Patent ID: 6483800
Filing Date: 2002-11-19
Classification: G11B

Abstract:
An optical reproduction apparatus for reproducing information from an optical recording medium having an aligned prepit portion straddled on a plurality of tracks in a radial direction;wherein the prepit portion includes first and second prepit portions divided in a track direction; wherein a prepit of the respective first and second prepit portions is arranged on a boundary of the respective tracks; wherein the first prepit portion has an address information prepit and a synchronous information prepit; wherein the second prepit portion has a synchronous information prepit; wherein the prepit of the first prepit portion and the prepit of the second prepit portion are arranged at every two-track pitch in the radial direction; wherein the prepit of the first prepit portion and the prepit of the second prepit portion are arranged with one track displaced in the radial direction; and wherein a trailing edge of an end prepit of the first prepit portion is aligned in the radial direction; the optical reproduction apparatus comprising: an irradiation source for irradiating a light spot on the optical recording medium; a detector for detecting a reflected light from the optical recording medium; and reproduction means for reproducing information by using a signal from the detector.