| US 7,593,302 B2 | ||
| Recording strategy in multilevel recording | ||
| Masakuni Yamamoto, Yamato (Japan); Jun Sumioka, Kawasaki-si (Japan); and Kaoru Okamoto, Tokyo (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Oct. 16, 2006, as Appl. No. 11/549,759. | ||
| Claims priority of application No. 2005-310068 (JP), filed on Oct. 25, 2005. | ||
| Prior Publication US 2007/0091759 A1, Apr. 26, 2007 | ||
| Int. Cl. G11B 7/00 (2006.01) | ||
| U.S. Cl. 369—59.11 | 15 Claims |
| 6. An optical information recording/reproduction apparatus comprising:
a light source for irradiating laser light onto virtual cells provided at regular intervals on a track on an optical information
recording medium;
an information recording circuit for recording on the optical information recording medium multilevel information including
information of a level zero by changing widths in a track direction or sizes of information pits in the virtual cells; and
an information reproduction circuit for reproducing the recorded multilevel information,
wherein when the information of the level zero is recorded, said information recording circuit irradiates the laser light
at a power that is greater than an erasing power for erasing the information pits and that does not permit formation of the
information pits.
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