Title:
DISK
Document Type and Number:
Japanese Patent JPS63201969
Kind Code:
A
Abstract:
PURPOSE:To improve a centering precision to a driving rotary shaft by fixing tentatively a hub member onto a disk substrate by using an adhesive while being centered to a center hole, and fastening them by using a fastening member after the tentative fixing. CONSTITUTION:The hub members 2, 2' are formed by a metal or a plastic, and provided with center holes 2a, 2a', worked at high precision, and the faces abutting the flange parts 2b, 2b' of the hub member with the disk substrates 1, 1' are coated with the adhesive 3, and the hub members 2, 2' are tentatively fixed while being centered to the center holes 2b, 2b' and the center of the recording layer. Besides, on each of the hub members 2, 2', consisting of one pair of a front side and a back side, the fastening member fitting holes 2c, 2c' of a proper number are provided, and fastened by the screws 4 of the fastening member. Thus, the hub member can be easily attached to the disk substrate, while the centering precision to the recording layer is kept good (an eccentricity is small), and further, a fixing strength is maintained to be sufficient.
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Inventors:
WATANABE HIDETOSHI
Application Number:
JP3405187A
Publication Date:
August 22, 1988
Filing Date:
February 17, 1987
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B23/00; (IPC1-7): G11B23/00
Attorney, Agent or Firm:
Fujiya Shiga