Electromagnetic wave shield case and a method for manufacturing electromagnetic wave shield case

• US 20050162842A1
• Filed: 12/29/2004
• Published: 07/28/2005
• Est. Priority Date: 01/08/2004
• Status: Active Grant

• Current Assignee: Akihisa Inoue, NGK Insulators Limited
• Original Assignee: Akihisa Inoue, NGK Insulators Limited
• Inventors: Inoue, Akihisa, Muramatsu, Naokuni, Zhang, Tao, Kimura, Hisamichi
• Granted Patent: US 7,626,832 B2
• Time in Patent Office: Days
• US Class Current: 361/818
• CPC Class Codes: H01F 1/15358 Making agglomerates therefrom, e.g. by pressing
• CPC Class Codes: H05K 9/0026 integrally formed from metal sheet
• CPC Class Codes: H05K 9/0069 Methods for measuring the shielding efficiency; Apparatus therefor; Isolation container for testing

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.

Claims

1. An electromagnetic wave shield case comprising:

a shield case body configured to cover electronic parts on a circuit board; and

a flange formed integrally with said shield case body, wherein

said shield case body and said flange are made of metallic material having a value of about 0.01 or more expressed by a fracture strength/elastic constant, and

said flange is elastically deformed to be grounded to an grounding conduction portion on said circuit board to prevent a leakage of electromagnetic waves to outside of said electromagnetic wave shield case.

2. The electromagnetic wave shield case according to claim 1, wherein said flange has a flare width of 1 mm or less.

3. The electromagnetic wave shield case according to claim 2, wherein said flange has at least one cut along a direction of said flare width.

4. The electromagnetic wave shield case according to claim 1, wherein said flange has a nonlinear external periphery portion.

5. An electromagnetic wave shield case comprising:

a shield case body configured to cover electronic parts on a circuit board; and

a flange formed integrally with said shield case body, wherein,

said shield case body and said flange are made of metallic glass, and

said flange is elastically deformed to be grounded to an grounding conduction portion on said circuit board to prevent a leakage of electromagnetic waves to outside of said electromagnetic wave shield case.

6. The electromagnetic wave shield case according to claim 5, wherein said flange has a flare width of 1 mm or less.

7. The electromagnetic wave shield case according to claim 6, wherein said flange has at least one cut along a direction of said flare width.

8. The electromagnetic wave shield case according to claim 5, wherein said flange has a nonlinear external periphery portion.

9. The electromagnetic wave shield case according to claim 5, wherein said metallic glass is a zirconium base alloy having amorphous structure.

10. A method for manufacturing an electromagnetic wave shield case according to claim 5, wherein

said electromagnetic wave shield case is made by pressure forming in a supercooled liquid temperature region of said metallic glass to be used for said electromagnetic wave shield case.

11. A method for manufacturing an electromagnetic wave shield case according to claim 5, wherein

said electromagnetic wave shield case is made by warm pressing in a temperature region defined in between a glass transition temperature and a crystallization temperature of said metallic glass to be used for said electromagnetic wave shield case.

12. The method for manufacturing an electromagnetic wave shield case according to claim 10, wherein said metallic glass is a zirconium base alloy having amorphous structure.

13. The method for manufacturing an electromagnetic wave shield case according to claim 11, wherein said metallic glass is a zirconium base alloy having amorphous structure.