US20040069515A1 - Cabinet gasket providing panel adhesion and electromagnetic interference shielding - Google Patents
Cabinet gasket providing panel adhesion and electromagnetic interference shielding Download PDFInfo
- Publication number
- US20040069515A1 US20040069515A1 US10/272,240 US27224002A US2004069515A1 US 20040069515 A1 US20040069515 A1 US 20040069515A1 US 27224002 A US27224002 A US 27224002A US 2004069515 A1 US2004069515 A1 US 2004069515A1
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- US
- United States
- Prior art keywords
- fastener
- gasket
- panel
- opening
- strips
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0015—Gaskets or seals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S439/00—Electrical connectors
- Y10S439/927—Conductive gasket
Abstract
Description
- This invention relates to electromagnetic interference (EMI) shielding.
- The prior art contains myriad designs of EMI shielding gaskets for doors or access panels of cabinets for housing electrical or electronic equipment. Some designs, such as a woven conductive sheath applied over a strip of pliable foam material, or a strip of rubber impregnated with particles of conductive metal, provide a good seal against electromagnetic emissions through the space between the door or panel and the rest of the cabinet, sometimes even when the door or access panel warps. However, they require the use of a latching mechanism therewith to attach the door or panel to the cabinet and to keep it closed. The trouble of latching and unlatching the latching mechanism encourages service personnel to simply remove the door or panel and keep the cabinet open, thereby defeating the purpose of EMI shielding.
- Magnetic latches and gaskets, which rely upon magnetic attraction between a door or a panel and a cabinet, are also known. For example, U.S. Pat. No. 6,429,370 B1 discloses use of magnetic tape to form an EMI seal between a cabinet and a door and to adhere the door to the cabinet. The magnets are hard, that is, not compressible, physically. Therefore, a “gasket” consisting of a magnetic strip does not always provide a good seal between the door or panel and the cabinet, and may allow electromagnetic emissions to leak out if the panel or door warps.
- This invention is directed to solving these and other problems and disadvantages of the prior art. Generally according to the invention, a pliable (e.g., compressible) gasket provides both the mechanical function of keeping a door or a panel mounted on (e.g., closed and tightly sealed against) a cabinet and the electromagnetic function of shielding against EMI emissions even if the door or panel becomes warped.
- Specifically according to the invention, a gasket for preventing emissions of electromagnetic radiation from a cabinet having an opening and a panel for mounting over the opening comprises a first and a second half of the gasket, with the first half of the gasket comprising a first half of a self-engaging disengageable and reengageable fastener, such as a hook-and-loop fastener, for surrounding the opening, and with the second half of the gasket comprising a second half of the fastener for engaging the first half of the fastener when the panel is mounted over the opening, and a material that blocks electromagnetic radiation carried by a pliable substrate for surrounding the opening and conforming to the shape of the space between the periphery and the panel when the panel is mounted over the opening.
- This structure not only effectively seals the cabinet against emission of electromagnetic radiation from the cabinet, but also mounts the panel on the cabinet to keep the opening into the cabinet closed and tightly sealed, yet allows for easy removal and subsequent remounting of the panel.
- These and other features and advantages of the invention will become more apparent from the following descriptions of illustrative embodiments of the invention considered together with the drawing, wherein:
- FIG. 1 is a perspective view of an electronic-equipment cabinet that includes an illustrative embodiment of the invention;
- FIG. 2 is a perspective-view diagram of a first illustrative embodiment of a gasket of the cabinet of FIG. 1;
- FIG. 3 is a cross-section diagram of a first half of the gasket of FIG. 2.
- FIG. 4 is a perspective-view diagram of a second illustrative embodiment of the gasket of the cabinet of FIG. 1;
- FIG. 5 is a cross-section diagram of a first half of the gasket of FIG. 4;
- FIG. 6 is a perspective-view diagram of a third illustrative embodiment of the gasket of the cabinet of FIG. 1;
- FIG. 7 is a perspective-view diagram of a fourth illustrative embodiment of the gasket of the cabinet of FIG. 1; and
- FIG. 8 is a cross-section diagram of a first half of the gasket of FIG. 7.
