公开(公告)号：US5189650A

公开(公告)日：1993-02-23

申请号：US617803

申请日：1990-11-26

Applicant: Tetsu Watanabe ,  Tamotsu Yamagami ,  Tetsuji Kawashima

Inventor： Tetsu Watanabe ,  Tamotsu Yamagami ,  Tetsuji Kawashima

IPC: G11B11/10 ,  G11B11/105 ,  G11B20/10

CPC classification number: G11B20/10203 ,  G11B11/10515 ,  G11B20/10037

Abstract: In a magneto-optical signal reproducing apparatus for reading out a signal recorded on a magneto-optical recording medium by an optical pickup device so as to provide a magneto-optical signal which, in turn, is level-discriminated on the basis of a reference level to reproduce data therefrom, the reference level is controlled in accordance with a level of an in-phase signal component provided from the optical pickup device, thereby enabling stable data reproduction.

公开(公告)号：US5781518A

公开(公告)日：1998-07-14

申请号：US914203

申请日：1997-08-18

Applicant: Tamotsu Yamagami ,  Tetsu Watanabe ,  Yoichiro Sako

Inventor： Tamotsu Yamagami ,  Tetsu Watanabe ,  Yoichiro Sako

IPC: G11B7/0037 ,  G11B7/007 ,  G11B7/09 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/14 ,  G11B20/18 ,  G11B27/19 ,  G11B27/30

CPC classification number: G11B20/10027 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10595 ,  G11B20/10009 ,  G11B20/10222 ,  G11B20/1258 ,  G11B20/1403 ,  G11B20/1816 ,  G11B27/19 ,  G11B27/3027 ,  G11B7/0037 ,  G11B7/00745 ,  G11B7/0938 ,  G11B2220/20 ,  G11B2220/2525

Abstract: A method of recording data on a disc on a disc pre-recorded with servo control data, with the servo control data being pre-recorded in the form of convex and concave pits at intervals along substantially concentric tracks, the servo control data recorded in alignment in a diametrical direction of the disc. The method includes the steps of dividing the disc into a plurality of zones in the radial direction, dividing the tracks into a plurality segments such that there is an equal number of segments in each interval between adjacent pre-recorded servo control data. The method further includes the step of recording reference data on at least one segment of the plurality of segments in each interval between adjacent servo control data, with the reference data being utilized to adjust a gain and a phase of a read-out clock upon reproduction of the disc. The method further includes the step of recording digital data on at least one segment of the plurality of segments in each interval between adjacent servo control data, with the digital data being recorded at a constant angular velocity and with the constant angular velocity being different for each zone.

Abstract translation: 在预先记录有伺服控制数据的盘上的盘上记录数据的方法，其中伺服控制数据以基本上同心的轨道间隔地以凸凹坑的形式预先记录，伺服控制数据以对准的方式记录 在盘的直径方向。 该方法包括以下步骤：将盘分成径向的多个区域，将轨道分成多个段，使得在相邻的预先记录的伺服控制数据之间的每个间隔中存在相等数量的段。 该方法还包括在相邻伺服控制数据之间的每个间隔中的多个段的至少一个段上记录参考数据的步骤，该参考数据用于在再现时调整读出时钟的增益和相位 的光盘。 该方法还包括在相邻的伺服控制数据之间的每个间隔的多个段的至少一个段上记录数字数据的步骤，数字数据以恒定的角速度被记录，并且恒定的角速度对于每个 区。

