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1. 发明授权

US6151154A Optical pickup, aberration correction unit and astigmatism measurement method 有权
标题翻译：光学拾取，像差校正单元和像散测量方法
公开(公告)号：US6151154A
公开(公告)日：2000-11-21
申请号：US265892
申请日：1999-03-11
申请人： Masakazu Ogasawara , Yoshitsugu Araki , Sakashi Ootaki , Junichi Furukawa , Kiyoshi Tateishi
发明人： Masakazu Ogasawara , Yoshitsugu Araki , Sakashi Ootaki , Junichi Furukawa , Kiyoshi Tateishi
IPC分类号： G02F1/1343 , G02F1/139 , G11B7/00 , G11B7/135 , G02F1/01
CPC分类号： G11B7/13925 , G02F1/134309 , G02F1/1393 , G11B7/1369 , G02F2203/18 , G11B2007/0006
摘要： An optical pickup includes: a light source, an object lens, and an aberration correction unit for correcting aberration by giving a phase difference to a light beam. The aberration correction unit corrects astigmatism caused by an optical system of the optical pickup.
摘要翻译：光学拾取器包括：光源，物镜，以及用于通过给光束赋予相位差来校正像差的像差校正单元。像差校正单元校正由光学拾取器的光学系统引起的像散。

2. 发明授权

US6078554A Wave-front aberration compensation unit, wave-front aberration compensation device, and optical pickup 失效
标题翻译：波前像差补偿单元，波前像差补偿装置和光学拾取器
公开(公告)号：US6078554A
公开(公告)日：2000-06-20
申请号：US848655
申请日：1997-04-29
申请人： Sakashi Ootaki , Masayuki Iwasaki , Masakazu Ogasawara
发明人： Sakashi Ootaki , Masayuki Iwasaki , Masakazu Ogasawara
IPC分类号： G02F1/01 , G02F1/13 , G11B7/00 , G11B7/095 , G11B7/125 , G11B7/135
CPC分类号： G11B7/0956 , G11B7/1369 , G11B7/13927 , G11B2007/0006 , G11B2007/13727 , G11B7/0948
摘要： An LCD panel will rotate based on an external control signal by a prescribed angle such portion of light flux, that enters an objective lens, corresponding to a predetermined incident point and, at the same time, will change by a prescribed length an optical path of this portion of optical flux whose aberrations are in excess of a prescribed standard value. It is thus possible to compensate the wave-front aberrations due to the differences in the effective optical-path length and also to control the effective numerical aperture of the objective lens by utilizing linearly polarized light as the light to be emitted from the laser beam source. It is also possible to compensate the aberrations due the differences in the substrate thickness of the optical recording medium and those due to a tilt of the optical recording medium.
摘要翻译： LCD面板将根据外部控制信号以预定角度旋转对应于预定入射点的进入物镜的光束部分，并且同时将改变预定长度的光路的光路这部分光通量的像差超过规定的标准值。因此，可以补偿由于有效光路长度的差异引起的波前像差，并且还可以通过利用线偏振光作为从激光束源发射的光来控制物镜的有效数值孔径。也可以补偿光记录介质的基板厚度的差异和由于光记录介质的倾斜导致的像差。

3. 发明授权

US06678232B2 Aberration correcting element and assembly 失效
标题翻译：畸变校正元件和装配
公开(公告)号：US06678232B2
公开(公告)日：2004-01-13
申请号：US10046555
申请日：2002-01-16
申请人： Masakazu Ogasawara , Yoshitsugu Araki
发明人： Masakazu Ogasawara , Yoshitsugu Araki
IPC分类号： G11B700
CPC分类号： G11B7/13925 , G11B7/1369
摘要： An aberration correcting element includes a first electrode layer including a plurality of electrode portions; a second electrode layer opposed to the first electrode layer; and a liquid crystal sandwiched between the first and second electrode layers for producing a phase change corresponding to voltages applied to the first and second electrode layers in a light beam passing therethrough. The first electrode layer includes a plurality of position markers.
摘要翻译：像差校正元件包括：包括多个电极部分的第一电极层; 与第一电极层相对的第二电极层; 以及夹在第一和第二电极层之间的液晶，用于产生对应于通过其中的光束施加到第一和第二电极层的电压的相位变化。第一电极层包括多个位置标记。

