| 摘要 |
<p>In this invention, when a command indicating movement to a land or groove is output while a beam condensed by an objective lens tracks a groove or land, the polarity is inverted, and a jump pulse is generated. Tracking servo control is stopped during generation of the jump pulse, thereby changing the tracking position from the groove or land to the land to groove. With this operation, the tracking position can be accurately changed from the groove or land to the land or groove for an optical disk (53) having concentrical or spiral grooves and lands as recording tracks. Also in this invention, when a switching position is detected while the beam condensed by the objective lens tracks the groove or land, the polarity is inverted. At the same time, tracking servo control is stopped to change the tracking position from the groove or land to the land or groove. With this operation, the tracking position can be accurately changed from the groove or land to the land or groove in an optical disk (54) in which lands and grooves are alternately formed in units of rounds and linked together. <IMAGE></p> |
