发明申请
- 专利标题: Optical pickup device and optical disk device and optical device and composite optical element
- 专利标题(中): 光拾取装置和光盘装置以及光学装置和复合光学元件
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申请号: US10492657申请日: 2002-11-19
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公开(公告)号: US20050088951A1公开(公告)日: 2005-04-28
- 发明人: Norio Fukasawa , Junichi Suzuki , Kiyoshi Toyota , Tetsu Tanaka , Takeshi Kubo , Masahiro Saito , Satoru Ishii
- 申请人: Norio Fukasawa , Junichi Suzuki , Kiyoshi Toyota , Tetsu Tanaka , Takeshi Kubo , Masahiro Saito , Satoru Ishii
- 优先权: JP2001-358244 20011122
- 国际申请: PCT/JP02/12079 WO 20021119
- 主分类号: G11B7/00
- IPC分类号: G11B7/00 ; G11B7/09 ; G11B7/135
摘要:
An optical pickup device is provided which includes a first diffraction grating (45) that splits a light beam emitted from a light-emitting/-detecting element (31) into a zero-order light beam and positive and negative first-order light beams, a second diffraction grating (46) that diffracts return light from an optical disk (2) for traveling along a light path separate from that of the outgoing light, and a third diffraction grating (47) that corrects the deviation of the light path by diffracting the positive first-order light beam diffracted by the second diffraction grating (46). The light-emitting/-detecting element (31) provides a focusing error signal FE by detecting the negative first-order light beam, and a tracking error signal by detecting return portions of the positive and negative first-order light beams from the first diffraction grating (45).