Electromagnetic wave shield

• US 7,339,120 B2
• Filed: 06/25/2004
• Issued: 03/04/2008
• Est. Priority Date: 06/26/2003
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yoshinaga, Hiroshi, Shimizu, Shoichi, Kaneko, Shinichirou, Notohara, Yasuhiro, Deguchi, Futoshi
• Primary Examiner(s): Ngo; Hung V.
• Application Number:
  US10/875,626
• Publication Number:
  US 20050029919A1
• Time in Patent Office: 1,348 Days
• Field of Search: 174/35.R, 174/35.MS, 174/35.GC, 174/357, 174/392, 361/816, 361/818
• US Class Current: 174/357
• CPC Class Codes: H05K 9/009 comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked

Abstract

It is an object of the invention to provide an electromagnetic wave shield for attenuating a electric far field while suppressing the attenuation of the vicinal magnetic flux of an electromagnetic wave discharged from a high frequency electromagnetic wave generator.

An electromagnetic wave shield according to the invention comprises a plurality of electric conductors, a ground contact for carrying out a connection to a ground, and a lead wire for connecting the electric conductors to the ground contact, the electric conductors being electrically connected to the ground contact through the lead wire, wherein the electric conductors are provided in such a manner that a path reaching the ground contact through the lead wire from an optional point of each of the electric conductors is uniquely determined.

Claims

1. An electromagnetic wave shield for covering an apparatus which generates a high frequency electromagnetic field including an electric field and a magnetic flux, the electromagnetic wave shield comprising:

a plurality of electric conductors covered with an insulating material;

a ground contact for carrying out a connection to a ground; and

a lead wire for connecting the electric conductors to the ground contact, each of the plurality of the electric conductors being electrically connected to the ground contact through the lead wire, wherein each of the plurality of the electric conductors crosses another one of the electrical conductors without being electrically connected thereto due to the insulating material.

2. The electromagnetic wave according to claim 1 wherein said plurality of conductors are formed like a grid.

3. An electromagnetic wave shield according to claim 1 wherein each of the plurality of electric conductors has a thickness of 0.05 mm to 5 mm and a first end and a second end and each of the plurality of the electric conductors is provided in such a manner that the first end is electrically connected to the ground contact and the second end is not electrically connected to any electric element.