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    Wavelength scanning interferometry and interferometer employing laser diode
    1.
    发明授权
    Wavelength scanning interferometry and interferometer employing laser diode 失效
    采用激光二极管的波长扫描干涉仪和干涉仪

    公开(公告)号：US4759628A

    公开(公告)日：1988-07-26

    申请号：US826341

    申请日：1986-02-05

    申请人： Kimio Tatsuno ,  Yoshito Tsunoda ,  Masatoshi Ohtake ,  Keiji Kataoka ,  Seiji Yonezawa

    发明人： Kimio Tatsuno ,  Yoshito Tsunoda ,  Masatoshi Ohtake ,  Keiji Kataoka ,  Seiji Yonezawa

    IPC分类号： G01J9/02 ,  G01B9/02 ,  G01J3/45 ,  G01J9/04

    CPC分类号： G01J9/04 ,  G01J3/45

    摘要： In an interferometry wherein a light beam from a light source is divided in two, one of which is used as a reference beam and the other beam is used as an inspecting beam, and the two beams are projected again on an identical plane so as to form an interference pattern; a wavelength scanning type laser diode interferometry characterized in that a laser diode is employed as the light source, and that an injection current of the laser diode is modulated thereby to scan a wavelength of the laser diode and to change an intensity distribution of the interference pattern.

    摘要翻译： 在其中来自光源的光束被分成两部分的干涉测量中，其中一个用作参考光束，另一个光束用作检查光束，并且两个光束再次投射在相同的平面上，以便 形成干扰模式; 波长扫描型激光二极管干涉测量法，其特征在于使用激光二极管作为光源，并且调制激光二极管的注入电流，从而扫描激光二极管的波长并改变干涉图案的强度分布 。

    Method and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offset
    2.
    发明授权
    Method and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offset 失效
    具有轨道偏移校正和旋转光盘的复合跟踪伺服系统的方法和装置，其具有用于校正轨道偏移的至少一个校正标记

    公开(公告)号：US4748609A

    公开(公告)日：1988-05-31

    申请号：US845340

    申请日：1986-03-28

    申请人： Seiji Yonezawa ,  Masatoshi Ohtake ,  Masaru Ito ,  Toshiaki Tsuyoshi ,  Kazuo Ichino ,  Harushige Nakagaki

    发明人： Seiji Yonezawa ,  Masatoshi Ohtake ,  Masaru Ito ,  Toshiaki Tsuyoshi ,  Kazuo Ichino ,  Harushige Nakagaki

    IPC分类号： G11B7/013 ,  G11B7/09 ,  G11B7/095 ,  G11B7/24

    CPC分类号： G11B7/24085 ,  G11B7/094 ,  G11B7/0948 ,  G11B7/0956 ,  G11B7/0901 ,  G11B7/0904

    摘要： A composite wobbled tracking servo system uses a rotary optical disc which has a header field and a data field alternately arranged along the direction of rotation to provide a sector, and which includes pregrooves formed in at least the data field and at least one pair of wobbled track marks disposed in the header field in a relation wobbled relative to the center of a track. A light spot is directed toward and onto the optical disc to detect a push-pull tracking error signal from the reflection of the light spot diffracted by the pregroove, and a wobbled tracking error signal is detected from the reflection of the light spot traversing the wobbled track marks. The push-pull tracking error signal is corrected on the basis of the wobbled tracking error signal to attain the tracking control with higher accuracy, thereby eliminating an undesirable track offset attributable to tilting or eccentricity of the optical disc.