- FIG. 1 shows a
cabinet 100 for holdingelectronic equipment 104. One side ofcabinet 100 defines anopening 101 intocabinet 100.Opening 101 is normally closed by an access panel (e.g., a door) 102 that is openably, and preferably removably, mounted oncabinet 100 over opening 101. The outer periphery of opening 101 carries afirst half 112 of anEMI shielding gasket 110, while the outer periphery ofpanel 102 carries asecond half 114 ofgasket 110. - According to the invention,
gasket 110 provides both the electromagnetic function of shielding against EMI emissions fromequipment 104 out ofcabinet 100 and the mechanical function of keepingpanel 102 mounted on, closed, and tightly sealed against, the rest ofcabinet 100. Gasket 110 uses a combination of a self-engaging disengageable and reengageable fastener, such as a Velcro® hook-and-loop fastener, and a pliable (e.g., compressible) EMI shielding material to provide these functions. - FIGS. 2 and 3 show a first illustrative embodiment of
gasket 110. As shown in FIG. 2,second half 114 ofgasket 110 is merely a strip of one of the hook and the loop material of the hook-and-loop fastener.First half 112 ofgasket 110 is shown in cross-section in FIG. 3. It comprises amaterial 302 that blocks EMI radiation, such as a conductive foil or a conductive woven material, and apliable material 300, such as foam, that carriesmaterial 302. As shown in FIG. 3,material 302 illustratively encapsulatespliable foam material 300 which has an “I”-shaped cross-section. One channel of the “I”-shape is occupied by the other 304 of the hook and the loop material of the hook-and-loop fastener, and the other channel of the “I”-shape is occupied by an adhesive 306 that attachesfirst half 112 ofgasket 110 tocabinet 100. The width ofsecond half 114 ofgasket 110 is preferably no more than the width ofmaterial 304. Of course, the positions of the twohalves gasket 110 can be interchanged, withfirst half 112 being mounted onpanel 102 andsecond half 114 being mounted oncabinet 100. - During use, when
panel 102 is mounted oncabinet 100, the two halves of the hook-and-loop fastened adhere to, or engage, each other, and keeppanel 102 mounted on and pulled tightly againstcabinet 100. The adhesion between the two halves of the hook-and-loop fastener compressesfoam 300 betweenpanel 102 andcabinet 100 andfoam 300 andmaterial 302 conform to the shape of the space betweenpanel 102 andcabinet 100, thus forming a tight seal between them and compensating for any irregularities, such as those caused by buckling ofpanel 102.Material 302 aroundfoam 300 provides a double-layer of protection against electromagnetic radiation leakage out ofcabinet 100. The two halves of the hook-and-loop fastener are disengaged andpanel 102 is dismounted fromcabinet 100 merely by pullingpanel 102 off ofcabinet 100. - Use of a full strip of hook or loop material for
second half 114 ofgasket 110 may make removal ofpanel 102 fromcabinet 100 too difficult because of the strength of adhesion between the two halves ofgasket 110. To adjust, or lessen, this force of adhesion,first half 114 ofgasket 110 may be formed of periodically-spaced strips, instead of an uninterrupted strip, of the hook or loop material. Alternatively, the density of the hooks in the hook material may be reduced, thereby lessening the force of adhesion between the two halves ofgasket 110. Also, the two halves ofgasket 110 need not be attached tocabinet 100 andpanel 102 by adhesive, but rather may be attached by any desired means, e.g., rivets, screws, through-hole pop plugs, etc. - A second illustrative embodiment of
