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24 条记录 (耗时 0.021 秒)

    Skip circuit for recorded information reproducing unit
    11.
    发明公开
    Skip circuit for recorded information reproducing unit 失效
    ÜberspringungsschaltungfüreinWiedergabegerätvon aufgezeichneten Informationen。

    公开(公告)号：EP0158245A2

    公开(公告)日：1985-10-16

    申请号：EP85103826.5

    申请日：1985-03-29

    申请人： HITACHI, LTD.

    发明人： Ikoma, Junichi ,  Funakawa, Katsuo ,  Abe, Masayuki 502-go, Cityflats-shimizugaoka ,  Ohnuki, Nobutaka ,  Iwasaki, Naoya ,  Fukui, Yukio ,  Okazaki, Kichizaemon ,  Miura, Yoshio

    IPC分类号： G11B7/08 ,  G11B7/095

    CPC分类号： G11B21/02 ,  G11B7/08517 ,  G11B7/08535

    摘要： A skip circuit for moving the pickup means from a track to another track at high speed is disclosed. The servo loop in the tracking servo system used for tracking the track during the movement between the tracks is interrupted and then the pickup means is moved to the object track. During the movement to the object track, the force which cancels the displacement force of the spring suspending the actuator used for tracking servo system is supplied to the actuator. After the predetermined number of tracks skipped has been counted, the servo loop is closed and the brake force is supplied to the actuator to stop the track movement.

    摘要翻译： 公开了一种用于将拾取装置从轨道高速移动到另一个轨道的跳过电路。 用于在轨道之间移动期间跟踪轨道的跟踪伺服系统中的伺服环路被中断，然后拾取装置移动到物体轨道。 在移动到物体轨道的过程中，将致动器提供抵消用于跟踪伺服系统的致动器悬挂弹簧的位移力的力。 在已经计数预定数量的轨迹之后，伺服回路闭合，制动力被提供给致动器以停止轨道移动。

    Optical head
    14.
    发明公开
    Optical head 有权

    公开(公告)号：EP0936603A3

    公开(公告)日：1999-10-06

    申请号：EP99301040.4

    申请日：1999-02-12

    申请人： Hitachi, Ltd.

    发明人： Shimano, Takeshi ,  Nakamura, Shigeru ,  Ohnishi, Kunikazu ,  Inoue, Masayuki ,  Fukui, Yukio

    IPC分类号： G11B7/12

    CPC分类号： G11B7/1353 ,  G11B7/00718 ,  G11B7/0903 ,  G11B7/0909 ,  G11B7/094 ,  G11B7/0941 ,  G11B7/0943 ,  G11B7/131 ,  G11B7/1367 ,  G11B7/1381 ,  G11B2007/0006

    摘要： An optical head eliminates an disturbance which occurs in a focus error signal in association with the decentering of an optical disk (107) when an optical spot crosses a track on a storage film surface, and in addition the optical head cancels an off-set which occurs in a tracking error signal in association with the movement of an objective lens (106). In the constitution of the optical head, phases of wave surfaces of ±1st order diffracted lights are shifted by an amount of λ/2 with a common period by using a phase-inverted diffraction grating (701) the phase of which is inverted with a period of Dλ/(2P · NA) in a radial direction of the optical disk (107), thus causing, on the optical disk (107), sub-spots (109, 110) to be located on the same track as a main-spot (108). Taking advantage of this location, focal point shift error signals of the main-spot 108 and the sub-spots (109, 110) are added to each other with an appropriate gain ratio, thereby making it possible to cancel the disturbance which occurs in the focus error signal. Meanwhile, tracking error signals of the main-spot (108) and the sub-spots (109, 110) according to a push-pull method are subtracted from each other with an appropriate gain ratio, thereby making it possible to cancel the off-set.

    Optical disk apparatus and optical head thereof
    16.
    发明公开
    Optical disk apparatus and optical head thereof 失效
    OptischesPlattengerätund optischer Kopfdafür

    公开(公告)号：EP0762403A3

    公开(公告)日：1997-07-02

    申请号：EP96306505.7

    申请日：1996-09-06

    申请人： HITACHI, LTD.

