Clamping plate, cartridge case, information medium, mold, and method of manufacturing clamping plate
AssigneeTDK Corporation
InventorsHiroshi Kaneda, Masaru Ikebe, Kenji Hashizume
Life of this patent
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Abstract
A clamping plate capable of reliably clamping a disk-shaped medium. In the clamping plate, at an imaginary intersecting portion between an imaginary extended surface of a rear surface of an outer peripheral portion of a main body and an imaginary extended surface of a rear surface of an inner peripheral wall of the main body, an annular groove recessed from the imaginary extended surfaces in the directions of the thicknesses of the outer peripheral portion and the inner peripheral wall is formed along an imaginary cross line of the imaginary extended surfaces.
Claims7
A clamping plate for a disk-shaped medium driven by a disk drive, including a main body comprising:
- a recess circular in plan view formed in a central portion thereof, the recess having an inner peripheral wall inclined such that the recess is gradually reduced in diameter from an opening toward a bottom thereof;
- and
- an outer peripheral portion formed by an annular plate body such that the outer peripheral portion surrounds the opening,
- wherein the main body has a groove formed at an imaginary intersecting portion between an imaginary extended surface of a rear surface of the outer peripheral portion and an imaginary extended surface of a rear surface of the inner peripheral wall, along an imaginary line of intersection of the two imaginary extended surfaces, the groove being recessed from the two imaginary extended surfaces.
A mold for manufacturing a clamping plate by pressing a plate material, the clamping plate including a main body comprising:
- a recess circular in plan view formed in a central portion thereof, the recess having an inner peripheral wall inclined such that the recess is gradually reduced in diameter from an opening toward a bottom thereof;
- and
- an outer peripheral portion formed by an annular plate body such that the outer peripheral portion surrounds the opening,
- wherein the mold comprises a first forming surface that forms a rear surface of the outer peripheral portion, and a second forming surface that forms a rear surface of the inner peripheral wall, and
- wherein the mold has a protrusion formed at an imaginary intersecting portion of an imaginary extended surface of the first forming surface and an imaginary extended surface of the second forming surface, along an imaginary line of intersection of the two imaginary extended surfaces, the protrusion protruding from the two imaginary extended surfaces.
A method of manufacturing a clamping plate by pressing a plate material, the clamping plate including a main body comprising:
- a recess circular in plan view formed in a central portion thereof, the recess having an inner peripheral wall inclined such that the recess is gradually reduced in diameter from an opening toward a bottom thereof;
- and
- an outer peripheral portion formed by an annular plate body such that the outer peripheral portion surrounds the opening,
- wherein the clamping plate is manufactured by pressing a protrusion of a mold against the plate material, the mold comprising a first forming surface that forms a rear surface of the outer peripheral portion, and a second forming surface that forms a rear surface of the inner peripheral wall, the protrusion being formed at an imaginary intersecting portion of an imaginary extended surface of the first forming surface and an imaginary extended surface of the second forming surface, along an imaginary line of intersection of the two imaginary extended surfaces, the protrusion protruding from the two imaginary extended surfaces.
Dependencies are inferred from the claim text.