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31. 发明授权

US07796491B2 Wavelength plate, optical element, and optical pickup 失效
标题翻译：波长板，光学元件和光学拾取器
公开(公告)号：US07796491B2
公开(公告)日：2010-09-14
申请号：US11237197
申请日：2005-09-28
申请人： Jun-ichi Asada , Seiji Nishiwaki , Kazuo Momoo
发明人： Jun-ichi Asada , Seiji Nishiwaki , Kazuo Momoo
IPC分类号： G11B7/135
CPC分类号： G11B7/1365 , G11B7/1369 , G11B2007/0006
摘要： There is provided, in an optical disk apparatus which is capable of recording data to or reading data from a plurality of types of optical disks, a wavelength plate and an optical pickup which can reduce deterioration in signal quality even in the presence of a large birefringence of the substrate of an optical disk. A wavelength plate 6 according to the present invention is a wavelength plate to be placed in an optical path through which rays of a plurality of wavelengths travel back and forth, the plurality of wavelengths including a ray having a wavelength λ. The wavelength plate includes a two-dimensional array of a plurality of birefringent regions, the birefringent regions including first regions D1 and second regions D2 having different optic axis directions from each other. The relationship 240°≦Δ1≦300° is true, where Δ1 is a retardation of the wavelength plate 6 for the ray of the wavelength λ.
摘要翻译：在能够将数据记录到或从多种类型的光盘读取数据的光盘装置中，提供了即使存在大的双折射也能够降低信号质量劣化的波长板和光学拾取器的光盘的基板。根据本发明的波长板6是放置在多个波长的光线前后移动的光路中的波长板，多个波长包括具有波长λ的射线。波长板包括多个双折射区域的二维阵列，双折射区域包括彼此具有不同光轴方向的第一区域D1和第二区域D2。 240°＆nlE;＆Dgr; 1＆nlE; 300°的关系为真，其中＆Dgr; 1为波长λ的波长的波长板6的延迟。

32. 发明申请

US20100135146A1 OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE 有权
标题翻译：光学拾取装置和光盘装置
公开(公告)号：US20100135146A1
公开(公告)日：2010-06-03
申请号：US12598779
申请日：2008-04-17
申请人： Jun-iti Asada , Seiji Nishiwaki , Kazuo Momoo
发明人： Jun-iti Asada , Seiji Nishiwaki , Kazuo Momoo
IPC分类号： G11B7/135
CPC分类号： G11B7/094 , G11B7/1275 , G11B7/131 , G11B7/1353 , G11B7/1381 , G11B2007/0006 , G11B2007/13727
摘要： When first-order diffracted beams leak into a region, which is for receiving only a zeroth-order diffracted beam from an optical disc, due to positional displacement between an objective lens and a hologram element, an offset compensation signal includes an AC component, the offset compensation signal preferably including a DC component only. Accordingly, there may be caused deterioration in a modulation degree of the tracking error (TE) signal. A partial light shielding element 110 is formed on a hologram surface 112a along boundaries between a light receiving region (121a), which receives a zeroth-order diffracted beam, and light receiving regions (121b, 121c), which receive the zeroth-order diffracted beam and first-order diffracted beams, so as to cover the light receiving region (121a). Further, the partial light shielding element 110 shifts phases of transmitted light beams by π, whereby the TE signal is offset-compensated, and the modulation degree can be improved.
摘要翻译：当一级衍射光束由于物镜和全息元件之间的位置偏移而泄漏到仅用于从光盘接收零级衍射光束的区域中时，偏移补偿信号包括AC分量，偏移补偿信号优选地仅包括DC分量。因此，可能导致跟踪误差（TE）信号的调制度的劣化。部分遮光元件110沿着接收零级衍射光束的光接收区域（121a）和接收零级衍射光的受光区域（121b，121c）之间的边界形成在全息图表面112a上光束和一级衍射光束，以覆盖光接收区域（121a）。此外，部分遮光元件110将透射光束的相位移位＆pgr，由此TE信号被偏移补偿，并且可以提高调制度。

