公开(公告)号：US5481526A

公开(公告)日：1996-01-02

申请号：US266719

申请日：1994-06-28

申请人： Shizuo Nagata ,  Yasuhiro Suzuki ,  Tutomu Tabata ,  Masahiro Takahashi

发明人： Shizuo Nagata ,  Yasuhiro Suzuki ,  Tutomu Tabata ,  Masahiro Takahashi

IPC分类号： G11B7/09 ,  G11B7/00

CPC分类号： G11B7/0941 ,  G11B7/094

摘要： An optical pickup emits a light beam onto a recording medium and outputs, in response to a reflection from the medium, a first and a second signal for controlling focusing servo control and tracking servo control, respectively. A signal generating section generates a focus error signal and a tracking error signal in response to the first and second signals, respectively. A driving section is responsive to the output of the signal generating section for outputting a first and a second drive current assigned to focusing and tracking, respectively. An actuator moves the pickup in a focusing direction and a tracking direction by the first and second drive currents, respectively. An adjusting section detects two values close to the maximum and minimum values of the tracking error signal at the start of the focusing servo control and adjusts the gain of the second signal on the basis of a difference between the detected values. Alternatively, the offset of the second signal may be adjusted by the sum of the two detected values. Futher, the offset of the first signal may be adjusted by a focus offset occurring when the amplitude of the first and second signals appearing after the start of the focusing servo control or the amplitude of a third signal also outputted by the pickup and representative of recorded data and appearing after the start of tracking servo is close to the maximum.

摘要翻译： 光学拾取器将光束发射到记录介质上，并响应于来自介质的反射而分别输出用于控制聚焦伺服控制和跟踪伺服控制的第一和第二信号。 信号产生部分分别响应于第一和第二信号产生聚焦误差信号和跟踪误差信号。 驱动部分响应于信号产生部分的输出，分别输出分配给聚焦和跟踪的第一和第二驱动电流。 执行器分别通过第一驱动电流和第二驱动电流沿着聚焦方向和跟踪方向移动拾取器。 调整部分检测在聚焦伺服控制开始时接近跟踪误差信号的最大值和最小值的两个值，并且基于检测值之间的差调整第二信号的增益。 或者，可以通过两个检测值的和来调整第二信号的偏移。 此外，第一信号的偏移可以通过在聚焦伺服控制开始之后出现的第一和第二信号的幅度或由拾取器输出的第三信号的振幅的振幅发生的聚焦偏移来调节，并且代表记录 跟踪伺服开始后出现的数据接近最大值。

公开(公告)号：US5351224A

公开(公告)日：1994-09-27

申请号：US112655

申请日：1993-08-27

申请人： Shizuo Nagata ,  Yasuhiro Suzuki ,  Tutomu Tabata ,  Masahiro Takahashi

发明人： Shizuo Nagata ,  Yasuhiro Suzuki ,  Tutomu Tabata ,  Masahiro Takahashi

IPC分类号： G11B7/09

CPC分类号： G11B7/0941 ,  G11B7/094

摘要： An optical pickup emits a light beam onto a recording medium and outputs, in response to a reflection from the medium, a first and a second signal for controlling focusing servo control and tracking servo control, respectively. A signal generating section generates a focus error signal and a tracking error signal in response to the first and second signals, respectively. A driving section is responsive to the output of the signal generating section for outputting a first and a second drive current assigned to focusing and tracking, respectively. An actuator moves the pickup in a focusing direction and a tracking direction by the first and second drive currents, respectively. An adjusting section detects two values close to the maximum and minimum values of the tracking error signal at the start of the focusing servo control and adjusts the gain of the second signal on the basis of a difference between the detected values. Alternatively, the offset of the second signal may be adjusted by the sum of the two detected values. Further, the offset of the first signal may be adjusted by a focus offset occurring when the amplitude of the first and second signals appearing after the start of the focusing servo control or the amplitude of a third signal also outputted by the pickup and representative of recorded data and appearing after the start of tracking servo is close to the maximum.

摘要翻译： 光学拾取器将光束发射到记录介质上，并响应于来自介质的反射而分别输出用于控制聚焦伺服控制和跟踪伺服控制的第一和第二信号。 信号生成部分分别响应于第一和第二信号产生聚焦误差信号和跟踪误差信号。 驱动部分响应于信号产生部分的输出，分别输出分配给聚焦和跟踪的第一和第二驱动电流。 执行器分别通过第一驱动电流和第二驱动电流沿着聚焦方向和跟踪方向移动拾取器。 调整部分检测在聚焦伺服控制开始时接近跟踪误差信号的最大值和最小值的两个值，并且基于检测值之间的差调整第二信号的增益。 或者，可以通过两个检测值的和来调整第二信号的偏移。 此外，可以通过在聚焦伺服控制开始之后出现的第一和第二信号的幅度或由拾取器输出的第三信号的幅度的时候发生的聚焦偏移来调整第一信号的偏移，并且代表记录 跟踪伺服开始后出现的数据接近最大值。

公开(公告)号：US5231618A

公开(公告)日：1993-07-27

申请号：US831984

申请日：1992-02-06

申请人： Tsutomu Tabata ,  Shizuo Nagata ,  Yasuhiro Suzuki

发明人： Tsutomu Tabata ,  Shizuo Nagata ,  Yasuhiro Suzuki

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/09 ,  G11B7/095 ,  G11B27/10

CPC分类号： G11B7/0948 ,  G11B7/0901 ,  G11B7/0908 ,  G11B7/0941

摘要： An optical disc system is provided with a focusing error signal generator for detecting any focusing error from light reflected by an optical disc and outputting a focusing error signal; a driver for outputting a focusing drive current on the basis of the focusing error signal; and an actuator for shifting an optical pickup in a focusing direction in accordance with the focusing drive signal. The optical disc system also has a signal detection and processing unit for detecting each index point (ID) on the optical disc and generating an index gate signal indicating an address between the index point and another index point next to the first-mentioned index point in the tracking direction; and an inter-ID holder for holding, based on the index gate signal, the focusing error signal at a signal level right before the first-mentioned index point.

