公开(公告)号：US20070280060A1

公开(公告)日：2007-12-06

申请号：US11752447

申请日：2007-05-23

Applicant: Hung-Chieh Tsai ,  Yu-Hsuan Lin ,  Hsiang-Ji Hsieh

Inventor： Hung-Chieh Tsai ,  Yu-Hsuan Lin ,  Hsiang-Ji Hsieh

IPC: G11B7/00

CPC classification number: G11B7/0956 ,  G11B7/00736

Abstract: The invention provides a servo calibration mark detection circuit for use in an optical disk drive. In one embodiment, the servo calibration mark detection circuit comprises a summing processor, a slicing level generator, and a comparator. The summing processor sums an intensity of a light beam reflected from both an inner groove and an outer groove to obtain a first signal. The slicing level generator generates a slicing level. The comparator then compares the first signal with the slicing level to obtain a second signal, wherein the second signal indicates a first location of a first servo calibration mark recorded on the inner groove and a second location of a second servo calibration mark recorded on the outer groove.

Abstract translation: 本发明提供一种用于光盘驱动器的伺服校准标记检测电路。 在一个实施例中，伺服校准标记检测电路包括求和处理器，限幅电平发生器和比较器。 求和处理器将从内槽和外槽两者反射的光束的强度相加以获得第一信号。 切片电平发生器产生切片电平。 比较器然后将第一信号与限幅电平进行比较以获得第二信号，其中第二信号指示记录在内槽上的第一伺服校准标记的第一位置和记录在外槽上的第二伺服校准标记的第二位置 槽。