发明申请
US20120224462A1 PICKUP HEAD, INFORMATION RECORDING METHOD AND REPRODUCING METHOD 失效
PICKUP头,信息记录方法和再现方法

PICKUP HEAD, INFORMATION RECORDING METHOD AND REPRODUCING METHOD
摘要:
According to one embodiment, a pickup head includes a plurality of light sources, a first objective lens, second objective lens, a driving unit, a first control unit, a second control unit, light receiving units. The first objective lens focuses a first light beam at a first recording layer. The second objective lens focuses a second light beam at a second recording layer. The driving unit moves the first objective lens and the second objective lens in a first direction and a second direction. The first control unit corrects displacement from target track along the first direction. The second control unit controls a moving direction of a position of the second light spot in the second direction.
信息查询
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