| 摘要 |
PURPOSE:To correct the eccentricity of the signal groove of a discoid recording carrier die by dividing a turntable into two upper and lower parts, and moving the upper turntable where the discoid record carrier is mounted radially on the rotary turntable. CONSTITUTION:The discoid record carrier die 2 when mounted on the upper turntable 1 while having the center hole 2 fitted around a center boss 9 is clamped to the upper turntable 1 through the magnetic attraction of a rubber magnet disk 3. Then, a positioning pin 11 is pressed in to align the tip of the pin 11 to the center hole 10a of the upper turntable 1, which is centered. Then, a discharge path 8 is linked with an externally provided vacuum discharge device (not shown in figure) to produce a vacuum and then while the outer peripheral part of the discoid record carrier die 2 is sucked pressed against the upper turntable 1, the upper turntable 1 is sucked and pressed against the lower turntable. Thus, the peripheral part of the die 2 is pressed with strong force through the vacuum suction to prevent oscillation originating from rotation. |
