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11. 发明专利

JPH08288685A ELECTROMAGNETIC SHIELDING MATERIAL 失效
公开(公告)号：JPH08288685A
公开(公告)日：1996-11-01
申请号：JP8583395
申请日：1995-04-12
申请人： NEC CORP , TOKIN CORP
发明人： HATAKEYAMA KENICHI , TOGAWA HITOSHI
IPC分类号： H05K9/00
摘要： PURPOSE: To provide electromagnetic shielding material wherein excellent shielding effect can be obtained in the range from a low frequency band to a frequency band higher than or equal to several GHz. CONSTITUTION: A conducting gasket 50 and radio wave absorbent 1 are linked with each other and sandwiched between metal plates 51 and 52. In a frequency band heigher than or equal to several GHz, the shielding characteristics of the gasket 50 decreases, and electromagnetic waves permeate the gasket 50. In this frequency band, the absorption coefficient of the radio wave absorbent 1 increases. As the result, the electromagnetic waves which have permeated the gasket 50 are almost absorbed by the radio wave absorbent 1.

12. 发明专利

JPH08250235A CABLE CONNECTOR 失效
公开(公告)号：JPH08250235A
公开(公告)日：1996-09-27
申请号：JP5546495
申请日：1995-03-15
申请人： NEC CORP , NEC TOHOKU LTD
发明人： TAKAHASHI WATARU , HATAKEYAMA KENICHI
IPC分类号： H01R12/70 , H01R12/71 , H01R12/72 , H01R12/79 , H01R23/68 , H01R9/07
摘要： PURPOSE: To enhance handling capability and contact reliability by installing a plurality of contacts, an insulator part, and a U-shaped holding part in which a projection for fixing to a printed circuit board and a projection for locking are formed. CONSTITUTION: A flat cable 201 is moved in the direction (an arrow A) parallel to a printed circuit board 301, a cable conductor 202 positioned at the tip of the flat cable 201 is set to a U-groove 106 held with the insulator part 101 to mechanically fix the tip for electrically connecting. A connector 100 fixed with the cable 201 is moved in the direction (an arrow B) vertical to the printed circuit board 301, and a pair of fixing projections 105 are fixed to holes 301a, 302b of the printed circuit board 301. Then, the connector 100 is slid in the direction (an arrow C) parallel to the printed circuit board 301, the connector 100 and the printed circuit board 301 are mechanically fixed, and a contact part 107 of a contact 102 is brought into strong contact with a pad part 303.

13. 发明专利

JPH08186394A ELECTROMAGNETIC WAVE SCREENING BREATHING HOLE 失效
公开(公告)号：JPH08186394A
公开(公告)日：1996-07-16
申请号：JP33787794
申请日：1994-12-27
申请人： NEC CORP , TOKIN CORP
发明人： HATAKEYAMA KENICHI , TOGAWA HITOSHI
IPC分类号： F24F7/04 , H05K9/00
摘要： PURPOSE: To provide an electromagnetic wave screening breathing hole used for an electric dark room and an electromagnetic screening room for screening electromagnetic waves within a wide band from a low frequency to a mm-wave region. CONSTITUTION: In an electromagnetic wave screening breathing hole, a honeycomb screening material is provided in the entrance of the breathing hole and a pyramid or wedge-shaped electric wave absorbing material is fitted to the inner wall of the breathing hole. In the electric wave absorber, the view up to an exit is closed since the section entire region of the breathing hole is hidden by either absorbing body when viewed from the entrance surface of the breathing hole, and the installation position of the electric wave absorber is shifted in the depth direction of the breathing hole to secure the circulation of air. A length L of the breathing hole for fitting the electric wave absorbing body should be 2-3 wavelengths or longer. With this structure, an improved screening property can be achieved within a wide frequency range from a low frequency region to a mm-wave region.

14. 发明专利

JPH08160076A JIG AND METHOD FOR MEASURING ELECTRIC CURRENT 失效
公开(公告)号：JPH08160076A
公开(公告)日：1996-06-21
申请号：JP32129194
申请日：1994-11-30
申请人： NEC CORP
发明人： MASUDA KOICHIRO , TSUKAGOSHI TSUNEO , HATAKEYAMA KENICHI
IPC分类号： G01R15/18 , G01R1/24 , G01R19/00 , G01R29/00 , G01R29/08
摘要： PURPOSE: To measure in electric current flowing in a cable without receiving any influence from standing waves by fixing a current probe to one spot. CONSTITUTION: A cylindrical magnetic material 3 is provided in a metallic circular pipe 2 and the pipe 2 is positioned above the center of a metallic plate 4. The pipe 2 and plate 4 are electrically connected to each other at the shortest distance through a metallic supporting stand 5. Since a flow-in current Iin and reflected current Ir are attenuated while the currents flow through a jig, the flowing quantity Irt of the reflected current Ir can be made smaller as compared with that of the flow-in current Iin . Therefore, by only fixing a current probe 30 to a measuring position A, only the current Iin flowing in from a current source 13 can be measured.

