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51.发明授权Recording/reproducing optical head producing focusing error signal from zero-th order diffracted light and tracking error signal from first order diffracted light 失效从零级衍射光产生聚焦误差信号的记录/再现光头和来自一级衍射光的跟踪误差信号
公开(公告)号：US5404344A
公开(公告)日：1995-04-04
申请号：US154482
申请日：1993-11-19
申请人： Nobuo Imada , Kunikazu Ohnishi , Tohru Sasaki , Masayuki Inoue , Akira Arimoto , Shigeru Nakamura , Takeshi Nakao
发明人： Nobuo Imada , Kunikazu Ohnishi , Tohru Sasaki , Masayuki Inoue , Akira Arimoto , Shigeru Nakamura , Takeshi Nakao
CPC分类号： G11B7/09 , G11B7/131 , G11B7/1353
摘要： A recording/reproducing optical head capable of causing a light spot on a photodetector for detecting a focusing error signal to stand still without being affected by variations in wavelength of light used, capable of adjusting a tracking error signal independently of the focusing error signal, and capable of utilizing light having an order of diffraction of -1 for the purpose of detecting a signal, in which a cylindrical lens for generating astigmatism and a diffraction grating made up of two regions different in the direction of diffraction or the angle of diffraction from each other are interposed between a beam splitter and a photodetector, a light beam diffracted from the diffraction grating and including the diffracted light of the zero-th order (that is, light which has passed through the diffraction grating without being deflected) is received by the photodetector, the diffracted light of the zero-th order is used for detecting a focusing error signal according to the astigmatism method, and diffracted light having an order of diffraction of +1 and diffracted light having an order of diffraction of -1 are used for detecting a tracking error signal.
摘要翻译： 一种记录/再现光学头，其能够使光检测器上的光点用于检测聚焦误差信号静止而不受所用光波长的变化的影响，能够独立于聚焦误差信号调整跟踪误差信号;以及 能够利用衍射次数为-1的光来检测信号，其中用于产生像散的柱面透镜和衍射光栅由衍射方向不同的两个区域或每个衍射方向衍射的角度构成 另外设置在分束器和光电检测器之间，从衍射光栅衍射的光束并且包括零级的衍射光（即，已经通过衍射光栅而不被偏转的光）被 光电检测器，零级的衍射光用于根据散光检测聚焦误差信号 sm方法，衍射次数为+1的衍射光和衍射级数为-1的衍射光用于检测跟踪误差信号。
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公开(公告)号：US08331207B2
公开(公告)日：2012-12-11
申请号：US12074968
申请日：2008-03-07
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0912 , G11B7/131 , G11B7/133 , G11B2007/0013
摘要： For use with a multi-layer optical disc, an optical pickup 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 with an optical pickup that produces a tracking error signal and a focus error signal from a difference signal based on polarized reflected light.
摘要翻译： 为了与多层光盘一起使用，光学拾取器可以消除由于信号光束与来自多个光盘的另一个记录表面的返回光束的干扰而导致聚焦误差信号和跟踪误差信号波动的问题 在利用光学拾取器进行再现期间的光盘，其从基于偏振反射光的差分信号产生跟踪误差信号和聚焦误差信号。
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公开(公告)号：US20100322047A1
公开(公告)日：2010-12-23
申请号：US12826827
申请日：2010-06-30
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。
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公开(公告)号：US07724626B2
公开(公告)日：2010-05-25
申请号：US11905533
申请日：2007-10-02
IPC分类号： G11B7/135
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.
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公开(公告)号：US20100124161A1
公开(公告)日：2010-05-20
申请号：US12693042
申请日：2010-01-25
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。
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公开(公告)号：US20080031104A1
公开(公告)日：2008-02-07
申请号：US11905529
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.
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57.发明申请Photodetector, diffraction grating, optical pickup and optical disc apparatus 有权光电检测器，衍射光栅，光学拾取器和光盘装置公开(公告)号：US20070019530A1
公开(公告)日：2007-01-25
申请号：US11369077
申请日：2006-03-07
IPC分类号： G11B7/00
CPC分类号： G11B7/131 , G11B7/1275 , G11B7/1353 , G11B2007/0006
摘要： The present invention provides a photodetector capable of generating highly accurate tracking and focusing error signals free of variations in light quantity caused by interference, in an optical pickup with a two-wavelength multilaser. The photodetector comprises first three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a first wavelength and second three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a second wavelength longer than the first wavelength. The distance between both-end light receiving areas out of the first three light receiving areas is longer than the distance between both-end light receiving areas out of the second three light receiving areas.
