TAPE HEAD HAVING SENSORS PROXIMATE TO AN EDGE

• US 20190206430A1
• Filed: 03/08/2019
• Published: 07/04/2019
• Est. Priority Date: 10/31/2016
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Biskeborn, Robert G.
• Granted Patent: US 10,726,866 B2
• Time in Patent Office: Days
• CPC Class Codes: G11B 15/43 Control or regulation of mechanical tension of record carrier, e.g. tape tension
• CPC Class Codes: G11B 15/60 Guiding record carrier guiding devices structurally associated with magazines or cassettes G11B23/04
• CPC Class Codes: G11B 15/605 without displacing the guiding means
• CPC Class Codes: G11B 15/62 Maintaining desired spacing between record carrier and head
• CPC Class Codes: G11B 5/008 Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires G11B15/00 G11B19/00 take precedence; bulk transferring of information magnetisation for re-recording G11B5/865; marking record carriers in digital fashion G06K
• CPC Class Codes: G11B 5/00813 magnetic tapes
• 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 5/31 using thin films G11B5/1274, G11B5/1278, G11B5/1874, G11B5/1875, G11B5/33, G11B5/49 take precedence; magnetic thin film structures H01F10/00
• CPC Class Codes: G11B 5/3906 Details related to the use of magnetic thin film layers or to their effects
• CPC Class Codes: G11B 5/40 Protective measures on heads, e.g. against excessive temperature G11B5/31 takes precedence; protection against wear G11B5/255 ; protective structure of the head: see under structures, e.g. G11B5/3106
• CPC Class Codes: G11B 5/48 Disposition or mounting of heads or head supports relative to record carriers mounting of head within housing G11B5/105; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed driving of both record carriers and head G11B15/18; guiding record carriers G11B15/60; head selecting circuits G11B15/12
• CPC Class Codes: G11B 5/4893 relative to moving tape
• CPC Class Codes: G11B 5/581 maintaining desired contact or spacing by direct interaction of forces generated between heads or supports thereof and record carriers or supports thereof, e.g. attraction-repulsion interactions

Abstract

According to one embodiment, a method includes running a magnetic recording tape over an edge of a tape bearing surface of a module, where the edge is proximate to a sensor of the module, detecting magnetic fields from the magnetic recording tape at different wrap angles, and selecting one of the wrap angles of the magnetic recording tape to provide about a predefined height of tenting of the magnetic recording tape above the sensor.

Claims

1. A method, comprising:

running a magnetic recording tape over an edge of a tape bearing surface of a module, wherein the edge is proximate to a sensor of the module;

detecting magnetic fields from the magnetic recording tape at different wrap angles; and

selecting one of the wrap angles of the magnetic recording tape to provide about a predefined height of tenting of the magnetic recording tape above the sensor.

2. A method as recited in claim 1, comprising positioning a guide to set the selected one of the wrap angles.

3. A method as recited in claim 1, comprising positioning a second module to set the selected one of the wrap angles.

4. A method as recited in claim 1, wherein the detected magnetic field are used to determine an extent of spacing, wherein the extent of spacing is representative of a height of tenting.

5. A method as recited in claim 1, wherein the one of the wrap angles of the magnetic recording tape is selected based on a tenting characteristic that changes with changing wrap angle.

6. A method as recited in claim 1, wherein the predefined height of tenting of the magnetic recording tape above the sensor is a peak height of tenting, wherein the peak height is in a range from about 16 to about 26 nanometers from a media facing surface of a tape support surface.

7. A method as recited in claim 6, wherein the peak height is measured from a plane of the media facing surface of the sensor.

8. A method as recited in claim 6, wherein the peak height is measured from the media facing surface of the sensor that is recessed from a plane of the tape support surface.

9. A method as recited in claim 6, wherein the peak height is measured from the media facing surface of a coating on the media facing surface of the sensor that is recessed from a plane of the media facing surface of the tape support surface of the sensor.

10. A computer-implemented method, comprising:

receiving a measurement of a distance from an edge of a tape bearing surface of a module to a sensor located along the tape bearing surface of the module;

receiving a predefined height of tenting of a magnetic recording tape above the sensor; and

calculating a wrap angle of the magnetic recording tape to achieve the predefined height of tenting when the magnetic recording tape passes over the edge.

11. A computer-implemented method as recited in claim 10, comprising positioning a guide to set the calculated wrap angle of the magnetic recording tape.

12. A computer-implemented method as recited in claim 10, comprising positioning a second module to set the calculated wrap angle of the magnetic recording tape.

13. A computer-implemented method as recited in claim 10, wherein the module is adjusted in a vertical direction to create the calculated wrap angle when the magnetic recording tape moves over the module.

14. A computer-implemented method as recited in claim 10, wherein the distance is measured optically.

15. A computer-implemented method as recited in claim 10, wherein the predefined height of tenting of the magnetic recording tape above the sensor is a peak height of tenting, wherein the peak height is in a range from about 16 to about 26 nanometers from a media facing surface of a tape support surface.

16. A computer-implemented method as recited in claim 15, wherein the peak height is measured from a plane of the media facing surface of the sensor.

17. A computer-implemented method as recited in claim 15, wherein the peak height is measured from the media facing surface of the sensor that is recessed from a plane of the tape support surface.

18. A computer-implemented method as recited in claim 15, wherein the peak height is measured from the media facing surface of a coating on the media facing surface of the sensor that is recessed from a plane of the media facing surface of the tape support surface of the sensor.

19. A computer program product for determining a wrap angle to induce a desired tenting, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to:

receive, by the processor, a measurement of a distance from an edge of a tape bearing surface of a module to a sensor located along the tape bearing surface of the module;

receive, by the processor, a predefined height of tenting of a magnetic recording tape above the sensor; and

calculate, by the processor, a wrap angle of the magnetic recording tape to achieve the predefined height of tenting when the magnetic recording tape passes over the edge.

20. A computer program product as recited in claim 19, comprising,

position, by a processor, a guide to set the calculated wrap angle of the magnetic recording tape.