GB2214000A - Circuit screening enclosure - Google Patents

Circuit screening enclosure Download PDF

Info

Publication number
GB2214000A
GB2214000A GB8729676A GB8729676A GB2214000A GB 2214000 A GB2214000 A GB 2214000A GB 8729676 A GB8729676 A GB 8729676A GB 8729676 A GB8729676 A GB 8729676A GB 2214000 A GB2214000 A GB 2214000A
Authority
GB
United Kingdom
Prior art keywords
pcb
area
wall portion
screening
defined
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
GB8729676A
Other versions
GB2214000B (en
GB8729676D0 (en
Inventor
Roy Ernest Puttick
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.)
STC PLC
Original Assignee
* STC PLC
STC PLC
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 * STC PLC, STC PLC filed Critical * STC PLC
Priority to GB8729676A priority Critical patent/GB2214000B/en
Publication of GB8729676D0 publication Critical patent/GB8729676D0/en
Publication of GB2214000A publication Critical patent/GB2214000A/en
Application granted granted Critical
Publication of GB2214000B publication Critical patent/GB2214000B/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

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
    • H05K9/002Casings with localised screening
    • H05K9/0022Casings with localised screening of components mounted on printed circuit boards [PCB]
    • H05K9/0024Shield cases mounted on a PCB, e.g. cans, caps, conformal shields
    • H05K9/0032Shield cases mounted on a PCB, e.g. cans, caps, conformal shields having multiple parts, e.g. frames mating with lids
    • H05K9/0033Shield cases mounted on a PCB, e.g. cans, caps, conformal shields having multiple parts, e.g. frames mating with lids disposed on both PCB faces

Abstract

A circuit screening arrangement for a printed circuit board (10) which is slotted (11) to define the area (12) to be screened. A metal screening can has a wall portion (15) with lugs (16) which fit the slots. Clearance gaps (17,18) allow printed circuit tracks (13) to cross the bridging portions (14) between the slots. The screening is completed by a lid portion (19) and a base portion (21). <IMAGE>

Description

CIRCUIT SCREENING ARRANGEMENT.

This invention relates to a circuit screening arrangement for electronic components, such as are used in high frequency and high speed digital signal applications.

It is frequently required that a group of electronic components or an electronic sub-assembly mounted on a printed circuit board be electromagnetically screened with respect to the rest of the circuitry on the printed circuit board. Whilst it is possible to contain all the required components in a metal can which is itself mounted on the board there is then the problem of making connections between the screened components and the conductive tracks on the printed circuit board. In addition it is often necessary to provide a separate small printed circuit board within the metal can.

According to the present invention there is provided a circuit screening for electronic circuit components comprising a printed circuit board (pcb) having a series of slots formed therein to define an area of the pcb, the pcb carrying at least one conductive track pattern with some tracks at least extending from the defined area via portions of the board between adjacent slots, and a screening can having a first wall portion shaped to enclose an area corresponding to the defined pcb area with parts of the wall portion formed with lugs adapted to pass through the slots in the pcb, a second lid portion shaped to correspond to the defined pcb area and adapted to close the volume bounded by the wall portion and one face of the pcb, and a third base portion shaped to correspond to the defined pcb area and adapted to co-operate with the wall portion lugs where the lugs protrude on the other face of the pcb to complete the screening arrangement.

Embodiments of the invention will now be described with reference to the accompanying drawing which is an exploded view of a circuit screening arrangement.

In the drawing a printed circuit board (pcb) 10 is provided with a series of slots 11 formed to define an area 12 of the pcb. The pcb carries on at least one face a plurality of conductive tracks 13 some of which extend from the defined area 12 via portions 14 of the board between adjacent slots 11 to the area of the board outside the defined area. A metal screening can has a first wall portion 15 shaped to conform to the shape of the defined area 12. The wall portion has lugs 16 which will pass through the corresponding slots 11 when the wall portion is plasced on the pcb. The gaps 17 between the lugs are provided with clearance cut-outs 18 so that the metal wall does not touch the conductive tracks extending from the defined area 12. A lid portion 19 is also shaped to conform to the defined area 12 and is provided with a lip 20 which engages the edge of the wall portion remote from the pcb. A second base portion 21 is likewised shaped to conform to the defined area and is provided with a lip 22 which engages the protruding lugs 16 on the other side of the pcb. Th lid and base portions are secured by pillars 23, which pass through holes 24 in the pcb, and screws 25 which engage the ends of the pillars through holes 26 in the lid and base portions.

The invention provides a simple, cheap screening arrangement which allows direct printed circuit access to the screened area without the need for interconnecting terminals and wiring required for a separate screened pcb.

