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    Information recording method and apparatus
    3.
    发明公开
    Information recording method and apparatus 失效
    Verfahren und Vorrichtung zur Informationsaufzeichnung

    公开(公告)号：EP0802531A2

    公开(公告)日：1997-10-22

    申请号：EP97106113.0

    申请日：1997-04-14

    申请人： HITACHI, LTD.

    发明人： Miyamoto, Makoto ,  Ohtake, Masatoshi ,  Terao, Motoyasu ,  Miyauchi, Yasushi ,  Hirotsune, Akemi ,  Miyamoto, Harukazu ,  Fukui, Yukio ,  Tokushuku, Nobuhiro ,  Sugiyama, Hisataka ,  Minemura, Hiroyuki ,  Fushimi, Tetsuya

    IPC分类号： G11B11/10 ,  G11B7/00

    CPC分类号： G11B7/126 ,  G11B7/0045 ,  G11B11/10595

    摘要： An information recording method of and an information recording apparatus for carrying out a recording of information by irradiating an energy beam to an information recording medium (1) by modulating power of the energy beam at least at a high power level and at an intermediate power level lower than the high power level, wherein a recording is carried out in a recording waveform having a downward directed pulse toward a power level (P11) lower than the intermediate power level (Pm1) after continuous high-power pulse trains of the power level (Ph1) so that the width of the downward directed pulse is changed according to a relative speed of the energy beam and the information recording medium (1).

    摘要翻译： 一种信息记录方法和信息记录装置，用于通过至少在高功率水平和中等功率水平调制能量束的功率，通过向信息记录介质（1）照射能量束来执行信息的记录 低于高功率电平，其中在具有向下定向脉冲的记录波形中进行记录，所述记录波形在功率电平的连续高功率脉冲串之后朝向低于中间功率电平（Pm1）的功率电平（P11） Ph1），使得向下指向的脉冲的宽度根据能量束和信息记录介质（1）的相对速度而改变。

    Tracking control apparatus
    4.
    发明公开
    Tracking control apparatus 失效
    跟踪控制装置

    公开(公告)号：EP0499122A3

    公开(公告)日：1992-10-28

    申请号：EP92101794.3

    申请日：1992-02-04

    申请人： HITACHI, LTD.

    发明人： Suzuki, Motoyuki ,  Suzuki, Yoshio ,  Fukui, Yukio

    IPC分类号： G11B7/085

    CPC分类号： G11B7/0901

    摘要： A tracking control apparatus comprises an A/D converter (20), an edge detection circuit (25), a latch circuit (22) and a ROM (23) to change a tracking error signal (a) having a sinusoidal characteristic to a relative position of a light beam and a track on a disk to have a linear characteristic to the relative position. Stable tracking control free from off-tracking due to disturbance is attained even when amplitudes of the tracking error signal (a) and a tracking sum signal are not equal.

    Optical head
    5.
    发明公开
    Optical head 审中-公开
    光学头

    公开(公告)号：EP1220213A1

    公开(公告)日：2002-07-03

    申请号：EP02005573.7

    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 ,  G11B7/135 ,  G11B7/09 ,  G11B7/095 ,  G11B7/13

    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 information reproducing method for reproducing information recorded on an optical disk (107), wherein light from a semiconductor laser (101) is converged as at least one focused spot on the optical disk. The light is reflected as a plurality of reflected light beams the polarities of the intensity distributions of which are mutually in a substantially inverted relationship with each other when the focused spot crosses a track of the optical disk. The reflected beams are detected and their respective focus error signals are added to obtain a focus error signal, and their respective tracking error signals are subtracted to obtain a tracking error signal. The optical disk has a groove width equal to substantially one half of its track pitch. The tracking error signals may be amplified by a gain proportional to a ratio between reciprocals of respective total amounts of light reflected by the plurality of reflected beams.

    摘要翻译： 一种信息再现方法，用于再现记录在光盘（107）上的信息，其中来自半导体激光器（101）的光被会聚为光盘上的至少一个聚焦点。 光被反射为多个反射光束，当聚焦点与光盘的轨道相交时，其强度分布的极性彼此基本上呈相反的关系。 反射光束被检测并且它们各自的聚焦误差信号被相加以获得聚焦误差信号，并且它们各自的跟踪误差信号被减去以获得跟踪误差信号。 光盘的槽宽基本上等于其轨道间距的一半。 跟踪误差信号可以通过与由多个反射光束反射的各个总光量的倒数之间的比例成比例的增益来放大。

    Optical head
    6.
    发明公开
    Optical head 有权
    光学头

    公开(公告)号：EP0936603A2

    公开(公告)日：1999-08-18

    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.

