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1.发明授权Focus error detection apparatus utilizing focusing an front and rear sides of focal planes 失效利用聚焦平面的前后侧的聚焦误差检测装置
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。
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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
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。
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3.发明授权Optical memory apparatus using an optical disc having guide-grooves of V-shape and predetermined optical depth and access method therefor 失效使用具有V形导向槽和预定光学深度的光盘的光存储装置及其访问方法
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
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。
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公开(公告)号：US4532522A
公开(公告)日：1985-07-30
申请号：US408678
申请日：1982-08-16
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。
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5.发明授权Optical track position detecting apparatus and optical information processor using the same 失效光轨位置检测装置及使用其的光信息处理器
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
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。
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公开(公告)号：US4663751A
公开(公告)日：1987-05-05
申请号：US515520
申请日：1983-07-20
CPC分类号： G11B27/30 , G11B20/10203 , G11B7/00745 , G11B7/09 , G11B7/094 , G11B7/0956 , G11B2220/2537
摘要： An optical information processor including a recording medium with a guide groove having interrupting portions therealong in the form of mirror areas for reflecting light impinging on the recording medium. A light detector is provided for receiving diffraction light from the guide groove with a first signal detector being provided for differentially operating on signals from the light detector and generating a tracking signal tracking the guide groove. Additionally, a second signal detector is provided for detecting the signal from the light detector indicative of the mirror areas and providing an output indicative thereof which is utilized for compensating the tracking signal. The compensated tracking signal is then utilized for controlling the positioning of the light beam on the recording medium.
摘要翻译： 一种光学信息处理器，包括具有引导槽的记录介质，所述引导槽具有镜面区域形式的中断部分，用于反射入射到记录介质上的光。 提供了一种光检测器，用于接收来自引导槽的衍射光，第一信号检测器被提供用于对来自光检测器的信号进行差分操作，并产生跟踪引导槽的跟踪信号。 此外，提供第二信号检测器，用于检测来自光检测器的指示镜面积的信号，并提供用于补偿跟踪信号的指示的输出。 补偿的跟踪信号然后用于控制光束在记录介质上的定位。
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公开(公告)号：US4855991A
公开(公告)日：1989-08-08
申请号：US10428
申请日：1987-02-03
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.
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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。
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9.发明授权Optical card having optical grooves for access and wobbled marks for tracking and a recording-reproducing apparatus therefor 失效具有用于访问的光学凹槽和用于跟踪的摆动标记的光学卡及其记录再现装置
公开(公告)号：US4985616A
公开(公告)日：1991-01-15
申请号：US153003
申请日：1988-02-08
申请人： Shigeru Nakamura , Yoshito Tsunoda , Takeshi Maeda
发明人： Shigeru Nakamura , Yoshito Tsunoda , Takeshi Maeda
CPC分类号： G11B7/0033 , G11B7/00745 , G11B7/0938
摘要： An optical card of the present invention has a card-shaped recording layer whose optical characteristic is varied by a laser beam applied thereon, and a resin layer for protecting this recording layer. The recording layer has optical grooves provided at a substantially equal interval in the opposite end portions of the recording layer respectively and varying the light intensity of the laser beam when the beam traverses the grooves, and first and second optical markers provided at a prescribed interval in the direction of extension of each of the optical grooves and varying the light intensity of the laser beam which passes them. The optical grooves are made longer every prescribed number thereof than others, and the longer optical grooves are used for zone access, while the shorter optical grooves are used for track access in a zone. The first and second optical markers are provided at positions deviated alternately at equal distance from the center of a track, and operate as so-called wobble pits to detect a track error. These markers are used also as timing marks for generating a clock signal.
摘要翻译： 本发明的光卡具有通过施加激光的光学特性而变化的卡状记录层和用于保护该记录层的树脂层。 记录层具有分别在记录层的相对端部设置大致相等的间隔的光学槽，并且当光束横过槽时改变激光束的光强度，以及以规定间隔设置的第一和第二光学标记 每个光学凹槽的延伸方向和改变通过它们的激光束的光强度。 光槽比其他规定的数量更长，并且较长的光槽用于区域访问，而较短的光槽用于区域中的轨道通道。 第一和第二光学标记设置在与轨道的中心相等的距离处交替地偏离的位置，并且作为所谓的摆动坑进行操作以检测轨道误差。 这些标记也用作产生时钟信号的定时标记。
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公开(公告)号：US4731771A
公开(公告)日：1988-03-15
申请号：US829024
申请日：1986-02-13
CPC分类号： G11B7/08529 , G11B7/08517 , G11B7/0901
摘要： This invention relates to a track setting method for a tracking servo system in an optical disk device and a device therefor. According to this invention the track passage velocity when the light spot moves across the track is detected and setting of the light spot onto the track is performed under the condition that the passage velocity thus detected is lower than a predetermined velocity. In the case where the passage velocity is greater than the predetermined velocity, the light spot is forced to move so that the passage velocity is lower than the predetermined velocity and the light spot is set up thereafter.
摘要翻译： 本发明涉及一种用于光盘装置中的跟踪伺服系统的轨道设置方法及其装置。 根据本发明，检测到光点移动通过轨迹时的轨迹通过速度，并且在由此检测到的通过速度低于预定速度的条件下执行光点到轨道上的设置。 在通过速度大于预定速度的情况下，迫使光斑移动，使得通过速度低于预定速度，此后设定光斑。
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