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    • 2. 发明授权
    • Optical disc apparatus, focus position control method and recording medium
    • 光盘装置,聚焦位置控制方法和记录介质
    • US08248900B2
    • 2012-08-21
    • US12441147
    • 2007-09-13
    • Kimihiro SaitoToshihiro HorigomeTakao KondoKunihiko HayashiSeiji KobayashiTakashi IwamuraSakuya Tamada
    • Kimihiro SaitoToshihiro HorigomeTakao KondoKunihiko HayashiSeiji KobayashiTakashi IwamuraSakuya Tamada
    • G11B7/00
    • G11B7/0908G11B7/0065G11B7/083G11B7/0938G11B7/24044
    • An optical disc apparatus can highly accurately record a hologram representing information on or reproduce such a hologram from an optical disc. When recording information on an optical disc 100, the optical disc apparatus controls the position of an objective lens OL1 according to the outcome of detection of a red reflected light beam Lr2 so as to make the focus Fr thereof follow a target track and it also makes the focus Fb1 of a blue light beam Lb1 agree with a target mark position by the objective lens OL1 and also the focus Fb2 agree with the target mark position by controlling the position of another objective lens OL2 according to the outcome of detection of the blue light beam Lb1 by way of the objective lenses OL1 and OL2 so as to make the focus Fb1 of the blue light beam Lb1 and the focus Fb2 of the blue light beam Lb2 agree with the target mark position and the blue light beam Lb1 and the blue light beam Lb2 interfere with each other. Thus, as a result, the optical disc apparatus can record a recording mark RM at the target mark position.
    • 光盘装置可高精度地记录表示来自光盘的关于或再现这样的全息图的信息的全息图。 当在光盘100上记录信息时,光盘装置根据红色反射光束Lr2的检测结果来控制物镜OL1的位置,以使其焦点Fr跟随目标轨迹,并且还使得 蓝光束Lb1的焦点Fb1与物镜OL1的目标标记位置一致,并且通过根据蓝光的检测结果控制另一个物镜OL2的位置,焦点Fb2也与目标标记位置一致 通过物镜OL1和OL2使光束Lb1与蓝色光束Lb2的蓝色光束Lb1和焦点Fb2的焦点Fb1与目标标记位置和蓝色光束Lb1和蓝色光线一致 光束Lb2相互干扰。 因此,结果,光盘装置可以将记录标记RM记录在目标标记位置。