公开(公告)号：US06366543B2

公开(公告)日：2002-04-02

申请号：US09819794

申请日：2001-03-29

申请人： Kamon Uemura ,  Kiyoshi Ohsato ,  Akio Yamakawa ,  Masamichi Utsumi

发明人： Kamon Uemura ,  Kiyoshi Ohsato ,  Akio Yamakawa ,  Masamichi Utsumi

IPC分类号： G11B7095

CPC分类号： G11B19/128 ,  G11B7/0901 ,  G11B7/1372 ,  G11B7/1381 ,  G11B7/139 ,  G11B19/12 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An optical pickup including a light source for radiating a light beam, a diffraction element for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens for converging the light beams separated by the diffraction element on a signal recording surface of the optical recording medium, a light receiving unit having a four-segment first light receiving portion for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions arranged on both sides of the first light receiving portion for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit for generating a first tracking signal based on respective outputs of the first light receiving portion and for generating a second tracking signal based on outputs of the second and third light receiving portions.

摘要翻译： 一种包括用于照射光束的光源的光学拾取器，用于将从光源辐射的光束分成至少三个光束，即主光束和两个侧光束的衍射元件，用于会聚分离的光束的物镜 通过光记录介质的信号记录表面上的衍射元件，具有用于接收由光记录介质的记录表面反射的主光束的四段第一光接收部分和第二和第三光接收部分的光接收单元 布置在第一光接收部分的两侧，用于接收由光记录介质的记录表面反射的侧光束;以及计算单元，用于基于第一光接收部分的各个输出产生第一跟踪信号， 基于第二和第三光接收部分的输出的第二跟踪信号。

公开(公告)号：US06222803B1

公开(公告)日：2001-04-24

申请号：US08661459

申请日：1996-06-11

申请人： Kamon Uemura ,  Kiyoshi Ohsato ,  Akio Yamakawa ,  Masamichi Utsumi

发明人： Kamon Uemura ,  Kiyoshi Ohsato ,  Akio Yamakawa ,  Masamichi Utsumi

IPC分类号： G11B7095

CPC分类号： G11B19/128 ,  G11B7/0901 ,  G11B7/1372 ,  G11B7/1381 ,  G11B7/139 ,  G11B19/12 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An optical pickup including a light source for radiating a light beam, a diffraction element for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens for converging the light beams separated by the diffraction element on a signal recording surface of the optical recording medium, a light receiving unit having a four-segment first light receiving portion for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions arranged on both sides of the first light receiving portion for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit for generating a first tracking signal based on respective outputs of the first light receiving portion and for generating a second tracking signal based on outputs of the second and third light receiving portions.

摘要翻译： 一种包括用于照射光束的光源的光学拾取器，用于将从光源辐射的光束分成至少三个光束，即主光束和两个侧光束的衍射元件，用于会聚分离的光束的物镜 通过光记录介质的信号记录表面上的衍射元件，具有用于接收由光记录介质的记录表面反射的主光束的四段第一光接收部分和第二和第三光接收部分的光接收单元 布置在第一光接收部分的两侧，用于接收由光记录介质的记录表面反射的侧光束;以及计算单元，用于基于第一光接收部分的各个输出产生第一跟踪信号， 基于第二和第三光接收部分的输出的第二跟踪信号。

公开(公告)号：US5737294A

公开(公告)日：1998-04-07

申请号：US607449

申请日：1996-02-27

申请人： Akio Yamakawa ,  Kamon Uemura

发明人： Akio Yamakawa ,  Kamon Uemura

IPC分类号： G02B13/00 ,  G02B3/04 ,  G11B7/00 ,  G11B7/005 ,  G11B7/135 ,  G02B3/00

CPC分类号： G02B3/04 ,  G11B7/1374 ,  G11B2007/0006

摘要： An objective lens having at least two regions of different numerical apertures is configured for focusing a light beam through the regions of the different numerical apertures on two different signal recording surfaces of at least two optical discs having light transmitting layers of different thicknesses. Since the objective lens is integrally formed by at least two lens portions, a light beam outgoing from a common light source is focused on signal recording surfaces of at least two optical discs having the light transmitting layers of different thicknesses.

