Patent ID: 8481141

Claim:
A digital video disc, consisting essentially of: a single solid piece of plastic material defining a substrate having a top surface and a bottom surface, the substrate defined by: a central portion defined by a central spindle aperture and an outer portion, said central portion defined by a dome structure having a maximum thickness and said outer portion having a maximum thickness, said dome structure maximum thickness being greater than said outer portion maximum thickness, said dome structure comprising four or more upwardly-turned dimples extending upwardly from said top surface of said central portion, said dimples in relative spaced relation with each other and with said central spindle aperture; and said central portion is further defined by a central ring protruding downwardly from said bottom surface of said central portion, said central spindle aperture formed through said central ring, and said central ring extending radially to a distance of approximately 32 millimeters from an outer edge defined by said central spindle aperture, with said bottom surface of said outer portion radially beyond said central ring being devoid of any grooves formed therein.