Patent ID: 7085208
Filing Date: 2006-08-01
Classification: G11B

Abstract:
1. 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 of the groove structure along the track in a circumferential direction of the track, the dropout portion being a non-groove portion, and the groove structure being wobbled in a fixed cycle in a radial direction, the fixed cycle of the wobble continuing in the circumferential direction along the track, wherein when the wobble is formed in the circumferential direction of the track, the dropout portion is formed so that a phase of the wobble is continued with a phase of the wobble of the groove structure within another recording unit adjacent to the dropout portion, 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.