Magnetic recording medium and magnetic recording/reproducing system

• US 20040053074A1
• Filed: 03/26/2003
• Published: 03/18/2004
• Est. Priority Date: 03/27/2002
• Status: Abandoned Application

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Jingu, Nobuhiro, Watase, Shigeharu
• Application Number:
  US10/396,722
• Publication Number:
  US 20040053074A1
• Time in Patent Office: Days
• US Class Current: 428/694BB
• CPC Class Codes: G11B 5/65 characterised by its composition G11B5/66 takes precedence
• CPC Class Codes: G11B 5/735 characterised by the back layer magnetic recording media substrates G11B5/739
• CPC Class Codes: G11B 5/8404 manufacturing base layers

Abstract

The present invention provides a magnetic recording medium having a thinned film back coating layer as well as suppressed tribocharging by sliding to the tape guide pin on running, and having excellent running durability. The present invention also provides a magnetic recording/reproducing system using the magnetic recording medium above. A magnetic recording medium 1 which comprises at least a magnetic layer 3 and a protective layer 4 comprising a hard film containing carbon as a principal component in this order on one surface of a non-magnetic support 2, and comprises a metal layer 7 from 1 to 50 nm in thickness and a back coating layer 6 comprising a hard film containing carbon as a principal component in this order on the other surface of said non-magnetic support 2. A magnetic recording/reproducing system, for recording and reproducing a tape-like magnetic recording medium above, by using a magnetic recording/reproducing device having a member on which said hard film containing carbon as a principal component is formed at parts in contact with a surface of said back coating layer.

Claims

1. A magnetic recording medium which comprises at least a magnetic layer and a protective layer comprising a hard film containing carbon as a principal component in this order on one surface of a non-magnetic support, and comprises a metal layer from 1 to 50 nm in thickness and a back coating layer comprising a hard film containing carbon as a principal component in this order on the other surface of said non-magnetic support.

2. The magnetic recording medium according to claim 1, wherein said magnetic layer is a metal thin film type magnetic layer.

3. The magnetic recording medium according to claim 1, wherein said back coating layer comprising said hard film containing carbon as a principal component is formed by a vacuum film forming method.

4. The magnetic recording medium according to claim 1, wherein said back coating layer has a thickness of from 3 to 300 nm.

5. The magnetic recording medium according to claim 1, wherein said metal layer is formed by employing, as a raw material, at least one selected from the group consisting of Al, Ag, Cr, Cu, Mn, Ti, Co, Ni, Zn, and alloys of said metals.

6. The magnetic recording medium according to claim 1, wherein the electric resistivity of said metal layer is in the range of from 10⁻

2 to 10¹⁰ Ω

·

cm.

7. The magnetic recording medium according to claim 1, which further comprises a lubricant layer on said protective layer.

8. The magnetic recording medium according to claim 1, which further comprises a lubricant layer on said back coating layer.

9. A magnetic recording/reproducing system, for recording and reproducing a tape-like magnetic recording medium according to claim 1, by using a magnetic recording/reproducing device having a member on which the hard film containing carbon as a principal component is formed at parts in contact with a surface of said back coating layer.