GB2181607A - Shielding electronic devices - Google Patents

Shielding electronic devices Download PDF

Info

Publication number
GB2181607A
GB2181607A GB08623700A GB8623700A GB2181607A GB 2181607 A GB2181607 A GB 2181607A GB 08623700 A GB08623700 A GB 08623700A GB 8623700 A GB8623700 A GB 8623700A GB 2181607 A GB2181607 A GB 2181607A
Authority
GB
United Kingdom
Prior art keywords
casing
electrically conductive
shielding
bush
electrically connected
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.)
Granted
Application number
GB08623700A
Other versions
GB8623700D0 (en
GB2181607B (en
Inventor
Hiroaki Sasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Publication of GB8623700D0 publication Critical patent/GB8623700D0/en
Publication of GB2181607A publication Critical patent/GB2181607A/en
Application granted granted Critical
Publication of GB2181607B publication Critical patent/GB2181607B/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007Casings
    • H05K9/0018Casings with provisions to reduce aperture leakages in walls, e.g. terminals, connectors, cables
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6598Shield material
    • H01R13/6599Dielectric material made conductive, e.g. plastic material coated with metal

Abstract

A resilient conductive bush (16) mechanically and electrically connects the shield (2) of a cable (1) to a conductive casing (7) so as to shield electronic elements (5) inside the casing. The casing may house and support a bar-code scanner or mouse, and may be formed of plastics material coated with metal or electrically conductive paint. <IMAGE>

