专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH01211736A POLARIZATION DIVERSITY OPTICAL RECEIVER FOR COHERENT OPTICAL COMMUNICATION 失效
公开(公告)号：JPH01211736A
公开(公告)日：1989-08-24
申请号：JP3802188
申请日：1988-02-19
申请人： FUJITSU LTD
发明人： NAITO TAKAO , CHIKAMA TERUMI , WATANABE SHIGEKI , KIYONAGA TETSUYA , ONODA YOSHITO , KUWABARA HIDEO , ONAKA HIROSHI , MIYATA HIDEYUKI
IPC分类号： G02F2/00 , H04B10/25 , H04B10/516 , H04B10/564 , H04B10/61
摘要： PURPOSE:To obtain intermediate frequency signals for the stabilization of an optical local oscillation circuit at any time and to stabilize an intermediate frequency by putting the sum of and the difference between intermediate frequency signals of two polarized wave components after frequency discrimination. CONSTITUTION:When the intermediate frequency signals ep and es are fed back, the sum of those intermediate frequency signals ep and es is outputted from a 1st adder and the difference between those intermediate frequency signals ep and es is outputted by a subtracter 112. Then frequency discriminating circuits 113 and 114 discriminate the frequencies of the sum signals es+ep and the difference signals es-ep and their outputs after the frequency discrimination are added together by a 2nd adder 115. Therefore, both of the sum of and the difference between the intermediate frequency signals ep and es never become zero, so the composite signal never becomes zero. Consequently, at least either of the frequency discriminating circuits can be put in operation and the intermediate frequencies for the stabilization of the optical local oscillation circuit is obtained at any time.

2. 发明专利

JPS6451735A BIDIRECTIONAL TIME DIVISION MULTIPLEX COHERENT LIGHT COMMUNICATION SYSTEM 失效
公开(公告)号：JPS6451735A
公开(公告)日：1989-02-28
申请号：JP20847087
申请日：1987-08-21
申请人： FUJITSU LTD
发明人： MIYATA HIDEYUKI , KUWABARA HIDEO
IPC分类号： G01J9/02 , H04B10/00
摘要： PURPOSE:To simplify the station constitution by using an induced Brillouin scattering light caused by a light led from a transmission light source in an optical transmission light as a local oscillated light so as to eliminate the local oscillation source. CONSTITUTION:A light from a transmission light source 12 of a master station 11 modulated by a modulator 13 is led to an optical transmission line 16 via a photocoupler 15 and led to a photodetector 20 of the slave station via an optical coupler 17. An output light of a transmission light source 19 of the slave station 21 is received by the photodetector 14 of the master station via the modulator 18, the optical coupler 17, the optical transmission line 16 and the photocoupler 15. The system is switched into the 1st state sending a signal light from the master station 11 to the slave station 21 and the 2nd state sending the signal light to the master station 11 from the slave station 21 in time series. Since the detectors 14, 20 of the stations 11, 12 receive the induced Brillouin scattering light caused in the transmission light as the local oscillation source, the station constitution is simplified.

3. 发明专利

JPS631124A DOUBLE BALANCED LIGHT RECEIVER 失效
公开(公告)号：JPS631124A
公开(公告)日：1988-01-06
申请号：JP14283786
申请日：1986-06-20
申请人： FUJITSU LTD
发明人： CHIKAMA TERUMI , KUWABARA HIDEO , KIYONAGA TETSUYA , OSAWA CHIAKI
IPC分类号： H04B10/293 , H04B10/07 , H04B10/2507 , H04B10/564 , H04B10/572
摘要： PURPOSE:To improve the intensity noise suppressing effect by modulating local oscillated laser beam to control the input phase to a photodetector, the gain of the photodetector, the phase of the output signal of the photodetector, etc., so that a modulated signal component included in a reception output signal is minimum. CONSTITUTION:The local oscillated laser beam projected to an optical coupler 1 is modulated by a modulator 4, and the modulated signal component included in the reception output signal is taken out, and inputs to photodetectors 2 and 3 are controlled by optical control elements or the like and gains of photodetectors 2 and 3 and the gain or the phase of an amplifier are controlled by outputs in a control circuit 5 so that the modulated signal component is minimum. Thus, the intensity noise due to the phase difference between the incident light from the optical coupler 1 to the photodetector 2 and that to the photodetector 3, the difference of frequency characteristic between photodetectors 2 and 3, the difference of frequency characteristic of the gain or the like of the amplifier, or the like is automatically suppressed. The variance of characteristics in each part due to secular change, temperature change, or the like is compensated to perform stable coherent optical communication.