摘要翻译： 本发明提供了一种能够在具有双波长多光盘的光学拾取器中产生高精度的跟踪和聚焦误差信号的光检测器，该误差信号不受干扰引起的光量的变化。 光电检测器包括前三个光接收区域，线性地布置以接收三个光束，分别由从第一波长的激光光源发射的光束分裂，并且第二三个光线接收区域被线性地分配以接收分别由分裂产生的三个光束 从比第一波长长的第二波长的激光光源发射的光束。 在前三个光接收区域中的两端光接收区域之间的距离比第二三个光接收区域中的两端光接收区域之间的距离长。
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58.发明申请公开(公告)号：US20060193219A1
公开(公告)日：2006-08-31
申请号：US11334453
申请日：2006-01-19
IPC分类号： G11B7/00
CPC分类号： G11B7/131 , G11B7/08505 , G11B7/0903 , G11B7/1353 , G11B2007/0006
摘要： An optical pickup device is provided which reduces variations in amplitude of a tracking error signal in a seek operation due to an installation error of the optical pickup device onto an optical disk apparatus, thereby generating the tracking error signal with high accuracy without any influence from stray lights, and which is high in productivity and low cost. Two sub-light beams are focused on at least one of forward and backward sides in a rotational direction of the disk with respect to a main light beam focused on the disk. When n is an integer number, and t is a distance between guide grooves of the disk, the two sub-light beams focused are spaced apart from each other by a distance of t×(n+0.5) in the radial direction of the optical disk. As splitting means for splitting the light beams into a plurality of beams, a diffraction grating is used which has grid grooves spaced apart at equal intervals, but having different angles at the upper and lower parts of an exiting surface of the light beam.
摘要翻译： 提供了一种光学拾取装置，其由于光学拾取装置在光盘装置上的安装误差而减少寻道操作中的跟踪误差信号的幅度变化，从而以高精度产生跟踪误差信号，而不受杂散影响 灯具，生产效率高，成本低。 两个子光束相对于聚焦在盘上的主光束在盘的旋转方向上的前后两者中的至少一个上聚焦。 当n是整数时，t是盘的引导槽之间的距离，所聚焦的两个子光束在光盘的径向上彼此间隔开tx（n + 0.5）的距离 。 作为用于将光束分割为多个光束的分离装置，使用衍射光栅，其具有以相等的间隔间隔开的栅格槽，但在光束的出射表面的上部和下部具有不同的角度。
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公开(公告)号：US06934228B2
公开(公告)日：2005-08-23
申请号：US10827339
申请日：2004-04-20
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 having a semiconductor laser and a generation of a plurality of reflected light beams from an optical disk which have polarities of intensity distribution variations which are substantially inverted to each other when a periodic structure of the optical disk crosses at least one focused spot on the disk. An optical detection system splits the plurality of reflected light beams and detects the split reflected light beams. An electrical circuit provides a focus error signal of the at least one focused spot and a tracking error signal from the plurality of reflected light beams. The electrical circuit adds focus error signals provides a difference signal between the focus error signals, amplifies tracking error signals with a gain, and obtains a difference between amplified tracking error.
摘要翻译： 具有半导体激光器的光学头和从光盘产生多个具有强度分布变化的极性的多个反射光束的光头，当光盘的周期性结构与至少一个聚焦点交叉时，其基本上相互反转 磁盘。 光学检测系统分割多个反射光束并检测分离的反射光束。 电路提供至少一个聚焦点的聚焦误差信号和来自多个反射光束的跟踪误差信号。 电路增加聚焦误差信号在聚焦误差信号之间提供差分信号，用增益放大跟踪误差信号，并获得放大跟踪误差之间的差异。
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公开(公告)号：US5751680A
公开(公告)日：1998-05-12
申请号：US762436
申请日：1996-12-09
CPC分类号： G11B7/0956
摘要： Concerning a tilt detecting optical pickup in an optical disk playback device, a highly precise tilt error signal can be obtained by a simple structure. As a structure for achieving this, there are provided a diffraction grating, on which a grating groove pattern has been engraved, capable of adding coma aberration components to + and - primary diffracted light on an optical path between a laser diode, which becomes a playback light source, and an optical disk, and a light-receiving element capable of receiving the diffracted light. The output from a signal processing circuit capable of calculating a difference between each light receiving strength becomes a tilt error signal. By deforming the aforesaid grating groove pattern, the layout of the coma aberration components can be changed. Also, a tilt error signal can be obtained from a difference in bit error numbers in playback signals from diffracted light having coma aberration. Addition of coma aberration components to the diffracted light makes it possible to easily improve the sensitivity of a tilt error signal to the tilt angle.
摘要翻译： 关于光盘重放装置中的倾斜检测光学拾取器，可以通过简单的结构获得高精度的倾斜误差信号。 作为实现这一点的结构，提供了一种衍射光栅，其上刻有格栅槽图案，能够在成为回放的激光二极管之间的光路上将偏光成分加到+和 - 次衍射光上 光源和光盘，以及能够接收衍射光的光接收元件。 来自能够计算每个光接收强度之差的信号处理电路的输出成为倾斜误差信号。 通过使上述格栅凹槽图案变形，可以改变彗形像差分量的布局。 此外，可以从具有彗形像差的衍射光的重放信号中的位错误数的差异获得倾斜误差信号。 向衍射光添加彗形像差成分可以容易地提高倾斜误差信号对倾斜角的灵敏度。
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