公开(公告)号：US5527661A

公开(公告)日：1996-06-18

申请号：US512131

申请日：1995-08-07

申请人： Nobuo Akahira ,  Eiji Ohno ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Yoshitaka Sakaue ,  Noboru Yamada

发明人： Nobuo Akahira ,  Eiji Ohno ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Yoshitaka Sakaue ,  Noboru Yamada

IPC分类号： G11B7/005 ,  G11B7/24 ,  G11B7/243

CPC分类号： G11B7/24 ,  G11B7/0051 ,  G11B7/243 ,  G11B2007/24312 ,  G11B2007/24314 ,  G11B2007/24316 ,  G11B7/00557 ,  G11B7/2534 ,  G11B7/2542 ,  G11B7/2595 ,  Y10S430/146

摘要： An optical recording medium according to the present invention includes a substrate, and a recording film formed on the substrate, when receiving a laser beam for recording, the recording film taking either a first structural state or a second structural state according to the intensity of the laser beam; when receiving a laser beam for reproducing, the recording film partially changing the optical phase of the laser beam for reproducing according to the structural state, thereby changing the intensity of the laser beam for reproducing, wherein the optical absorbance of the recording film in the first structural state is substantially equal to that of the recording film in the second structural state, and the refractive index of the recording film in the first structural state is substantially different from that of the recording film in the second structural state.

摘要翻译： 根据本发明的光记录介质包括基板和形成在基板上的记录膜，当接收用于记录的激光束时，根据记录膜的强度采用第一结构状态或第二结构状态的记录膜 激光束; 当接收到用于再现的激光束时，记录膜根据结构状态部分地改变用于再现的激光束的光学相位，由此改变用于再现的激光束的强度，其中记录膜在第一 结构状态基本上等于第二结构状态下的记录膜的结构状态，并且在第一结构状态下的记录膜的折射率与第二结构状态下的记录膜的折射率基本不同。

公开(公告)号：US5811217A

公开(公告)日：1998-09-22

申请号：US257470

申请日：1994-06-09

申请人： Nobuo Akahira ,  Kenichi Nagata ,  Eiji Ohno ,  Kenichi Nishiuchi ,  Noboru Yamada

发明人： Nobuo Akahira ,  Kenichi Nagata ,  Eiji Ohno ,  Kenichi Nishiuchi ,  Noboru Yamada

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/24 ,  G11B7/241 ,  G11B7/254 ,  G11B7/257

CPC分类号： G11B7/24 ,  G11B7/00454 ,  Y10S430/146

摘要： An optical information recording medium, which includes a substrate, and a recording thin film layer provided on the base material and adapted to form variation in an amount optically detectable by absorbing at least laser light so as to record information by partially varying the recording thin film layer and to reproduce the information by optically detecting the variation amount. The optical information recording medium further includes transparent layers each provided in contact with the recording thin film layer, and each of the transparent layers has optical thickness in which, in at least two different wavelengths .lambda., integral multiple of .lambda./2 is added to the thickness giving the large laser light absorption and large optical variation amount, respectively. More specifically, the optically detectable amount is of a reflectance factor variation, and in the different wavelengths .lambda.1 and .lambda.2, with respect to the thicknesses d1 and d2 of the transparent layers which give the optical characteristic more than 60% in the absorption, and more than 20% in the reflectance factor variation, the thickness of each transparent layer is arranged to be the thickness d having relation as represented by a following equation. d=d1+(.lambda.1/2).times.m=d2+(.lambda.2/2).times.1 (m, l: positive integer or zero).

摘要翻译： 一种光学信息记录介质，其包括基板和设置在基材上的记录薄膜层，并且适于通过至少吸收激光来形成光学上可检测的量的变化，以便通过部分地改变记录薄膜来记录信息 并通过光学检测变化量再现信息。 光学信息记录介质还包括各自设置成与记录薄膜层接触的透明层，并且每个透明层具有光学厚度，其中在至少两个不同波长λ中的λ/ 2的整数倍被添加到 分别赋予大的激光吸收和大的光学变化量的厚度。 更具体地说，光学上可检测的量是反射率变化，并且在不同波长λ1和λ2中，相对于在吸收中给出大于60％的光学特性的透明层的厚度d1和d2， 和反射系数变化大于20％时，每个透明层的厚度被设置为具有如以下等式表示的关系的厚度d = d1 +（λ+ E，fra 1/2 + EE）xm = d2 +（λ+ E，fra 2/2 + EE）x1（m，l：正整数或零）。