gasket 110 is shown in FIGS. 4 and 5. In this embodiment,first half 112 ofgasket 110, shown in cross-section in FIG. 5, is made of patches orstrips 502 of the conductive shielding material woven into or adhered onto the hook orloop material 504/504′ through periodically-spacedslots 500. In this embodiment,portion 504′ ofmaterial 504/504′ provides the function offoam 300 of the embodiment of FIG. 3.Second half 114 ofgasket 110 is made ofstrips 400 of the complementary hook or loop material, withgaps 402 in-betweenstrips 400 being sized and shaped to accommodatestrips 502 whenpanel 102 is mounted oncabinet 100. So long as the spacing betweenstrips 502 of the conductive material is less than one-half the wavelength of the highest frequency of radiation that the EMI-shielding gasket 110 is to block,strips 502 of conductive material suffice. However, it is easily envisioned that, instead of using strips ofmaterial 502, a singlecontinuous strip 604 of the conductive material may be used and would be woven into or adhered ontomaterial 504/504′ through a single, long,continuous slot 600, as shown in FIG. 6. In such an implementation, only theouter portion 504 ofmaterial 504/504′ would provide the gripping action to adherefirst half 112 ofgasket 110 tosecond half 114. In this implementation,second half 114 ofgasket 110 is formed of two side-by-side strips 606 of the complementary hook or loop material with aspace 608 in-between them to accommodatestrip 604, also as shown in FIG. 6. - As in the case of the embodiment of FIGS. 2 and 3, illustratively a layer of
adhesive 506 attachesfirst half 112 ofgasket 110 topanel 102 orcabinet 100 in the embodiments of FIGS. 4-6. - A fourth illustrative embodiment of
gasket 110 is shown in FIGS. 7 and 8. In this embodiment,second half 114 ofgasket 110 remains unchanged from FIG. 2. But infirst half 112 ofgasket 110, shown in cross-section in FIG. 8,shielding material 802 completely encapsulates hook orloop material 804 except for periodically-spacedcutouts 808.Cutouts 808 allow hook orloop material 804 offirst half 112 ofgasket 110 to protrude and engage the loop or hook material ofsecond half 114, andsecond half 114 is preferably no wider than the width ofcutouts 808. Alternatively, in the embodiment of FIGS. 7-8,second half 114 ofgasket 110 may be constructed identically tofirst half 112 but using the other of the hook or loop material from the one used in the construction offirst half 112. - As in the case of the embodiments of FIGS.2-6, a layer of
adhesive 806 attachesfirst half 112 ofgasket 110 topanel 102 ofcabinet 100 in the embodiments of FIGS. 7-8. - Of course, various changes and modifications to the illustrative embodiments described above will be apparent to those skilled in the art. For example, the pliable material may be made magnetic by embedding pieces or a strip of magnet therein, and if the cabinet is magnetic (e.g., steel), the hook-and-loop fastener may be dispensed with because the magnet and the cabinet will together act as a self-engaging disengageable and reengageable fastener. Such changes and modifications can be made without departing from the spirit and the scope of the invention and without diminishing its attendant advantages. It is therefore intended that such changes and modifications be covered by the following claims.
Claims (20)
Priority Applications (1)
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US10/272,240 US6720494B1 (en) | 2002-10-15 | 2002-10-15 | Cabinet gasket providing panel adhesion and electromagnetic interference shielding |
Applications Claiming Priority (1)
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US10/272,240 US6720494B1 (en) | 2002-10-15 | 2002-10-15 | Cabinet gasket providing panel adhesion and electromagnetic interference shielding |
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US6720494B1 US6720494B1 (en) | 2004-04-13 |
US20040069515A1 true US20040069515A1 (en) | 2004-04-15 |
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US10/272,240 Expired - Fee Related US6720494B1 (en) | 2002-10-15 | 2002-10-15 | Cabinet gasket providing panel adhesion and electromagnetic interference shielding |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060151962A1 (en) * | 2004-12-15 | 2006-07-13 | Jemic Shielding Technology | Electrically conductive gasket with paint masking |
