公开(公告)号：US07605909B2

公开(公告)日：2009-10-20

申请号：US11405450

申请日：2006-04-18

申请人： Atsushi Yamaguchi ,  Yoshihisa Suzuki ,  Masato Yamada ,  Shuichi Ichiura

发明人： Atsushi Yamaguchi ,  Yoshihisa Suzuki ,  Masato Yamada ,  Shuichi Ichiura

IPC分类号： G01C3/08

CPC分类号： G01S7/481 ,  G01S7/497 ,  G01S17/936

摘要： An object of the present invention is to provide a detection device which does not cause the false detection by receiving laser light from an oncoming car.The pulse laser light modulated with a modulation pattern set every target position is irradiated at the target position from a laser irradiation portion. DSP (Digital Signal Processor) decides that there is an obstacle at the target position only when the modulation pattern of the pulse laser light emitted from the laser emitting portion matches with the modulation pattern of the pulse laser light received by the laser receiving portion. It is suppressed that the detection device misdetects the conditions of the target position when receiving laser light from an oncoming car or the like because modulation pattern of laser light from own does not match with modulation pattern of laser light from the oncoming car or the like.

摘要翻译： 本发明的目的是提供一种通过接收来自迎面而来的轿厢的激光不会引起错误检测的检测装置。 以每个目标位置设定的调制图案调制的脉冲激光在激光照射部分的目标位置被照射。 只有当从激光发射部分发射的脉冲激光的调制图案与由激光接收部分接收的脉冲激光的调制图案匹配时，DSP（数字信号处理器）才确定目标位置处存在障碍物。 抑制了当从迎面而来的轿厢等接收激光时检测装置误检目标位置的状况，因为来自其的激光的调制图案与迎面而来的轿厢等的激光的调制图案不匹配。

公开(公告)号：US20060113462A1

公开(公告)日：2006-06-01

申请号：US11283999

申请日：2005-11-22

申请人： Masato Yamada ,  Hitoshi Terasaki ,  Yoichi Tsuchiya ,  Shuichi Ichiura ,  Masahiro Higuchi ,  Mikio Ichihashi ,  Youichiro Goto ,  Yoshiaki Maeno

发明人： Masato Yamada ,  Hitoshi Terasaki ,  Yoichi Tsuchiya ,  Shuichi Ichiura ,  Masahiro Higuchi ,  Mikio Ichihashi ,  Youichiro Goto ,  Yoshiaki Maeno

IPC分类号： H01J40/14

CPC分类号： G01S17/42 ,  G01S7/4811 ,  G01S7/4817 ,  G01S7/491 ,  G01S17/48

摘要： In a beam irradiation device of the present invention, laser beams emitted from a semiconductor laser impinge on an irradiation lens supported by a lens actuator. The laser beams that have passed through the irradiation lens change in outgoing angle in the direction of a y-z plane as the lens actuator is driven. A laser beam scan in the target region is thus performed. A part of the laser beams that have passed through the irradiation lens is reflected and separated by a beam splitter. The separated beams are converged on a PSD through a converging lens. A DSP control circuit monitors a scan position of the laser beams that have passed through the irradiation lens based on a signal from the PSD. When an irradiation position has deviated from a scan trajectory, the DSP control circuit controls an actuator driving circuit to draw the irradiation position back onto the scan trajectory. This beam irradiation device can realize a smooth and stable beam scan operation with a simple construction.

摘要翻译： 在本发明的光束照射装置中，从半导体激光器发射的激光束照射在由透镜致动器支撑的照射透镜上。 当透镜致动器被驱动时，穿过照射透镜的激光束在y-z平面的方向上以出射角度改变。 因此执行目标区域中的激光束扫描。 已经通过照射透镜的激光束的一部分被分束器反射和分离。 分离的光束通过会聚透镜会聚在PSD上。 DSP控制电路基于来自PSD的信号监视已经通过照射透镜的激光束的扫描位置。 当照射位置偏离扫描轨迹时，DSP控制电路控制致动器驱动电路将照射位置反射回扫描轨迹。 该光束照射装置能够以简单的结构实现平稳稳定的束扫描操作。

