发明申请
US20050226106A1 Optical pickup apparatus having optical detection area for compensating for tracking error offset
有权
具有用于补偿跟踪误差偏移的光学检测区域的光学拾取装置
- 专利标题: Optical pickup apparatus having optical detection area for compensating for tracking error offset
- 专利标题(中): 具有用于补偿跟踪误差偏移的光学检测区域的光学拾取装置
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申请号: US10896618申请日: 2004-07-22
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公开(公告)号: US20050226106A1公开(公告)日: 2005-10-13
- 发明人: Won-Jae Hwang , Ho-Seop Jeong , Dong-ik Shin
- 申请人: Won-Jae Hwang , Ho-Seop Jeong , Dong-ik Shin
- 优先权: KR2004-24163 20040408
- 主分类号: G11B7/09
- IPC分类号: G11B7/09 ; G11B7/00 ; G11B7/007 ; G11B7/13 ; G11B7/135
摘要:
The optical pickup apparatus includes a light emitting means, an optical means, and an optical detection means. The light emitting means emits a single beam. The optical means diffracts the single beam, focuses the optical spot of the diffracted beam on a track, and transmits the diffracted beam to an outside. The optical detection means includes a first optical detection unit on which a central beam having a 0-order diffraction coefficient is focused, and second and third optical detection units on which side beams having ±1 diffraction coefficients are focused, respectively. Each optical detection unit is segmented into a specific number of optical detection areas, and at least one of the optical detection units is provided with an optical detection area on which a tracking error signal used to compensate for tracking offset attributable to optical axis offset of an objective lens is not formed.