33. 发明申请

US20090279403A1 OPTICAL DISC DEVICE 失效
标题翻译：光盘设备
公开(公告)号：US20090279403A1
公开(公告)日：2009-11-12
申请号：US12296822
申请日：2007-03-19
申请人： Seiji Nishiwaki , Kazuo Momoo , Junichi Asada
发明人： Seiji Nishiwaki , Kazuo Momoo , Junichi Asada
IPC分类号： G11B7/00 , G11B7/135
CPC分类号： G11B7/0903 , G11B7/094 , G11B7/131 , G11B7/1353
摘要： Light emitted from a radiation light source 1 passes through a diffraction grating 3a and is separated into transmitted light a, +1st order diffracted light b, and −1st order diffracted light c. The transmitted light a, +1st order diffracted light b, and −1st order diffracted light c are collected through an objective lens 7 on tracks on the signal plane 8a of an optical disc 8 in a partially overlapped state. Light reflected by the tracks on the signal plane 8a passes through the objective lens 7 and is incident upon light diverging means 13a. Subsequently, depending on the location of incidence, light corresponding to the transmitted light “a” diverges into two light beams that are respectively incident upon light detection regions A1, A2, light corresponding to the +1st order diffracted light “b” diverges into two light beams that are respectively incident upon light detection regions B1, B2, and light corresponding to the −1st order diffracted light “c” diverges into two light beams that are respectively incident upon light detection regions C1, C2. A tracking error signal associated with the tracks of the optical disc 8 is generated by combining signals detected in the light detection regions A1, A2, B1, B2, C1, and C2. Based on the above-described configuration, the influence of lens shift-induced off-track can be cancelled without impairing the detected tracking error signal output even without rotational adjustment of the rectilinear gratings.
摘要翻译：从辐射光源1发射的光通过衍射光栅3a并分离为透射光a + 1级衍射光b和-1级衍射光c。透射光a，+ 1级衍射光b和-1级衍射光c以部分重叠的状态通过物镜7在光盘8的信号平面8a上的轨道上被收集。由信号平面8a上的轨道反射的光通过物镜7并入射到光发散装置13a上。随后，根据入射位置，对应于透射光“a”的光分散到分别入射到光检测区域A1，A2的两个光束中，对应于+ 1级衍射光“b”的光分叉成两个分别入射到光检测区域B1，B2和对应于-1级衍射光“c”的光的光束分叉成分别入射到光检测区域C1，C2的两个光束。通过组合在光检测区域A1，A2，B1，B2，C1和C2中检测到的信号来产生与光盘8的轨道相关联的跟踪误差信号。基于上述配置，即使没有直线光栅的旋转调节，也可以消除透镜偏移诱导偏离磁道的影响，而不损害检测到的跟踪误差信号输出。

34. 发明授权

US07505389B2 Information processing device and information recording medium 失效
标题翻译：信息处理装置和信息记录介质
公开(公告)号：US07505389B2
公开(公告)日：2009-03-17
申请号：US11100028
申请日：2005-04-06
申请人： Seiji Nishiwaki , Kazuo Momoo
发明人： Seiji Nishiwaki , Kazuo Momoo
IPC分类号： G11B7/00
CPC分类号： G11B7/0065 , G03H2001/0415 , G03H2250/42 , G11B7/128
摘要： There is provided an information processing device which is capable of suppressing generation of stray light at the time of recording and reproduction of information, thus enabling quality information recording and reproduction. The information processing device includes: a radiation light source 2; and a converging section for converging rays emitted from the light source toward an information recording medium having a photosensitive layer 11b, wherein the converging section splits the rays into first and second rays 3′ and 3 respectively traveling through first and second spaces as divided by a plane at least containing a point optical axis L, and converges the first and second rays 3′ and 3 onto first and second points 12′ and 12 in the information recording medium 11, the photosensitive layer 11b being interposed between the first and second points 12′ and 12. Between the first and second points 12′ and 12, the first and second rays 3′ and 3 interfere with each other to form interference fringes, the interference fringes representing information to be recorded in the photosensitive layer 11b of the information recording medium 11.
摘要翻译：提供了一种信息处理装置，其能够抑制在记录和再现信息时的杂散光的产生，从而实现质量信息的记录和再现。信息处理装置包括：辐射光源2; 以及会聚部分，用于将从光源发射的光线朝向具有感光层11b的信息记录介质会聚，其中会聚部分将光线分裂成分别穿过第一和第二空间的第一和第二光线3'和3，平面，至少包含点光轴L，并且将第一和第二光线3'和3会聚到信息记录介质11中的第一和第二点12'和12上，感光层11b介于第一和第二点12之间在第一和第二点12'和12之间，第一和第二射线3'和3彼此干涉以形成干涉条纹，干涉条纹表示要记录在信息记录的感光层11b中的信息中等11。

