公开(公告)号：US4835756A

公开(公告)日：1989-05-30

申请号：US32506

申请日：1987-03-31

申请人： Toshimitsu Kaku ,  Takeshi Maeda ,  Shigeru Nakamura ,  Masaru Ito ,  Kazuo Shigematsu ,  Yoshito Tsunoda

发明人： Toshimitsu Kaku ,  Takeshi Maeda ,  Shigeru Nakamura ,  Masaru Ito ,  Kazuo Shigematsu ,  Yoshito Tsunoda

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/24

CPC分类号： G11B7/0938 ,  G11B7/08505 ,  G11B7/24079 ,  G11B7/24076

摘要： An optical memory apparatus employs an optical disc having a plurality of guide-grooves in spiral and concentrical form and a plurality of flat tracks each arranged between adjacent two of the guide-grooves for recording information thereon, and the depth of the guide-grooves is suitably selected to increase the degree of modulation of a track cross signal, thereby performing a stable cross track counting by the use of the track cross signal and a tracking signal. One feature of the invention relies in that the modulation degree of the track cross signal is in the range between 30 and 60%. A second feature of the invention is that the guide-grooves are formed into a V shape and have an optical depth of .lambda./6 to .lambda./5 (.lambda. is the wavelength of the light used). In accordance with the invention, not ony a stable cross track counting is realized, but also the tracking signal is not practically varied with variations in the depth of the guide-grooves, thereby ensuring a highly accurate and stable tracking control.

摘要翻译： 一种光存储装置采用具有多个螺旋形和同心形状的导向槽的光盘，以及多个平行轨道，每个平行轨迹布置在相邻的两个导槽之间，用于在其上记录信息，并且导向槽的深度为 适当地选择以增加轨道交叉信号的调制度，从而通过使用轨道交叉信号和跟踪信号执行稳定的交叉轨道计数。 本发明的一个特征在于，轨道交叉信号的调制度在30％与60％之间。 本发明的第二个特征是导槽形成为V形，并且具有λ/ 6至λ/ 5的光学深度（λ是所用光的波长）。 根据本发明，不能实现稳定的交叉轨道计数，而且跟踪信号实际上不随着导槽深度的变化而变化，从而确保高精度和稳定的跟踪控制。

公开(公告)号：US4725721A

公开(公告)日：1988-02-16

申请号：US766271

申请日：1985-08-16

申请人： Shigeru Nakamura ,  Yoshito Tsunoda ,  Takeshi Maeda

发明人： Shigeru Nakamura ,  Yoshito Tsunoda ,  Takeshi Maeda

IPC分类号： G02B7/28 ,  G11B7/085 ,  G11B7/09 ,  G11B7/135 ,  G11B7/1374 ,  G11B7/1381

CPC分类号： G11B7/1381 ,  G11B7/08547 ,  G11B7/0908 ,  G11B7/0916 ,  G11B7/1374

摘要： An autofocusing control system makes a position of focusing spot follow for itself a displacement of an information medium. In the autofocusing control system, a single mode semiconductor laser is excited in a multi oscillation mode by returning part of a reflected light beam from the information medium, and a focusing lens having chromatic aberration is used which focuses a laser beam from the semiconductor laser onto a different position along the optical axis of the lens in association with a different laser wavelength.

摘要翻译： 自动对焦控制系统使得聚焦点的位置本身跟随信息介质的位移。 在自动对焦控制系统中，通过使来自信息介质的一部分反射光束返回到多重振荡模式中，单模半导体激光器被激发，并且使用具有色差的聚焦透镜，其将来自半导体激光器的激光束聚焦到 与不同激光波长相关联的沿着透镜的光轴的不同位置。

公开(公告)号：US4949331A

公开(公告)日：1990-08-14

申请号：US875442

申请日：1986-06-17

申请人： Takeshi Maeda ,  Yoshito Tsunoda ,  Kazuo Shigematsu ,  Toshimitsu Kaku

发明人： Takeshi Maeda ,  Yoshito Tsunoda ,  Kazuo Shigematsu ,  Toshimitsu Kaku

IPC分类号： G11B7/007 ,  G11B7/09 ,  G11B7/26 ,  G11B11/105

CPC分类号： G11B7/261 ,  G11B11/10565 ,  G11B11/10578 ,  G11B11/10582 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/094 ,  G11B7/24082

摘要： A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of the record carrier so that a plurality of revolutions of the guide groove are spaced apart from each other in radial directions of the record carrier, and a pit pattern provided between adjacent guide grooves, at positions arranged at intervals in the above rotational direction, for detecting the deviation of a light spot from the center line between adjacent guide grooves. The recording/reproducing operation for this record carrier is performed in such a manner that the first tracking error signal is detected from diffracted light from the guide groove, the second tracking error signal is detected from the pit pattern, and information is recorded in and reproduced from a land formed between adjacent guide grooves in a state that a tracking operation is performed using the first and second tracking error signals. The second tracking error signal detected from the pit pattern is not affected by the tilting of the record carrier and the movement of the light spot. When a tracking signal obtained by adding the first and second tracking error signals to each other, is used in a closed-loop tracking system, a stable tracking operation can be performed. The polarity of the pit pattern is reversed on every track, and hence a polarity pit having a depth of .lambda./4 (where .lambda. indicates the wavelength of a reproducing light beam) is provided in the record carrier, to reverse the polarity of the second tracking signal on every track on the basis of a signal from the polarity pit.

