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1. 发明专利

JPH03114330A LOOP TRANSMISSION SYSTEM 失效
公开(公告)号：JPH03114330A
公开(公告)日：1991-05-15
申请号：JP25053389
申请日：1989-09-28
申请人： HITACHI LTD , HITACHI CABLE
发明人： SUGIMOTO NORIHIKO , YONEDA KATSUHIKO , OKADA MASAKAZU , TOMIZAWA HIROSHI , OGAWA HISAO , MURAMOTO TORU , YASUMOTO SEIICHI , KOYAMA YUKIO
IPC分类号： H04L12/42
摘要： PURPOSE:To inhibit the reception of a cyclic data due to transmission abnormality by providing a channel header to revise decision. CONSTITUTION:Each of channels C1-Cl constituting a frame transmitted on a transmission line is constituted of a channel header CH and an information part I, and the channel header CH includes a parity bit P, a station identification code D, a monitoring bit M and an information valid bit V. Then a reception station decides normality of the information part from the content of the channel header CH set by a transmission station and the information valid bit V is revised into a reset state in case of the abnormal data. Thus, the circulation data due to transmission abnormality is not received.

2. 发明专利

JPH05142450A WDM MODULE FOR BI-DIRECTIONAL OPTICAL TRANSMISSION 失效
公开(公告)号：JPH05142450A
公开(公告)日：1993-06-11
申请号：JP30636291
申请日：1991-11-21
申请人： HITACHI CABLE , HITACHI LTD
发明人： UETSUKA NAOTO , KUROSAWA MASAAKI , KUSUYAMA HIROYUKI , AOKI SATOSHI , IMOTO KATSUYUKI , KOYAMA YUKIO
IPC分类号： G02B6/122 , G02B6/12 , G02B6/28 , G02B6/293 , G02B6/42 , H01L31/0232 , H01S5/00 , H04B10/25 , H04B10/2507
摘要： PURPOSE:To obtain the WDM module for bi-directional optical transmission which is small in size and enables high-speed modulation and has small crosstalk. CONSTITUTION:A module consists of a semiconductor laser 4 and a photodetecting element 9 for two directional couplers 11 and lambda1 consisting of thin film waveguides formed on a waveguide substrate 8. The sent signal from the laser 4 which has wavelength An is outputted to a fiber 17 from a slantingly cut end surface of the substrate 8 through a waveguide 12 which selectively transmits the signal with the wavelength lambda1. A received signal wave having wavelength lambda2 is made incident on the directional coupler 11, passed through a waveguide 13 which selectively transmits the lambda2 and reflected by a wavelength selective reflecting film 19 on the end surface of the substrate 8 which transmits the lambda1 and reflects the lambda2, and detected by the photodetecting element 20 through the waveguide 14 of the directional coupler 18. Return light from the fiber which has the wavelength lambda1 is cut off because of the wavelength selectivity of the waveguide 13 and reflecting film 19 and the photodetecting element removes stray light by a pinhole, so the crosstalk is small. Further, the return light with the lambda1 is reflected by the slanting surfaces of the slanting end surface 8a of substrate and a lens 7 and does not return to the laser.

3. 发明专利

JPS51115656A STRUCTURE OF CONNECTED PRINTED SUBSTRATE AND CONNECTOR 失效
公开(公告)号：JPS51115656A
公开(公告)日：1976-10-12
申请号：JP4053375
申请日：1975-04-03
申请人： HITACHI CABLE
发明人： ITOU YOSHIKI , KONDOU ISAO , KOYAMA YUKIO
IPC分类号： H05K1/11 , H01R13/00 , H01R13/64

