Turntable for rigidly mounting thin flexible magnetic discs

Claim 2

A turntable suitable for rigidly mounting for rotation a magnetic recording medium supported on a thin flexible disc comprising: a substantially flat circular member having a diameter substantially larger than the separation between the two substantially planar side surfaces of the member; means located on one side of said circular member for supporting said circular member for rotation about an axis in alignment with the center of the circular member; means centrally located on the other substantially planar side surface of the circular member for supporting for rotation therewith a thin flexible disc in concentric spaced relationship with the said other substantially planar side surface; and fluid pumping means located within the circular member for establishing at least a partial vacuum between the said other substantially planar side surface of the circular member and an operatively mounted thin flexible disc when the circular member is rotated.

Claim 3

A turntable as set forth in claim 1 in which said fluid pumping means located within the circular member comprises a plurality of spaced radially oriented grooves formed in the said other substantially planar side surface of the said circular member.

Claim 4

A turntable as set forth in claim 1 in which the means for supporting a thin flexible disc includes: a substantially conical member attached to and aligned with the axis of the circular member; a first hub member having a central substantially conical aperture therethrough for mounting on the conical member and a plurality of fastening means; and a second hub member cooperating with the said fastening means on the first hub member for clamping a thin flexible disc therebetween.

Claim 5

A turntable as set forth in claim 3 in which the said other substantially planar side surface of the circular member is provided with a centrally located cavity extending radially at least as far as the first hub member to position a clamped disc in substantial contacting alignment with the substantially planar side surface of the circular member and the grooves in the said other surface provide fluid communication between the cavity and the periphery of the circular member.

Claim 6

A rigid magnetic recording disc suitable for use in data recorders comprising: a rigid circular turntable having a diameter substantially larger than the separation between the two substantially planar side surfaces of the turntable; means attached to one side of the turntable for supporting said turntable for rotation about its axis; a thin flexible disc having a central opening therein and a coating of magnetic recording material on at least one side thereof; means for supporting said flexible disc in the region surrounding the central opening therethrough in concentric spaced relationship with the other substanTially planar surface of the turntable; and fluid pumping means located within the turntable for establishing at least a partial vacuum between the said other substantially planar side surface of the turntable and the confronting surface of the thin flexible disc when the turntable is rotated whereby the thin flexible disc is rigidly bonded to the turntable by the pressure differential established by the fluid pumping means within the rotating turntable.

Claim 7

A rigid magnetic recording disc suitable for use in data recorders comprising: a rigid circular turntable having a diameter substantially larger than the separation between the two substantially planar side surfaces of the turntable; means attached to one side of the turntable for supporting said turntable for rotation about its axis; a thin flexible disc having a central opening therein and a coating of magnetic recording material on at least one side thereof; means for supporting said flexible disc in the region surrounding the central opening therethrough in concentric spaced relationship with the other substanTially planar surface of the turntable; and fluid pumping means located within the turntable for establishing at least a partial vacuum between the said other substantially planar side surface of the turntable and the confronting surface of the thin flexible disc when the turntable is rotated whereby the thin flexible disc is rigidly bonded to the turntable by the pressure differential established by the fluid pumping means within the rotating turntable.

Claim 8

A magnetic recording disc as set forth in claim 5 in which said fluid pumping means located within the turntable comprise a plurality of spaced radially oriented grooves formed in the said other substantially planar side surface of the said turntable.

Claim 9

A magnetic recording disc as set forth in claim 6 in which the means for supporting the thin flexible disc includes: a substantially conical member attached to and aligned with the rotational axis of the turntable; a first hub member having a central substantially conical aperture therethrough for mounting on the conical member and a plurality of fastening means; and a second hub member cooperating with the said fastening means on the first hub member for clamping the thin flexible disc therebetween.

Claim 10

A magnetic recording disc as set forth in claim 7 in which the said other substantially planar side surface of the turntable is provided with a centrally located cavity extending radially at least as far as the first hub member to position the clamped flexible disc in substantial contacting alignment with the substantially planar side surface of the circular member and the grooves in the said other surface provide fluid communication between the cavity and the periphery of the turntable.