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：US4656618A

公开(公告)日：1987-04-07

申请号：US639004

申请日：1984-08-09

申请人： Toshimitsu Kaku ,  Keiji Kataoka ,  Yoshito Tsunoda ,  Kazuo Shigematsu

发明人： Toshimitsu Kaku ,  Keiji Kataoka ,  Yoshito Tsunoda ,  Kazuo Shigematsu

IPC分类号： G11B7/004 ,  G11B7/09 ,  G11B7/12 ,  G11B7/125 ,  G11B27/36

CPC分类号： G11B27/36 ,  G11B7/004 ,  G11B7/12 ,  G11B7/128 ,  G11B7/0909

摘要： In an optical information recording and reproducing apparatus having a laser light source and an optical system so that a beam from the laser light source is irradiated through the optical system on an information recording medium to record and reproduce information, an accousto-optic modulator is disposed in the optical system for receiving the beam from the laser light source, and a modulation unit is provided which comprises an oscillator for generating a plurality of signals at different frequencies, a modulator for modulating the outputs of the oscillator and an adder for adding together the outputs of the modulator.

摘要翻译： 在具有激光光源和光学系统的光学信息记录和再现装置中，使得来自激光光源的光束通过光学系统照射在信息记录介质上以记录和再现信息，设置声光调制器 在用于从激光光源接收光束的光学系统中，提供了一种调制单元，其包括用于产生不同频率的多个信号的振荡器，用于调制振荡器的输出的调制器和用于将 调制器的输出。

公开(公告)号：US4021606A

公开(公告)日：1977-05-03

申请号：US562394

申请日：1975-03-27

申请人： Yasutsugu Takeda ,  Yoshito Tsunoda ,  Fumio Imagawa ,  Keiji Kataoka ,  Kimio Tatsuno

发明人： Yasutsugu Takeda ,  Yoshito Tsunoda ,  Fumio Imagawa ,  Keiji Kataoka ,  Kimio Tatsuno

IPC分类号： H04N5/91 ,  G03H1/00 ,  G03H1/04 ,  G03H1/22 ,  G03H1/26 ,  G11B7/00 ,  G11B7/0065 ,  H04N5/76 ,  H04N5/89 ,  G03H1/30 ,  H04N5/86

CPC分类号： G11B7/0065 ,  G03H1/30 ,  H04N5/7605 ,  H04N5/90 ,  G03H1/0236 ,  G03H1/16 ,  G03H2001/0204 ,  G03H2210/20 ,  G03H2230/10 ,  G03H2270/22

摘要： A hologram apparatus comprises a rotary plane with a plurality of holograms concentrically or spirally arranged thereon, a light emitting source, and at least one photodetector for reading out reconstructed images of the holograms. During rotation of the rotary plane, the optical path of a light beam from the light emitting source is controlled, whereby the reconstructed images from the respective holograms are focused on the photodetector in succession. Some or all of the holograms are substantially oblong, and the long side and the short side of each oblong extend radially about the axis of the rotary plane and substantially orthogonally to the radial direction respectively.

摘要翻译： 全息图装置包括具有同心或螺旋地布置在其上的多个全息图的旋转平面，发光源和用于读出全息图的重建图像的至少一个光电检测器。 在旋转平面的旋转期间，控制来自发光源的光束的光路，由此来自各个全息图的重建图像被连续地聚焦在光电检测器上。 一些或全部全息图基本上是长方形的，并且每个长方形的长边和短边分别围绕旋转平面的轴线径向延伸并且基本上与径向基本正交。

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 。

公开(公告)号：US5109374A

公开(公告)日：1992-04-28

申请号：US406519

申请日：1989-09-13

申请人： Yoshito Tsunoda ,  Hiroshi Yasuoka ,  Takeshi Maeda

发明人： Yoshito Tsunoda ,  Hiroshi Yasuoka ,  Takeshi Maeda

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/0025 ,  G11B7/09 ,  G11B7/24 ,  G11B11/105

CPC分类号： G11B11/10584 ,  G11B11/10552 ,  G11B11/10556 ,  G11B11/10576 ,  G11B7/0025 ,  G11B7/24 ,  G11B7/24003

摘要： An optical memory device includes a cylindrically-shaped optical information recording medium and at least one optical head disposed around the information recording medium for irradiating the information recording medium with a light spot for recording or reproduction of information. The optical head has light spot moving means incorporated therein for the irradiation position of the light spot. The recording or reproduction of information is achieved by causing the light spot moving means to perform tracking control so that the light spot follows a desired track in an area within a range of movement of the light spot by the light spot moving means (or an infromation recording zone) in a state in which the relative positional relationship between the optical head and the cylindrically-shaped information recording medium in the direction parallel to the direction of the rotation axis of the information recording medium is fixed, with the optical head being not moved. The device can be constructed so that the position of either the optical head or the cylindrically-shaped information recording medium relative to the other in the direction parallel to the direction of the rotation axis of the information recording medium is mechanically moved, thereby making it possible to cahnge the information recording zone in the range of movement of the light spot by the light spot moving means to another information recording zone.

