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1. 发明授权

US06801491B1 Focus error detecting apparatus of optical pickup with a light separating and astigmatism generation optical element and detection method thereof 失效
标题翻译：具有光分离和像散生成光学元件的光学拾取器的聚焦误差检测装置及其检测方法
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。

2. 发明授权

US08238220B2 Pickup device 失效
标题翻译：拾取装置
公开(公告)号：US08238220B2
公开(公告)日：2012-08-07
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 , G11B7/135
CPC分类号： G11B7/0901 , G11B7/0909 , G11B7/133 , G11B7/1353 , G11B2007/0013
摘要： A pickup device comprising an irradiation optical system including an objective lens to focus a ray bundle on a track of a recording surface of an optical recording medium to form a light spot, and a detection optical system including a photo detector to receive return light reflected from the light spot via the objective lens and perform photoelectric conversion and controls said objective lens in position according to electrical signals produced through operations on outputs of said photo detector.
摘要翻译：一种拾取装置，包括：包括物镜的照射光学系统，用于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;以及检测光学系统，包括光电检测器，用于接收从通过物镜进行光点并执行光电转换，并且根据通过对所述光电检测器的输出进行的操作产生的电信号将所述物镜控制在适当位置。

3. 发明申请

US20090310469A1 OPTICAL PICKUP APPARATUS 失效
公开(公告)号：US20090310469A1
公开(公告)日：2009-12-17
申请号：US12521959
申请日：2007-01-05
申请人： Takuma Yanagisawa , Masakazu Ogasawara , Makoto Sato
发明人： Takuma Yanagisawa , Masakazu Ogasawara , Makoto Sato
IPC分类号： G11B7/135
CPC分类号： G11B7/133 , G11B7/0903 , G11B7/094 , G11B7/131
摘要： An optical pickup apparatus reads an information signal recorded on a recording surface of an optical disk along a track by projecting a light beam. Said optical pickup apparatus has: an objective lens for converging said light beam onto said recording surface; an objective lens moving device for moving said objective lens in a radial direction of said optical disk; and a divisional photosensing device for receiving return light reflected by said optical disk, in a plurality of divided regions. Said divisional photosensing device has: a first divisional photosensing device for dividing a first region including both edge portions in said radial direction of said return light, in two divided areas in said radial direction; a second divisional photosensing device for receiving a second region including both edge portions in a direction which perpendicularly crosses said radial direction of said return light, in two divided areas in said radial direction; and a third divisional photosensing device for receiving a third region including an almost center portion of said return light, in two divided areas in said radial direction.
摘要翻译：光拾取装置通过投影光束沿着轨道读取记录在光盘的记录表面上的信息信号。所述光学拾取装置具有：用于将所述光束会聚到所述记录表面上的物镜; 用于在所述光盘的径向上移动所述物镜的物镜移动装置; 以及分割光敏装置，用于在多个分割区域中接收由所述光盘反射的返回光。所述分光感测装置具有：第一分光感测装置，用于在所述径向方向上的两个分割区域中分割包括所述返回光的所述径向方向上的两个边缘部分的第一区域; 第二分光光感测装置，用于在所述径向方向的两个分割区域中接收包括垂直于所述返回光的所述径向方向的两个边缘部分的第二区域; 以及第三分光感测装置，用于在所述径向方向上的两个分割区域中接收包括所述返回光的几乎中心部分的第三区域。

4. 发明授权

US6124988A Objective lens 失效
标题翻译：物镜
公开(公告)号：US6124988A
公开(公告)日：2000-09-26
申请号：US96536
申请日：1998-06-12
申请人： Takuma Yanagisawa , Katsuhiro Koike , Masakazu Ogasawara
发明人： Takuma Yanagisawa , Katsuhiro Koike , Masakazu Ogasawara
IPC分类号： G02B13/00 , G11B7/00 , G11B7/125 , G11B7/135 , G02B13/18 , G02B3/10
CPC分类号： G11B7/1374 , G11B7/1367 , G11B7/13922 , G11B2007/0006
摘要： An objective lens that allows spherical aberration to be suppressed during the reproduction of a CD without sacrificing reproduction characteristics of a DVD, has a first numerical aperture comprising a refracting surface that is in rotatory symmetry about an optical axis. A part of the refracting surface is displaced along the optical axis as an annular concave (or convex) portion centered on the optical axis. The annular concave (or convex) portion has a certain inner diameter r.sub.1 and a certain outer diameter r.sub.2 that reduce RMS aberration V to a value close to a minimum value. The annular portion has a certain depth (or height).
摘要翻译：在CD的再现期间允许球面像差被抑制的物镜，而不牺牲DVD的再现特性，具有第一数值孔径，其包括围绕光轴旋转对称的折射表面。折射表面的一部分作为中心在光轴上的环形凹（或凸）部分沿着光轴移位。环形凹（或凸）部分具有一定的内径r1和一定的外径r2，其将RMS像差V降低到接近最小值的值。环形部分具有一定的深度（或高度）。