公开(公告)号：US5729513A

公开(公告)日：1998-03-17

申请号：US438501

申请日：1995-05-10

申请人： Nobuo Akahira ,  Kenichi Nishiuchi ,  Eiji Ohno ,  Kenichi Nagata ,  Noboru Yamada

发明人： Nobuo Akahira ,  Kenichi Nishiuchi ,  Eiji Ohno ,  Kenichi Nagata ,  Noboru Yamada

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/007 ,  G11B19/12 ,  G11B19/247 ,  G11B19/26 ,  G11B19/28 ,  G11B20/12

CPC分类号： G11B7/00454 ,  G11B19/26 ,  G11B7/0079 ,  G11B7/00745

摘要： A track on the disk is divided into plural concentric zones on the radial position thereof. During recording, the angular velocity varies according to the zones accessed for recording, and the disk is driven at a rotational velocity whereby the angular velocity is constant within any single zone but decreases as the radial position of the zone of the accessed track approaches the outside circumference of the disk. During reproducing, the disk is driven at a rotational velocity whereby the angular velocity is constant in all zones. The range of change in the relative linear velocity of the head to the track is thus smaller and the change in the recording conditions is less during recording. During reproducing, there is no delay time required for rotational control of the disk, and the desired track can be more quickly accessed.

摘要翻译： 磁盘上的轨道在其径向位置被分成多个同心区域。 在记录期间，角速度根据被记录的区域而变化，并且以旋转速度驱动盘，其中角速度在任何单个区域内是恒定的，但随着被访问的轨道的区域的径向位置接近外部而减小 盘的周长。 在再现期间，以旋转速度驱动盘，其中角速度在所有区域中是恒定的。 因此，磁头与磁道的相对线速度的变化范围变小，记录时记录条件的变化较小。 在再现期间，不需要用于盘的旋转控制的延迟时间，并且可以更快速地访问期望的轨道。

公开(公告)号：US5956308A

公开(公告)日：1999-09-21

申请号：US986492

申请日：1997-12-08

申请人： Nobuo Akahira ,  Kenichi Nishiuchi ,  Eiji Ohno ,  Kenichi Nagata ,  Noboru Yamada

发明人： Nobuo Akahira ,  Kenichi Nishiuchi ,  Eiji Ohno ,  Kenichi Nagata ,  Noboru Yamada

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/007 ,  G11B19/12 ,  G11B19/247 ,  G11B19/26 ,  G11B19/28 ,  G11B20/12

CPC分类号： G11B7/00454 ,  G11B19/26 ,  G11B7/0079 ,  G11B7/00745

摘要： A track on the disk is divided into plural concentric zones on the radial position thereof. During recording, the angular velocity varies according to the zones accessed for recording, and the disk is driven at a rotational velocity whereby the angular velocity is constant within any single zone but decreases as the radial position of the zone of the accessed track approaches the outside circumference of the disk. During reproducing, the disk is driven at a rotational velocity whereby the angular velocity is constant in all zones. The range of change in the relative linear velocity of the head to the track is thus smaller and the change in the recording conditions is less during recording. During reproducing, there is no delay time required for rotational control of the disk, and the desired track can be more quickly accessed.

摘要翻译： 磁盘上的轨道在其径向位置被分成多个同心区域。 在记录期间，角速度根据被记录的区域而变化，并且以旋转速度驱动盘，其中角速度在任何单个区域内是恒定的，但随着被访问的轨道的区域的径向位置接近外部而减小 盘的周长。 在再现期间，以旋转速度驱动盘，其中角速度在所有区域中是恒定的。 因此，磁头与磁道的相对线速度的变化范围变小，记录时记录条件的变化较小。 在再现期间，不需要用于盘的旋转控制的延迟时间，并且可以更快速地访问期望的轨道。

公开(公告)号：US5154957A

公开(公告)日：1992-10-13

申请号：US717815

申请日：1991-06-19

申请人： Noboru Yamada ,  Kenichi Nishiuchi ,  Eiji Ohno ,  Kenichi Nagata ,  Nobuo Akahira

发明人： Noboru Yamada ,  Kenichi Nishiuchi ,  Eiji Ohno ,  Kenichi Nagata ,  Nobuo Akahira

IPC分类号： G11B7/24

CPC分类号： G11B7/24 ,  Y10S428/913 ,  Y10S430/146 ,  Y10T428/24917 ,  Y10T428/24926

摘要： An optical information medium has a transparent substrate which has a pair of optically smooth faces; a recording thin film which is formed on one of the faces of the substrate and is subjected to an optically detectable change upon irradiation of a laser beam thereon to; and a reinforcing plate which has a mechanical strength larger than that of the substrate.