摘要翻译： 光盘系统设置有聚焦误差信号发生器，用于从光盘反射的光中检测聚焦误差并输出聚焦误差信号; 用于基于聚焦误差信号输出聚焦驱动电流的驱动器; 以及用于根据聚焦驱动信号沿聚焦方向移动光学拾取器的致动器。 光盘系统还具有用于检测光盘上的每个索引点（ID）的信号检测和处理单元，并产生一个索引门信号，该索引门信号指示索引点与第一个提到的索引点之间的另一索引点之间的地址 跟踪方向; 以及ID间保持器，用于基于所述索引门信号，在所述第一提及的索引点之前的信号电平处保持所述聚焦误差信号。

公开(公告)号：US5097456A

公开(公告)日：1992-03-17

申请号：US459799

申请日：1990-04-16

申请人： Katsuhide Tanoshima ,  Yasuo Shimizu ,  Minoru Ohtsuka ,  Masahiro Takahashi ,  Shizuo Nagata

发明人： Katsuhide Tanoshima ,  Yasuo Shimizu ,  Minoru Ohtsuka ,  Masahiro Takahashi ,  Shizuo Nagata

IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/12

CPC分类号： G11B7/12 ,  G11B7/08582 ,  G11B7/09

摘要： An optical head for use in an optical disk device holds individually an objective lens, an optical path converting prism and first and second relay lenses that are movably only in the direction of tracking. The objective lens and other members can be moved for the purpose of correcting any possible displacement of a track position of a light beam due to any eccentric arrangement involved and of a focusing position of the light beam due to a change in a relative distance between the lenses and due to surface deflection of a disk. The optical head thus allows easy assembly and adjustment thereof with simplified structure, higher resonance frequency, and high speed response.

公开(公告)号：US4813007A

公开(公告)日：1989-03-14

申请号：US153724

申请日：1988-02-08

申请人： Katsuhide Tanoshima ,  Yasuhiro Suzuki ,  Shizuo Nagata ,  Yasuo Shimizu

发明人： Katsuhide Tanoshima ,  Yasuhiro Suzuki ,  Shizuo Nagata ,  Yasuo Shimizu

IPC分类号： G11B11/105 ,  H01F7/20 ,  G01D15/00

CPC分类号： H01F7/20 ,  G11B11/10532 ,  G11B11/10558 ,  G11B11/1056

摘要： An external magnetic field generating device includes a pole piece mounted on a face of a magnetic plate, and a coil which is in contact with the face of the magnetic plate, the coil being wound flatly around the pole piece so that it spreads out radially. The coil generates a magnetic field through the pole piece when an electric current passes through the coil, the pole piece is projectable beyond the face of the coil opposite the magnetic plate.

公开(公告)号：US5195074A

公开(公告)日：1993-03-16

申请号：US740379

申请日：1991-08-05

申请人： Katsushide Tanoshima ,  Minoru Ohtsuka ,  Shizuo Nagata ,  Masahiro Takahashi ,  Yasuo Shimizu

发明人： Katsushide Tanoshima ,  Minoru Ohtsuka ,  Shizuo Nagata ,  Masahiro Takahashi ,  Yasuo Shimizu

IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/12

CPC分类号： G11B7/12 ,  G11B7/08582 ,  G11B7/09

摘要： In an optical head apparatus for recording or reproducing information onto or from an optical disc, a carriage is movable along a guide shaft extending in a direction parallel with the radial direction of the optical disc, and an armature is mounted on the carriage so that it can rotate about a pivotal axis perpendicular to the surface of the optical disc. An objective lens is fixed to the armature and positioned to traverse the tracks on the optical disc when the armature rotates. Guide yokes extend in parallel with the guide shaft. Tracking and carriage-servo coils are fixed to the armature and have a hollow through which the guide yokes loosely extend. A magnetic field means creates magnetic lines of force perpendicular to the longitudinal direction of the guide yokes and parallel with the surface of the optical disc. A drive circuit supplies currents to the tracking and carriage-servo coils in such directions as to produce electromagnetic forces in parallel with each other thereby driving the armature along the guide yokes or in such directions as to produce electromagnetic forces in antiparallel with each other to rotate the armature about the pivotal axis.

摘要翻译： 在用于在光盘上记录或再现信息的光学头装置中，滑架可沿着与光盘的径向平行的方向延伸的引导轴移动，并且电枢安装在滑架上，使得它 可围绕垂直于光盘表面的枢转轴旋转。 当电枢旋转时，物镜固定到电枢并定位成横过光盘上的轨道。 引导轭与引导轴平行延伸。 跟踪和托架伺服线圈固定在电枢上，并具有中空的引导线松动地延伸通过该中空。 磁场意味着产生垂直于引导轭的纵向方向的磁力线并与光盘的表面平行。 驱动电路将电流提供给跟踪和托架伺服线圈，以便产生彼此平行的电磁力，从而沿着引导轭驱动电枢，或沿着这样的方向驱动电枢，以产生彼此反平行的电磁力，以使其旋转 电枢围绕枢转轴线。