Magnetic head and system having offset arrays

Patent metadata

Field	Value
Publication number	US-9607639-B2
Application number	US-201514860522-A
Country	US
Kind code	B2
Filing date	Sep 21, 2015
Priority date	May 1, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

In one general embodiment, an apparatus includes at least two modules, each of the modules having an array of transducers, wherein the at least two modules are fixed relative to each other, wherein an axis of each array is defined between opposite ends thereof, wherein the axes of the arrays are oriented about parallel to each other, wherein the array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that the transducers of the first module are about aligned with the transducers of the second module in an intended direction of tape travel thereacross; and a mechanism for orienting the modules about an axis orthogonal to the plane in which the arrays reside to control a transducer pitch presented to a tape.

First claim

What is claimed is:

1. An apparatus, comprising:
at least two modules, each of the modules having an array of transducers,
wherein the at least two modules are fixed relative to each other,
wherein an axis of each array is defined between opposite ends thereof,
wherein the axes of the arrays are oriented about parallel to each other,
wherein the array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that 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 the axes are oriented at an angle greater than 0.2° relative to a line oriented perpendicular to the intended direction of tape travel thereacross; and
a mechanism for orienting the modules to control a transducer pitch presented to a tape; and
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.

2. An apparatus, comprising:
at least two modules, each of the modules having an array of transducers,
wherein the at least two modules are fixed relative to each other,
wherein an axis of each array is defined between opposite ends thereof,
wherein the axes of the arrays are oriented about parallel to each other,
wherein the array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that 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 the axes 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 for orienting the modules to control a transducer pitch presented to a tape;
a controller physically configured to determine a characteristic of the tape based on a readback signal from the tape,
the controller being physically configured to control the mechanism for orienting the modules based on the characteristic of the tape; and
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.

3. An apparatus as recited in claim 2 , comprising a spacer member extending between tape bearing surfaces of an adjacent pair of the at least two 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.

4. An apparatus as recited in claim 1 , wherein the characteristic is selected from a group consisting of a state of expansion of the tape and a skew of the tape.

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

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

7. An apparatus as recited in claim 1 , wherein the characteristic is a skew of the tape.

8. An apparatus as recited in claim 1 , wherein the characteristic is a state of expansion of the tape.

9. 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 first orienting mechanism for orienting the modules to control a transducer pitch presented to a tape; and
a controller electrically coupled to the first orienting mechanism, the controller configured to control the first orienting mechanism for orienting the modules based on a state of expansion of the tape,
wherein the at least two modules are fixed relative to each other,
wherein an axis of each array is defined between opposite ends thereof,
wherein the axes of the arrays are oriented about parallel to each other,
wherein the axes are oriented at an angle greater than 0.2° relative to a line oriented perpendicular to an intended direction of tape travel thereacross,
wherein the array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that the transducers of the first module are about aligned with the transducers of the second module in the intended direction of tape travel thereacross; and
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 orienting mechanism for orienting the second modules to control a transducer pitch presented to a tape.

10. An apparatus as recited in claim 9 , wherein the angle greater than 0.2° relative to a line oriented perpendicular to the intended direction of tape travel thereacross is a nominal angle, wherein a readback signal is derived from the transducers of the modules of the arrays when the axes of the arrays are oriented at the nominal angle, the controller being physically configured to control the first orienting mechanism for altering the angle of the modules away from the nominal angle based on a state of expansion of the tape based on the readback signal.

11. An apparatus as recited in claim 9 , wherein the controller is further physically configured to control the first orienting mechanism for orienting the modules based on a skew of the tape.

12. An apparatus as recited in claim 9 , wherein the angle is between 0.25° and about 5°.

13. An apparatus as recited in claim 9 , wherein closest ends of the modules are offset from one another in the first direction.

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

• G11B5/11

  Shielding of head against electric or magnetic fields · CPC title

• G11B5/00826

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

• G11B5/2652

  with more than one gap simultaneously operative (with controlled single gap G11B5/245) · CPC title

• G11B5/588 Primary

  by controlling the position of the rotating heads (by controlling the speed of the record carrier G11B15/467; by controlling speed of the heads G11B15/473; {by moving the transducing part of the head relative to the headwheel, in the direction of the scanning movement G11B15/1841}) · CPC title