摘要翻译： 光学信息介质具有透明基板，该透明基板具有一对光学平滑面; 记录薄膜，其形成在所述基板的一个面上，并且在其上照射激光束时经受光学上可检测的变化; 以及具有比基板的机械强度大的机械强度的加强板。

公开(公告)号：US5768233A

公开(公告)日：1998-06-16

申请号：US778950

申请日：1997-01-06

申请人： Nobuo Akahira ,  Kenichi Nishiuchi ,  Eiji Ohno ,  Kenichi Nagata ,  Noboru Yamada

发明人： Nobuo Akahira ,  Kenichi Nishiuchi ,  Eiji Ohno ,  Kenichi Nagata ,  Noboru Yamada

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/007 ,  G11B19/12 ,  G11B19/247 ,  G11B19/26 ,  G11B19/28 ,  G11B20/12

CPC分类号： G11B7/00454 ,  G11B19/26 ,  G11B7/0079 ,  G11B7/00745

摘要： A track on the disk is divided into plural concentric zones on the radial position thereof. During recording, the angular velocity varies according to the zones accessed for recording, and the disk is driven at a rotational velocity whereby the angular velocity is constant within any single zone but decreases as the radial position of the zone of the accessed track approaches the outside circumference of the disk. During reproducing, the disk is driven at a rotational velocity whereby the angular velocity is constant in all zones. The range of change in the relative linear velocity of the head to the track is thus smaller and the change in the recording conditions is less during recording. During reproducing, there is no delay time required for rotational control of the disk, and the desired track can be more quickly accessed.

摘要翻译： 磁盘上的轨道在其径向位置被分成多个同心区域。 在记录期间，角速度根据被记录的区域而变化，并且以旋转速度驱动盘，其中角速度在任何单个区域内是恒定的，但随着被访问的轨道的区域的径向位置接近外部而减小 盘的周长。 在再现期间，以旋转速度驱动盘，其中角速度在所有区域中是恒定的。 因此，磁头与磁道的相对线速度的变化范围变小，记录时记录条件的变化较小。 在再现期间，不需要用于盘的旋转控制的延迟时间，并且可以更快速地访问期望的轨道。

公开(公告)号：US5424106A

公开(公告)日：1995-06-13

申请号：US45876

申请日：1993-04-15

申请人： Noboru Yamada ,  Nobuo Akahira ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Eiji Ohno ,  Shigeaki Furukawa

发明人： Noboru Yamada ,  Nobuo Akahira ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Eiji Ohno ,  Shigeaki Furukawa

IPC分类号： G11B7/006 ,  G11B7/24 ,  B32B3/00

CPC分类号： G11B7/006 ,  G11B7/24 ,  Y10S428/913 ,  Y10S430/146 ,  Y10T428/21 ,  Y10T428/31678

摘要： Phase-change-type optical recording medium comprises a first dielectric layer, a recording layer made of a phase change material, a second dielectric layer and a reflecting layer wherein the thicknesses of the first and second dielectric layers are determined for a given thickness of the recording layer so that the following conditions are satisfied;.DELTA.A+.DELTA.R.gtoreq.20% and .DELTA.A.gtoreq.5%wherein.DELTA.A=A(cry)-A(amo),A(cry), A(amo): light absorption rates of the recording layer in the crystal state and amorphous state, respectively,.DELTA.R=R(cry)-R(amo),R(cry) and R(amo): light reflection rates of the recording lates in the crystal state and amorphous state, respectively.

摘要翻译： 相变型光学记录介质包括第一介质层，由相变材料制成的记录层，第二介电层和反射层，其中确定第一和第二介电层的厚度为给定的厚度 记录层，以满足以下条件; DELTA A + DELTA R> / = 20％和DELTA A> / = 5％其中DELTA A = A（cry）-A（amo），A（cry），A（amo）：记录层的光吸收率 晶体状态和非晶态分别为：晶体状态和非晶态的记录层的光反射率分别为：DELTA R = R（cry）-R（amo），R（cry）和R（amo）

公开(公告)号：US5635267A

公开(公告)日：1997-06-03

申请号：US264496

申请日：1994-06-23

申请人： Noboru Yamada ,  Kenichi Nishiuchi ,  Shigeaki Furukawa ,  Nobuo Akahira ,  Eiji Ohno ,  Kenichi Nagata ,  Rie Kojima

发明人： Noboru Yamada ,  Kenichi Nishiuchi ,  Shigeaki Furukawa ,  Nobuo Akahira ,  Eiji Ohno ,  Kenichi Nagata ,  Rie Kojima

