Dynamic magnetic information storage or retrieval – Fluid bearing head support – Disk record
Reexamination Certificate
1999-07-13
2001-01-09
Tupper, Robert S. (Department: 2754)
Dynamic magnetic information storage or retrieval
Fluid bearing head support
Disk record
Reexamination Certificate
active
06172851
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic disk drive and, more particularly, to a flying magnetic head slider capable of recording and reproducing data while flying slightly above a recording medium due to an air bearing.
A magnetic disk drive applicable to a computer as an external storage includes a magnetic head for recording and reproducing data out of a recording medium. The head is mounted on a magnetic head slider facing the recording medium and capable of flying to a preselected height above the medium. While the medium spins, the resulting viscous flow of air is born by an air bearing surface facing the medium. The slider therefore flies slightly above the medium due to an air bearing available with the air bearing surface. The head is mounted on the air outlet end portion of the air bearing surface and oriented toward the medium. During the flight of the slider, the head records or reproduces data in or out of the medium without contacting the medium.
The slider of the type described is brought to a desired track by a positioner while seeking the medium. Specifically, with such a rotary actuator type positioner, to access data, the slider seeks the medium from the innermost circumference to the outermost circumference of the track. This brings about a problem that the pressure acting on the air bearing surface depends on the radial position of the track of the medium because the velocity of the viscous flow of air depends on the radial position of the track. As a result, the flying height of the slider differs from one radial position to another radial position of the track. Moreover, the yaw angle between the direction tangential to the medium and the longitudinal axis of the slider differs from the innermost circumference to the outermost circumference. A change in yaw angle causes the air stream flowing along the air bearing surface to vary, thereby varying the pressure distribution. This also causes the flying height of the slider to fluctuate.
A change in the flying height of the slider directly translates into a change in electromagnetic transduction efficiency available with the head and thereby deteriorates a signal-to-noise ratio. To implement high density CDR (Constant Density Recording) required of a magnetic disk, it is necessary to maintain a high BPI (Bit Per Inch) over the entire track area. It is therefore extremely important to guarantee the constant flying height of the slider over the entire track area.
Technologies relating to the present invention are also disclosed in, for example, Japanese Patent Laid-Open Publication Nos. 61-160885, 3-125378 and 4-228157.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a flying magnetic head slider allowing a minimum of change to occur in flying height without regard to the radial track position and thereby ensuring a stable flying height over the entire track area.
It is another object of the present invention to provide a flying magnetic head slider allowing a minimum of change to occur in recording and reproducing characteristics and thereby implementing high density CDR.
In accordance with the present invention, a magnetic head slider having an air bearing surface and capable of flying due to an air bearing between the air bearing surface and a recording medium includes a leading rail formed at an air inlet side on the air bearing surface. A pair of trailing rails extend from substantially the center of the leading rail toward an air outlet, then bend away from each other, and then respectively extend toward the right end and left end of the air outlet end while sequentially increasing in width.
Also, in accordance with the present invention, a magnetic head slider having an air bearing surface and capable of flying due to an air bearing between the air bearing surface and a recording medium includes a generally C-shaped leading rail formed at an air inlet end on the air bearing surface and concave toward an air outlet end. A pair of trailing rails extend from substantially the center of the concavity of the leading rail toward the air outlet end, then bend away from each other, and then respectively extend to the right end and left end of the air outlet end while sequentially increasing in width.
Furthermore, in accordance with the present invention, a magnetic header slider having an air bearing surface and capable of flying due to an air bearing between the air bearing surface and a recording medium includes an air inlet end and an air outlet end formed by separating the air bearing surface. A generally E-shaped leading rail is formed at the air inlet end and concave toward the air outlet end. A pair of triangular trailing rails are respectively located at the right end and left end of the air outlet end.
Moreover, in accordance with the present invention, a magnetic head slider having an air bearing surface and capable of flying due to an air bearing between the air bearing surface and a recording medium includes an air inlet end and an air outlet end formed by separating the air bearing surface. A generally E-shaped leading rail is concave toward the air outlet end. Three subrails extend toward the air outlet and are separated from each other by a pair of parallelogrammatic recesses which are symmetrical to each other with respect to the longitudinal axis of the slider. A pair of triangular trailing rails are respectively located at the right end and left end of the air outlet end and symmetrical to each other with respect to the longitudinal axis of said slider.
In addition, in accordance with the present invention, a slider having an air bearing surface including an air inlet end and an air outlet end, and capable of flying due to an air bearing between the air bearing surface and a recording medium includes three leading rails respectively extending out from the right end, left end and center of the air inlet end. A pair of side rails extend toward the air outlet end and are respectively formed at the right end and left end of the slider. The side rails each extends while sequentially decreasing in width, and terminates before reaching the air outlet end. A center rail extends from the center of the air inlet end toward the air outlet end and then bifurcates into a pair of branch rails. The branch rails respectively extend to the right end and left end of the air outlet end while sequentially increasing in width.
REFERENCES:
patent: 5353180 (1994-10-01), Murray
patent: 5406432 (1995-04-01), Murray
patent: 5739981 (1998-04-01), Cha et al.
patent: 5894379 (1999-04-01), Koishi et al.
patent: 5926343 (1999-07-01), Dorius et al.
patent: 5953181 (1999-09-01), Utsunomiya
patent: 61-160885 (1986-07-01), None
patent: 3-125378 (1991-05-01), None
patent: 4-228157 (1992-08-01), None
NEC Corporation
Sughrue Mion Zinn Macpeak & Seas, PLLC
Tupper Robert S.
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