Magnetic head and system having offset arrays

Patent metadata

Field	Value
Publication number	US-9595276-B2
Application number	US-201514924622-A
Country	US
Kind code	B2
Filing date	Oct 27, 2015
Priority date	May 1, 2013
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

In one embodiment, an apparatus includes at least first and second modules, a mechanism for orienting the modules to control a transducer pitch presented to a tape, and a controller physically configured to determine a state of expansion of the tape based on a readback signal from the tape. Each of the modules have an array of transducers. The first and second modules are fixed relative to each other. The transducers of the first module are about aligned with the transducers of the second module in an intended direction of tape travel thereacross when longitudinal axes of the arrays are oriented at an angle greater than 0.2° relative to a line oriented perpendicular to the intended direction of tape travel. The controller is physically configured to control the mechanism for altering the angle of the modules away from the nominal angle based on the state of expansion of the tape.

First claim

What is claimed is:

1. An apparatus, comprising:
at least first and second modules, each of the modules having an array of transducers,
wherein the first and second modules are fixed relative to each other,
wherein the transducers of the first module are about aligned with the transducers of the second module in an intended direction of tape travel thereacross when longitudinal axes of the arrays are oriented at an angle greater than 0.2° relative to a line oriented perpendicular to the intended direction of tape travel thereacross;
a mechanism configured to orient the modules to control a transducer pitch presented to a tape; and
a controller physically configured to determine a state of expansion of the tape based on a readback signal from the tape, the readback signal being derived from the transducers of the modules when the axes of the arrays are oriented at the angle,
the controller being physically configured to control the mechanism for altering the angle of the modules away from a nominal angle based on the state of expansion of the tape.

2. An apparatus as recited in claim 1 , wherein only two modules are present.

3. An apparatus as recited in claim 1 , wherein a third one of the modules is positioned between the first and second modules, wherein the array of the third module is offset from the array of the first module in the intended direction of tape travel, wherein an extent of an offset of the array of the third module relative to the array of the first module is less than an extent of an offset of the array of the second module relative to the array of the first module.

4. An apparatus as recited in claim 3 , wherein the first and second modules are configured for data writing and are not configured for data reading, wherein the third module is configured for data reading and is not configured for data writing.

5. An apparatus as recited in claim 3 , wherein the first and second modules are configured for data reading and are not configured for data writing, wherein the third module is configured for data writing and is not configured for data reading.

6. An apparatus as recited in claim 1 , wherein closest ends of the modules are offset from one another in the intended direction of tape travel.

7. An apparatus as recited in claim 1 , wherein the controller is also configured to control the mechanism configured to orient the modules based on a skew of the tape.

8. An apparatus as recited in claim 1 , comprising a drive mechanism for passing a magnetic medium over the modules.

9. An apparatus as recited in claim 1 , comprising a spacer member extending between tape bearing surfaces of an adjacent pair of the modules, the spacer member including a magnetic shield for magnetically shielding the array of transducers on one of the modules from the array of transducers on the other module.

10. An apparatus as recited in claim 1 , comprising a second set of at least two second modules generally aligned with the at least two modules in the intended direction of tape travel, each of the second modules having an array of transducers, wherein the at least two second modules are fixed relative to each other; and further comprising a second mechanism for orienting the second modules to control a transducer pitch presented to a tape.

11. An apparatus as recited in claim 1 , wherein the nominal angle is between 0.25° and about 5°.

12. An apparatus, comprising:
at least two modules, each of the modules having an array of transducers,
a drive mechanism for passing a magnetic medium over the modules;
a mechanism configured to orient the modules to control a transducer pitch presented to a tape; and
a controller configured to control the mechanism configured to orient the modules based on a state of expansion of the tape,
wherein the at least two modules are fixed relative to each other,
wherein longitudinal axes of the arrays of the modules are oriented about parallel to each other,
wherein the controller is physically configured to cause positioning of the transducers of the parallel arrays of the modules to orient the longitudinal axes of the arrays at an angle greater than 0.2° relative to a line oriented perpendicular to an intended direction of tape travel thereacross during acquisition of a readback signal from the tape, the readback signal being derived from the transducers of the parallel arrays.

13. An apparatus as recited in claim 12 , wherein only two modules are present.

14. An apparatus as recited in claim 12 , wherein a third one of the modules is positioned between first and second ones of the modules, wherein the array of the third module is offset from the array of the first module in the intended direction of tape travel, wherein an extent of an offset of array of the third module relative to the array of the first module is less than an extent of an offset of the array of the second module relative to the array of the first module.

15. An apparatus as recited in claim 14 , wherein the first and second modules are configured for data writing and are not configured for data reading, wherein the third module is configured for data reading and is not configured for data writing.

16. An apparatus as recited in claim 14 , wherein the first and second modules are configured for data reading and are not configured for data writing, wherein the third module is configured for data writing and is not configured for data reading.

17. An apparatus as recited in claim 12 , wherein the controller is further configured to control the mechanism configured to orient the modules based on a skew of the tape.

18. An apparatus as recited in claim 12 , wherein the axes are oriented at an angle between 0.25° and about 5° relative to the line oriented perpendicular to the intended direction of tape travel thereacross.

19. An apparatus as recited in claim 12 , wherein the arrays of the modules are offset from one another in a first direction that is parallel to the axes of the arrays.

Assignees

• IBM

Inventors

• Biskeborn Robert G
• Herget Philipp
• Lo Calvin S

Classifications

• G11B5/56 Primary

  with provision for moving the head {support} for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering ({G11B5/52,} G11B5/54, G11B5/58 take precedence) · CPC title

• G11B5/00826

  comprising a plurality of single poles or gaps or groups thereof operative at the same time · CPC title

• G11B5/584 Primary

  for track following on tapes · CPC title

• G11B5/4893

  relative to moving tape · CPC title

• G11B5/29

  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 title