-
公开(公告)号：US20080219119A1
公开(公告)日：2008-09-11
申请号：US12074968
申请日：2008-03-07
IPC分类号： G11B5/58
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0912 , G11B7/131 , G11B7/133 , G11B2007/0013
摘要： Provided is an optical pickup which can eliminate a problem of causing a focus error signal and a tracking error signal to fluctuate due to interference of a signal light beam with a return light beam from another recording surface of a multi-layer optical disc during reproduction,comprising: a laser source for emitting an optical beam, an objective lens for focusing the light beam onto the multi-layer optical disc, a polarizing grating located at a position through which a reflected light beam from the multi-layer optical disc passes, for branching the reflected beam into at least two light beams, that is, a 0-order light beam and a +1-order light beam having a direction of polarization which is orthogonal to that of the 0-order light beam, an optical detector for receiving the two light beams, a first light receiving zone which is provided in the optical detector, and onto which the 0-order light is irradiated, and a second light receiving zone which is provided in the optical detector and onto which the +1-order light beam is irradiated, wherein the optical detector is capable of delivering a push-pull signal obtained from the first light receiving zone, and a signal obtained by a computation formula similar to the push-pull signal, from the second light receiving zone, and for delivering signals capable of creating a tracking error signal and a focus error signal from a difference signal between the two delivered signals.
摘要翻译： 提供了一种光学拾取器，其可以消除由于在再现期间由于信号光束与来自多层光盘的另一记录表面的返回光束的干涉而导致聚焦误差信号和跟踪误差信号的波动的问题， 包括：用于发射光束的激光源，用于将光束聚焦到多层光盘上的物镜，位于多层光盘反射光束经过的位置的偏振光栅，用于 将反射光束分成至少两个光束，即具有正交于0阶光束的偏振方向的0级光束和+ 1级光束，光检测器 接收两个光束，设置在光学检测器中的第一光接收区，其上照射0次光的第一光接收区和设置在光学检测器中的第二光接收区 并且其上照射了+ 1级光束，其中光学检测器能够传递从第一光接收区获得的推挽信号，以及通过类似于推挽信号的计算公式获得的信号 ，并且用于从两个传送的信号之间的差分信号传送能够产生跟踪误差信号和聚焦误差信号的信号。
-
公开(公告)号：US20080031119A1
公开(公告)日：2008-02-07
申请号：US11905509
申请日：2007-10-02
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0945 , G11B2007/0006
摘要： An optical pickup includes a diffraction grating partitioned into three areas, in which the phase of periodic grating groove structure in an area is successively shifted from that in the adjacent area by 90°. In the generation of a differential push-pull signal, an amplification factor K for sub push-pull signals is varied depending on the type of the optical disk. By such composition of the optical pickup, amplitude deterioration of the tracking error signal accompanying displacement of the object lens is reduced.
-
公开(公告)号：US20080031105A1
公开(公告)日：2008-02-07
申请号：US11905533
申请日：2007-10-02
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0945 , G11B2007/0006
摘要： An optical pickup includes a diffraction grating partitioned into three areas, in which the phase of periodic grating groove structure in an area is successively shifted from that in the adjacent area by 90°. In the generation of a differential push-pull signal, an amplification factor K for sub push-pull signals is varied depending on the type of the optical disk. By such composition of the optical pickup, amplitude deterioration of the tracking error signal accompanying displacement of the object lens is reduced.
-
公开(公告)号：US20070242575A1
公开(公告)日：2007-10-18
申请号：US11734817
申请日：2007-04-13
IPC分类号： G11B7/00
CPC分类号： G11B7/131 , G11B7/0912 , G11B7/0943 , G11B2007/0013
摘要： When recording/reproducing an optical disc having a recording layer of multi-layer structure, an unwanted optical beam reflected from a recording layer other than a target layer for recording/reproduction is incident on a photodetector to cause an unwanted disturbance component to leak to a detection signal, giving rise to a degradation in the quality of a tracking control signal. In an optical pickup apparatus, for suppression of the degradation, an optical element is mounted having a diffraction area for diffracting part of the optical beam and light receiving planes for sub-optical beams are provided each of which has a light shielding zone or dead zone of a predetermined width on its central sectioning line.