Description

SPECIFICATION Electronic devices The present invention relates to electronic devices such as a barcode scanner, or mouseforexample.
It is an object of the present invention to provide an improved electronic device.
According to the present invention there is provided, an electronic device wherein one end of a shielded wire having an electrically conductive wire coated with a shielding material and an armoring tube is fitted to a main body casing housing an electronic element, andthe electrically conductivewire is electrically connected to the electronic element, while a portion oftheshielding material exposed by partially removing the armoring tube is electrically connected to a shielding portion provided on the casing, the improvementwhich comprises: a bush made of an electrically conductive resilient material through which the shielded wire is secured to the casing, the shielding material being electrically connected to the bush at a portion thereof within the bush which is exposed by partially removing the armoring tube, and a portion of the bush being electrically connected to the shielding portion ofthecasing.
Electronic devices embodying the present invention, will now be described, by way of example, with reference to the accompanying diagrammatic drawings in which: Figure 1 is a fragmentary sectional view of a portion of a bar code scanner; Figure 2 is a fragmentary exploded perspective view ofthe scanner of Figure 1; Figures 3(a) and 3(b) are exploded perspective views ofthe bar code scanner embodying the present invention; and Figure 4 is a fragmentary sectional view of a portion of a previously proposed bar scanner.
A previously proposed bar scanner incorporating an electromagnetic shielding mechanism is shown in Figure 4. As shown a shielded wire 4 is composed of electrically conductive wires 1, a shielding material 2 which shields electromagnetic waves, and an armoring tube 3 which covers the wires 1 and the shielding material 2. One end ofthe shielded wire 4 is connected to the main body of an apparatus (not shown), and the other end of the wire 4 is attached through a rubber bush 8 made of an electrically insulating material such as vinyl chloride or urethane rubberto a main body casing 7 which houses a printed circuit board 6 having various electronic elements 5 mounted thereon. The wires 1 are electrically connected to the respective electronic elements 5 through the printed board 6.A portion of the shielding material 2 inside the casing 7 is exposed by partially removing the armoring tube 3. The exposed por tion of the shielding material2issubjectedtoanapp- ropriate terminal processing to form a thin wire 2a at the end thereof. This thin wire 2a is electrically connected to a screw 10 provided in a projection 9 pro jecting insidethecasing7and isgroundedthrough the screw 10.
The above-described conventional device suffers, however, from the following disadvantages. App ropriateterminal processing of the shielding mat erial 2 is needed and it is necessary to provide the projection 9 orthe screw 10 on the casing 7 in order to ground the shielding material 2, which leads to a complicated structure. In addition, the device re quires a space for providing the projection 9 on the casing 7 and for electrically connecting the thin wire 2a of the shielding material 2 and the screw 10. In other words, the dimension A between the end 7b of the casing 7 and the end of the printed board 6 and the dimension B, that is, the width of the casing 7, must be relatively large, and this inhibits any reduction in the size of the device.
In Figures 1 to 3(b) partssimilartothosein Figure4 are similarly referenced.
Thebarscannershown inFigures3aand3binclu- des a main body casing 7 constituted by a split casing which consists of a pair of upper and lower casing members. The casing 7 houses therein a group of various electronic elements 5 mounted on a printed board 6. Further housed in the casing 7 are a sensor unit 11 electrically connected to the printed board 6, a shielded wire 4, and a pivotally attached portion 13 of an operating member 13 for operating a switching element 12 provided on the printed board 6.Afterthe above-described elements have been housed in the casing 7,the pair of split casing members are joined together, and the respective ends 7a and 7b of the casing members are rigidly connected by means of retainertubes 14a and 14b, respectively. Thefinger- rest portion 13a of the operating member 13 projects from an opening 15 bored in the upper side wall of the casing 7, thereby allowing an operator to perform a switching operation. One end portion of the shielded wire 4 is fitted to the end 7b of the casing 7 through a rubber bush 16, and the other end ofthe shielded wire is connected to a connector portion of the main body of an apparatus.
The details of the sensor unit 11 are shown in Figure 3(b). As shown in this Figure, the casing ofthe sensor unit 11 is also a split casing 17 which consists of a pair of upper and lower casing members. A groove 19 is formed in the inner surface of the casing 17 for receiving an optical fibre 18. A lens receiving portion 21 is formed in the casing 17 for receiving a ball lens 20 atone end ofthe optical fibre 18. Two grooves 22a and 22b are formed in the casing 17 at the other end of the optical fibre 18 for accommodating two branches of the fibre 18 providing two optical transmission sections 18a and 18b.Further, an accommodating portion 23 is formed at the termination of the groove 22a for accommodating a phototransistor (not shown), and an accommodating portion 24 is formed atthetermination ofthe groove 22b for ac commodating a light-emitting element such as an LED (not shown). After the above-described mem- bers have been mounted, the casing members 17 are joined together in one unit and a cover 25 covers the sensore unit 11.
This bar scanner differs from previously proposed scanners in the mechanism for grounding the shiel dedwire4.Thegrounding mechanism is shown in detail in Figures 1 and 2.
More specifically, the main body casing 7 is a synthetic resin moulded element, and an appropriate portion of its inner surface is plated with a metal or coated with an electrically conductive painttoform a shielding portion 26. The casing 7 is provided atthe end 7b with the shielded wire 4 inserted into the rubber bush 16 made of an electrically conductive rubber. A non-circular groove 16a is formed in the outer surface of the portion 27 at the end 7b is fitted into the groove 16a. The shielded wire 4 is composed of electrically conductive wires 1 which are coated with a shielding material 2 having an electromagnetic shielding effect for the wires 1, together with an armoring tube 3. The wires 1 are electrically connected to the electronic elements through the printed board 6.A portion ofthe shielding material 2 which is within the rubber bush 16 is exposed by partially removing the armoring tube 3 so that the shielding material 2 is electrically connected to the rubber bush 16. The rubber bush 16 is electrically connected at the groove 1 6a to the shielding portion 26 which extends to the inner surface of the bentportion 27 at the end 7b of the casing 7.
Accordingly, the shielding material 2 ofthe shiel ded wire 4 is grounded to the shielding portion 26 of the casing 7through the rubber bush 16 made of an electrically conductive rubber. Thus, it is possible to reliably shield any electromagnetic wave generated from the outside of the wires 1.
As the shielding portion 27 ofthe casing 7, it is also possible to employ known shielding means such as a shielding plate, or a shielding wire. As the bush, it is, as a matter of course, possible to employ an electrically conductive resilient member made of a synthetic resin material formed by mixing an electrically conductive substance into a synthetic resin material such as vinyl chloride.
As has been described above, the shielding material ofthe shielded wire is electrically connected to the shielding portion ofthe main body casing through a bush made of an electrically conductive resilient material. It is, therefore, possible to provide an electronic device which is simple in arrangement and easy to assemble as compared with the conventional device and which requires only an extremely small spaceforthe electrical connection so that the size of the device can be reduced. In addition, the device can reliably shield various kinds of electromagnetic wave.

