Conning motor hub surface apparatus for hard disk drives

Abstract

A disk mounting hub has a disk-mounting face formed at one end as a truncated conical surface of revolution symmetric about a central axis. A cylindrical inner hub member is coaxial with the hub body outside diameter and the surrounding mounting face. The inner hub member is adapted to receive a planar disk with a central opening. The mounting face is disposed at a hub face angle (n/2+/−1) relative to the central axis. Hub face angle Ω is selected so that a disk clamping force F applied to an inner disk portion surrounding the opening bends a portion of the disk interior to the hub inside diameter to conform with the conical disk-mounting face. This interior bending portion reduces or eliminates the tendency of the outer disk portion to form an excessive conning angle Φ.

1 . A disk mounting hub for mounting a disk on an axial hard disk spindle in which said disk has opposite parallel faces between a disk outside diameter and a coaxial disk inside diameter defining a central opening there through, as a product of the process comprising the steps: 
 defining a rigid cylindrical hub body having a hub outside diameter disposed along a central axis;    defining a cylindrical disk-mounting member disposed coaxial with said central axis at one end of said body;    defining a coaxial member to extend proximally with an inside diameter from said one end of said body;    sizing said member inside diameter to be received through said disk opening;    defining a coaxial hub face extending between said hub outside diameter and said member inside diameter adjacent to said one end of said hub as a truncated conical section of revolution symmetrical about said axis, in which said conical surface is disposed at an oblique hub face angle Ω relative to said axis; and    wherein said hub face angle Ω acts to minimize a disk conning angle D when said disk is clamped to said hub face.    
   
   
       2 . The disk mounting hub of  claim 1 , wherein said process further comprising the step: 
 selecting said angle Ω so that:    with said disk mounted perpendicular to said hub axis and fitted with said disk inside diameter around said mounting member inside diameter with one disk face proximal and adjacent to said hub face;    and a predetermined clamping force F applied toward said hub face from said opposite disk face over an interior central portion of said opposite disk face;    then said interior central portion of said disk bends toward essentially conical contiguity with said truncated conical hub face surface at said oblique hub face angle  0  and away from parallel to the remaining exterior portion of said disk, while said remaining exterior portion of said disk remains disposed within an acute disk conning angle Φ limit relative to a perpendicular to said axis.    
   
   
       3 . The disk mounting hub of  claim 1 , wherein said oblique hub face angle Ω is selected to form a hub face having a convex conical surface contour.  
   
   
       4 . The disk mounting hub of  claim 1 , wherein said oblique hub face angle Ω is selected to form a hub face having a convex conical surface contour.  
   
   
       5 . The disk mounting hub of  claim 1 , wherein said disk mounting hub is defined from materials are selected from the group consisting of aluminum and steel.  
   
   
       6 . The disk mounting hub of  claim 1 , wherein said process further comprises: 
 a step in which a clamping force F is applied to said opposite disk face by a clamping member attached to a hub-mounting member.    
   
   
       7 . The disk mounting hub of  claim 1 , wherein said process further comprises the step: 
 providing a hub-mounting clamp member to include an axial-acting spring member between a disk contact end in contact with said opposite disk surface and a rigid base end mounted to a hub mounting member at its extreme proximal end wherein said hub-mounting clamp member is arranged to exert a clamping force F on said disk surface toward said disk mounting hub.    
   
   
       8 . The disk mounting hub of  claim 1 , 
 wherein said hub face angle Ω acts to minimize a disk conning angle Φ when said disk is clamped toward said hub face.    
   
   
       9 . A hard disk drive, comprising: said disk mounting hub of  claim 1  coupling to said disk.  
   
   
       10 . The hard disk drive of  claim 9 , comprising: said disk mounting hub of  claim 1  coupling to said disk.