公开(公告)号：US5084860A

公开(公告)日：1992-01-28

申请号：US551025

申请日：1990-07-11

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.

公开(公告)号：US5073880A

公开(公告)日：1991-12-17

申请号：US285584

申请日：1988-12-16

申请人： Takeshi Maeda ,  Yoshito Tsunoda

发明人： Takeshi Maeda ,  Yoshito Tsunoda

IPC分类号： G11B7/09 ,  G11B11/105 ,  G11B21/10

CPC分类号： G11B7/0938 ,  G11B11/10565 ,  G11B11/10578 ,  G11B21/106

摘要： Data recording and/or reproduction on or from a recording medium on which tracking signal detection marks are intermittently provided along each track in a pattern wobbling alternately across the track center line with a very small lateral displacement therefrom, wherein data recording area is defined between the tracking signal detection mark. A servo control system for controlling a write/read light spot so as to follow the track with the aid of a tracking signal obtained by detecting the tracking signal detection marks is provided with a low-pass filter circuit having a cut-off frequency lower than the frequency at which the tracking signal detection marks are detected. A data is recorded or reproduced on or from the recording areas of the recording medium while following the track under the control of the servo system. A blank area where data recording is inhibited is provided between the data recording area and the tracking signal detecting mark (prepit) to suppress interference to the data. A particular access prepit pattern which allows track addresses to be at least approximately detected upon passing of the light spot over the track of the recording medium is previously provided together with synchronizing marks in a synchronizing area.

公开(公告)号：US4855991A

公开(公告)日：1989-08-08

申请号：US10428

申请日：1987-02-03

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

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

IPC分类号： G11B7/007 ,  G11B7/09 ,  G11B7/095 ,  G11B7/24 ,  G11B27/30

CPC分类号： G11B27/30 ,  G11B20/10203 ,  G11B7/00745 ,  G11B7/09 ,  G11B7/094 ,  G11B7/0956 ,  G11B2220/2537

摘要： An optical disk having a disk-like substrate and a recording layer provided on the substrate. First and second regions are alternately arranged along a rotational direction of the optical disk. The first region includes a pre-formed optically detectable portion having an address area, and the second region has a guide groove serving as an optical guide for a light spot. A track offset detection area is provided for detecting track offset due to inclination of the optical disk and is disposed with respect to the first region and the second region so that the light spot is not affected by the first region and the second region. The track offset detection area is preferably a mirror portion disposed between the first region and the second region.

公开(公告)号：US4293944A

公开(公告)日：1981-10-06

申请号：US810166

申请日：1977-06-27

申请人： Morishi Izumita ,  Takeshi Maeda ,  Yoshito Tsunoda ,  Susumu Sawano

发明人： Morishi Izumita ,  Takeshi Maeda ,  Yoshito Tsunoda ,  Susumu Sawano

IPC分类号： G11B7/0037 ,  G11B7/09 ,  G11B7/095 ,  G11B7/12 ,  G11B17/00

CPC分类号： G11B7/0037 ,  G11B7/0909 ,  G11B7/0953

摘要： Information play-back apparatus comprising a laser source, a recording medium, a photodetector, a first optical system which conducts a laser beam from the laser source to an information track on the recording medium as a read spot, and a second optical system which conducts a reflected laser beam from the information track to the photodetector through an optical element having the unidirectional lens action, said optical element being arranged in a manner to define an angle of about 45 degrees relative to the direction of the information track, and said photodetector having at least four light receiving portions divided symmetrically about two axes such that at least one light receiving portion is in each of the four quadrants formed by two axes, and one of the axes is parallel to the direction of the information track.

摘要翻译： 信息回放装置，包括激光源，记录介质，光电检测器，将来自激光源的激光束传导到作为读取点的记录介质上的信息轨道的第一光学系统，以及第二光学系统， 通过具有单向透镜作用的光学元件从信息轨道到光电检测器的反射激光束，所述光学元件以相对于信息轨道的方向限定约45度的角度的方式布置，并且所述光电检测器具有 至少四个光接收部分围绕两个轴对称地分开，使得至少一个光接收部分在由两个轴形成的四个象限中的每一个中，并且一个轴平行于信息轨道的方向。

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。