摘要翻译： 当记录/再现具有多层结构的记录层的光盘时，从用于记录/再现的目标层以外的记录层反射的不需要的光束入射到光电检测器上，以使不需要的干扰成分泄漏到 检测信号，导致跟踪控制信号的质量下降。 在用于抑制劣化的光学拾取装置中，安装具有用于衍射光束的一部分的衍射区域的光学元件，并且每个具有遮光区域或死区的子光束的光接收平面 在其中心切片线上具有预定宽度。
-
公开(公告)号：US20060193217A1
公开(公告)日：2006-08-31
申请号：US11302540
申请日：2005-12-14
IPC分类号： G11B7/00
CPC分类号： G11B7/13925 , G11B7/1263 , G11B7/1378 , G11B2007/0006 , G11B2007/0013 , G11B2007/13727
摘要： An optical pickup and an optical information recording and reproducing device in which spherical aberration correction control after a disc is loaded can be efficiently made in a short time. Before an information recording medium is loaded into a drive, an optical axis direction position of a concave lens is preset to a state so as to optimize a converging spot on a recording surface of a single-layered medium of as a first recording medium or a predetermined layer (first layer having a substrate thickness of 0.1 mm) of a medium having two or more layers to which the recording/reproduction is executed by a laser light source. After the information recording medium is loaded, if it is determined to be a second (third) recording medium to which the recording/reproduction is executed by a laser light source, setting of the optical axis direction position of the concave lens is changed.
摘要翻译： 可以在短时间内有效地进行光盘拾取器和光盘信息记录和再现装置，其中装载光盘之后的球面像差校正控制。 在将信息记录介质装载到驱动器中之前，将凹透镜的光轴方向位置预先设定为使作为第一记录介质的单层介质的记录面上的会聚点优化的状态 具有由激光光源执行记录/再现的具有两层或多层的介质的预定层（具有0.1mm的基板厚度的第一层）。 在信息记录介质被加载之后，如果确定是由激光源执行记录/再现的第二（第三）记录介质，则改变凹透镜的光轴方向位置的设置。
-
46.发明授权Information reproducing method which reproduces plural components of a focus error signal and a tracking error signal from plural detection regions of plural reflected light beams 失效信息再现方法，其从多个反射光束的多个检测区域再现聚焦误差信号的多个分量和跟踪误差信号公开(公告)号：US06728173B2
公开(公告)日：2004-04-27
申请号：US10131225
申请日：2002-04-25
IPC分类号： G11B700
CPC分类号： G11B7/1353 , G11B7/00718 , G11B7/0903 , G11B7/0909 , G11B7/094 , G11B7/0941 , G11B7/0943 , G11B7/131 , G11B7/1367 , G11B7/1381 , G11B2007/0006
摘要： An information reproducing method for reproducing information recorded on a medium by irradiating a laser beam and detecting a reflected light beam from the medium. The method includes detecting a plurality of reflected light beams in which the polarities of variations in reflected light beam intensity distributions are substantially inverted to each other, the distribution variation being produced when a light spot of the laser beam crosses a track on the medium, generating components of a focus error signal and components of a tracking error signal, adding the components of the focus error signal of the plurality of reflected light beams to generate a focus error signal, and taking a difference between the components of the tracking error signal of the plurality of reflected light beams to generate a tracking error signal.
