公开(公告)号：US06418095B1

公开(公告)日：2002-07-09

申请号：US08877363

申请日：1997-06-17

申请人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

发明人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

IPC分类号： G11B700

CPC分类号： G11B7/1381 ,  G11B7/0943 ,  G11B7/0953 ,  G11B7/0956 ,  G11B7/131

摘要： An optical head device includes a light source for emitting at least one of a coherent beam and a quasi-monochromatic beam; a collection optical system for collecting the beam to an information memory medium having a track which has at least one mark and at least one space; a light detector having a plurality of detection areas for receiving the beam reflected by the information memory medium and outputting a signal in accordance with a light amount of the beam received; and a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals. The tracking error signal generator reduces a difference between a first signal amplitude and a second signal amplitude. The first signal amplitude is an absolute value of a difference between first and second signal levels. The second signal amplitude is an absolute value of a difference between the first and third signal levels. The first signal level is a value of the tracking error signal obtained when the beam emitted by the light source is radiated to a center of the track. The second and third signal levels are, respectively, a maximum value and a minimum value of the tracking error signal obtained when the information memory medium is scanned by the beam emitted by the light source in a direction perpendicular to the track.

公开(公告)号：US5892741A

公开(公告)日：1999-04-06

申请号：US676540

申请日：1996-07-09

申请人： Shin-ichi Kadowaki ,  Shinichi Tanaka ,  Seiji Nishiwaki ,  Kousei Sano ,  Seiji Nishino

发明人： Shin-ichi Kadowaki ,  Shinichi Tanaka ,  Seiji Nishiwaki ,  Kousei Sano ,  Seiji Nishino

IPC分类号： G11B5/016 ,  G11B5/55 ,  G11B5/596 ,  G11B7/09 ,  G11B7/00

CPC分类号： G11B5/59627 ,  G11B5/5556 ,  G11B5/59677 ,  G11B5/016 ,  G11B5/5565 ,  G11B7/0903 ,  G11B7/0941

摘要： In a magnetic recording medium to detect tracking error signals optically where an optical head and a magnetic head scan different tracks, two signals having phases different by .pi./2 are generated and added or subtracted. By changing the amplitude of the two signals with a changeable gain amplifying means, a phase of a tracking error signal is changed so that the servo operation is conducted at the middle of the amplitude of the tracking error signal to keep the magnetic head on track.

摘要翻译： 在用于检测光头和磁头扫描不同轨迹的光学跟踪误差信号的磁记录介质中，产生具有不同于π/ 2的相位的两个信号，并相加或相减。 通过用可变增益放大装置改变两个信号的振幅，改变跟踪误差信号的相位，使得伺服操作在跟踪误差信号的幅度的中间进行，以保持磁头跟踪。

公开(公告)号：US08780683B2

公开(公告)日：2014-07-15

申请号：US14007176

申请日：2012-04-09

申请人： Kousei Sano ,  Tatsuya Takaoka ,  Hidenori Wada ,  Keiichi Matsuzaki

发明人： Kousei Sano ,  Tatsuya Takaoka ,  Hidenori Wada ,  Keiichi Matsuzaki

IPC分类号： G11B7/00

CPC分类号： G11B7/007 ,  B82Y10/00 ,  B82Y20/00 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/24085

摘要： An optical disc (120) has a first mark (131) disposed at the center of a track, a second mark (132) disposed away from the center of the track in a tracking direction thereof by a distance b1, and disposed away from the first mark (131) in the direction along the track by a distance L, and a third mark (133) disposed away from the center of the track in the tracking direction opposite to that of the second mark (132) by a distance b2, and disposed away from the first mark (131) in the direction along the track by a distance L2. The second and third marks (132) and (133) generate scattered light depending on the distance between a scattering medium (103) and each of the marks by irradiating the scattering medium (103) in an optical information apparatus with light. The distances b1 and b2 are smaller than 50 nm.