公开(公告)号：US5170385A

公开(公告)日：1992-12-08

申请号：US603312

申请日：1990-10-25

Applicant: Susumu Senshu ,  Tamotsu Yamagami ,  Shigeaki Wachi ,  Tetsu Watanabe

Inventor： Susumu Senshu ,  Tamotsu Yamagami ,  Shigeaki Wachi ,  Tetsu Watanabe

IPC: G11B20/12 ,  G11B7/00 ,  G11B7/004 ,  G11B7/007 ,  G11B7/24

CPC classification number: G11B7/00745

Abstract: A recording medium in which one sector is divided into a plurality of segments and information is recorded in the segments, uses a reproducing method in which information is reproduced optically from this medium. The recording medium has an area in which no embossed pit is formed beforehand comprising at least one segment among a plurality of segments, and embossed pits indicative of the head of the sector which is formed in correspondence to the head position of the sector. Clocks are reproduced by detecting the pit for clock reproduction on the basis of the area in the recording medium in which no embossed pit is formed beforehand. The head position of the sector is detected by detecting whether the pit indicative of the head of the sector is present or not at a timing based on the clock. With this method, the head position of the sector can be detected correctly even if information was recorded by a modulating system in which all signal patterns can exist according to the modulating rule.

公开(公告)号：US5592465A

公开(公告)日：1997-01-07

申请号：US348751

申请日：1994-12-02

Applicant: Tamotsu Yamagami ,  Tetsu Watanabe ,  Yoichiro Sako

Inventor： Tamotsu Yamagami ,  Tetsu Watanabe ,  Yoichiro Sako

IPC: G11B7/00 ,  G11B7/0037 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/013 ,  G11B7/09 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/14 ,  G11B20/18 ,  G11B23/36 ,  G11B27/19 ,  G11B27/30 ,  G11B7/24

CPC classification number: G11B7/0037 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10595 ,  G11B20/10009 ,  G11B20/10027 ,  G11B20/10222 ,  G11B20/1258 ,  G11B20/1403 ,  G11B20/1816 ,  G11B27/19 ,  G11B27/3027 ,  G11B7/00745 ,  G11B7/0938 ,  G11B2220/20 ,  G11B2220/2525

Abstract: In a disc recording method in which a disc on which servo control data is recorded in advance in alignment with a radial direction is divided into a plurality of zones in the radial direction and digital data having different clock rates are recorded on every zone, reference data for detecting the quality of a recording signal is recorded on a whole recording data area of one segment segmented by at least said servo control data. Therefore, the reproduction of data recorded in the zone-recording fashion can be controlled with ease in any zone.

Abstract translation: 在其中预先将伺服控制数据与径向对准地记录在其上的盘被记录在径向方向上的多个区域中，并且在每个区域上记录具有不同时钟速率的数字数据的参考数据 用于检测记录信号的质量的数据被记录在由至少所述伺服控制数据分段的一个段的整个记录​​数据区域上。 因此，可以容易地在任何区域中控制以区域记录方式记录的数据的再现。

公开(公告)号：US5559774A

公开(公告)日：1996-09-24

申请号：US795724

申请日：1991-11-21

Applicant: Tetsu Watanabe ,  Tamotsu Yamagami ,  Yoshiyuki Urakawa

Inventor： Tetsu Watanabe ,  Tamotsu Yamagami ,  Yoshiyuki Urakawa

IPC: G11B7/005 ,  G11B20/10 ,  G11B5/09

CPC classification number: G11B7/005 ,  G11B20/10009

Abstract: An apparatus reproducing signals recorded on an optical disc rotated at a constant angular velocity. The apparatus employs a binary detector for forming digital data by comparing the reproduced signal with a predetermined threshold level, and a ternary detector for forming reproduced data from two series of digital data detected by comparing the reproduced signal with two different threshold levels of predetermined values. The reproduced data from an outer portion of the disc is detected by the binary detector, while the reproduced data from an inner portion of the disc is detected by the ternary detector. The playback output is selectively switched in response to an address signal of a specific track where the phase margin of the reproduced data detected by the binary detector and the phase margin of the reproduced data detected by the ternary detector becomes substantially equal to each other.

