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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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62.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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63.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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公开(公告)号：US4768183A
公开(公告)日：1988-08-30
申请号：US87345
申请日：1987-08-20
申请人： Kunikazu Ohnishi , Akira Arimoto , Masayuki Inoue , Yukio Fukui
发明人： Kunikazu Ohnishi , Akira Arimoto , Masayuki Inoue , Yukio Fukui
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/12
摘要： Light beam emitted from a laser light source is focused by an objective lens and applied in this state to an optical information recording medium. In the optical path between the laser light source and the objective lens is disposed a diffraction grating inclinedly with respect to the optical axis. This diffraction grating not only reflects the light beam emitted from the laser light source but also separates it into zero order as well as +1st order and -1st order diffracted light beams. Thus, this diffraction grating functions not only as a diffraction grating but also as a mirror. The thus-separated light beams are applied to an optical disc and the reflected light beams from the optical disc are converted to electric signals by means of a photo detector. The .+-.1st order diffracted light beams are used as track servo beams for following the track on the disc. The zero order diffracted light beam is used for reproducing information signals provided from the track on the disc. The diffraction grating has unequally spaced, curvilinear grooves in order to solve the problems of wave front aberration and light spot aberration which are induced by letting the diffraction grating function as both a diffraction grating and a mirror.
摘要翻译： 从激光光源射出的光束被物镜聚焦，并以此状态应用于光信息记录媒体。 在激光光源和物镜之间的光路中设置相对于光轴倾斜的衍射光栅。 该衍射光栅不仅反射从激光光源发射的光束，而且将其分离为零级以及+ 1级和-1级衍射光束。 因此，该衍射光栅不仅用作衍射光栅，而且还用作反射镜。 这样分离的光束被施加到光盘，并且来自光盘的反射光束通过光电检测器转换成电信号。 +/- 1级衍射光束用作跟踪光盘上的轨道的轨道伺服光束。 零级衍射光束用于再现从光盘上的轨道提供的信息信号。 衍射光栅具有不等间距的曲线槽，以解决通过使衍射光栅作为衍射光栅和反射镜两者而引起的波前像差和光斑像差的问题。
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