公开(公告)号：US20100220576A1

公开(公告)日：2010-09-02

申请号：US11993121

申请日：2006-06-13

申请人： Ikuya Kikuchi ,  Masakazu Ogasawara ,  Takuma Yanagisawa

发明人： Ikuya Kikuchi ,  Masakazu Ogasawara ,  Takuma Yanagisawa

IPC分类号： G11B7/135

CPC分类号： G11B7/0901 ,  G11B7/0906 ,  G11B7/1353 ,  G11B7/1381

摘要： The present invention makes possible a compact optical pickup device that eliminates effects due to the position where a sub beam is projected during tracking compensation, and provides for stable tracking compensation.A diffraction grating 12 in the optical pickup device PU gives an astigmatism to a sub beam (either of ±1-dimensional light), and shines that sub beam onto an optical disc DK. Also, a tracking error signal Ste is obtained by subtracting a push-pull signal PPsub that corresponds to a sub beam from a push-pull signal PPmain that corresponds to a main beam (0-dimensional light), and tracking compensation is performed based on that tracking error signal Ste.

摘要翻译： 本发明使得可以消除由于在跟踪补偿期间投影子光束的位置而产生的影响的紧凑型光学拾取装置，并提供稳定的跟踪补偿。 光学拾取装置PU中的衍射光栅12给子光束（±1维光）的散光，并将该子光束照射到光盘DK上。 此外，通过从对应于主波束（0维光）的推挽信号PPmain中减去与子波对应的推挽信号PPsub来获得跟踪误差信号Ste，并且基于 跟踪误差信号Ste。

公开(公告)号：US07016269B2

公开(公告)日：2006-03-21

申请号：US10022843

申请日：2001-12-20

申请人： Masakazu Ogasawara ,  Ikuya Kikuchi

发明人： Masakazu Ogasawara ,  Ikuya Kikuchi

IPC分类号： G11B7/00

CPC分类号： G11B7/133 ,  G11B7/08511 ,  G11B7/0909 ,  G11B7/0912 ,  G11B7/094 ,  G11B7/0943 ,  G11B7/0946 ,  G11B7/131 ,  G11B2007/0013

摘要： An optical pickup apparatus having an irradiation optical system for condensing a light beam on a track of a recording plane and a photodetection optical system for guiding return light to a photodetector to detect a focal error includes a holographic lens provided in the optical path of the return light for outputting 0-th and ±1st order diffracted lights based on the return light; an optical element provided in front of or behind the holographic lens for providing astigmatism; photodetectors for receiving the 0-th and ±1st order diffracted lights; and servo-signal generating operation circuits connected to the photodetectors for generating a first and second focus error signals having a first and second capture ranges based on the output signal of the photodetector.

公开(公告)号：US20080232203A1

公开(公告)日：2008-09-25

申请号：US10593649

申请日：2005-03-17

申请人： Masakazu Ogasawara ,  Makoto Sato ,  Ikuya Kikuchi

发明人： Masakazu Ogasawara ,  Makoto Sato ,  Ikuya Kikuchi

IPC分类号： G11B7/00

CPC分类号： G11B7/1353 ,  G11B7/0948 ,  G11B7/1275 ,  G11B7/13927 ,  G11B2007/0006

摘要： An optical pickup projects laser beams having the first to the third wavelengths, in response to the type of a recording medium which is an object to which recording or reproduction is to be performed, and reflecting light from the recording medium is received by a light-detecting element. In order to reduce the sizes of the optical pickup, light of the second and the third wavelengths is generated by a single dual-wavelength light source, and reflecting light of all the wavelengths is to be received by the single light-detecting element. A hologram element giving different optical effects to light of each wavelength is arranged between the light irradiating means and the light-detecting element. Thus, appropriate information recording and reproduction can be performed by using light of each wavelength.

摘要翻译： 响应于要进行记录或再现的对象的记录介质的类型，并且来自记录介质的光被反射光接收，光拾取器投射具有第一至第三波长的激光束， 检测元件。 为了减小光学拾取器的尺寸，通过单个双波长光源产生第二和第三波长的光，并且所有波长的反射光将被单个光检测元件接收。 在光照射装置和光检测元件之间布置有对每个波长的光赋予不同光学效果的全息元件。 因此，可以通过使用每个波长的光来执行适当的信息记录和再现。

公开(公告)号：US20050122857A1

公开(公告)日：2005-06-09

申请号：US10995089

申请日：2004-11-23

申请人： Makoto Sato ,  Masakazu Ogasawara ,  Ikuya Kikuchi ,  Katsuhiro Koike

发明人： Makoto Sato ,  Masakazu Ogasawara ,  Ikuya Kikuchi ,  Katsuhiro Koike

IPC分类号： G11B7/09 ,  G11B7/00 ,  G11B7/125 ,  G11B7/1275 ,  G11B7/135 ,  G11B7/1369 ,  G11B7/1376 ,  G11B7/1392

CPC分类号： G11B7/13925 ,  G11B7/1275 ,  G11B7/1369 ,  G11B7/1376 ,  G11B2007/0006

摘要： When recording/reading information data onto/from a recording medium by irradiating the recording medium with a first light beam, correction for decreasing the amount of spherical aberration is made just before the recording or reading. On the other hand, when recording/reading information data onto/from a recording medium by irradiating the recording medium with a second light beam, focus correction for correctly condensing the reflected light from the recording medium on the light receiving surface of a photodetector is made just before the recording or reading.

