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    • 1. 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。
    • 9. 发明授权
    • Apparatus for reproducing information
    • 用于再现信息的装置
    • US06801489B2
    • 2004-10-05
    • US10052568
    • 2002-01-23
    • Shinichiro AbeTakayuki Iijima
    • Shinichiro AbeTakayuki Iijima
    • G11B509
    • G11B19/28G11B19/02G11B20/00007G11B20/10
    • An information reproducing apparatus in which the compressed information read from a disc is written to the memory, the written compressed information is read out in the order of writing and is supplied to an expansion device to obtain reproduced information. Writing of the compressed information to the memory is stopped when the amount of compressed information written to the memory increases to a first predetermined amount and writing of the compressed information to the memory is restarted when the amount of compressed information written decreases to a second predetermined amount which is smaller than the first predetermined amount and which is an amount corresponding to the compression ratio of the compressed information. The rotation speed of a spindle motor during a writing interruption period is lower than that during a writing period.
    • 一种信息再现装置,其中从盘读取的压缩信息被写入存储器,写入的压缩信息以写入的顺序被读出,并被提供给扩展装置以获得再现的信息。 当写入存储器的压缩信息量增加到第一预定量时,将压缩信息写入存储器就停止,并且当压缩信息写入量减少到第二预定量时,重新开始将压缩信息写入存储器 其小于第一预定量,并且其是对应于压缩信息的压缩比的量。 在写入中断期间主轴电动机的转速低于写入期间的转速。