    发明人： Sugi, Yasuyuki ,  Sugiyama, Toshio ,  Imada, Nobuo ,  Shinohara, Hidenori ,  Fukui, Yukio

    IPC分类号： G11B7/135 ,  G11B7/125 ,  G11B7/12

    CPC分类号： G11B7/13925 ,  G11B7/1376 ,  G11B7/1378 ,  G11B19/12 ,  G11B2007/0006

    摘要： The present invention comprises an arrangement with removable optical element having a predetermined focal distance in the light path between a light source and an objective lens, so as to insert said optical element into the light path between the light source and the objective lens for playing back or recording onto one type of thickness of disk plates, as well as to remove it therefrom for playing back or recording onto another type of thickness of disk plates. Alternatively, by retaining variably the distance between the light source and the collimator lens, the distance between the light source and the collimator lens along with the light path is variably changed according to the thickness of the disk plate being inserted. Then by determining the type of the disk inserted and accordingly selectably inserting/removing the optical element, only one objective lens may be used to conform to the disk plates having different thicknesses.

    摘要翻译： 本发明包括具有在光源和物镜之间的光路中具有预定焦距的可拆卸光学元件的装置，以便将所述光学元件插入到光源和物镜之间的光路中以便回放 或记录在一种类型的盘片的厚度上，以及将其从中移除，以便播放或记录在另一种厚度的盘片上。 或者，通过可变地保持光源和准直透镜之间的距离，光源与准直透镜之间的距离以及光路可根据插入的盘片的厚度而变化。 然后，通过确定插入的盘的类型并相应地可选择地插入/移除光学元件，可以仅使用一个物镜来符合具有不同厚度的盘片。

    Optical information recording method and apparatus and recording medium used therefor
    18.
    发明公开
    Optical information recording method and apparatus and recording medium used therefor 失效
    光信息记录方法及其使用的装置和记录介质

    公开(公告)号：EP0345752A3

    公开(公告)日：1991-10-09

    申请号：EP89110279.0

    申请日：1989-06-07

    申请人： HITACHI, LTD.

    发明人： Goto, Norio ,  Ishigaki, Masaji ,  Fukui, Yukio

    IPC分类号： G11B7/00 ,  G11B7/24

    CPC分类号： G11B7/126 ,  G11B7/006 ,  G11B7/24

    摘要： A method and apparatus for optically recording information in which the phase state of each recording position of the recording film of a recording medium such as an optical disk is reversibly changed between an amorphous phase and a crystalline phase using a single laser beam, thereby optically recording information on the recording film. The recording position on the recording film is heated to the melting point thereof or more through laser beam irradiation irrespectively of the information to be recorded. After completion of the heating, in order to change the phase state of the recording film at the recording position in accordance with the information, the power and/or irradiation time of the laser beam is controlled so as to provide different times required for the temperature of the recording position to pass the crystallization temperature region of the recording film. The recording medium has at least one record of data indicative of the melting point of the recording film and data indicative of the time required to pass the crystallization temperature region for placing the recording position in the amorphous or crystalline state.

    Method of recording and reproducing digital information and apparatus therefor
    20.
    发明公开
    Method of recording and reproducing digital information and apparatus therefor 失效
    一种用于记录和再现数字为此信息和装置的方法。

    公开(公告)号：EP0233984A1

    公开(公告)日：1987-09-02

    申请号：EP86109515.6

    申请日：1986-07-11

    申请人： HITACHI, LTD.

    发明人： Ishigaki, Masaji ,  Onuki, Hideo ,  Fukui, Yukio ,  Inoue, Masayuki ,  Ohnishi, Kunikazu

    IPC分类号： G11B7/013 ,  G11B7/007 ,  G11B7/00

    CPC分类号： G11B7/24085 ,  G11B7/004

    摘要： A digital information recording and reproducing method for significantly improving the transfer rate of digital information, comprises the steps of: forming a plurality of light beam guide trucks on a recording medium (3) capable of multiple light-wavelength recording, the trucks being spaced apart by a predetermined pitch (P) and each of the trucks comprising a series of pre-pits (1) disposed in a scan direction (A) and spaced apart by a pitch (W) longer than the diameter of a spot (2) of a light beam (14) for use in recording and reproducing; and recording and reproducing an information bit (21) by changing the light beam (14) to have a different wavelength predetermined n times in a predetermined order while the light beam (14) is scanned by one pitch (W) between the pre-pits (1).