METHODS FOR SELECTING WRAP ANGLE FOR INDUCING TAPE TENTING ABOVE TRANSDUCER

• US 20190304502A1
• Filed: 06/19/2019
• Published: 10/03/2019
• Est. Priority Date: 12/06/2016
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Biskeborn, Robert G., Czarnecki, W. Stanley, Lo, Calvin S.
• Granted Patent: US 10,832,725 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 15/62 Maintaining desired spacing between record carrier and head
• CPC Class Codes: G11B 15/64 by fluid-dynamic spacing
• CPC Class Codes: G11B 5/00813 magnetic tapes
• 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 5/1871 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 5/4893 relative to moving tape
• CPC Class Codes: G11B 5/60 Fluid-dynamic spacing of heads from record-carriers

Abstract

In one embodiment, a computer program product for determining a wrap angle includes a computer readable storage medium having program instructions embodied therewith, wherein the computer readable storage medium is not a transitory signal per se. The program instructions are executable by a processor to cause the processor to perform a method that includes receiving, by the processor, a measurement of a distance from an edge to a transducer, receiving, by the processor, a predefined height of tenting of a magnetic recording tape above the transducer, and determining, by the processor, a wrap angle for inducing tenting of the magnetic recording tape above the transducer at the predefined height when the magnetic recording tape passes over the edge in a direction of tape travel thereacross.

Claims

1. A method, comprising:

receiving a measurement of a distance from an edge to a transducer;

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

determining a wrap angle for inducing tenting of the magnetic recording tape above the transducer at the predefined height when the magnetic recording tape passes over the edge in a direction of tape travel thereacross.

2. A method as recited in claim 1, comprising positioning a guide to set the determined wrap angle.

3. A method as recited in claim 1, comprising positioning a second module to set the determined wrap angle.

4. A method as recited in claim 1, wherein the distance is measured optically.

5. A method as recited in claim 1, wherein the distance is measured mechanically.

6. A method as recited in claim 1, wherein the predefined height of tenting is in a range of from about 5 to about 30 nanometers from a media facing side of a tape support surface of the transducer.

7. A method as recited in claim 1, comprising moving the magnetic recording tape over the edge for an amount of time sufficient to cause detectable wear on the edge;

and adjusting the wrap angle to produce the predefined height of tenting.

8. A computer program product for determining a wrap angle, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, wherein the computer readable storage medium is not a transitory signal per se, the program instructions executable by a processor to cause the processor to perform a method comprising:

receiving, by the processor, a measurement of a distance from an edge to a transducer;

receiving, by the processor, a predefined height of tenting of a magnetic recording tape above the transducer; and

determining, by the processor, a wrap angle for inducing tenting of the magnetic recording tape above the transducer at the predefined height when the magnetic recording tape passes over the edge in a direction of tape travel thereacross.

9. A computer program product as recited in claim 8, wherein a module of a tape head is set in a vertical direction to create the determined wrap angle of the magnetic recording tape.

10. A computer program product as recited in claim 8, wherein a guide is set to create the determined wrap angle of the magnetic recording tape.

11. A computer program product as recited in claim 8, wherein a second module is set to create the determined wrap angle of the magnetic recording tape.

12. A computer program product as recited in claim 8, comprising program instructions for detecting signals from the tape at differing wrap angles of the tape for estimating a height of tenting of the tape above the transducer;

and selecting a wrap angle to provide about the predefined height of tenting of the magnetic recording tape above the transducer.

13. A computer program product as recited in claim 8, wherein the distance is measured optically.

14. A computer program product as recited in claim 8, wherein the distance is measured mechanically.

15. A computer program product as recited in claim 8, wherein the predefined height of tenting is in a range of from about 5 to about 30 nanometers from a media facing surface of a tape support surface.

16. A computer program product as recited in claim 8 comprising moving, by the processor, the tape over the edge for an amount of time sufficient to cause detectable wear on the edge;

and adjusting the wrap angle to produce the predefined height of tenting.