摘要翻译： 公开了一种具有盘形基板和用于在其中光学地写入信息的记录层的记录载体，其包括沿着记录载体的旋转方向延伸的引导槽，使得引导槽的多个转动彼此间隔开 在记录载体的径向方向上设置的凹坑图案，以及设置在相邻引导槽之间的位置，在沿上述旋转方向间隔设置的位置处，用于检测光点与相邻引导槽之间的中心线的偏离。 该记录载体的记录/再现操作以从导槽的衍射光检测第一跟踪误差信号，从凹坑图案检测第二跟踪误差信号并将信息记录并再现 在使用第一和第二跟踪误差信号执行跟踪操作的状态下从形成在相邻引导槽之间的区域。 从凹坑图案检测到的第二跟踪误差信号不受记录载体的倾斜和光点的移动的影响。 当在闭环跟踪系统中使用通过将第一和第二跟踪误差信号彼此相加而获得的跟踪信号时，可以执行稳定的跟踪操作。 凹坑图案的极性在每个轨道上反转，因此在记录载体中提供具有λ/ 4深度（其中λ表示再现光束的波长）的极性凹坑，以反转第二 基于来自极性凹坑的信号在每个轨道上跟踪信号。

公开(公告)号：US4802153A

公开(公告)日：1989-01-31

申请号：US842200

申请日：1986-03-21

申请人： Keiji Kataoka ,  Takeshi Maeda ,  Yoshito Tsunoda

发明人： Keiji Kataoka ,  Takeshi Maeda ,  Yoshito Tsunoda

IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/12

CPC分类号： G11B7/08558 ,  G11B7/08511 ,  G11B7/08552 ,  G11B7/1245

摘要： Accessing method and an apparatus therefor in an optical disc apparatus having an acousto-optic light deflector for deflecting a light spot to a different address or different track on an optical disc are disclosed. An auto-focus signal is held at a constant level for a predetermined period when the acousto-optic light deflector deflects the light spot. Thus, an affect caused by coexistence of a plurality of acoustic frequencies in the acoustic-optic device is eliminated and fast light accessing is attained.

摘要翻译： 公开了具有用于将光点偏转到光盘上的不同地址或不同轨道的声光偏转器的光盘装置中的访问方法及其装置。 当声光偏转器偏转光斑时，自动对焦信号被保持在一定的时间段上。 因此，消除了在声光装置中多个声频共存引起的影响，并且实现了快速的光访问。

公开(公告)号：US4742218A

公开(公告)日：1988-05-03

申请号：US828354

申请日：1986-02-11

申请人： Shigeru Nakamura ,  Toshimasa Kamisada ,  Akira Saito ,  Takeshi Maeda ,  Yoshito Tsunoda ,  Toshimitsu Kaku ,  Tuyoshi Kato ,  Masaaki Hishiki ,  Masateru Watanabe

发明人： Shigeru Nakamura ,  Toshimasa Kamisada ,  Akira Saito ,  Takeshi Maeda ,  Yoshito Tsunoda ,  Toshimitsu Kaku ,  Tuyoshi Kato ,  Masaaki Hishiki ,  Masateru Watanabe

IPC分类号： G11B7/09 ,  G11B11/105 ,  G01J1/20 ,  G11B5/09

CPC分类号： G11B7/0912 ,  G11B11/10541 ,  G11B11/10576

摘要： A focus error detection apparatus and an optical disk apparatus comprising a focusing lens for focusing reflected light coming from a light reflecting surface which is to be adjusted at the focal point of a projected light beam; a beam splitter means for dividing the output light of said focusing lens into a first and a second focused light beam; a first and a second photo-detector disposed respectively on the optical paths of said first and said second focused light beam, one of which is located behind the convergence point of said first focused light beam and the other of which is located before the convergence point of said second focused light beam, each of them generating outputs proportional to the amount of light within a predetermined region of the received light image, when it varies so that it is enlarged; and a circuit generating a focus error signal by using the difference between the outputs of said two photo-detectors.

