• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a noise removing filter for removing the electromagnetic wave noise leaking from an electronic equipment to the outside via a connector throughhole through which a connector passes, the noise removing filter includes a magnetic member filled in a gap between a body of the electronic equipment and the connector to cover the circumference of the connector.
    公开号:US20010006363A1
    申请号:US09/742,134
    申请日:2000-12-22
    公开日:2001-07-05
    发明作者:Kunio Kawato
    申请人:NEC Corp；
    IPC主号:H05K9-0018
    专利说明:
    [0001] 1. Field of the Invention [0001]
    [0002] The present invention relates to an electronic apparatus such as a computer, and more particularly, to a noise removing filter for removing the electromagnetic wave noise leaking from the electronic equipment to the outside. [0002]
    [0003] 2. Description of the Related Art [0003]
    [0004] Generally, in a computer apparatus, the electromagnetic wave noise leaks from a computer apparatus to the outside via a cable throughhole, and also, conduction noise is generated from a cable. [0004]
    [0005] In order to suppress the above-mentioned electromagnetic wave noise and the conduction noise, a first prior art noise removing filter is constructed by a ferrite core wound on the cable and a copper foil tape filled in a gap between the ferrite core and the body of the computer apparatus. [0005]
    [0006] In the above-described first prior art noise removing filter, however, since the manufacturing steps for winding the ferrite core and filling the copper foil tape are necessary, the manufacturing cost is increased. [0006]
    [0007] A second prior art noise removing filter is constructed by an annular ferrite core having a throughhole through which a cable passes and an annular cover for fixing the annular ferrite core to a body of a computer apparatus (see JP-A-11-214941). [0007]
    [0008] In the above-described second prior art noise removing filter, however, it is difficult for the inner surface of the annular cover to be adapted to the outer surface of the annular ferrite core, which would increase the manufacturing cost. [0008]
    [0009] Also, the second prior art noise removing filter cannot be applied to an electronic equipment having a connector throughhole through which a connector passes. [0009] SUMMARY OF THE INVENTION
    [0010] It is an object of the present invention to provide a noise removing filter capable of decreasing the manufacturing cost. [0010]
    [0011] According to the present invention, in a noise removing filter for removing the electromagnetic wave noise leaking from an electronic equipment to the outside via a connector throughhole through which a connector passes, the noise removing filter includes a magnetic member filled in a gap between a body of the electronic equipment and the connector to cover the circumference of the connector. [0011] BRIEF DESCRIPTION OF THE DRAWINGS
    [0012] The present invention will be more clearly understood from the description set forth below, with reference to the accompanying drawings, wherein: [0012]
    [0013] FIGS. 1A and 1B are side views illustrating a first embodiment of the noise removing filter according to the present invention mounted on a computer apparatus; [0013]
    [0014] FIG. 2 is a perspective view of the noise removing filter of FIGS. 1A and 1B; [0014]
    [0015] FIG. 3 is a perspective view of a modification of the noise removing filter of FIG. 2; [0015]
    [0016] FIGS. 4A and 4B are side views illustrating a second embodiment of the noise removing filter according to the present invention mounted on a computer apparatus; and [0016]
    [0017] FIGS. 5A an [0017] 5B are side views illustrating a third embodiment of the noise removing filter according to the present invention mounted on a computer apparatus. DESCRIPTION OF THE PREFERRED EMBODIMENTS
    [0018] In FIGS. 1A and 1B, which illustrate a first embodiment of the present invention, reference numeral [0018] 1 designates a body of a computer apparatus (not shown) having an inner surface 1 a, an outer surface 1 b and a connector throughhole 1 c through which a connector jack 2 fixed to a computer board 3.
    [0019] In FIG. 1A, a noise removing filter [0019] 4 is filled in a gap between the body 1 and the connector jack 2 to cover the circumference of the connector jack 2. In this case, the noise removing filter 5 is mounted on the inner surface of the body 1 by a double-coated tape 4 a, to completely fill the throughhole 1 c.
    [0020] Note that the double-coated tape [0020] 4 a of FIGS. 1A and 1B can be replaced by bolts (not shown) inserted through the body 1 and the noise removing filter 4.
    [0021] In FIG. 1B, a user puts a connector plug [0021] 5 connected to a cable 6 into the connector jack 5 of FIG. 1A.