公开(公告)号：US06459662B1

公开(公告)日：2002-10-01

申请号：US10076228

申请日：2002-02-19

申请人： Koichi Tada ,  Shinichi Ohe ,  Naoyuki Takagi ,  Ken Hirose ,  Shuichi Ichiura ,  Hiroshi Watanabe

发明人： Koichi Tada ,  Shinichi Ohe ,  Naoyuki Takagi ,  Ken Hirose ,  Shuichi Ichiura ,  Hiroshi Watanabe

IPC分类号： G11B700

CPC分类号： G11B7/1372 ,  G11B7/085 ,  G11B7/08511 ,  G11B7/08529 ,  G11B7/0901 ,  G11B7/1376 ,  G11B2007/0013

摘要： In order to reproduce signals from a double-layer optical disc having two signal recording surfaces, a focus jump that the focusing of an objective lens from the one signal recording surface to the other signal recording surface is quickly achieved, is necessary. When a focus error signal (FE) from a pickup (60, 70) reaches a predetermined threshold value (Vcomp), a deceleration signal for decelerating the objective lens (42) is supplied to an actuator (47). Preferably, a deceleration pulse voltage is lowered step by step. The deceleration pulse voltage is determined in accordance with the maximum value (DFEmax) of a differential focus error signal (DFE) generated by differentiating the focus error signal (FE). Preferably, the address seeking is done simultaneously with the focus jump. The focus jump is performed in accordance with the layer-to-layer distance which is measured beforehand. The focus jump is performed by using a lens (143) having a controllable focal distance. Preferably, whether the layer is the first layer or the second layer is judged based on the reflected luminous power. If the focus error signal (FE) from the other layer is not obtained even when a certain time passages after the focus jump is started, the objective lens (42) is moved in the reverse direction.

公开(公告)号：US06370093B1

公开(公告)日：2002-04-09

申请号：US09230540

申请日：1999-01-28

申请人： Koichi Tada ,  Shinichi Ohe ,  Naoyuki Takagi ,  Ken Hirose ,  Shuichi Ichiura ,  Hiroshi Watanabe

发明人： Koichi Tada ,  Shinichi Ohe ,  Naoyuki Takagi ,  Ken Hirose ,  Shuichi Ichiura ,  Hiroshi Watanabe

IPC分类号： G11B700

CPC分类号： G11B7/1372 ,  G11B7/085 ,  G11B7/08511 ,  G11B7/08529 ,  G11B7/0901 ,  G11B7/1376 ,  G11B2007/0013

摘要： In order to reproduce signals from a double-layer optical disc having two signal recording surfaces, a focus jump that the focusing of an objective lens from the one signal recording surface to the other signal recording surface is quickly achieved, is necessary. When a focus error signal (FE) from a pickup (60, 70) reaches a predetermined threshold value (Vcomp), a deceleration signal for decelerating the objective lens (42) is supplied to an actuator (47). Preferably, a deceleration pulse voltage is lowered step by step. The deceleration pulse voltage is determined in accordance with the maximum value (DFEmax) of a differential focus error signal (DFE) generated by differentiating the focus error signal (FE). Preferably, the address seeking is done simultaneously with the focus jump. The focus jump is performed in accordance with the layer-to-layer distance which is measured beforehand. The focus jump is performed by using a lens (143) having a controllable focal distance. Preferably, whether the layer is the first layer or the second layer is judged based on the reflected luminous power. If the focus error signal (FE) from the other layer is not obtained even when a certain time passages after the focus jump is started, the objective lens (42) is moved in the reverse direction.

