Electromagnetic wave shield case and a method for manufacturing electromagnetic wave shield case
First Claim
1. An electromagnetic wave shield case comprising:
- a shield case body covering electronic parts on a circuit board, said shield case body comprising an upper surface and side surfaces that collectively form a single continuous body having a single lower opening delimited by said side surfaces; and
a flange formed integrally with said shield case body,wherein the entirety of said shield case body and said flange are made of nonmagnetic metallic glass having a fracture strength/elastic constant value of more than 0.012,wherein said flange is elastically deformed to be grounded to a grounding conduction portion on said circuit board to prevent a leakage of electromagnetic waves to outside of said electromagnetic wave shield case, wherein said flange is tapered at an angle less than 90°
prior to being elastically deformed, andwherein said shield case body and said flange provide a shield amount SE of at least −
60 dB.
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Accused Products
Abstract
An objective of the present invention is to form a hyper-elastic flange integrally within a shield case body around a periphery thereof while decreasing an occupied area for grounding. The shield case 2 according to the present invention is disposed to cover electronic parts 6 on a circuit board 1, and which has a flange 7 formed integrally therewith so as to contact with a metallic ground line 3 on the circuit board 1. The flange 7 is elastically deformed to be grounded, thus a leakage of electromagnetic waves to the outside of the shield case 2 is prevented. The flange 7 is made of metallic glass. By forming the flange 7 from metallic glass, a displacement due to viscous flowing on the atomic level, which is different from a plastic deformation, can be utilized, and thus a high precision flange can be formed without a spring-back.
48 Citations
15 Claims
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1. An electromagnetic wave shield case comprising:
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a shield case body covering electronic parts on a circuit board, said shield case body comprising an upper surface and side surfaces that collectively form a single continuous body having a single lower opening delimited by said side surfaces; and a flange formed integrally with said shield case body, wherein the entirety of said shield case body and said flange are made of nonmagnetic metallic glass having a fracture strength/elastic constant value of more than 0.012, wherein said flange is elastically deformed to be grounded to a grounding conduction portion on said circuit board to prevent a leakage of electromagnetic waves to outside of said electromagnetic wave shield case, wherein said flange is tapered at an angle less than 90°
prior to being elastically deformed, andwherein said shield case body and said flange provide a shield amount SE of at least −
60 dB. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification
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- Resources
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Current AssigneeAkihisa Inoue, NGK Insulators Limited
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Original AssigneeAkihisa Inoue, NGK Insulators Limited
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InventorsInoue, Akihisa, Zhang, Tao, Kimura, Hisamichi, Muramatsu, Naokuni
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Primary Examiner(s)Bui; Hung S
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Application NumberUS11/025,794Publication NumberTime in Patent Office1,798 DaysField of Search361/800, 361/816, 361/818, 361/810, 174/35.R, 174/51US Class Current361/818CPC Class CodesH01F 1/15358 Making agglomerates therefr...H05K 9/0026 integrally formed from meta...H05K 9/0069 Methods for measuring the s...
