| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a black key for an electronic keyboard instrument which looks luminous over a wide range in received light from a light emitting means. <P>SOLUTION: A black key 1 the free end side of which is supported to freely move up and down via a rotation supporting point part with respect to a key frame, is provided with: a key body 10 which has an upper wall 11, sidewalls and a front wall 13 in the free end side formed with a blackish translucent material, wherein a hollow part 15 is formed inside; a translucent light transmission body 40 arranged in a hollow part 15 to extend along the key body 10; a reflection body 60 extending along a lower surface of the light transmission body; and a light guide part 30 provided in a lower part of the key body 10 so as to approach a surface which is not covered with the reflection body 60 in the light transmission body 40. In the black key for the electronic keyboard instrument, the light transmission body 40 is arranged in the hollow part 15 so that incident light to the light guide part 30 passes through the light transmission body and is partly emitted from the key body 10 with reflection at the reflection body 60. <P>COPYRIGHT: (C)2010,JPO&INPIT |
