公开(公告)号：US20150318010A1

公开(公告)日：2015-11-05

申请号：US14650139

申请日：2013-06-27

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Jun-ichi ASADA ,  Yuichi TAKAHASHI ,  Hiroaki MATSUMIYA ,  Kazuo MOMOO

IPC: G11B7/09 ,  G11B7/1365 ,  G11B7/1353

CPC classification number: G11B7/00458 ,  G02B5/1871 ,  G02B5/3016 ,  G02B27/286 ,  G11B7/0903 ,  G11B7/0912 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1365

Abstract: An optical pickup includes a light source 1; a diffraction element 2 for generating a write main beam and a read sub-beam via diffraction; an objective lens 5; a wavelength plate 9; a polarization hologram element 7 having a plurality of diffraction regions with different diffraction characteristics, designed so that each diffraction region separates a light beam reflected from the optical storage medium and transmitted through the wavelength plate into a 0th order light beam and ±1st order light beams; an actuator 11; and a photodetector 10 configured to detect a light beam reflected from the optical storage medium 6 and diffracted by the polarization hologram element 7. The photodetector 10 generates an RF signal from a detection result concerning a 0th order light beam derived from the main beam, generates a focus error signal and a tracking error signal from a detection result concerning one of ±1st order light beams derived from the main beam, and generates a signal indicating that data has been recorded normally from a detection result concerning a 0th order light beam derived from the sub-beam.

Abstract translation: 光拾取器包括光源1; 用于通过衍射产生写入主光束和读取子光束的衍射元件2; 物镜5; 波片9; 具有多个具有不同衍射特性的衍射区域的偏振全息元件7被设计成使得每个衍射区域将从光存储介质反射的光束分离并透过波长板成为第0级光束和±1级光束 ; 致动器11; 以及光检测器10，其被配置为检测从光存储介质6反射并被偏振全息元件7衍射的光束。光电检测器10根据从主光束导出的第0级光束的检测结果产生RF信号，产生 来自关于从主光束导出的±1级光束中的一个的检测结果的聚焦误差信号和跟踪误差信号，并且从根据来自于...的第0级光束的检测结果生成表示数据已被正常记录的信号 子光束。