摘要翻译： 光盘（120）具有设置在轨道中心的第一标记（131），沿跟踪方向远离轨道中心远离距离b1设置的第二标记（132），远离 沿着轨道的方向上的第一标记（131）距离L;以及第三标记（133），沿着与第二标记（132）的跟踪方向相反的跟踪方向远离轨道的中心距离为b2， 并且沿着轨道的方向远离第一标记（131）远离距离L2。 第二和第三标记（132）和（133）通过在具有光的光学信息装置中照射散射介质（103），根据散射介质（103）和每个标记之间的距离产生散射光。 距离b1和b2小于50nm。

公开(公告)号：US20130152110A1

公开(公告)日：2013-06-13

申请号：US13817020

申请日：2012-06-15

申请人： Hideki Nakata ,  Kousei Sano

发明人： Hideki Nakata ,  Kousei Sano

IPC分类号： G11B33/14

CPC分类号： G11B33/146 ,  G11B7/1387 ,  G11B7/24097 ,  G11B23/0316 ,  G11B25/04 ,  G11B25/043 ,  G11B33/1446

摘要： The present application discloses an optical drive system, including: a cartridge with a wall portion which defines a storage room to store a rotatable record medium with a light receiving surface scanned by light; and a drive device with a rotary driver, which rotates the record medium, an optical element, which irradiates the light, and a movement driver, which moves the optical element between inner and outer positions. The wall portion is provided with an outlet at the outer position. Air in the storage room is exhausted from the outlet by air flow resulting from rotation of the record medium. The outlet is divided into first and second opening regions by a movement track of the optical element. The first opening region is larger than the second opening region at an upstream position of the first opening region in a rotational direction of the record medium.

摘要翻译： 本申请公开了一种光驱系统，包括：具有壁部分的盒，其限定存储室以存储具有由光扫描的光接收表面的可旋转记录介质的壁部; 以及具有旋转驱动器的驱动装置，其使记录介质旋转，照射光的光学元件和使光学元件在内部位置和外部位置之间移动的移动驱动器。 壁部在外部位置设有出口。 存储室中的空气由于记录介质旋转引起的空气流从出口排出。 出口通过光学元件的运动轨道分成第一和第二开口区域。 第一开口区域大于在记录介质的旋转方向上的第一开口区域的上游位置处的第二开口区域。

公开(公告)号：US08391120B2

公开(公告)日：2013-03-05

申请号：US12604758

申请日：2009-10-23

申请人： Fumitomo Yamasaki ,  Kousei Sano ,  Tomoaki Tojo ,  Katsuhiko Hayashi ,  Yoshiaki Komma

发明人： Fumitomo Yamasaki ,  Kousei Sano ,  Tomoaki Tojo ,  Katsuhiko Hayashi ,  Yoshiaki Komma

IPC分类号： G11B7/135

CPC分类号： G11B7/1275 ,  G11B7/1374 ,  G11B7/13922 ,  G11B7/13925 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An optical head, an optical disc device and an information processing device are capable of suppressing the amount of third-order astigmatism created upon recording or reproducing information on or from a multi-layer optical disc including at least three information recording surfaces. An objective lens satisfies a relationship of tc>(t0+tn)/2 assuming that t0 denotes the thickness of a light transmitting layer from the outer surface of the multi-layer optical disc to an information recording surface having the largest light transmitting layer thickness, tn denotes the thickness of a light transmitting layer from the outer surface of the multi-layer optical disc to an information recording surface having the smallest light transmitting layer thickness and tc denotes the thickness of a virtual light transmitting layer at which the absolute value of a third-order spherical aberration is minimum when blue-violet laser light is incident as parallel light on the objective lens.

摘要翻译： 光头，光盘装置和信息处理装置能够抑制在包括至少三个信息记录表面的多层光盘上记录或再现信息时产生的三阶散光量。 假设t0表示从多层光盘的外表面到具有最大透光层厚度的信息记录表面的透光层的厚度，物镜满足tc>（t0 + tn）/ 2的关系 ，tn表示从多层光盘的外表面到具有最小透光层厚度的信息记录表面的透光层的厚度，tc表示虚拟透光层的厚度，其中绝对值 当蓝紫色激光作为平行光入射到物镜上时，三阶球面像差最小。

公开(公告)号：US20120201114A1

公开(公告)日：2012-08-09

申请号：US13502600

申请日：2010-10-20

申请人： Kousei Sano

发明人： Kousei Sano

IPC分类号： G11B7/135 ,  F21V9/14

CPC分类号： G11B7/1365 ,  G11B7/1387

摘要： An optical pickup, an optical recording/reproducing device, a computer, an optical disk recorder, and a minute spot forming method that can enable light propagation with a high transmittance and can form a minute spot. The optical pickup includes a wavelength plate (202) that converts the polarization state of the light beam emitted from a semiconductor laser (101) and an objective lens optical system (105) that converges the light beam whose polarization state has been converted with a numerical aperture greater than 1. The wavelength plate (202) generates a light beam having a polarization state that differs depending on location. The polarization distribution of the light beam generated by the wavelength plate (202) is axially symmetric with respect to the optical axis of the light beam as an axis of symmetry. A light ray on the light axis is a circularly polarized light. Part of a light ray other than the light ray on the optical axis is an elliptically polarized light with an ellipticity of less than 1. An angle formed by a long axis of an ellipse and a circumferential direction of a circle centered on the light axis in each elliptically polarized light is less than ±45 degrees.

