公开(公告)号：US07020051B2

公开(公告)日：2006-03-28

申请号：US09984886

申请日：2001-10-31

申请人： Tae-kyung Kim ,  Young-man Ahn ,  Hae-jung Suh ,  Chong-sam Chung

发明人： Tae-kyung Kim ,  Young-man Ahn ,  Hae-jung Suh ,  Chong-sam Chung

IPC分类号： G11B7/095 ,  G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/007 ,  G11B7/00718 ,  G11B7/131 ,  G11B7/1369 ,  G11B7/1381 ,  G11B7/13927

摘要： An optical pickup is provided for a recording medium, including: a light source generating and emitting a light beam; a light beam division and detection unit dividing a particular light beam portion of the light beam after being reflected/diffracted from the recording medium into sub-divided light beams portions, and detecting the sub-divided light beam portions; and a spherical aberration detection circuit processing the sub-divided light beam portions to detect spherical aberration caused by thickness variation of the recording medium.

公开(公告)号：US06961292B2

公开(公告)日：2005-11-01

申请号：US09817754

申请日：2001-03-27

申请人： Byung-in Ma ,  Chong-sam Chung ,  In-sik Park ,  Byoung-ho Choi ,  Tae-yong Doh

发明人： Byung-in Ma ,  Chong-sam Chung ,  In-sik Park ,  Byoung-ho Choi ,  Tae-yong Doh

IPC分类号： G11B7/135 ,  G11B7/085 ,  G11B7/09 ,  G11B7/13

CPC分类号： G11B7/131 ,  G11B7/08505 ,  G11B7/0943 ,  G11B7/133 ,  G11B7/1353

摘要： An apparatus generating a seek direction detecting signal includes a light dividing unit dividing an incident light beam into at least two beams having a main beam and a sub-beam so that at least two beam spots including a main beam spot and at least one sub-beam spot having an optical aberration, can be focused in the track direction of an optical disk, the light dividing unit providing that the direction of the optical aberration of the sub-beam spot can be the tangential direction of the optical disk, an optical detector unit, a first signal processing portion processing a track error signal from signals output from the optical detector, a second signal processing portion processing a track cross signal from the signals output from the optical detector, and a generator generating the seek direction detecting signal from the phase difference between the track cross signal and the track error signal.

摘要翻译： 产生搜索方向检测信号的装置包括：光分离单元，将入射光束分成至少两束具有主光束和子光束的光束，使得至少两个光束点包括主光束斑点和至少一个子光束点， 具有光学像差的光束点可以在光盘的轨道方向上聚焦，所述光分割单元使得子光束点的光学像差的方向可以是光盘的切线方向，光学检测器 单元，第一信号处理部分，从光检测器输出的信号处理轨道误差信号;第二信号处理部分，处理来自光检测器输出的信号的轨道交叉信号;以及发生器，其生成来自所述光检测器的寻道方向检测信号 轨道交叉信号和轨道误差信号之间的相位差。

公开(公告)号：US20050152240A1

公开(公告)日：2005-07-14

申请号：US11079109

申请日：2005-03-15

申请人： Byung-in Ma ,  Byoung-ho Choi ,  Chong-sam Chung ,  In-sik Park ,  Tae-yong Doh

发明人： Byung-in Ma ,  Byoung-ho Choi ,  Chong-sam Chung ,  In-sik Park ,  Tae-yong Doh

IPC分类号： G11B7/095 ,  G11B7/13 ,  G11B7/00

CPC分类号： G11B7/131 ,  G11B7/0956

摘要： An error signal detection method includes detecting light incident through an objective lens after having been reflected and diffracted from a recording medium, as eight light portions in a matrix including four inner light portions and four outer light portions, wherein the rows and columns of the matrix are parallel to the tangential and radial direction of the recording medium, respectively; calculating a first sum signal by summing a detection signal from at least one outer light portion located in a first diagonal direction, and a detection signal from an inner light portion located in a second diagonal direction; calculating second sum signal by summing a detection signal from an inner light portion located in the first diagonal direction, and a detection signal from an outer light portion located in the second diagonal direction; and comparing phases of the first and second sum signals to detect a tilt error signal.

