Patent ID: 6545962
Filing Date: 2003-04-08
Classification: G11B

Abstract:
An optical reproducing method for reproducing information on an optical medium, including a disk-like substrate, a spiral or concentric-shaped groove structure along tracks formed on the disk-like substrate, each of the tracks being divided into a plurality of units, each of the units includes a dropout portion in a circumferential direction of the groove structure, the dropout portion a non-groove portion, the groove structure being formed with a wobble in a fixed cycle in a radial direction, the fixed cycle of the wobble continuing in the circumferential direction along the track, and each length of the units being an integer multiple of the cycle of the wobble, the method comprising the steps of:irradiating an optical spot on the optical medium; detecting a reflected beam from the optical medium; and reproducing information on the optical medium by using a signal obtained by the reflected beam.