公开(公告)号：US06218655B1

公开(公告)日：2001-04-17

申请号：US09271624

申请日：1999-03-17

申请人： Masakazu Ogasawara ,  Sakashi Ohtaki ,  Kiyoshi Tateishi

发明人： Masakazu Ogasawara ,  Sakashi Ohtaki ,  Kiyoshi Tateishi

IPC分类号： G02B2740

CPC分类号： G11B7/1353 ,  G11B7/005 ,  G11B7/0901 ,  G11B7/131

摘要： An optical pickup for irradiating a light beam onto an information recording medium and receiving a light reflected by the medium, includes a light source for emitting a light beam, and a liquid crystal panel for diffracting the light beam to produce a main beam and a plurality of sub-beams to be irradiated on the medium. The liquid crystal panel included a first area in which a first group of grating patterns with predetermined pitches is formed and a second area in which a second group of grating patterns having the predetermined pitches is formed, and the first group of grating patterns and the second group of grating patterns are arranged on a plane with a gap area formed between the first area and the second area so as to form an integrated grating pattern. The optical pickup further includes a control unit for applying a first voltage to the first area to control a refractive index of the first area and applying a second voltage to the second area to control a refractive index of the second area, thereby to control a diffraction characteristic of the integrated grating pattern.

摘要翻译： 用于将光束照射到信息记录介质上并接收由介质反射的光的光学拾取器包括用于发射光束的光源和用于衍射光束以产生主光束的多个液晶面板和多个 的子光束照射在介质上。 液晶面板包括其中形成具有预定间距的第一组光栅图案的第一区域和形成具有预定间距的第二组光栅图案的第二区域，并且第一组光栅图案和第二组光栅图案 光栅图案组布置在平面上，在第一区域和第二区域之间形成有间隙区域，以形成集成的光栅图案。 光拾取器还包括控制单元，用于向第一区域施加第一电压以控制第一区域的折射率并向第二区域施加第二电压以控制第二区域的折射率，由此控制衍射 集成光栅图案的特点。

公开(公告)号：US5859818A

公开(公告)日：1999-01-12

申请号：US899334

申请日：1997-07-23

申请人： Kiyoshi Tateishi ,  Sakashi Ohtaki ,  Noriaki Murao

发明人： Kiyoshi Tateishi ,  Sakashi Ohtaki ,  Noriaki Murao

IPC分类号： G11B7/095 ,  G11B7/125 ,  G11B7/135 ,  G11B7/00

CPC分类号： G11B7/0956 ,  G11B7/1369 ,  G11B7/13927

摘要： A tilt servo apparatus in an optical disc reproducing apparatus operates promptly and certainly when reading recording information of an optical disc recorded at high density. The tilt servo apparatus is used in an optical disc reproducing apparatus having an optical pickup including a liquid crystal panel for an aberration correction on which a transparent electrode is formed and divided into segments of predetermined shapes, and irradiating a laser beam via the liquid crystal panel for the aberration correction and the objective lens, and receiving an obtained reflection light. The tilt servo apparatus has: tilt detecting for detecting a signal corresponding to a tilting angle in a radial direction between the information recording surface of the optical disc and an optical axis of the objective lens; and a driving circuit for variably driving voltages which are applied to the divided portions of the liquid crystal panel, respectively. The driving circuit drives so that predetermined voltages are applied to the respective divided segments of the liquid crystal panel according to a detection output of the tilt detecting and a phase difference between respective laser beams passing through the divided portions is adjusted, thereby correcting the aberration of the objective lens inclined at the tilting angle relative to the information recording surface of the optical disc.

摘要翻译： 当读取以高密度记录的光盘的记录信息时，光盘再现装置中的倾斜伺服装置操作迅速且肯定。 倾斜伺服装置用于具有光拾取器的光盘再现装置，该光学拾取器包括用于像差校正的液晶面板，其上形成有透明电极并被分成预定形状的段，并且经由液晶面板照射激光束 用于像差校正和物镜，并且接收所获得的反射光。 倾斜伺服装置具有：用于检测与光盘的信息记录表面和物镜的光轴之间的径向倾斜角相对应的信号的倾斜检测; 以及用于分别施加到液晶面板的分割部分的可变驱动电压的驱动电路。 驱动电路驱动，使得根据倾斜检测的检测输出将预定电压施加到液晶面板的各个分割段，并且调节通过分割部分的各个激光束之间的相位差，从而校正 物镜相对于光盘的信息记录表面倾斜倾斜角度。

