公开(公告)号：US5999296A

公开(公告)日：1999-12-07

申请号：US864623

申请日：1997-05-28

申请人： Yozo Nishiura

发明人： Yozo Nishiura

IPC分类号： G01S1/70 ,  G08G1/0967 ,  H04B10/00 ,  B60Q1/00

CPC分类号： G08G1/096716 ,  G01S1/70 ,  G08G1/096758 ,  G08G1/096783 ,  H04B10/1143

摘要： In an optical head for optical beacon, a prism 5 is arranged immediately after light emitting elements 1 of an optical head 10 in light radiating directions of the light emitting elements 1, so that the paths along which light rays travel immediately after the radiation can be curved by the prism 5. As a result of this configuration, if the index of refraction of a material of which the prism 5 is made and the angle of a slope of the prism 5 are set to proper values, the light rays can be injected from the prism 5 to an optical head 10 on the side of a light receiving element 2 in arbitrary directions. Further, a surface 21 of a body 13 in which a transmission window 14 is formed is so shaped as to be inclined backward with respect to the travelling direction of an automobile from an upper edge a to a lower edge b. An image of the surface 21 of the body 13 in which the transmission window 14 is formed is not mirrored on a windshield glass 20 as long as the image is that of a surface portion below the upper edge a excluding the upper edge a. Other part of the body 13 than the surface 21 in which the transmission window 14 is formed is subjected to a surface treatment for preventing the mirroring of an image.

摘要翻译： 在用于光信标的光学头中，棱镜5在发光元件1的光辐射方向上紧接在光学头10的发光元件1之后，使得光线在辐射之后立即行进的路径可以是 作为该结构的结果，如果将棱镜5的材料的折射率和棱镜5的斜率的角度设置为适当的值，则可以注射光线 从棱镜5到光接收元件2的任意方向的光学头10。 此外，其中形成有透光窗14的本体13的表面21被成形为相对于汽车的行进方向从上边缘a到下边缘b向后倾斜。 只要图像是除了上边缘a之外的上边缘a以下的表面部分的图像，则形成有透射窗14的主体13的表面21的图像不会被镜像在挡风玻璃20上。 经过形成透射窗14的表面21的主体13的其他部分进行表面处理以防止图像的镜像。

公开(公告)号：US5386484A

公开(公告)日：1995-01-31

申请号：US118809

申请日：1993-09-09

申请人： Akihiro Ooka ,  Kenji Kawamura ,  Yozo Nishiura ,  Katsuaki Itoh ,  Takaki Iwashita ,  Yasuhiko Nishi ,  Noritaka Kuroda ,  Hayato Hasegawa

发明人： Akihiro Ooka ,  Kenji Kawamura ,  Yozo Nishiura ,  Katsuaki Itoh ,  Takaki Iwashita ,  Yasuhiko Nishi ,  Noritaka Kuroda ,  Hayato Hasegawa

IPC分类号： G01C19/72 ,  G02B6/10 ,  G02B6/34 ,  G02B6/44 ,  G02B6/17

CPC分类号： G02B6/274 ,  G01C19/722 ,  G02B6/105 ,  G02B6/276 ,  G02B6/4457

摘要： An optical fiber type polarizer comprises a first optical fiber constituted by a birefringent optical fiber wound at a predetermined winding radius and having winding start and end fixed to each other by an adhesive, the first optical fiber having short extra portions respectively extending from the winding start and end, and the length of each of the short extra porions being at least as small as the predetermined winding radius. The optical fiber type polarizer further comprises a second optical fiber spliced to one of the short extra portions of the first optical fiber, and a third optical fiber spliced to the other of the short extra portions of the first optical fiber.

摘要翻译： 一种光纤型偏振器包括：由双折射光纤构成的第一光纤，该双折射光纤以预定的绕组半径缠绕并且具有通过粘合剂彼此固定的卷绕开始和端部，所述第一光纤具有分别从卷绕开始延伸的多个额外部分 并且结束，并且每个短的额外部分的长度至少与预定的绕组半径一样小。 光纤型偏振器还包括接合到第一光纤的短额外部分之一的第二光纤，以及与第一光纤的短额外部分中的另一个接合的第三光纤。

