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    • 6. 发明授权
    • Carrier mechanism
    • 载体机制
    • US06970402B1
    • 2005-11-29
    • US09490113
    • 2000-01-24
    • Takao ShimamuraFumihiko NakamuraHideaki YoshimuraNobutaka Kawakita
    • Takao ShimamuraFumihiko NakamuraHideaki YoshimuraNobutaka Kawakita
    • G11B17/22G11B7/00G11B17/26G11B17/30
    • G11B17/30
    • There is provided a carrier mechanism which can move a carrier section 23 to a desired position with high accuracy. The carrier mechanism is comprised of the carrier section 23, a driving motor 18, and an actuator formed of a cam mechanism 13, 15 for transmitting a driving force of the driving motor 18 to the carrier section 23 to convey the same. When the carrier section 23 is moved upward with respect to the present position, the carrier section 23 is once moved (elevated) to a position in excess of a desired position, then moved downward from the exceeded position to the desired position. When the carrier section 23 is moved downward from the present position, the carrier section 23 is moved to the desired position without exceeding the desired position. By virtue of this operation, in both of the elevation and lowering of the carrier section 23, the carrier section 23 reaches the desired section by lowering thereto at its final stage of the movement. Further, the so-called actuator for driving the carrier section 23 is held in a predetermined direction, and therefore the carrier section 23 can be positioned to the desired position with high accuracy.
    • 提供了一种能够以高精度将载体部23移动到期望位置的载体机构。 载体机构包括载体部分23,驱动马达18和由凸轮机构13,15形成的致动器,用于将驱动马达18的驱动力传递到载体部分23以将其传送。 当托架部分23相对于当前位置向上移动时,托架部分23一度移动(升高)到超出期望位置的位置,然后从超出位置向下移动到期望位置。 当托架部分23从当前位置向下移动时,托架部分23移动到期望的位置而不超过期望的位置。 通过这种操作,在承载部分23的升高和降低两者中,承载部分23在其运动的最后阶段通过下降到达期望的部分。 此外,用于驱动承载部23的所谓的致动器被保持在预定方向上,因此承载部23可以高精度地定位到期望的位置。
    • 8. 发明授权
    • Apparatus for controlling bias amount of focus error signal
    • 用于控制聚焦误差信号偏置量的装置
    • US5751674A
    • 1998-05-12
    • US772265
    • 1996-12-23
    • Alex BradshawTakashi SasakiYoshifumi FujinoYoshimichi NishioTomoko MiyagawaMayumi TakahashiHideaki Yoshimura
    • Alex BradshawTakashi SasakiYoshifumi FujinoYoshimichi NishioTomoko MiyagawaMayumi TakahashiHideaki Yoshimura
    • G11B7/09
    • G11B7/0945G11B7/0909G11B7/094G11B7/0941
    • An optical information reproducing and/or recording system is provided with an optical system for irradiating a light beam to an information record surface of an information record medium and detecting the light beam reflected from the information record surface to output a light detection signal, an amplifying device for amplifying the light detection signal and generating a focus error signal which indicates an error of a focus point of the light beam with respect to the information record surface, and a feed back device for feeding back the focus error signal in the focus servo loop to change the focus point in accordance with a level of the focus error signal. An apparatus for controlling a bias amount of the focus error signal is provided with: a superimposing device for superimposing a disturbance signal to flutter the focus point with respect to the information record surface, onto the focus error signal; an error amount detecting device for detecting a focus error amount of the focus point, on the basis of the light detection signal outputted when the disturbance signal is superimposed; a parameter calculating device for calculating a gain parameter corresponding to an amplification factor of the amplifying device, and a sensitivity parameter corresponding to a detection sensitivity of the optical system; and a bias amount calculating device for calculating the bias amount.
    • 光学信息再现和/或记录系统设置有用于将光束照射到信息记录介质的信息记录表面并检测从信息记录表面反射的光束以输出光检测信号的光学系统,放大 用于放大光检测信号并产生指示光束相对于信息记录表面的焦点的误差的聚焦误差信号的装置,以及用于反馈聚焦伺服环路中的聚焦误差信号的反馈装置 根据聚焦误差信号的电平改变焦点。 一种用于控制聚焦误差信号的偏置量的装置设置有:叠加装置,用于将干扰信号叠加到相对于信息记录表面的聚焦点上,到聚焦误差信号上; 根据叠加了干扰信号时输出的光检测信号,检测焦点的聚焦误差量的误差量检测装置; 用于计算与放大装置的放大系数对应的增益参数的参数计算装置,以及对应于光学系统的检测灵敏度的灵敏度参数; 以及用于计算偏置量的偏置量计算装置。