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    ELECTROMAGNETIC WAVE SHIELDING BODY
    41.
    发明专利
    ELECTROMAGNETIC WAVE SHIELDING BODY 失效

    公开(公告)号：JPH03112196A

    公开(公告)日：1991-05-13

    申请号：JP25108789

    申请日：1989-09-27

    Applicant: NEC CORP

    Inventor： HARADA TAKASHI ,  HATAKEYAMA KENICHI

    IPC: H05K9/00

    Abstract: PURPOSE:To improve shielding effect by coating a large number of arranged hollow opposing wall surfaces produced by combining plates of improved conductivity in grid shape with a required material. CONSTITUTION:Opposing wall surfaces of cavities 2 of a structured body 4 which is formed by a number of arranged cavities 2 which are produced by combining a metal plate 1 of improved conductivity in grid shape are coated with a sheet 3 made of a material of high permeability. Therefore, by reducing an opening area and increasing depth, shielding effect can be enhanced without extending the length of a waveguide path, thus further enhancing the shielding effect with the same opening area and depth.

    ELECTROMAGNETIC WAVE ABSORBER
    42.
    发明专利
    ELECTROMAGNETIC WAVE ABSORBER 失效

    公开(公告)号：JPH01179496A

    公开(公告)日：1989-07-17

    申请号：JP147688

    申请日：1988-01-06

    Applicant: NEC CORP

    Inventor： HARADA TAKASHI

    IPC: H05K9/00 ,  C08J9/00 ,  H01Q17/00

    Abstract: PURPOSE:To obtain an electromagnetic absorber excellent in resistance to breakage and deformation by a method wherein the edges and the top of a pyramid- shaped molded piece, which are easy to be deformed and broken, are substituted with a structural component formed of high molecular resin such as rubber, plastic, or the like as a main component. CONSTITUTION:A pyramid-shaped molded piece 1 containing electrical loss material is provided, where four edges and the top of the pyramid are substituted with structural components 2 and 3 formed of high molecular resin such as rubber, plastic, or the like. Then, an electromagnetic wave absorber composed of the molded pieces 1 as a main body is prevented from being deformed and broken. By these processes, an electromagnetic wave absorber hard to deform and break can be obtained.

    OBSERVING STATION DEVICE FOR TELEMETER SYSTEM
    43.
    发明专利
    OBSERVING STATION DEVICE FOR TELEMETER SYSTEM 失效

    公开(公告)号：JPH01144887A

    公开(公告)日：1989-06-07

    申请号：JP30521787

    申请日：1987-12-01

    Applicant: NEC CORP ,  NIPPON ELECTRIC ENG

    Inventor： TANAKA KAZUO ,  USHIKU KEIICHI ,  MIURA USHIO ,  HARADA TAKASHI

    IPC: H04Q9/00 ,  G08C15/06

    Abstract: PURPOSE:To eliminate the measuring time error of a measuring instrument by providing a timer section and an output section being a measuring timing means and outputting a reset signal of the measuring instrument given to the measuring instrument at the same period. CONSTITUTION:A reset signal of the measuring instrument is outputted through an output section 4 to a measuring instrument 2 at a time 00 min 07 sec for each hour retarded by a preset time based on a time signal for each hour from the time of a timer section 7. The measuring data to be reset is given always to an input section 3 and sent to a central station by the polling from a central station for, e.g., each hour via a transmission reception control section 5 and a modulator-demodulator section 6 and via a line. The polling is implemented at 00 min 30sec for each hour according to a call signal from the central station and an observing station sends th measuring data to a transmission station. Moreover, the central station adds a time synchronizing signal to only the call signal at, e.g., 00min 30sec for each hour to apply polling to the observing stations. The time synchronizing signal is outputted to the timer section 7 from the transmission reception control section 5 and then the time of the observing stations is synchronized with the time of the central station in terms of year/month/day/hour/minute/second.