US7215536B2 (en) * | 2002-12-23 | 2007-05-08 | Hewlett-Packard Development Company, L.P. | Electromagnetic shield assembly |
WO2007079808A2 (en) * | 2005-12-21 | 2007-07-19 | Rohde & Schwarz Gmbh & Co. Kg | Housing for screening from electromagnetic interferences |
TWI822537B (en) * | 2022-12-28 | 2023-11-11 | 神雲科技股份有限公司 | Front bezel |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6943288B1 (en) * | 2004-06-04 | 2005-09-13 | Schlegel Systems, Inc. | EMI foil laminate gasket |
US7064280B1 (en) * | 2005-09-20 | 2006-06-20 | Rodgers Jimmie A | Radiation shielding panel construction system and panels therefore |
US9727611B2 (en) * | 2013-11-08 | 2017-08-08 | Samsung Electronics Co., Ltd. | Hybrid buffer management scheme for immutable pages |
US9980417B1 (en) * | 2017-01-10 | 2018-05-22 | Cisco Technology, Inc. | Magnetic electromagnetic interference gasket |
US10058014B1 (en) * | 2017-12-13 | 2018-08-21 | International Business Machines Corporation | Conductive adhesive layer for gasket assembly |
US10736246B2 (en) * | 2018-09-28 | 2020-08-04 | Apple Inc. | Electromagnetic interference shielding having a magnetically attracted shield arm |
US10777916B2 (en) * | 2019-02-19 | 2020-09-15 | Pratt & Whitnet Canada Llp | Gasket |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3889043A (en) * | 1972-06-09 | 1975-06-10 | Ducros Emile Paul J J | Earthing joint for shielding chambers electrically and electromagnetically |
US3969572A (en) * | 1975-03-05 | 1976-07-13 | Ncr Corporation | Electromagnetic interference shielding gasket for light-weight equipment enclosures |
US4791236A (en) * | 1987-07-10 | 1988-12-13 | The Zippertubing Co. | Releasable flexible conductive jacket |
US4820885A (en) * | 1987-09-25 | 1989-04-11 | Tom E Lindsay | Magnetic gasket for shielding against electromagnetic radiation |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6429370B1 (en) | 2000-08-31 | 2002-08-06 | Avaya Technology Corp. | Self-adhering electromagnetic interference door seal |
-
2002
- 2002-10-15 US US10/272,240 patent/US6720494B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3889043A (en) * | 1972-06-09 | 1975-06-10 | Ducros Emile Paul J J | Earthing joint for shielding chambers electrically and electromagnetically |
US3969572A (en) * | 1975-03-05 | 1976-07-13 | Ncr Corporation | Electromagnetic interference shielding gasket for light-weight equipment enclosures |
US4791236A (en) * | 1987-07-10 | 1988-12-13 | The Zippertubing Co. | Releasable flexible conductive jacket |
US4820885A (en) * | 1987-09-25 | 1989-04-11 | Tom E Lindsay | Magnetic gasket for shielding against electromagnetic radiation |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7215536B2 (en) * | 2002-12-23 | 2007-05-08 | Hewlett-Packard Development Company, L.P. | Electromagnetic shield assembly |
US20060151962A1 (en) * | 2004-12-15 | 2006-07-13 | Jemic Shielding Technology | Electrically conductive gasket with paint masking |
US7732714B2 (en) * | 2004-12-15 | 2010-06-08 | Jemic Shielding Technology | Electrically conductive gasket with paint masking |
WO2007079808A2 (en) * | 2005-12-21 | 2007-07-19 | Rohde & Schwarz Gmbh & Co. Kg | Housing for screening from electromagnetic interferences |
WO2007079808A3 (en) * | 2005-12-21 | 2007-11-29 | Rohde & Schwarz | Housing for screening from electromagnetic interferences |
US20080245561A1 (en) * | 2005-12-21 | 2008-10-09 | Rohde & Schwarz Gmbh & Co. Kg | Housing for Shielding from Electromagnetic Interference |
US7709749B2 (en) | 2005-12-21 | 2010-05-04 | Rohde & Schwarz Gmbh & Co. Kg | Housing for shielding from electromagnetic interference |
TWI822537B (en) * | 2022-12-28 | 2023-11-11 | 神雲科技股份有限公司 | Front bezel |
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