公开(公告)号：US5365339A

公开(公告)日：1994-11-15

申请号：US2060

申请日：1993-01-08

申请人： Yozo Nishiura ,  Yasuhiko Nishi

发明人： Yozo Nishiura ,  Yasuhiko Nishi

IPC分类号： G01C19/72 ,  G02B6/34 ,  G01C19/64

CPC分类号： G01C19/721

摘要： A fiber-optic gyroscope has a polarizer, a fiber coil and couplers. A light beam is polarized, divided into two beams and introduced into the fiber coil. Two depolarizers are provided; one between a light source and a polarizer, the other between the fiber coil and a coupler. To clarify the condition for avoiding interference between two depolarizers is a purpose of this invention. Four birefringent materials A, B C and D should satisfy inequalities;.vertline.P.sub.a B.sub.a L.sub.a +P.sub.b B.sub.b L.sub.b +P.sub.o B.sub.o L.sub.o +P.sub.d B.sub.d L.sub.d .vertline.-B.sub.5 L.sub.5 >Cwhere P.sub.a, P.sub.b, P.sub.o, and P.sub.d are triplet factors which take one of -1, 0 or +1 independently, B.sub.a, B.sub.b, B.sub.o and B.sub.d are birefringence and L.sub.a, L.sub.b, L.sub.o and L.sub.d are lengths of A, B, D and D. B.sub.5 L.sub.5 is extra birefringency of the fiber coil or couplers.

摘要翻译： 光纤陀螺仪具有偏振器，光纤线圈和耦合器。 光束被极化，分成两束并引入光纤线圈。 提供两种去极化剂; 一个在光源和偏振器之间，另一个在光纤线圈和耦合器之间。 为了阐明避免两个消偏振器之间的干扰的条件是本发明的目的。 四种双折射材料A，B C和D应满足不等式; | PaBaLa + PbBbLb + PoBoLo + PdBdLd | -B5L5> C其中Pa，Pb，Po和Pd是独立地取-1,0或+1之一的三重因子，Ba，Bb，Bo和Bd是双折射和La， Lb，Lo和Ld是A，B，D和D的长度.B5L5是纤维线圈或耦合器的额外双折射率。

公开(公告)号：US5444533A

公开(公告)日：1995-08-22

申请号：US114095

申请日：1993-08-31

申请人： Yozo Nishiura ,  Takaki Iwashita ,  Akihiro Ooka

发明人： Yozo Nishiura ,  Takaki Iwashita ,  Akihiro Ooka

IPC分类号： G02B6/00 ,  G01C19/72 ,  H01S3/07 ,  H01S3/083

CPC分类号： G01C19/721

摘要： Conventional fiber-optic gyroscopes were provided with an independent photodetector for detecting interfering beams. The existence of the independent photodetector required two beam dividing-and-combining devices for equalizing the experiences of the clockwise-spreading beams and the counterclockwise-spreading beams. Curtailment of an expensive beam dividing-and-combining device is desirable for reducing the cost of gyroscopes. This invention dispenses with the independent photodetector. Instead of the independent photodetector, the light source itself or the monitoring photodiode detects the interfering beams by the change of driving current, applied voltage or photocurrent. Elimination of the independent photodetector saves one beam dividing-and-combining device by equalizing the path of the progressing beams to the path of the regressing beams. Optimum light sources, interposition of polarizer, position of depolarizer and use of birefringent material as polarizer are explained.

摘要翻译： 传统的光纤陀螺仪设有独立的光电检测器，用于检测干涉光束。 独立光电检测器的存在需要两个光束分割和组合装置，用于均衡顺时针扩展光束和逆时针扩展光束的经验。 昂贵的光束分割和组合装置的缩减对于降低陀螺仪的成本是期望的。 本发明省去了独立的光电探测器。 代替独立光电检测器，光源本身或监控光电二极管通过驱动电流，施加电压或光电流的变化来检测干扰光束。 消除独立的光电探测器通过将前进光束的路径均衡到回归光束的路径来节省一个光束分割和合成装置。 解释了最佳光源，偏振器的插入，去偏振器的位置以及双折射材料作为偏振器的用途。

公开(公告)号：US5245407A

公开(公告)日：1993-09-14

申请号：US748541

申请日：1991-08-22

申请人： Yozo Nishiura ,  Takaki Iwashita

发明人： Yozo Nishiura ,  Takaki Iwashita

IPC分类号： G01C19/72

CPC分类号： G01C19/721

摘要： A fiber-optic gyroscope having a depolarizer installed near the fiber coil and a polarizer disposed in the optical path before the light is divided in two partial lights to avoid the fluctuation of the light power passing reversely through the polarizer induced by the rotation of the polarization plane of the light. However, since the light emitting device emits a linearly polarized light, the light power first passing through the polarizer will fluctuate by the rotation of the polarization plane. This invention adds another depolarizer between the light emitting device and the polarizer in order to kill such a fluctuation.