15. 发明专利

JPH04116999A ELECTROMAGNETIC SHIELDING ENCLOSURE 失效
公开(公告)号：JPH04116999A
公开(公告)日：1992-04-17
申请号：JP23743990
申请日：1990-09-07
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： HARADA TAKASHI , INOMATA MASAYUKI , HATAKEYAMA KENICHI , FUJIWARA NOBORU , MASUDA NORIO
IPC分类号： H05K9/00
摘要： PURPOSE:To obtain a high-electromagnetic-shielding-ability enclosure by fixing a magnetic material to the cord drawing openings of the electrical and electronic equipment mounting enclosure. CONSTITUTION:A magnetic material 3 is fixed to the outside of an enclosure. An unnecessary electromagnetic wave leaking to the outside of the enclosure through its openings 2 is reflected by a common mode choke including the magnetic material 3, a cable, and a code, therefore, it is not radiated to the outside. The area of the openings is preferably small to enhance the leakage suppression effect. The magnetic material 3 can be removed from the openings of the enclosure and divided into a plurality of pieces to divide the openings, therefore, the cable and cord can be passed through the openings even if the openings are smaller than a connector and a socket.

16. 发明专利

JPH03112196A 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
申请人： NEC CORP
发明人： HARADA TAKASHI , HATAKEYAMA KENICHI
IPC分类号： H05K9/00
摘要： 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.

17. 发明专利

JPH02250397A ELECTROMAGNETIC SHIELDING MATERIAL 失效
公开(公告)号：JPH02250397A
公开(公告)日：1990-10-08
申请号：JP7212389
申请日：1989-03-23
申请人： NEC CORP
发明人： HATAKEYAMA KENICHI , SAWATO EIKICHI
IPC分类号： H05K9/00
摘要： PURPOSE:To shield an electromagnetic wave which leaks out of a clearance section of a box body by providing a board of metal box body with a magnetic substance whose permeability has an incline which increases from an outer side of the box body toward an inner side thereof. CONSTITUTION:A metal box body board A which covers a metal box body B is provided with a magnetic substance D whose permeability has an incline which increases from an outer side of the box body toward an inner side thereof. Therefore, if a ratio of space occupied by the magnetic substance D is made larger inside the box body in correspondence with the clearance of an overlapped section C, the gradient of permeability at the clearance section can be acquired equivalently. As for an influence of the gradient of permeability concerning prevention of leakage from the clearance, strictly speaking, a propagation equation should be derived from the Maxwell's equations in a state where the permeability mu is a function of the position; however, it can be qualitatively explained by that the propagation velocity (v) is in inversely proportion to sq. rt. mu. Thereby, leakage of an electromagnetic wave from the clearance section of the box body can be restrained.

18. 发明专利

JPS63194400A ELECTROMAGNETIC SHIELDING MATERIAL 失效
公开(公告)号：JPS63194400A
公开(公告)日：1988-08-11
申请号：JP2664387
申请日：1987-02-06
申请人： NEC CORP
发明人： HATAKEYAMA KENICHI , INUI TETSUJI
IPC分类号： H05K9/00

19. 发明专利

JPS63168093A WAVE ABSORBER 失效
公开(公告)号：JPS63168093A
公开(公告)日：1988-07-12
申请号：JP31182986
申请日：1986-12-29
申请人： NEC CORP
发明人： INUI TETSUJI , HATAKEYAMA KENICHI , YOSHIUCHI AKIRA
IPC分类号： H05K9/00 , H01Q17/00

20. 发明专利

JPS6314498A ELECTRIC WAVE ABSORBER 失效
公开(公告)号：JPS6314498A
公开(公告)日：1988-01-21
申请号：JP15824386
申请日：1986-07-04
申请人： NEC CORP
发明人： HARADA TAKASHI , HATAKEYAMA KENICHI
IPC分类号： H05K9/00

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