Magnetic tape head contour with land widths to optimize flying height and a sufficient number of bleed slots to uniformly maintain the flying height of the tape

• US 5,751,527 A
• Filed: 08/15/1994
• Issued: 05/12/1998
• Est. Priority Date: 02/10/1993
• Status: Expired due to Term

• Current Assignee: Storage Technologies Corporation (Oracle Corporation)
• Original Assignee: Storage Technologies Corporation (Oracle Corporation)
• Inventors: Sundaram, Ramesh, Barber, Terry J.
• Primary Examiner(s): Levy, Stuart S.
• Assistant Examiner(s): Korzuch, William R.
• Application Number:
  US08/291,052
• Time in Patent Office: 1,366 Days
• Field of Search: 360/122, 360/102, 360/103, 360/121, 360/125
• US Class Current: 360/122
• CPC Class Codes: G11B 15/62 Maintaining desired spacing between record carrier and head
• CPC Class Codes: G11B 5/102 Manufacture of housing
• CPC Class Codes: G11B 5/1871 Shaping or contouring of the transducing or guiding surface
• CPC Class Codes: G11B 5/265 Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track G11B5/33 takes precedence in thin film structures G11B5/31

Abstract

An improved magnetic tape head contour for reading from and writing to magnetic tape moving across the tape head has a unique configuration of bleed slots such that land width is limited to a width that optimizes flying height at increased tape speeds on the order of 4 meters/second. The number of bleed slots is increased to minimize tape undulations thereby minimizing tape head wear profile undulations. A single gutter slot is optionally provided at each end of the tape head to reduce end element wear and increase the useful life of the heads.

Claims

1. A magnetic tape head having a plurality of magnetic elements and a contour for maintaining an optimum and uniform flying height of a magnetic tape moving across a length of a gap of the magnetic tape head, the contour comprising:

a plurality of bleed slots formed in the contour;

a plurality of lands interspersed between said bleed slots, said bleed slots being formed such that said lands are each of a width from 0.0040 to 0.0065 inches to optimize the flying height of the magnetic tape moving across the length of the gap of the magnetic tape head at speeds greater than 2 meters/second, said bleed slots being sufficiently great in number to uniformly maintain the flying height across the tape so that the plurality of magnetic elements are positioned in the gap independently of the position of said lands and said bleed slots.

2. The magnetic tape head contour of claim 1, wherein said lands are 0.0055 inches wide.

3. The magnetic tape head contour of claim 1, wherein the tape head contour comprises thirty (30) bleed slots.

4. The magnetic tape head contour of claim 1, further comprising a single gutter slot at each end of the head contour configured to provide additional material between said single gutter slot and its adjacent end element such that end-element wear is reduced and useful tape head life is extended.

5. The magnetic tape head contour of claim 4, wherein a width of an end land formed between one of said gutter slots and an end bleed slot is manufactured to a looser tolerance than are said lands.

6. The magnetic tape head contour of claim 4, wherein an end land formed between one of said gutter slots and an end bleed slot is 0.0045 to 0.0063 inches wide.

7. A magnetic tape head for at least one of reading from and writing to a magnetic tape moving across the tape head at increased speeds while maintaining an optimum and uniform head-to-tape separation, the tape head having first and second read/write modules, wherein said first and second modules each comprise:

a plurality of magnetic elements;

a contour having

a gap wherein said plurality of magnetic elements are disposed,

a plurality of bleed slots formed in said contour, and

a plurality of lands interspersed between said bleed slots,

wherein said bleed slots are formed such that said lands are of a width from 0.0040 to 0.0065 inches to optimize the head-to-tape separation over said gap at a tape speed greater than 2 meters/second, and

wherein the number of said bleed slots is sufficiently great to uniformly maintain the head-to-tape separation across the magnetic tape so that said plurality of magnetic elements are disposed in said gap independently of the position of said lands and said bleed slots; and

a gutter slot formed on each end of said contour.

8. The magnetic tape head of claim 7, wherein said bleed slots are formed in parallel to the direction of motion of the magnetic tape.

