公开(公告)号：US5777981A

公开(公告)日：1998-07-07

申请号：US778313

申请日：1997-01-02

申请人： Toshihiro Sugaya ,  Yoshinori Honguh

发明人： Toshihiro Sugaya ,  Yoshinori Honguh

IPC分类号： G11B7/005 ,  G11B7/007 ,  G11B7/013 ,  G11B7/09 ,  G11B7/24 ,  H04N5/85 ,  H04N9/804

CPC分类号： H04N9/8042 ,  G11B7/0051 ,  G11B7/0938 ,  G11B7/24 ,  G11B7/24079 ,  G11B7/24085 ,  G11B7/007 ,  G11B7/24038 ,  H04N5/85

摘要： An optical disk with sectional trapezoidal pits comprising a substrate having information recorded by a plurality of pit trains formed thereon at a specified track pitch, and a reflective layer formed on the substrate, wherein the information is reproduced by being irradiated with light beam via an objective lens, the track pitch is set within the range of (0.72 to 0.8) .alpha..times..lambda./NA/1.14 .mu.m when a wavelength of the light beam is .mu.nm and a numerical aperture of the objective lens is NA, each of the pits is a multiplication ratio used to secure allowable disk tilt angles in an upper width within the range of (0.3 to 0.50) .alpha..times..lambda./NA/1.14 .mu.m, a bottom width within the range of (0.2 to 0.32) .alpha..times..lambda./NA/1.14 .mu.m and a depth within the range of (1/4.2.times..lambda./n) to (1/5.2 .mu./n) (n: refractive index of said substrate and .lambda.: a wavelength) and obtained by 2.623.times.10.sup.-7 .times.(d/.lambda.).sup.2 -1.706.times.10.sup.-4 (d.sub.s /.lambda.)+0.934, where d.sub.s is thickness of the substrate.

摘要翻译： 具有截面梯形凹坑的光盘，其包括具有以指定轨道间距在其上形成的多个凹坑列记录的信息的基板和形成在所述基板上的反射层，其中通过经由目标的光束照射所述信息而再现所述信息 当光束的波长为mu nm且物镜的数值孔径为NA时，轨道间距设定在（0.72〜0.8）α×λ/NA/1.14μm的范围内，每个凹坑 是用于确保在（0.3〜0.50）α×λ/NA/1.14μm的范围内的上部宽度中的允许的盘倾斜角的乘法比，底部宽度在（0.2〜0.32）的范围内的α×λ/ （1 / 4.2×λ/ n）至（1 /5.2μm/ n）范围内的深度（n：所述基底的折射率，λ：波长）的深度为2.623×10 ^ 7x（d /λ）2-1.706x10-4（ds /λ）+0.934，其中ds是基底的厚度。

公开(公告)号：US5602825A

公开(公告)日：1997-02-11

申请号：US541598

申请日：1995-10-10

申请人： Toshihiro Sugaya ,  Yoshinori Honguh

发明人： Toshihiro Sugaya ,  Yoshinori Honguh

IPC分类号： G11B7/005 ,  G11B7/007 ,  G11B7/013 ,  G11B7/09 ,  G11B7/24 ,  H04N5/85 ,  H04N9/804 ,  G11B7/26

CPC分类号： H04N9/8042 ,  G11B7/0051 ,  G11B7/0938 ,  G11B7/24 ,  G11B7/24079 ,  G11B7/24085 ,  G11B7/007 ,  G11B7/24038 ,  H04N5/85

摘要： An optical disk with sectional trapezoidal pits comprising a substrate having information recorded by a plurality of pit trains formed thereon at a specified track pitch, and a reflective layer formed on the substrate, wherein the information is reproduced by being irradiated with light beam via an objective lens, the track pitch is set within the range of (0.72 to 0.8).alpha..times..lambda./NA/1.14 .mu.m when a wavelength of the light beam is .mu. nm and a numerical aperture of the objective lens is NA, each of the pits is a multiplication ratio used to secure allowable disk tilt angles in an upper width within the range of (0.3 to 0.50).alpha..times..lambda./NA/1.14 .mu.m, a bottom width within the range of (0.2 to 0.32).alpha..times..lambda./NA/1.14 .mu.m and a depth within the range of (1/4.2.times..lambda./n) to (1/5.2 .lambda./n) (n: refractive index of said substrate and .lambda.: a wavelength) and obtained by 2.623.times.10.sup.-7 .times.(d/.lambda.).sup.2 -1.706.times.10.sup.-4 (d.sub.s /.lambda.)+0.934, where d.sub.s is thickness of the substrate).

