Tape head surface with non-uniform cross-width profile

• US 8,958,175 B1
• Filed: 01/16/2014
• Issued: 02/17/2015
• Est. Priority Date: 01/16/2014
• Status: Active Grant

• Current Assignee: Oracle International Corporation (Oracle Corporation)
• Original Assignee: Oracle International Corporation (Oracle Corporation)
• Inventors: Lakshmikumaran, Anand V., Torline, Joseph E.
• Primary Examiner(s): BLOUIN, MARK S
• Application Number:
  US14/156,802
• Time in Patent Office: 397 Days
• Field of Search: 360/122
• US Class Current: 360/122
• CPC Class Codes: G11B 5/00826 comprising a plurality of single poles or gaps or groups thereof operative at the same time
• CPC Class Codes: G11B 5/187 Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features G11B5/265, G11B5/29 , G11B5/31 take precedence
• CPC Class Codes: G11B 5/3106 where the integrated or assembled structure comprises means for conditioning against physical detrimental influence, e.g. wear, contamination G11B5/3133 takes precedence

Abstract

A tape head having an upper surface with a non-uniform (e.g. non-planar) cross-width (e.g., perpendicular to tape moving over the tape head) profile for eliminating contact between the tape head and portions of the tape not disposed over read/write elements of the tape head (e.g., near opposite first and second edges of the tape) during reading/writing operations on the tape. The upper surface of the tape head includes at least one “active” zone encompassing the read/write elements and that is configured to contact the tape and at least one “inactive” zone that recesses (e.g., slopes, tapers, drops, rounds, etc.) away from the active zone to avoid contact with tape traveling thereover. Eliminating contact between the tape head and portions of the tape not currently being read and/or written reduces friction between the tape and the tape head and facilitates control of tape head lateral positioning, tape tension, and tape speed.

Claims

1. A tape head module for performing at least one of reading operations and writing operations on a magnetic tape, comprising:

a body; and

an upper surface on the body that is configured to face a magnetic tape traveling at least partially along a first reference axis over the upper surface, wherein the upper surface includes;

a first region including a plurality of at least one of read elements and write elements that are respectively configured to read data from and write data to the magnetic tape as the magnetic tape travels over and at least partially in contact with the first region along a direction of motion that is collinear with or parallel to the first reference axis; and

a second region configured to be free of contact with the magnetic tape as the magnetic tape travels over the second region, wherein a distance between a) a second reference axis perpendicular to the first reference axis and b) the second region increases in a direction away from the first reference axis.

2. The tape head module of claim 1, wherein the second region includes at least one radius of curvature.

3. The tape head module of claim 1, wherein the second region resides in a single plane.

4. The tape head module of claim 3, wherein a slope of the second region is not greater than about 25°

relative to the second reference axis.

5. The tape head module of claim 3, wherein the first region resides in a single plane different from the single plane within which the second region resides.

6. The tape head module of claim 1, wherein the upper surface further includes a third region configured to be free of contact with the magnetic tape as the magnetic tape travels over the third region, wherein a distance between a) the second reference axis and b) the third region increases in a direction away from the first reference axis.

7. The tape head module of claim 6, wherein the distance between a) the second reference axis and b) the second region increases in a first direction away from the first reference axis, wherein the distance between a) the second reference axis and b) the third region increases in a second direction away from the first reference axis, and wherein the first direction away from the first reference axis is opposite to the second direction away from the first reference axis.

8. The tape head module of claim 7, wherein a distance between a) the first reference axis and b) the first region increases in a direction away from the second reference axis.

9. The tape head module of claim 8, wherein the distance between a) the first reference axis and b) the first region increases in a first direction away from the second reference axis, wherein the distance between a) the first reference axis and b) the first region increases in a second direction away from the second reference axis, and wherein the first direction away from the second reference axis is opposite to the second direction away from the second reference axis.

10. The tape head module of claim 9, wherein a distance between a) a third reference axis through the second region and that is parallel to the first reference axis and b) the second region increases in a direction away from the second reference axis, and wherein a distance between a) a fourth reference axis through the third region and that is parallel to the first reference axis and b) the third region increases in a direction away from the second reference axis.

11. The tape head module of claim 10, wherein the distance between a) the third reference axis and b) the second region increases in the first and second directions away from the second reference axis, and wherein the distance between a) the fourth reference axis and b) the third region increases in the first and second directions away from the second reference axis.

12. A tape drive that includes the tape head module of claim 1.

13. A method, comprising:

moving a magnetic tape over the upper surface of the tape head module of claim 1, wherein the magnetic tape includes first and second opposite edges, and wherein at least one of the first and second opposite edges is spaced from the second region.

14. The method of claim 13, wherein at least about 20% of a width of the tape between the first and second edges is spaced from the tape head module during the moving.

15. A tape head module for performing at least one of reading operations and writing operations on a magnetic tape, comprising:

a body; and

an upper surface on the body that includes a plurality of at least one of read elements and write elements that are respectively configured to read data from and write data to a magnetic tape, wherein the upper surface tapers in first and second opposite directions away from the plurality of the at least one of read elements and write elements, wherein the upper surface tapers in third and fourth opposite directions away from the plurality of the at least one of read elements and write elements, and wherein the first and second directions are perpendicular to the third and fourth directions.

16. The tape head module of claim 15, wherein the upper surface includes a radius of curvature in the first and second opposite directions away from the plurality of read and/or write elements.

17. The tape head module of claim 16, wherein the upper surface includes a radius of curvature in the third and fourth opposite directions away from the plurality of read and/or write elements.

18. A method of operating a tape drive, comprising:

moving tape over a tape head of a tape drive so that a) a first portion of the tape is in contact with a plurality of at least one of read elements and write elements of the tape head and b) a second portion of the tape, disposed along a reference line perpendicular to first and second opposite lateral edges of the tape and that passes through the first portion of the tape, is spaced from the tape head.

19. The method of claim 18, wherein the second portion is adjacent the first edge of the tape, wherein a third portion of the tape along the reference line is spaced from the tape head, and wherein the third portion is adjacent the second edge of the tape.

20. The method of claim 18, wherein at least about 20% of a width of the tape between the first and second edges is spaced from the tape head during the moving.