摘要翻译： 误差信号检测方法包括检测从记录介质反射和衍射之后通过物镜入射的光，作为包括四个内部光部分和四个外部光部分的矩阵中的八个光部分，其中矩阵的行和列 分别与记录介质的切向和径向方向平行; 通过对来自位于第一对角线方向的至少一个外部光部分的检测信号和来自位于第二对角线方向的内部光部分的检测信号求和来计算第一和信号; 通过对来自位于第一对角线方向的内部光部分的检测信号和来自位于第二对角线方向的外部光部分的检测信号进行求和来计算第二和信号; 以及比较第一和第二和信号的相位以检测倾斜误差信号。

公开(公告)号：US06853614B2

公开(公告)日：2005-02-08

申请号：US09822847

申请日：2001-04-02

申请人： Tae-kyung Kim ,  Young-man Ahn ,  Chong-sam Chung ,  Hea-jung Suh

发明人： Tae-kyung Kim ,  Young-man Ahn ,  Chong-sam Chung ,  Hea-jung Suh

IPC分类号： G11B7/12 ,  G02B5/30 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/1275 ,  G02B5/3083 ,  G11B7/1367 ,  G11B7/13922 ,  G11B2007/0006

摘要： An optical pickup includes an aberration correction element to correct chromatic aberration caused by variation of power from a light source when changing between operating modes in a recording medium. The aberration correction includes a first retardation member, which includes a stepped convex pattern with a plurality of steps at one side, and a second retardation member combined with the first retardation member. The second retardation member includes a stepped concave pattern with a plurality of steps at one side facing the first retardation member, the stepped concave pattern corresponding to the stepped convex pattern. The first and the second retardation members include different refractive indices for a light beam, which allows the first and the second retardation members to selectively create a phase difference of an incident light beam according to a polarization of the incident light beam.

摘要翻译： 光拾取器包括像差校正元件，用于在记录介质中在操作模式之间进行变化时，校正由光源产生的功率变化引起的色差。 像差校正包括第一延迟构件，其包括在一侧具有多个台阶的阶梯凸形图案和与第一延迟构件组合的第二延迟构件。 第二延迟构件包括在面向第一延迟构件的一侧具有多个台阶的阶梯式凹形图案，阶梯形凹形图案对应于阶梯状凸起图案。 第一和第二延迟构件包括不同于光束的折射率，这允许第一和第二延迟构件根据入射光束的偏振选择性地产生入射光束的相位差。

公开(公告)号：US06798731B1

公开(公告)日：2004-09-28

申请号：US09711949

申请日：2000-11-15

申请人： Tae-kyung Kim ,  Chong-sam Chung ,  Young-man Ahn ,  Hea-jung Suh

发明人： Tae-kyung Kim ,  Chong-sam Chung ,  Young-man Ahn ,  Hea-jung Suh

IPC分类号： G11B700

CPC分类号： G11B7/1353 ,  G11B7/005 ,  G11B7/0948 ,  G11B7/0956 ,  G11B7/13927

摘要： An optical pickup apparatus for compensating for the deviation in the thickness of the optical disk and method therefor. The optical pickup includes a light source which emits light, an optical path changer which changes a proceeding path of incident light, an objective lens which focuses incident light to form a light spot on an optical disk, a light splitter, provided on the optical path between the light source and the optical path changer, which splits incident light into at least two light beams including first and second light beams so that at least two light spots including a main light spot having no aberration and an auxiliary light spot having a predetermined spherical aberration are formed on the optical disk, a photodetector including first and second light receiving portions which respectively receive the first and second incident light beams reflected by the optical disk and passing through the optical path changer, and a signal processing portion, including a delay which delays the phase of a second signal in order to synchronize a first signal and the second signal which are detected and optoelectrically converted by the first and second light receiving portions, to compensate for the deviation in the thickness of the optical disk.

摘要翻译： 一种补偿光盘厚度偏差的光拾取装置及其方法。 光拾取器包括发光的光源，改变入射光的行进路径的光路改变器，将入射光聚焦以在光盘上形成光点的物镜，设置在光路上的光分离器 在光源和光路改变器之间，其将入射光分成包括第一和第二光束的至少两个光束，使得包括不具有像差的主光点和具有预定球面的辅助光点的至少两个光点 在光盘上形成像差，包括分别接收由光盘反射并通过光路改变器的第一和第二入射光束的第一和第二光接收部分的光电检测器，以及包括延迟的信号处理部分 延迟第二信号的相位，以便使检测到的第一信号和第二信号同步 由第一和第二光接收部分光电转换，以补偿光盘厚度的偏差。

公开(公告)号：US06687201B2

公开(公告)日：2004-02-03

申请号：US09846264

申请日：2001-05-02

申请人： Byung-in Ma ,  Chong-sam Chung ,  In-sik Park ,  Byoung-ho Choi ,  Tae-yong Doh ,  Jin-hoon Jeon

发明人： Byung-in Ma ,  Chong-sam Chung ,  In-sik Park ,  Byoung-ho Choi ,  Tae-yong Doh ,  Jin-hoon Jeon

IPC分类号： G11B700

CPC分类号： G11B7/1353 ,  G11B7/00718 ,  G11B7/08505 ,  G11B7/0903 ,  G11B7/0943 ,  G11B7/0956 ,  G11B7/131 ,  G11B7/13922 ,  G11B7/1398

摘要： An apparatus for use in an optical disc includes an optical disc and an optical branching unit irradiating a main light beam and a sub-light beam, wherein the sub-light beam includes a optical aberration in a direction on a track of the optical disc. The apparatus further includes a photodetector including a plurality of portions receiving and processing the main light beam and a plurality of portions receiving and processing the sub-light beam. A track error signal detector detects a track error signal from the portions receiving the main light beam. A track cross signal detector detects a track cross signal from the portions receiving the main light beam and from the portions receiving the sub-light beam. A signal processor further compares the track error signal with the track cross signal to detect the seek direction of a light spot formed on the optical disc.