摘要翻译： 具有截面梯形凹坑的光盘，其包括具有以指定轨道间距在其上形成的多个凹坑列记录的信息的基板和形成在所述基板上的反射层，其中通过经由目标的光束照射所述信息而再现所述信息 当光束的波长为mu nm且物镜的数值孔径为NA时，轨道间距设定在（0.72〜0.8）α×λ/NA/1.14μm的范围内，每个凹坑 是用于确保在（0.3〜0.50）α×λ/NA/1.14μm的范围内的上部宽度中的允许的盘倾斜角的乘法比，底部宽度在（0.2〜0.32）的范围内的α×λ/ （1 / 4.2×λ/ n）至（1 /5.2λ/ n）范围内的深度（n：所述衬底的折射率和λ：波长），并且通过2.623×10 -3 7x（d /λ）2-1.706x10-4（ds /λ）+0.934，其中ds是衬底的厚度）。

公开(公告)号：US4964009A

公开(公告)日：1990-10-16

申请号：US436035

申请日：1989-11-14

申请人： Kazunori Moriya ,  Nobuyuki Takagi ,  Toshihiro Sugaya ,  Norio Nakamura

发明人： Kazunori Moriya ,  Nobuyuki Takagi ,  Toshihiro Sugaya ,  Norio Nakamura

IPC分类号： G11B5/596 ,  G11B21/10 ,  G11B27/30

CPC分类号： G11B27/3027 ,  G11B5/59633 ,  G11B2220/20

摘要： A magnetic disk, which is used for recording and reproducing data with a read/write head. The magnetic disk has an index area with an index signal recorded therein and a plurality of servo sectors formed between a plurality of data areas subsequent to the index area. Each servo sector has a servo information area, in which a servo information pattern adapted for positioning the read/write head is formed, and first and second gap sections provided on the both sides of the servo information area for absorbing rotational variations of the disk.

摘要翻译： 磁盘，用于用读/写头记录和再现数据。 磁盘具有其中记录有索引信号的索引区域和形成在索引区域之后的多个数据区域之间的多个伺服扇区。 每个伺服扇区具有伺服信息区，其中形成适于定位读/写头的伺服信息模式，以及设置在伺服信息区两侧的用于吸收盘的旋转变化的第一和第二间隙部分。

公开(公告)号：US4896240A

公开(公告)日：1990-01-23

申请号：US259429

申请日：1988-10-18

申请人： Kazunori Moriya ,  Nobuyuki Takagi ,  Toshihiro Sugaya ,  Norio Nakamura

发明人： Kazunori Moriya ,  Nobuyuki Takagi ,  Toshihiro Sugaya ,  Norio Nakamura

IPC分类号： G11B5/596 ,  G11B21/10 ,  G11B27/30

CPC分类号： G11B27/3027 ,  G11B5/59633 ,  G11B2220/20

摘要： A magnetic disk, which is used for recording and reproducing data with a read/write head. The magnetic disk has an index area with an index signal recorded therein and a plurality of servo sectors formed between a plurality of data areas subsequent to the index area. Each servo sector has a servo information area, in which a servo information pattern adapted for positioning the read/write head is formed, and first and second gap sections provided on the both sides of the servo information area for absorbing rotational variations of the disk.

公开(公告)号：US4851933A

公开(公告)日：1989-07-25

申请号：US97220

申请日：1987-09-16

申请人： Toshihiro Sugaya ,  Yuji Sakai ,  Takehito Yamada

发明人： Toshihiro Sugaya ,  Yuji Sakai ,  Takehito Yamada

IPC分类号： G11B5/09 ,  G11B5/55 ,  G11B5/596 ,  G11B19/02 ,  G11B20/12 ,  G11B21/10 ,  G11B27/30

CPC分类号： G11B19/02 ,  G11B27/3027 ,  G11B5/5547 ,  G11B5/59633 ,  G11B2220/20

摘要： A magnetic disk adapted for use in a magnetic disk apparatus, which has a magnetic head with a pre-erase gap and a read/write gap with a predetermined spacing therebetween, and which uses a sector servo system to position the magnetic head onto a target track of the disk, is divided into a plurality of sectors each having an address field and a data field. A spacing gap having a length corresponding to the spacing between the erase and read/write gaps is formed at the beginning of each of the address and data fields. Servo information is provided at least in the spacing gap of the address field. The magnetic disk apparatus energizes the read/write and erase gaps at different timings, so that the initiation and termination of data erasing are performed prior to the initiation and termination of data writing, respectively.

