Low friction tape head

• US 9,653,109 B2
• Filed: 03/11/2016
• Issued: 05/16/2017
• Est. Priority Date: 07/06/2010
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Biskeborn, Robert G., Liang, Jason
• Primary Examiner(s): Renner, Craig A.
• Application Number:
  US15/068,403
• Publication Number:
  US 20160196850A1
• Time in Patent Office: 431 Days
• Field of Search: None
• CPC Class Codes: G11B 15/18 Driving; Starting; Stopping; Arrangements for control or regulation thereof G11B15/56 takes precedence
• CPC Class Codes: G11B 15/60 Guiding record carrier guiding devices structurally associated with magazines or cassettes G11B23/04
• CPC Class Codes: G11B 15/62 Maintaining desired spacing between record carrier and head
• CPC Class Codes: G11B 5/00813 magnetic tapes
• 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 5/1871 Shaping or contouring of the transducing or guiding surface
• CPC Class Codes: G11B 5/255 comprising means for protection against wear in thin film structures G11B5/3106
• 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
• CPC Class Codes: G11B 5/29 Structure or manufacture of unitary devices formed of plural heads for more than one track G11B5/33, G11B5/49 and subgroups take precedence; in thin film structure G11B5/31
• 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
• CPC Class Codes: G11B 5/584 for track following on tapes
• CPC Class Codes: G11B 5/60 Fluid-dynamic spacing of heads from record-carriers

Abstract

A drive-implemented method according to one embodiment includes guiding a magnetic medium over a magnetic head at an angle at which the magnetic medium flies over a leading outer portion of the head, engages a leading edge of a tape bearing surface of a central portion of the head, and engages an inner edge of a tape bearing surface of a trailing outer portion of the head. The inner edge of the tape bearing surface of the trailing outer portions skives air from the magnetic medium when the magnetic medium travels in a direction from the central portion towards the trailing outer portion.

Claims

1. A method for setting a wrap angle, comprising:

adjusting a guide position to overwrap a magnetic tape over an outer edge of a leading outer portion of a magnetic head having the leading outer portion, a trailing outer portion, and a central portion positioned between the outer portions, each portion having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers;

causing the magnetic tape to pass over the head, the tape traveling in a direction from the leading outer portion toward the trailing outer portion;

causing reading of the magnetic tape using the leading outer portion;

adjusting a wrap angle of the magnetic tape relative to the leading outer portion until the tape is no longer readable;

determining a position of the guide when the tape becomes no longer readable;

selecting a wrap angle based on the determined position of the guide; and

setting the guide to provide the selected wrap angle.

2. The method as recited in claim 1, wherein the selected wrap angle is greater than a wrap angle provided by the guide when the tape becomes no longer readable.

3. The method as recited in claim 1, wherein outer edges of the tape bearing surfaces of the outer portions are non-skiving.

4. The method as recited in claim 1, wherein outer edges of the tape bearing surfaces of the outer portions are beveled.

5. The method as recited in claim 1, wherein at least one of the portions has patterning for at least one of inducing the magnetic tape to fly thereover in an area away from the transducers and reducing stiction of the tape to the tape bearing surface of the at least one portion.

6. The method as recited in claim 5, wherein the patterning has physical characteristics of being lapped by tape lapping.

7. The method as recited in claim 1, wherein the magnetic tape contacts the tape bearing surface of the central portion and only an inner edge of each of the tape bearing surfaces of the outer portions when the magnetic tape is not in motion and is extended across the head when the guide is set to provide the selected wrap angle.

8. The method as recited in claim 1, wherein the central portion includes an array of writers, wherein the outer portions each have an array of readers.

9. The method as recited in claim 1, wherein the tape bearing surface of the central portion is planar.

10. The method as recited in claim 1, wherein, when the guide is set to provide the selected wrap angle, an angle is formed between the tape bearing surface of each of the outer portions such that the distance between the tape and the respective tape bearing surface increases from a skiving edge to an outer edge of the respective tape bearing surface when the tape is at rest and in tension.

11. A drive-implemented method, comprising:

guiding a magnetic medium over a magnetic head at an angle at which the magnetic medium flies over a leading outer portion of the head, engages a leading edge of a tape bearing surface of a central portion of the head, and engages an inner edge of a tape bearing surface of a trailing outer portion of the head,

wherein the inner edge of the tape bearing surface of the trailing outer portion skives air from the magnetic medium when the magnetic medium travels in a direction from the central portion toward the trailing outer portion,

wherein the magnetic medium contacts a tape bearing surface of the central portion and only the inner edge of the tape bearing surface of the trailing portion and an inner edge of a tape bearing surface of the leading outer portion when the magnetic medium is not in motion and is extended across the head.

12. The method as recited in claim 11, wherein outer edges of the tape bearing surfaces of the outer portions are non-skiving.

13. The method as recited in claim 11, wherein outer edges of the tape bearing surfaces of the outer portions are beveled.

14. The method as recited in claim 11, wherein an array of transducers of the central portion includes a plurality of writers and at least one servo reader calibrated to the position of one or more of the writers of the central portion.

15. The method as recited in claim 11, wherein at least one of the portions has patterning for at least one of inducing the magnetic medium to fly thereover in an area away from transducers thereof and reducing stiction of the medium to the tape bearing surface of the at least one portion.

16. The method as recited in claim 11, wherein the central portion includes an array of writers, wherein the outer portions each have an array of readers.

17. The method as recited in claim 11, wherein the tape bearing surface of the central portion is planar.

18. The method as recited in claim 11, wherein an angle is formed between the magnetic medium and the tape bearing surface of each of the outer portions such that the distance between the magnetic medium and the respective tape bearing surface increases from skiving edges thereof to an outer edge of the respective tape bearing surface when the magnetic medium is at rest and in tension.

19. The method as recited in claim 11,

wherein each outer portion has an array of transducers selected from a group consisting of readers and writers;

wherein the central portion has a planar tape bearing surface and an array of transducers selected from a group consisting of readers and writers;

wherein the tape bearing surface of each outer portion has a tape-engaging section configured and arranged relative to the tape bearing surface of the central portion to at least sometimes have contact with the magnetic medium passing thereover during normal use,

wherein an inner edge of each tape bearing surface of the outer portion is physically oriented with respect to the tape bearing surface of the central portion to skive air from the magnetic medium when the magnetic medium travels in a direction from the central portion toward the respective outer portion, and

wherein an angle is formed between the magnetic medium and the tape bearing surface of each outer portion such that the distance between the magnetic medium and the respective tape bearing surface increases from the inner edge to an outer edge of the tape bearing surface of the respective outer portion when the magnetic medium is at rest and in tension.