公开(公告)号：DE60214336T2

公开(公告)日：2007-08-30

申请号：DE60214336

申请日：2002-01-15

Applicant: SONY CORP

Inventor： FUKASAWA NORIO ,  SUZUKI JUNICHI ,  TANAKA TETSU ,  KUBO TAKESHI

IPC: G11B7/09 ,  G02B5/18 ,  G02B6/34 ,  G11B7/135 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1381

Abstract: This invention is an optical pickup device having a composite optical element (32) which has a first diffraction grating (45) for splitting a light beam emitted from a light source (31) into zeroth-order light, plus-first-order light and minus-first-order light, a second diffraction grating (46) for diffracting the optical path of a return light beam from an optical disc (2), and a split prism (47) arranged at a position where the minus-first-order light diffracted by the second diffraction grating (46) is incident and adapted for splitting the minus-first-order light into a plurality of light beams. It also has a light receiving unit (35) for acquiring a focusing error signal FE by receiving each return light beam split by the split prism (47) and for acquiring a tracking error signal by receiving return light beams from the optical disc (2) of the plus-first-order light and the minus-first-order light split by the first diffraction grating (45).

公开(公告)号：DE60214336T8

公开(公告)日：2007-12-13

申请号：DE60214336

申请日：2002-01-15

Applicant: SONY CORP

Inventor： FUKASAWA NORIO ,  SUZUKI JUNICHI ,  TANAKA TETSU ,  KUBO TAKESHI

IPC: G11B7/09 ,  G02B5/18 ,  G02B6/34 ,  G11B7/135 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1381

Abstract: This invention is an optical pickup device having a composite optical element (32) which has a first diffraction grating (45) for splitting a light beam emitted from a light source (31) into zeroth-order light, plus-first-order light and minus-first-order light, a second diffraction grating (46) for diffracting the optical path of a return light beam from an optical disc (2), and a split prism (47) arranged at a position where the minus-first-order light diffracted by the second diffraction grating (46) is incident and adapted for splitting the minus-first-order light into a plurality of light beams. It also has a light receiving unit (35) for acquiring a focusing error signal FE by receiving each return light beam split by the split prism (47) and for acquiring a tracking error signal by receiving return light beams from the optical disc (2) of the plus-first-order light and the minus-first-order light split by the first diffraction grating (45).

公开(公告)号：DE60214336D1

公开(公告)日：2006-10-12

申请号：DE60214336

申请日：2002-01-15

Applicant: SONY CORP

Inventor： FUKASAWA NORIO ,  SUZUKI JUNICHI ,  TANAKA TETSU ,  KUBO TAKESHI

IPC: G11B7/09 ,  G02B5/18 ,  G02B6/34 ,  G11B7/135 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1381

Abstract: This invention is an optical pickup device having a composite optical element (32) which has a first diffraction grating (45) for splitting a light beam emitted from a light source (31) into zeroth-order light, plus-first-order light and minus-first-order light, a second diffraction grating (46) for diffracting the optical path of a return light beam from an optical disc (2), and a split prism (47) arranged at a position where the minus-first-order light diffracted by the second diffraction grating (46) is incident and adapted for splitting the minus-first-order light into a plurality of light beams. It also has a light receiving unit (35) for acquiring a focusing error signal FE by receiving each return light beam split by the split prism (47) and for acquiring a tracking error signal by receiving return light beams from the optical disc (2) of the plus-first-order light and the minus-first-order light split by the first diffraction grating (45).

公开(公告)号：SG73658A1

公开(公告)日：2000-06-20

申请号：SG1999003312

申请日：1999-07-07

Applicant: SONY CORP

Inventor： YAMADA TAKATOSHI ,  FUKASAWA NORIO

IPC: G11B7/08 ,  G11B7/125 ,  G11B7/135 ,  G11B7/1374 ,  G11B7/00

Abstract: An optical lens composed of a transparent material, wherein one surface thereof on a light source side is a convex aspherical surface of rotation symmetry defined by a function relative to the radial distance from an optical axis. The aspherical surface is shaped to be a curved one without any stepped region with regard to the radial direction in the defined area, and has a portion where the derivatives of the function are discontinuous at a predetermined radial position. Although not equipped with an iris diaphragm, this optical lens is capable of eliminating an incident light beam outside the optical effective surface thereof without deteriorating the optical characteristics.

公开(公告)号：EP1351227A4

公开(公告)日：2005-02-09

申请号：EP02729580

申请日：2002-01-15

Applicant: SONY CORP

Inventor： FUKASAWA NORIO ,  SUZUKI JUNICHI ,  TANAKA TETSU ,  KUBO TAKESHI

IPC: G02B5/18 ,  G02B6/34 ,  G11B7/09 ,  G11B7/135

CPC classification number: G11B7/0912 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1381

Abstract: This invention is an optical pickup device having a composite optical element (32) which has a first diffraction grating (45) for splitting a light beam emitted from a light source (31) into zeroth-order light, plus-first-order light and minus-first-order light, a second diffraction grating (46) for diffracting the optical path of a return light beam from an optical disc (2), and a split prism (47) arranged at a position where the minus-first-order light diffracted by the second diffraction grating (46) is incident and adapted for splitting the minus-first-order light into a plurality of light beams. It also has a light receiving unit (35) for acquiring a focusing error signal FE by receiving each return light beam split by the split prism (47) and for acquiring a tracking error signal by receiving return light beams from the optical disc (2) of the plus-first-order light and the minus-first-order light split by the first diffraction grating (45).

Abstract translation: 本发明是一种具有复合光学元件（32）的光学拾取装置，该复合光学元件具有第一衍射光栅（45），用于将从光源（31）发射的光束分解为零级光，一级光，以及 负一级光，用于衍射来自光盘（2）的返回光束的光路的第二衍射光栅（46）和布置在负一级光的位置处的分割棱镜（47） 被第二衍射光栅（46）衍射的光入射并适于将负一级光分解成多个光束。 它还具有一个光接收单元（35），用于通过接收由分裂棱镜（47）分离的每个返回光束并通过接收来自光盘（2）的返回光束来获取跟踪误差信号来获取聚焦误差信号FE， 的第一衍射光栅（45）分开的正一级光和负一级光。