公开(公告)号：US06580580B1

公开(公告)日：2003-06-17

申请号：US09601359

申请日：2000-08-01

申请人： Hiroaki Kojima ,  Kou Shinomori

发明人： Hiroaki Kojima ,  Kou Shinomori

IPC分类号： G11B5596

CPC分类号： G11B5/59677 ,  G11B7/09

摘要： In a magnetic memory drive, a diffraction grating 16 receives a beam emitted by a light source 1 to generate three beams of 0th-order and ±1st-order light beams, and a condensing system 17 converges the beams on a magnetic recording medium 4. The beams reflected from the medium is received by a photodetector 15 which outputs signals corresponding to quantities of the received beams, and a signal processor 61 processes the signals to output a tracking error. The photodetector comprises a plurality of light-receiving sections. When crosstalk from a light-receiving section for the 0th-order beam to light-receiving sections for the ±1st-order beams is &egr; and crosstalk from the light-receiving sections for the ±1st-order beam to the light-receiving section for the 0th-order is &egr;′0 in the light-receiving sections of the photodetector, quantity of light Q0 of the 0th-order light beam and quantity of light Q±1 of the ±1st-order light beams has a relationship represented by a following equation: Q 0 ⁢ : ⁢ Q ± 1 = 2 × ϵ ′ ϵ ⁢ : ⁢ 1. Thus, the tracking error is reduced.

摘要翻译： 在磁存储器驱动器中，衍射光栅16接收由光源1发射的光束，以产生0级和±1级光束的三束光，并且会聚系统17将光束会聚在磁记录介质4上。 从介质反射的光束由光电检测器15接收，光电检测器15输出对应于接收光束量的信号，信号处理器61处理信号以输出跟踪误差。 光检测器包括多个光接收部分。 当从0级光束的受光部到±1级光束的受光部的串扰是从±1级光束的光接收部到受光部的串扰为epsi， 在光检测器的光接收部分中的0阶是epsi'0，0级光束的光量Q0和±1级光束的光Q±1具有由 因此，跟踪误差降低。