| US 7,580,329 B2 | ||
| Optical recording medium recorded with information in depth direction, and method and apparatus of reproduction therefrom | ||
| Junsaku Nakajima, Kashihara (Japan); Hitoshi Takeuchi, Kitakatsuragi-Gun (Japan); Masaru Nomura, Nabari (Japan); and Kenji Ohta, Kitakatsuragi-Gun (Japan) | ||
| Assigned to Sharp Kabushiki Kaisha, Osaka (Japan) | ||
| Filed on Jan. 24, 2006, as Appl. No. 11/339,759. | ||
| Application 11/339759 is a division of application No. 09/824554, filed on Apr. 02, 2001, granted, now 7,050,383. | ||
| Claims priority of application No. 2000-102088 (JP), filed on Apr. 04, 2000. | ||
| Prior Publication US 2007/0177489 A1, Aug. 02, 2007 | ||
| Int. Cl. G11B 7/00 (2006.01) | ||
| U.S. Cl. 369—44.26 [369/47.1] | 8 Claims |
| 1. A reproduction method of an optical recording medium
recorded with information on a substrate, said optical recording medium including a first region having first information
recorded at least in a depth direction of said substrate by pits of at least two different depths formed on said substrate,
and a second region having second information recorded in a plane direction of said substrate by at least one of the presence/absence,
the length, the width and the position of a pit formed on said substrate, said reproduction method comprising the steps of:
reproducing said first information in said first region based on a polarity of a tangential push-pull signal obtained from
said pits, said polarity differing according to the depth of a pit, and
reproducing said second information in said second region based on a signal representing a quantity of reflected light obtained
from said pit.
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