Optical storage apparatus having track seek control unit providing improved seek performance

摘要

When an access of a 1-track seek is instructed from an upper apparatus, a 1-track seek period is divided into a predetermined accelerating period and decelerating period. A decelerating current is determined in accordance with a difference between sample points before and after a zero-cross point of a tracking error signal E2, namely, a beam velocity with respect to the decelerating period and is supplied. With regard to a fine seek as well, the decelerating current is determined from the beam velocity obtained from the difference between the sample points before and after the zero-cross point just before a target track and is supplied.