摘要翻译： 用于光盘的装置包括光盘和照射主光束和副光束的光分支单元，其中副光束包括在光盘的轨道上的方向上的光学像差。 该装置还包括一个光电检测器，它包括接收和处理主光束的多个部分和接收和处理子光束的多个部分。 轨道误差信号检测器从接收主光束的部分检测轨道误差信号。 轨道交叉信号检测器检测来自接收主光束的部分和接收子光束的部分的轨道交叉信号。 信号处理器还将轨道误差信号与轨道交叉信号进行比较，以检测形成在光盘上的光点的寻道方向。

公开(公告)号：US06678233B2

公开(公告)日：2004-01-13

申请号：US09794079

申请日：2001-02-28

申请人： Chong-sam Chung ,  Tae-kyung Kim ,  Young-man Ahn ,  Hea-jung Suh

发明人： Chong-sam Chung ,  Tae-kyung Kim ,  Young-man Ahn ,  Hea-jung Suh

IPC分类号： G11B700

CPC分类号： G11B7/1353 ,  G11B7/127 ,  G11B7/1374 ,  G11B7/1378 ,  G11B7/13922 ,  G11B2007/0006

摘要： An objective lens includes an aspherical lens facing a disk and having a predetermined first focal distance and a predetermined numerical aperture, and a holographic lens installed adjacent to the aspherical lens and having a second focal distance longer than that of the first focal distance and having a diffraction lattice to compensate for the chromatism due to a change in wavelength of laser light having a wavelength of 670 nm or less. Thus, during the shift between recoding and reproduction of a DVD or an HD-DVD, the change in wavelength due to the change in power of the laser light and chromatism according to the change can be effectively corrected. Also, since the objective lens is formed of one aspherical lens and one holographic lens, the material for each of the lenses can be easily selected and also the structure of the optical pickup using the objective lens according to the present invention can be simplified.

摘要翻译： 物镜包括面对盘并且具有预定的第一焦距和预定数值孔径的非球面透镜，以及安装在非球面透镜附近并具有比第一焦距的第二焦距更长的第二焦点距离的全息透镜， 衍射晶格以补偿由于波长为670nm或更小的激光的波长变化引起的色差。 因此，在DVD或HD-DVD的再编码和再现之间的移动期间，可以有效地校正由于激光的功率变化引起的波长变化和根据变化的色差。 此外，由于物镜由一个非球面透镜和一个全息透镜形成，因此可以容易地选择每个透镜的材料，并且还可以简化根据本发明的使用该物镜的光学拾取器的结构。

公开(公告)号：US06580670B2

公开(公告)日：2003-06-17

申请号：US09854922

申请日：2001-05-15

申请人： Tae-Kyung Kim ,  Chong-sam Chung ,  Young-man Ahn ,  Hea-jung Suh

发明人： Tae-Kyung Kim ,  Chong-sam Chung ,  Young-man Ahn ,  Hea-jung Suh

IPC分类号： G11B700

CPC分类号： G11B7/0943 ,  G11B7/0901 ,  G11B7/0941 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1381

摘要： An optical pickup including a light detection element to divide light reflected from an optical recording medium into first through fourth light beam portions in a radial direction of the optical recording medium. From detection signals from the light detection element, a reproduction signal detection portion detects an information signal, and a tracking error signal detection portion detects a tracking error signal. The light source emits light that is focused as a single light spot on a main track of the optical recording medium. The tracking error signal detection portion gain controls and sums push-pull signals from the detection signals to detect, during a recording operation, a tracking error signal with reduced push-pull offset without erasing existing signals on adjacent tracks. The reproduction signal detection portion sums and gain controls the detection signals to detect an information signal containing reduced crosstalk from adjacent tracks.

