Patent ID: 6262968
Filing Date: 2001-07-17
Classification: G11B

Abstract:
An optical information processing apparatus including 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, and an address information prepit of respective first and second prepit portions is arranged on a boundary of the respective tracks, wherein the first prepit portions include the address information prepit arranged at every two-track pitch in the radial direction, the second prepit portions include the address information prepit arranged at every two-track pitch in the radial direction, and the address information prepit of the first prepit portion and the address information prepit of the second prepit portion of the same track are arranged at opposite boundaries of the same track so as to be meanderingly arranged with respect to a center line of the track, the tracks being alternately arranged groove and land portions in the radial direction, comprising:a motor which rotates the optical recording medium;light irradiation means which irradiates an optical spot on the optical recording medium; andoptical detection means which detects a reflected light from the optical recording medium to obtain a reproduced signal;wherein said light irradiation means irradiates the optical spot having a predetermined spot diameter to detect the prepits meandered through the center line among the meanderingly arranged prepits through center lines of the groove and land portions when a circumferential direction by said optical detection means in irradiating the optical spot on the prepit portion.