4. 发明授权

US07116612B2 Optical pickup device driven by an error signal obtained from an optical detector's output signals 失效
标题翻译：光拾取装置由光检测器的输出信号获得的误差信号驱动
公开(公告)号：US07116612B2
公开(公告)日：2006-10-03
申请号：US10043287
申请日：2002-01-14
申请人： Masakazu Ogasawara , Yoshitsugu Araki
发明人： Masakazu Ogasawara , Yoshitsugu Araki
IPC分类号： G11B7/095
CPC分类号： G11B7/1353 , G11B7/00718 , G11B7/0903 , G11B7/0906 , G11B7/0909 , G11B7/0943 , G11B7/131 , G11B7/1356 , G11B7/1378 , G11B2007/0006
摘要： A light beam from a light source is introduced to a grating element of a pickup device to create zero order diffracted light, ±first order diffracted light, and ±second order diffracted light. An irradiation system focuses the zero order, ±first order and ±second order diffracted light onto tracks extending on a recording surface of an optical recording medium to form spots. A spot of the zero order diffracted light is formed on a target track, spots of the ±second order diffracted light are formed on tracks adjacent to the target track, and spots of the ±first order diffracted light are formed midway between the spots of the ±zero order and ±second order diffracted light. An optical system guides returning light reflected from the spots to an optical detector. The optical detector has independent light-receiving elements for receiving the returning light. A servo signal calculator creates an error signal based on the output signals from the optical detector. The pickup device can be used for various types of optical discs having different disc structures. The pickup device can obtain a tracking error signal by a differential push-pull (DPP) method whatever optical disc is recorded and played back. The optical pickup device can use a crosstalk cancel (CTC) method whatever optical disc is played back.
摘要翻译：来自光源的光束被引入拾取装置的光栅元件，以产生零级衍射光，±一级衍射光和±二阶衍射光。照射系统将零级±一级和±二级衍射光聚焦到在光记录介质的记录表面上延伸的轨道上以形成斑点。在目标轨迹上形成零级衍射光的点，±2级衍射光的点形成在与目标轨道相邻的轨道上，并且±一阶衍射光的点形成在 ±零级和±二级衍射光。光学系统引导将从点反射的光返回到光学检测器。光学检测器具有用于接收返回光的独立的光接收元件。伺服信号计算器基于来自光学检测器的输出信号产生误差信号。拾取装置可以用于具有不同盘结构的各种类型的光盘。拾取装置可以通过差分推挽（DPP）方法获得跟踪误差信号，无论记录和回放光盘。无论使用什么光盘，光拾取装置都可以使用串扰消除（CTC）方法。

5. 发明授权

US06690500B2 Aberration correction apparatus and method 失效
标题翻译：畸变校正装置及方法
公开(公告)号：US06690500B2
公开(公告)日：2004-02-10
申请号：US09885526
申请日：2001-06-21
申请人： Masakazu Ogasawara , Masayuki Iwasaki , Yoshitsugu Araki
发明人： Masakazu Ogasawara , Masayuki Iwasaki , Yoshitsugu Araki
IPC分类号： G02F103
CPC分类号： G11B7/1353 , G02F1/134309 , G02F1/1345 , G02F1/29 , G02F2203/18 , G11B7/0948 , G11B7/1369 , G11B2007/13727
摘要： An aberration correction device for correcting aberration produced in a light beam, which includes: a first electrode layer and a second electrode layer being opposed to each other; and a liquid crystal disposed between the first electrode layer and the second electrode layer for producing a change in phase in a light beam passing therethrough in accordance with voltages applied to the first electrode layer and the second electrode layer. The first electrode layer is divided into a plurality of phase adjustment portions which are electrically isolated each other. Each of the plurality of phase adjustment portions includes a pair of electrodes arranged in such a form that produces an electric field distribution for correcting the aberration by applying predetermined voltages thereto.
摘要翻译：一种用于校正光束产生的像差的像差校正装置，包括：第一电极层和彼此相对的第二电极层; 以及设置在所述第一电极层和所述第二电极层之间的液晶，用于根据施加到所述第一电极层和所述第二电极层的电压，在通过其的光束中产生相位变化。第一电极层被分成彼此电隔离的多个相位调整部。多个相位调整部分中的每一个包括一对电极，这些电极通过向其施加预定电压而产生用于校正像差的电场分布。