    摘要翻译： 当光点与存储膜表面上的轨道相交时，光学头消除了与光盘（107）的偏心相关的聚焦误差信号中出现的干扰，此外光学头消除了偏移 伴随着物镜（106）的移动而产生跟踪误差信号。 在光学头的构造中，通过使用相位反转衍射光栅（701），±1次衍射光的波面的相位以公共周期偏移量λ/ 2 （107）的半径方向上的Dλ/（2P·NA）的周期，由此在光盘（107）上使子点（109,110）位于相同的轨道上作为主 （108）。 利用该位置，主点108和子点（109,110）的焦点偏移误差信号以适当的增益比彼此相加，由此可以消除在主点108和子点（109,110）中出现的干扰 聚焦误差信号。 同时，根据推挽方法的主光点（108）和副光点（109,110）的跟踪误差信号以适当的增益比彼此相减，由此可以消除偏离光点 组。

    Optical disk apparatus and optical head thereof
    7.
    发明公开
    Optical disk apparatus and optical head thereof 失效
    光盘装置及其光学头

    公开(公告)号：EP0762403A2

    公开(公告)日：1997-03-12

    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用于回放 或记录到一种类型厚度的盘片上，并将其从中移出以便重放或记录到另一种厚度的盘片上。 或者，通过可变地保持光源与准直透镜之间的距离，光源与准直透镜之间的距离与光路一起根据插入的圆盘板的厚度可变地改变。 然后，通过确定所插入的光盘的类型并相应地选择性地插入/移除光学元件，可以仅使用一个物镜来适应具有不同厚度的光盘片。

    Tracking control apparatus
    8.
    发明公开
    Tracking control apparatus 失效
    Spurfolgesteuergerät。

    公开(公告)号：EP0499122A2

    公开(公告)日：1992-08-19

    申请号：EP92101794.3

    申请日：1992-02-04

    申请人： HITACHI, LTD.

    发明人： Suzuki, Motoyuki ,  Suzuki, Yoshio ,  Fukui, Yukio

    IPC分类号： G11B7/085

    CPC分类号： G11B7/0901

    摘要： A tracking control apparatus comprises an A/D converter (20), an edge detection circuit (25), a latch circuit (22) and a ROM (23) to change a tracking error signal (a) having a sinusoidal characteristic to a relative position of a light beam and a track on a disk to have a linear characteristic to the relative position. Stable tracking control free from off-tracking due to disturbance is attained even when amplitudes of the tracking error signal (a) and a tracking sum signal are not equal.

    摘要翻译： 跟踪控制装置包括A / D转换器（20），边缘检测电路（25），锁存电路（22）和ROM（23），用于将具有正弦特征的跟踪误差信号（a）改变为相对 在光盘上的光束和轨道的位置对相对位置具有线性特征。 即使跟踪误差信号（a）的幅度和跟踪和信号不相等，也可以获得由于干扰而不受偏移的稳定的跟踪控制。

    Optical information recording method and apparatus and recording medium used therefor
    10.
    发明公开
    Optical information recording method and apparatus and recording medium used therefor 失效
    Optische Informationsaufzeichnungsmethode undGerätund Aufzeichnungsmediumdafür。

    公开(公告)号：EP0345752A2

    公开(公告)日：1989-12-13

    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.

    摘要翻译： 一种用于光学记录信息的方法和装置，其中使用单个激光束在非晶相和结晶相之间可逆地改变诸如光盘的记录介质的记录膜的每个记录位置的相位状态，从而光学记录 关于录影片的信息。 通过激光束照射将记录膜上的记录位置加热到其熔点以上，而不管要记录的信息如何。 在完成加热之后，为了根据该信息改变记录位置处的记录膜的相位状态，控制激光束的功率和/或照射时间，以便提供温度所需的不同时间 的记录位置以通过记录膜的结晶温度区域。 记录介质具有指示记录膜的熔点的数据的至少一个记录和表示通过用于将记录位置置于非晶态或结晶状态的结晶温度区所需的时间的数据。