摘要翻译： 为了从具有两个信号记录表面的双层光盘再现信号，需要快速实现从一个信号记录表面到另一个信号记录表面的物镜的聚焦的聚焦跳跃。 当来自拾取器（60,70）的聚焦误差信号（FE）达到预定阈值（Vcomp）时，用于减速物镜（42）的减速信号被提供给致动器（47）。 优选地，减速脉冲电压逐步降低。 根据通过微分聚焦误差信号（FE）产生的差分聚焦误差信号（DFE）的最大值（DFEmax）来确定减速脉冲电压。 优选地，寻址与焦点跳跃同时完成。 按照预先测量的层间距离执行聚焦跳转。 通过使用具有可控焦距的透镜（143）来进行聚焦跳跃。 优选地，基于反射的光功率来判断层是第一层还是第二层。 如果即使在聚焦跳跃开始之后经过一定时间，也不能获得来自另一层的聚焦误差信号（FE），则物镜42沿相反方向移动。

公开(公告)号：US6122242A

公开(公告)日：2000-09-19

申请号：US474907

申请日：1999-12-29

申请人： Yoichi Tsuchiya ,  Seiji Kajiyama ,  Yasuyuki Kanou ,  Shuichi Ichiura

发明人： Yoichi Tsuchiya ,  Seiji Kajiyama ,  Yasuyuki Kanou ,  Shuichi Ichiura

IPC分类号： G11B7/00 ,  G11B7/013 ,  G11B7/135 ,  G11B19/12

CPC分类号： G11B7/24085 ,  G11B19/12 ,  G11B7/1369 ,  G11B7/139 ,  G11B2007/0006

摘要： An optical disc reproducing apparatus includes a semiconductor laser, an objective lens converging a laser beam from the semiconductor laser on a recording surface of an optical disc, a polarization plane rotating unit selectively rotating the plane of polarization of the laser beam according to the thickness of a substrate of the optical disc, and a polarizing filter selectively shading a peripheral portion of the laser beam having the rotated plane of polarization. In one embodiment, a numerical aperture changing unit includes a non-patterned twisted nematic liquid crystal, and the polarizing filter includes a polarizing film having a polarization characteristics at its peripheral portion.

摘要翻译： 一种光盘再现装置，包括：半导体激光器，将来自半导体激光器的激光束会聚在光盘的记录面上的物镜;偏振面旋转单元，根据激光束的厚度选择性地旋转激光束的偏振面 光盘的基板和选择性地遮蔽具有旋转偏振平面的激光束的周边部分的偏振滤光器。 在一个实施例中，数值孔径改变单元包括非图案扭转向列型液晶，并且偏振滤光器包括在其周边部分具有偏振特性的偏振膜。

公开(公告)号：US5838657A

公开(公告)日：1998-11-17

申请号：US598383

申请日：1996-02-08

申请人： Yoichi Tsuchiya ,  Hitoshi Terasaki ,  Shuichi Ichiura ,  Toshio Ito ,  Yasuyuki Kano ,  Yoshimoto Yamaguchi ,  Seizo Kato ,  Osamu Ota

发明人： Yoichi Tsuchiya ,  Hitoshi Terasaki ,  Shuichi Ichiura ,  Toshio Ito ,  Yasuyuki Kano ,  Yoshimoto Yamaguchi ,  Seizo Kato ,  Osamu Ota

IPC分类号： G11B7/0037 ,  G11B7/005 ,  G11B7/007 ,  G11B7/013 ,  G11B7/125 ,  G11B7/135 ,  G11B19/26 ,  G11B3/70

CPC分类号： G11B7/24085 ,  G11B19/26 ,  G11B7/005 ,  G11B7/127 ,  G11B7/1374 ,  G11B7/24079 ,  G11B2007/13727 ,  G11B7/0037

摘要： An optical disc having a track pitch of 0.85 .mu.m, a shortest pit length of 0.49 .mu.m, a pit depth of 100 nm, and a pit width of 0.35 .mu.m is rotate at a linear velocity of 2.4-2.8 m/s such that the same is optically reproduced by a laser beam having a wavelength of 635 nm which is converged to a spot size of 0.9 .mu.m by an objective lens having a numerical aperture of 0.6. Accordingly, data is read from the optical disc at a transfer rate of 5.6 Mbps.