公开(公告)号：US6081498A

公开(公告)日：2000-06-27

申请号：US14621

申请日：1998-01-28

申请人： Jang-hoon Yoo ,  Chul-woo Lee ,  Chong-sam Chung

发明人： Jang-hoon Yoo ,  Chul-woo Lee ,  Chong-sam Chung

IPC分类号： G11B7/135 ,  G11B7/00 ,  G11B7/12 ,  G11B7/125

CPC分类号： G11B7/1365 ,  G11B7/13922 ,  G11B2007/0006

摘要： An optical pickup is compatible with at least two types of optical recording media each using light beams having different wavelengths from one another and which are used for recording and reproducing information. The optical pickup includes a first laser light source for emitting a first light beam having a relatively long wavelength, and a second laser light source for emitting a second light beam having a relatively short wavelength. A beam splitting plate transmits the first light beam and reflects the second light beam toward a collimator. The collimator collimates the light beam incident from the beam splitting plate to transmit the collimated light beam into an objective lens. The objective lens is designed so that the second light beam is focused on the information recording surface of a second optical recording medium whose information recording surface is closer to the objective lens than the information recording surface of the first optical recording medium, to form an optical spot optimized to the second optical recording medium. The optical distance from the first laser light source to the information recording surface of a first optical recording medium whose information recording surface is relatively farther from the objective lens, is shorter than the optical distance from the second laser light source to the information recording surface of the second optical recording medium so that spherical aberration occurring when the first light beam is used is removed. An aberration correction plate is located on an optical path between the first laser light source and the beam splitting plate, and corrects an optical aberration occurring when the beam splitting plate is used.

摘要翻译： 光学拾取器与至少两种类型的光学记录介质兼容，每种光学记录介质使用彼此不同波长的光束并且用于记录和再现信息。 光学拾取器包括用于发射具有较长波长的第一光束的第一激光光源和用于发射具有较短波长的第二光束的第二激光光源。 分束板透射第一光束并将第二光束反射到准直仪。 准直器准直从分束板入射的光束，将准直光束传输到物镜中。 物镜被设计成使得第二光束聚焦在其信息记录表面比第一光学记录介质的信息记录表面更靠近物镜的第二光学记录介质的信息记录表面上，以形成光学 对第二光记录介质进行优化。 从第一激光光源到其信息记录表面相对远离物镜的第一光记录介质的信息记录表面的光学距离比从第二激光光源到信息记录表面的光学距离短 第二光学记录介质，使得当使用第一光束时发生的球面像差被去除。 像差校正板位于第一激光光源和分束板之间的光路上，并且校正当使用分束板时发生的光学像差。

公开(公告)号：US5991254A

公开(公告)日：1999-11-23

申请号：US903063

申请日：1997-07-30

申请人： Chul-woo Lee ,  Keon-ho Cho ,  Chong-sam Chung

发明人： Chul-woo Lee ,  Keon-ho Cho ,  Chong-sam Chung

IPC分类号： G11B7/00

CPC分类号： G11B7/1365 ,  G11B7/1353

摘要： An optical pickup adopting a multi-coated polarization holographic optical element (HOE). The optical pickup has a light source, an objective lens for converging light emitted from the light source on a recording medium, a holographic optical element (HOE) arranged along an optical path between the light source and the objective lens, for changing traveling of the incident light, a phase delay plate arranged between the HOE and the recording medium, for changing a polarization direction of the incident light, and a photodetector for receiving the light reflected by the recording medium, wherein the HOE includes a polarization beam splitter for transmitting one polarized light component of the incident light and reflecting the other polarized light component thereof; and a reflection member having a hologram pattern for diffracting the light passed through the polarization beam splitter, for reflecting the incident light, and wherein the HOE is arranged at an angle between the light source and the phase delay plate. Also, when a transmission-type HOE is adopted, the phase delay plate is arranged at an angle along the optical path between the HOE and the objective lens and includes multiple coating layers for transmitting one polarized light component of the light incident from the light source and reflecting the other polarized light component, and a reflection layer formed on one side of the multiple coating layers, for completely reflecting the incident light.

摘要翻译： 采用多层偏振全息光学元件（HOE）的光学拾取器。 光拾取器具有光源，用于将从光源发射的光会聚在记录介质上的物镜，沿着光源和物镜之间的光路布置的全息光学元件（HOE），用于改变 入射光，布置在HOE和记录介质之间的相位延迟板，用于改变入射光的偏振方向;以及光电检测器，用于接收由记录介质反射的光，其中HOE包括偏振分束器，用于传输一个 入射光的偏振光分量并反射其他偏振光分量; 以及反射构件，其具有用于衍射穿过偏振分束器的光用于反射入射光的全息图，并且其中HOE以光源和相位延迟板之间的角度布置。 此外，当采用透射型HOE时，相位延迟板沿着HOE和物镜之间的光路以一定角度布置，并且包括多个涂覆层，用于透射从光源入射的光的一个偏振光分量 并且反射另一个偏振光分量，以及形成在多个涂层的一侧上的反射层，用于完全反射入射光。