| 摘要 |
PURPOSE:To execute work making coincide a locus accompanied with the feeding of the revolution center of a turn table with the optical axis of a recording beam extremely easily by irradiating an information optical signal to a recording medium and moving a rotary driving part slightly in the direction vertical to the guide carrying direction. CONSTITUTION:A guide block 17 to move and guide a bearing 3 to the carrying direction of a guide 6 is set up on a carriage 5, and the bearing 3, i.e. the whole rotary driving part including an original board 1, a turn table and a motor can be moved along the guide block 17 by operating fine adjustment screws 18, 19. A marker 22 is previously formed on a locus generated by the feeding of the revolution center of the original board 1 in a part (bearing 3) of the rotary driving part. If an optical spot 15 is shifted by (b) from the marker 22, a bolt 21 is loosened and the fine adjustment screw 19 is operated until the marker 22 reaches the position of the optical spot 15 and then clamps the bolt 21. When the optical spot is reversely shifted, the fine adjustment screw 18 is operated in the same manner. |