    [0022] As illustrated in FIG. 2, the noise removing filter [0022] 4 of FIGS. 1A and 1B is constructed by a magnetic core section 41 which is filled in the gap between the body 1 and the connector jack 2 and a magnetic core section 42 connected to the magnetic core section 51 mounted on the inner surface of the body 1. That is, the combination of the magnetic core sections 41 and 42 form a flange member with a rim mounted on the inner surface of the body 1.
    [0023] In FIG. 2, the magnetic core sections [0023] 41 and 42 are annular so as to be adapted to the shape of the throughhole 1 c, which is also annular.
    [0024] Note that, if the throughhole [0024] 1 c is square or rectangular, the noise removing filter of FIG. 2 is also square or rectangular as illustrated in FIG. 3.
    [0025] In FIGS. 4A and 4B, which illustrate a second embodiment of the present invention, the noise removing filter [0025] 4′, which is the same as the noise removing filter 4 of FIGS. 1A and 1B, is mounted on the outer surface 1 a of the body 1 by a double-coated tape 4′a, to completely fill the throughhole 1 c.
    [0026] Note that the double-coated tape [0026] 4′a of FIGS. 4A and 4B can be also replaced by bolts (not shown) inserted through the body 1 and the noise removing filter 4.
    [0027] In FIG. 4B, a user puts a connector plug [0027] 5 connected to a cable 6 into the connector jack 5 of FIG. 4A via the noise removing filter 4′.
    [0028] In FIGS. 5A and 5B, which illustrate a third embodiment of the present invention, the noise removing filter [0028] 5 is mounted on the inner surface 1 a of the body 1, and also, the noise removing filter 4′ is mounted on the outer surface 1 b of the body 1. Even in this case, the noise removing filters 4 and 4′ are mounted by double-coated tapes 4 a and 4′a, to completely fill the throughhole 1 c. The combination of the noise removing filters 4 and 4′ serve as one noise removing filter.
    [0029] Note that the double-coated tape [0029] 4′a of FIGS. 5A and 5B can be also replaced by bolts (not shown) inserted through the body 1 and the noise removing filter 4.
    [0030] In FIG. 5B, a user puts a connector plug [0030] 5 connected to a cable 6 into the connector jack 5 of FIG. 5A via the noise removing filter 4′.
    [0031] In the above-described embodiments, the noise removing filter can remove the electromagnetic wave noise from the computer apparatus (not shown) as well as the conduction noise generated from the cable [0031] 6.
    [0032] Also, the noise removing filter can be made of ferrite. [0032]
    [0033] As explained hereinabove, according to the present invention, since the adaptation of an annular cover to an annular ferrite core is unnecessary, the manufacturing cost can be reduced. [0033]
    权利要求:
    Claims (27)
    [1" id="US-20010006363-A1-CLM-00001] 1. A noise removing filter for removing the electromagnetic wave noise leaking from an electronic equipment to the outside via a connector throughhole through which a connector passes, said noise removing filter comprising a magnetic member filled in a gap between a body of said electronic equipment and said connector to cover the circumference of said connector.
    [2" id="US-20010006363-A1-CLM-00002] 2. The noise removing filter as set forth in
    claim 1 , wherein said magnetic member comprises:
    a first magnetic core mounted on a first surface of said body; and
    a second magnetic core mounted on said second surface of said body.
    [3" id="US-20010006363-A1-CLM-00003] 3. The noise removing filter as set forth in
    claim 2 , wherein said first and second magnetic cores are adapted to a shape of said connector.
    [4" id="US-20010006363-A1-CLM-00004] 4. The noise removing filter as set forth in
    claim 2 , wherein each of said first and second magnetic cores comprises:
    a first magnetic core section filled in the gap between said body and said connector; and
    a second magnetic core section connected to said first magnetic core section and mounted on one of the first and second surfaces of said body.
    [5" id="US-20010006363-A1-CLM-00005] 5. The noise removing filter as set forth in
    claim 4 , wherein said first and second magnetic core sections are made of ferrite.
    [6" id="US-20010006363-A1-CLM-00006] 6. The noise removing filter as set forth in
    claim 2 , wherein said first and second magnetic cores comprise a pair of flange members filled in the gap between said body and said connector, each of said flange members comprising a rim mounted on one of the first and second surfaces of said body.
    [7" id="US-20010006363-A1-CLM-00007] 7. The noise removing filter as set forth in
    claim 5 , wherein said flange members are made of ferrite.