摘要翻译： 光学拾取器，光学记录/再现装置，计算机，光盘记录器和微点形成方法，其能够实现具有高透射率的光传播并且可以形成微小点。 光拾取器包括波长板（202），其转换从半导体激光器（101）发射的光束的偏振状态和物镜光学系统（105），该偏振状态使偏振状态已被转换的光束以数字 孔径大于1.波长板（202）产生具有根据位置而不同的偏振状态的光束。 由波长板（202）产生的光束的偏振分布相对于作为对称轴的光束的光轴轴向对称。 光轴上的光线是圆偏振光。 在光轴上的光线以外的光线的一部分是椭圆率小于1的椭圆偏振光。由椭圆的长轴和以光轴为中心的圆的圆周方向形成的角度 每个椭圆偏振光小于±45度。

公开(公告)号：US08094543B2

公开(公告)日：2012-01-10

申请号：US12634042

申请日：2009-12-09

申请人： Masahito Nakao ,  Yasumori Hino ,  Yoshiaki Komma ,  Fumitomo Yamasaki ,  Kousei Sano

发明人： Masahito Nakao ,  Yasumori Hino ,  Yoshiaki Komma ,  Fumitomo Yamasaki ,  Kousei Sano

IPC分类号： G11B7/00

CPC分类号： G11B7/1267 ,  G11B7/005 ,  G11B7/24038 ,  G11B7/26

摘要： An information recording medium according to the present invention includes at least three information recording layers. If the readout power of a laser beam in reading information from an information recording layer L(n) is identified by Pw(n), and if the readout power of the laser beam in reading information from an information recording layer L(n+a) is identified by Pw(n+a), then a base thickness between the information recording layers is determined so that the intensity of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n) becomes equal to or lower than that of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n+a).

摘要翻译： 根据本发明的信息记录介质包括至少三个信息记录层。 如果从信息记录层L（n）读取信息中的激光束的读出功率被Pw（n）识别，并且如果从信息记录层L（n + a）读取信息中的激光束的读出功率 ）由Pw（n + a）识别，则信息记录层之间的基底厚度被确定为当信息记录层L（n + a）被激光束照射时具有读出功率的光的强度 当信息记录层L（n + a）被具有读出功率Pw（n + a）的激光束照射时，Pw（n）变得等于或低于光的光。

公开(公告)号：USRE42825E1

公开(公告)日：2011-10-11

申请号：US11805282

申请日：2007-05-22

申请人： Shin-Ichi Kadowaki ,  Yoshiaki Komma ,  Kousei Sano

发明人： Shin-Ichi Kadowaki ,  Yoshiaki Komma ,  Kousei Sano

IPC分类号： G11B7/00

CPC分类号： G11B7/094 ,  G11B7/0055 ,  G11B7/0903 ,  G11B2007/0013

摘要： An optical pickup head device includes a diffraction grating for generating zero-order diffracted light and at least first-order diffracted light and provides a tracking error signal with a DPP method. The diffraction grating includes grating patterns with a nonuniform period or phase. The size of the first-order diffracted light converged on an optical recording medium is larger in the direction parallel to a tangent to the track than in the direction perpendicular to the tangent. P1/P0>PW2/PW1 is established, where PW1 represents the power that is required to record information on the optical recording medium, PW2 represents the maximum power that allows information recorded on the optical recording medium to be reproduced without being erased, P0 represents the light amount of the zero-order diffracted light converged on the optical recording medium, and P1 represents the light amount of the at least first-order diffracted light converged on the optical recording medium. This configuration makes it possible to detect a tracking error signal with reduced offset, even if a recordable optical recording medium having two information recording planes is used.

