Information recording apparatus with a liquid bearing

• US 5,193,046 A
• Filed: 09/25/1990
• Issued: 03/09/1993
• Est. Priority Date: 10/17/1988
• Status: Expired due to Fees

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Nc. Conner Peripherals
• Inventors: Lemke, James U., McHargue, William B., French, William W.
• Primary Examiner(s): Wolff, John H.
• Application Number:
  US07/590,608
• Time in Patent Office: 896 Days
• Field of Search: 360/97.02, 360/102, 360/103
• US Class Current: 360/97.02
• CPC Class Codes: G11B 23/505 of disk carriers
• CPC Class Codes: G11B 33/148 Reducing friction, adhesion, drag
• CPC Class Codes: G11B 5/6005 Specially adapted for spacing from a rotating disc using a fluid cushion

Abstract

An information storage apparatus is disclosed for reading and/or writing information on a rigid storage medium which includes a liquid bearing interface between the transducer and medium instead of a conventional air bearing. The liquid is a fluorocarbon which has stable, self-lubricating, viscous and high-density properties. In an exemplary embodiment of a cockpit voice recorder/flight data recorder, low-density metallic components or composite parts of the rigid magnetic disk drive assembly with essentially the same density as the liquid achieve a near zero buoyancy configuration that obviates the effects of vibration and acceleration.

Claims

1. An information storage system, comprising:

a storage medium, said storage medium being relatively rigid;

means for rotating said storage medium;

transducer means positioned in a spaced relationship with said storage medium in response to movement of said storage medium for transferring information for storage on said storage medium and to receive stored information from said storage medium;

loading means for exerting a positioning force on said transducer means, said loading force being directed toward said storage medium; and

a liquid bearing provided between and in contact with said storage medium and said transducer means and cooperating with said loading means for supporting said transducer means in said spaced relationship at a distance of less than about 10 micro inches during said movement of said storage medium, said loading means maintaining said transducer means in contact with said liquid bearing.

2. The information storage system of claim 1, wherein said transducer means includes a slider with a plurality of load-bearing surfaces.

3. The information storage system of claim 1, wherein said transducer means has a composite density and said liquid bearing has a specific density substantially equal to said composite density.

4. The information storage system of claim 3, wherein said transducer means is immersed in a liquid including said liquid bearing.

5. The information storage system of claim 1, further including a positioner means for adjusting the relative position of said transducer means with respect to said storage medium in order to locate said transducer means at different portions of said storage medium.

6. The information storage system of claim 5, wherein said positioner means comprises a plurality of movable components having a composite density and said liquid bearing having a specific density substantially equal to said composite density.

7. The information storage system of claim 6, wherein said transducer means is immersed in a liquid including said liquid bearing.

8. An information recording system, comprising:

a storage medium;

transducer means positioned in a spaced relationship with said storage medium or transferring information for storage on said storage medium and to receive stored information from said storage medium;

loading means for exerting a positioning force on said transducer means directed toward said storage medium; and

spacing means, including a liquid extending between and remaining in contact with said storage medium and said transducer means and cooperating with said positioning means, for maintaining said transducer means in said spaced relationship at a distance of between about 6 and 1 micro inches from said storage medium.

9. An information recording system, comprising:

a storage medium, said storage medium being relatively rigid;

means for rotating said storage medium;

transducer means, provided in a spaced relationship with said storage medium for transferring information for storage on said storage medium and receiving stored information from said storage medium;

positioning means for loading said transducer means with a force directed toward said storage medium; and

a liquid damping material provided in contact with and extending between said storage medium and said transducer means for suppressing mechanical oscillations of said transducer means with respect to said storage medium, said liquid dampening material having a thickness not exceeding about 6 micro inches as measured between said transducer means and said storage medium.

10. An information storage system, comprising:

a storage medium;

transducer means positioned in a spaced relationship with said storage medium;

loading means for exerting a positioning force on said transducer means, said positioning force being directed to said medium; and

liquid means provided between said transducer means and said storage medium for supporting said transducer in said spaced relationship at a distance not exceeding about 6 micro inches while suppressing mechanical oscillations of said transducer with respect to said storage medium, said liquid means including a liquid extending between said transducer means and said storage medium.

11. An information storage system, comprising:

a storage medium, said storage medium being relatively rigid;

transducer means, supported in a spaced relationship with said storage medium in response to relative movement between said transducer means and said storage medium, for providing information for storage on said storage medium and receiving information stored on said storage medium;

means for inducing relative movement between said storage medium and said transducer means;

loading means for loading said transducer means against said storage medium; and

a liquid provided between and contacting said transducer means and said storage means and cooperating with said loading means to establish a liquid bearing supporting said transducer means in a closely spaced, information transfer relationship with said storage medium at a distance of less than about 6 micro inches in response to relative movement between said transducer means and said storage medium, said loading means maintaining said transducer means in contact with said liquid bearing and said liquid bearing in contact with said storage medium during relative movement between said transducer means and said storage medium.