摘要翻译： 一种适用于磁盘装置的磁盘，其具有具有预擦除间隙的磁头和其间具有预定间隔的读/写间隙，并且使用扇区伺服系统将磁头定位到目标上 磁盘的轨道被划分成多个扇区，每个扇区具有地址字段和数据字段。 在每个地址和数据字段的开始处形成具有与擦除和读/写间隙之间的间隔对应的长度的间隔。 至少在地址字段的间隔间隙中提供伺服信息。 磁盘装置在不同的定时激励读/写和擦除间隙，从而分别在数据写入的启动和终止之前执行数据擦除的启动和终止。

公开(公告)号：US4737869A

公开(公告)日：1988-04-12

申请号：US841820

申请日：1986-03-20

申请人： Toshihiro Sugaya ,  Nobuyuki Takagi ,  Norio Nakamura ,  Kazunori Moriya

发明人： Toshihiro Sugaya ,  Nobuyuki Takagi ,  Norio Nakamura ,  Kazunori Moriya

IPC分类号： G11B5/596 ,  G11B21/10 ,  G11B5/82

CPC分类号： G11B5/59638 ,  G11B5/59688

摘要： A magnetic disk comprises a data area and a single index servo sector area embedded in the data area. The servo sector has three or more servo information pattern sections formed side by side in the direction of data tracks in the data area. The servo information pattern sections each have a plurality of servo information bit cells formed in a predetermined pattern in a direction perpendicular to the direction of data tracks. The servo information bit cells are used to produce a position signal for positioning a read/write head. A servo system for positioning the read/write head averages a plurality of position signals obtained from the servo information pattern sections and uses the averaged position signal for positioning the read/write head.

摘要翻译： 磁盘包括嵌入在数据区中的数据区和单索引伺服扇区。 伺服扇区具有在数据区域中的数据轨道的方向上并排形成的三个或更多个伺服信息模式部分。 伺服信息模式部分各自具有在垂直于数据磁道方向的方向上以预定模式形成的多个伺服信息位单元。 伺服信息位单元用于产生用于定位读/写头的位置信号。 用于定位读/写头的伺服系统平均从伺服信息模式部分获得的多个位置信号，并使用平均位置信号来定位读/写头。

公开(公告)号：US4499511A

公开(公告)日：1985-02-12

申请号：US469144

申请日：1983-02-23

申请人： Toshihiro Sugaya

发明人： Toshihiro Sugaya

IPC分类号： G11B5/596 ,  G11B21/08

CPC分类号： G11B5/5965 ,  G11B21/083

摘要： A system for detecting a head position for use in a tracking servo system to accurately and quickly place a read-write head on a selected data track of a magnetic disk memory. The magnetic disk comprises data sectors and servo sectors embedded between the data sectors. A two-phase servo information pattern of a 4-track period is recorded on each of the servo sectors. Servo information is reproduced by the read-write head from each servo sector to produce two-phase first and second position signals which vary like a substantially trapezoidal waveform as a function of head position. A track on which the head is present among the tracks within one period of the servo information pattern is detected dependent on the polarity relation between the first and second position signals. Third and fourth position signals are formed which respectively correspond to the sum of and the difference between the first and second position signals. The present position of the head within the detected track is accurately obtained in accordance with either one of the third and fourth position signals which varies linearly in the detected track. A head actuator is controlled in accordance with a distance between the present position of the head and the selected track, so that the head is accurately and quickly positioned on the target track.

摘要翻译： 一种用于检测在跟踪伺服系统中使用的头部位置以便将读写头准确地并且快速地放置在磁盘存储器的选定数据轨道上的系统。 磁盘包括嵌入在数据扇区之间的数据扇区和伺服扇区。 在每个伺服扇区上记录有4个磁道周期的两相伺服信息模式。 伺服信息由读写头从每个伺服扇区再现，以产生两个相位的第一和第二位置信号，其变化类似于作为磁头位置的函数的大致梯形波形。 根据第一位置信号和第二位置信号之间的极性关系来检测磁头在伺服信息模式的一个周期内存在磁道的磁道。 形成第三和第四位置信号，其分别对应于第一和第二位置信号的和之和。 根据检测到的轨道线性变化的第三和第四位置信号中的任何一个，精确地获得磁头在检测轨道内的当前位置。 根据头部的当前位置和所选择的轨迹之间的距离来控制头致动器，使得头部准确而快速地定位在目标轨道上。