摘要翻译： 光拾取头装置包括用于产生零级衍射光和至少一级衍射光的衍射光栅，并提供具有DPP方法的跟踪误差信号。 衍射光栅包括具有不均匀周期或相位的光栅图案。 会聚在光学记录介质上的一级衍射光的尺寸在平行于轨道的切线的方向上大于在垂直于切线的方向上的尺寸。 P1 / P0> PW2 / PW1，其中PW1表示在光学记录介质上记录信息所需的功率，PW2表示允许记录在光学记录介质上的信息被再现而不被擦除的最大功率，P0表示 零级衍射光的光量会聚在光学记录介质上，P1表示会聚在光学记录介质上的至少一级衍射光的光量。 该配置使得即使使用具有两个信息记录平面的可记录光学记录介质，也可以检测具有减小的偏移的跟踪误差信号。

公开(公告)号：US20110170389A1

公开(公告)日：2011-07-14

申请号：US13071914

申请日：2011-03-25

申请人： Kousei Sano ,  Yoshiaki Komma ,  Yasumori Hino

发明人： Kousei Sano ,  Yoshiaki Komma ,  Yasumori Hino

IPC分类号： G11B7/00

CPC分类号： G11B7/268 ,  G11B7/00375 ,  G11B2007/0013

摘要： An optical information medium measurement method of the present invention, for measuring a degree of modulation in an optical information medium of a multilayered structure having a plurality of information layers, includes a first step of measuring the modulation degree of each layer of the optical information medium, by use of a measurement optical system, a second step of obtaining a thickness between layers of the optical information medium, a third step of obtaining a reflectance of each layer of the optical information medium, and a fourth step of converting the modulation degree of each layer, the modulation degree being measured in the first step, into a modulation degree at a reference optical system differing from the measurement optical system, based on a value indicative of the thickness between layers, the thickness being obtained in the second step, and a value indicative of the reflectance of each layer, the reflectance being obtained in the third step.

摘要翻译： 本发明的光信息介质测量方法，用于测量具有多个信息层的多层结构的光信息介质中的调制度，包括测量光信息介质的每一层的调制度的第一步骤 通过使用测量光学系统，获得光学信息介质的层之间的厚度的第二步骤，获得光学信息介质的每一层的反射率的第三步骤和转换光信息介质的调制度的第四步骤 基于表示层之间的厚度的值，在第二步骤中获得的厚度和在第一步骤中获得的厚度，将在第一步骤中测量的调制度调整为与测量光学系统不同的参考光学系统的调制度，以及 表示每层的反射率的值，第三步骤中得到的反射率。

公开(公告)号：US07558170B2

公开(公告)日：2009-07-07

申请号：US11981366

申请日：2007-10-31

申请人： Shin-ichi Kadowaki ,  Kousei Sano ,  Akihiro Arai ,  Katsuhiko Yasuda ,  Tomotada Kamei ,  Hiroaki Yamamoto ,  Fumitomo Yamasaki

发明人： Shin-ichi Kadowaki ,  Kousei Sano ,  Akihiro Arai ,  Katsuhiko Yasuda ,  Tomotada Kamei ,  Hiroaki Yamamoto ,  Fumitomo Yamasaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1381 ,  G11B7/0901 ,  G11B7/0903 ,  G11B7/0941 ,  G11B7/0943 ,  G11B7/0948 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/13927 ,  G11B2007/0013

摘要： An optical information apparatus of the present invention includes: an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a tracking error signal generator. An optical recording medium has tracks arranged substantially at a constant pitch. An average of a pitch is tp. When a main beam is placed on the track, a first sub-beam and a second sub-beam are placed between the tracks. The tracking error signal generator performs a differential arithmetic operation with respect to signals output from a light-receiving portion receiving the main beam to generate a first push-pull signal, performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal, and performs a differential arithmetic operation with respect to the first push-pull signal and the second push-pull signal to generate a tracking error signal, in a case where an amplitude of the first push-pull signal obtained at the pitch tp is fluctuated when the light beam is scanned in a direction orthogonal to the tracks of the optical recording medium.

摘要翻译： 本发明的光信息装置包括：光拾取头，包括：光源; 衍射单位; 冷凝单元; 分束器; 光检测器; 和跟踪误差信号发生器。 光记录介质具有基本上以恒定间距布置的轨道。 平均音高是tp。 当主光束被放置在轨道上时，第一子光束和第二子光束被放置在轨道之间。 跟踪误差信号发生器对从接收主波束的光接收部分输出的信号执行差分运算，产生第一推挽信号，对从光接收部分输出的信号执行差分运算 接收第一子光束和第二子光束以产生第二推挽信号，并且相对于第一推挽信号和第二推挽信号执行差分算术运算以产生跟踪误差信号， 当在与光记录介质的轨道正交的方向上扫描光束时，以间距tp获得的第一推挽信号的幅度波动的情况。