公开(公告)号：EP0282744A3

公开(公告)日：1990-09-26

申请号：EP88102182.8

申请日：1988-02-15

申请人： HITACHI, LTD. ,  Hitachi Maxell Ltd.

发明人： Niihara, Toshio ,  Ito, Masaru ,  Shigematsu, Kazuo ,  Kaku, Toshimitsu ,  Taii, Toshiaki Hitachi Makuseru Shihoryo ,  Ohta, Norio ,  Yoshihiro, Masafumi Hitachi Makuseru Shioryo

IPC分类号： G11B11/10

CPC分类号： G11B7/0938 ,  G11B11/10582

摘要： A magneto-optical disk comprises at least a transparent substrate (1) having V-shaped grooves (6) formed therein, a transparent film (3) having a greater refractive index than that of the transparent substrate and a magnetic film (4). Information is recorded between adjacent ones of the V-shaped grooves (6). The V-shaped groove (6) has a depth shallower than λ/6 and deeper than λ/8 where λ represents wave length of laser light with which the magneto-optical disk is irradiated. Optimal tracking signal can be obtained without lowering the push-pull signal intensity for the tracking.

公开(公告)号：EP0282744A2

公开(公告)日：1988-09-21

申请号：EP88102182.8

申请日：1988-02-15

申请人： HITACHI, LTD. ,  Hitachi Maxell Ltd.

发明人： Niihara, Toshio ,  Ito, Masaru ,  Shigematsu, Kazuo ,  Kaku, Toshimitsu ,  Taii, Toshiaki Hitachi Makuseru Shihoryo ,  Ohta, Norio ,  Yoshihiro, Masafumi Hitachi Makuseru Shioryo

IPC分类号： G11B11/10

CPC分类号： G11B7/0938 ,  G11B11/10582

摘要： A magneto-optical disk comprises at least a transparent substrate (1) having V-shaped grooves (6) formed therein, a transparent film (3) having a greater refractive index than that of the transparent substrate and a magnetic film (4). Information is recorded between adjacent ones of the V-shaped grooves (6). The V-shaped groove (6) has a depth shallower than λ/6 and deeper than λ/8 where λ represents wave length of laser light with which the magneto-optical disk is irradiated. Optimal tracking signal can be obtained without lowering the push-pull signal intensity for the tracking.

摘要翻译： 磁光盘至少包括其中形成有V形槽（6）的透明基板（1），具有比透明基板更大的折射率的透明膜（3）和磁性膜（4）。 在相邻的V形槽（6）之间记录信息。 V形槽（6）的深度比λ/ 6浅，深于λ/ 8，其中λ表示照射磁光盘的激光的波长。 可以在不降低跟踪的推挽信号强度的情况下获得最佳跟踪信号。

公开(公告)号：EP0204255A2

公开(公告)日：1986-12-10

申请号：EP86107210.6

申请日：1986-05-27

申请人： Hitachi Maxell Ltd. ,  HITACHI, LTD.

发明人： Umeda, Jun-ichi ,  Shigematsu, Kazuo

IPC分类号： G11B7/24 ,  G11B7/26

CPC分类号： G11B7/26 ,  G11B7/241 ,  G11B7/252 ,  G11B7/2531 ,  G11B7/2575 ,  G11B2007/24306

摘要： An optical recording disc comprises a resin layer of resin material formed on a relatively rough surface of each of transparent disc substrates, the resin material having approximately the same refractive index of light as the refractive index of the transparent disc substrate, and a recording layer formed on each of said resin layers. Accordingly, the optical recording disc enables to decrease the production cost and to write and read an information signal into and from the recording layer at an improved signal to noise ratio than a conventional optical recording disc.

公开(公告)号：EP0204255A3

公开(公告)日：1989-04-12

申请号：EP86107210.6

申请日：1986-05-27

申请人： Hitachi Maxell Ltd. ,  HITACHI, LTD.

