Patent ID: 6952834

Claim:
A disc chucking device comprising: a disc table whose rotation-center line is laid generally orthogonally to the vertical direction and onto which a disc-shaped recording medium is set with the main side thereof being parallel to the vertical direction; a centering block shaped like a truncated cone and formed on the disc table, the centering block including an end portion with an oblique face, an intermediate portion which is contiguous to the end portion, and a base portion is contiguous to the intermediate portion, shaped larger than the intermediate portion and having a diameter which is to be fitted in a central hole in the disc-shaped recording medium; a motor to rotate the disc table; a clamper to pinch along with the disc table the disc-shaped recording medium put on the disc table; and a fall-off preventive means provided on a side face between the base and intermediate portions of the centering block for engagement with the disc-shaped recording medium at the central hole formed in the latter.