35. 发明申请

US20090028036A1 OPTICAL DISC DEVICE 审中-公开
标题翻译：光盘设备
公开(公告)号：US20090028036A1
公开(公告)日：2009-01-29
申请号：US12282598
申请日：2007-03-13
申请人： Seiji Nishiwaki , Kazuo Momoo , Junichi Asada
发明人： Seiji Nishiwaki , Kazuo Momoo , Junichi Asada
IPC分类号： G11B7/135
CPC分类号： G11B7/0901 , G11B7/131 , G11B7/1353 , G11B2007/0013
摘要： The invention permits stable tracking with few control errors, uninfluenced by stray light reflected by signal surfaces other than the signal surface being used for focusing during recording and playback of a multilayer disc. To this end, the optical splitter element of the optical disc device according to the present invention has first areas (21c-24c), which include the location (20) of the optical axis of light incident from the objective lens, and, around the periphery of the first areas, second areas (21a-24a, 21b-24b) positioned at locations displaced from the optical axis. The detection surface (9a) of the photodetector has first detection areas (97, 98) detecting light incident from the first areas and second detection areas (95, 96) detecting light incident from the second areas. The second detection areas are used for detecting tracking error signals. If the optical disc has multiple signal surfaces, light that is reflected by signal surfaces other than the signal surface being used for focusing and is incident on the photodetector from the first areas is not incident on the second detection areas.
摘要翻译：本发明允许具有很少控制误差的稳定跟踪，不受在多层盘的记录和重放期间用于聚焦的信号表面以外的信号表面反射的杂散光的影响。为此，根据本发明的光盘装置的光分路器元件具有第一区域（21c-24c），其包括从物镜入射的光的光轴的位置（20），并且围绕第一区域的周边，位于偏离光轴的位置的第二区域（21a-24a，21b-24b）。光检测器的检测表面（9a）具有检测从第一区域入射的光的第一检测区域（97,98）和检测从第二区域入射的光的第二检测区域（95,96）。第二检测区域用于检测跟踪误差信号。如果光盘具有多个信号表面，则由信号表面以外的信号表面反射的光被用于聚焦并且从第一区域入射到光电检测器上的光不会入射到第二检测区域。

36. 发明申请

US20090009886A1 OPTICAL PICKUP AND OPTICAL DISK DEVICE HAVING THIS PICKUP 有权
标题翻译：具有此PICKUP的光学拾取和光盘设备
公开(公告)号：US20090009886A1
公开(公告)日：2009-01-08
申请号：US11813900
申请日：2006-01-19
申请人： Seiji Nishiwaki , Kazuo Momoo
发明人： Seiji Nishiwaki , Kazuo Momoo
IPC分类号： G02B13/18
CPC分类号： G11B7/1353 , G11B7/123 , G11B7/1275 , G11B7/1367 , G11B7/1374 , G11B7/13922 , G11B2007/0006
摘要： An optical pickup according to the present invention includes a plurality of light sources for emitting a plurality of light beams including first and second light beams of respectively different wavelengths, an objective lens for converging the plurality of light beams, and a grating structure shaped axisymmetrically with respect to the optical axis of the objective lens. Pth-order diffracted light (where p is a non-zero integer) which is formed from the first light beam (e.g. blue) by the grating structure is converged on an information layer of an optical disk (e.g. a BD) corresponding to the first light beam, owing to the converging actions of the objective lens and grating structure. Moreover, qth-order diffracted light (where q is a non-zero integer such that q≠p) which is formed from the second light beam (e.g. red or infrared) by the grating structure is converged on an information layer of an optical disk (e.g. a DVD or CD) corresponding to the second light beam, owing to the converging actions of the objective lens and the grating structure. Thus, by appropriately using diffracted light of different orders, it becomes possible to perform convergence on optical disks of different wavelengths and base thicknesses, with reduced spherical aberration.
摘要翻译：根据本发明的光学拾取器包括多个光源，用于发射包括分别不同波长的第一和第二光束的多个光束，用于会聚多个光束的物镜，以及用于对准具有相对于物镜的光轴。由光栅结构由第一光束（例如蓝色）形成的P级衍射光（其中p为非零整数）会聚在与第一光束对应的光盘（例如BD）的信息层上光束，由于物镜和光栅结构的会聚作用。此外，由光栅结构的第二光束（例如红色或红外）形成的q级衍射光（其中q是非零整数，使得q