摘要翻译： 一种信息再现方法，用于通过照射激光束和从介质检测反射光来再现记录在介质上的信息。 该方法包括检测多个反射光束，其中反射光束强度分布的变化的极性基本上彼此反转，当激光束的光斑穿过介质上的光道时产生分布变化，产生 聚焦误差信号的分量和跟踪误差信号的分量，将多个反射光束的聚焦误差信号的分量相加以产生聚焦误差信号，并且获取光信号的跟踪误差信号的分量 多个反射光束产生跟踪误差信号。
-
47.发明授权Optical detector, optical pickup and optical information reproducing apparatus using optical pickup 有权光学检测器，光学拾取器和使用光学拾取器的光学信息再现装置公开(公告)号：US06567355B2
公开(公告)日：2003-05-20
申请号：US09726557
申请日：2000-12-01
IPC分类号： G11B700
CPC分类号： G11B7/131 , G11B7/0903 , G11B7/0909 , G11B7/0943 , G11B2007/0006
摘要： An optical pickup has a semiconductor laser having two laser sources of different wavelengths disposed in the same package, one diffraction grating and one optical detector. A plurality of light reception areas each having four divisional light reception planes of a -character shape are disposed at positions where light beams reflected from an optical disc are applied. A focus error signal is generated by an astigmatism method by using independently these light reception areas and a tracking error signal is generated by a differential phase detection method by using one or both the light reception areas.
摘要翻译： 光拾取器具有设置在相同封装中的两个具有不同波长的激光源的半导体激光器，一个衍射光栅和一个光学检测器。 多个光接收区域，每个光接收区域具有四个分开的光接收面，其具有
- 字符形状设置在从光盘反射的光束被施加的位置。 通过独立地使用这些光接收区域通过散光法产生聚焦误差信号，并且通过使用光接收区域中的一个或两个，通过差分相位检测方法生成跟踪误差信号。 -
48.发明授权公开(公告)号：US06507009B1
公开(公告)日：2003-01-14
申请号：US09347530
申请日：1999-07-06
申请人： Kunikazu Ohnishi , Takeshi Shimano , Shigeru Nakamura , Masayuki Inoue , Yukio Fukui , Yasuyuki Sugi , Shinji Fujita , Mitsuhiko Ota
发明人： Kunikazu Ohnishi , Takeshi Shimano , Shigeru Nakamura , Masayuki Inoue , Yukio Fukui , Yasuyuki Sugi , Shinji Fujita , Mitsuhiko Ota
IPC分类号： G02B704
CPC分类号： G11B7/131 , G11B7/00718 , G11B7/0901 , G11B7/0903 , G11B7/0909 , G11B7/094 , G11B7/0943
摘要： It is desirable to greatly reduce the disturbance that arises in a focusing error signal by a astigmatic detection method and offset that arises in the tracking error signal by a push-pull method when reproducing various information storing disks, such as a DVD-RAM disk. It is also desirable to provide an optical disk apparatus which is able to reproduce a variety of high density optical disks, such as DVD-RAM and DVD-ROM disks, as well as conventional disks, such as CD, CD-ROM, CD-R disks, by using a simple optional head. For this purpose, an optical disk apparatus irradiates three optical beams produced by a diffraction grating on the specified position of an optical disk and detects reflected light using a specified optical detector divided into twelve parts.
摘要翻译： 期望通过散像检测方法和再现各种信息存储盘（例如DVD-RAM盘）时通过推挽方法在跟踪误差信号中产生的偏移来大大降低在聚焦误差信号中产生的干扰。 还希望提供能够再现诸如DVD-RAM和DVD-ROM盘的各种高密度光盘以及诸如CD，CD-ROM，CD-ROM等常规盘的光盘装置， R盘，通过使用简单的可选头。 为此，光盘装置将由衍射光栅产生的三个光束照射在光盘的指定位置上，并使用分为十二部分的特定光学检测器检测反射光。
-
49.发明授权公开(公告)号：US06400664B1
公开(公告)日：2002-06-04
申请号：US09249290
申请日：1999-02-12
IPC分类号： G11B700
CPC分类号： G11B7/1353 , G11B7/00718 , G11B7/0903 , G11B7/0909 , G11B7/094 , G11B7/0941 , G11B7/0943 , G11B7/131 , G11B7/1367 , G11B7/1381 , G11B2007/0006
摘要： An optical head eliminates an disturbance which occurs in a focus error signal in association with the decentering of an optical disk when an optical spot crosses a track on a storage film surface, and in addition the optical head cancels an off-set which occurs in a tracking error signal in association with the movement of an objective lens. In the constitution of the optical head, phases of wave surfaces of ±1st order diffracted lights are shifted by an amount of &lgr;/2 with a common period by using a phase-inverted diffraction grating the phase of which is inverted with a period of D &lgr;/(2P . NA) in a radial direction of the optical disk, thus causing, on the optical disk, sub-spots to be located on the same track as a main-spot. Taking advantage of this location, focal point shift error signals of the main-spot and the sub-spots are added to each other with an appropriate gain ratio, thereby making it possible to cancel the disturbance which occurs in the focus error signal. Meanwhile, tracking error signals of the main-spot and the sub-spots according to a push-pull method are subtracted from each other with an appropriate gain ratio, thereby making it possible to cancel the off-set.
