公开(公告)号：US06999388B2

公开(公告)日：2006-02-14

申请号：US10131974

申请日：2002-04-24

申请人： Akira Mashimo ,  Chisato Takayama ,  Keishi Ueno

发明人： Akira Mashimo ,  Chisato Takayama ,  Keishi Ueno

IPC分类号： G11B7/00

CPC分类号： G11B7/0945 ,  G11B7/094

摘要： An optical disk apparatus capable of adjusting a focus servo and the like by precisely detecting a jitter amount. Light reflected from an optical disk is converted into an RF signal in an optical pickup and amplified by an RF amplifier before being supplied to an equalizer. The boost amount of the equalizer is set to zero during adjustment and set to a predetermined finite value (e.g., +20 dB) during normal recording and reproducing. By first setting the boost amount to zero, the delay characteristics of the RF signal from 3T to 11T are flattened such that an accurate jitter amount can be determined based on the integrated value of the phase differences of 3T to 11T, thereby allowing the optical pickup to be adjusted so as to minimize the jitter amount.