| 摘要 |
PURPOSE:To reduce the parasitic resonation of a driving system and to facilitate adjustment, by providing an position adjusting means which shifts the center-of- gravity position of a carriage about a center line of driving for driving the carriage directly by electromagnetic force. CONSTITUTION:The carriage 1 engages a rail 4 through plural bearings 3 pivoted on a shaft 2 rotatably and is put in linear motion in a radius direction of a disk through the driving means consisting of a driving coil 6 and a magnetic circuit part 7. Further, the carriage 1 is provided with the center-of-gravity position adjusting means which shifts the carriage 1 in center of gravity to and from the driving center line 10 and through the rotation of a knob 11, a balance weight 9 is moved nearly at right angles to the driving center line 0 according to the rotation, thus shifting the center-of-gravity position of the carriage 1. |
