US5132861A — Systems using superimposed, orthogonal buried ser…

Claim 1

Independent Claim 196 words

A magnetic head having multiple flux gaps in combination with magnetic recording media on a substrate, there being side-by-side contiguous parallel data tracks at a first level in the media, and there being parallel servo information containing bands at a second level in the media underlying the first level, said data tracks and bands extending in a lengthwise media travel direction, there also being: a) servo transitions spaced along said bands to define liens extending at first azimuth angles, pairs of said liens extending azimuthally convergently, and b) data transitions spaced lengthwise along said data tracks and extending at second azimuth angles which are different from said first azimuth angles, the head having: c) first servo flux gaps which are relatively long to span at least two of said bands, and azimuthally corresponding to said servo transitions, d) a sequence of data read/write flux gaps which are relatively short and have lengths greater than the widths of said tracks, and which are spaced lengthwise of said first flux gaps, and which azimuthally correspond to said data transitions, e) whereby the head can perform read after write on two adjacent data tracks simultaneously, in both media directions.

Claim 2

Dependent Claim 196 words

A magnetic head having multiple flux gaps in combination with magnetic recording media on a substrate, there being side-by-side contiguous parallel data tracks at a first level in the media, and there being parallel servo information containing bands at a second level in the media underlying the first level, said data tracks and bands extending in a lengthwise media travel direction, there also being: a) servo transitions spaced along said bands to define liens extending at first azimuth angles, pairs of said liens extending azimuthally convergently, and b) data transitions spaced lengthwise along said data tracks and extending at second azimuth angles which are different from said first azimuth angles, the head having: c) first servo flux gaps which are relatively long to span at least two of said bands, and azimuthally corresponding to said servo transitions, d) a sequence of data read/write flux gaps which are relatively short and have lengths greater than the widths of said tracks, and which are spaced lengthwise of said first flux gaps, and which azimuthally correspond to said data transitions, e) whereby the head can perform read after write on two adjacent data tracks simultaneously, in both media directions.

Claim 3

Dependent Claim 51 words

The head of claim 1 wherein two of said data flux gaps and one of the first gaps extend at angle α relative to the lengthwise direction, and two of the data flux gaps and another of the first gaps extend at angle β relative to said lengthwise direction, where α=-β.

Claim 4

Dependent Claim 53 words

The head of claim 1 wherein each of said first gaps is a servo read flux gap, one extending at at first angle relative to said lengthwise direction, and the other extending at a second angle relative to said lengthwise direction, where the first angle is equal and opposite to the second angle.

Claim 5

Dependent Claim 72 words

The head of claim 1 wherein one of said first gaps is a trailing servo flux gap to read servo information and connected with a servo drive for the head, and the other of said first gaps is a leading servo flux gap to read servo information, said one gap extending at angle α relative to said lengthwise direction, and the other extending at angle β relative to said direction, where α=-β.

Claim 6

Dependent Claim 39 words

The head of claim 1 wherein a first two of said data flux gaps extends at an obtuse angle Δ relative to said lengthwise direction, and a second two of said data flux gaps extend normal to said direction.

Claim 7

Dependent Claim 38 words

The head of claim 5 wherein aid second two data flux gaps are spaced longitudinally along said direction, and said first two data flux gaps are spaced between said second two flux gaps, and offset laterally relative thereto.

Claim 8

Dependent Claim 9 words

The head of claim 6 wherein said angle Δ=135°.

Claim 9

Dependent Claim 45 words

The head of claim 6 where the projected length of each of said second two flux gaps is wider than but less than twice the data track width, to ensure that the full width of the data track is read without interference from adjacent tracks.

Claim 10

Dependent Claim 55 words

The head of claim 8 where the length of each of said first two data flux gaps when projected onto a line normal to said lengthwise direction is wider than but less than twice the data track and to ensure that the full width of the data track is read without interference from adjacent tracks.

Claim 11

Dependent Claim 104 words

The head of claim 6 wherein there are four parallel side-by-side data tracks subtended by said data flux gaps, and arranged as follows: i) the first, second and third data tracks are subtended by each of said first two data flux gaps, ii) the second, third and fourth data tracks are subtended by each of said second two flux gaps, iii) the second data track is completely bridged by the first two flux gaps, iv) the third data track is completely bridged by the second two flux gaps, whereby the head can read the entirety of each data track without interference from adjacent tracks.

Claim 12

Dependent Claim 39 words

The head of claim 10 wherein data transitions on the first and third tracks extend normal to the length direction of the tracks, and the data transitions on the second and fourth tracks extend at aid azimuth angle Δ.