Abstract translation: 记录在以恒定角速度旋转的光盘上的信号的装置。 该装置采用二进制检测器，用于通过将再现信号与预定阈值电平进行比较来形成数字数据;以及三进制检测器，用于通过将再现信号与预定值的两个不同阈值电平进行比较而检测的两个数字数据序列形成再现数据。 来自盘的外部的再现数据由二进制检测器检测，而来自盘的内部的再现数据由三元检测器检测。 响应于由二进制检测器检测到的再现数据的相位裕度和由三元检测器检测到的再现数据的相位裕度彼此基本相等的特定轨道的地址信号来选择性地切换回放输出。

公开(公告)号：US5784343A

公开(公告)日：1998-07-21

申请号：US761755

申请日：1991-09-16

Applicant: Tetsu Watanabe ,  Tamotsu Yamagami

Inventor： Tetsu Watanabe ,  Tamotsu Yamagami

IPC: G11B11/10 ,  G11B7/135 ,  G11B11/105 ,  G11B11/14 ,  G11B13/04

CPC classification number: G11B11/10532 ,  G11B11/10552 ,  G11B11/10584 ,  G11B11/10597

Abstract: A magneto-optical recording and/or reproducing apparatus having a magnetic head and first and second optical systems for recording on and/or reproducing from first and second magneto-optical media. The first optical system has a first objective lens, and the second optical system has a second objective lens whose numerical aperture differs from that of the first objective lens. The magnetic head is arranged near the second objective lens. The first and second optical systems are arranged such that the respective one of the first and second magneto-optical media which is currently being subject to recording or reproducing is positioned between the first and second optical systems.

Abstract translation: PCT No.PCT / JP91 / 00112 Sec。 371日期1991年9月16日 102（e）1991年9月16日PCT 1991年1月30日PCT PCT。 公开号WO91 / 11806 日期1991年8月8日一种具有磁头和用于在第一和第二磁光介质上记录和/或再现的第一和第二光学系统的磁光记录和/或再现装置。 第一光学系统具有第一物镜，第二光学系统具有与第一物镜的数值孔径不同的第二物镜。 磁头布置在第二物镜附近。 第一和第二光学系统被布置成使得当前正在进行记录或再现的第一和第二磁光介质中的相应一个位于第一和第二光学系统之间。

公开(公告)号：US5488590A

公开(公告)日：1996-01-30

申请号：US301045

申请日：1994-09-06

Applicant: Tetsu Watanabe ,  Tamotsu Yamagami

Inventor： Tetsu Watanabe ,  Tamotsu Yamagami

IPC: G11B11/10 ,  G11B11/105 ,  G11B7/00 ,  G11B11/00

CPC classification number: G11B11/10513 ,  G11B11/10515 ,  G11B11/10528 ,  G11B11/10584 ,  G11B11/10576

Abstract: A magneto-optical recording and reproducing system in a magneto-optical disk capable of being overwrite recorded by applying a magnetic field to a photo-sensitive recording layer and irradiating a laser beam onto the recording layer. A track pitch and a diameter of the laser beam are set so that recording tracks to be formed by irradiation of the laser beam overlap, each other between adjacent tracks. Accordingly, data recording density of the magneto-optical disk, especially in a radial direction thereof, can be increased.

Abstract translation: 能够通过向光敏记录层施加磁场并且将激光照射到记录层上而能够重写的磁光盘中的磁光记录和再现系统。 激光束的轨道间距和直径被设定为使得通过激光束的照射形成的记录轨迹彼此重叠在相邻轨道之间。 因此，可以增加磁光盘的数据记录密度，特别是在其径向方向上的数据记录密度。

公开(公告)号：US5287334A

公开(公告)日：1994-02-15

申请号：US808077

申请日：1991-12-11

Applicant: Kietsu Iwabuchi ,  Koji Sasaki ,  Tetsu Watanabe ,  Tamotsu Yamagami ,  Yoshio Aoki

Inventor： Kietsu Iwabuchi ,  Koji Sasaki ,  Tetsu Watanabe ,  Tamotsu Yamagami ,  Yoshio Aoki

IPC: G11B11/105 ,  G11B5/127

CPC classification number: G11B11/10584 ,  G11B11/10532 ,  G11B11/10536 ,  G11B11/10554

Abstract: A magneto-optical pickup apparatus includes an objective lens for focusing a laser beam emitted from a laser device onto a magneto-optical recording medium, driving coils, on which the objective lens is mounted, for driving the objective lens in focusing and tracking directions, and a plate arranged at an end portion of the driving coils between the objective lens and the magneto-optical recording medium. The plate is formed with a coil pattern for generating a magnetic field to be applied to the magneto-optical recording medium, and can allow a laser beam transmitted through the objective lens to pass therethrough.

