公开(公告)号：US20060029342A1

公开(公告)日：2006-02-09

申请号：US11249808

申请日：2005-10-13

申请人： Masateru Tadakuma ,  Yu Mimura ,  Misao Sakano ,  Osamu Aso ,  Takeshi Nakajima ,  Katsutoshi Takahashi

发明人： Masateru Tadakuma ,  Yu Mimura ,  Misao Sakano ,  Osamu Aso ,  Takeshi Nakajima ,  Katsutoshi Takahashi

IPC分类号： G02B6/00

CPC分类号： G01M11/3172 ,  G01M11/31 ,  G01M11/3181 ,  G01M11/319 ,  G01M11/39

摘要： A method of simultaneously specifying the wavelength dispersion and nonlinear coefficient of an optical fiber. Pulsed probe light and pulsed pump light are first caused to enter an optical fiber to be measured. Then, the power oscillation of the back-scattered light of the probe light or idler light generated within the optical fiber is measured. Next, the instantaneous frequency of the measured power oscillation is obtained, and the dependency of the instantaneous frequency relative to the power oscillation of the pump light in a longitudinal direction of the optical fiber is obtained. Thereafter, a rate of change in the longitudinal direction between phase-mismatching conditions and nonlinear coefficient of the optical fiber is obtained from the dependency of the instantaneous frequency. And based on the rate of change, the longitudinal wavelength-dispersion distribution and longitudinal nonlinear-coefficient distribution of the optical fiber are simultaneously specified.

公开(公告)号：US20050138534A1

公开(公告)日：2005-06-23

申请号：US10973127

申请日：2004-10-26

申请人： Takeshi Nakajima ,  Keisuke Fujimoto ,  Youichi Ogura

发明人： Takeshi Nakajima ,  Keisuke Fujimoto ,  Youichi Ogura

IPC分类号： G11B20/10 ,  G11B20/18 ,  H03M13/00 ,  H03M13/03

CPC分类号： G11B20/18 ,  G11B2020/1863 ,  H03M13/395 ,  H03M13/41 ,  H03M13/6508

摘要： A maximum likelihood encoding apparatus is provided, which is constructed to be compatible with a plurality of signals reproduced from a plurality of recording media having a plurality of types. The apparatus comprises a path metric value generation section for generating a plurality of path metric values corresponding to a recording medium having one of the plurality of types based on a type signal indicating the one of the plurality of types, and a path memory section for detecting digital information from a signal reproduced from the recording medium having the one of the plurality of types based on the plurality of path metric values.

摘要翻译： 提供了一种最大似然编码装置，其被构造为与从具有多种类型的多个记录介质再现的多个信号兼容。 该装置包括：路径度量值生成部，用于基于表示多种类型中的一种的类型信号，生成与具有多种类型中的一种的记录介质对应的多个路径度量值;以及路径存储部， 基于多个路径度量值，从具有多种类型中的一种的记录介质再现的信号的数字信息。

公开(公告)号：US06501896B2

公开(公告)日：2002-12-31

申请号：US09964684

申请日：2001-09-28

申请人： Kazutaka Nara ,  Takeshi Nakajima ,  Kazuhisa Kashihara

发明人： Kazutaka Nara ,  Takeshi Nakajima ,  Kazuhisa Kashihara

IPC分类号： G02B610

CPC分类号： G02B6/126 ,  G02B6/105 ,  G02B6/12023 ,  G02B6/1203 ,  G02B6/132

摘要： The present invention relates to an optical waveguide circuit such as an arrayed waveguide grating, etc. A lower cladding is formed on a silicon substrate. A core having the following waveguide construction is formed thereon. That is, an input side slab waveguide is connected to the emission side of a plurality of incidence waveguides, a plurality of arrayed waveguides having different lengths form each other are juxtaposed at and connected to the emission side thereof, an output side slab waveguide is further connected to the emission side thereof, and a plurality of emission waveguides are connected to the emission side thereof, thereby causing the abovementioned waveguide construction. The upper cladding covers up the core. The cladding and core are made of silica-based glass, wherein the value B of birefringence occurring in said optical waveguide portion is |B|≦5.34×10−5, and &agr;s−2.0×10−7≦&agr;g ≦&agr;s+2.0×10−7 is established where it is assumed that the thermal expansion coefficient of the upper cladding is &agr;g, and the thermal expansion coefficient of a silicon substrate is &agr;s.

