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US4933795A Expired / Lapsed US ⏱️ 0.0 years remaining

Floppy disc read and write head having two separate read and write cores for multiple track density and recording frequencies

Assignee: Fujitsu Ltd
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Filing: 1987-12-07
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Granted: 1990-06-12
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Expires: 2007-12-07
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Abstract

Abstract A magnetic read/write head for a disc drive capable of both high density and low density read/write operations as measured in tracks per inch and employing a magnetic disc capable of having defined thereon a multiplicity of tracks per inch in the disc radial direction. The disc and head have radial and tangential lines of reference relative to each other. The head includes at least one slider having a magnetic high density read/write core gap and a magnetic low density read/write core gap offset relative to each other radially and tangentially on the slider, and a non-magnetic spacer positioned between the magnetic high denisty core gap and the magnetic low density core gap of the slider. Preferably there is provided a second slider having the same structure as described above, wherein the disc is positionable between the first and second sliders for read/write operations of the disc drive. In this embodiment, the high denisty core gap of the first slider is located opposite the non-magnetic spacer of the second slider, and the low density core gap of the first slider is located opposite the non-magnetic spacer of the second slider. Preferably, the low density core gaps of the first and second sliders are aligned along a common radial line and the high density core gaps of the first and second sliders are aligned in a line skewed a predetermined distance from the common radial line along which the low density core gaps of the first and second sliders are positioned.

Inventors

  • 👤 Anil K. Nigam

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 15:53
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265; G11B19/00; G11B5/48; G11B5/58; G11B5/596; G11B5/59633

Claims Analysis

Total Claims: 17
Claim 1
Independent Claim 115 words
A magnetic read/write head for a disc drive capable of both high density and low density read/write operation as measured in tracks per inch and employing a magnetic disc capable of having defined thereon a multiplicity of tracks per inch in the disc radial direction, the disc and head having radial and tangential lines of reference relative to each other, the head comprising: a slider having (a) a magnetic high density read/write core gap and a magnetic low density read/write core gap offset relative to each other radially and tangentially on the slider; (b) and a non-magnetic spacer positioned between the magnetic high density core gap and magnetic low density core gap on the slider.
Claim 2
Dependent Claim 115 words
A magnetic read/write head for a disc drive capable of both high density and low density read/write operation as measured in tracks per inch and employing a magnetic disc capable of having defined thereon a multiplicity of tracks per inch in the disc radial direction, the disc and head having radial and tangential lines of reference relative to each other, the head comprising: a slider having (a) a magnetic high density read/write core gap and a magnetic low density read/write core gap offset relative to each other radially and tangentially on the slider; (b) and a non-magnetic spacer positioned between the magnetic high density core gap and magnetic low density core gap on the slider.
Claim 3
Dependent Claim 63 words
The head of claim 1, further comprising: a second slider having (a) a magnetic high density read/write core gap and a magnetic low density read/write core gap offset relative to each other radially and tangentially on the second slider; and (b) a non-magnetic spacer positioned between the magnetic high density core gap and the magnetic low density core gap on the second slider.
Claim 4
Dependent Claim 64 words
The head of claim 2, wherein the disc is positionable between the first and second sliders for read/write operations of the disc drive and wherein the high density core gap of the first slider is located opposite the non-magnetic spacer of the second slider, and the low density core gap of the first slider is located opposite the non-magnetic spacer of the second slider.
Claim 5
Dependent Claim 69 words
The head of claim 3, wherein the low density core gaps of the first and second sliders are substantially aligned along a common radial line of the disc and the high density core gaps of the first and second sliders are aligned but offset from the same side of the radial line of the disc along which the low density gaps of the first and second sliders are aligned.
Claim 6
Dependent Claim 24 words
The head of claim 3, wherein the low density core gaps of the first and second sliders are aligned along a common radial line.
Claim 7
Dependent Claim 46 words
The head of claim 5, wherein the high density core gaps of the first and second sliders are aligned along a line skewed a predetermined distance from the common radial line along which the low density core gaps of the first and second sliders are positioned.
Claim 8
Dependent Claim 42 words
The head of claim 6, wherein the low density core gap of the first slider faces the non-magnetic spacer of the second slider and wherein the low density core gap of the second slider faces the non-magnetic spacer of the first slider.
Claim 9
Dependent Claim 30 words
The head of claim 6, wherein the common radial line of the low density core gaps of the first second sliders are aligned along a radial line of the disc.
Claim 10
Dependent Claim 71 words
The head of claim 6, wherein the high density core gaps of the first and second sliders are disposed to the same side of the low density core gaps of the first and second sliders, with the high density core gap of the first slider facing the non-magnetic spacer of the second slider and the high density core gap of the second slider facing the non-magnetic spacer of the first slider.
Claim 11
Dependent Claim 42 words
The head of claim 5, wherein the low density core gap of the first slider faces the non-magnetic spacer of the second slider and wherein the low density core gap of the second slider faces the non-magnetic material of the first slider.
Claim 12
Dependent Claim 31 words
The head of claim 5, wherein the common radial line of the low density core gaps of the first and second sliders are aligned along a radial line of the disc.
Claim 13
Dependent Claim 70 words
The head of claim 5, wherein the high density core gaps of the first and second sliders are disposed to the same of the low density core gaps of the first and second sliders, with the high density core gap of the first slider facing the non-magnetic spacer of the second slider and the high density core gap of the second slider facing the non-magnetic spacer of the first slider.
Claim 14
Dependent Claim 66 words
The head of claim 2, wherein the low density core gaps of the first and second sliders are substantially aligned along a common radial line of the disc and the high density core gaps of the first and second sliders are aligned but offset from the same side of the radial line along which the low density gaps of the first and second sliders are aligned.
Claim 15
Dependent Claim 41 words
The head of claim 13, wherein the low density and high density core gaps of each of the first sliders are aligned in relationship to a known azimuth of the high density core gap relative to the low density core gap.
Claim 16
Dependent Claim 25 words
The head of claim 2, wherein the widths of the high density core gaps are smaller than the widths of the low density core gaps.
Claim 17
Dependent Claim 46 words
The head of claim 15, wherein the high density core gaps of the first and second sliders are aligned along a line skewed a predetermined distance from the common radial line along which the low density core gaps of the first and second sliders are positioned.

References Cited (Backward Citations)

US4159493A Cited
US4334252A Cited
US4414596A Cited
US4622614A Cited
JPS6038715A Cited
US4805051A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-06-11 1993-12-11 1994-06-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-06-11 1997-12-11 1998-06-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-06-11 2001-12-11 2002-06-12 $7700.00 Window Closed / Lapsed

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