发明名称 |
Optical pickup, optical recording and/or reproducing apparatus using the same, and method for detecting tracking error signal |
摘要 |
<p>An optical pickup and an optical recording and/or reproducing apparatus employing the optical pickup, wherein the optical pickup includes: a light source (11); an objective lens (17) to collect and focus an incident beam on an information storage medium (10); a holographic grating (13) to split light emitted by the light source (11) into a main beam and first and second sub-beams by diffraction and to provide, or create, a continuously changing wavefront in the first and second sub-beams to reduce the amplitude of an AC component of a sub-push-pull (SPP) signal of the first and second sub-beams; and a photodetector (19) to receive the main beam and the first and second sub-beams that are focused on and reflected from the information storage medium (10) and to obtain a main push-pull (MPP) signal of the main beam and a SPP signal of the first and second sub-beams.
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申请公布号 |
EP1708184(A3) |
申请公布日期 |
2007.05.02 |
申请号 |
EP20060111972 |
申请日期 |
2006.03.30 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
CHOI, WOO-SEOK;KIM, TAE-KYUNG;CHUNG, CHONG-SAM |
分类号 |
G11B7/09 |
主分类号 |
G11B7/09 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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