4. 发明专利

JPS6223693A EYE CONTACT TELEVISION 失效
公开(公告)号：JPS6223693A
公开(公告)日：1987-01-31
申请号：JP16196785
申请日：1985-07-24
申请人： FUJITSU LTD
发明人： ASAMI TOSHIHIRO , KUWABARA HIDEO , NAKAJO TAKAFUMI
IPC分类号： H04N7/14 , H04N5/222
摘要： PURPOSE:To photograph a person to be photographed without diverting the eye line of the person to be photographed observing a display device by arranging the display device at the center of a lens of a video camera. CONSTITUTION:A convex lens 11 removing a part shown in dotted lines 11' to leave the peripheral part only and a detector 13 constitute the video camera 15 and the display device 14 is arranged at the missing part of the lens 11 so that the center is made coincident with an optical axis 16 of the lens. Through the constitution above, the image of the person 17 to be photographed is formed on the detector 13 by the lens 11. When the person 17 to be photographed observes a display plane 14' of the display device 14, the detector 13 picks photographs the person 17 as if the person 17 views the lens of the video camera 15. Since neither full mirror nor half mirror is require on the front face of the lens, miniaturization is attained.

5. 发明专利

JPS61209408A PHOTODETECTOR STRUCTURE 失效
公开(公告)号：JPS61209408A
公开(公告)日：1986-09-17
申请号：JP5100185
申请日：1985-03-14
申请人： FUJITSU LTD
发明人： KUWABARA HIDEO
IPC分类号： G02B6/42
摘要： PURPOSE:To facilitate the processing of a window member and to reduce the distortion of an analog signal wave by loading the window member, which is made of a birefringence crystal, segmented by tilting a crystal axis and has parallel incident and coming-out surfaces, on the window hole part of a housing. CONSTITUTION:The window member 18 is made of the birefringence crystal (for instance, sapphire) in a circular shape (for instance, 0.2mm in thickness and 2-3mm in outer diameter), has the parallel incident and coming-out surfaces 18a and 18b, and is segmented by tilting it to the crystal axis C. The analog signal wave coming out of an optical fiber 9 is projected on a photodetector 10 loaded by the window member 18 approximately vertical against the incident surface 18a of the window member 18. However,the most part of the light beams makes incident on the window member 18 as an abnormal light beam, refracted at an abnormal refracting factor and projected obliquely on the coming-out surface 18b. Then they are refracted on the coming-out surface 18b, shifted in parallel to the incident light beam, and make incident on the incident surface of a photodetector 3 almost vertically. Thus even if the analog signal wave whose wavelength fluctuates is projected on the photodetector 10, the transmissivity of the window member 18 hardly changes, and the distortion of the analog signal wave is less.

6. 发明专利

JPS6148081A Ic card 失效
标题翻译： IC卡
公开(公告)号：JPS6148081A
公开(公告)日：1986-03-08
申请号：JP16877084
申请日：1984-08-14
申请人： Fujitsu Ltd
发明人： KUWABARA HIDEO , MURANO KAZUO , NAKAJO TAKAFUMI
IPC分类号： B42D15/10 , G06K7/10 , G06K19/07 , G07C9/00
CPC分类号： G06K7/1097 , G06K19/0723 , G07C9/00111
摘要： PURPOSE:To obtain an IC card with high reliability by supplying a power for driving a circuit in a card and giving and taking data between a card and an externl processor through light in all. CONSTITUTION:An IC microprocessor and an internal circuit 1 including a memory are built in a card A, and a photovoltaic element 2 with comparatively large areas, a light emission element 3 and a light receiving element 4 are installed on a card surface. To an external processor B, when the card A is inserted to the card inserting part of the card using a terminal equipment, a light source 5 emitting a strong light is installed at the position corresponding to the photovoltaic element 2, voltage is generated at the photovoltaic element 2 by the outgoing light and electric power for drive is supplied to the internal circuit 1. Data outputted from the internal circuit 1 of the card A are converted from an electric signal to a light signal by a light emission element 7, is incident to a light receiving element 6, converted to the electric signal again, inputted to a circuit 8, and adversely, the data outputted from the circuit 8 are inputted by a light emission element 7 through the light receiving element 4 to the internal circuit 1. Thus, since the data are given and taken by using light in all, occurrence of a trouble due to faulty contact of electric connecting points as conventionally can be completely dissolved.
摘要翻译：目的：通过提供驱动卡片电路的电源以及通过光线在卡和外部处理器之间提供和获取数据，从而获得高可靠性的IC卡。构成：将IC微处理器和包括存储器的内部电路1内置在卡A中，并且具有较大面积的光电元件2，发光元件3和光接收元件4安装在卡表面上。对于外部处理器B，当使用终端设备将卡A插入到卡的卡插入部分时，发出强光的光源5安装在与光电元件2相对应的位置处，在通过输出光的光电元件2和用于驱动的电力被提供给内部电路1.从卡A的内部电路1输出的数据由发光元件7从电信号转换为光信号，入射到光接收元件6，再次转换为电信号，输入到电路8，不利地，由电路8输出的数据通过光接收元件4通过光接收元件4输入到内部电路1。因此，由于通过使用光来给出数据，所以由于电连接点的故障接触导致的故障的发生可以完全溶解。

