Information recording tape

• US 20050264935A1
• Filed: 05/27/2005
• Published: 12/01/2005
• Est. Priority Date: 05/28/2004
• Status: Abandoned Application

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Sueki, Minoru, Ejiri, Kiyomi
• Application Number:
  US11/138,351
• Publication Number:
  US 20050264935A1
• Time in Patent Office: Days
• US Class Current: 360/134
• CPC Class Codes: G11B 5/70 on a base layer
• CPC Class Codes: G11B 5/78 Tape carriers

Abstract

An information recording tape including a data-recording area and a non-data-recording area, with the data-recording area having a center-line average surface roughness Ra smaller than 3 nm and at most 100/mm² of protuberances standing at least 20 nm high, and with the non-data-recording area having a center-line average surface roughness Ra greater than 2 nm and more than 100/mm² of protuberances standing at least 20 nm high.

Claims

1. An information recording tape comprising a data-recording area and a non-data-recording area, wherein

the data-recording area has a first center-line average surface roughness Ra smaller than 3 nm and first protuberances having at least 20 nm heights at 100/mm² or less and

the non-data-recording area has a second center-line average surface roughness Ra greater than 2 nm and second protuberances having at least 20 nm heights at 100/mm² or more.

2. The information recording tape according to claim 1, wherein a first center-line average surface roughness Ra is 1 to 2.5 nm.

3. The information recording tape according to claim 1, wherein a first center-line average surface roughness Ra is 1 to 2 nm.

4. The information recording tape according to claim 1, wherein the data-recording area has first protuberances having heights of 20 to 60 nm at 100/mm² or less.

5. The information recording tape according to claim 1, wherein the data-recording area has first protuberances having heights of 20 to 40 nm at 100/mm² or less.

6. The information recording tape according to claim 1, wherein the data-recording area has first protuberances having at most 20 nm heights at 1 to 50/mm².

7. The information recording tape according to claim 1, wherein the data-recording area has first protuberances having at most 20 nm heights at 1 to 20/mm².

8. The information recording tape according to claim 1, wherein a second center-line average surface roughness Ra is 3 to 10 nm.

9. The information recording tape according to claim 1, wherein a second center-line average surface roughness Ra is 3 to 7 nm.

10. The information recording tape according to claim 1, wherein the non-data-recording area has second protuberances having heights of 20 to 60 nm at 100/mm² or more.

11. The information recording tape according to claim 1, wherein the non-data-recording area has second protuberances having heights of 20 to 40 nm at 100/mm² or more.

12. The information recording tape according to claim 1, wherein the data-recording area has second protuberances having at most 20 nm heights at 200 to 500/mm².

13. The information recording tape according to claim 1, wherein the data-recording area has second protuberances having at most 20 nm heights at 200 to 300/mm².

14. The information recording tape according to claim 1, wherein the information recording tape is a magnetic tape.

15. The information recording tape according to claim 14, wherein the magnetic tape comprises a support and a magnetic layer containing a binder and a ferromagnetic powder dispersed in the binder.

16. The information recording tape according to claim 15, wherein the magnetic tape further comprises a back layer.

17. The information recording tape according to claim 15, wherein the magnetic tape further comprises a non-magnetic layer between the support and the magnetic layer.