Claims (6)

1. An electronic device comprising a shielded wire having an electrically conductive wire enveloped bya shielding material and an armoring sleeve, a portion of said shielding material being ex posed through a removed portion of said armoring sleeve, a main body casing having a shielding portion and housing an electronic element, the electrically conductive wire being electrically connected to said electronic element, and a bush made of an electrically conductive resilient material through which said shielded wire is anchored to said casing, said shielding material being electrically connected to said bush atthe exposed portion thereof within said bush, and a portion of said bush being electrically connected to said shielding portion of said casing.
2. An electronic device according to Claim 1, wherein said main body casing is a synthetic resin molded element, having a portion of its innersurface plated with a metal or coated with an electrically conductive paint to form said shielding portion.
3. An electronic device according to Claim 1 orto Claim 2, wherein said bush is made of an electrically conductive synthetic resin material formed by mixing an electrically conductive substance into a synthetic resin material such as vinyl chloride.
4. An electronic device substantially as hereinbefore described with reference to Figures 1 to 3(b) of the accompanying drawings.
5. A bar code scanner incorporating a device according to any preceeding claim.
6. A mouse incorporating a device according to any one of Claims 1 to 4.
GB8623700A 1985-10-04 1986-10-02 Shielded electronic devices Expired GB2181607B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1985151500U JPS6259973U (en) 1985-10-04 1985-10-04

Publications (3)

Publication Number Publication Date
GB8623700D0 GB8623700D0 (en) 1986-11-05
GB2181607A true GB2181607A (en) 1987-04-23
GB2181607B GB2181607B (en) 1989-11-22

Family

ID=15519865

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8623700A Expired GB2181607B (en) 1985-10-04 1986-10-02 Shielded electronic devices

Country Status (3)

Country Link
JP (1) JPS6259973U (en)
DE (1) DE3633793A1 (en)
GB (1) GB2181607B (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4137355A1 (en) * 1991-11-13 1993-05-19 Contact Gmbh ELECTRICAL CONNECTOR FOR SHIELDED CABLES
FR2701603A1 (en) * 1993-02-16 1994-08-19 Alcatel Telspace Electrical ground connection system between a coaxial base and a soleplate of a microwave circuit and electrical connection device used in such a system.
DE4413115A1 (en) * 1993-04-16 1994-10-20 Yazaki Corp Connector which can be joined together and detached from the side
FR2769757A1 (en) * 1997-10-15 1999-04-16 Pouyet Sa Screened cable wall connection system, for ISDN or telephone lines
NL1008522C2 (en) * 1998-03-06 1999-09-07 Beele Eng Bv Transit device.
FR2777709A1 (en) * 1998-04-17 1999-10-22 Smiths Industries Plc ELECTRICAL CONNECTOR FOR ESTABLISHING A CONNECTION WITH A CONDUCTIVE SLEEVE OF A CABLE
EP1083635A2 (en) * 1999-09-09 2001-03-14 Weidmüller Interface GmbH & Co. Distributor for connecting actuators and/or sensors
WO2001043233A1 (en) * 1999-12-06 2001-06-14 Koninklijke Philips Electronics N.V. Shielded housing and shielded electric cable
FR2824416A1 (en) * 2001-05-04 2002-11-08 Sick Ag Thermal sensor, to register extreme conditions, has a carrier card held within the hollow space of an injection molded housing, in a springboard-type mounting for protection against shocks and vibrations
FR2981210A1 (en) * 2011-10-10 2013-04-12 Leoni Wiring Systems France Connection device for connecting shielded cable on case in electrical circuit of e.g. electric car, has electrically conductive sleeve forming sealing bridge between sealing sheath of cable and electrically insulating sheath
JP2013110858A (en) * 2011-11-21 2013-06-06 Yazaki Corp Shell fixing structure
CN103270556A (en) * 2010-12-27 2013-08-28 矢崎总业株式会社 Wire harness shield structure
FR3023986A1 (en) * 2014-07-21 2016-01-22 Leoni Wiring Systems France IMPROVED DEVICE FOR CONNECTING AN ARMORED CABLE TO A HOUSING
EP3106840A1 (en) * 2015-06-16 2016-12-21 Baumer Electric Ag Electric sensor with shielding enclosure

