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Focusing control apparatus using dynamic target value in relation to land/groove
Focusing control apparatus using dynamic target value in relation to land/groove
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机译:使用相对于地面/沟槽的动态目标值的聚焦控制装置
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摘要
A focusing control apparatus is provided for controlling focusing of a light beam on a recording medium. The apparatus includes a control mechanism for maintaining the focusing state of the light beam on the recording medium by moving a focus mechanism based on a comparison between an output signal indicative of the focusing state and a target value. The apparatus further includes a target value setting circuit for setting the target value at a first level when the light beam is irradiated on the land track portions of the recording medium; and for setting the target value at a second level when the light beam is irradiated on the groove track portions.
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