Stepped time based servo pattern and head

• US 7,511,907 B2
• Filed: 02/17/2005
• Issued: 03/31/2009
• Est. Priority Date: 02/17/2004
• Status: Expired due to Fees

• Current Assignee: Advanced Research Corporation
• Original Assignee: Advanced Research Corporation
• Inventors: Dugas, Matthew P., Schwarz, Theodore A.
• Primary Examiner(s): Sniezek; Andrew L.
• Application Number:
  US11/060,627
• Publication Number:
  US 20050195525A1
• Time in Patent Office: 1,503 Days
• Field of Search: None
• US Class Current: 360/48
• CPC Class Codes: G11B 5/584 for track following on tapes
• CPC Class Codes: G11B 5/59638 Servo formatting apparatuses, e.g. servo-writers

Abstract

The present invention relates to apparatuses and methods used in manufacturing magnetic tape. More specifically, the present invention relates to a method of writing a servo pattern on magnetic tape so as to minimize errors in the servo pattern, the heads used to write such servo data, and the magnetic tape manufactured with such heads. Errors in the servo pattern may be minimized by synthesizing the slanted transitions in a time based servo pattern using servo write gaps that are perpendicular to the tape motion. In so minimizing errors, distortion in the reading and/or writing of the data tracks can be prevented.

Claims

1. Magnetic tape comprising a substrate and a magnetic layer, the magnetic tape having at least one servo track that includes servo data and having a servo pattern comprising write gaps in which slanted, non-perpendicular to the tape motion portions of the write gaps are synthesized by a series of short, staggered, normal to the tape motion segments.

2. The magnetic tape of claim 1, wherein the magnetic tape is made by writing a servo pattern using write gaps in which slanted, non-perpendicular to the tape motion portions of the write gaps are synthesized by a series of short, staggered, normal to the tape motion segments and wherein the normal to the tape motion segments are terminated with circular openings.

3. The magnetic tape of claim 1, wherein the normal to the tape motion segments are connected by segments perpendicular to the normal to the tape motion segments.

4. The magnetic tape of claim 1, wherein the segments perpendicular to the normal to the tape motion segments are much smaller than the width of the write gaps.

5. Magnetic tape comprising a substrate and a magnetic layer, the magnetic tape having at least one servo track that includes servo data, the servo data comprising a servo pattern simulating a slanted magnetic transition in each of one or more of the at least one servo track comprising non-contiguous write gap segments in a staggered pattern.

6. The magnetic tape of claim 5, wherein the magnetic tape is made by writing a servo pattern simulating a slanted magnetic transition to each of one or more of the at least one servo track using non-contiguous write gap segments, terminated with circular openings, in a staggered pattern.

7. The magnetic tape of claim 6, wherein the circular openings are larger than the write gap segments.

8. Magnetic tape comprising a substrate and a magnetic layer, the magnetic tape having at least one timing-based servo track that includes servo data, the servo data comprising a magnetic transition of a timing-based servo pattern in each of one or more of the at least one timing-based servo track comprising a series of short areas of magnetic material in a staggered pattern.

9. An apparatus for use in writing servo data on a magnetic tape, comprising:

a servowriting head;

a magnetic film on the head; and

one or more write gaps created in the magnetic film, wherein slanted, non-perpendicular to the tape motion portions of said write gaps are synthesized by a series of short, staggered, normal to the tape motion segments and segments perpendicular to the normal to the tape motion segments, wherein the segments perpendicular to the normal to the tape motion segments are much smaller than the width of the write gaps.

10. The apparatus of claim 9, wherein the write gaps are terminated with circular openings.

11. The apparatus of claim 9, wherein the segments perpendicular to the normal to the tape motion segments are much smaller than the normal to the tape motion segments of the write gaps.

12. A method of writing servo data on a servo track of a magnetic tape, comprising writing said data with write gaps, wherein slanted, non-perpendicular to the tape motion portions of said write gaps are synthesized by a series of short, staggered, normal to the tape motion.

13. The method of claim 12, wherein the normal to the tape motion segments are terminated with circular openings.