37. 发明授权

US07196991B2 Optical disk apparatus, method for calculation of amount of lens shift, program and medium 失效
标题翻译：光盘装置，透镜偏移量的计算方法，程序和介质
公开(公告)号：US07196991B2
公开(公告)日：2007-03-27
申请号：US09994335
申请日：2001-11-26
申请人： Junji Nagaoka , Seiji Nishiwaki , Kazuo Momoo
发明人： Junji Nagaoka , Seiji Nishiwaki , Kazuo Momoo
IPC分类号： G11B7/00
CPC分类号： G11B7/0901 , G11B7/0956
摘要： An optical disk apparatus has an optical head having a lens of converging light from a light source onto an optical disk and a photodetector for detecting the light thus converged and then reflected from the optical disk. A tracking error signal is generated in order to perform tracking control on the basis of the detected light. A disk tilt DT is detected to indicate the amount of tilt of the optical head relative to the optical disk. A calculation is performed to calculate a lens shift LS indicating the amount of shift of the lens relative to the optical head, according to a predetermined rule on the basis of the generated tracking error signal and the detected disk tilt DT.
摘要翻译：光盘装置具有光头，该光头具有将来自光源的光会聚到光盘上的透镜，以及用于检测由此会聚的光然后从光盘反射的光检测器。产生跟踪误差信号，以便根据检测到的光进行跟踪控制。检测到盘倾斜DT以指示光学头相对于光盘的倾斜量。根据产生的跟踪误差信号和检测到的盘倾斜DT，根据预定规则，进行计算，以计算指示透镜相对于光学头的偏移量的透镜偏移LS。

38. 发明授权

US07142489B2 Optical disk device with photodetector 有权
标题翻译：带光电检测器的光盘设备
公开(公告)号：US07142489B2
公开(公告)日：2006-11-28
申请号：US10530585
申请日：2003-10-16
申请人： Seiji Nishiwaki , Kazuo Momoo , Youichi Saitoh
发明人： Seiji Nishiwaki , Kazuo Momoo , Youichi Saitoh
IPC分类号： G11B7/00
CPC分类号： G11B7/133 , G11B7/0943 , G11B7/131 , G11B7/1353 , G11B2007/0013
摘要： An optical disk device is provided that can realize favorable recording/reproduction of signals on/from an optical disk having a plurality of signal planes arranged in proximity to each other. In this optical disk device, a hologram (4) is divided into n(n≧2) regions Ak(k=1, 2, . . . , n) by a straight line that intersects with an optical axis, and a photodetector (7) is divided into at least two regions A and A′. Light emitted from a light source (1) is focused on a signal plane (6a) or (6b) included in a plurality of signal planes of the optical disk by an objective lens (5). Light reflected from a first signal plane (6a) and light reflected from a second signal plane (6b) pass through the objective lens (5) to turn into light beams a and a′, respectively, that enter the hologram (4). 1st-order diffracted light beams ak and ak′ having a common diffraction optical axis are derived from the light beams a and a′ that have entered the regions Ak of the hologram (4), respectively, and are projected on the photodetector (7). Distributions of the 1st-order diffracted light beams ak and ak′ on the photodetector (7) are approximately inverted with respect to an intersection point of the diffraction optical axis and a detection plane. The 1st-order diffracted light beam ak is approximately within the region A and the 1st-order diffracted light beam ak′ is approximately within the region A′.
摘要翻译：提供了一种光盘装置，其可以实现具有彼此靠近布置的多个信号面的光盘的信号的良好记录/再现。在该光盘装置中，通过与光轴相交的直线将全息图（4）分割成n（n> = 2）个区域Ak（k = 1,2，...，n），以及光检测器（7）被分成至少两个区域A和A'。从光源（1）发射的光通过物镜（5）聚焦在包括在光盘的多个信号平面中的信号平面（6a）或（6b）上。从第一信号面（6a）反射的光和从第二信号面（6b）反射的光分别通过物镜（5）转变成进入全息图（4）的光束a和a' 。分别从已经进入全息图（4）的区域Ak的光束a和a'导出具有共同的衍射光轴的1级衍射光束ak和ak'并投影在光电检测器（7）上，。在光检测器（7）上的1级衍射光束ak和ak'的分布相对于衍射光轴和检测平面的交点近似倒置。 1级衍射光束ak大致在区域A内，1级衍射光束ak'大致在区域A'内。