摘要翻译： 轨道间距为0.85μm，最短凹坑长度为0.49μm，凹坑深度为100nm，凹坑宽度为0.35μm的光盘以2.4-2.8m / s的线速度旋转，例如 通过具有数值孔径为0.6的物镜，其波长为635nm的激光束被光学再现，该激光束会聚到0.9μm的光斑尺寸。 因此，以5.6Mbps的传输速率从光盘读取数据。

公开(公告)号：US5586095A

公开(公告)日：1996-12-17

申请号：US251579

申请日：1994-05-31

申请人： Shuichi Ichiura ,  Osamu Ota

发明人： Shuichi Ichiura ,  Osamu Ota

IPC分类号： G02B27/58 ,  G11B7/09 ,  G11B7/135 ,  G11B7/095

CPC分类号： G11B7/1381 ,  G11B7/0903 ,  G11B7/131 ,  G11B7/1356 ,  G11B7/1359 ,  G11B7/1398 ,  G11B7/0909

摘要： An optical pickup device provides an ultraresolving prism between a semiconductor laser and an objective lens so as to reduce light intensity at around a cross sectional center of a laser beam, thereby generating ultraresolution thereon. An optical detector is disposed at a signal detecting position where the laser beam reflected by an optical disk is converged. The optical detector has a detecting element for receiving a main lobe and a pair of detecting elements for receiving a pair of side lobes. A peak of a shielding portion of the prism is inclined to a track center of the optical disk so that the side lobes are oppositely shifted from the track center. Thus, tracking error signals are obtained on the basis of detected signals in the side lobes.

摘要翻译： 光拾取装置在半导体激光器和物镜之间提供超分辨棱镜，以减少激光束的横截面中心处的光强度，从而在其上产生超分辨率。 光检测器设置在由光盘反射的激光束会聚的信号检测位置处。 光检测器具有用于接收主瓣的检测元件和用于接收一对旁瓣的一对检测元件。 棱镜的屏蔽部分的峰值倾斜于光盘的轨道中心，使得旁瓣从轨道中心相对移位。 因此，基于旁瓣中的检测信号获得跟踪误差信号。

公开(公告)号：US07570346B2

公开(公告)日：2009-08-04

申请号：US11377449

申请日：2006-03-17

申请人： Atsushi Yamaguchi ,  Shinji Kobayashi ,  Masato Yamada ,  Shuichi Ichiura

发明人： Atsushi Yamaguchi ,  Shinji Kobayashi ,  Masato Yamada ,  Shuichi Ichiura

IPC分类号： G01C3/08

CPC分类号： G01S17/936 ,  G01C3/08 ,  G01S17/46

摘要： A scan trajectory of a laser beam is controlled based on external signals each related to a driving direction and a driving speed, a result obtained by detection of an obstacle, and signals related to distances to the obstacle. For example, at the time of a right turn, a scan trajectory for increasing scan frequency on a portion shifted in a right-turn direction from a center axis in a driving direction is set. At the time of high-speed driving, a scan trajectory for increasing scan frequency on a center portion in the driving direction is set. When the obstacle is detected at a position corresponding to a distance shorter than a threshold distance, a scan trajectory for increasing scan frequency in the vicinity of the obstacle is set. Detection and monitoring are performed at the time of: changing of the driving direction, the high-speed driving, and the detection of the obstacle.

摘要翻译： 基于与驱动方向和驱动速度相关的外部信号，通过检测障碍物获得的结果以及与障碍物的距离相关的信号来控制激光束的扫描轨迹。 例如，在右转时，设定用于增加扫描频率的扫描轨迹，该扫描轨迹用于沿着驱动方向从中心轴沿右转方向移动的部分增加扫描频率。 在高速驱动时，设定用于增加驱动方向上的中心部分的扫描频率的扫描轨迹。 当在对应于比阈值距离短的距离的位置处检测到障碍物时，设置用于增加障碍物附近的扫描频率的扫描轨迹。 在改变驾驶方向，高速驾驶和障碍物的检测时进行检测和监视。

公开(公告)号：US07351944B2

公开(公告)日：2008-04-01

申请号：US11283999

申请日：2005-11-22

申请人： Masato Yamada ,  Hitoshi Terasaki ,  Yoichi Tsuchiya ,  Shuichi Ichiura ,  Masahiro Higuchi ,  Mikio Ichihashi ,  Youichiro Goto ,  Yoshiaki Maeno