9. The magnetic tape head of claim 7, wherein said contour comprises thirty (30) bleed slots.

10. The magnetic tape head of claim 7, wherein said gutter slot is formed such that material between said gutter slot and an adjacent end element is of sufficient width to reduce end element wear and to enhance useful head life.

11. The magnetic tape head of claim 7, wherein said bleed slots are provided on each edge of said first and second read/write modules.

12. The magnetic tape head of claim 7, wherein said bleed slots are provided on each edge of said first read/write module and on only one edge of said second read/write module.

13. The magnetic tape head of claim 7, wherein said bleed slots are provided on only one edge of said first read/write module and on only one edge of said second read/write module.

14. A magnetic tape head comprising:

a plurality of magnetic elements; and

a tape head contour having

a longitudinal gap formed in said contour, and

a plurality of bleed slots formed in said contour, said bleeds slots formed such that a land between two longitudinally adjacent bleed slots is of a sufficient width to provide an optimum head-to-tape separation of a magnetic tape over said gap, said bleed slots being of a sufficient number that the head-to-tape separation of said magnetic tape moving across said gap is uniform across said magnetic tape, said plurality of magnetic elements positioned along said gap independently of the position of said bleed slots and said lands.

15. A method for manufacturing a magnetic tape head having a tape head contour and a plurality of magnetic elements, the contour having a longitudinal gap, the method comprising the steps of:

1) forming a plurality of bleed slots in the tape head contour such that

a) a land between two longitudinally adjacent bleed slots is of a sufficient width to optimize the head-to-tape separation of a magnetic tape moving across the gap, and

b) said bleed slots are of a sufficient number that the head-to-tape separation of the magnetic tape is uniformly maintained across the magnetic tape; and

2) positioning the plurality of magnetic elements along the gap at points independent from the position of said bleed slots and said lands.

16. A magnetic tape head for maintaining an optimum and uniform flying height of a magnetic tape moving across a length of a gap of the magnetic tape head, comprising:

a longitudinal gap;

a plurality of lands interspersed between a plurality of bleed slots formed in the magnetic tape head such that said lands are of a width to optimize the flying height of the magnetic tape moving across the length of said gap at speeds greater than 2 meters/second, wherein a number of said bleed slots is sufficiently great to uniformly maintain the flying height across the magnetic tape; and

a plurality of magnetic elements positioned in said gap independently from the position of said lands and said bleed slots.

17. A tape head comprising:

a longitudinal gap;

a plurality of lands interspersed between a plurality or bleed slots formed in the tape head such that said lands are of a width to optimize a head-to-tape separation of a tape moving across a length of said gap of the tape head at speeds greater than 2 meters/second; and

a plurality of magnetic elements disposed in said longitudinal gap independently of said lands and said bleed slots,

wherein a number of said bleed slots is sufficiently great to minimize an undulating wear profile of the tape head.

18. A method for manufacturing a magnetic tape head having a tape head contour and a plurality of magnetic elements, the contour having a longitudinal gap, the method comprising the steps of:

1) forming a plurality of bleed slots in the tape head contour such that

a) a land between two longitudinally adjacent bleed slots is of a sufficient width to optimize the head-to-tape separation of a magnetic tape moving across the gap, and

b) said bleed slots are of a sufficient number to minimize an undulating wear profile of the tape head contour; and

2) positioning the plurality of magnetic elements along the gap at points independent from the position of said bleed slots and said lands.

19. A magnetic tape head comprising:

a tape head contour having

a longitudinal gap, and

a plurality of lands interspersed between a plurality of bleed slots formed in said contour; and

a plurality of magnetic elements positioned in said gap independently from said bleed slots and said lands,

wherein said bleeds slots are formed such that a land between two longitudinally adjacent bleed slots is of a sufficient width to provide an optimum head-to-tape separation of a magnetic tape over said gap, and

wherein said bleed slots are of a sufficient number to minimize an undulating wear profile of said tape head contour.