摘要翻译： 一种聚焦误差检测装置和光盘装置，包括：聚焦透镜，用于聚焦来自被投影光束的焦点处被调节的光反射表面的反射光; 分束器装置，用于将所述聚焦透镜的输出光分成第一和第二聚焦光束; 分别设置在所述第一和第二聚焦光束的光路上的第一和第二光电检测器，其中一个位于所述第一聚焦光束的会聚点之后，另一个位于会聚点之前 所述第二聚焦光束中的每一个产生与所接收的光图像的预定区域内的光量成比例的输出，当其变化使得其被放大时; 以及通过使用所述两个光电检测器的输出之间的差产生聚焦误差信号的电路。

公开(公告)号：US4450547A

公开(公告)日：1984-05-22

申请号：US313218

申请日：1981-10-20

申请人： Shigeru Nakamura ,  Takeshi Maeda ,  Toshimitsu Kaku ,  Yoshito Tsunoda ,  Wasao Takasugi ,  Tokuya Kaneda

发明人： Shigeru Nakamura ,  Takeshi Maeda ,  Toshimitsu Kaku ,  Yoshito Tsunoda ,  Wasao Takasugi ,  Tokuya Kaneda

IPC分类号： G02B7/28 ,  G02B27/40 ,  G11B7/09 ,  G11B7/135 ,  G11B7/1381 ,  G11B7/22 ,  G11B7/00

CPC分类号： G11B7/1381 ,  G02B27/40 ,  G11B7/0908 ,  G11B7/0916 ,  G11B7/22

摘要： A focal position detecting optical apparatus wherein a light beam focused by a first optical system is irradiated on an object to be illuminated, focal point images are formed at two foci spaced apart from each other by a cylindrical lens disposed in a path of light beam reflected from the object, and a shielding element having a tip edge making an angle of approximately 45.degree. with an operating axis of the cylindrical lens is inserted at a site between the two foci and at which the light beam has a circular cross section to extract a portion of the light beam travelling between the two foci. The extracted portion is detected by two photodetectors disposed symmetrically with an axis lying in substantially the same direction as the tip edge, and the difference between outputs of the two photodetectors is produced for detection of an actual focal position of the first optical system.

摘要翻译： 一种焦点位置检测光学装置，其中由第一光学系统聚焦的光束照射在待照射的物体上，焦点图像通过设置在反射光束的路径中的柱面透镜彼此间隔开地形成在两个焦点处 并且具有与柱面透镜的操作轴线成约45度的尖端边缘的屏蔽元件插入在两个焦点之间的位置处，并且光束具有圆形横截面以提取 光束在两个焦点之间行进的部分。 提取部分由两个光电检测器检测，两个光电检测器以与尖端边缘基本相同的轴线对称布置，并且产生两个光电检测器的输出之间的差异，用于检测第一光学系统的实际焦点位置。

公开(公告)号：US4085423A

公开(公告)日：1978-04-18

申请号：US691099

申请日：1976-05-28

申请人： Yoshito Tsunoda ,  Takeshi Maeda ,  Yoshitada Oshida

发明人： Yoshito Tsunoda ,  Takeshi Maeda ,  Yoshitada Oshida

IPC分类号： H04N5/85 ,  G02B27/00 ,  G02B27/09 ,  G11B7/00 ,  G11B7/005 ,  G11B7/09 ,  G11B7/12

CPC分类号： G11B7/0903 ,  G11B7/12

摘要： Information reproducing apparatus for producing information on an optical information recording medium includes a first light source which gives forth a beam of light of a wavelength .lambda..sub.1 and a second light source which gives forth a beam of light of a wavelength .lambda..sub.2 different from the wavelength .lambda..sub.1. An optical element selectively reflects the light of the wavelength .lambda..sub.1 and selectively transmits the light of the wavelength .lambda..sub.2. The first and second light sources, the optical element and the recording medium are positionally arranged so that the light beams from the first and second light sources may be projected on a predetermined position of the recording medium and a substantially identical position to the predetermined position through the optical element, respectively, and the arrangement of these elements is also such that the respective projected light beams may fall on the optical element after being reflected by the recording medium. First and second photodetectors detect light reflected from the optical element and light transmitted light through the same in accordance with the wavelength of the light beams falling on the optical element, respectively, and develop focusing and tracking control signals.

