Turntable and disk driving device

A turntable comprising:

• a table portion on which a disk is loaded;
• a shaft supporting structural portion, formed integrally with the central portion of said table portion and said shaft supporting structural portion having a reinforcing structure in which a plurality of thin plate portions intersect, said shaft supporting structural portion is provided substantially perpendicularly to said table portion at a central portion of said table portion in order to support a rotational shaft which rotates said turntable,
• wherein said turntable is formed by injection molding and, when said turntable is injection molded, a gate for an injection mold is disposed in a vicinity of said shaft supporting structural portion at the central portion of said table portion,
• wherein said shaft supporting structural portion further includes a thin-walled cylindrical-shaped fixing portion forming an insertion hole into which the rotational shaft is pressed;
• a thin-walled cylindrical-shaped reinforcing portion provided at an outer circumference side of said fixing portion, said reinforcing portion being concentric with said fixing portion and having a larger diameter than said fixing portion;
• and a reinforcing rib portion provided from said fixing portion to said reinforcing portion in a radial direction of said fixing portion.

A turntable, formed by injection molding, comprising:

• a table portion on which a disk is loaded;
• a thin-walled cylindrical-shaped outer cylindrical portion which is provided at a central portion of said table portion and which fits into an opening of the disk;
• a thin-walled cylindrical-shaped inner cylindrical portion provided at an inner circumference side of said outer cylindrical portion, said inner cylindrical portion being concentric with said outer cylindrical portion and having a smaller diameter than said outer cylindrical portion;
• a rib portion provided from said outer cylindrical portion to said inner cylindrical portion in a radial direction of said inner cylindrical portion;
• and
• a hole passing through the center of the turntable, into which hole a rotational shaft is pressed, and when said turntable is injection molded, a gate for an injection mold is disposed between said inner cylindrical portion and said hole at the central portion of said table portion.

A disk driving device comprising:

• a rotational shaft which is connected to a spindle motor for driving to rotate a disk and which is driven to rotate by the spindle motor;
• and
• a turntable connected to said rotational shaft, on which turntable the disk is loaded, and which turntable rotates the disk, wherein said turntable includes:
• a fixing portion for said rotational shaft, into which fixing portion said rotational shaft is pressed, said fixing portion being elastically deformable in a radial direction of the fixing portion;
• and
• a reinforcer for said fixing portion provided at an outer circumference of said fixing portion, said reinforcer generating reaction force against elastic deformation in the radial direction of said fixing portion, wherein said reinforcer has a reinforcing portion, which is disposed such that a space is provided between said fixing portion and said reinforcing portion, and a connecting portion, which is formed from said portion to said reinforcing portion, and said connecting portion is a plate-shaped member which is formed radially from said fixing portion to said reinforcing portion.