TAPE HEAD AND SYSTEM HAVING ASYMMETRICAL CONSTRUCTION

• US 20180122409A1
• Filed: 11/02/2017
• Published: 05/03/2018
• 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 10,395,674 B2
• Time in Patent Office: Days
• 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 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.

2. The method recited in claim 1, wherein the first distance is a stored value, wherein the stored value is retrieved.

3. The method recited in claim 1, wherein the first distance is detected.

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 from the magnetic recording tape; and

selecting a wrap angle 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 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. A computer-implemented method, comprising:

receiving a measurement of a first distance from a first edge to a sensor;

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

calculating a wrap angle to create the predefined height of tenting when the magnetic recording tape passes over the first edge in a direction of tape travel.

14. The method recited in claim 13, wherein the first distance is a stored value, wherein the stored value is retrieved.

15. The method recited in claim 13, wherein the first distance is detected.

16. The method recited in claim 13, wherein the first distance is measured mechanically.

17. The method recited in claim 13, wherein the first distance is measured optically.