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH684852A5 (en) * 1991-06-07 1995-01-13 Mettler Toledo Ag Temperature probe for potentiometric measuring chains and methods for its preparation.
DE4333800A1 (en) * 1993-10-04 1995-04-06 Deutsche Automobilgesellsch Device for detecting the angle of rotation
DE4441169A1 (en) * 1994-11-18 1996-02-01 Siemens Ag Input equipment for shifting cursor on screen e.g. for program control and monitoring of medical magnetic resonance appts.
DE19618631A1 (en) * 1996-05-09 1997-11-13 Teves Gmbh Alfred Inductive sensor measuring angular displacement or rotation from e.g. ferromagnetic sectored disc
DE29706898U1 (en) * 1997-04-16 1997-08-14 Buerkert Werke Gmbh & Co Device socket
JP2002158487A (en) * 2000-11-20 2002-05-31 Nok Corp Grommet
WO2005039591A1 (en) 2003-10-23 2005-05-06 F. Hoffmann-La Roche Ag Benzazepine derivatives as mao-b inhibitors
JP5802010B2 (en) * 2010-12-27 2015-10-28 矢崎総業株式会社 Wire harness shield structure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1469445A (en) * 1973-11-05 1977-04-06 Rheem International Immersion type heating element for a water storage tank
GB1470807A (en) * 1974-06-11 1977-04-21 Singer Co Electromagnetic interference protection apparatus
EP0016367A1 (en) * 1979-03-14 1980-10-01 System- &amp; Verfahrenstechnik Verwaltungsgesellschaft mbH. Process for the screening of high-frequency electric and electromagnetic waves at sealed feed-throughs for a bundle of lines through a wall and apparatus for carrying out this process
EP0058876A2 (en) * 1981-02-13 1982-09-01 System- und Verfahrenstechnik Verwaltungsgesellschaft mbH Apparatus for screening electric and electromagnetic waves at dense feed-throughs of line bundles through a wall
EP0090539A2 (en) * 1982-03-31 1983-10-05 AMP INCORPORATED (a New Jersey corporation) Shielded connector
GB2160718A (en) * 1984-06-20 1985-12-24 Marconi Co Ltd Elastomeric screen for coaxial cable

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668612A (en) * 1970-08-07 1972-06-06 Lindsay Specialty Prod Ltd Cable connector
US4614398A (en) * 1984-12-21 1986-09-30 Simmonds Precision Shielded cable terminal connection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1469445A (en) * 1973-11-05 1977-04-06 Rheem International Immersion type heating element for a water storage tank
GB1470807A (en) * 1974-06-11 1977-04-21 Singer Co Electromagnetic interference protection apparatus
EP0016367A1 (en) * 1979-03-14 1980-10-01 System- &amp; Verfahrenstechnik Verwaltungsgesellschaft mbH. Process for the screening of high-frequency electric and electromagnetic waves at sealed feed-throughs for a bundle of lines through a wall and apparatus for carrying out this process
EP0058876A2 (en) * 1981-02-13 1982-09-01 System- und Verfahrenstechnik Verwaltungsgesellschaft mbH Apparatus for screening electric and electromagnetic waves at dense feed-throughs of line bundles through a wall
EP0090539A2 (en) * 1982-03-31 1983-10-05 AMP INCORPORATED (a New Jersey corporation) Shielded connector
GB2160718A (en) * 1984-06-20 1985-12-24 Marconi Co Ltd Elastomeric screen for coaxial cable

