WO1998053655A1 - Boitier blinde - Google Patents

Boitier blinde Download PDF

Info

Publication number
WO1998053655A1
WO1998053655A1 PCT/JP1998/002132 JP9802132W WO9853655A1 WO 1998053655 A1 WO1998053655 A1 WO 1998053655A1 JP 9802132 W JP9802132 W JP 9802132W WO 9853655 A1 WO9853655 A1 WO 9853655A1
Authority
WO
WIPO (PCT)
Prior art keywords
case
gasket
cover
limiter
rib
Prior art date
Application number
PCT/JP1998/002132
Other languages
English (en)
Japanese (ja)
Inventor
Akihiko Fukai
Original Assignee
Advantest Corporation
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 Advantest Corporation filed Critical Advantest Corporation
Priority to DE19880835T priority Critical patent/DE19880835B4/de
Publication of WO1998053655A1 publication Critical patent/WO1998053655A1/fr

Links

Classifications

    • 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
    • H05K9/0049—Casings being metallic containers

Definitions

  • the present invention relates to a shield case that blocks electromagnetic noise.
  • the conventional shield case is composed of a case 20, a gasket 24, and a cover 21, and is fastened with a fastening means 30 and a washer 31 so that the electronic parts 4
  • the printed wiring board 40 on which 1 is mounted is shielded.
  • electromagnetic wave noise is radiated from the circuit of the printed wiring board to the outside. Further, the circuit block of the same printed wiring board 40 is mutually affected by the electromagnetic noise.
  • each circuit block of the printed wiring board 40 is separated for each cavity 25 to be shielded.
  • the case 20 and the cover 21 are made of an aluminum block by end milling or die milling because of the shielding property of electromagnetic wave noise and the good workability. It is formed by casting.
  • case 20 is subjected to tapping for the screw of the fastening means 30.
  • a conductive gasket 24 is inserted to improve the adhesion between the case 20 and the joint surface between the cover 21 and the shield effect.
  • a gasket is made by cutting a 0.5 mm thick sheet of conductive TFTE (Polytetrafluoroethylene).
  • the gasket 24 is sandwiched between the case 20 and the cover 21, and the fastening is performed by the fastening means 30 and the washer 31.
  • the present invention has been made in view of these problems, and its purpose is to ,
  • the number of man-hours to be tightened can be reduced to reduce the number of assembly steps.Furthermore, the distance between the case 20 and the cover 21 can be kept constant to stabilize the tightening and strengthen the shield. Is to provide. Disclosure of the invention
  • the first aspect of the present invention made to achieve the above object is as follows.
  • the gist of the present invention is a shield case characterized by having. Further, a second aspect of the present invention made to achieve the above object is as follows.
  • the gist is the shield case according to the first aspect of the present invention, in which the limiter is a washer.
  • a third aspect of the present invention which has been made to achieve the above object, is a gist of the shield case according to the first or second aspect of the present invention, in which a rib has an uneven pattern.
  • the fourth aspect of the present invention is that the height (b) of the limiter 22 is 80% to 90% of the thickness (c) of the gasket 24. And the height (a) of the rib 23 is about 60% of the thickness (c) of the gasket 24, and the gist is a shielded case described in claim 1.
  • FIG. 1 is a sectional view taken along line AA of FIG. 5 of a shield case of the present invention.
  • FIG. 2 is a sectional view of a main part of the shield case of the present invention.
  • FIG. 3 is an external view of a shape pattern of a rib and a limiter of the present invention.
  • FIG. 4 is another example of the external view of the rib and limit pattern of the present invention.
  • FIG. 5 is a top view of the shield case of the present invention.
  • FIG. 6 is a cross-sectional view taken along line BB of FIG. 7 of the conventional shield case.
  • FIG. 7 is a top view of a conventional shield case. BEST MODE FOR CARRYING OUT THE INVENTION
  • the shield case of the present invention is obtained by adding a rib 23 and a limiter 22 to the conventional configuration of the case 20, the gasket 24, and the cover 21. Make up.
  • the printed circuit board 40 on which the electronic component 41 is mounted is shielded by fastening with the fastening means 30 and the washer 31.
  • the limiter 22 has a tightening portion that restricts the compression of the gasket 24 when the case 20 and the cover 21 are fastened with the fastening means 30 and the washer 31. Installed around.
  • the ribs 23 are provided so that the gasket 24 has a small pressure and a constant pressure can be obtained by the limiter 22.
  • the height of the rib is a
  • the height of the limiter is b
  • the thickness of the gasket is c.
  • the height b of the limiter is determined by the thickness c of the gasket as shown in equation (1). 80-90%.
  • Limiter height b cx (0.8 to 0.9)- ⁇ ' ⁇ ⁇ (1)
  • the height a of the rib is, as shown in equation (2), 60 times the thickness of the gasket c. %.
  • the effect of the shield can be enhanced by forming the ribs into a pattern having an uneven shape so that the electromagnetic waves do not resonate at a specific frequency.
  • the gasket is a die-cut 0.5mm thick sheet of conductive TFTE (Polytetrafluoroethylene), which is the same as before. Then, the gasket 24 is sandwiched between the case 20 and the cover 21, and the case 20 is fastened with the fastening means 30 and the washer 31.
  • conductive TFTE Polytetrafluoroethylene
  • the entire joint surface of the gasket 24 is tightened by 10 to 20%, and only the rib 23 is further tightened by 60% .Therefore, the number of places to be tightened by the tightening means 30 should be reduced. Can be.
  • the distance between the case 20 and the cover 21 can be kept constant by the limiter 22.
  • the ribs for compressing the gasket have been described as being provided continuously.
  • the ribs may be provided discontinuously, in a mesh shape, or provided with desired concave portions instead of convex portions.
  • the cross-sectional shape of the rib may be trapezoidal,
  • the present invention can be similarly applied to a semicircle or any other shape.
  • limiter and the rib are illustrated on the example of being provided on the housing side, the limiter and the rib may be provided on the case side.
  • a limiter may be provided on the lid side and a rib may be provided on the case side, or vice versa.
  • the limiter may not be formed integrally with the case, but may be a limiter using a washer or the like.
  • the present invention is embodied in the form as described above, and has the following effects.
  • the ribs are tightened at a constant pressure without releasing the pressure over the entire area of the gasket as in the related art, the number of fastening portions of the fastening means can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