公开(公告)号：US06801491B1

公开(公告)日：2004-10-05

申请号：US09511547

申请日：2000-02-23

申请人： Masakazu Ogasawara ,  Takuma Yanagisawa ,  Sakashi Ohtaki

发明人： Masakazu Ogasawara ,  Takuma Yanagisawa ,  Sakashi Ohtaki

IPC分类号： G11B700

CPC分类号： G11B7/131 ,  G11B7/0909 ,  G11B7/0943 ,  G11B7/1381 ,  G11B2007/0006

摘要： A focus error detecting apparatus and a focus error detecting method of an optical pickup in which the system is not easily influenced by track transversal noises and an optical disc thickness error and which can be used together with a 3-beam system or a DPD system. The return light from an optical disc is divided to a first optical path and a second optical path by a hologram device, a predetermined astigmatism is applied to the light on each divided optical path, the light is received and detected by a first detector and a second detector, and a focusing error signal is obtained by predetermined arithmetic operations. The return light from the optical disc is divided to the first optical path P1 and the second optical path P2 by a lens device constructed by combining eccentric cylindrical lenses, a predetermined astigmatism is applied to the light on each divided optical path, the light is received and detected by a first detector and a second detector each having photosensing portions divided into four portions by dividing lines having a lightning shape, and a focusing error signal is obtained by predetermined arithmetic operations.

摘要翻译： 光学拾取器的聚焦误差检测装置和聚焦误差检测方法，其中系统不容易受到轨道横向噪声和光盘厚度误差的影响，并且可以与三光束系统或DPD系统一起使用。 来自光盘的返回光被全息装置分割为第一光路和第二光路，对每个划分的光路上的光施加预定的散光，由第一检测器和第二检测器接收和检测光 第二检测器，并且通过预定的算术运算获得聚焦误差信号。 通过将偏心柱面透镜组合而构成的透镜装置将来自光盘的返回光分成第一光路P1和第二光路P2，对每条划分的光路上的光施加预定的像散，接收光 并且由具有闪电形状的划分线的具有被分成四部分的光敏部分的第一检测器和第二检测器检测，并且通过预定的算术运算获得聚焦误差信号。

公开(公告)号：US20060140072A1

公开(公告)日：2006-06-29

申请号：US11357111

申请日：2006-02-21

申请人： Makoto Sato ,  Sakashi Ohtaki

发明人： Makoto Sato ,  Sakashi Ohtaki

IPC分类号： G11B7/00

CPC分类号： G11B7/13927 ,  G11B7/0948 ,  G11B7/1378 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical pickup records information on an optical recording medium and retrieves information from the optical recording medium by radiating a light beam on the optical recording medium. The optical pickup includes a light source which emits the light beam. The optical pickup also includes an object lens which directs the convergent light beam to a recording layer of the optical recording medium. The optical pickup further includes an aberration correction lens assembly located between the light source and the object lens. The aberration correction lens assembly includes at least one movable lens which is movable in an optical axis direction. The aberration correction lens assembly moves the movable lens to convert the light beam to a convergent light beam or a divergent light beam so as to correct spherical aberration. A distance between a principal plane of the aberration correction lens assembly on a light emergent side and a principal plane of the object lens falls within a range determined in accordance with a numerical aperture of the object lens, a focal length of the aberration correction lens assembly on the light emergent side, and a focal length of the object lens.

公开(公告)号：US07054252B2

公开(公告)日：2006-05-30

申请号：US10227480

申请日：2002-08-26

申请人： Makoto Sato ,  Sakashi Ohtaki

发明人： Makoto Sato ,  Sakashi Ohtaki

IPC分类号： G11B7/135

CPC分类号： G11B7/13927 ,  G11B7/0948 ,  G11B7/1378 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical pickup records information on an optical recording medium and retrieves information from the optical recording medium by radiating a light beam on the optical recording medium. The optical pickup includes a light source which emits the light beam. The optical pickup also includes an object lens which directs the convergent light beam to a recording layer of the optical recording medium. The optical pickup further includes an aberration correction lens assembly located between the light source and the object lens. The aberration correction lens assembly includes at least one movable lens which is movable in an optical axis direction. The aberration correction lens assembly moves the movable lens to convert the light beam to a convergent light beam or a divergent light beam so as to correct spherical aberration. A distance between a principal plane of the aberration correction lens assembly on a light emergent side and a principal plane of the object lens falls within a range determined in accordance with a numerical aperture of the object lens, a focal length of the aberration correction lens assembly on the light emergent side, and a focal length of the object lens.

摘要翻译： 光学拾取器记录关于光学记录介质的信息，并通过在光学记录介质上照射光束从光学记录介质检索信息。 光学拾取器包括发射光束的光源。 光学拾取器还包括将会聚光束引导到光学记录介质的记录层的物镜。 光学拾取器还包括位于光源和物镜之间的像差校正透镜组件。 像差校正透镜组件包括可沿光轴方向移动的至少一个可移动透镜。 像差校正透镜组件移动可移动透镜以将光束转换成会聚光束或发散光束，以校正球面像差。 像差校正透镜组件在光出射侧的主平面与物镜的主平面之间的距离落入根据物镜的数值孔径确定的范围内，像差校正透镜组件的焦距 在光出射侧，以及物镜的焦距。

