| Document
Code: PH A |
| [21] Application Number: | 1-2006-000325 |
| [54] Title: | SUBTRATE FOR MAGNETIC RECORDING MEDIA, MAGNETIC RECORDING MEDIA AND MAGNETIC RECORDING APPARATUS |
| [72] Inventor(s): |
AKIRA KIKITSU, OF , TOKYO, JAPAN MASATOSHI SAKURAI, OF , TOKYO, JAPAN YOSHIYUKI KAMATA, OF , TOKYO, JAPAN KATSUYUKI NAITO, OF , TOKYO, JAPAN MASAHIRO OKA, OF , TOKYO, JAPAN NAOKO KIHARA, OF , TOKYO, JAPAN |
| [73] Assignee(s): |
SHOWA DENKO K.K. , OF TOKYO, JAPAN KABUSHIKI KAISHA TOSHIBA , OF TOKYO, JAPAN |
| [74] Attorney/Agent: |
| [22] Date Filed: | 6/28/2006 |
| [30] | Priority Data: | ||||||||
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| [51] International Class: | G11B 5/62; G11B 5/64; G11B 5/706 |
| [57] Abstract: |
| A substrate for a magnetic recording media has circumferential protrusions corresponding to recording tracks and circumferential recesses corresponding to grooves between the recording tracks, in which the substrate satisfying at least one of conditions of (a) a surface of the recess has a surface energy smaller than that of the protrusion, (b) the surface of the recess is modified with a thermally decomposable or deformable substance, (c) the surface of the recess has surface roughness smaller than that of the protrusion, (d) crystal orientation is more disturbed on the surface of the recess than on the protrusion, (e) the surface of the recess is modified with a substance that causes reaction with a magnetic material or that diffuses into the magnetic material, and (f) the surface of the recess is modified with a substance soluble in a solvent or with a deformable substance. |
Representative Drawing(s):
| Search Report |
| [58] Field of Search: | G11B 5/62; G11B 5/64; G11B 5/706 |
| [56] Documents Considered to be Relevant |
| Category | Citation of Document |
| A | JP 05-205257 (TANAKA) AUGUST 13, 1993 |
| A | JP 08-115519 (KAEDE ET AL.) MAY 7, 1996 |
| A | JP 08-203058 (KAEDE ET AL.) AUGUST 9, 1996 |
| A | JP 2002-359138 (KAMATA ET AL.) DECEMBER 13,2002 |
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