摘要翻译： 用于在光学信息记录介质上产生信息的信息再现装置包括：发出波长为λ1的光束的第一光源和产生波长为λ2的不同波长的光束的第二光源 光学元件选择性地反射波长λ1的光并选择性地透射波长λ2的光。第一和第二光源，光学元件和记录介质被位置地布置成使得来自 第一和第二光源可以分别投影在记录介质的预定位置上，并且通过光学元件分别与预定位置基本相同的位置，并且这些元件的布置也使得各个投影光束可能落在 被记录介质反射后的光学元件。 第一和第二光电检测器分别检测从光学元件反射的光并根据分别落在光学元件上的光束的波长来透过光，并且形成聚焦和跟踪控制信号。

公开(公告)号：US4554652A

公开(公告)日：1985-11-19

申请号：US490165

申请日：1983-04-29

申请人： Takeshi Maeda ,  Yoshito Tsunoda ,  Takakazu Huno ,  Masahiro Takasago ,  Yasumitsu Mizoguchi

发明人： Takeshi Maeda ,  Yoshito Tsunoda ,  Takakazu Huno ,  Masahiro Takasago ,  Yasumitsu Mizoguchi

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/09 ,  G11B7/125 ,  G11B19/04 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/36

CPC分类号： G11B27/36 ,  G11B19/04 ,  G11B20/10 ,  G11B20/1217 ,  G11B20/18 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/125 ,  G11B2220/2537

摘要： An optical information processor records predetermined information along a track on a recording medium through the irradiation of a light beam intensity-modulated in accordance with the predetermined information. A tracking signal obtained when the light beam traces the track, is compared with first and second preset values which define a predetermined range. When the tracking signal departs from the predetermined range, the intensity modulation of the light beam or the recording operation is stopped, thereby preventing data destruction which otherwise occurs due to the digression of the light beam from the track.

摘要翻译： 光学信息处理器通过照射根据预定信息强度调制的光束，沿着记录介质上的轨道记录预定信息。 当光束跟踪轨道时获得的跟踪信号与限定预定范围的第一和第二预设值进行比较。 当跟踪信号偏离预定范围时，光束的强度调制或记录操作停止，从而防止由于来自轨迹的光束的分离而出现的数据破坏。

公开(公告)号：US4532522A

公开(公告)日：1985-07-30

申请号：US408678

申请日：1982-08-16

申请人： Yoshito Tsunoda ,  Takeshi Maeda ,  Shigeru Nakamura ,  Toshimitsu Kaku

发明人： Yoshito Tsunoda ,  Takeshi Maeda ,  Shigeru Nakamura ,  Toshimitsu Kaku

IPC分类号： G02B27/42 ,  G11B7/00 ,  G11B7/004 ,  G11B7/08 ,  G11B7/09 ,  G11B7/095 ,  G11B7/125 ,  G11B21/10

CPC分类号： G11B7/09 ,  G11B7/0903 ,  G11B7/125

摘要： An optical recording apparatus wherein in front and rear of a first light spot for recording predetermined information along a guide groove provided in a recording medium beforehand, two second light spots and two third light spots are arranged along the guide groove and in a manner to mutually deviate from the center of the guide groove; the second light spots are arranged in an area with no information recorded therein, while the third light spots are arranged in an area with the information recorded therein; and the position of the first light spot is controlled on the basis of the difference between the quantities of light of the second light spots and the difference between the quantities of light of the third light spots, so as to track the information.

摘要翻译： 一种光学记录装置，其特征在于，在预先在设置于记录介质中的引导槽记录预定信息的第一光点的前方和后方，沿引导槽配置两个第二光点和两个第三光点， 偏离导槽的中心; 第二光点被布置在没有记录信息的区域中，而第三光点被布置在其中记录有信息的区域中; 并且基于第二光点的光量与第三光点的光量之差的差来控制第一光点的位置，以便跟踪信息。

公开(公告)号：US4525826A

公开(公告)日：1985-06-25

申请号：US402234

申请日：1982-07-27

申请人： Shigeru Nakamura ,  Yoshito Tsunoda ,  Kazuo Shigematsu ,  Toshimitsu Kaku ,  Takeshi Maeda ,  Tsuyoshi Kato

发明人： Shigeru Nakamura ,  Yoshito Tsunoda ,  Kazuo Shigematsu ,  Toshimitsu Kaku ,  Takeshi Maeda ,  Tsuyoshi Kato

IPC分类号： G01B11/00 ,  G11B7/09 ,  G11B7/095 ,  G11B7/12 ,  G11B7/13 ,  G11B7/00

CPC分类号： G11B7/0901 ,  G11B7/09 ,  G11B7/0953 ,  G11B7/12 ,  G11B7/13

摘要： In an optical information processor such as an optical disc apparatus, when a light beam is irradiated to a plurality of tracks on an information recording medium, the plurality of tracks act as a diffraction grating. Areas in which light receiving parts of a light detector are arranged are determined by a track pitch, a wavelength and a numerical aperture of a condenser lens so that the light detector detects only a change in a light intensity due to an interference between a 0-order diffracted light ray and a 1-order diffracted light ray.

摘要翻译： 在诸如光盘装置的光学信息处理器中，当光束照射到信息记录介质上的多个轨道时，多个轨道用作衍射光栅。 通过光圈间距，聚光透镜的波长和数值孔径确定其中布置有光检测器的光接收部分的区域，使得光检测器仅检测由于0- 1级衍射光线和1级衍射光线。