A REPRODUCING HEAD IN A LIQUID MEDIUM

• US 3,579,212 A
• Filed: 03/05/1968
• Issued: 05/18/1971
• Est. Priority Date: 03/05/1968
• Status: Expired due to Term

• Current Assignee: Andrew Gabor
• Original Assignee: Andrew Gabor
• Inventors: Gabor, Andrew
• Application Number:
  US04/710,506
• Time in Patent Office: 1,169 Days
• US Class Current: 360/234.1
• CPC Class Codes: G11B 17/32 Maintaining desired spacing between record carrier and head, e.g. by fluid-dynamic spacing damping of vibrations of record carriers on turntables by fluid-dynamic means G11B19/2018
• CPC Class Codes: G11B 5/6005 Specially adapted for spacing from a rotating disc using a fluid cushion

Abstract

High density storage magnetic recording systems are described in which the reproducing transducers must be positioned in accurately maintained close proximity to the surface of the recording medium. Both transducers and recording medium are immersed in a liquid so that relative motion between the recording surface and the transducers develops a liquid film of controlled thickness for maintaining uniform close spacing.

Claims

1. A method of bearing the continuous, flying surface of a reproducing head adjacent to the surface of a recording medium comprising:

completely immersing said medium and said head in a liquid, resiliently supporting said head, positioning said continuous flying surface of the head in proximity to said surface of the recording medium, providing relative motion between said head and said medium, urging said continuous, flying surface against said medium, selecting the velocity of said relative motion, said urging force, and the viscosity of said liquid such that the fluid pressure between the adjacent surfaces of said head and said medium maintains a uniform spacing therebetween.

2. A method of bearing a reproducing head according to claim 1 wherein said head and said medium comprises magnetic reproducing means.

3. A method of bearing a reproducing head according to claim 2 wherein said reproducing means is a magnetic disc reproducing system.

4. A reproducing system comprising:

a reproducing head having a continuous, flying surface, a disc recording medium, a liquid filled container, means to support said head and said medium within said container immersed in said liquid, said means including means to resilienTly urge said head against said medium, and means to provide relative motion between said head and said medium such that when said relative motion is provided, a liquid film is formed between the adjacent surfaces of said head and said medium conforming to the differential equation;

where x is the coordinate in the direction of motion, y is the coordinate perpendicular to the motion in the plane of the liquid film, h is the coordinate perpendicular to said film, p is the fluid pressure between said adjacent surfaces, Mu is fluid viscosity and V is relative velocity between said adjacent surfaces.

5. A reproducing system according to claim 4 in which said means to resiliently urge said head against said medium comprises means to hold said head out of contact with said medium in the absence of said relative motion.

6. A high density magnetic storage system comprising:

a. a magnetic storage disc having storage surface;

b. support means for supporting said disc for rotation;

c. magnetic transducer means, having a continuous, flying surface;

d. positioning means for resiliently supporting said transducer means, said positioning means connected to said support means for positioning said transducer in a selected position adjacent to said storage surface;

e. a housing surrounding both said disc and said transducer means;

f. a liquid contained by said housing completely surrounding said disc and said transducer means; and

, g. means to rotate said disc whereby a pressurized film of said liquid develops between said transducer means and said surface conforming to the equation;

where p is the pressure in said film, x is the coordinate in the direction of motion, y is the coordinate perpendicular to the motion in the plane of said film, h is the coordinate perpendicular to said film, Mu is fluid viscosity of said liquid and V is relative velocity between said disc and said transducer.