Optical memory disc

Details Optical memory disc Optical memory disc

G - Physics

11

B

181/25

G11B 3/00 (2006.01) G11B 7/24 (2006.01) G11B 7/26 (2006.01) G11B 23/00 (2006.01)

Patent

CA 1224161

ABSTRACT OF THE DISCLOSURE An optical memory disc includes a glass substrate on which a plurality of concentric circular guide grooves or a spiral groove are formed for tracking purposes. A centering plate is secured to the glass substrate in a manner such that the center of a circular opening formed in the centering plate is exactly coincident with the center of the plurality of concentric circular guide grooves or the spiral groove. The circular opening formed in the centering plate is utilized to drive the optical memory disc on a turntable. Since the circular opening is not formed directly in the glass substrate, the center adjustment is easily achieved, and there is no possibility that the glass sub- strate will be damaged when the circular opening is formed.

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