Patent ID: 7082085

Claim:
An information reproducing apparatus for reproducing information recorded on an optical recording 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 recording units, each of the recording units including a dropout portion in a circumferential direction of the groove structure, the dropout portion being 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 recording units being an integer multiple of the cycle of the wobble, the information reproducing apparatus comprising: an irradiation source for irradiating a light spot on the optical recording medium; an optical detection means for detecting a reflected light from the optical medium; and reproduction means for reproducing information by using a signal from the optical detection means.