    摘要翻译： 复合摆动跟踪伺服系统使用旋转光盘，其具有沿着旋转方向交替布置的报头字段和数据字段以提供扇区，并且其包括形成在至少数据字段中的预槽和至少一对摆动的 轨道标记以相对于轨道的中心摆动的关系设置在头部区域中。 光点指向光盘，以从由预制槽衍射的光点的反射检测推挽跟踪误差信号，并且从穿过波动的光点的反射中检测摆动的跟踪误差信号 轨迹 基于摆动的跟踪误差信号校正推挽跟踪误差信号，以更高的精度实现跟踪控制，从而消除由于光盘的倾斜或偏心引起的不期望的轨迹偏移。

    Method and apparatus for composite wobbled and push-pull tracking servo system
    4.
    发明授权
    Method and apparatus for composite wobbled and push-pull tracking servo system 失效
    复合摆动和推挽跟踪伺服系统的方法和装置

    公开(公告)号：US4707816A

    公开(公告)日：1987-11-17

    申请号：US938961

    申请日：1986-12-08

    申请人： Seiji Yonezawa ,  Masatoshi Ohtake ,  Masaru Ito ,  Toshiaki Tsuyoshi ,  Kazuo Ichino ,  Harushige Nakagaki

    发明人： Seiji Yonezawa ,  Masatoshi Ohtake ,  Masaru Ito ,  Toshiaki Tsuyoshi ,  Kazuo Ichino ,  Harushige Nakagaki

    IPC分类号： G11B7/013 ,  G11B7/09 ,  G11B7/095

    CPC分类号： G11B7/0956 ,  G11B7/0904 ,  G11B7/0938 ,  G11B7/094 ,  G11B7/0948 ,  G11B7/24085 ,  G11B7/0901

    摘要： A composite wobbled tracking servo system uses a rotary optical disc which has a header field and a data field alternately arranged along the direction of rotation, and which includes pregrooves formed in at least the data field and at least one pair of wobbled track marks disposed in each of the header fields in a relation wobbled relative to the center of a track. A light spot is directed toward and onto the optical disc to detect a push-pull tracking error signal from the reflection of the light spot diffracted from the pregroove, and a wobbled tracking error signal is detected from the reflection of the light spot passing the wobbled track marks. After attenuating the gain of the wobbled tracking error signal by a low-pass filter so that the gain of the wobbled tracking error signal becomes equal to that of the push-pull tracking error signal at a frequency fe satisfying the relation1/50.multidot.N.multidot.fd

    摘要翻译： 复合摆动跟踪伺服系统使用旋转光盘，该旋转光盘具有沿着旋转方向交替布置的头部场和数据场，并且包括形成在至少数据场中的预槽和至少一对摆动轨迹 一个关系中的每个头字段相对于轨道的中心摆动。 光点被指向光盘上并且到达光盘上以从从预制槽衍射的光点的反射中检测推挽跟踪误差信号，并且从通过摆动的光斑的光点的反射检测摆动的跟踪误差信号 轨迹 在通过低通滤波器对摆动跟踪误差信号的增益进行衰减之后，使摆动跟踪误差信号的增益等于推挽跟踪误差信号的频率fe满足关系1 / 50xNxfd

    Optical information recording and reproducing apparatus with tracking control by sampling
    5.
    发明授权
    Optical information recording and reproducing apparatus with tracking control by sampling 失效
    具有采样跟踪控制的光信息记录和再现设备

    公开(公告)号：US4847822A

    公开(公告)日：1989-07-11

    申请号：US71347

    申请日：1987-07-09

    申请人： Wasao Takasugi ,  Seiji Yonezawa ,  Toshiaki Tsuyoshi ,  Masatoshi Ohtake

    发明人： Wasao Takasugi ,  Seiji Yonezawa ,  Toshiaki Tsuyoshi ,  Masatoshi Ohtake

    IPC分类号： G11B7/09 ,  G11B7/095

    CPC分类号： G11B7/0938 ,  G11B7/0948

    摘要： An optical information recording and reproducing apparatus of a sampling servo system which effects the tracking by holding the differential output of the reproduced signals of tracking pits that are wobbled toward the right and left relative to the track of the optical disk. Reproduced signals of a plurality of pits arranged maintaining a distance on the track and wobbled toward the right or left in a servo signal region, are compared with each other to detect any abnormal condition in the tracking pits. When the abnormal condition is detected, the tracking signal that is sampled is not used, but instead the tracking signal sampled under the normal condition is continuously used to perform the tracking control.