12. An information processing system, comprising:

a storage medium for recording information signals;

transducer means closely spaced from said storage medium for transducing information signals to be stored on and read out from said storage medium;

load means for providing a load force to said transducer means, said force being directed toward said storage medium; and

a liquid disposed between and in contact with said storage medium and said transducer means for providing a hydrodynamic force opposing said load force so that said transducer means is supported over said storage medium in a closely spaced relationship at a distance of less than about 6 micro inches.

13. An information storage system, comprising:

a storage medium, said storage medium being relatively rigid;

means for rotating said storage medium;

transducer means, supported in a closely spaced relationship with said storage medium in response to movement of said medium, for transducing information signals for storage on and receipt from said storage medium;

loading means for exerting loading force on said transducer means, said loading force being directed toward said storage medium; and

a liquid bearing provided between and contacting said storage medium and said transducer means and cooperating with said loading means for supporting said transducer means in a closely spaced flying relationship with said storage means at a distance of less than about 6 micro inches.

14. The information storage system of claim 13, wherein the storage medium comprises a disk of the Winchester type and the liquid bearing supports transducer means in a closely space relationship of less than 6 micro inches.

15. The information storage system of claim 13, wherein the transducer includes a slider having four pads, each pad for contacting the liquid bearing.

16. The information storage system of claim 15, wherein said liquid bearing supports said slider in a closely spaced relationship with said storage means of less than 6 micro inches.

17. The information storage system of claim 15, in which each of the 4 pads includes a leading edge, the leading edge being beveled.

18. The information storage system of claim 13 further including a hermetically sealed enclosure containing said storage medium, said transducer means, said loading means, and said liquid bearing.

19. The information storage system of claim 13, wherein said liquid bearing comprises a liquid fluorocarbon.

20. An information recording system, comprising:

a storage medium;

means for rotating said storage medium at an operational rotational velocity;

transducer means for providing information for storage on said storage medium and for receiving stored information from said storage medium;

positioning means for loading said transducer means with a force directed toward said storage medium; and

liquid damping means, including a liquid extending between said storage medium and said transducer means, for suppressing mechanical oscillations of said transducer means with respect to said storage medium while said transducer means is supported in a closely spaced relationship with respect to said storage medium at a distance of less than about 6 micro inches and said storage medium is rotated at said operational rotational velocity.

21. An information recording system, comprising:

a storage medium;

transducer means positioned in a closely spaced relationship with said storage medium for exchanging information with said storage medium;

loading means for exerting a positioning force on said transducer means, said positioning force being directed toward said storage medium;

a liquid provided between and in contact with said transducer means and said storage medium; and

means for rotating said storage medium within a first rotational velocity range characterized by sliding friction between said transducer means and said storage medium and a second rotational velocity range characterized by the presence of a liquid bearing extending between said transducer means and said storage medium, wherein said liquid bearing supports said transducer means in a closely spaced relationship with said storage medium while suppressing mechanical oscillation of said transducer with respect to said storage medium, said closely spaced relationship being at a distance of less than about 6 micro inches.

22. An information storage system, comprising:

a rotatable storage medium;

means for rotating said rotatable storage medium;

a transducer, flexibly positionable for motion toward and away from said rotatable storage medium, for transferring information for storage on said rotatable storage medium and for retrieval from said rotatable storage medium;

loading means for exerting a positioning force on said transducer directed towards said rotatable storage medium;

liquid means, including a liquid contacting said rotatable storage medium and said transducer, for urging said rotatable storage medium and said transducer into a spaced relation upon rotation of said rotatable storage medium; and

said loading means having a selected magnitude and point of application, and said liquid having a selected viscosity for maintaining said transducer and said storage medium at a selected spacing of not more than about 3 micro inches at a selected storage medium operational rotational velocity.

23. The information storage system of claim 22 wherein said transducer has a composite density and said liquid has a specific density substantially equal to said composite density.

24. A method for improving the transfer of information to and from an information storage system comprising the steps of:

providing a rotatable storage medium adapted for storing information thereon;

rotating said rotatable storage medium at an operational rotational velocity;

providing a transducer flexibly positionable for motion toward and away from said rotatable storage medium for inputting information for storage on said storage medium and for outputting stored information from said rotatable storage medium;

providing loading means for exerting a positioning force on said transducer directed towards said rotatable storage medium;

providing a liquid for urging said rotatable storage medium and said transducer into a spaced relation upon rotation of said rotatable storage medium; and

selecting the magnitude and point of application of said positioning force by loading means against said transducer, and the viscosity of said liquid for maintaining said transducer and said rotatable storage medium at a selected spacing at said operational rotational velocity.