Magnetic disk apparatus employing liquid bearing type or physical contact type magnetic head slider
First Claim
1. A magnetic storage apparatus including a substantially non-flexible magnetic recording medium, a magnetic head slider having a reading/writing element mounted therein and liquid lubricant provided on the surface of said magnetic recording medium, wherein said liquid lubricant comprises a liquid in a Newtonian range in which viscosity thereof is substantially constant irrespective of a shear rate or a liquid having the property that actual viscosity is increased with increase of the shear rate and said magnetic head slider maintains a gap between said slider and said magnetic recording medium to perform reading and writing while being moved on said liquid lubricant intermittently or continuously in a contact manner with said liquid lubricant, and comprising means for maintaining a flying height which is a distance of said gap constant even if a movement speed is varied, wherein the shear rate is determined by the speed of rotation of said magnetic recording medium divided by the flying height of said magnetic head slider.
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Accused Products
Abstract
A magnetic storage apparatus includes a substantially non-flexible magnetic recording medium, a magnetic head slider having a reading/writing element mounted therein and liquid lubricant provided on the surface of the magnetic recording medium. The liquid lubricant is a liquid in a Newtonian range having a viscosity which is substantially constant irrespective of a shear rate or a liquid having the property that the actual viscosity is increased with increase of the shear rate. The magnetic head slider maintains a gap between the slider and the magnetic recording medium to perform reading and writing while being moved on the liquid lubricant intermittently or continuously in a contact manner with the liquid lubricant. There is provided a device for maintaining a constant flying height even if a movement speed is varied, which flying height is represented by the size of the gap. Thus, the magnetic storage apparatus of the liquid bearing system or the contact system has only very small forces such as liquid drag force and friction force or sticking force and is capable of performing stable slider movement, performing high-speed seeking operation with high reliability and performing high-density recording.
44 Citations
37 Claims
- 1. A magnetic storage apparatus including a substantially non-flexible magnetic recording medium, a magnetic head slider having a reading/writing element mounted therein and liquid lubricant provided on the surface of said magnetic recording medium, wherein said liquid lubricant comprises a liquid in a Newtonian range in which viscosity thereof is substantially constant irrespective of a shear rate or a liquid having the property that actual viscosity is increased with increase of the shear rate and said magnetic head slider maintains a gap between said slider and said magnetic recording medium to perform reading and writing while being moved on said liquid lubricant intermittently or continuously in a contact manner with said liquid lubricant, and comprising means for maintaining a flying height which is a distance of said gap constant even if a movement speed is varied, wherein the shear rate is determined by the speed of rotation of said magnetic recording medium divided by the flying height of said magnetic head slider.
- 32. A magnetic storage apparatus including a substantially non-flexible magnetic recording medium, a magnetic head slider having a reading/writing element mounted therein and liquid lubricant provided on the surface of said magnetic recording medium, wherein said liquid lubricant comprises a liquid in a Newtonian range in which viscosity thereof is substantially constant irrespective of a shear rate or liquid having the property that actual viscosity is increased with increase of the shear rate and said magnetic head slider includes a movement surface having at least a curved surface with a curvature in a main moving direction and a direction perpendicular to said moving direction and a rear end surface in the moving direction constituted by one or more substantially flat surfaces, said magnetic head slider maintaining a gap between said slider and said magnetic recording medium to perform reading and writing while being moved on said liquid lubricant intermittently or continuously in a contact manner with said liquid lubricant, and comprising means for maintaining a flying height which is a distance of said gap constant even if a movement speed is varied, wherein the shear rate is determined by the speed of rotation of said magnetic recording medium divided by the flying height of said magnetic head slider.
Specification