摘要翻译： 当通过用第一光束照射记录介质来记录/读取记录介质上的信息数据时，在记录或读取之前进行用于减小球面像差量的校正。 另一方面，当通过用第二光束照射记录介质来将信息数据记录/从记录介质读取信息数据时，进行用于将来自记录介质的反射光正确地聚集在光电检测器的光接收表面上的聚焦校正 就在录音或阅读之前。

公开(公告)号：US07453787B2

公开(公告)日：2008-11-18

申请号：US10593649

申请日：2005-03-17

申请人： Masakazu Ogasawara ,  Makoto Sato ,  Ikuya Kikuchi

发明人： Masakazu Ogasawara ,  Makoto Sato ,  Ikuya Kikuchi

IPC分类号： G11B7/00

CPC分类号： G11B7/1353 ,  G11B7/0948 ,  G11B7/1275 ,  G11B7/13927 ,  G11B2007/0006

摘要： An optical pickup projects laser beams having the first to the third wavelengths, in response to the type of a recording medium which is an object to which recording or reproduction is to be performed, and reflecting light from the recording medium is received by a light-detecting element. In order to reduce the sizes of the optical pickup, light of the second and the third wavelengths is generated by a single dual-wavelength light source, and reflecting light of all the wavelengths is to be received by the single light-detecting element. A hologram element giving different optical effects to light of each wavelength is arranged between the light irradiating means and the light-detecting element. Thus, appropriate information recording and reproduction can be performed by using light of each wavelength.

摘要翻译： 响应于要进行记录或再现的对象的记录介质的类型，并且来自记录介质的光被反射光接收，光拾取器投射具有第一至第三波长的激光束， 检测元件。 为了减小光学拾取器的尺寸，通过单个双波长光源产生第二和第三波长的光，并且所有波长的反射光将被单个光检测元件接收。 在光照射装置和光检测元件之间布置有对每个波长的光赋予不同光学效果的全息元件。 因此，可以通过使用每个波长的光来执行适当的信息记录和再现。

公开(公告)号：US07139234B2

公开(公告)日：2006-11-21

申请号：US10713038

申请日：2003-11-17

申请人： Masakazu Ogasawara ,  Ikuya Kikuchi

发明人： Masakazu Ogasawara ,  Ikuya Kikuchi

IPC分类号： G11B7/135

CPC分类号： G11B7/1369 ,  G11B7/1353 ,  G11B7/13927 ,  G11B2007/0006

摘要： An optical pickup is provided for recording and reproduction of information onto and from an optical disk. In the optical disk, in a forward optical path, a single polarized optical beam is converted to plural polarized optical beams. Polarization modes of the plural polarized optical beams are then converted to a polarization mode suitable for one of the recording and the reproduction to produce polarization-converted optical beams and to radiate the polarization-converted optical beams to the disk. In the backward optical path, polarization modes of the polarization-converted optical beams reflected from the disk are returned to the same polarization mode as that of the plural polarized optical beams, so that plural polarized reflected optical beams are produced. Polarization modes of the plural polarized reflected optical beams are then returned to the same polarization mode as the single polarized optical mode.

摘要翻译： 提供了用于在光盘上记录和再现信息的光学拾取器。 在光盘中，在正向光路中，单个偏振光束被转换为多个偏振光束。 然后将多个偏振光束的极化模式转换为适合于记录和再现之一的偏振模式，以产生偏振转换的光束，并将偏振转换的光束辐射到光盘。 在反向光路中，从盘反射的偏振光转换光束的偏振模式返回到与多个偏振光束相同的偏振模式，从而产生多个偏振反射光束。 然后，多个偏振反射光束的极化模式返回到与单偏振光学模式相同的偏振模式。

公开(公告)号：US5892748A

公开(公告)日：1999-04-06

申请号：US611753

申请日：1996-03-06

申请人： Ikuya Kikuchi

发明人： Ikuya Kikuchi

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

CPC分类号： G11B7/1353 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An optical pickup reads or records information on a recording surface of a first optical record medium or a second optical record medium, each of which has a protection film different in thickness from each other. The optical pickup includes: a light beam source for emitting a light beam; a dividing unit for dividing the light beam into a non-diffracted light, which is a portion of the light beam other than diffracted lights, and a first order diffracted light; and a converging unit for converging the non-diffracted light and the first order diffracted light. Further, an optical path length between the light beam source and the converging unit is determined so that the non-diffracted light is converged onto the recording surface of the first optical record medium and a spherical aberration of the non-diffracted light converged onto the recording surface of the first optical record medium is minimized. And the dividing unit is constructed so that the first order diffracted light is converged onto the recording surface of the second optical record medium and a spherical aberration of the first order diffracted light converged onto the recording surface of the second optical record medium is minimized.

