Tape head and system having asymmetrical construction

• US 10,395,674 B2
• Filed: 11/02/2017
• Issued: 08/27/2019
• 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.
• Primary Examiner(s): Klimowicz, William J
• Application Number:
  US15/802,305
• Publication Number:
  US 20180122409A1
• Time in Patent Office: 663 Days
• Field of Search: None
• 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 5/00821 using stationary heads
• 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 5/4893 relative to moving tape

Abstract

According to one embodiment, a method includes determining a first distance from a sensor to a first edge closest thereto, where the sensor is positioned between a lower shield and the first edge, selecting a first wrap angle based on the first distance for inducing tenting of a moving magnetic recording tape in a region above the sensor, determining a second distance from a second edge to the sensor, and selecting a second wrap angle based on the determined second distance for affecting or not affecting the tenting of a moving magnetic recording tape in the region above the sensor.

Claims

1. A method comprising:

determining a first distance from a sensor to a first edge closest thereto, wherein the sensor is positioned between a lower shield and the first edge;

selecting a first wrap angle, set by a first guide, based on the first distance for inducing tenting of a moving magnetic recording tape above a tape bearing surface in a region directly above the sensor, the tenting causing the moving magnetic recording tape to form a tent having a convex region beginning at the first edge and transitioning to a concave region at an inflection point, an end of the tenting being where the concave region transitions to another tent or becomes essentially parallel to the tape bearing surface;

determining a second distance from a second edge to the sensor; and

selecting a second wrap angle, set by a second guide, based on the determined second distance for affecting or not affecting the tenting of a moving magnetic recording tape located directly above the sensor.

2. The method recited in claim 1, wherein the first distance is a stored value, wherein the stored value is retrieved and used in a computation to calculate the first wrap angle.

3. The method recited in claim 1, wherein the first distance is detected and used in a computation to calculate the first wrap angle.

4. The method recited in claim 1, wherein the first distance and/or the second distance is measured mechanically.

5. The method recited in claim 1, wherein the first distance and/or the second distance is measured optically.

6. The method recited in claim 1, wherein the first wrap angle is selected based on one or more tenting characteristics, wherein the tenting characteristics are variable with changing wrap angle.

7. The method as recited in claim 6, wherein the one or more tenting characteristics include a peak height of the tenting formed at the selected first wrap angle.

8. The method as recited in claim 6, wherein the one or more tenting characteristics include a length of a tent formed at the selected first wrap angle.

9. A method comprising:

running a magnetic recording tape over an edge proximate to a sensor of a module;

detecting magnetic fields, using the sensor, from the magnetic recording tape; and

selecting a wrap angle, set by a first guide, to provide about a predefined height of tenting of the magnetic recording tape above the sensor as determined using the detected magnetic fields.

10. The method recited in claim 9, wherein the wrap angle is selected based on one or more tenting characteristics, wherein the tenting characteristics are variable with changing wrap angle.

11. The method as recited in claim 10, wherein the one or more tenting characteristics include a peak height of the tenting formed at the selected wrap angle.

12. The method as recited in claim 10, wherein the one or more tenting characteristics include a length of a tent formed at the selected wrap angle.

13. The method as recited in claim 9, wherein the wrap angle is selected to provide about a predefined height of a convex region of the tenting of the magnetic recording tape above the sensor as determined using the detected magnetic fields.

14. The method as recited in claim 9, wherein the wrap angle is selected to provide about a predefined height of a concave region of the tenting of the magnetic recording tape above the sensor as determined using the detected magnetic fields.

15. The method as recited in claim 9, wherein the wrap angle is selected to provide about a predefined height of an inflection point of the tenting of the magnetic recording tape above the sensor as determined using the detected magnetic fields.

16. The method as recited in claim 9, wherein the tenting has a convex region beginning at the edge and transitioning to a concave region at an inflection point, an end of the tenting being where the concave region transitions to another tent or becomes essentially parallel to the tape bearing surface, the tenting being directly above the sensor.

17. A computer program product, 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 computer to cause the computer to perform a method comprising:

determining, by the computer, a first distance from a sensor to a first edge closest thereto, wherein the sensor is positioned between a lower shield and the first edge;

selecting, by the computer, a first wrap angle, set by a first guide, based on the first distance for inducing tenting of a moving magnetic recording tape above a tape bearing surface in a region directly above the sensor, the tenting causing the moving magnetic recording tape to form a tent having a convex region beginning at the first edge and transitioning to a concave region at an inflection point, an end of the tenting being where the concave region transitions to another tent or becomes essentially parallel to the tape bearing surface;

determining a second distance from a second edge to the sensor; and

selecting a second wrap angle, set by a second guide, based on the determined second distance for affecting or not affecting the tenting of a moving magnetic recording tape located directly above the sensor.

18. The computer program product recited in claim 17, wherein the first distance is a stored value, wherein the stored value is retrieved and used in a computation to calculate the first wrap angle.

19. The computer program product recited in claim 17, wherein the first distance is detected and used in a computation to calculate the first wrap angle.