    [8" id="US-20010006363-A1-CLM-00008] 8. The noise removing filter as set forth in
    claim 1 , wherein said connector comprises a jack and a plug through which a cable passes.
    [9" id="US-20010006363-A1-CLM-00009] 9. The noise removing filter as set forth in
    claim 1 , wherein said magnetic member comprises a single magnetic core mounted on a surface of said body.
    [10" id="US-20010006363-A1-CLM-00010] 10. The noise removing filter as set forth in
    claim 9 , wherein said single magnetic core is adapted to a shape of said connector.
    [11" id="US-20010006363-A1-CLM-00011] 11. The noise removing filter as set forth in
    claim 9 , wherein said single magnetic core comprises:
    a first magnetic core section filled in the gap between said body and said connector; and
    a second magnetic core section connected to said first magnetic core section and mounted on one of the first and second surfaces of said body.
    [12" id="US-20010006363-A1-CLM-00012] 12. The noise removing filter as set forth in
    claim 11 , wherein said first and second magnetic core sections are made of ferrite.
    [13" id="US-20010006363-A1-CLM-00013] 13. The noise removing filter as set forth in
    claim 9 , wherein said single magnetic core comprises a flange member filled in the gap between said body and said connector, said flange member comprising a rim mounted on a surface of said body.
    [14" id="US-20010006363-A1-CLM-00014] 14. The noise removing filter as set forth in
    claim 12 , wherein said flange member is made of ferrite.
    [15" id="US-20010006363-A1-CLM-00015] 15. An electronic apparatus comprising:
    a body having a connector throughhle;
    a connector jack passing through said connector throughhole; and
    a noise removing filter incouding a magnetic member filled in a gap between said body and said connector jack to cover the circumference of said connector jack.
    [16" id="US-20010006363-A1-CLM-00016] 16. The electronic apparatus as set forth in
    claim 15 , wherein said magnetic member comprises:
    a first magnetic core mounted on a first surface of said body; and
    a second magnetic core mounted on said second surface of said body.
    [17" id="US-20010006363-A1-CLM-00017] 17. The electronic apparatus as set forth in
    claim 17 , wherein said first and second magnetic cores are adapted to a shape of said connector jack.
    [18" id="US-20010006363-A1-CLM-00018] 18. The electronic apparatus as set forth in
    claim 17 , wherein each of said first and second magnetic cores comprises:
    a first magnetic core section filled in the gap between said body and said connector jack; and
    a second magnetic core section connected to said first magnetic core section and mounted on one of the first and second surfaces of said body.
    [19" id="US-20010006363-A1-CLM-00019] 19. The electronic apparatus as set forth in
    claim 18 , wherein said first and second magnetic core sections are made of ferrite.
    [20" id="US-20010006363-A1-CLM-00020] 20. The noise removing filter as set forth in
    claim 16 , wherein said first and second magnetic cores comprise a pair of flange members filled in the gap between said body and said connector, each of said flange members comprising a rim mounted on one of the first and second surfaces of said body.
    [21" id="US-20010006363-A1-CLM-00021] 21. The electronic apparatus as set forth in
    claim 19 , wherein said flange members are made of ferrite.
    [22" id="US-20010006363-A1-CLM-00022] 22. The electronic apparatus as set forth in
    claim 15 , wherein said magnetic member comprises a single magnetic core mounted on a surface of said body.
    [23" id="US-20010006363-A1-CLM-00023] 23. The electronic apparatus as set forth in
    claim 22 , wherein said single magnetic core is adapted to a shape of said connector.
    [24" id="US-20010006363-A1-CLM-00024] 24. The electronic apparatus as set forth in
    claim 22 , wherein said single magnetic core comprises:
    a first magnetic core section filled in the gap between said body and said connector jack; and
    a second magnetic core section connected to said first magnetic core section and mounted on one of the first and second surfaces of said body.
    [25" id="US-20010006363-A1-CLM-00025] 25. The electronic apparatus as set forth in
    claim 24 , wherein said first and second magnetic core sections are made of ferrite.
    [26" id="US-20010006363-A1-CLM-00026] 26. The electronic apparatus as set forth in
    claim 22 , wherein said single magnetic core comprises a flange member filled in the gap between said body and said connector jack, said flange member comprising a rim mounted on a surface of said body.
    [27" id="US-20010006363-A1-CLM-00027] 27. The electronic apparatus as set forth in
    claim 25 , wherein said flange member is made of ferrite.
