Patent ID: 6222818
Filing Date: 2001-04-24
Classification: G11B

Abstract:
A disc chucking mechanism comprising:a turn table, on which a disc with a center hole is disposed, driven by a rotation driving means, said turn table includinga cylindrical portion to which the center hole of a disc is fit,a first guide protruding radially outwardly of an outer circumferential surface of said cylindrical portion,second and third guides retractably provided at positions angularly spaced approximately 120.degree. from said first guide with respect to the center of rotation of said cylindrical portion, andauxiliary guides provided at mid-positions between said second guide and said first guide and between said third guide and said first guide, a height of a peak point of each said auxiliary guide being smaller than a height of a peak point of said first guide when measured from the outer circumferential surface of said cylindrical portion,wherein the distance of each said auxiliary guide measured from the outer circumferential surface of said cylindrical portion is smaller than the distance of the peak point of said first guide from the outer circumferential surface of said cylindrical portion.