公开(公告)号：US5235591A

公开(公告)日：1993-08-10

申请号：US641309

申请日：1991-01-15

申请人： Shigeru Nakamura ,  Eiichi Seya ,  Seiichi Mita ,  Masuo Kasai ,  Masahiro Ojima ,  Hiroshi Yasuoka ,  Motoyasu Terao ,  Yoshinori Miyamura ,  Takeshi Nakao ,  Kiyoshi Matsumoto ,  Yoshihiro Hamakawa

发明人： Shigeru Nakamura ,  Eiichi Seya ,  Seiichi Mita ,  Masuo Kasai ,  Masahiro Ojima ,  Hiroshi Yasuoka ,  Motoyasu Terao ,  Yoshinori Miyamura ,  Takeshi Nakao ,  Kiyoshi Matsumoto ,  Yoshihiro Hamakawa

IPC分类号： G11B7/12 ,  G11B7/14 ,  G11B33/14

CPC分类号： G11B7/14 ,  G11B33/14 ,  G11B7/122

摘要： A separation type optical head according to the present invention includes at least a light source portion for emitting collimated beams, a focusing device (a focusing lens) for focusing the collimated beams onto an information recording surface of an optical disc medium, a focal point control mechanism for the position of the spot on the information recording surface, and a photo-detection portion for receiving beams reflected by the information recording surface. The structure is divided into a fixed portion including the light source portion and the photo-detection portion and a movable portion including the focusing device (focusing lens) and the focal point control mechanism. At least the movable portion of the separation type optical head is movably accommodated n a frame (sealing case) for the optical head so as to prevent irregular vibrations of the movable portion due to high speed air flows or turbulence. Furthermore, a focal point control mechanism of an air float type may be employed in the movable portion of the separation type optical head so as to actively utilize the high speed air flow generated due to the rotation of the disc medium to perform a rough adjustment of the focal point of the focusing device.

摘要翻译： 根据本发明的分离型光学头至少包括用于发射准直光束的光源部分，用于将准直光束聚焦到光盘介质的信息记录表面上的聚焦装置（聚焦透镜），焦点控制 在信息记录表面上的位置的机构，以及用于接收由信息记录表面反射的光束的光检测部分。 该结构被分为包括光源部分和光检测部分的固定部分和包括聚焦装置（聚焦透镜）和焦点控制机构的可动部分。 至少分离型光学头的可移动部分可移动地容纳在用于光学头的框架（密封壳体）中，以防止由于高速空气流动或湍流引起的可移动部分的不规则振动。 此外，可以在分离型光学头的可动部分中采用气浮式的焦点控制机构，以便主动地利用由于盘介质的旋转而产生的高速气流来进行粗略调整 聚焦装置的焦点。

公开(公告)号：US4970707A

公开(公告)日：1990-11-13

申请号：US239389

申请日：1988-09-01

申请人： Fumio Hara ,  Yoshito Tsunoda ,  Shigeru Nakamura ,  Yoshizumi Eto ,  Seiichi Mita ,  Morishi Izumita ,  Hiroyuki Tsuchinaga ,  Masuo Kasai

发明人： Fumio Hara ,  Yoshito Tsunoda ,  Shigeru Nakamura ,  Yoshizumi Eto ,  Seiichi Mita ,  Morishi Izumita ,  Hiroyuki Tsuchinaga ,  Masuo Kasai

IPC分类号： G11B7/003 ,  G11B7/09

CPC分类号： G11B7/09 ,  G11B7/0031 ,  G11B7/0925

摘要： An optical tape apparatus having improved focus and tracking control. An optical head records, reproduces, or rewrites data on an optical tape by helically scanning the tape with a laser beam. A guide plate is disposed between the optical head and the tape to prevent the beam from becoming unfocused due to fluctuation of the tape cuased by an air film between the optical head and the tape. The optical head contains a semiconductor laser and an optical system exhibiting chromatic aberration for directing the laser beam onto the tape. The optical system includes a condenser lens for focusing the beam onto the tape. Fine focus control is achieved by changing the wavelength of the laser beam by directing part of the beam reflected from the tape back to the laser, thereby changing the focal point of the beam by virtue of the chromatic aberration of the optical system. Coarse focus control is achieved by mounting the condenser lens on a piezoelectric actuator which moves the consenser lens to focus the beam onto the tape. A recording head for recording timing marks and tracking signals on the tape is disposed in advance of the optical head. A reading head reads the timing marks and the optical head reads the tracking signals. The timing marks and tracking signals are used to control the operation of the apparatus such that the tape is transported with a constant speed and data on diagonal signal tracks on the tape is accurately recorded, reproduced, or rewritten.