摘要翻译： 本发明涉及诸如阵列波导光栅等的光波导电路。在硅衬底上形成下包层。 在其上形成具有以下波导结构的芯。 也就是说，输入侧平板波导连接到多个入射波导的发射侧，彼此不同长度的多个阵列波导并置并连接到发射侧，输出侧平板波导进一步 连接到其发射侧，并且多个发射波导连接到其发射侧，从而引起上述波导结构。 上部包层覆盖核心。 包层和芯由二氧化硅基玻璃制成，其中在所述光波导部分中出现的双折射值B为| B | <= 5.34×10-5，而α≤2.0×10-7 <= alphag <= alphas + 2.0 建立了x10-7，其中假定上包层的热膨胀系数为alphag，硅衬底的热膨胀系数为α。

公开(公告)号：US06434098B1

公开(公告)日：2002-08-13

申请号：US09840874

申请日：2001-04-25

申请人： Shinichi Konishi ,  Takeshi Nakajima ,  Harumitsu Miyashita ,  Toshihiko Takahashi ,  Toshiya Akagi ,  Yuji Hisakado ,  Yukihiro Yamasaki

发明人： Shinichi Konishi ,  Takeshi Nakajima ,  Harumitsu Miyashita ,  Toshihiko Takahashi ,  Toshiya Akagi ,  Yuji Hisakado ,  Yukihiro Yamasaki

IPC分类号： G11B700

摘要： An optical disc drive usable with discs to which data is continuously recorded and discs having a sector format can quickly resume playback signal output after passing imperfection causing potential reading errors, and plays disc with few read errors. A detection signal generator detects DC level fluctuation in the playback signal read from the disc and generates a detection signal tracking the DC level fluctuation. A selector selects a detection signal or a null signal without valid polarity based on the detection signal generated by the detection signal generator and input to the selector. A clamping unit performs a clamping process to suppress DC level fluctuation in the playback signal based on the detection signal when the selection unit selects the detection signal, and does not perform the clamping process when the selection unit selects the null signal. A signal processor performs specific signal processes based on clamping unit output.

公开(公告)号：US06418249B1

公开(公告)日：2002-07-09

申请号：US09581523

申请日：2000-07-06

申请人： Shiro Nakamura ,  Takeshi Nakajima ,  Kanji Tanaka

发明人： Shiro Nakamura ,  Takeshi Nakajima ,  Kanji Tanaka

IPC分类号： G02B628

CPC分类号： G02B6/12014

摘要： An optical multiplexer/demultiplexer including an arrayed waveguide grating having a plurality of waveguides and formed at its both end with an input-side slab waveguide and an output-side slab waveguide. A reference input waveguide and correction input waveguides are provided on the input end face of the input-side slab waveguide and a plurality of output waveguides are connected to the output end face of the output-side slab waveguide. The correction input waveguide has an output end face thereof placed apart by a distance from the input end face of the input-side slab waveguide in the lengthwise direction of the slab waveguide and has an acute angle to a plane perpendicular to the optical axis of this waveguide, thus permitting an optical signal to be input at a position apart from a light-incident position for the reference input waveguide by a distance shorter than a waveguide disposition interval, thereby optimally correcting a deviation of the center wavelength of the optical signal.

摘要翻译： 一种光复用器/解复用器，包括具有多个波导的阵列波导光栅，并在其两端形成有输入侧平板波导和输出侧平板波导。 参考输入波导和校正输入波导设置在输入侧平板波导的输入端面上，并且多个输出波导连接到输出侧平板波导的输出端面。 校正输入波导的输出端面在平板波导的长度方向上与输入侧平板波导的输入端面隔开一段距离，并且与垂直于该波导的光轴的平面成锐角 波导，从而允许光信号在距参考输入波导的光入射位置远离波导配置间隔的距离处被输入，从而最佳地校正光信号的中心波长的偏差。

