Patent Number: 7,085,222

Title: Optical reproducing method for optical medium with aligned prepit portion

Abstract: A reproducing method for reproducing information recorded on an optical recording medium having an aligned prepit portion straddled on a plurality of tracks in a radial direction, the prepit portion including first and second prepit portions divided in a track direction and arranged on a boundary line of the respective tracks. The first and second prepit portions each have address information prepits arranged at every two-track pitch in the radial direction, and the address information prepit of the first and second prepit portions are arranged with one track displaced in the radial direction. The method includes irradiating an optical spot on the medium, detecting a reflected beam from the medium, and reproducing information on the medium by using a signal obtained by the reflected beam.

Inventors: Miyamoto; Harukazu (Kodaira, JP), Sukeda; Hirofumi (Tokorozawa, JP), Terao; Motoyasu (Tokyo, JP), Minemura; Hiroyuki (Yokohama, JP), Andou; Tetsuo (Kokubunji, JP)

Assignee: Hitachi, Ltd.

International Classification: G11B 7/24 (20060101)

Expiration Date: 8/01/02018