    摘要翻译： 一种采样伺服系统的光学信息记录和再现装置，其通过保持相对于光盘的轨道向左右摆动的跟踪凹坑的再现信号的差分输出来实现跟踪。 将维持轨道上的距离并且在伺服信号区域中向左或向左摆动的多个坑的再现信号彼此进行比较，以检测跟踪凹坑中的任何异常状况。 当检测到异常情况时，不使用采样的跟踪信号，而是在正常条件下采样的跟踪信号被连续地用于执行跟踪控制。

    Light spot position control system and method by sampled servo
    7.
    发明授权
    Light spot position control system and method by sampled servo 失效
    光点位置控制系统及采样伺服方式

    公开(公告)号：US4872152A

    公开(公告)日：1989-10-03

    申请号：US131643

    申请日：1987-12-11

    申请人： Toshiaki Tsuyoshi ,  Masatoshi Ohtake ,  Wasao Takasugi ,  Seiji Yonezawa

    发明人： Toshiaki Tsuyoshi ,  Masatoshi Ohtake ,  Wasao Takasugi ,  Seiji Yonezawa

    IPC分类号： G02B7/28 ,  G11B7/09 ,  G11B21/10

    CPC分类号： G11B7/0906

    摘要： In a light spot position control system and method in which a control of the irradiation position of a light spot such as a focusing control, a jitter correction and/or a tracking control is made through a sampling control, a newly sampled error value is compared with a one-preceding sampled value. When a difference between both the values is within a range of a predetermined width, the newly sampled value is used as a new sample value as it is. When the difference exceeds the range of the predetermined width, a sum of the one-preceding sampled value and the predetermined width is used as a new sample value. Thereby, the influence of erroneous samples is reduced.

    摘要翻译： 在通过采样控制进行聚焦控制，抖动校正和/或跟踪控制等光点的照射位置的控制的光点位置控制系统和方法中，对新采样的误差值进行比较 具有一个先前的采样值。 当两个值之间的差在预定宽度的范围内时，新采样的值被原样用作新的采样值。 当差超过预定宽度的范围时，将一次取样值与预定宽度的和用作新的样本值。 从而减少错误样品的影响。

    Light spot position control system and method by sampling servo
    8.
    发明授权
    Light spot position control system and method by sampling servo 失效
    光点位置控制系统和采样伺服方法

    公开(公告)号：US4785442A

    公开(公告)日：1988-11-15

    申请号：US072095

    申请日：1987-07-10

    申请人： Masatoshi Ohtake ,  Seiji Yonezawa ,  Toshiaki Tsuyoshi ,  Wasao Takasugi ,  Takashi Takeuchi

    发明人： Masatoshi Ohtake ,  Seiji Yonezawa ,  Toshiaki Tsuyoshi ,  Wasao Takasugi ,  Takashi Takeuchi

    IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/095 ,  G11B7/00 ,  G11B21/10

    CPC分类号： G11B7/09

    摘要： A light spot position control system of the invention uses an optical disc in which a servo area and a data area are alternately formed along a rotating direction of a rotary recording medium, wherein error signals obtained from the servo areas are sampled, the latest sample value is compared with at least one-preceding sample value, a check is made to see if the latest sample value is correct or incorrect, and when the latest sample value is decided to be incorrect, the preceding error signal held is directly used as a light spot position control signal without updating the current error signal holding value.

    摘要翻译： 本发明的光点位置控制系统使用其中伺服区域和数据区域沿着旋转记录介质的旋转方向交替形成的光盘，其中从伺服区域获得的误差信号被采样，最新采样值 与至少一个以前的采样值进行比较，进行检查以查看最新采样值是否正确或不正确，并且当最新采样值被确定为不正确时，所保持的前一个误差信号直接用作光 点位置控制信号，而不更新当前误差信号保持值。