公开(公告)号：JPH05291785A

公开(公告)日：1993-11-05

申请号：JP11971192

申请日：1992-04-13

Applicant: NEC CORP ,  TODA KOGYO CORP ,  NEC ENVIRONMENT ENG LTD

Inventor： HATAKEYAMA KENICHI ,  YAMAMOTO SHIGEHISA ,  NAKAMURA TATSUYA ,  SHIMIZU SHIGEMI

IPC: B32B7/02 ,  H01F1/00 ,  H05K9/00

Abstract: PURPOSE:To improved wave absorbing characteristics as well as machining property, forming property, and execution property of an electric wave absorber utilizing ferrite. CONSTITUTION:In the title absorber, a magnetic layer 2 is provided on a metal layer 1 and further a dielectric layer 3 is laminated on it in one piece. The magnetic layer 2 consists of a multi-layer structure of first and second layers, which are 1-30mm thick and made of a mixture of resin and 90wt.% or more magnetic particles of 0.5mum-5mm in diameter, The first layer includes a soft magnetic material where the frequency dispersion of the real part of permeability is (1/omega) (n>=1), and the second layer includes a soft magnetic material where the frequency dispersion of the real part of permeability is (1/omega) (n

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

IPC: H05K9/00 ,  B32B3/24

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.

公开(公告)号：JPH0461773A

公开(公告)日：1992-02-27

申请号：JP17116990

申请日：1990-06-28

Applicant: NEC CORP

Inventor： NAGAFUJI TOSHIAKI ,  HATAKEYAMA KENICHI

Abstract: PURPOSE:To prevent a connector from floating at the time of soldering by fitting by pressure a pin or a rivet in an insert hole provided in a detent member, and putting in pressure attachment in a mounting hole provided in an object to be mounted while the detent member is widened. CONSTITUTION:To mount a connector 1 on a card 7, a detent member 4 is inserted in an insert hole 10 in a card mounting arm 3, and the detent member 4 protruding from the arm 3 is inserted in a mounting hole 8 in the card 7. A rivet 6 is fitted by pressure in a through hole 40 in the detent member 4, and in this provisionally detained state, soldering is performed by reflow, and then a rivet 6 is caulked to make regular detention. These two stages of detention pevent loosening or rattling of tone card 7 and connector 1.

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.

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

IPC: G01R29/10 ,  H04B17/00

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.

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.

公开(公告)号：JPS63205586A

公开(公告)日：1988-08-25

申请号：JP3820087

申请日：1987-02-20

Applicant: NEC CORP

Inventor： TSUTAOKA TAKANORI ,  HATAKEYAMA KENICHI

IPC: G01R33/10

Abstract: PURPOSE:To view the state of a magnetic field distribution formed in a narrow space like a slit by adding a hardening agent to magnetic liquid formed by dispersing particulates of ferrite, etc., adsorbing a surface-active agent in a solvent. CONSTITUTION:The hardening agent which solidifies a solvent is added to the magnetic liquid formed by dispersing particulates of ferrite, metal ferromagnetic body, etc., having the surface-active agent adsorbed on the surface to obtain a ferromagnetic material 2, which is injected into a slit type magnetic field space 1 through its opening 3. The injected ferromagnetic liquid material 2 has its interface deforming according to the distribution of the magnetic to form a spike-shaped pattern 8 on the surface. The solid body of the magnetic liquid material 2 is taken out of the space a hardening time later and the pattern 8 on its surface is observed to view the magnetic field distribution in the space.

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

IPC: H05K9/00 ,  H01Q17/00

公开(公告)号：JPS6134997A

公开(公告)日：1986-02-19

申请号：JP5044484

申请日：1984-03-16

Applicant: Nec Corp ,  Kansai Paint Co Ltd

Inventor： KOGURE HIDEO ,  ICHIKAWA MASAYOSHI ,  NAKAYA TOSHIKAZU ,  HATAKEYAMA KENICHI ,  INUI TETSUJI

IPC: H05K9/00 ,  H01Q17/00

公开(公告)号：JP2001024379A

公开(公告)日：2001-01-26

申请号：JP2000173050

申请日：2000-06-09

Applicant: NEC CORP ,  MIYAGI NIPPON DENKI KK

Inventor： HARADA TAKASHI ,  INOMATA MASAYUKI ,  HATAKEYAMA KENICHI ,  FUJIWARA NOBORU ,  MASUDA NORIO

IPC: H05K9/00

Abstract: PROBLEM TO BE SOLVED: To suppress electromagnetic waves from leaking from the opening of an enclosure, where cables or the like are penetrated. SOLUTION: At the opening of an enclosure 1, a structural body 10, that consists of two layers of a conductive layer 8 and a magnetic body layer 9 and has one or a plurality of openings 11, is provided. A space 7 is provided between the structural body 10 and the enclosure 1, so that cables or the like can be wound around the structure body 10. Also, since the conductive layer 8 is in improve conductive contact, it is at the same potential as that of the enclosure 1, the openings 11 provided at the conductive layer 8 practically become the opening of the enclosure 1.