公开(公告)号：US06373807B1

公开(公告)日：2002-04-16

申请号：US09391178

申请日：1999-09-08

申请人： Sakashi Ohtaki ,  Ikuya Kikuchi

发明人： Sakashi Ohtaki ,  Ikuya Kikuchi

IPC分类号： G11B700

CPC分类号： G11B7/1374 ,  G11B7/1378 ,  G11B7/13922

摘要： An optical pickup includes a light source for emitting more than two light beams whose wavelengths are different from each other, and an objective lens including a first lens and a second lens. The first lens is a lens for collecting each light beam onto a recording medium. The second lens is a lens for compensating chromatic aberration in the light beams. The second lens is placed on the first lens in contact and is located across the optical path of each light beam. The absolute value of the difference between the Abbe number of the first lens and the Abbe number of the second lens is greater than 10.

摘要翻译： 光拾取器包括用于发射波长彼此不同的两个以上的光束的光源和包括第一透镜和第二透镜的物镜。 第一透镜是用于将每个光束收集到记录介质上的透镜。 第二透镜是用于补偿光束中的色差的透镜。 第二透镜被放置在接触的第一透镜上并且位于每个光束的光路两侧。 第一透镜的阿贝数与第二透镜的阿贝数之差的绝对值大于10。

公开(公告)号：US07417939B2

公开(公告)日：2008-08-26

申请号：US11357111

申请日：2006-02-21

申请人： Makoto Sato ,  Sakashi Ohtaki

发明人： Makoto Sato ,  Sakashi Ohtaki

IPC分类号： G11B7/00

CPC分类号： G11B7/13927 ,  G11B7/0948 ,  G11B7/1378 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical pickup records information on an optical recording medium and retrieves information from the optical recording medium by radiating a light beam on the optical recording medium. The optical pickup includes a light source which emits the light beam. The optical pickup also includes an object lens which directs the convergent light beam to a recording layer of the optical recording medium. The optical pickup further includes an aberration correction lens assembly located between the light source and the object lens. The aberration correction lens assembly includes at least one movable lens which is movable in an optical axis direction. The aberration correction lens assembly moves the movable lens to convert the light beam to a convergent light beam or a divergent light beam so as to correct spherical aberration. A distance between a principal plane of the aberration correction lens assembly on a light emergent side and a principal plane of the object lens falls within a range determined in accordance with a numerical aperture of the object lens, a focal length of the aberration correction lens assembly on the light emergent side, and a focal length of the object lens.

摘要翻译： 光学拾取器记录关于光学记录介质的信息，并通过在光学记录介质上照射光束从光学记录介质检索信息。 光学拾取器包括发射光束的光源。 光学拾取器还包括将会聚光束引导到光学记录介质的记录层的物镜。 光学拾取器还包括位于光源和物镜之间的像差校正透镜组件。 像差校正透镜组件包括可沿光轴方向移动的至少一个可移动透镜。 像差校正透镜组件移动可移动透镜以将光束转换成会聚光束或发散光束，以校正球面像差。 像差校正透镜组件在光出射侧的主平面与物镜的主平面之间的距离落入根据物镜的数值孔径确定的范围内，像差校正透镜组件的焦距 在光出射侧，以及物镜的焦距。

公开(公告)号：US06449095B1

公开(公告)日：2002-09-10

申请号：US09665075

申请日：2000-09-19

申请人： Sakashi Ohtaki ,  Noriaki Murao

发明人： Sakashi Ohtaki ,  Noriaki Murao

IPC分类号： G02B2744

CPC分类号： G11B7/1353 ,  G02B5/1876 ,  G11B7/127 ,  G11B2007/0006

摘要： An optical pickup is disclosed which includes a first light source for emitting a first beam of light with a first wavelength; a second light source for emitting a second beam of light with a second wavelength, longer than the first wavelength; a condenser lens for condensing the first and second beam of light onto an information recording surface of a recording medium; and a diffractive optical element arranged in an optical path from the first and second light source to the condenser lens. The condenser lens condenses, for the first beam of light, a refracted beam of the first diffraction order of the first beam of light by means of the diffractive optical element as an information read beam or an information write beam. For the second beam of light, the condenser lens condenses a refracted beam of the second diffraction order, lower than the first diffraction order, of the second beam of light by means of the diffractive optical element as an information read beam or an information write beam.

摘要翻译： 公开了一种光学头，其包括用于发射具有第一波长的第一光束的第一光源; 第二光源，用于发射长于第一波长的第二波长的第二光束; 聚光透镜，用于将第一和第二光束聚光到记录介质的信息记录表面上; 以及衍射光学元件，其设置在从第一和第二光源到聚光透镜的光路中。 对于第一光束，聚光透镜通过作为信息读取光束或信息写入光束的衍射光学元件将第一光束的第一衍射级的折射光束冷凝。 对于第二光束，聚光透镜通过作为信息读取光束或信息写入光束的衍射光学元件将第二光束的第二衍射级的折射光束比第一衍射级别低 。