| 摘要 |
A stringed musical instrument (12) that can be played either in a fretted or a fretless mode includes an interconnected fret assembly (38) including frets (24) and a longitudinal fret interconnecting member (40) that is attached to, and movable with, the frets. A movable linear cam structure (46) has two cams at each fret, one positioned on each side of the fret interconnecting member, and includes rack teeth (52) which mesh with a pinion (62) driven by a lever (66) for causing linear movement of the linear cam structure. The interconnecting member is an elongated slat (40) which is positioned in a slot (50) between the cams. The linear-movable cam includes an elongated guide protrusion (56) and an interior cavity (30) of the fingerboard, in which the cam rides, defines an elongated guide slot (58) for receiving the guide protrusion and thereby limiting lateral movement of the linear cam. The linear cam structure and the interior cavity have tapered lateral sides.
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