Laminated optical disc and turntable for the laminated optical d

Details Laminated optical disc and turntable for the laminated optical d Laminated optical disc and turntable for the laminated optical d

1998-06-03

2000-04-11

Klimowicz, William

Dynamic information storage or retrieval

Storage medium structure

Specified center hole or locating structure

369286, G11B 724

Patent

active

060495227

ABSTRACT:
A turntable is a table mounted to a shaft (4) of a spindle motor and the turntable supports a laminated disc thereon and drives the disc in rotation. The laminated disc includes a lower disc and an upper disc stacked on the lower disc, and is supported on a disc-supporting surface. When the disc is loaded on the turntable, a fitting member fits into the center hole of the laminated disc for centering the laminated disc with respect to the shaft. The fitting member fits the center hole of the lower disc when the laminated disc is supported on said disc-supporting surface. The turntable may include a tapered member which guides the laminated disc to the disc-supporting surface. The laminated disc includes lower and upper discs each having an edge which defines the center hole. The corners of the edges are cut away along a circumference of the center hole. The upper and lower discs are placed together so that the cut-away corner directly face each other.

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