4. 发明专利

JPH01152886A CATV SIGNAL TRANSMISSION METHOD 失效
公开(公告)号：JPH01152886A
公开(公告)日：1989-06-15
申请号：JP31303387
申请日：1987-12-10
申请人： JAPAN BROADCASTING CORP , HITACHI CABLE
发明人： MIYAZAWA HIROSHI , ONO YOSHIKI , KOYAMA YUKIO , BESSHO NORIHIRO , SUZUKI SHOICHI , YAMAURA HARUAKI
IPC分类号： H04N7/16
摘要： PURPOSE:To send satellite broadcast with high quality over a wide area with simple method by converting a satellite broadcast electric signal from a satellite broadcast antenna into an optical signal, sending the optical signal to the midpoint of the CATV system, branching it and converting the one into an electric signal to send it to the reception terminal and to send the other to the midpoint. CONSTITUTION:A radio wave received by a satellite broadcast antenna 1 is converted into a BS-IF electric signal in 1-1.3CHz from 12GHz band and sent to an optical transmitter 3 through a coaxial cable 2 while being kept in an FM signal. The BS-IF electric signal is converted into a BS-IF optical signal in the optical transmitter 3 and sent to a position (a) where a trunk line distribution amplifier TDA 10 of the CATV system exists through an optical transmission line 4. The optical branch device 5 is installed to the position (a), one of the branched optical signal is converted into an electric signal by an optical receiver 6 and the other is sent to a position (b) where the next TDA 10 exist via the optical transmission line 4. Thus, the transmission by the electric signal is limited to a narrow range near the reception terminal, then the satellite broadcast with high quality is sent to a wide area.

5. 发明专利

JPS58121843A SIGNAL TRANSMISSION SYSTEM WITH OPTICAL FIBER 失效
公开(公告)号：JPS58121843A
公开(公告)日：1983-07-20
申请号：JP422082
申请日：1982-01-14
申请人： HITACHI CABLE
发明人： KOYAMA YUKIO , ASAI TAKAHIRO
IPC分类号： H04B10/2507 , H04B1/10 , H04B10/07 , H04B15/00
摘要： PURPOSE:To obtain signals with high quality, by providing a means controlling the gain of a variable gain amplifier with an output of a differential amplifier, and obtaining a signal being reduced interference noise component from the amplifier. CONSTITUTION:An output signal of a photo diode 9 is led to a branching filter 12, an output from an output terminal 12 of the filter 12 is led to the variable gain amplifier 17, the output from an output terminal 14 of the filter 12 is led to the differential amplifier 16 to a reference terminal 15 of which a positive level DC voltage is applied, and the output of the amplifier 16 is given to a gain control input terminal 18 of the amplifier 17. That is, the degree of interference caused in the transmission system is detected by checking the component around DC of the reception signal and the disturbance of transmission signals is corrected by using this method.

6. 发明专利

JPS5724903A Forming method for inclined end surface of optical fiber 失效
标题翻译：光纤光纤终端表面形成方法
公开(公告)号：JPS5724903A
公开(公告)日：1982-02-09
申请号：JP10083880
申请日：1980-07-23
申请人： Hitachi Cable Ltd
发明人： SHIMADA TAKASHI , KOYAMA YUKIO , YAMAGUCHI HIDEO
IPC分类号： G02B6/00 , B26D3/08 , C03B37/16 , G02B6/25
CPC分类号： G02B6/25
摘要： PURPOSE:To obtain a smooth inclined end surface by applying flaws at a position where bending stress of an optical fiber was produced. CONSTITUTION:By supporting an optical fiber 1 with a pair of clamps 2a, 2b, tensile stress and torque are given, and by bending the central part along a convex surface of a jig 3, at this part bending stress is produced. When with this state a maximum part of bending stress is pressurized with a diamond cutter 4, etc., and the part is scraped, stress rupture is produced and a smooth inclined end surface is obtained. An inclination angle at the inclined end surface changes with torque and bending stress. If torque is not applied, an end surface perpendicular to the center of the optical fiber 1 is obtained.
摘要翻译：目的：通过在产生光纤的弯曲应力的位置处施加缺陷来获得平滑的倾斜端面。构成：通过支撑具有一对夹具2a，2b的光纤1，提供拉伸应力和扭矩，并且通过沿着夹具3的凸形表面弯曲中心部分，在该部分产生弯曲应力。当用这种状态时，用金刚石切割器4等加压最大部分的弯曲应力，并且刮削该零件，产生应力破裂并获得平滑的倾斜端面。倾斜端面倾斜角随扭矩和弯曲应力而变化。如果不施加扭矩，则获得垂直于光纤1的中心的端面。