摘要翻译： 具有不同数值孔径的至少两个区域的物镜被配置用于将光束聚焦在具有不同厚度的透光层的至少两个光盘的两个不同信号记录表面上的不同数值孔径的区域。 由于物镜由至少两个透镜部分整体形成，所以从公共光源出射的光束聚焦在具有不同厚度的透光层的至少两个光盘的信号记录表面上。

公开(公告)号：US5875164A

公开(公告)日：1999-02-23

申请号：US743826

申请日：1996-11-05

申请人： Akio Yamakawa ,  Kamon Uemura

发明人： Akio Yamakawa ,  Kamon Uemura

IPC分类号： G11B7/09 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/013 ,  G11B7/13 ,  G11B7/135 ,  G11B27/36

CPC分类号： G11B7/133 ,  G11B7/131 ,  G11B7/1381 ,  G11B2007/0006 ,  G11B7/0037 ,  G11B7/0909

摘要： A laser diode applies a laser beam through a grating, a beam splitter, and an objective to a compact disc. A laser beam reflected by the compact disc is applied through the objective and the beam splitter to a photodiode. The objective has a large numerical aperture of 0.6 in order to be able of play back a digital video disc that has a thin substrate and contains information recorded at a high density. To prevent the photodiode from suffering aberrations caused due to the large numerical aperture of the objective, the photodiode has a relatively small photodetector unit having a normalized detector size ranging from 3 .mu.m to 16 .mu.m, for detecting only returning light up to a numerical aperture of 0.3 and not detecting light of greater numerical aperture values.

摘要翻译： 激光二极管将激光束通过光栅，分束器和物镜施加到光盘。 由光盘反射的激光束通过物镜和分束器施加到光电二极管。 该目的具有0.6的大数值孔径，以便能够播放具有薄衬底并且包含以高密度记录的信息的数字视频盘。 为了防止光电二极管遭受由于物镜的大数值孔径引起的像差，光电二极管具有相对较小的光电检测器单元，其具有范围从3μm至16μm的归一化检测器尺寸，用于仅检测返回光直到数值 孔径为0.3，不检测更大数值孔径值的光。

公开(公告)号：USRE38538E1

公开(公告)日：2004-06-22

申请号：US10202648

申请日：2002-07-25

申请人： Akio Yamakawa ,  Kamon Uemura

发明人： Akio Yamakawa ,  Kamon Uemura

IPC分类号： G11B700

CPC分类号： G11B7/133 ,  G11B7/0037 ,  G11B7/0909 ,  G11B7/131 ,  G11B7/1381 ,  G11B2007/0006

摘要： A laser diode applies a laser beam through a grating, a beam splitter, and an objective to a compact disc. A laser beam reflected by the compact disc is applied through the objective and the beam splitter to a photodiode. The objective has a large numerical aperture of 0.6 in order to be able of play back a digital video disc that has a thin substrate and contains information recorded at a high density. To prevent the photodiode from suffering aberrations caused due to the large numerical aperture of the objective, the photodiode has a relatively small photodetector unit having a normalized detector size ranging from 3 &mgr;m to 16 &mgr;m, for detecting only returning light up to a numerical aperture of 0.3 and not detecting light of greater numerical aperture values.

公开(公告)号：US5742575A

公开(公告)日：1998-04-21

申请号：US694544

申请日：1996-08-09

申请人： Akio Yamakawa ,  Masamichi Utsumi

发明人： Akio Yamakawa ,  Masamichi Utsumi

IPC分类号： G11B7/00 ,  G11B7/0037 ,  G11B7/095 ,  G11B7/13 ,  G11B19/12

CPC分类号： G11B7/131 ,  G11B19/12 ,  G11B7/0037 ,  G11B2007/0006 ,  G11B7/0956

摘要： The type of optical disc having different track pitch is identified simply. A light emitted from the LED 21 is irradiated through a condenser lens 22 onto an optical disc 1. The incident light is diffracted and reflected by the pit 3. When, if the optical disc 1 is a CD, the first order diffracted light is received by the first light receiver 10, on the other hand, if the optical disc 1 is a DVD having a smaller track pitch Pt, the first order diffracted light is received by the second light receiver 11. Therefore, the type of the optical disc 1 is identified based on a light receiving signal of the first light receiver 10 and the second light receiver 11.