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4137355A1 (en) * 1991-11-13 1993-05-19 Contact Gmbh ELECTRICAL CONNECTOR FOR SHIELDED CABLES
FR2701603A1 (en) * 1993-02-16 1994-08-19 Alcatel Telspace Electrical ground connection system between a coaxial base and a soleplate of a microwave circuit and electrical connection device used in such a system.
EP0612206A1 (en) * 1993-02-16 1994-08-24 Alcatel Telspace Electric ground connection system between a coaxial connector and a plate of a hyperfrequency circuit and electric connection device for such a system
US5550521A (en) * 1993-02-16 1996-08-27 Alcatel Telspace Electrical ground connection between a coaxial connector and a microwave circuit bottom plate
DE4413115A1 (en) * 1993-04-16 1994-10-20 Yazaki Corp Connector which can be joined together and detached from the side
FR2769757A1 (en) * 1997-10-15 1999-04-16 Pouyet Sa Screened cable wall connection system, for ISDN or telephone lines
EP0921603A1 (en) * 1997-10-15 1999-06-09 Pouyet S.A. Wall socket at least partially shielded and process of connecting an electrical cable
WO1999045620A1 (en) * 1998-03-06 1999-09-10 Beele Engineering B.V. A bushing
US6359224B1 (en) 1998-03-06 2002-03-19 Beele Engineering B.V. Bushing
NL1008522C2 (en) * 1998-03-06 1999-09-07 Beele Eng Bv Transit device.
US6568945B2 (en) 1998-04-17 2003-05-27 Smiths Industries Public Limited Company Electrical connection and connectors
FR2777709A1 (en) * 1998-04-17 1999-10-22 Smiths Industries Plc ELECTRICAL CONNECTOR FOR ESTABLISHING A CONNECTION WITH A CONDUCTIVE SLEEVE OF A CABLE
EP1083635A2 (en) * 1999-09-09 2001-03-14 Weidmüller Interface GmbH & Co. Distributor for connecting actuators and/or sensors
EP1083635A3 (en) * 1999-09-09 2003-03-19 Weidmüller Interface GmbH & Co. Distributor for connecting actuators and/or sensors
WO2001043233A1 (en) * 1999-12-06 2001-06-14 Koninklijke Philips Electronics N.V. Shielded housing and shielded electric cable
US6459040B2 (en) 1999-12-06 2002-10-01 Koninklijke Philips Electronics N.V. Housing and cable with electromagnetic interference shielding
FR2824416A1 (en) * 2001-05-04 2002-11-08 Sick Ag Thermal sensor, to register extreme conditions, has a carrier card held within the hollow space of an injection molded housing, in a springboard-type mounting for protection against shocks and vibrations
EP2660827A4 (en) * 2010-12-27 2014-05-28 Yazaki Corp Wire harness shield structure
US9035200B2 (en) 2010-12-27 2015-05-19 Yazaki Corporation Shielding structure for wire harness
CN103270556A (en) * 2010-12-27 2013-08-28 矢崎总业株式会社 Wire harness shield structure
EP2660827A1 (en) * 2010-12-27 2013-11-06 Yazaki Corporation Wire harness shield structure
EP2666673A2 (en) * 2010-12-27 2013-11-27 Yazaki Corporation Wire harness shield structure
CN103490356A (en) * 2010-12-27 2014-01-01 矢崎总业株式会社 Wire harness shield structure
CN103270556B (en) * 2010-12-27 2016-04-06 矢崎总业株式会社 For the shielding construction of wire harness
CN103490356B (en) * 2010-12-27 2016-03-09 矢崎总业株式会社 For the shielding construction of wire harness
EP2666673A3 (en) * 2010-12-27 2014-05-28 Yazaki Corporation Wire harness shield structure
US9040845B2 (en) 2010-12-27 2015-05-26 Yazaki Corporation Shielding structure for wire harness
FR2981210A1 (en) * 2011-10-10 2013-04-12 Leoni Wiring Systems France Connection device for connecting shielded cable on case in electrical circuit of e.g. electric car, has electrically conductive sleeve forming sealing bridge between sealing sheath of cable and electrically insulating sheath
JP2013110858A (en) * 2011-11-21 2013-06-06 Yazaki Corp Shell fixing structure
FR3023986A1 (en) * 2014-07-21 2016-01-22 Leoni Wiring Systems France IMPROVED DEVICE FOR CONNECTING AN ARMORED CABLE TO A HOUSING
EP3106840A1 (en) * 2015-06-16 2016-12-21 Baumer Electric Ag Electric sensor with shielding enclosure

Also Published As

Publication number Publication date
JPS6259973U (en) 1987-04-14
GB8623700D0 (en) 1986-11-05
DE3633793A1 (en) 1987-04-16
GB2181607B (en) 1989-11-22

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Legal Events

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PCNP Patent ceased through non-payment of renewal fee