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公开(公告)号：JPH0743409A
公开(公告)日：1995-02-14
申请号：JP33027693
申请日：1993-12-27
Applicant: NEC CORP
Inventor： HANKOU EIJI , HARADA TAKASHI
Abstract: PURPOSE:To provide a radiowave endurance tester and evaluation method which is compact while eliminating special electromagnetic environment equipment such as radiowave dark chamber by enabling the specifying of a disturbed area easily as caused by the interference of radiowave noises while allowing objective evaluation. CONSTITUTION:A radiowave irradiation section 1 containing radiation probes 11A and 11B is provided to irradiate a set area of one main surface of an apparatus 6 to be measured with radiowaves for testing being concentrated thereon, a transmitter 2 to supply a high frequency power to the radiowave irradiation section 1 corresponding to the radiowave for testing. A judging device 3 is provided to calculate radiowave endurance as the degree of effect on an output signal O by the irradiation with the radiowave for testing by an arithmetic processing of the output signal O of the apparatus 6 to be measured and a display device 4 to visualize and display the radiowave endurance calculated.
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公开(公告)号：JPH06112682A
公开(公告)日：1994-04-22
申请号：JP25786092
申请日：1992-09-28
Applicant: NEC CORP , MIYAGI NIPPON DENKI KK
Inventor： MASUDA NORIO , HARADA TAKASHI , INOMATA MASAYUKI
IPC: H05K9/00
Abstract: PURPOSE:To provide an electromagnetic shield case for preventing the inward and outward leakage of electromagnetic waves by burying at least one line of magnetic bodies in a bent part of a conductor board. CONSTITUTION:A circuit board 1 is fastened by means of a guide rail 5 installed on a main body of a case 4. The circuit board 1 is provided with a conductor board 3 which covers an opening 6 after the circuit board 1 is inserted and fastened in the main body of a case 4. Both ends of the conductor board 3 are bent at right angles and one end is connected to the circuit board 1 and other end is further processed to a longitudinal recess. In that recess, a line of magnetic bodies 2 is inserted. For the magnetic bodies 2, ferrite sintered bodies or rubber ferrite magnetic bodies are used. A shielding effect depends on a permeability of the magnetic bodies 2. The higher permeability of the magnetic bodies, the better. When the magnetic bodies 2 have the same cross section, a shielding effect can be increased by arranging a plurality of lines of the magnetic bodies having a small cross sectional area.
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公开(公告)号：JPH04317399A
公开(公告)日：1992-11-09
申请号：JP11105491
申请日：1991-04-16
Applicant: NEC CORP
Inventor： HARADA TAKASHI
IPC: H05K9/00
Abstract: PURPOSE:To obtain a sufficient shielding effect for leakage of an electromagnetic wave for use in a seam of a metal housing or a periphery of a door. CONSTITUTION:One row or a plurality of rows of grooves are formed partly on a contact part with a conductor in a conductive shielding material 3 having an elasticity for suppressing leakage of an electrostatic field in contact with the conductor, and a rodlike magnetic element 2 is so buried integrated as to coincide with the groove. Since the part fill with the element 2 is increased in its surface impedance, a high frequency current to be leaked from the contact surface can be suppressed.
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公开(公告)号：JPH04117000A
公开(公告)日：1992-04-17
申请号：JP23739190
申请日：1990-09-07
Applicant: NEC CORP
Inventor： HARADA TAKASHI , HATAKEYAMA KENICHI
Abstract: PURPOSE:To suppress, over a wide frequency band, leakage of an unnecessary electromagnetic wave through a gap in a metallic cabinet by weaving linear conductors through magnetic material rows perpendicularly thereto into conductor bands of the specified width arranged at the specified distances. CONSTITUTION:Linear magnetic materials 1 are arranged parallel and a plurality of linear conductors 2 are woven through the magnetic materials perpendicularly thereto into conductors 3. The conductors 3 are arranged at appropriate distances to make an electromagnetic shield 4. Conductive contact across a gap in the joint of a metallic cabinet is maintained and a plurality of short gaps are virtually made by inserting the electromagnetic shield 4 in the gap. Therefore, a shielding characteristic is improved over a wide frequency band.
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公开(公告)号：JPH0410499A
公开(公告)日：1992-01-14
申请号：JP23744090
申请日：1990-09-07
Applicant: NEC CORP , MIYAGI NIPPON DENKI KK
Inventor： FUJIWARA NOBORU , MASUDA NORIO , INOMATA MASAYUKI , HARADA TAKASHI , HATAKEYAMA KENICHI
IPC: H05K9/00
Abstract: PURPOSE:To obtain an electromagnetic shield which can be used on a coated plane and does not necessitate special mechanism for strengthening contact by alternately aligning a magnetic body and a conductor as the electromagnetic shield for suppressing the leakage of electromagnetic wave from the contact part of a metal case and around a door of the metal case. CONSTITUTION:An electromagnetic shield 1 is obtained as a structure having rectangular cross-section by permitting the shield to have the combination of a bar conductor 2 which has an L-shaped cross section and a bar magnetic body 3 whose cross-section corresponding to the L-shaped recessed part 2a of the conductor 2 is rectangular and by incorporating the rectangular bar magnetic body 3 with the L-shaped recessed part 2a of the bar conductor 2. When the electromagnetic shield 1 is applied on the joint of a metal case, space is provided between two conductors 4 and 4 which compose the metal case and the electromagnetic shield 1 is arranged in the space. When NiZn sintered ferrite having a cross section whose width is 5mm and the thickness 3mm is used for the magnetic body 3, 25dB for one electromagnetic shield and 35dB for two electromagnetic shields are obtained as leakage suppressing effect for the electromagnetic shield 1 whose cross-sectional dimensions are 5mm in width and 3mm in thickness at 10MHz.