Claim 13

Dependent Claim 45 words

The head of claim 10 wherein: x 1 ) the first and second tracks extend directly adjacent one another, x 2 ) the second and third tracks extend directly adjacent one another, x 3 ) the third and fourth tracks extend directly adjacent one another.

Claim 14

Dependent Claim 70 words

The head of claim 6 wherein there are two parallel data tracks separated by a narrow guardband, and further arranged as follows: i) the data transitions on both tracks are normal to the track length, and spaced therealong, ii) both data tracks may be subtended by the first two data flux gaps, iii) only the second data track is completely subtended laterally by each of the second two flux gaps.

Claim 15

Dependent Claim 27 words

The head of claim 1 wherein there are at least two of said first flux gaps which are laterally spaced apart and which extend in convergent relation.

Claim 16

Dependent Claim 36 words

The head of claim 1 wherein there are two pairs of said first flux gaps, the pairs longitudinally spaced apart, the first flux gaps of each pair being laterally spaced apart and extending in convergent relation.

Claim 17

Dependent Claim 143 words

A magnetic head having four data read-write flux gaps for reading data transitions on parallel media tracks, said gaps spaced apart in a lengthwise media travel direction, said gaps having lengths greater than the width of said tracks, and wherein a first two of said data flux gaps extend at an obtuse angle Δ relative to said direction, and a second two of said data flux gaps extend normal to said direction, said second two flux gaps being spaced along said direction, and said first two flux gaps spaced between said second two flux gaps, and offset laterally relative thereto, whereby the head can perform read after write on two adjacent side-by-side contiguous data tracks simultaneously, in both media lengthwise directions, and including servo flux gap means associated with the head for controlling lateral positioning of the head relative to said media tracks.

Claim 18

Dependent Claim 143 words

A magnetic head having four data read-write flux gaps for reading data transitions on parallel media tracks, said gaps spaced apart in a lengthwise media travel direction, said gaps having lengths greater than the width of said tracks, and wherein a first two of said data flux gaps extend at an obtuse angle Δ relative to said direction, and a second two of said data flux gaps extend normal to said direction, said second two flux gaps being spaced along said direction, and said first two flux gaps spaced between said second two flux gaps, and offset laterally relative thereto, whereby the head can perform read after write on two adjacent side-by-side contiguous data tracks simultaneously, in both media lengthwise directions, and including servo flux gap means associated with the head for controlling lateral positioning of the head relative to said media tracks.

Claim 19

Dependent Claim 113 words

The head of claim 16 including said parallel tracks in combination therewith, and wherein there are four of said parallel data tracks subtended by said data flux gaps, and arranged as follows: i) the first, second and third data tracks are subtended by each of said first two data flux gaps, ii) the second, third and fourth data tracks are subtended by each of said second two flux gaps, iii) the second data track is completely bridged by the first two flux gaps, iv) the third data track is completely bridged by the second two flux gaps, whereby the head can read the entirety of each data track without interference from adjacent tracks.

Claim 20

Dependent Claim 134 words

A magnetic head having multiple flux gaps in combination with magnetic recording media on a substrate, there being parallel, lengthwise extending data tracks at a first level in the media, and there being parallel servo information containing bands at a second level in the media underlying the first level, the head comprising: a) a sequence of flux gaps which are spaced apart lengthwise of said data tracks, said gaps having lengths which are greater than the width of said data tracks, said flux gaps extending at azimuthally different angles relative to said length direction, b) said flux gaps including at least one of the following: i) two read flux gaps, and ii) two write flux gaps, c) whereby the head can perform read after write on two adjacent tracks simultaneously, in both media directions.

Claim 21

Dependent Claim 134 words

A magnetic head having multiple flux gaps in combination with magnetic recording media on a substrate, there being parallel, lengthwise extending data tracks at a first level in the media, and there being parallel servo information containing bands at a second level in the media underlying the first level, the head comprising: a) a sequence of flux gaps which are spaced apart lengthwise of said data tracks, said gaps having lengths which are greater than the width of said data tracks, said flux gaps extending at azimuthally different angles relative to said length direction, b) said flux gaps including at least one of the following: i) two read flux gaps, and ii) two write flux gaps, c) whereby the head can perform read after write on two adjacent tracks simultaneously, in both media directions.

Claim 22

Dependent Claim 42 words

The combination of claim 18 wherein two of said data flux gaps extend at angle α relative to said length direction, and two more of the data flux gaps extend at angle Δ relative to said length direction, where α equals 90°.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-07-21	1996-01-20	1996-07-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-07-21	2000-01-20	2000-07-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-07-21	2004-01-20	2004-07-21	$7700.00	Window Closed / Lapsed

Systems using superimposed, orthogonal buried servo signals

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