摘要翻译： 具有改进的聚焦和跟踪控制的光带装置。 光学头通过用激光束螺旋扫描磁带来记录，再现或重写光学带上的数据。 引导板设置在光头和带之间，以防止由于光头和带之间的空气膜带来的带的波动而导致光束不聚焦。 光头包含半导体激光器和具有用于将激光束引导到带上的色差的光学系统。 光学系统包括用于将光束聚焦到胶带上的聚光透镜。 通过将从带反射的光束的一部分引回到激光器来改变激光束的波长，从而通过光学系统的色差来改变光束的焦点来实现精细对焦控制。 通过将聚光透镜安装在压电致动器上来实现粗调焦控制，该压电致动器移动辅助透镜以将光束聚焦到带上。 在光学头之前设置用于在带上记录定时标记和跟踪信号的记录头。 读头读取定时标记，光头读取跟踪信号。 定时标记和跟踪信号用于控制装置的操作，使得磁带以恒定速度传送，并且磁带上对角线信号轨道上的数据被精确地记录，再现或重写。

公开(公告)号：US5511050A

公开(公告)日：1996-04-23

申请号：US705535

申请日：1991-05-24

申请人： Kiyoshi Matsumoto ,  Takeshi Maeda ,  Shigeru Nakamura ,  Mariko Umeda ,  Masuo Kasai

发明人： Kiyoshi Matsumoto ,  Takeshi Maeda ,  Shigeru Nakamura ,  Mariko Umeda ,  Masuo Kasai

IPC分类号： G11B7/007 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B7/0909 ,  G11B7/0917 ,  G11B7/128 ,  G11B7/1353 ,  G11B7/1398 ,  G11B11/10576 ,  G11B7/00745 ,  G11B7/0938 ,  G11B7/0943

摘要： A focus error detecting method and an optical head using it. In the focus error detecting method, a light beam is emitted from a light source, the beam is given positive and negative astigmatism by a diffraction grating or an acoustooptic element in a focusing optical system, beams thus formed are focused on an information recording surface, the beams reflected from the information recording surface are received by photo-detecting elements in separated optics, the reflected beams with positive and negative astigmatism are compared with each other to take a difference in a focus error detecting circuit, and a focus error detecting signal is obtained on the basis of the difference. The focus for the optical head can be adjusted using the focus error detecting signal.

摘要翻译： 聚焦误差检测方法和使用它的光头。 在聚焦误差检测方法中，从光源发射光束，聚焦光学系统中的光束由衍射光栅或声光元件给出正和负像散，所形成的光束聚焦在信息记录表面上， 从信息记录表面反射的光束被分离的光学元件中的光检测元件接收，将具有正和负像散的反射光束彼此进行比较以获得聚焦误差检测电路的差异，并且聚焦误差检测信号为 根据差异获得。 可以使用聚焦误差检测信号调整光学头的焦点。

公开(公告)号：US5644554A

公开(公告)日：1997-07-01

申请号：US38080

申请日：1993-03-29

申请人： Kunio Harada ,  Toshimitsu Kaku ,  Masuo Kasai ,  Masahiro Ojima

发明人： Kunio Harada ,  Toshimitsu Kaku ,  Masuo Kasai ,  Masahiro Ojima

IPC分类号： G11B5/54 ,  G11B11/105 ,  G11B11/12

CPC分类号： G11B5/54 ,  G11B11/10552 ,  G11B11/10558 ,  G11B11/10571

摘要： A magnetic head is supported with variable stiffness for loading onto the disk surface and unloading off the disk surface. The magnetic head is attached to an end of a thin leaf spring which has been curved in advance, and the leaf spring is interposed between two flat plates, with one of the flat plates being slidable. With the slidable flat plate being moved to the position where the plate overlies a fitting section of the magnetic head, a head support point is provided at a first position with respect to the magnetic head, the thin leaf spring takes an extending straightened state, and at the same time, the thin leaf spring, two flat plates, and magnetic head fitting section form a unitary member with a high stiffness for supporting the magnetic head thereby to load the magnetic head onto the disk surface. With the slidable plate being moved in the opposite direction so as to free the curved section of the thin leaf spring, a second head support point provided at a position further away from the magnetic head than the first position, and the magnetic head is supported flexibly with a lower stiffness by the thin leaf spring. Since the thin leaf spring curves in a free state at this moment, the magnetic head which is attached to the end of the leaf spring is unloaded off the disk surface as if it is whipped up.