公开(公告)号：US06415072B1

公开(公告)日：2002-07-02

申请号：US09543590

申请日：2000-04-05

申请人： Naoki Hashizume ,  Hiroyuki Koshi ,  Takeshi Nakajima ,  Kanji Tanaka

发明人： Naoki Hashizume ,  Hiroyuki Koshi ,  Takeshi Nakajima ,  Kanji Tanaka

IPC分类号： G02B628

CPC分类号： G02B6/12016 ,  G02B6/30

摘要： The present invention relates to an optical wavelength multiplexing and dividing device of an array waveguide type diffraction lattice, which is capable of separating and picking up wavelength-multiplexed signals of various wavelengths, which are used in optical transmissions. An input side slab waveguide (3), a plurality of juxtaposed array waveguides (4), an output side slab waveguide (5) and a plurality of optical output waveguides (6) are connected, in order, to the outgoing sides of a plurality of optical input waveguides (2), thereby forming a waveguide pattern. The array waveguides (4) are formed so as to have lengths different from each other to cause the phases of individual lights to be deviated after propagating through the respective array type waveguides (4), wherein different lights as per wavelength are condensed at the incident ends (7) of optical output waveguides 6 by passing through the output side slab waveguides (5) and are outputted through the optical output waveguides (6). The incident ends (7a) of the optical output waveguides (6) are provided at a light condensing predicted position of lights of the respective wavelengths where the lights are predicted to be condensed through the output side slab waveguide (5), and the incident ends (7b) of the optical output waveguides (6) are provided at a light condensing prediction corrected position where the light condensing position is shifted with respect to the light condensing predicted position.

摘要翻译： 本发明涉及阵列波导型衍射光栅的光波分复用和分割装置，其能够分离和拾取在光传输中使用的各种波长的波分复用信号。 输入侧平板波导（3），多个并列阵列波导（4），输出侧平板波导（5）和多个光输出波导（6）依次连接到多个 的光输入波导（2），从而形成波导图案。 阵列波导（4）形成为具有彼此不同的长度，以使各个光的相位在通过各个阵列型波导（4）传播之后偏离，其中根据波长的不同的光在入射时被会聚 通过输出侧平板波导（5）通过光输出波导6的端部（7），并通过光输出波导（6）输出。 光输出波导（6）的入射端（7a）设置在通过输出侧平板波导（5）预测光被冷凝的各波长的光的聚光预测位置，入射端 光输出波导（6）的光（7b）设置在聚光预测校正位置，其中聚光位置相对于聚光预测位置偏移。

公开(公告)号：US06393170B1

公开(公告)日：2002-05-21

申请号：US09582084

申请日：2000-06-22

申请人： Takeshi Nakajima ,  Naoki Hashizume ,  Kanji Tanaka

发明人： Takeshi Nakajima ,  Naoki Hashizume ,  Kanji Tanaka

IPC分类号： G02B612

CPC分类号： G02B6/12016

摘要： An optical multiplexer/demultiplexer 1 having a plurality of first waveguides 3, a first slab waveguide 4, an arrayed waveguide grating 5 having a plurality of waveguides, a second slab waveguide 6 and a plurality of second waveguides 7, the individual waveguides being connected in the above order. The ratio of a distance between the plurality of first waveguides 3 at a connecting portion with the first slab waveguide 4 to a distance between the plurality of second waveguides 7 at a connecting portion with the second slab waveguide 6 differs from a ratio of a focal length of the first slab waveguide 4 to a focal length of the second slab waveguide 6.

摘要翻译： 具有多个第一波导3，第一平板波导4，具有多个波导的阵列波导光栅5，第二平板波导6和多个第二波导7的光复用器/解复用器1，各个波导连接在 以上订单。 在与第一平板波导4的连接部分处的多个第一波导3之间的距离与在与第二平板波导6的连接部分处的多个第二波导7之间的距离的比率与焦距 的第一平板波导4的第二平板波导6的焦距。

公开(公告)号：US5743722A

公开(公告)日：1998-04-28

申请号：US654790

申请日：1996-05-29

申请人： Eiten Chin ,  Toshiharu Numata ,  Masayuki Sugawa ,  Takeshi Nakajima

发明人： Eiten Chin ,  Toshiharu Numata ,  Masayuki Sugawa ,  Takeshi Nakajima

IPC分类号： B05C5/02 ,  B05C9/06 ,  B05D1/26 ,  B29C47/02 ,  B05D3/12

CPC分类号： B29C47/025 ,  B05C5/0254 ,  B05C9/06 ,  B29C47/0021

摘要： A coating apparatus wherein downstream lips have coating work surfaces respectively where a magnetic dispersoid contacts with a web. A coating work surface of a second downstream lip which is positioned downstream with respect to the web feeding direction is set in a position so as to be apart from the web more than a tangential line which extends from a downstream end of a coating work surface of a first downstream lip which is positioned upstream with respect to the web feeding direction.