7. 发明专利

JPS60238813A OPTICAL ISOLATOR 失效
公开(公告)号：JPS60238813A
公开(公告)日：1985-11-27
申请号：JP9418984
申请日：1984-05-11
申请人： FUJITSU LTD
发明人： ONODA YOSHITO , KUWABARA HIDEO , GOTOU MASAMI
IPC分类号： G02F1/09 , G02B27/28
摘要： PURPOSE:To avoid an influence of reflected feedback light of an optical isolator by placing a Faraday rotor whose surface crossing an optical axis is inclined to the optical axis, between two polarizers whose optical axes are inclined by 40 deg. to each other, and inclining the incident and emitting surface of the polarizer to the optical axis. CONSTITUTION:The first polarizing prism P1, a Faraday rotor FR, and the second polarizing prism whose optical axis is inclined by 45 deg. to that of the first polarizing prism P1 are placed successively on the optical axis. The Faraday rotor FR is formed in a shape of an oblique pillar in which the surface crossing its optical axis is inclined to the optical axis, and the polarizing prisms P1, P2 are constituted so that the incident and emitting surface is inclined to the optical axis, and also the respective surfaces opposed to the Faraday rotor FR become parallel to the surface of the Faraday rotor FR. Spacers 21, 22 are provided between the polarizing prisms P1, P2 and the Faraday rotor FR.

8. 发明专利

JPS60179709A OPTICAL COUPLING DEVICE 失效
公开(公告)号：JPS60179709A
公开(公告)日：1985-09-13
申请号：JP3512784
申请日：1984-02-28
申请人： FUJITSU LTD
发明人： KUWABARA HIDEO , CHIKAMA TERUMI
IPC分类号： G02B6/42
摘要： PURPOSE:To prevent generation of interferential distortion and noise in transmitting signal light, by setting the interval between the laser light emitting surface of a semiconductor laser and the reflecting surface of the laser light to a specific length. CONSTITUTION:The interval L between the laser light emitting surface of a semiconductor laser and reflecting surface of the laser light is set so as to satisfy the formula I . An optical coupling section is composed of a semiconductor laser 15, laser light emitting surface 15a, active layer 15b, optical fiber 16, light receiving surface 16a, convergent lens 17, and front spherical section 18 of the optical fiber 16. The optical coupling device of this invention is formed by constituting the optical coupling section in the same way as applied to conventional ones and by positioning and fixing each section by means of well known fitting structures. The interval L is set to a value which satisfies the Formula I and, at the same time, the convergent lens 17 or front spherical part 18 having a focal length corresponding to the interval L is selected.

9. 发明专利

JPS6031409B2 失效
公开(公告)号：JPS6031409B2
公开(公告)日：1985-07-22
申请号：JP9807880
申请日：1980-07-17
申请人： FUJITSU LTD
发明人： KUWABARA HIDEO
IPC分类号： H04B10/516 , H01S3/10 , H01S5/00 , H04B10/00 , H04B10/61

10. 发明专利

JPS60117693A LIGHT FREQUENCY STABILIZING DEVICE 失效
公开(公告)号：JPS60117693A
公开(公告)日：1985-06-25
申请号：JP22433183
申请日：1983-11-30
申请人： FUJITSU LTD
发明人： KUWABARA HIDEO , CHIKAMA TERUMI
IPC分类号： H01S5/042 , H01S5/068 , H01S5/0687
摘要： PURPOSE:To obtain a light frequency stabilizing device which is operable with high accuracy in spite of the temperature fluctuation by a method wherein two FPEs are used indicating the plus and minus change rate for the temperature fluctuation. CONSTITUTION:The light LT1 from an FPE14 which has the light output according to the frequency fluctuation is applied to the first light detector (DET1)15, and is transformed to the first electric signal E1. Said signal E1 goes to an adder 17 through a comparator 16. In the meanwhile, the reflected light LT2 from a beam splitter 13 is received to the second light detector 18, and is transformed to the second electric signal E2 equivalent to the fluctuation component of the light output, and the output followed purely only to the fluctuation of the frequency by a comparator 16, is negative feedbacked to a laser 11. Besides, in this case, another one FPE31 which has the quality contrary to that of the FPE14 is inserted at the light path of the light LT2.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式