    ESTIMATING DEVICE FOR OCCURRENCE OF GLITCH IN LOGIC CIRCUIT
    44.
    发明专利
    ESTIMATING DEVICE FOR OCCURRENCE OF GLITCH IN LOGIC CIRCUIT 失效

    公开(公告)号：JPS6483168A

    公开(公告)日：1989-03-28

    申请号：JP24215387

    申请日：1987-09-25

    Applicant: NEC CORP

    Inventor： HARADA TAKASHI

    IPC: G01R31/317 ,  G01R31/28 ,  G06F11/22 ,  G06F17/50 ,  H03K19/00 ,  H03K19/0175

    Abstract: PURPOSE:To enable the simple and high-speed estimation of the possibility of occurrence of glitch caused by a fine shift of the timing of signals in a logic circuit, by a method wherein input signals at two consecutive times in the logic circuit are computed by a bit and compared with each other. CONSTITUTION:A storage means M1 stores the content of each bit of an input signal at a time preceding to the present in a logic circuit, while a storage means M2 stores the content of each bit of an input signal at the present time in the logic circuit. An arithmetic means M3 executes computations of the content of each bit outputted from the storage means M1 and the content of each bit outputted from the storage means M2 corresponding to the function of the logic circuit. In other words, the arithmetic means M3 executes a computation of taking a logical sum for each bit and others. A comparing means M4 compares, by each bit, a bit string X0 being the result of computation by the arithmetic means M3 with a bit string Xs prepared beforehand corresponding to the function of the logic circuit, and when these strings coincide with each other, it outputs a signal G showing that there is a possibility of occurrence of glitch.

    Electromagnetic radiation analysis device, analysis method, and analysis program
    50.
    发明专利
    Electromagnetic radiation analysis device, analysis method, and analysis program 有权
    电磁辐射分析装置，分析方法和分析方案

    公开(公告)号：JP2008059464A

    公开(公告)日：2008-03-13

    申请号：JP2006237919

    申请日：2006-09-01

    Applicant: Nec Corp ,  日本電気株式会社

    Inventor： MORISHITA TAKESHI ,  KOBAYASHI NAOKI ,  HARADA TAKASHI

    IPC: G06F17/50 ,  H05K3/00

    Abstract: PROBLEM TO BE SOLVED: To precisely predict the amount of the electromagnetic radiation from a printed circuit board.
    SOLUTION: This electromagnetic radiation analysis device analyzes electromagnetic radiation of a printed circuit board and has a power source-ground system layout extraction part 3, which extracts layout of a power source-ground system from inputted layout information, edge part extraction part 4 and 5, which extract an edge part of the power source-ground system at the extracted layout; a power source-ground system voltage change calculation part 7, which calculates voltage change between ground plane and power source plane about the extracted power source-ground system edge part for each analysis frequencies, based on the value of the inputted power source current; a common-mode current calculating part 8, which calculates value of common mode current based on the calculated voltage change; and an electromagnetic radiation field intensity calculation part 9, which calculates the intensity of electromagnetic radiation field arising at the ground plane, based on the value of the common-mode current calculated.
    COPYRIGHT: (C)2008,JPO&INPIT

    Abstract translation: 要解决的问题：精确地预测来自印刷电路板的电磁辐射的量。 解决方案：该电磁辐射分析装置分析印刷电路板的电磁辐射，并具有电源 - 接地系统布局提取部分3，其从输入的布局信息中提取电源 - 地面系统的布局，边缘部分提取部分 4和5，在提取的布局中提取电源 - 接地系统的边缘部分; 电源 - 接地系统电压变化计算部分7，其基于所输入的电源电流的值，针对每个分析频率计算关于提取的电源 - 接地系统边缘部分的接地面和电源平面之间的电压变化; 共模电流计算部8，其基于计算出的电压变化来计算共模电流的值; 以及电磁辐射场强度计算部9，其基于计算出的共模电流的值来计算在地平面上产生的电磁辐射场的强度。 版权所有（C）2008，JPO＆INPIT

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