发明人： Umeda, Jun-ichi ,  Shigematsu, Kazuo

IPC分类号： G11B7/24 ,  G11B7/26

CPC分类号： G11B7/26 ,  G11B7/241 ,  G11B7/252 ,  G11B7/2531 ,  G11B7/2575 ,  G11B2007/24306

摘要： An optical recording disc comprises a resin layer of resin material formed on a relatively rough surface of each of transparent disc substrates, the resin material having approximately the same refractive index of light as the refractive index of the transparent disc substrate, and a recording layer formed on each of said resin layers. Accordingly, the optical recording disc enables to decrease the production cost and to write and read an information signal into and from the recording layer at an improved signal to noise ratio than a conventional optical recording disc.

公开(公告)号：EP0303936A2

公开(公告)日：1989-02-22

申请号：EP88112894.6

申请日：1988-08-08

申请人： HITACHI, LTD.

发明人： Kaku, Toshimitsu ,  Shigematsu, Kazuo ,  Sugiyama, Hisataka ,  Maeda, Takeshi ,  Takasago, Masahiro

IPC分类号： G11B7/09 ,  G11B7/095 ,  G11B7/08

CPC分类号： G11B7/094

摘要： Disclosed is an optical recording an reproducing apparatus comprising a light source (1) directing a light spot toward a recording medium (7), a detection system (11 - 14) detecting light reflected from the recording medium to derive an electrical signal from the reflected light, an information processing circuit (9) modulating the intensity of the light spot according to writing pulses to record information on the recording medium and using the electrical signal to reproduce information from the recording medium, and a tracking servo circuit (22, 23) carrying out tracking servo operation on the basis of the electrical signal and including an extracting circuit connected to a source of extracting pulses having a pulse width at least equal to the writing pulse width so that writing pulse parts contained in the electrical signal are extracted during recording information, whereby a track offset occurring during information recording can be minimized, and the stability of the tracking servo system can be improved.

摘要翻译： 公开了一种光记录装置，包括将光点引向记录介质（7）的光源（1）;检测系统（11-14），用于检测从记录介质反射的光，以从反射的 光，信息处理电路（9），根据写入脉冲调制光点的强度，以将信息记录在记录介质上，并使用电信号从记录介质再现信息;以及跟踪伺服电路（22,23） 基于电信号执行跟踪伺服操作，并且包括连接到具有至少等于写入脉冲宽度的脉冲宽度的提取脉冲的源的提取电路，使得在记录期间提取包含在电信号中的写入脉冲部分 信息，由此在信息记录期间发生的轨道偏移可以最小化，并且跟踪系统的稳定性 vo系统可以改进。

公开(公告)号：EP0050047B1

公开(公告)日：1986-02-26

申请号：EP81304799.0

申请日：1981-10-14

申请人： Hitachi, Ltd.

发明人： Terao, Motoyasu ,  Horigome, Shinkichi ,  Mitsuya, Munehisa ,  Ota, Sakae ,  Shigematsu, Kazuo

IPC分类号： G11B7/24 ,  B41M5/24 ,  G11B7/26

CPC分类号： G11B7/243 ,  G11B7/2531 ,  G11B7/2532 ,  G11B7/2533 ,  G11B7/2578 ,  G11B2007/24304 ,  G11B2007/24306 ,  G11B2007/24308 ,  G11B2007/2431 ,  G11B2007/24312 ,  G11B2007/24314 ,  G11B2007/24316

公开(公告)号：EP0135750A2

公开(公告)日：1985-04-03

申请号：EP84109355.2

申请日：1984-08-07

申请人： HITACHI, LTD.