Abstract translation: 磁光拾取装置包括用于将从激光装置发射的激光束聚焦到磁光记录介质上的物镜，其上安装有物镜的驱动线圈，用于在聚焦和跟踪方向上驱动物镜， 以及布置在物镜和磁光记录介质之间的驱动线圈的端部处的板。 板形成有用于产生要施加到磁光记录介质的磁场的线圈图案，并且可以允许透过物镜的激光束通过。

公开(公告)号：US5200935A

公开(公告)日：1993-04-06

申请号：US608744

申请日：1990-11-05

Applicant: Tetsu Watanabe ,  Tamotsu Yamagami

Inventor： Tetsu Watanabe ,  Tamotsu Yamagami

IPC: G11B11/10 ,  G11B11/105

CPC classification number: G11B11/10513 ,  G11B11/1053

Abstract: In a recording apparatus employing a magneto-optical effect, and in which a light beam irradiates a region of a magneto-optical disc while a magnetic field acts on the disc at such region and is modulated by coded data in accordance with a predetermined modulation system; the light beam is intermittently energized by drive pulses, and the energizing of the light beam is inhibited at times corresponding to transitions in the coded data when the ratio Tmin/Tw is greater than 1, in which Tmin is the minimum length between transitions in the coded data and Tw is a window margin for the modulation system employed for modulating the magnetic field.

公开(公告)号：US5182734A

公开(公告)日：1993-01-26

申请号：US465123

申请日：1990-02-20

Applicant: Tetsu Watanabe ,  Tetsuji Kawashima ,  Goro Fujita

Inventor： Tetsu Watanabe ,  Tetsuji Kawashima ,  Goro Fujita

IPC: G11B11/10 ,  G11B11/105 ,  G11B19/14 ,  G11B33/14

CPC classification number: G11B33/144 ,  G11B11/10508 ,  G11B11/10513 ,  G11B11/1053 ,  G11B11/10595 ,  G11B19/14

Abstract: In a magneto-optical recording apparatus, in which light spots are sequentially formed on a magneto-optical disk at the timing of a predetermined reference clock signal while a modulating magnetic field, which is reversed in polarity as a function of record data in synchronism with the reference clock signals, is applied to the disk for magnetically recording the record data thereon; the timing of polarity reversal of the modulating magnetic field with respect to the reference clock signal is delayed as a function of the magnetic and/or temperature characteristics of the magneto-optical disk to permit a magnetized domain to be formed at the correct position with respect to the timing of the reference clock signal. The intensity and/or duration of intermittent energizing of the light beam is controlled as a function of the ambient temperature of the magneto-optical disk and/or the radial sweeping position of the light spot to permit each magnetized domain to be formed at the correct position with respect to the timing of the reference clock signal.

Abstract translation: PCT No.PCT / JP89 / 00612 Sec。 371日期1990年2月20日 102（e）1990年2月20日PCT PCT 1991年6月19日PCT公布。 WO89 / 12889 PCT公开号 日期为1989年12月28日。在磁光记录装置中，在预定的基准时钟信号的定时将光斑依次形成在磁光盘上，同时将极性反转的调制磁场作为 将与参考时钟信号同步的记录数据的功能应用于用于在其上磁记录记录数据的磁盘; 相对于参考时钟信号的调制磁场的极性反转的定时被延迟为磁光盘的磁性和/或温度特性的函数，以允许磁化域形成在与 到参考时钟信号的定时。 光束的间歇激励的强度和/或持续时间被控制为光磁盘的环境温度和/或光斑的径向扫掠位置的函数，以允许每个磁化域形成在正确的 相对于参考时钟信号的定时的位置。