| US 7,577,081 B2 | ||
| Information recording medium, and recording method and reproducing method thereof | ||
| Yasuhiro Ueki, Sagamihara (Japan) | ||
| Assigned to Victor Company of Japan, Limited, Yokohama (Japan) | ||
| Filed on Oct. 26, 2007, as Appl. No. 11/925,103. | ||
| Application 11/925103 is a continuation of application No. 11/306064, filed on Dec. 15, 2005, granted, now 7,315,507. | ||
| Application 11/306064 is a continuation of application No. 11/131424, filed on May 18, 2005, granted, now 7,023,791. | ||
| Application 11/131424 is a continuation of application No. 09/854557, filed on May 15, 2001, granted, now 6,965,555. | ||
| Claims priority of application No. 2000-145353 (JP), filed on May 17, 2000; and application No. 2000-252827 (JP), filed on Aug. 23, 2000. | ||
| Prior Publication US 2008/0056110 A1, Mar. 06, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G11B 7/24 (2006.01) | ||
| U.S. Cl. 369—275.3 [369/30.1; 369/44.26; 369/53.35] | 5 Claims |
| 1. An information recording medium comprising:
a recordable area for information provided with an information track formed spirally or in coaxial circles having a groove
in a first depth being prerecorded with a frequency signal and a land pre-pit address signal from an inner circumference of
said information track and enabling to record ECC blocked data added with an error correction code;
a first read only area having a pit in a second depth prerecorded with a frequency signal to be recorded with control data
to be reproduced as a pit; and
a second read only area having a pit in said first depth prerecorded with a frequency signal and a land pre-pit address signal
to be recorded with a reproduction signal as a pit,
wherein each tracking error signal at a time of tracking off in a boundary between said recordable area and said first read
only area and another boundary between said first record only area and said second read only area is defined as a ratio of
maximum amplitude in both directions from a center of maximum amplitude of said tracking error signal at the time of tracking
off in said recordable area.
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