L'invention concerne un boîtier blindé avec lequel le nombre de parties à serrer est réduit, la force de serrage est homogène et le blindage est amélioré par maintien d'une certaine distance entre le corps de boîtier et le couvercle. De façon spécifique, l'invention concerne un boîtier blindé dont le corps et le couvercle sont assemblés à l'aide de moyens de serrage, des joints (24) étant maintenus entre ledit corps de boîtier et ledit couvercle. Des limiteurs (22) servent à limiter la distance entre le corps de boîtier et le couvercle après le serrage, et des nervures (23) compriment les joints.
PCT/JP1998/002132 1997-05-21 1998-05-14 Boitier blinde WO1998053655A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19880835T DE19880835B4 (de) 1997-05-21 1998-05-14 Abschirmgehäuse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP13080197A JP3304282B2 (ja) 1997-05-21 1997-05-21 シールドケース
JP9/130801 1997-05-21

Publications (1)

Publication Number Publication Date
WO1998053655A1 true WO1998053655A1 (fr) 1998-11-26

Family

ID=15043035

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1998/002132 WO1998053655A1 (fr) 1997-05-21 1998-05-14 Boitier blinde

Country Status (4)

Country Link
JP (1) JP3304282B2 (fr)
DE (1) DE19880835B4 (fr)
TW (1) TW465911U (fr)
WO (1) WO1998053655A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011013509A1 (fr) * 2009-07-31 2011-02-03 ボッシュ株式会社 Dispositif électronique
JP2015015385A (ja) * 2013-07-05 2015-01-22 株式会社デンソー 電子装置
DE102020109899A1 (de) * 2020-04-08 2021-10-14 Elringklinger Ag Gehäusedeckel und Verfahren zum Herstellen eines Gehäusedeckels

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62172198U (fr) * 1986-03-31 1987-10-31
JPH029500U (fr) * 1988-07-04 1990-01-22
JPH0369294U (fr) * 1989-11-09 1991-07-09
JPH04259286A (ja) * 1991-02-14 1992-09-14 Fujitsu Ltd 屋外筐体

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69019826T2 (de) * 1989-07-17 1996-03-14 Gore & Ass Dichtung aus metallisiertem mikroporösem polytetrafluorethylen zur elektromagnetischen abschirmung.
DE4405408C1 (de) * 1994-02-21 1995-05-04 Rolec Gehaeusesysteme Rose & R Metallgehäuse für den Einbau elektronischer Bauteile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62172198U (fr) * 1986-03-31 1987-10-31
JPH029500U (fr) * 1988-07-04 1990-01-22
JPH0369294U (fr) * 1989-11-09 1991-07-09
JPH04259286A (ja) * 1991-02-14 1992-09-14 Fujitsu Ltd 屋外筐体

Also Published As

Publication number Publication date
JPH10322075A (ja) 1998-12-04
DE19880835B4 (de) 2005-11-03
JP3304282B2 (ja) 2002-07-22
TW465911U (en) 2001-11-21
DE19880835T5 (de) 2004-12-09

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