5. 发明授权

US07969836B2 Optical pickup apparatus 失效
标题翻译：光拾取装置
公开(公告)号：US07969836B2
公开(公告)日：2011-06-28
申请号：US12521959
申请日：2007-01-05
申请人： Takuma Yanagisawa , Masakazu Ogasawara , Makoto Sato
发明人： Takuma Yanagisawa , Masakazu Ogasawara , Makoto Sato
IPC分类号： G11B7/00
CPC分类号： G11B7/133 , G11B7/0903 , G11B7/094 , G11B7/131
摘要： An optical pickup apparatus reads an information signal recorded on a recording surface of an optical disk along a track by projecting a light beam. Said optical pickup apparatus has: an objective lens for converging said light beam onto said recording surface; an objective lens moving device for moving said objective lens in a radial direction of said optical disk; and a divisional photosensing device for receiving return light reflected by said optical disk, in a plurality of divided regions. Said divisional photosensing device has: a first divisional photosensing device for dividing a first region including both edge portions in said radial direction of said return light, in two divided areas in said radial direction; a second divisional photosensing device for receiving a second region including both edge portions in a direction which perpendicularly crosses said radial direction of said return light, in two divided areas in said radial direction; and a third divisional photosensing device for receiving a third region including an almost center portion of said return light, in two divided areas in said radial direction.
摘要翻译：光拾取装置通过投影光束沿着轨道读取记录在光盘的记录表面上的信息信号。所述光学拾取装置具有：用于将所述光束会聚到所述记录表面上的物镜; 用于在所述光盘的径向上移动所述物镜的物镜移动装置; 以及分割光敏装置，用于在多个分割区域中接收由所述光盘反射的返回光。所述分光感测装置具有：第一分光感测装置，用于在所述径向方向上的两个分割区域中分割包括所述返回光的所述径向方向上的两个边缘部分的第一区域; 第二分光光感测装置，用于在所述径向方向的两个分割区域中接收包括垂直于所述返回光的所述径向方向的两个边缘部分的第二区域; 以及第三分光感测装置，用于在所述径向方向上的两个分割区域中接收包括所述返回光的几乎中心部分的第三区域。

6. 发明申请

US20100220576A1 OPTICAL PICKUP DEVICE AND INFORMATION RECORDING/REPRODUCTION DEVICE 审中-公开
标题翻译：光学拾取装置和信息记录/再现装置
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。

