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    • 8. 发明授权
    • Focus servo controlling apparatus, information reproducing apparatus and information recording apparatus
    • 聚焦伺服控制装置,信息再现装置和信息记录装置
    • US06731574B1
    • 2004-05-04
    • US09684798
    • 2000-10-10
    • Shinichiro AbeTakayuki Iijima
    • Shinichiro AbeTakayuki Iijima
    • G11B700
    • G11B7/0945G11B7/0946G11B11/10576G11B11/10597
    • A focus servo control is performed by changing a condition of a focus servo loop from an open condition to a close condition in correspondence with a level of a reflection light signal, which is obtained as a reflection light of a light beam reflected from an information record medium is detected by a light receiving element such as an optical pickup. A focus servo controlling apparatus is provided with a disturbance level detecting device such as a servo control circuit for detecting a level of a disturbance light signal, which is obtained as a disturbance light other than the reflection light is received by the light receiving element; and a controlling device such as a system controller for setting a level, which is larger than the level of the disturbance light signal detected by the disturbance level detecting device, as a threshold level and for changing the condition of the focus servo loop from the open condition to the close condition on the basis of a timing when the level of the reflection light signal becomes equal to or larger than the set threshold level.
    • 通过将聚焦伺服环路的条件从打开状态改变为接近状态,与反射光信号的电平相对应地进行聚焦伺服控制,反射光信号的电平作为从信息记录反射的光束的反射光获得 介质由诸如光学拾取器的光接收元件检测。 聚焦伺服控制装置设置有干扰电平检测装置,例如用于检测干扰光信号的电平的伺服控制电路,该干扰光信号的电平是由光接收元件接收的除了反射光之外的干扰光获得的; 以及诸如系统控制器的控制装置,用于将大于由干扰电平检测装置检测的干扰光信号的电平的电平设置为阈值电平,并且用于将聚焦伺服环路的状态从开路 基于反射光信号的电平变得等于或大于设定的阈值电平的定时,使其处于关闭状态。