摘要翻译： 当光点穿过存储膜表面上的轨道时，光头消除了在与光盘的偏心相关联的聚焦误差信号中发生的干扰，此外，光学头消除了发生在 与物镜的移动相关的跟踪误差信号。 在光头的结构中，±1级衍射光的波面的相位通过使用相位相反的衍射光栅以公共周期偏移量，其相位相位与D的周期反转 羔羊/（2P.NA）在光盘的径向方向上，从而在光盘上使得子点位于与主光点相同的轨道上。 利用该位置，以适当的增益比将主点和子点的焦点偏移误差信号相加，从而可以消除在聚焦误差信号中发生的干扰。 同时，以适当的增益比相减，根据推挽方法将主点和子点的跟踪误差信号相减，从而可以消除偏移。
-
公开(公告)号：US6125087A
公开(公告)日：2000-09-26
申请号：US965448
申请日：1997-11-06
申请人： Kunikazu Ohnishi , Masayuki Inoue , Tohru Sasaki , Yukio Fukui , Takeshi Nakao , Takeshi Shimano
发明人： Kunikazu Ohnishi , Masayuki Inoue , Tohru Sasaki , Yukio Fukui , Takeshi Nakao , Takeshi Shimano
CPC分类号： G11B7/131 , G11B7/0901 , G11B7/123 , G11B7/1353 , G11B2007/0006 , G11B7/0908 , G11B7/0916 , G11B7/0943
摘要： Disclosed is an optical pickup and an optical disc device using the same, each including a laser diode, a photo-detector having a region divided into at least six photo-detection areas, and a diffraction grating disposed between the laser diode and the photo-detector and having a region divided into four areas by cross-shaped division lines. The diffraction grating divides a light beam reflected from an optical disc into four diffracted light beams. A focus error signal in accordance with a knife edge method and two kinds of tracking error signals in accordance with a push-pull method and a differential phase detection method are detected by irradiating the light beams diffracted at the areas of the diffraction grating on the detection areas of the photo-detector and/or at boundary lines therebetween, and arithmetically operating light intensity signals obtained from the detection areas of the photo-detector. As a result, there can be realized an optical pickup and an optical disc device, each of which can be matched with various optical discs different in structure by detecting a tracking error signal in accordance with the push-pull method and a tracking error signal suitable for a read only disc using only one photo-detector. Further, in the present invention, a holographic element can be used as the diffraction grating.
摘要翻译： 公开了一种光拾取器和使用该光拾取器的光盘装置，每个光拾取器和光盘装置均包括激光二极管，具有被划分为至少六个光检测区域的区域的光检测器，以及设置在激光二极管和光电二极管之间的衍射光栅， 并且具有通过十字形划分线划分成四个区域的区域。 衍射光栅将从光盘反射的光束分成四个衍射光束。 通过将衍射光栅衍射的光束照射在检测器上来检测根据刀刃法的聚焦误差信号和根据推挽法和差分相位检测方法的两种跟踪误差信号 光检测器的区域和/或其间的边界线，以及从光检测器的检测区域获得的算术运算光强度信号。 结果，可以实现光拾取器和光盘装置，其中的每一个可以通过根据推挽方法检测跟踪误差信号和适合的跟踪误差信号而与结构不同的各种光盘匹配 对于仅使用一个光电检测器的只读光盘。 此外，在本发明中，可以使用全息元件作为衍射光栅。
-
-
-
-
-
-
-
-
-
搜索结果
66 条记录 (耗时 0.028 秒)