摘要翻译： 一种涂布设备，其中下游嘴唇分别具有涂覆工作表面，其中磁性分散体与网状物接触。 相对于幅材供给方向位于下游的第二下游唇缘的涂覆工作表面设置在与从纸幅分离的位置上，该切线从从涂布工作表面的下游端延伸的切线 第一下游唇缘，其位于相对于腹板进给方向的上游。

公开(公告)号：US5541462A

公开(公告)日：1996-07-30

申请号：US233757

申请日：1994-04-26

申请人： Katsutoshi Nii ,  Ichiro Hashimoto ,  Takeshi Nakajima ,  Sueo Akashi

发明人： Katsutoshi Nii ,  Ichiro Hashimoto ,  Takeshi Nakajima ,  Sueo Akashi

IPC分类号： F16C17/02 ,  F16C33/10 ,  F16C33/74 ,  F16J15/43 ,  H02K5/16 ,  H02K7/08 ,  F16C32/06 ,  H02K7/09

CPC分类号： F16C33/1035 ,  F16C17/10 ,  F16C33/746 ,  H02K5/1675

摘要： A rotary body bearing apparatus has a bearing supporting member, a radial bearing member, a bearing chamber formed in the bearing supporting member for holding the radial bearing member, a rotative shaft supported rotatively by the radial bearing member, and lubricating oil filling a bearing clearance between the rotative shaft and the radial bearing member. An air bubble restraint means restrains the occurrence of air bubbles generated in the lubricating oil by the rotation of the rotative shaft. Even when the rotative shaft rotates at the high speed of rotation, by the provision of the air bubble occurrence restraint means, the occurrence of air bubbles generated in the lubricating oil can be restrained, high accuracy rotation can be maintained and a rotation number fluctuation of the rotary body can be reduced.

摘要翻译： 旋转体轴承装置具有轴承支撑构件，径向轴承构件，形成在用于保持径向轴承构件的轴承支撑构件中的轴承室，由径向轴承构件旋转地支撑的旋转轴和填充轴承间隙的润滑油 在旋转轴和径向轴承构件之间。 气泡限制装置通过旋转轴的旋转来限制在润滑油中产生的气泡的发生。 即使当旋转轴以高速旋转时，通过设置气泡发生抑制装置，可以抑制在润滑油中产生的气泡的发生，可以保持高精度的旋转和旋转数的波动 可以减小旋转体。

公开(公告)号：US5526064A

公开(公告)日：1996-06-11

申请号：US407447

申请日：1995-03-20

申请人： Takenao Okugawa ,  Yuji Iwai ,  Takeshi Nakajima

发明人： Takenao Okugawa ,  Yuji Iwai ,  Takeshi Nakajima

IPC分类号： B29C45/00 ,  H04N5/64 ,  H04R1/02 ,  H04N5/65 ,  B28B7/22

CPC分类号： B29C45/0046 ,  H04N5/642

摘要： A cabinet molded in resin has a grill portion molded in resin by using a predetermined metal mold and having a plurality of holes of small diameter defined in the vertical and horizontal directions. This cabinet is composed of a plurality of substantially straight-lined reinforcing ribs formed on the rear surface of the grill portion, wherein the reinforcing ribs are disposed with a predetermined angle with respect to the direction in which a resin supplied from a resin injection nozzle to the metal mold is flowed upon molding and the reinforcing ribs cross one another.

摘要翻译： 模制在树脂中的机壳具有通过使用预定的金属模具成型在树脂中的格栅部分，并且具有在垂直和水平方向上限定的多个小直径的孔。 该柜由形成在格栅部的后表面上的多个大致直线的加强筋构成，其中，加强肋相对于从树脂注入喷嘴供给的树脂的方向成为规定的角度， 金属模具在模制时流动，并且加强筋彼此交叉。