发明授权
- 专利标题： Optical pickup apparatus employing an adjusting circuit
- 专利标题（中）： 采用调整电路的光拾取装置
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申请号： US09998295申请日： 2001-12-03
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公开(公告)号： US06501715B2公开(公告)日： 2002-12-31
- 发明人: Kazushi Mori , Atsushi Tajiri , Yasuaki Inoue , Takenori Goto , Minoru Sawada , Akira Ibaraki , Daisuke Ide
- 申请人： Kazushi Mori , Atsushi Tajiri , Yasuaki Inoue , Takenori Goto , Minoru Sawada , Akira Ibaraki , Daisuke Ide
- 优先权： JP9-61492 19970314; JP9-61493 19970314; JP9-346913 19971216
- 主分类号： G11B7095
- IPC分类号： G11B7095
摘要：
A grating surface of a diffraction grating diffracts a laser beam emitted from a semiconductor laser device in ±1st order directions. The grating surface is formed in a rectangular or elliptic shape in such dimensions that a light spot formed on an objective lens by ±1st order diffracted beams is located in an aperture of the objective lens and not displaced from the aperture even if the objective lens is horizontally moved in a tracking operation. A grating surface of another diffraction grating has a width smaller than the width of an overlap region of a light spot on the diffraction grating corresponding to a part of a beam, diffracted in the ±1st direction, entering an objective lens and a light spot on the diffraction grating corresponding to a part of a beam, diffracted in the −1st direction, entering the objective lens.