| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a player to distinctively recognize a key which should be pressed by making a light source corresponding to some key illuminate according to music data, making the light emitted by the light source incident on a corresponding light guide body group, and projecting it from a light guide body constituting the group. SOLUTION: On the keys 11 and 12 constituting a keyboard 10, ribbon or tape type light guide body groups 20 are arranged. Each light guide body group 20 consists of light guide body 19 which are flexible long bodies. Each body group 20 is not only arranged on the keys 11 and 12, but also arranged over the entire part where the keys 11 and 12 are exposed. Further, each body group 20 extends into the housing of the keyboard musical instrument. In the housing, light emission bodies (light source) 30 as many as the body groups 20 are arranged. As a light emission body 30, for example, an LED, an electric bulb, etc., are usable. The light from the light emission body 30 is made incident on the rear end part of the body 19 constituting the body group 20 and emitted from the front end part of the body 19.</p> |