摘要翻译： 简单地标识具有不同轨道间距的光盘类型。 从LED21发射的光通过聚光透镜22照射到光盘1上。入射光被凹坑3衍射并反射。当光盘1是CD时，接收一级衍射光 另一方面，通过第一光接收器10，如果光盘1是具有较小轨道间距Pt的DVD，则第一光接收器11接收一级衍射光。因此，光盘1的类型 基于第一光接收器10和第二光接收器11的光接收信号来识别。

公开(公告)号：US5751679A

公开(公告)日：1998-05-12

申请号：US694262

申请日：1996-08-08

申请人： Akio Yamakawa ,  Masamichi Utsumi

发明人： Akio Yamakawa ,  Masamichi Utsumi

IPC分类号： G11B7/135 ,  G11B7/12

CPC分类号： G11B7/1374 ,  G11B7/1353

摘要： An optical pickup and a reproducing apparatus includes an objective lens having a hologram lens formed over the entire area of one surface thereof. A central portion of the hologram lens and peripheral portions of the hologram lens are formed differently, so that a laser beam diffracted by the central portion of the hologram lens is focused at plane A, and a laser beam diffracted by the peripheral portion is directed outward. As a result of this, the light intensity distribution after light has passed through the objective lens becomes substantially uniform, so that almost no primary ring is produced, thus preventing cross talk caused by reflected light from an adjacent track.

摘要翻译： 光学拾取器和重放装置包括在其一个表面的整个区域上形成有全息透镜的物镜。 全息透​​镜的中心部分和全息透镜的外围部分的形状不同，使得由全息透镜的中心部分衍射的激光束聚焦在平面A处，并且由周边部分衍射的激光束向外指向 。 结果，光通过物镜之后的光强分布变得基本均匀，使得几乎不产生主环，从而防止由相邻轨道的反射光引起的串扰。

公开(公告)号：US5682372A

公开(公告)日：1997-10-28

申请号：US698309

申请日：1996-08-15

申请人： Akio Yamakawa ,  Tetsuo Usui ,  Masamichi Utsumi

发明人： Akio Yamakawa ,  Tetsuo Usui ,  Masamichi Utsumi

IPC分类号： G11B7/00 ,  G11B7/085 ,  G11B7/09

CPC分类号： G11B7/08511 ,  G11B7/0945 ,  G11B2007/0013 ,  G11B7/0908

摘要： There is disclosed a method of playing back information from an optical multilayer disk having a plurality of recording disks stacked on top of each other, by the use of an optical pickup device. In order to switch the focused recording layer from a first one to a second one so that data is read from the second recording layer, the focus balanced condition of the pickup device is switched from a setting providing a focus error characteristic adapted for the first recording layer to a reference setting providing a neutral focus error characteristic. Then, the focal point of the pickup device is moved from the first recording layer. Subsequently, the pickup device is focused onto the second recording layer, and data is read from the second recording layer. Thereafter, the focus balanced condition of the pickup device is switched to a setting adapted to the second recording layer.

摘要翻译： 公开了一种通过使用光学拾取装置从具有堆叠在彼此顶部的多个记录盘的光学多层盘回放信息的方法。 为了将聚焦记录层从第一记录层切换到第二记录层，从而从第二记录层读取数据，从提供适合于第一记录的聚焦误差特征的设置切换拾取装置的聚焦平衡状态 层到提供中立聚焦误差特性的参考设置。 然后，拾取装置的焦点从第一记录层移动。 随后，拾取装置被聚焦到第二记录层上，并从第二记录层读取数据。 此后，拾取装置的聚焦平衡状态切换到适合于第二记录层的设置。