6. 发明授权

US06218655B1 Optical pickup 有权
标题翻译：光学拾音
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。

7. 发明授权

US5999503A Focus control apparatus in multi-layered disk reading apparatus utilizing acceleration, deceleration and focus error signals to switch between layers of the disk 失效
标题翻译：多层盘读取装置中的聚焦控制装置，利用加速度，减速度和聚焦误差信号在盘的层之间切换
公开(公告)号：US5999503A
公开(公告)日：1999-12-07
申请号：US698797
申请日：1996-08-16
申请人： Kiyoshi Tateishi , Masakazu Ogasawara
发明人： Kiyoshi Tateishi , Masakazu Ogasawara
IPC分类号： G11B7/00 , G11B7/085 , G11B7/095
CPC分类号： G11B7/08511 , G11B2007/0013
摘要： Focus control apparatus in a reading apparatus for reading a multi-layered disk having information recorded on a plurality of recording surfaces thereof. The focus control apparatus includes a signal generating system for generating an acceleration signal for forcing the objective lens to move in the optical axis direction of the light beam and a deceleration signal for braking the objective lens which has been forced to move. The apparatus further includes control circuit for supplying a lens driving system with the acceleration signal and the deceleration signal as the driving signal in response to a switching instruction for switching a recording surface from which information is to be read, and for supplying the driving system with the focus error signal as the driving signal after the generation of the deceleration signal, to focus the light beam on a target recording surface. The deceleration signal has a parameter which is a function of distance between the recording surface which has been read before the switching instruction is issued and the target recording surface. Preferably, either of the acceleration signal and the deceleration signal is a signal which is compensated for the influence of gravity acting on the objective lens.
摘要翻译：用于读取具有记录在其多个记录表面上的信息的多层盘的读取装置中的聚焦控制装置。该聚焦控制装置包括：信号发生系统，用于产生用于迫使物镜在光束的光轴方向上移动的加速度信号;以及用于制动被迫移动的物镜的减速信号。该装置还包括控制电路，用于响应于用于切换要从其读取信息的记录表面的切换指令，向镜头驱动系统提供加速度信号和减速信号作为驱动信号，并且用于向驱动系统提供聚焦误差信号作为减速信号生成后的驱动信号，将光束聚焦在目标记录面上。减速信号具有作为在切换指令被读出的记录面与目标记录面之间的距离的函数的参数。优选地，加速度信号和减速信号中的任一个是补偿作用在物镜上的重力的影响的信号。

8. 发明授权

US07944797B2 Recording and reproducing method, recording medium, and recording and reproducing apparatus 失效
标题翻译：记录和再现方法，记录介质和记录和再现装置
公开(公告)号：US07944797B2
公开(公告)日：2011-05-17
申请号：US12294455
申请日：2007-03-14
申请人： Masakazu Ogasawara
发明人： Masakazu Ogasawara
IPC分类号： G11B7/00
CPC分类号： G11B7/00781 , G11B7/0065
摘要： A recording method which optically records two-dimensional data including a positioning mark and data area in a recording medium. In this method, the state of the positioning mark is changed from a first state to at least one second state different from the first state every given number of recording times of such two-dimensional data.
摘要翻译：一种记录方法，其将包括定位标记和数据区的二维数据光记录在记录介质中。在该方法中，定位标记的状态从这样的二维数据的每给定数量的记录次数从第一状态改变为与第一状态不同的至少一个第二状态。