Claims (2)

CLAIMS.
1. A circuit screening for electronic components comprising a printed circuit board (pcb) having a series of slots formed therein to define an area of the pcb, the pcb carrying at least one conductive track pattern with some tracks at least extending from the defined area via portions of the board between adjacent slots, and a screening can having a first wall portion shaped to enclose an area corresponding to the defined pcb area with parts of the wall portion formed with lugs adapted to pass through the slots in the pcb, a second lid portion shaped to correspond to the defined pcb area and adapted to close the volume bounded by the wall portion and one face of the pcb, and a third base portion shaped to correspond to the defined pcb area and adapted to co-operate with the wall portion lugs where the lugs protrude on the other face of the pcb to complete the screening arrangement.
2. A circuit screening arrangement substantially as described with reference to the accompanying drawing.
GB8729676A 1987-12-19 1987-12-19 Circuit screening arrangement Expired - Fee Related GB2214000B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8729676A GB2214000B (en) 1987-12-19 1987-12-19 Circuit screening arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8729676A GB2214000B (en) 1987-12-19 1987-12-19 Circuit screening arrangement

Publications (3)

Publication Number Publication Date
GB8729676D0 GB8729676D0 (en) 1988-02-03
GB2214000A true GB2214000A (en) 1989-08-23
GB2214000B GB2214000B (en) 1991-06-26

Family

ID=10628782

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8729676A Expired - Fee Related GB2214000B (en) 1987-12-19 1987-12-19 Circuit screening arrangement

Country Status (1)

Country Link
GB (1) GB2214000B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226187A (en) * 1988-11-04 1990-06-20 Motorola Inc Miniature electromagnetic shield with opposing cantilever spring fingers
FR2684261A1 (en) * 1991-11-25 1993-05-28 Funai Electric Co Protective device for printed circuit boards.
EP0594041A1 (en) * 1992-10-23 1994-04-27 Siemens Aktiengesellschaft Fastening of a shield to a PCB
US5323299A (en) * 1992-02-12 1994-06-21 Alcatel Network Systems, Inc. EMI internal shield apparatus and methods
US5335147A (en) * 1992-02-12 1994-08-02 Alcatel Network Systems, Inc. EMI shield apparatus and methods

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721746A (en) * 1971-10-01 1973-03-20 Motorola Inc Shielding techniques for r.f. circuitry
US4370515A (en) * 1979-12-26 1983-01-25 Rockwell International Corporation Electromagnetic interference
EP0098212A2 (en) * 1982-06-25 1984-01-11 SAT (Société Anonyme de Télécommunications),Société Anonyme Shielding structure for printed circuit boards
EP0135211A1 (en) * 1983-07-14 1985-03-27 Philips Patentverwaltung GmbH Housing for a wired circuit board

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721746A (en) * 1971-10-01 1973-03-20 Motorola Inc Shielding techniques for r.f. circuitry
US4370515A (en) * 1979-12-26 1983-01-25 Rockwell International Corporation Electromagnetic interference
EP0098212A2 (en) * 1982-06-25 1984-01-11 SAT (Société Anonyme de Télécommunications),Société Anonyme Shielding structure for printed circuit boards
EP0135211A1 (en) * 1983-07-14 1985-03-27 Philips Patentverwaltung GmbH Housing for a wired circuit board

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226187A (en) * 1988-11-04 1990-06-20 Motorola Inc Miniature electromagnetic shield with opposing cantilever spring fingers
GB2226187B (en) * 1988-11-04 1993-01-06 Motorola Inc Miniature shield with opposing cantilever spring fingers
FR2684261A1 (en) * 1991-11-25 1993-05-28 Funai Electric Co Protective device for printed circuit boards.
GB2261998A (en) * 1991-11-25 1993-06-02 Funai Electric Co Shield device for printed circuit boards
GB2261998B (en) * 1991-11-25 1995-08-02 Funai Electric Co Shield device for printed circuit boards
US5323299A (en) * 1992-02-12 1994-06-21 Alcatel Network Systems, Inc. EMI internal shield apparatus and methods
US5335147A (en) * 1992-02-12 1994-08-02 Alcatel Network Systems, Inc. EMI shield apparatus and methods
EP0594041A1 (en) * 1992-10-23 1994-04-27 Siemens Aktiengesellschaft Fastening of a shield to a PCB

Also Published As

Publication number Publication date
GB2214000B (en) 1991-06-26
GB8729676D0 (en) 1988-02-03

Similar Documents

Publication Publication Date Title
US4717990A (en) Double-shielded housing for RF circuitry
CA2062546C (en) Microwave transceiver using technique of multilayer printed circuits
US5383098A (en) Shield assembly
US6037846A (en) Surface mount EMI gasket filter
US4628412A (en) Case for shielding electronic devices
EP0379686A2 (en) Printed circuit board
US4697044A (en) Casing for electronic devices
US5271056A (en) Electromagnetic interference shielding construction in a radio telephone
AU543036B2 (en) Printed circuit board
GB2186218B (en) Mounting circuit elements on circuit boards.
US4829432A (en) Apparatus for shielding an electrical circuit from electromagnetic interference
DE3476730D1 (en) Mounting pin for fixing an electronic component onto a printed-circuit board, and support means utilizing such a pin
TW419176U (en) Annular circuit components coupled with printed circuit board through-hole
SE9701417L (en) The housing and a method of producing a shielding housing
JPS5335163A (en) Method of producing printed circuit board substrate having through hole from metallic material
SG43102A1 (en) Printed circuit board shielded electrical connector
MX9704889A (en) Tuner structure and cable modem tuner that uses the same.
JPS6122698A (en) Electronic circuit module
GB2181603B (en) An improved enclosure for housing circuit boards
AU524769B2 (en) Mounting chip type circuit elements on a printed circuit board
EP0598914A4 (en) Three-dimensional printed circuit board, electronic circuit package using this board, and method for manufacturing this board.
GB2109546B (en) Examining printed circuit board provided with miniaturized electronic parts
DE3279897D1 (en) Hybrid integrated circuit component and printed circuit board mounting said component
EP0411639A3 (en) Electronic circuit substrate
GB2231205B (en) Method of manufacturing circuit board for mounting electronic components

Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20011219