| 摘要 |
PURPOSE:To make easy installation to a musical instrument main body and the adjustment and to provide an improved maintenance property by forming a key switch, control switch and their conductor patterns on a common flexible sheet base. CONSTITUTION:The key switch sheet portion 3a of a flexible sheet base 3 is inserted between inverted-L resin guides L1, L2 located in the gap between the key 2a, 2b of a keyboard portion 2 and a keyboard frame 2c and is integrated therewith, with a stepped level portion 3a flatly extended. The keyboard portion 2 is fitted into the opening 1b of an upper case 1 in which various controllers and speakers are incorporated. The key switch sheet portion 3a is locked to the frame 2c by means of screws or the like. A holding plate 4 is pressed to a panel switch she portion 3b from below and secured thereto by means of screws or the like. Each key switch portion and each control switch portion are connected to the respective portions of an instrument main body side main circuit via a connector terminal 3e. Finally, a lower case 5 is fitted to complete assembly of the musical instrument. It is thus made easy to mount and remove and maintain the switch sheet portion 3a. |