摘要翻译： 磁头被支撑，可变刚度用于装载到盘表面上并卸下盘表面。 磁头安装在预先弯曲的薄板弹簧的端部，并且板簧插入在两个平板之间，其中一个平板可滑动。 随着可滑动的平板被移动到板位于磁头的配合部分的位置，头部支撑点设置在相对于磁头的第一位置处，薄片弹簧具有延伸的拉直状态，并且 同时，薄片弹簧，两个平板和磁头配合部分形成具有高刚度的整体构件，用于支撑磁头，从而将磁头加载到磁盘表面上。 随着可滑动板沿相反方向移动以便释放薄片弹簧的弯曲部分，设置在比第一位置更远离磁头的位置处的第二磁头支撑点，并且磁头被灵活地支撑 薄板弹簧具有较低的刚度。 由于此时薄片弹簧处于自由状态弯曲，因此附接到板簧端部的磁头就像被鞭打一样从盘表面卸载。

公开(公告)号：US5396477A

公开(公告)日：1995-03-07

申请号：US406735

申请日：1989-09-13

申请人： Kiyoshi Matsumoto ,  Takeshi Maeda ,  Masuo Kasai

发明人： Kiyoshi Matsumoto ,  Takeshi Maeda ,  Masuo Kasai

IPC分类号： G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/13 ,  G11B7/135 ,  G11B11/105 ,  G11B27/22 ,  G11B7/00

CPC分类号： G11B27/22 ,  G11B11/10543 ,  G11B7/08517 ,  G11B7/08541 ,  G11B7/08588 ,  G11B7/0904 ,  G11B7/094 ,  G11B7/128 ,  G11B7/13 ,  G11B7/1353 ,  G11B11/10576 ,  G11B7/00745 ,  G11B7/0938 ,  G11B7/0943

摘要： A light spot positioning method and apparatus for performing a seek operation of positioning a record/playback light spot at a desired track on a recording medium by a macro moving mechanism for an optical head and a micro moving mechanism mounted on the optical head or the base of the apparatus, and for selecting the bandwidth of the control servo of the micro moving mechanism to be higher than 10 KHz during a track pull-in operation. By selecting the bandwidth of control servo of the micro moving mechanism higher than 10 KHz, the track can be pulled in with the relative velocity between the track and the light spot remaining high. During a track following operation after the completion of the track access, the band of the control servo of the micro moving mechanism is changed to a low level of lower than 5 KHz.

摘要翻译： 一种光点定位方法和装置，用于通过用于光学头的微距移动机构和安装在光学头或基座上的微移动机构来执行将记录/回放光点定位在记录介质上的所需轨道上的寻道操作 并且用于在轨道拉入操作期间选择微移动机构的控制伺服器的带宽高于10KHz。 通过选择高于10KHz的微移动机构的控制伺服的带宽，可以将轨道与光点之间的相对速度保持高位拉入。 轨道接通完成后的跟踪操作期间，微移动机构的控制伺服的频带变为低于5KHz的低电平。

公开(公告)号：US5034941A

公开(公告)日：1991-07-23

申请号：US316786

申请日：1989-02-28

申请人： Masuo Kasai ,  Takeshi Maeda ,  Kiyoshi Matsumoto

发明人： Masuo Kasai ,  Takeshi Maeda ,  Kiyoshi Matsumoto

IPC分类号： G11B7/085 ,  G11B7/09

CPC分类号： G11B7/0945

摘要： A recording/reproduction head incorporates an optical system which produces two light spots on an optical disk at positions spaced out from each other by, for example, half the radial span of the effective area of the disk. In recording or reproducing information using the two light spots, the inner light spot is moved to an unused track area provided in the innermost section of the disk, an auto-focusing servo system for the inner light spot is started, a control track provided near the unused area is read to judge the compatibility of the disk, and, only when the disk compatibility is verified, the outer light spot is moved to an unused track area provided in the outermost section of the disk, and an auto-focusing servo system for the outer light spot is started by making reference to a signal to the already operating inner auto-focusing servo system. Although the outer auto-focusing servo system is started at the outermost section where the vertical swing of the disk is pronounced, the disk swing can be inferred from the signal of the already operating inner auto-focusing servo system, and therefore it can be started stably even over the outer section with a large vertical swing at a timing of minimal swing imparted by the signal of the inner auto-focusing servo system.

摘要翻译： 记录/再现头包括光学系统，该光学系统通过例如盘的有效区域的半径跨度在彼此间隔开的位置处在光盘上产生两个光点。 在使用两个光点记录或再现信息时，将内部光点移动到设置在盘的最内部的未使用的轨道区域，开始用于内部光点的自动聚焦伺服系统，附近设置的控制轨道 读取未使用区域以判断盘的兼容性，并且仅当验证了盘兼容性时，外部光点移动到设置在盘的最外部的未使用的轨道区域，并且自动聚焦伺服系统 通过参考已经运行的内部自动聚焦伺服系统的信号来启动外部光点。 虽然外部自动对焦伺服系统在盘的垂直摆动的最外侧开始，但是可以从已经运行的内部自动聚焦伺服系统的信号推断出盘摆动，因此可以开始 在由内部自动聚焦伺服系统的信号施加的最小摆动的时刻，稳定地稳定地在外侧部分上具有大的垂直摆动。