公开(公告)号：US5506830A

公开(公告)日：1996-04-09

申请号：US106129

申请日：1993-08-12

申请人： Seiichiroh Ohishi ,  Akio Yamakawa ,  Takashi Seki ,  Tetsuhiro Shiomi

发明人： Seiichiroh Ohishi ,  Akio Yamakawa ,  Takashi Seki ,  Tetsuhiro Shiomi

IPC分类号： G11B7/085 ,  G11B17/04 ,  G11B21/02 ,  G11B17/30

CPC分类号： G11B17/056 ,  G11B7/08594

摘要： A disk player has a guide member for guiding an optical pickup carrier along both sides of a double-sided disk. In order to prevent interference between the pickup carrier and the periphery of the disk during turning movement of the pickup carrier around the periphery of the disk from one of the upper and lower sides of the disk to the other side, the guide member is shaped like a horseshoe. The guide member includes upper and lower straight sections for guiding the pickup carrier, respectively, along the upper and lower sides of the disc, and an arched section extending vertically around the periphery of the disk and connecting the outer ends of the upper and lower straight sections. The upper and lower straight sections are not parallel to each other, but rather they are inclined in such a fanlike manner that the outer ends are wider apart.

摘要翻译： 磁盘播放器具有用于沿着双面盘的两侧引导光学拾取器载体的引导构件。 为了防止在将拾取器载体围绕盘的周边从盘的上侧和下侧之一转移到另一侧的转动载体周围移动期间的拾取器载体和盘周边之间的干扰，引导构件形状如 马蹄铁 引导构件包括用于分别沿着盘的上侧和下侧引导拾取器载体的上部和下部直段，以及围绕盘的周边垂直延伸并且连接上部和下部直线的外端的弓形部分 部分。 上部和下部直线段彼此不平行，而是以这样一种扇形的方式倾斜，使得外端分开较宽。

公开(公告)号：US06570828B2

公开(公告)日：2003-05-27

申请号：US09842868

申请日：2001-04-27

申请人： Nobuyasu Kikuchi ,  Akio Yamakawa ,  Yusaku Seki ,  Tetsuo Maeda ,  Yutaka Sugawara

发明人： Nobuyasu Kikuchi ,  Akio Yamakawa ,  Yusaku Seki ,  Tetsuo Maeda ,  Yutaka Sugawara

IPC分类号： G11B700

CPC分类号： G11B7/0932 ,  G11B7/0933 ,  G11B7/0935 ,  G11B7/0956 ,  G11B11/10576

摘要： A skew of an optical pickup device can be adjusted by a movable-side member itself which holds thereon an objective lens. A holder which holds an objective lens is supported by four spring wires such that it can be moved in the focusing direction and the tracking direction of an optical disk. A center of a magnetic circuit which drives the holder is shifted in the outer peripheral side relative to the optical disk. Elastic force of the spring wires of the inner peripheral side is suppressed by increasing the amount of a gel material bonded to the spring wires located on the inner peripheral side of the optical disk as a damping material as compared with the amount of the gel material bonded to the spring wires located on the outer peripheral side. Thus, the holder can be driven by a predetermined inclination in the focusing direction such that the optical axis of the objective lens becomes substantially perpendicular to the signal recording surface of the optical disk in response to the focus height changed due to the skew of the optical disk.

摘要翻译： 光拾取装置的偏斜可以通过保持物镜的可动侧部件本身进行调节。 保持物镜的保持器由四个弹簧线支撑，使得其可以在光盘的聚焦方向和跟踪方向上移动。 驱动保持器的磁路的中心相对于光盘在外周侧移位。 与凝胶材料的粘合量相比，通过增加作为阻尼材料的位于作为阻尼材料的位于作为阻尼材料的光盘的内周侧的弹簧丝的凝胶材料的量来抑制内周侧的弹簧丝的弹力 到位于外周侧的弹簧线。 因此，可以在聚焦方向上以预定的倾斜度驱动保持器，使得物镜的光轴响应于由于光学偏斜而偏移的聚焦高度而变得基本上垂直于光盘的信号记录表面 磁盘。