7. 发明申请

US20090278029A1 PICKUP DEVICE 审中-公开
标题翻译：扒手装置
公开(公告)号：US20090278029A1
公开(公告)日：2009-11-12
申请号：US12441839
申请日：2006-11-01
申请人： Masakazu Ogasawara , Takuma Yanagisawa , Makoto Sato
发明人： Masakazu Ogasawara , Takuma Yanagisawa , Makoto Sato
IPC分类号： G02B27/40 , G02B27/64
CPC分类号： G11B7/094 , G11B7/131 , G11B7/133 , G11B7/1353 , G11B7/1395 , G11B2007/0013
摘要： A pickup device includes an irradiation optical system containing an objective lens for forming a spot by converging a light beam onto a track of a recording surface of an optical recording medium having a plurality of laminated recording layers; and a detection optical system containing a photodetector for receiving, through the objective lens, return light which was reflected and returned from the spot to perform a photoelectric conversion, in which a position of the objective lens is controlled in response to an electric signal arithmetically operated from an output of the photodetector. The photodetector includes a plurality of photosensing element groups which are arranged away from each other on a plane to which an optical axis of the return light penetrates perpendicularly and each of the groups is composed of a plurality of photosensing elements. The pickup device further comprises a dividing element disposed on another plane to which the optical axis of the return light penetrates perpendicularly. The dividing element has: at least two division regions which are formed so as to be line-symmetrical with respect to a track directional line which intersects with the optical axis of the return light and extends in parallel with the track; at least two division regions which are formed so as to be line-symmetrical with respect to a track vertical line which intersects with the optical axis of the return light and extends in the direction perpendicular to the track; and a center division region which includes the optical axis of the return light and is formed so as to be point-symmetrical with respect to the optical axis of the return light. The dividing element divides the return light into a plurality of partial light beams at respective division regions to deflecting the partial light beams from the division regions other than the center division region to the photosensing element groups.
摘要翻译：拾取装置包括照射光学系统，其包含用于通过将光束会聚到具有多个层压记录层的光学记录介质的记录表面的轨道上而形成点的物镜; 以及检测光学系统，其包含光检测器，用于通过物镜接收从点反射和返回的返回光，以进行光电转换，其中物镜的位置响应于电信号被算术运算从光电检测器的输出。光电检测器包括多个光敏元件组，它们在返回光的光轴垂直穿过的平面上彼此远离布置，并且每个组由多个感光元件组成。拾取装置还包括设置在返回光的光轴垂直穿过的另一平面上的分隔元件。分割元件具有至少两个划分区域，其形成为相对于与返回光的光轴相交并且与轨道平行延伸的轨道方向线线对称; 至少两个划分区域，其形成为相对于与返回光的光轴相交的轨道垂直线线性对称，并且在垂直于轨道的方向上延伸; 以及包括返回光的光轴并形成为相对于返回光的光轴点对称的中心分割区域。分割元件将返回光分成各个分割区域的多个局部光束，以将来自除了中心分割区域之外的分割区域的部分光束偏转到光敏元件组。

8. 发明申请

US20090201787A1 PICKUP DEVICE 失效
标题翻译：扒手装置
公开(公告)号：US20090201787A1
公开(公告)日：2009-08-13
申请号：US12307853
申请日：2007-07-13
申请人： Masakazu Ogasawara , Takuma Yanagisawa , Katsuhiro Koike
发明人： Masakazu Ogasawara , Takuma Yanagisawa , Katsuhiro Koike
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/0909 , G11B7/131 , G11B7/133 , G11B7/1378 , G11B2007/0013
摘要： A pickup device includes an irradiation optical system including an object lens for focusing light flux on a track of a recording surface of an optical recording media having a plurality of recording layers stacked while a spacer layer is interposed between the recording layers to form a spot and a detection optical system including an photo detector having a plurality of light receiving parts for receiving returning light reflected from the spot through the object lens to perform photoelectric conversion. The pickup device controls a position of the object leans according to an electrical signal calculated from outputs of the light receiving parts. The pickup device further includes an astigmatic device for providing astigmatism to the returning light directed to the light receiving parts and a division device, having divisional regions divided by a division line extending in an astigmatic direction about an optical axis of the returning light, for dividing the returning light having the astigmatism into a plurality of partial light fluxes divided for the respective divisional regions along the optical axis of returning light. The neighboring divisional regions provide the partial light fluxes with an optical action so that interference between the corresponding partial light fluxes does not occur on the light receiving parts.
摘要翻译：拾取装置包括：照射光学系统，包括用于将光束聚焦在具有堆叠的多个记录层的光学记录介质的记录表面的轨道上的物镜，同时隔离层插入在记录层之间以形成点，一种检测光学系统，包括具有多个光接收部分的光检测器，用于接收通过物镜从该点反射的返回光，以执行光电转换。拾取装置根据从光接收部分的输出计算的电信号来控制物体倾斜的位置。拾取装置还包括用于向指向光接收部分的返回光提供像散的像散装置和分割装置，该分割装置具有被围绕返回光的光轴沿像散方向延伸的分割线划分的分割区域，用于分割将具有像散的返回光分离成沿着返回光的光轴分割成各分区的多个部分光束。相邻分割区域提供具有光学作用的部分光束，使得在光接收部分上不发生对应的部分光束之间的干涉。

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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