7. 发明专利

JPS5723370A Alarm system using community antenna televison circuit 失效
标题翻译：使用社区天线电视电路的报警系统
公开(公告)号：JPS5723370A
公开(公告)日：1982-02-06
申请号：JP9775280
申请日：1980-07-17
申请人： Hitachi Cable Ltd
发明人： IMAI MITSUO , KOYAMA YUKIO
IPC分类号： H04N7/16 , G08B25/08
CPC分类号： G08B25/085
摘要： PURPOSE:To prevent interference without increasing the number of repeaters, by placing a repeater in the vicinity of a distributor, placing a separator behind it, dividing an alarm signal from each subscriber's terminal, and inputting it to the repeater. CONSTITUTION:A signal separator 32 is provided before a signal is inputted to a signal distributor 33', so that an alarm signal is directly inputted to a repeater. Accordingly, an alarm signal from each subscriber's terminal corresponding to each circuit is not inputted to other circuit by the signal distributor 33', therefore, it is independent each other. In this way, each repeater 52 is able to divide subscriber's terminals in a group which said repeater controls, into a lot of groups.
摘要翻译：目的：为了防止干扰而不增加中继器的数量，通过在分配器附近放置一个中继器，在其后面放置分离器，将每个用户终端的报警信号分开，并将其输入到中继器。构成：在将信号输入到信号分配器33'之前提供信号分离器32，从而将报警信号直接输入到中继器。因此，来自每个用户终端对应于每个电路的报警信号不被信号分配器33'输入到其它电路，因此它彼此独立。以这种方式，每个中继器52能够将所述中继器控制的组中的用户终端分成许多组。

8. 发明专利

JPS5663694A ALARM SYSTEM USING CATV LINE 失效
公开(公告)号：JPS5663694A
公开(公告)日：1981-05-30
申请号：JP14013279
申请日：1979-10-30
申请人： HITACHI CABLE
发明人： KOYAMA YUKIO , IMAI MITSUO
IPC分类号： G08B25/00 , G08B23/00 , G08B26/00 , H04L12/40 , H04L12/403 , H04N7/10 , H04N7/16

9. 发明专利

JPS54111800A ALARM SYSTEM UTILIZING WIRE TELEVISION 失效
公开(公告)号：JPS54111800A
公开(公告)日：1979-09-01
申请号：JP1954978
申请日：1978-02-21
申请人： HITACHI CABLE
发明人： SUZUKI SHIYOUICHI , MASHITA CHIYASU , KOYAMA YUKIO
IPC分类号： G08B25/00 , G08B13/00 , G08B13/196 , G08B17/00 , G08B23/00 , G08B25/01 , G08B27/00 , H04N7/16
摘要： PURPOSE:To correctly catch the condition of the subscriber and to deliver the correct information to other subscribers, by receiving the audio from the microphone group at the subscribers taken place for emergency event at the center station. CONSTITUTION:The central station 1 is provided with the audio receiver 9, the subscriber terminal unit 14 is with the switch circuit 18, and the subscriber is provided with the microphone group 23 as additional unit newly. Further, if emergent event is taken place at a subscriber and either of the push button group 24 located is depressed, then the circuit 18 makes all the microphone group 23 into operation, stopping the speaker 17 for simultaneous broadcast at the subscriber, and the alarm signal delivery section 20 delivers the audio signal and the alarm signal from the microphone after modulating into a specific frequency. This signal is received with the audio receiver 9 at the central station 1, the content of failure at the subscriber is discriminated with audio, the condition is correctly catched, and the monitor information is broadcast to other subscribers at the same time except the subscriber depressing the button.

10. 发明专利

JPS5185617A 失效
公开(公告)号：JPS5185617A
公开(公告)日：1976-07-27
申请号：JP1109175
申请日：1975-01-27
申请人： HITACHI CABLE
发明人： OSHISHIBA KOICHI , KONDO ISAO , KOYAMA YUKIO , ITO YOSHIKI
IPC分类号： H04B5/00 , H04B7/26

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