公开(公告)号：EP1993092A4

公开(公告)日：2009-04-01

申请号：EP07707245

申请日：2007-01-23

Applicant: PANASONIC CORP

Inventor： MATSUZAKI KEIICHI ,  KOMMA YOSHIAKI ,  TANAKA TOSHIYASU ,  SANO KOUSEI ,  WAKABAYASHI KANJI ,  WADA HIDENORI

IPC: G11B7/135

CPC classification number: G11B7/1353 ,  G11B7/1362 ,  G11B7/1376 ,  G11B7/13925 ,  G11B2007/0013

Abstract: A small optical pickup having a wide correction range of spherical aberration. The optical pickup comprises a rising mirror (4) for deflecting a light beam approximately perpendicularly and leading it toward the plane of incidence of an objective lens, a spherical aberration correction lens (2) having a curvature larger on one side than on the other side, a lens holder (9) for holding the spherical aberration correction lens (2) such that the plane of larger curvature projects partially to the rising mirror side, guide members (11, 42, 72) extending in the direction of optical axis (L) of a spherical aberration correction lens (s) and having an end arranged up to the side of the plane of reflection of the rising mirror (4), and portions (15, 36, 16d) sliding along the guide members (11, 42, 72). The projecting portions of the sliding portions (15, 36, 16d) are arranged to be confined in the side face of the reflective plane of the rising mirror (4), and when the spherical aberration correction lens (2) most closely approaches the rising mirror (4), the portion of the spherical aberration correction lens projecting from the lens holder overlaps the reflective plane of the rising mirror (4).