Title:
MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2006/003985
Kind Code:
A1
Abstract:
A magnetic recording medium has a picture formed by a picture forming reagent in a layered body formed by a plurality of layers including a basic layer and a magnetic recording layer. The picture can be recognized from a surface of the direction opposite to the basic layer of the layered body. The picture forming reagent is distributed in the film thickness direction and has a region having a concentration gradient gradually decreasing toward the direction of the magnetic recording reading side from the center portion of the magnetic recording layer in the region of the read side from the center portion of the magnetic recording layer in the layered body.
Inventors:
YAMAZAKI YOSHIKAZU (JP)
YANO DAISUKE (JP)
YANO DAISUKE (JP)
Application Number:
PCT/JP2005/012064
Publication Date:
January 12, 2006
Filing Date:
June 30, 2005
Export Citation:
Assignee:
DAINIPPON INK & CHEMICALS (JP)
YAMAZAKI YOSHIKAZU (JP)
YANO DAISUKE (JP)
YAMAZAKI YOSHIKAZU (JP)
YANO DAISUKE (JP)
International Classes:
G06K19/06; G11B5/80; G11B5/84; B42D25/45; (IPC1-7): B42D15/10; G06K19/06; G11B5/80; G11B5/84
Foreign References:
| JP2001266335A | 2001-09-28 | |||
| JPH09309287A | 1997-12-02 | |||
| JPH02201728A | 1990-08-09 |
Other References:
See also references of EP 1780044A4
None
None
Attorney, Agent or Firm:
Shiga, Masatake (Yaesu Chuo-ku, Tokyo 53, JP)
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