公开(公告)号：US6100943A

公开(公告)日：2000-08-08

申请号：US897987

申请日：1997-07-08

申请人： Nobuaki Koide ,  Yasuyo Matsumoto ,  Yozo Nishiura ,  Kensaku Takada

发明人： Nobuaki Koide ,  Yasuyo Matsumoto ,  Yozo Nishiura ,  Kensaku Takada

IPC分类号： B60K37/02 ,  G02B27/01 ,  G02F1/1335 ,  G02B27/14

CPC分类号： B60K37/02 ,  G02B27/01 ,  G02B27/0101 ,  B60K2350/1064 ,  B60K2350/2052

摘要： A display device for a transportation includes: a display unit displaying a display image on front and rear face sides, the display images displayed on the rear face side being in mirror image relationship with each other; and an optical member for inverting the display image displayed on the rear face side; wherein the display image displayed on the front face side is directly seen by a driver and the display image displayed on the rear face side is inverted by the optical member, so as to see in the same direction of the display image displayed on the front face side. The above display unit may be constituted by a light source having plural color spectra; an attenuation filter in which a transmittance for light emitted from the light source can be partly changed by an external signal; and a transparent light guide plate which guides light emitted from the light source to at least one of front and rear faces of the attenuation filter.

摘要翻译： 用于运输的显示装置包括：显示单元，其在前侧和后面侧显示显示图像，显示在背面侧的显示图像彼此成镜像关系; 以及光学构件，用于反转显示在背面侧的显示图像; 其中显示在正面侧的显示图像被驾驶员直接看到，并且通过光学构件将显示在背面侧的显示图像反转，以便在与正面上显示的显示图像相同的方向上看到 侧。 上述显示单元可以由具有多个色谱的光源构成; 衰减滤波器，其中从光源发射的光的透射率可以通过外部信号部分地改变; 以及将从光源发射的光引导到衰减滤波器的前表面和后表面中的至少一个的透明导光板。

公开(公告)号：US5526115A

公开(公告)日：1996-06-11

申请号：US348089

申请日：1994-11-25

申请人： Yozo Nishiura

发明人： Yozo Nishiura

IPC分类号： G01C19/72 ,  G02B6/00 ,  H01S3/07 ,  H01S3/083

CPC分类号： G01C19/721

摘要： A source-sensitive gyroscope guides light beams emitted from a light emitting device into both ends of the fiber coil, makes the beams propagate in the coil clockwise and counterclockwise, and retrieves the beams into the light emitting device itself. The phase difference is obtained from the change of the driving current or the change of the driving voltage of the light emitting device, or from the change of a photocurrent of the monitoring photodetector mounted behind the light emitting device in the light source. A birefringent medium having an optical path difference longer than the coherent length of the light is interposed between the light emitting device and the end of the fiber. When the light beams are non-polarized, the birefringent medium is aligned in the orientation in which the anisotropic axis is perpendicular to the beam line. When the light beams are linearly polarized, the birefringent medium is arranged in the orientation in which the anisotropic axis inclines at 45 degrees to the linear polarization. When a polarizer is equipped in the beam line, the birefringent medium is arranged in the orientation in which the anisotropic axis inclines at 45 degrees to the linear polarization. In any case, the single birefringent medium plays the role of a substantial depolarizer.

摘要翻译： 源敏感陀螺仪将从发光器件发射的光束引导到光纤线圈的两端，使得光束顺时针和逆时针在线圈中传播，并将光束检索到发光器件本身中。 相位差是根据驱动电流的变化或发光器件的驱动电压的变化，或从安装在光源中的发光器件后面的监视光电检测器的光电流的变化获得的。 具有比光的相干长度长的光程差的双折射介质插入在发光器件和光纤的端部之间。 当光束非极化时，双折射介质在各向异性轴垂直于光束线的取向中对齐。 当光束被线偏振时，双折射介质被布置成各向异性轴以45度倾斜到线偏振的方向。 当在光束线中配备偏振器时，双折射介质以各向异性轴线以45度倾斜到线偏振的方向排列。 在任何情况下，单一双折射介质起到实质的去偏振器的作用。