9. 发明授权

US07821899B2 Optical pickup device 失效
标题翻译：光学拾取装置
公开(公告)号：US07821899B2
公开(公告)日：2010-10-26
申请号：US11996430
申请日：2006-07-03
申请人： Takuma Yanagisawa , Masakazu Ogasawara
发明人： Takuma Yanagisawa , Masakazu Ogasawara
IPC分类号： G11B7/00
CPC分类号： G11B7/1381 , G11B7/0903 , G11B7/094 , G11B7/1353
摘要： The present invention provides an optical pickup device requiring no position adjustment of a diffraction grating at the time of assembling the optical pickup device, and capable of suppressing fluctuations in a differential push-pull signal amplitude and cancelling a push-pull offset.An optical pickup device 200 of an embodiment of the present invention has a diffraction grating 230 of a special shape including predetermined grooves and two kinds of lattice grooves arranged at a pitch determined on the basis of a pitch of grooves formed in the surface of an optical disk 50, numerical aperture, wavelength of a light beam, and effective diameter of the light beam applied on the optical disk 50. To suppress push-pull signals generated in the ± first-order diffraction rays, reflection rays from the optical disk 50 of a zeroth-order diffraction ray and ± first-order diffraction rays are detected, and signals corresponding to light reception results are output to a reproduction unit 150, a control unit 130, and an actuator servo circuit 140.
摘要翻译：本发明提供了一种在组装光学拾取装置时不需要对衍射光栅进行位置调整并且能够抑制差分推挽信号振幅的波动并取消推挽偏移的光学拾取装置。本发明实施例的光学拾取装置200具有特殊形状的衍射光栅230，该衍射光栅230包括预定的凹槽和两个格栅槽，它们以基于在光学器件表面形成的凹槽的间距所确定的间距盘50，数值孔径，光束波长和施加在光盘50上的光束的有效直径。为了抑制在±一级衍射光线中产生的推挽信号，来自光盘50的反射光线检测到零级衍射线和±一级衍射线，并且将对应于光接收结果的信号输出到再现单元150，控制单元130和致动器伺服电路140。

10. 发明申请

US20100177619A1 PICKUP DEVICE 失效
标题翻译：扒手装置
公开(公告)号：US20100177619A1
公开(公告)日：2010-07-15
申请号：US12376595
申请日：2006-10-04
申请人： Makoto Sato , Masakazu Ogasawara , Takuma Yanagisawa
发明人： Makoto Sato , Masakazu Ogasawara , Takuma Yanagisawa
IPC分类号： G11B7/00
CPC分类号： G11B7/0901 , G11B7/0909 , G11B7/133 , G11B7/1353 , G11B2007/0013
摘要： A pickup device which, focusing a ray bundle on a track of a recording surface of an optical recording medium to form a light spot, comprises a detection optical system including a photo detector to receive return light reflected from the light spot via an objective lens and perform photoelectric conversion. The photo detector has at least two photoreceptor sections positioned axis-symmetrical with respect to a detection-side division line extending through an optical axis of the return light and parallel to the track. A dividing element placed in an optical path between the photo detector and the objective lens includes at least two inner divided areas positioned axis-symmetrical with respect to a deflection-side division line extending through the optical axis of the return light and parallel to the track, and at least two outer divided areas positioned sandwiching the inner divided areas and axis-symmetrical with respect to the deflection-side division line. The inner divided areas are formed such that parts of a light beam from the other region than overlap regions, divided axis-symmetrically along the deflection-side division line, are exchanged in position across the detection-side division line and directed to the photoreceptor sections of the photo detector so as to be axis-symmetrical with respect to the detection-side division line.
摘要翻译：一种拾取装置，其将光束聚焦在光记录介质的记录表面的轨道上以形成光点，包括检测光学系统，其包括光电检测器，以接收经由物镜从光点反射的返回光;以及执行光电转换。光检测器具有至少两个相对于延伸通过返回光的光轴并平行于轨道的检测侧分割线轴对称的感光体部分。放置在光检测器和物镜之间的光路中的分隔元件包括至少两个相对于延伸穿过返回光的光轴并平行于轨道的偏转侧分割线轴对称的内分割区域以及至少两个外分割区域，其定位为夹着内分割区域并相对于偏转侧分割线轴对称。内部分割区域被形成为使得来自另一区域的光束的部分比沿着偏转侧分割线轴对称分割的重叠区域的部分在检测侧分割线上交替位置并且被引导到感光体部分的光检测器相对于检测侧分割线轴对称。

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