Metal working – Method of mechanical manufacture – Electrical device making
Patent
1995-02-06
1998-07-14
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
2960315, G11B 542
Patent
active
057785147
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates generally to magnetic data storage devices, and particularly to heads for use in high density data storage and retrieval.
2. Description of the Prior Art
A read/write head is used to record and store information on a rotating magnetic disk or magnetic tape, and also to read back the stored information. A typical mass storage device stores information on spinning magnetic disks, the information being recorded in the form of transitions in magnetic flux on the magnetic surface of the disk. In particular, the data is recorded in a plurality of tracks, with each track being a selected radial distance from the center of the disk. The number of transitions per inch along the track defines the bits per inch (BPI), and the number of tracks per inch along the radial distance defines the tracks per inch (TPI). The product of the BPI and the TPI defines the areal density stored in the magnetic film on the disk. A read/write head flies in close proximity to the disk surface and is held in approximate radial position over the disk by an arm. Under the control of the system's processor unit the arm can move the read/write head to the appropriate track in which the data is recorded so that it may be read, or into which data is to be written.
A commonly used inductive read/write head comprises two pole pieces formed from a magnetic material and a write coil. At one end, the pole pieces are touching and at the other end there is a slight gap between the pole pieces. The head is positioned so that the gap is directed towards the disk surface. When electric current is impressed on the coil, a magnetic flux is generated, which is impressed upon the pole pieces. The width of the poles along the track direction corresponds to the width of the track in which information is recorded by this head. The smaller the pole width, the narrower is the track, thereby increasing TPI, which is the trend of the future in high density recording.
At the gap between the poles, the magnetic flux is directed through the magnetic material in the adjacent disk surface to thereby impress magnetic flux therein. A head with a thinner gap writes narrower transitions, thereby increasing BPI. Higher BPI and higher TPI increases areal density, thereby allowing storage of more information in one square inch of the disk surface. This higher storage density is very desirable for miniaturized disk drives with high information storage capacity, as needed for many computers, e.g., PCs, workstations, laptops, notebooks, and the like.
When data is being written onto a disk, the coil is energized with a varying current pattern which corresponds to the data to be written. The varying current results in the generation of the corresponding pattern in the magnetic flux which the head applies to the surface of the rotating disk. Since the disk moves relative to the head, the magnetic flux on the disk surface also varies along the length of the arc traversed by the head on the disk.
When the data is read, the head flies over the arc of the disk surface in which the data was written. A small amount of flux from the disk permeates mostly into the poles of the head. The flux in the head varies in response to the pattern of flux recorded on the disk. The varying flux results in the generation of a varying voltage in the coil, which, in turn, is sensed as the previously-recorded data.
FIG. 1 is a perspective view to show a prior art composite head for computers which comprises a rectangular block-like slider 1 extending in running direction of the magnetic disk, two or more raised rails 2, 3 provided on the slider surface facing the disk, and a recess 4 formed at the tip end of the slider 1 in the longitudinal direction extending through the sides of the slider. A groove 8 is formed along the running direction of the disk at the tip end of the slider 1 in one of the rails 2. A head core 5 is inserted into the groove, and an interstice between the groove 8 and the core 5 is filled with fused glass. In th
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DAS Devices, Inc.
Hall Carl E.
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