| 摘要 |
A record player suitable for a so-called scratch performance operation by which a phonograph record is directly rotated in forward and reverse direction to output new artificial sound by fingering of an operator is provided. The positional relationship between the record groove on the turntable and the supporting point P of the arm shaft is defined so as to suppress inward and outward component forces applied to the needlepoint of the cartridge as possible. Three points including a start point and an end point of the record groove on a straight line extending from the rotating shaft core of the turntable in a radial pattern and a rotation center of a tone arm, namely, the supporting point may form an isosceles triangle with the supporting point as an apex.
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