Title:
INFORMATION RECORDING MEDIUM AND MASTER EXPOSING DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/069078
Kind Code:
A1
Abstract:
In an information recording medium having a plurality of recording regions of
different track pitches and groove shapes, it is possible to realize stable focus
servo and tracking servo. A recording track formed by a convex/concave pattern
includes a first and a second recording region (R1, R2) and a recording region
transition section (Sx) arranged between the first and the second recording
region (R1, R2). The first recording region (R1) has a track pitch tp1, groove
width w1, and a groove depth d1 and the second recording region (R2) has a track
pitch tp2, a groove width w2, and a groove depth d2. These track pitches, the groove
widths, and the groove depths satisfy Expression (1) and Expression (2) and/or
Expression (3). 0 < |tp1 - tp2| (1) 0 < |w1 - w2| (2) 0 < |d1 - d2| (3) The recording
region transition section Sx includes a track pitch transition section Stp where
the track pitch changes from tp1 to tp2 and a groove shape transition section Sg
where the groove width changes from w1 to w2 and/or the groove depth changes from
d1 to d2. The track pitch transition section Stp and the groove shape transition
section Sg shares at least a partial region SL.
Inventors:
SASAKI HIDEHIRO (JP)
KUBO MASAE (JP)
KIYONO KENJIROU (JP)
KUBO MASAE (JP)
KIYONO KENJIROU (JP)
Application Number:
PCT/JP2007/072984
Publication Date:
June 12, 2008
Filing Date:
November 28, 2007
Export Citation:
Assignee:
MITSUBISHI KAGAKU MEDIA CO LTD (JP)
SASAKI HIDEHIRO (JP)
KUBO MASAE (JP)
KIYONO KENJIROU (JP)
SASAKI HIDEHIRO (JP)
KUBO MASAE (JP)
KIYONO KENJIROU (JP)
International Classes:
G11B7/24035; G11B7/24076; G11B7/24079; G11B7/24085; G11B7/246; G11B7/26
Foreign References:
| JPH10198961A | 1998-07-31 | |||
| JPS63103454A | 1988-05-09 | |||
| JPH05198012A | 1993-08-06 | |||
| JP2003346384A | 2003-12-05 | |||
| JP2002092890A | 2002-03-29 | |||
| JP2003346384A | 2003-12-05 | |||
| JP2006012355A | 2006-01-12 | |||
| JPS57187604A | 1982-11-18 | |||
| JP2006324452A | 2006-11-30 | |||
| JP2007073272A | 2007-03-22 |
Other References:
See also references of EP 2091042A4
Attorney, Agent or Firm:
SENMYO, Kenji et al. (SIA Kanda Square17, Kanda-konyacho, Chiyoda-ku, Tokyo 35, JP)
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