    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    JP2001185891A|2001-07-06|
    US6529087B2|2003-03-04|
    JP3536757B2|2004-06-14|
    FR2803167A1|2001-06-29|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB2403072A|2003-06-12|2004-12-22|Aph Trading Pte Ltd|Electrical isolator|
    GB2479351A|2010-04-06|2011-10-12|Nanotesla Inst Ljubljana|Magnetically lossy cover for apertures through an electromagnetic shielding wall|
    US20160114691A1|2013-06-10|2016-04-28|Hitachi Automotive Systems, Ltd.|Power Conversion Device|JPH0220765Y2|1980-05-20|1990-06-06|||
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    US4761147A|1987-02-02|1988-08-02|I.G.G. Electronics Canada Inc.|Multipin connector with filtering|
    JPH01170306A|1987-12-23|1989-07-05|Matsushita Electric Ind Co Ltd|Connection port for conduit|
    JPH02115U|1988-06-14|1990-01-05|||
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    JPH0817279B2|1989-06-02|1996-02-21|北川工業株式会社|Shield material|
    JPH03224299A|1989-12-04|1991-10-03|Nikko Kogyo Kk|Bushing with noise filter|
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    JPH0537173A|1991-07-31|1993-02-12|Canon Inc|Electromagnetic wave preventing construction against electronic apparatuses|
    US5373277A|1991-08-07|1994-12-13|Mitsubishi Denki Kabushiki Kaisha|Signal discriminator|
    JPH0684635U|1993-05-13|1994-12-02|セイコーエプソン株式会社|Cable bush with built-in ferrite core|
    JP2912130B2|1993-08-18|1999-06-28|日本電気株式会社|Electromagnetic shielding structure for cable|
    JPH07161531A|1993-12-02|1995-06-23|Matsushita Electric Ind Co Ltd|Connector for lap top information processor|
    JP3021316B2|1995-03-07|2000-03-15|富士電気化学株式会社|Unwanted electromagnetic wave absorption structure of mobile phone|
    JPH0917646A|1995-06-28|1997-01-17|Tokin Corp|Bush, bush type magnetic core and noise filter using it|
    JP2688347B2|1996-04-09|1997-12-10|宇呂電子工業株式会社|Leakage radiation prevention element|
    US5969583A|1996-12-23|1999-10-19|Acuson Corporation|Common-mode EMI filter with a separately wound ground winding|
    JPH10275994A|1997-03-28|1998-10-13|Nec Corp|Core for emi countermeasure|
    JPH1117364A|1997-06-23|1999-01-22|Tokyo Gas Co Ltd|Seal structure for member|
    US6089917A|1997-10-24|2000-07-18|International Business Machines Corporation|Method and system for circuit board common mode noise suppression utilizing ferrous cores|
    JPH11135983A|1997-10-30|1999-05-21|Fujitsu Ltd|Electronic equipment improved in electromagnetic wave shielding property|
    JPH11214941A|1998-01-22|1999-08-06|Nec Corp|Noise filter|WO2007021542A2|2005-08-16|2007-02-22|Extreme Broadband Engineering, Llc|Power inserter module|
    JP5006140B2|2007-09-04|2012-08-22|日本航空電子工業株式会社|Connector and connector unit|
    JP6298974B2|2013-08-09|2018-03-28|北川工業株式会社|Output noise reduction device|
    JP6385260B2|2014-12-01|2018-09-05|ソニー・オリンパスメディカルソリューションズ株式会社|Connection structure and medical equipment|
    KR20200056207A|2018-11-14|2020-05-22|주식회사 엘지화학|Battery pack|
    法律状态:
    2000-12-22| AS| Assignment|Owner name: NEC CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KAWATO, KUNIO;REEL/FRAME:011419/0257 Effective date: 20001214 |
    2006-08-11| FPAY| Fee payment|Year of fee payment: 4 |
    2010-08-11| FPAY| Fee payment|Year of fee payment: 8 |
    2014-10-10| REMI| Maintenance fee reminder mailed|
    2015-03-04| LAPS| Lapse for failure to pay maintenance fees|
    2015-03-30| STCH| Information on status: patent discontinuation|Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
    2015-04-21| FP| Expired due to failure to pay maintenance fee|Effective date: 20150304 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP368426/1999||1999-12-24||
    JP36842699A|JP3536757B2|1999-12-24|1999-12-24|Mounting structure of noise reduction filter|
    JP11-368426||1999-12-24||
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