Rigid magnetic disk drive head disk assembly and enclosure structure

• US 5,081,552 A
• Filed: 01/31/1989
• Issued: 01/14/1992
• Est. Priority Date: 01/31/1989
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Misso, Nigel F., Schopp, Robert E., Greenberg, Richard, Glaser, Thomas W.
• Primary Examiner(s): Tupper, Robert S.
• Application Number:
  US07/304,996
• Time in Patent Office: 1,078 Days
• Field of Search: 360/98.01, 360/97.03, 360/98.07
• US Class Current: 360/98.01
• CPC Class Codes: G11B 25/043 using rotating discs
• CPC Class Codes: G11B 33/08 Insulation or absorption of undesired vibrations or sounds
• CPC Class Codes: G11B 33/121 the apparatus comprising a single recording/reproducing device
• CPC Class Codes: G11B 33/1493 Electro-Magnetic Interference [EMI] or Radio Frequency Interference [RFI] shielding; grounding of static charges
• CPC Class Codes: G11B 5/4813 Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm G11B5/484 takes precedence
• CPC Class Codes: G11B 5/5578 Multiple actuators addressing the same disk, e.g. to improve data rate or access rate
• CPC Class Codes: Y10S 360/903 Physical parameter, e.g. form factor

Abstract

A structure and organization for a magnetic disk drive provides for optimizing the volumetric storage density within a device form factor by optimizing the number of disks. The spindle and dual rotary actuators are respectively supported at each side by a pair of support plates that are separated and supported by not only the spindle and actuator shafts, but also the voice coil motor core pieces and tie plates which carry shock mounts. This head-disk assembly is shock mounted in the lower part of a two part enclosure wherein the enclosure parts are aligned and separated by elastomer guides and the separation covered by a compliant tape to complete the enclosure. Both actuators use a common servo surface while one actuator carries upwardly facing transducers and the other downwardly facing transducers so that each arm extending between disks mounts, but a single suspension-transducer assembly to reduce interdisk spacing. The enclosure occupies the entire vertical height of the form factor and the head-disk assembly occupies the full available height of the enclosure interior to accommodate as many disks as possible. Electrical components are excluded from the axial sides of the stack of disks.

Claims

1. A magnetic rigid disk storage device, contained within a form factor that predetermines the length, width and height of said device, comprising

a plurality of hard disks mounted on a spindle for rotation in unison;

rotary voice coil actuator means which pivots about the axis of an actuator shaft and carries magnetic transducers, each adapted to be moved from one track location to another track location with respect to an associated disk data surface;

supporting means for rotatably supporting said spindle and supporting said actuator shaft;

said support means comprising a pair of parallel plate members each of which supports one end of said spindle and one end of said actuator shaft, said support means further including voice coil motor core elements that are rigidly connected to each of said parallel plate members;

said plate members being formed of sheet metal with elongated embossments one one of said plates extending in a direction predominantly 90 degrees displaced with respect to the embossments on the other of said plates;

motor means for rotating said disks, which is supported by said support means and is mounted coaxially with said spindle;

shock mounting means for damping vertical and horizontal shock loading experience by said support means;

enclosure means cooperating with said support means to enclose and substantially seal said hard disks and said actuator;

the sum of the vertical dimensions of said spindle axial dimension, support means, enclosure means and the vertical sway space required by said shock mounting means occupying substantially the total height of said form factor; and

device electrical components exterior of said enclosure means being mounted within said form factor radially outward from said plurality of disks.

2. The magnetic rigid disk storage device of claim 1 wherein said support means plate members each further include flanged margins.

3. The magnetic rigid disk storage device of claim 1 wherein said enclosure means comprises

a two part cover with upper and lower parts having aligned edge surfaces;

elastomer locating means that locate, align and maintain a separation between said upper and lower cover parts; and

tape sealing means for continuously closing the separation between said upper and lower cover parts.

4. The magnetic rigid disk storage device of claim 3 wherein

said actuator, said spindle with said hard disks and said support means form a head-disk assembly (HDA);

said tape sealing means comprises a thin compliant metal tape; and

said cover parts are drawn metal parts;

whereby in the assembled condition said enclosure means provides a continuous metal shield surrounding said HDA.

5. The magnetic rigid disk storage device of claim 4 wherein said shock mounting means comprises a shock mounted connection of said HDA within said lower cover part.

6. A rigid magnetic data storage device comprising

a spindle assembly which carries a plurality of disks for rotation in unison about the axis of said spindle assembly;

motor means mounted coaxially with respect to said spindle;

a rotary actuator pivotable about a second axis to move magnetic transducers carried thereby from one track location to another track location on an associated disk data surface;

a frame member having parallel wall portions which support both said spindle assembly and said rotary actuator at each axial end to form a head-disk assembly;

a two part cover means surrounding and sealing said head-disk assembly; and

connecting means including plural shock mounting means, interconnecting one of said cover means and said head-disk assembly for supporting said head-disk assembly within said cover means.

7. The rigid magnetic disk data storage device of claim 6 wherein said cover means have aligned edge surfaces and said device further comprises

elastomer guide means which maintain said cover edge surfaces in aligned, but separated orientation;

and

sealing means covering the separation between said cover means parts to enclose and seal said hard disk assembly within said cover means.

8. The rigid magnetic disk data storage device of claim 7 wherein said sealing means is a thin compliant tape.

9. The rigid magnetic disk data storage device of claim 8 wherein said sealing means is a thin compliant metal tape and said cover means is formed of drawn metal parts to form a continuous shielding enclosure about said head-disk assembly.

10. The rigid magnetic disk data storage device of claim 9 wherein the length, with and height of the device are predetermined by the dimensions of an established form factor, said cover means occupies the full vertical height of said form factor and said head-disk assembly occupies the full internal height of said enclosure means less a clearance that accepts the vertical sway of said shock mounting means.

11. The rigid magnetic disk data storage device of claim 10 wherein said cover means enclosed head-disk assembly occupies the full height and width of said form factor and said device further comprises

an electrical component assembly exterior of said enclosure means positioned at one side of said disk stack and occupying the space between said cover means and the end of said form factor.

12. The rigid magnetic disk data storage device of claim 11 wherein said electrical component assembly is carried by a single flexible circuit assembly that is folded to support the electrical components mounted thereon in different planes.

13. The rigid magnetic disk data storage device of claim 12 wherein said single flexible circuit assembly least partially enclosed by metal wall surfaces that provide mechanical support and heat dissipation.