| 摘要 |
There is provided a touch detecting device of a keyboard instrument, which makes it possible not only to enhance the mounting density of a plurality of optical sensors, but also to detect touch information of a key with high accuracy without being affected by light from the other optical sensors. The touch detecting device comprises a shutter 6 that moves in accordance with pivotal motion of a key 4, a plurality of optical sensors 7 and 8 that are provided close to a pivotal path of the shutter 6 and have respective light emitting parts 7a and 8a and respective light receiving parts 7b and 8b for receiving light emitted from the light emitting parts, on respective opposite sides of the pivotal path, and touch information detecting means 23 for detecting, as the key 4 pivotally moves, the touch information based on presence or absence of light received by the light receiving parts of the optical sensors 7 and 8 in accordance with opening or closing of optical paths of light from the light emitting parts of the optical sensors 7 and 8, by the shutter 6. Adjacent two of the optical sensors 7 and 8 are arranged such that the light emitting part of one of the two and the light receiving part of the other of the two disposed adjacent to each other on the same side of the pivotal path of the shutter 6.
|
