发明名称 |
Optical head, optical information apparatus, and optical-information reproducing method |
摘要 |
An optical head (201) is provided which is capable of realizing a stable tracking control, even if the rotational center (208) of an information recording medium is not located on the extension line (206) of the transfer directions of a light-concentrating element. This optical head includes: a semiconductor laser which emits a beam of light; an objective lens which concentrates the beam of light on an optical disk; a transfer mechanism which transfers the objective lens between the outermost circumference and the innermost circumference of the recording area of the optical disk along the optical disk; and a photo-detector (214) which detects a beam of light that returns from the optical disk. The photo-detector includes a plurality of areas which are divided by a division line. The division line is set parallel to the tangential directions of the track in a predetermined position on the transfer line of the objective lens between the outermost circumference and the innermost circumference of the recording area, and the plurality of areas are divided, by a lateral division line which intersects the division line, into a first area on which a beam of light that mainly includes a tracking component is incident and a second area on which a beam of light that does not include the tracking component is incident. |
申请公布号 |
EP1607952(A3) |
申请公布日期 |
2006.10.11 |
申请号 |
EP20050012679 |
申请日期 |
2005.06.13 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
SANO, KOUSEI;KOMMA, YOSHIAKI;MIZUNO, SADAO |
分类号 |
G11B7/13;G11B7/135 |
主分类号 |
G11B7/13 |
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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