公开(公告)号：US4731771A

公开(公告)日：1988-03-15

申请号：US829024

申请日：1986-02-13

申请人： Takeshi Maeda ,  Kazuo Shigematsu ,  Shigeru Nakamura ,  Yoshito Tsunoda ,  Masuo Kasai

发明人： Takeshi Maeda ,  Kazuo Shigematsu ,  Shigeru Nakamura ,  Yoshito Tsunoda ,  Masuo Kasai

IPC分类号： G11B7/085 ,  G11B7/09

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。

公开(公告)号：US4120042A

公开(公告)日：1978-10-10

申请号：US731317

申请日：1976-10-12

申请人： Masuo Kasai ,  Shigeru Yoshizawa ,  Minoru Hiroshima

发明人： Masuo Kasai ,  Shigeru Yoshizawa ,  Minoru Hiroshima

IPC分类号： G11C19/08 ,  G11C19/00

CPC分类号： G11C19/0858

摘要： A magnetic bubble information writing device capable of carrying out writing without erasing old information representing either "0" or "1" at a location, where new information is to be written, by means of only a single hairpin-like conductor loop is disclosed, in which the single hairpin-like conductor loop is disposed at a projecting portion of permalloy patterns, enclosing the portion.

摘要翻译： 公开了一种磁气泡信息写入装置，其能够仅通过仅一个发夹状导体环路在不消除表示“0”或“1”的旧信息的情况下进行写入，其中新信息将要被写入的位置， 其中单个发夹状导体环设置在坡莫合金图案的突出部分，包围该部分。

公开(公告)号：US4745587A

公开(公告)日：1988-05-17

申请号：US639541

申请日：1986-03-14

申请人： Takeshi Maeda ,  Masuo Kasai ,  Koji Muraoka

发明人： Takeshi Maeda ,  Masuo Kasai ,  Koji Muraoka

IPC分类号： G11B7/085 ,  G11B21/08 ,  G11B7/095

CPC分类号： G11B7/08588 ,  G11B21/085 ,  G11B7/085 ,  G11B7/08529

摘要： Access method and information retrieval apparatus in which an external scale is used during accessing an optical head to a desired track on a rotating recording medium. The number of scale pitches to a target track on the external scale is detected and the speed of the head is controlled by the number of scale pitches. An eccentricity status of the rotating recording medium is previously detected and the number of scale pitches is corrected in accordance with the detected eccentricity status so that a distance of movement in a speed control is corrected and an access time is shortened.

摘要翻译： 访问方法和信息检索装置，其中在将光学头访问到旋转记录介质上的期望轨道时使用外部刻度。 检测到外部刻度上的目标轨迹的刻度间距的数量，并且头的速度由刻度间距的数量来控制。 先前检测到旋转记录介质的偏心状态，并且根据检测到的偏心状态校正刻度间距的数量，从而校正速度控制中的移动距离并缩短访问时间。

公开(公告)号：US4736353A

公开(公告)日：1988-04-05

申请号：US828353

申请日：1986-02-11

申请人： Masuo Kasai ,  Koji Muraoka

发明人： Masuo Kasai ,  Koji Muraoka

IPC分类号： G11B7/085 ,  G11B21/08 ,  G11B7/00 ,  G11B21/10

CPC分类号： G11B21/085 ,  G11B7/08505 ,  G11B7/08564 ,  G11B7/08588

摘要： A method of accessing a rotary recording medium for positioning a head at a desired track on the rotary recording medium by using a coarse actuator and a fine actuator, comprising the steps of comparing an output signal produced from a detector for detecting movement of the fine actuator occurring immediately before initiation of an access operation of the coarse actuator with an output signal subsequently produced from the detector during the access operation of the coarse actuator to produce a comparison output signal, and locking the fine actuator at a state occurring immediately before the initiation of the access operation by driving the fine actuator on the basis of the comparison output signal to thereby suppress vibrations of the fine actuator due to translocations of the coarse actuator. An information memory apparatus utilizing the access method is also disclosed.

摘要翻译： 一种访问旋转记录介质的方法，用于通过使用粗略致动器和精细致动器将头部定位在旋转记录介质上的期望轨道上，包括以下步骤：比较由用于检测精细致动器的运动的检测器产生的输出信号 在粗略致动器的访问操作期间随后从检测器产生的输出信号开始粗略致动器的访问操作之前立即发生，以产生比较输出信号，并且将精细致动器锁定在紧接在开始之前发生的状态 通过基于比较输出信号驱动精细致动器的进入操作，从而抑制由于粗略致动器的易位导致的微动子的振动。 还公开了一种利用访问方法的信息存储装置。