发明人： Kaku, Toshimitsu D104-go, Hitachi-Koyasudai ,  Kataoka, Keiji ,  Tsunoda, Yoshito ,  Shigematsu, Kazuo

IPC分类号： G11B7/00 ,  G11B7/125 ,  G11B7/24 ,  G11B27/36 ,  G02F1/33 ,  G02B26/10

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

摘要： In an optical information recording and reproducing apparatus having a laser light source (1) and an optical system so that a beam from the laser light source is irradiated through the optical system on an information recording medium (20) to record and reproduce information, an acousto-optic modulator (4) is disposed in the optical system for receiving the beam from the laser light source, and a modulation unit (101) is provided which comprises an oscillator (50) for generating a plurality of signals at different frequencies, a modulator (51) for modulating the outputs of the oscillator and an adder (52) for adding together the outputs of the modulator.

公开(公告)号：EP0135370A1

公开(公告)日：1985-03-27

申请号：EP84305598.9

申请日：1984-08-17

申请人： HITACHI, LTD.

发明人： Terao, Motoyasu ,  Miyauchi, Yasushi ,  Shigematsu, Kazuo ,  Horigome, Shinkichi

IPC分类号： G11B7/24

CPC分类号： G11B7/257 ,  G11B7/00557 ,  G11B7/243 ,  G11B7/2572 ,  G11B2007/24316 ,  G11B2007/2432 ,  G11B2007/25708 ,  G11B2007/2571 ,  G11B2007/25715 ,  Y10S430/146 ,  Y10S430/165

摘要： An information recording member has an information recording film formed on a substrate either directly or with the interposition of at least one inorganic or organic protective layer and which undergoes change of atomic arrangement upon being irradiated by a recording beam. To improve the producibility of the member and its stability during its life, the recording film has and average composition in the direction of film thickness expressed by
where 2 ≤ × ≤ 40, 30 ≤ y ≤ 95, 3 ≤ z ≤ 45, O ≤ α ≤ 20 and M is at least one of As, Sb, Bi, S, Si, Ge, Sn, Pb, Aℓ, Ga, In, Tℓ. Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta. Members on which the recorded data is erasable can be produced.

公开(公告)号：EP0050047A2

公开(公告)日：1982-04-21

申请号：EP81304799.0

申请日：1981-10-14

申请人： Hitachi, Ltd.

发明人： Terao, Motoyasu ,  Horigome, Shinkichi ,  Mitsuya, Munehisa ,  Ota, Sakae ,  Shigematsu, Kazuo

IPC分类号： G11B7/24 ,  B41M5/24 ,  G11B7/26

CPC分类号： G11B7/243 ,  G11B7/2531 ,  G11B7/2532 ,  G11B7/2533 ,  G11B7/2578 ,  G11B2007/24304 ,  G11B2007/24306 ,  G11B2007/24308 ,  G11B2007/2431 ,  G11B2007/24312 ,  G11B2007/24314 ,  G11B2007/24316

摘要： An information recording member (1) comprising a substrate (6), and a thin film (5) formed on the substrate with or without an intermediate layer therebetween and irradiated with a recording beam (4) to make an aperture or recess in the thin film is disclosed in which the thin film is a crystalline film and has a composition expressed by a general formula Se x Te y M z , where x, y and z are given by formulae 0.02 ≤ x ≤ 0.35, 0.50 ≤ y ≤ 0.98 and 0 ≤ z ≤ 0.45, respectively, and M indicates at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, AI, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta, and in which the thin film does not deteriorate to such an extent as seen in conventional recording films when a time has elapsed, since the thin film is crystalline.

公开(公告)号：EP0866455B1

公开(公告)日：2005-11-23

申请号：EP98104169.2

申请日：1998-03-09

申请人： Hitachi, Ltd.

发明人： Fushimi, Tetsuya ,  Kaku, Toshimitsu ,  Ikeda, Tetsuya ,  Ishibashi, Toshiaki, 201, Haitsu-yoshihara ,  Shigematsu, Kazuo

IPC分类号： G11B20/10 ,  G11B27/30 ,  G11B27/19 ,  G11B7/00

CPC分类号： G11B27/3027 ,  G11B7/00375 ,  G11B7/24082 ,  G11B7/24085 ,  G11B20/10 ,  G11B20/1217 ,  G11B20/1258 ,  G11B20/1403 ,  G11B27/19