Information reproducing apparatus for optical disc
    6.
    发明授权
    Information reproducing apparatus for optical disc 失效
    用于光盘的信息再现装置

    公开(公告)号:US5768232A

    公开(公告)日:1998-06-16

    申请号:US868623

    申请日:1997-06-04

    摘要: An information reproducing apparatus for reproducing information recorded on an information track formed on an information record surface of an optical disc, is provided with: a light irradiation device for irradiating the information record surface with a plurality of light beams including a first light beam, to which a coma aberration is not given, and at least one second light beam, to which a predetermined coma aberration for cancelling a coma aberration due to a tilt of the information record surface in a direction perpendicular to the information track is given, such that the first light beam and the second light beam form light spots arranged along the information track; a first photo-detector for detecting a first reflection light from the information record surface and generating a first light detection signal; a second photo-detector for detecting a second reflection light from the information record surface and generating a second light detection signal; a tilt detection device for detecting a tilt of the information record surface and outputting a tilt signal; and a selection device for selecting one of the first and second light detection signals which has a less coma aberration according to the tilt signal. The information is reproduced on the basis of the selected one of the first and second light detection signals.

    摘要翻译: 一种用于再现记录在形成在光盘的信息记录表面上的信息轨迹上的信息的信息再现装置设置有:用于将包括第一光束的多个光束照射到信息记录表面的光照射装置, 并且给出了至少一个第二光束,其中给出了用于消除由于信息记录表面在与信息轨迹垂直的方向上的倾斜引起的彗形像差的预定彗形像差,使得 第一光束和第二光束形成沿着信息轨迹布置的光点; 第一光检测器,用于检测来自信息记录表面的第一反射光并产生第一光检测信号; 第二光检测器,用于检测来自信息记录表面的第二反射光并产生第二光检测信号; 倾斜检测装置,用于检测信息记录表面的倾斜并输出倾斜信号; 以及选择装置,用于根据倾斜信号选择具有较小彗形像差的第一和第二光检测信号之一。 基于所选择的第一和第二光检测信号之一再现信息。

    Information reproducing apparatus for optical disc having a tilt
detector therein
    7.
    发明授权
    Information reproducing apparatus for optical disc having a tilt detector therein 失效
    用于其中具有倾斜检测器的光盘的信息再现装置

    公开(公告)号:US5675564A

    公开(公告)日:1997-10-07

    申请号:US595073

    申请日:1996-02-01

    摘要: An information reproducing apparatus for reproducing information recorded on an information track formed on an information record surface of an optical disc, is provided with: a light irradiation device for irradiating the information record surface with a plurality of light beams including a first light beam, to which a coma aberration is not given, and at least one second light beam, to which a predetermined coma aberration for cancelling a coma aberration due to a tilt of the information record surface in a direction perpendicular to the information track is given, such that the first light beam and the second light beam form light spots arranged along the information track; a first photo-detector for detecting a first reflection light from the information record surface and generating a first light detection signal; a second photo-detector for detecting a second reflection light from the information record surface and generating a second light detection signal; a tilt detection device for detecting a tilt of the information record surface and outputting a tilt signal; and a selection device for selecting one of the first and second light detection signals which has a less coma aberration according to the tilt signal. The information is reproduced on the basis of the selected one of the first and second light detection signals.

    摘要翻译: 一种用于再现记录在形成在光盘的信息记录表面上的信息轨迹上的信息的信息再现装置设置有:用于将包括第一光束的多个光束照射到信息记录表面的光照射装置, 并且给出了至少一个第二光束,其中给出了用于消除由于信息记录表面在与信息轨迹垂直的方向上的倾斜引起的彗形像差的预定彗形像差,使得 第一光束和第二光束形成沿着信息轨迹布置的光点; 第一光检测器,用于检测来自信息记录表面的第一反射光并产生第一光检测信号; 第二光检测器,用于检测来自信息记录表面的第二反射光并产生第二光检测信号; 倾斜检测装置,用于检测信息记录表面的倾斜并输出倾斜信号; 以及选择装置,用于根据倾斜信号选择具有较小彗形像差的第一和第二光检测信号之一。 基于所选择的第一和第二光检测信号之一再现信息。

    Tracking error signal generation device
    8.
    发明授权
    Tracking error signal generation device 失效
    跟踪误差信号发生装置

    公开(公告)号:US5708636A

    公开(公告)日:1998-01-13

    申请号:US655753

    申请日:1996-05-30

    摘要: A tracking error signal generation device is used for an optical pickup device capable of reproducing and/or recording an information signal on a spiral or coaxial signal track of a disk shaped optical record medium of one type among a plurality of optical record media of different types which track pitches are different from each other. The optical pickup device has a light beam irradiation device for irradiating the optical record medium with three light beams; and light detection devices for receiving a reflection light of each light beam. The tracking error signal generation device is provided with: a first operation device for calculating a first tracking error signal according to the three beams method; a second operation device for calculating a second tracking error signal according to a DPP (Differential Push Pull) method; and a selecting device for selecting one of the first tracking error signal and the second tracking error signal on the basis of an instruction from the external.

    摘要翻译: 跟踪误差信号产生装置用于能够在不同类型的多个光学记录介质中的一种类型的盘形光学记录介质的螺旋或同轴信号轨道上再现和/或记录信息信号的光学拾取装置 哪些轨道间距彼此不同。 该光学拾取装置具有光束照射装置,用于用三个光束照射光学记录介质; 以及用于接收每个光束的反射光的光检测装置。 跟踪误差信号发生装置具有:根据三波束法计算第一跟踪误差信号的第一操作装置; 第二操作装置,用于根据DPP(差分推挽)方法计算第二跟踪误差信号; 以及选择装置,用于基于来自外部的指令来选择第一跟踪误差信号和第二跟踪误差信号中的一个。