39. 发明申请

US20060181996A1 Optical pickup device and optical disk device 有权
标题翻译：光拾取装置和光盘装置
公开(公告)号：US20060181996A1
公开(公告)日：2006-08-17
申请号：US10552193
申请日：2004-04-06
申请人： Hiroaki Matsumiya , Seiji Nishiwaki , Kazuo Momoo
发明人： Hiroaki Matsumiya , Seiji Nishiwaki , Kazuo Momoo
IPC分类号： G11B7/00
CPC分类号： G11B7/0903 , G11B7/094 , G11B7/0943
摘要： An optical disk apparatus according to the present invention includes: a motor for rotating an optical disk; a light source; diffraction means for diffracting a portion of light emitted from the light source to form a main beam of 0th order light and a pair of sub beams composed of +1st order light and −1st order light which are formed on both sides of the 0th order light; an objective lens for converging the main beam and the pair of sub beams onto the optical disk; a light receiving means for receiving the main beam and the sub beams reflected from the optical disk, and outputting electrical signals through photoelectric conversion; and a calculation section for, based on the electrical signals output from the light receiving means, providing a main push-pull signal MPP, a sub push-pull signal SPP, and a differential signal between the main push-pull signal MPP and the sub push-pull signal SPP. A phase difference detection means for detecting a phase difference between the main push-pull signal MPP and the differential signal is further included, and in accordance with an output from the phase difference detection means, an offset is applied in a tracking control of the main beam with respect to the optical disk to compensate for an off-tracking caused by a phase shift of the differential signal.
摘要翻译：根据本发明的光盘装置包括：用于旋转光盘的电动机; 光源; 衍射装置，用于衍射从光源发射的光的一部分以形成第0级次级光的主光束和由+1级次级光组成的一对子光束和第<！ - SIPO - >次级光，其形成在第0级次光的两侧; 用于将所述主光束和所述一对子光束会聚到所述光盘上的物镜; 光接收装置，用于接收从光盘反射的主光束和子光束，并通过光电转换输出电信号; 以及计算部分，用于基于从光接收装置输出的电信号，提供主推挽信号MPP，副推挽信号SPP和主推挽信号MPP与子信号之间的差分信号推挽信号SPP。还包括用于检测主推挽信号MPP和差分信号之间的相位差的相位差检测装置，并且根据相位差检测装置的输出，在主要的跟踪控制中应用偏移相对于光盘的光束来补偿由差分信号的相移导致的偏离跟踪。

40. 发明授权

US06930972B2 Optical information processor and optical element 有权
公开(公告)号：US06930972B2
公开(公告)日：2005-08-16
申请号：US10617084
申请日：2003-07-10
申请人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
发明人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
IPC分类号： G11B7/09 , G11B7/135 , G11B7/00
CPC分类号： G11B7/139 , G11B7/1353
摘要： An optical disk device has an aperture of an objective lens in an incoming path of a beam from a semiconductor laser to an optical disk formed larger than an aperture in a return path from the optical disk or an aperture is varied in recording and in reproduction. This configuration improves recording/reproducing ability since light is focused on an optical disk with high numerical aperture. In addition, since reflected light from the optical disk is detected with low numerical aperture, margins for tilt and defocus are not reduced. Furthermore, since unnecessary signal components contained in the reflected light can be eliminated, a S/N (signal-to-noise ratio) of an information signal also increases. Thus, a high-performance optical disk device can be obtained. Alternatively, by varying the aperture of an objective lens in recording and in reproduction, an optical disk device in which recording density and recording quality are increased without deteriorating reproduction quality can be obtained.

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