OPTICAL PICKUP, OPTICAL DISK DRIVE DEVICE, OPTICAL INFORMATION MEMORY DEVICE, AND OPTICAL INFORMATION REPRODUCTION DEVICE,申请号WO2011JP00089-传众专利搜索

OPTICAL PICKUP, OPTICAL DISK DRIVE DEVICE, OPTICAL INFORMATION MEMORY DEVICE, AND OPTICAL INFORMATION REPRODUCTION DEVICE

申请公布号：WO2011086897(A1)

申请号：WO2011JP00089

申请日期：2011.01.12

申请公布日期：2011.07.21

申请人：

PANASONIC CORPORATION;MATSUZAKI, KEIICHI;SANO, KOUSEI

发明人：MATSUZAKI, KEIICHI;SANO, KOUSEI

分类号：G11B7/09;G11B7/095;G11B7/1372;G11B7/1374;G11B7/1387

主分类号：G11B7/09

摘要：<p>Provided are an optical pickup, an optical disk drive device, an optical information memory device, and an optical information reproduction device which can precisely detect a reproduction signal, a focus error signal and a gap error signal, in storing information in an optical information medium including multiple information memory layers or reproducing information therefrom. The optical pickup comprises a condenser lens group (7) which includes a solid immersion lens (8) and condenses light, a first detector lens (11) for condensing reflected light from an optical information medium (9) on a first detector (12), and a second detector lens (13) for condensing reflected light from a flat portion of the solid immersion lens (8) on a second detector (14). The optical magnification M of a first optical system including the condenser lens group (7) and the first detector lens (11) and the optical magnification m of a second optical system including the condenser lens group (7) and the detector lens (13) are set so as to satisfy a relation M>m.</p>