초록 ▼

Hubless optical disc having low radial runout. The optical disc is capable of containing a high capacity of information therein. The optical disc includes a disc substrate having a formatted surface. A mechanism is provided within the disc substrate for mating the optical disc with a drive spindle,

Hubless optical disc having low radial runout. The optical disc is capable of containing a high capacity of information therein. The optical disc includes a disc substrate having a formatted surface. A mechanism is provided within the disc substrate for mating the optical disc with a drive spindle, wherein the formatted surface is concentrically registered relative to the mechanism within the disc substrate. In one embodiment, the mechanism may comprise an annular groove, annular ridge, or a plurality of holes molded in the disc substrate. The present invention includes optical tooling for forming the hubless optical disc having low radial runout. The present invention further includes an optical disc player drive spindle capable of mating with the high-capacity hubless optical disc.

대표청구항 ▼

[ What is claimed:] [1.] A hubless optical disc for the storage of information therein, the optical disc comprising:a disc substrate having a formatted surface, an intermediate region and a central portion, wherein the formatted surface includes a plurality of generally concentric tracks, and wherei

[ What is claimed:] [1.] A hubless optical disc for the storage of information therein, the optical disc comprising:a disc substrate having a formatted surface, an intermediate region and a central portion, wherein the formatted surface includes a plurality of generally concentric tracks, and wherein each track can be defined as a concentric ring or a cycle of a spiral track, and wherein the central portion is proximate the center of the disc substrate and the intermediate region is between the formatted surface and the central portion; andwherein the intermediate region includes a disc alignment mechanism such that the concentric registration of the formatted surface is specified relative to the disc alignment mechanism, including a first annular planar area extending to a first non-planar region followed by a second non-planar region, wherein the first non-planar region is an annular raised area and wherein the second non-planar region is an annular grooved area.