发明人： Masato Yamada ,  Hitoshi Terasaki ,  Yoichi Tsuchiya ,  Shuichi Ichiura ,  Masahiro Higuchi ,  Mikio Ichihashi ,  Youichiro Goto ,  Yoshiaki Maeno

IPC分类号： G01J1/32 ,  G02B27/40 ,  G02B26/08 ,  H01J3/14 ,  B41J2/47

CPC分类号： G01S17/42 ,  G01S7/4811 ,  G01S7/4817 ,  G01S7/491 ,  G01S17/48

摘要： In a beam irradiation device of the present invention, laser beams emitted from a semiconductor laser impinge on an irradiation lens supported by a lens actuator. The laser beams that have passed through the irradiation lens change in outgoing angle in the direction of a y-z plane as the lens actuator is driven. A laser beam scan in the target region is thus performed. A part of the laser beams that have passed through the irradiation lens is reflected and separated by a beam splitter. The separated beams are converged on a PSD through a converging lens. A DSP control circuit monitors a scan position of the laser beams that have passed through the irradiation lens based on a signal from the PSD. When an irradiation position has deviated from a scan trajectory, the DSP control circuit controls an actuator driving circuit to draw the irradiation position back onto the scan trajectory. This beam irradiation device can realize a smooth and stable beam scan operation with a simple construction.

摘要翻译： 在本发明的光束照射装置中，从半导体激光器发射的激光束照射在由透镜致动器支撑的照射透镜上。 当透镜致动器被驱动时，穿过照射透镜的激光束在y-z平面的方向上以出射角度改变。 因此执行目标区域中的激光束扫描。 已经通过照射透镜的激光束的一部分被分束器反射和分离。 分离的光束通过会聚透镜会聚在PSD上。 DSP控制电路基于来自PSD的信号监视已经通过照射透镜的激光束的扫描位置。 当照射位置偏离扫描轨迹时，DSP控制电路控制致动器驱动电路将照射位置反射回扫描轨迹。 该光束照射装置能够以简单的结构实现平稳稳定的束扫描操作。

公开(公告)号：US20060244978A1

公开(公告)日：2006-11-02

申请号：US11410049

申请日：2006-04-25

申请人： Masato Yamada ,  Shuichi Ichiura

发明人： Masato Yamada ,  Shuichi Ichiura

IPC分类号： G01B11/14

CPC分类号： G01S17/936 ,  G01S7/481 ,  G01S7/4972

摘要： An irradiation pattern of a laser beam within a target region is controlled based on external signals each related to a driving direction and a driving speed, a result obtained by detection of an obstacle, and signals related to distances to the obstacle. For example, at the time of a right turn, an irradiation pattern for increasing irradiation frequency on a portion shifted in a right-turn direction from a center axis in a driving direction is set. At the time of high-speed driving, an irradiation pattern for increasing irradiation frequency on a center portion of a forward region in the driving direction is set. When the obstacle is detected and a distance to the obstacle is shorter than a threshold distance, an irradiation pattern for increasing irradiation frequency in the vicinity of the obstacle is set. Detection of the obstacle and monitoring of a state thereof are adequately and smoothly performed at the time of changing of the driving direction, the time of high-speed driving, and the time of detection of the obstacle.

摘要翻译： 基于与驱动方向和驱动速度相关的外部信号，通过检测障碍物获得的结果以及与障碍物的距离有关的信号来控制目标区域内的激光束的照射图案。 例如，在右转时，设定用于增加沿着驱动方向的中心轴在右转方向上偏移的部分上的照射频率的照射图案。 在高速驱动时，设定用于在驱动方向的前方区域的中心部分增加照射频率的照射图案。 当检测到障碍物并且与障碍物的距离小于阈值距离时，设置用于增加障碍物附近的照射频率的照射模式。 在改变行驶方向，高速行驶时间和障碍物的检测时间时，对障碍物的检测和状态的监视能够充分而平稳地进行。