摘要翻译： 光学拾取器在第一光学记录介质或第二光学记录介质的记录表面上读取或记录信息，每个记录介质的厚度彼此不同。 光拾取器包括：用于发射光束的光束源; 分割单元，用于将光束分成不是衍射光的光束的一部分的非衍射光和一级衍射光; 以及用于会聚非衍射光和一级衍射光的会聚单元。 此外，确定光束源和会聚单元之间的光程长度，使得非衍射光会聚到第一光学记录介质的记录表面上，并且非衍射光的球面像差会聚到记录 第一光学记录介质的表面被最小化。 并且分割单元被构造成使得一级衍射光会聚到第二光学记录介质的记录表面上，并且会聚在第二光学记录介质的记录表面上的一级衍射光的球面像差被最小化。

公开(公告)号：US20150070770A1

公开(公告)日：2015-03-12

申请号：US14391706

申请日：2012-04-12

申请人： Takayuki Nomoto ,  Ikuya Kikuchi

发明人： Takayuki Nomoto ,  Ikuya Kikuchi

IPC分类号： G02B3/00 ,  G02B27/01

CPC分类号： G02B3/0043 ,  G02B3/0006 ,  G02B3/0056 ,  G02B27/0101 ,  G02B2027/0118

摘要： An optical element includes a microlens array on which plural microlenses are arranged. The microlens array includes plural areas whose microlenses have different curvature radii per area. The plural areas are configured so that the farther the area exists from the center of the microlens array, the smaller the curvature radius of the microlenses arranged on the area is.

摘要翻译： 光学元件包括其上布置有多个微透镜的微透镜阵列。 微透镜阵列包括多个区域，其微透镜每个面积具有不同的曲率半径。 多个区域被配置为使得该区域从微透镜阵列的中心越远，该区域上布置的微透镜的曲率半径越小。

公开(公告)号：US20070274188A1

公开(公告)日：2007-11-29

申请号：US10590849

申请日：2005-03-15

申请人： Ikuya Kikuchi

发明人： Ikuya Kikuchi

IPC分类号： G11B7/135

CPC分类号： G11B7/139 ,  G11B7/1378 ,  G11B7/24038 ,  G11B2007/0013

摘要： An optical pickup device including: a light source for emitting a light beam; a beam expander having a converging lens for converging a light beam, a light-shielding panel having a through-portion arranged at an optical conjugate position of an emission point of the light beam for allowing the converged light beam to pass through and a collimator lens for collimating the light beam passed through the through-portion; an objective lens for focusing the collimated light beam to the recording layer; and a light detector for detecting the light beam reflected by the recording medium and passed through the objective lens and the beam expander and generating the error signal and the reading data signal for controlling the focusing position.

摘要翻译： 一种光学拾取装置，包括：用于发射光束的光源; 具有用于会聚光束的会聚透镜的光束扩展器，具有布置在光束的发射点的光学共轭位置处的通过部分的光屏蔽板，用于允许会聚光束通过，准直透镜 用于准直穿过通孔的光束; 用于将准直光束聚焦到记录层的物镜; 以及光检测器，用于检测由记录介质反射并通过物镜和扩束器的光束，并产生用于控制聚焦位置的误差信号和读取数据信号。

公开(公告)号：US06992953B2

公开(公告)日：2006-01-31

申请号：US09813898

申请日：2001-03-22

申请人： Mitsuru Sato ,  Junichi Furukawa ,  Kazuo Takahashi ,  Takanori Maeda ,  Hiroshi Nishiwaki ,  Takayuki Nomoto ,  Ikuya Kikuchi

发明人： Mitsuru Sato ,  Junichi Furukawa ,  Kazuo Takahashi ,  Takanori Maeda ,  Hiroshi Nishiwaki ,  Takayuki Nomoto ,  Ikuya Kikuchi

IPC分类号： G11B7/095

CPC分类号： G11B7/1353 ,  G11B7/0901 ,  G11B7/0912 ,  G11B7/094 ,  G11B7/0941 ,  G11B7/0943 ,  G11B7/1381

摘要： A tracking servo apparatus in which reflection light obtained when a laser beam is irradiated onto a recording surface of an optical disc is photoelectrically converted, thereby obtaining a photoelectric conversion signal, a tracking error signal showing a deviation amount of an irradiating position of said laser beam for a track in a disc radial direction on the recording surface is generated by the photoelectric conversion signal, a spherical aberration occurring in an optical system is detected, a level of the tracking error signal is corrected on the basis of the detection result, and the irradiating position of the laser beam is moved in the disc radial direction in accordance with the level-corrected tracking error signal.

摘要翻译： 一种跟踪伺服装置，其中将激光束照射到光盘的记录表面上时获得的反射光被光电转换，从而获得光电转换信号，表示所述激光束的照射位置的偏差量的跟踪误差信号 通过光电转换信号产生在记录表面上的磁盘径向方向上的轨迹，检测出在光学系统中发生的球面像差，根据检测结果校正跟踪误差信号的电平，并且 根据电平校正的跟踪误差信号，激光束的照射位置沿盘径向移动。