Center core for disc-shaped recording medium and process of producing same
AssigneeSony Corporation
InventorsKiyoyuki Miyata, Hiroshi Meguro
Life of this patent
Estimating the term…
Abstract
A center core for a disc-shaped recording medium. The center core comprises a flange section for supporting the disc-shaped recording medium. A generally cylindrical section having a bottom wall is formed integral with and located radially inward of the flange section. A plurality of supportable standard sections are formed at the bottom wall of the cylindrical section by making a press working on the bottom wall of the cylindrical section in a manner to project toward the lower surface side of the center core. The supportable standard sections define a supportable surface through which the center core is placed on a turn table of a disc drive device.
Claims5
A center core for a disc-shaped recording medium, comprising:
- a flange section for supporting the disc-shaped recording medium;
- a generally cylindrical section having a bottom wall, disposed radially inward of said flange section;
- and
- a plurality of separated supportable standard sections formed at the bottom wall of said cylindrical section so as to extend radially and have respective axes located at intervals of about 120° in peripheral angle, said supportable standard sections defining a generally flat supportable surface by which said center core is placed on a turntable of a disc drive device.
A process of producing a center core for a disc-shaped recording medium, said process comprises the following steps:
- forming a pilot through-hole and a plurality or arcuate cutouts in a metal sheet, said cutouts being circularly arranged around said pilot through-hole so that a non-cutout portion is located between said adjacent cutouts;
- press working a part located radially inward of said circularly arranged cutouts so as to form a flange section and a generally cylindrical section having a bottom wall;
- burring said pilot through-hole so as to form a spindle shaft insertion hole:
- forming a drive pin engagement hole located radially between said spindle shaft insertion hole and a peripheral cylindrical wall of said cylindrical section;
- press working the bottom wall of said cylindrical section to form a shallow dish-shaped generally cylindrical section having a top wall, said shallow dish-shaped generally cylindrical section projecting in a direction of an upper surface side of said metal sheet;
- press working the top wall of said shallow dish-shaped cylindrical section so as to form a plurality of radially extending and separated supportable standard sections which project in a direction of a lower surface side of said metal sheet which extend radially and have respective axes located at intervals of about 120° in peripheral angle, said supportable standard sections defining a generally flat supportable surface by which said center core is supportable on a turntable of a disc drive device;
- and
- cutting out said non-cutout portions each located between said adjacent cutouts.
Dependencies are inferred from the claim text.