IPC分类号： G11B7/007 ,  B32B3/02

CPC分类号： G11B7/0079 ,  G11B7/24079 ,  Y10S428/913

摘要： In an optical information recording medium such that a recording layer undergoing an optically detectable phase change by absorbing a laser beam is formed on a transparent substrate having geometrically concavo-convex groove tracks concentrically or spirally formed on its surface, the shapes of the groove tracks are variably determined continuously or stepwise depending on the material of the substrate, the structure of the recording layer, and the radial locations of the tracks so that the thermal diffusivity of heat generated in the recording layer becomes larger in an inner part than in an outer part whereby the differences of recording characteristics between in an inner part and in an outer part are suppressed, and the effective recording area is enlarged. There is also disclosed an optical information recording medium having outer zone in which the groove width decreases monotonically or stepwise as recording radius decreases and inner zone in which the land width increases monotonically or stepwise as recording radius increases.

摘要翻译： 在光学信息记录介质中，使得通过吸收激光束经历可光学检测的相位变化的记录层在其表面上同心地或螺旋地形成有几何凹凸槽轨道的透明基板上形成，凹槽轨迹的形状为 根据基板的材料，记录层的结构和轨道的径向位置可变地确定连续或逐步地确定，使得在记录层中产生的热的热扩散率在内部比在外部部分变大 从而抑制了内部和外部之间的记录特性的差异，并且有效记录区域被扩大。 还公开了一种具有外部区域的光学信息记录介质，其中随着记录半径减小，凹槽宽度逐渐减小或逐步减小，并且随着记录半径增加，平面宽度单调或逐步增加的内部区域。

公开(公告)号：US5545454A

公开(公告)日：1996-08-13

申请号：US399215

申请日：1995-03-06

申请人： Noboru Yamada ,  Nobuo Akahira ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Eiji Ohno ,  Shigeaki Furukawa

发明人： Noboru Yamada ,  Nobuo Akahira ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Eiji Ohno ,  Shigeaki Furukawa

IPC分类号： G11B7/006 ,  G11B7/24 ,  B32B3/00

CPC分类号： G11B7/006 ,  G11B7/24 ,  Y10S428/913 ,  Y10S430/146 ,  Y10T428/21 ,  Y10T428/31678

摘要： Phase-change-type optical recording medium comprises a first dielectric layer, a recording layer made of a phase change material, a second dielectric layer and a reflecting layer wherein the thicknesses of the first and second dielectric layers are determined for a given thickness of the recording layer so that the following conditions are satisfied;.DELTA.A+.DELTA.R.gtoreq.20% and .DELTA.A.gtoreq.5%wherein.DELTA.A=A(cry)-A(amo),A(cry), A(amo): light absorption rates of the recording layer in the crystal state and amorphous state, respectively,.DELTA.R=R(cry)-R(amo),R(cry) and R(amo): light reflection rates of the recording lates in the crystal state and amorphous state, respectively.

公开(公告)号：US5412626A

公开(公告)日：1995-05-02

申请号：US36198

申请日：1993-03-23

申请人： Eiji Ohno ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Noboru Yamada ,  Nobuo Akahira

发明人： Eiji Ohno ,  Kenichi Nishiuchi ,  Kenichi Nagata ,  Noboru Yamada ,  Nobuo Akahira

IPC分类号： G11B7/0045 ,  G11B7/006 ,  G11B7/125 ,  G11B11/105 ,  G11B11/00 ,  G11B7/00

CPC分类号： G11B7/126 ,  G11B11/10521 ,  G11B11/1053 ,  G11B11/10595 ,  G11B7/0045 ,  G11B7/006

摘要： In a method of recording optical information, one of correcting ways for correcting the pulse waveform of the input signal to be recorded is selected depending on change in relative velocity between the optical information recording medium and the laser beam spot; and thereafter the laser beam output power is modulated in a range between an erasing level and a recording level in accordance with the corrected pulse waveform of the modulated input signal. Then a digital input signal corrected by modulation in pulse width is overwritten onto an optical information recording medium with a single laser beam spot by forming recording marks corresponding to the input pulse signal.

摘要翻译： 在记录光学信息的方法中，根据光学信息记录介质和激光束点之间的相对速度的变化来选择用于校正要记录的输入信号的脉冲波形的校正方法之一; 之后根据调制输入信号的校正脉冲波形将激光束输出功率调制在擦除电平和记录电平之间的范围内。 然后通过形成与输入脉冲信号相对应的记录标记，通过脉冲宽度调制校正的数字输入信号被重写到具有单个激光束点的光学信息记录介质上。