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Patent Agency Ranking
公开(公告)号：JPH0345034A
公开(公告)日：1991-02-26
申请号：JP18171289
申请日：1989-07-13
Applicant: NEC CORP , TOKIN CORP
Inventor： HARADA TAKASHI , TOGAWA HITOSHI , HATAKEYAMA KENICHI
Abstract: PURPOSE:To measure the characteristics of a radio wave absorber at a wider frequency band by constituting the jig of a shield type strip line comprising an outer conductor whose cross section is rectangular and an inner conductor, substantially a strip conductor, which is composed of an inner conductor with a planer strip conductor and a strip conductor orthogonal thereto. CONSTITUTION:An inner conductor is formed of a planer strip conductor and a strip conductor or plural strip conductors with the same width orthogonal thereto. For example, the inner size of the outer conductor 1 is square whose side is 1.22mm and the strip conductor 2 is formed with conductor plates whose thickness is 0.3mm and whose width is 1m orthogonal in the middle. Areas formed by faces of the strip conductors 2 orthogonal to each other and wall faces of the outer conductor are square. That is, other strip conductor is provided to the center of the wide strip conductor orthogonal to each other to suppress the TE10 mode. Thus, the measurement at the frequency band in which the TE10 mode is propagated is attained and the upper limit frequency in the measurement can be set higher.
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公开(公告)号：JPH02250398A
公开(公告)日：1990-10-08
申请号：JP7210289
申请日：1989-03-23
Applicant: NEC CORP
Inventor： HARADA TAKASHI , HATAKEYAMA KENICHI
IPC: H05K9/00
Abstract: PURPOSE:To easily manufacture a good ratio wave absorber of oblique incidence characteristic by reducing a dielectric loss of each layer of a lamination body of a plurality of layers whose appearance forms a wedge or a quadrangular pyramid, gradually from a lower layer to an upper layer. CONSTITUTION:A dielectric loss of each layer of a lamination body of a plurality of layers 1, 2, 3 whose appearance forms a wedge or a square pyramid, is reduced gradually from a lower layer 1 to an upper layer 3. In order to acquire a good radio wave absorption characteristic in oblique incidence, a distribution of dielectric loss in direction of height of an absorber should just change in exponential function; therefore, a loss and a height of each layer are adjusted to acquire a loss distribution of exponential function equivalently. Thereby, it is possible to acquire a good absorption characteristic even against oblique incidence of 30 deg. to 60 deg. and to realize relatively easy manufacture compared with other oblique incidence radio wave obsorbers.
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公开(公告)号：JPH01248699A
公开(公告)日：1989-10-04
申请号：JP7945088
申请日：1988-03-30
Applicant: NEC CORP
Inventor： HARADA TAKASHI
Abstract: PURPOSE:To shield, from an electromagnetic wave effectively an opening section for a cable to pass by superposing beltlike conductive rubbers so that each side face of the conductive rubbers is brought into contact with each other and the directions of array of each pair of the conductive rubbers are made to differ respectively. CONSTITUTION:Sheets A, B in which beltlike conductive rubbers 1 are arrayed so that each side face is brought into contact mutually without clearances have a function as an electromagnetic-wave shielding material because separate conductive rubber is brought into contact with mutually adjacent conductive rubbers and equipotential is kept as a whole. When cables 5 are penetrated through the contacting sections 2 of the conductive rubbers, clearances are generated along contacting sides. Since superposing structure in which the directions of arrangement of the conductive rubbers 1 of pairs A, B of plural pairs of sheets are made to differ mutually is formed, however, the clearances generated by the penetration of the cables is limited to the extremely slight sections of the peripheries of the cables. Accordingly, the deterioration of an electromagnetic-wave shielding effect is inhibited minimally.
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公开(公告)号：JPS63204799A
公开(公告)日：1988-08-24
申请号：JP3819987
申请日：1987-02-20
Applicant: NEC CORP
Inventor： HARADA TAKASHI , INUI TETSUJI
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公开(公告)号：JPS6188599A
公开(公告)日：1986-05-06
申请号：JP21073784
申请日：1984-10-08
Applicant: Nec Corp
Inventor： HATAKEYAMA KENICHI , HARADA TAKASHI , INUI TETSUJI
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