公开(公告)号：WO2003041066A1

公开(公告)日：2003-05-15

申请号：PCT/JP2002/011538

申请日：2002-11-05

Applicant: シャープ株式会社 ,  酒井 啓至 ,  三宅 隆浩 ,  上山 徹男 ,  三木 錬三郎 ,  平島 廣茂 ,  藤田 昇 ,  宮崎 修

Inventor： 酒井 啓至 ,  三宅 隆浩 ,  上山 徹男 ,  三木 錬三郎 ,  平島 廣茂 ,  藤田 昇 ,  宮崎 修

IPC: G11B7/135

CPC classification number: G11B7/1353 ,  G11B7/0901 ,  G11B7/094 ,  G11B7/123 ,  G11B7/131

Abstract: A light integration unit capable of providing a stable tracking servo performance by preventing an offset from being produced by the shifting of an objective lens and the inclination of a disk when a one-beam tracking method eliminating a reduction in quantity of light of a main beam is used, wherein a diffraction grating is disposed between a hologram and a light receiving part and the diffraction efficiency thereof is differentiated in the longitudinal direction of the grating, for example, when the ray of light incident on the diffraction grating is shifted as an offset in the longitudinal direction of the grating, the quantity of receiving light varies in light receiving areas, and a tracking servo is performed so as to cancel the change, whereby the offset can be compensated, and the stable tracking servo performance can be provided.

Abstract translation: 一种能够提供稳定的跟踪伺服性能的光集成单元，其能够通过防止由单个光束跟踪方法消除主光束的光量的减少而使物镜的偏移产生偏移和盘的倾斜 使用衍射光栅，其中衍射光栅设置在全息图和光接收部分之间，并且其衍射效率在光栅的纵向方向上是不同的，例如当入射在衍射光栅上的光线偏移为偏移时 在光栅的纵向方向上，接收光的量在光接收区域中变化，并且执行跟踪伺服以抵消变化，从而可以补偿偏移，并且可以提供稳定的跟踪伺服性能。