公开(公告)号：US4641913A

公开(公告)日：1987-02-10

申请号：US692872

申请日：1985-01-18

申请人： Yoshikazu Nishiwaki ,  Yozo Nishiura

发明人： Yoshikazu Nishiwaki ,  Yozo Nishiura

IPC分类号： G01J3/28 ,  G02F1/335 ,  G02B6/12

CPC分类号： G02F1/335 ,  G01J3/28

摘要： The present invention provides optical integrated circuits in which both a light function zone and a light reception zone are monolithically formed on the same substrate to obtain high reliability and low noise and loss. The optical integrated circuits according to the present invention have improved electrode structure formed on a light wave guide layer to apply a major portion of the electric field generated by the current flowing in the electrode structure within the light wave guide layer to thus improve light receiving sensitivity. Further, the optical integrated circuits according to the present invention have the light reception zone of the large photoconductive effect on the substrate to develop a light receiving sensitivity to the light function zone without affecting propagation loss.

摘要翻译： 本发明提供了光集成电路，其中光功能区和光接收区两者单片地形成在同一基板上，以获得高可靠性和低噪声和损耗。 根据本发明的光集成电路具有改善的电波结构，形成在光波导层上，以施加由在光波导层内的电极结构中流动的电流产生的电场的大部分，从而提高光接收灵敏度 。 此外，根据本发明的光集成电路具有在基板上具有大的光电导效应的光接收区，以对光功能区产生光接收灵敏度，而不会影响传播损耗。

公开(公告)号：US4569588A

公开(公告)日：1986-02-11

申请号：US486515

申请日：1983-04-19

申请人： Yoshikazu Nishiwaki ,  Yozo Nishiura

发明人： Yoshikazu Nishiwaki ,  Yozo Nishiura

IPC分类号： G01P5/00 ,  G01C19/66 ,  G01J9/00 ,  G01J9/04 ,  G01P3/36 ,  G01S17/58

CPC分类号： G01J9/04 ,  G01S17/58

摘要： A method and apparatus for detecting a frequency change of a light modulates the scattered light from the object of measurement using an acousto-optic modulator or the like, heterodyne-detects the scattered light after modulation to provide an electrical signal having a frequency (f.sub.d -f.sub.m) which is the difference between the Doppler frequency f.sub.d and the modulation frequency f.sub.m, passes this electrical signal to a filter while changing the modulation frequency f.sub.m, and obtains the modulation frequency f.sub.m at which the signal voltage is the largest or the smallest, that is, the Doppler frequency f.sub.d.

摘要翻译： 用于检测光的频率变化的方法和装置使用声光调制器等对来自测量对象的散射光进行调制，外差检测调制后的散射光，以提供具有频率（fd- fm）是多普勒频率fd和调制频率fm之间的差，在改变调制频率fm的同时将该电信号传递给滤波器，并获得信号电压最大或最小的调制频率fm，即， 是多普勒频率fd。

公开(公告)号：US5455676A

公开(公告)日：1995-10-03

申请号：US201459

申请日：1994-02-24

申请人： Yozo Nishiura ,  Yasuhiko Nishi

发明人： Yozo Nishiura ,  Yasuhiko Nishi

IPC分类号： G01C19/72

CPC分类号： G01C19/72

摘要： An AC component of the photodetector includes two quasi-sine waves in a cycle of phase-modulation. T.sub.1 and T.sub.2 are time lengths of the quasi-sine waves. When a fiber coil is rotating, T.sub.1 differs from T.sub.2. The difference between T.sub.1 and T.sub.2 is in proportion to an angular velocity of the fiber coil. This invention obtains the angular velocity by measuring time durations T.sub.1, T.sub.2 or both T.sub.1 and T.sub.2. Zero-crossing detection defines the moments of the beginning and the end of T.sub.1 and T.sub.2. Since this gyroscope depends on the measurement of time lengths, it is fully immune from the fluctuation of light power due to the light source, or the fluctuation of the gain in the electric circuit.

摘要翻译： 光电检测器的AC分量在相位调制周期中包括两个准正弦波。 T1和T2是准正弦波的时间长度。 当光纤线圈旋转时，T1与T2不同。 T1和T2之间的差异与纤维线圈的角速度成比例。 本发明通过测量时间T1，T2或T1和T2两者获得角速度。 过零检测定义T1和T2的开始和结束的时刻。 由于该陀螺仪取决于时间长度的测量，所以完全免受光源引起的光功率波动或电路中增益的波动的影响。