on a same side of the pivotal path of said shutter.