Electromagnetically shielded viewing window

• US 4,247,737 A
• Filed: 03/29/1979
• Issued: 01/27/1981
• Est. Priority Date: 03/29/1979
• Status: Expired due to Term

• Current Assignee: Spectrum Control Incorporated (API Technologies Corporation)
• Original Assignee: Spectrum Control Incorporated (API Technologies Corporation)
• Inventors: Johnson, Arthur J., Bostrom, Herbert G.
• Primary Examiner(s): Albritton, C. L.
• Assistant Examiner(s): Tone, D. A.
• Application Number:
  US06/024,894
• Time in Patent Office: 670 Days
• Field of Search: 174/35 MS, 174/35 R, 219/10.55 D
• US Class Current: 174/389
• CPC Class Codes: H01J 29/868 Screens covering the input or output face of the vessel, e.g. transparent anti-static coatings, X-ray absorbing layers
• CPC Class Codes: H05K 9/00 Screening of apparatus or components against electric or magnetic fields devices for absorbing radiation from an antenna H01Q17/00

Abstract

An electromagnetically shielded viewing window for an enclosure including a wire mesh member formed of respective crossing wires bonded between a pair of transparent panels, wherein the wire cross points are joined by nickel/copper plating of the wire mesh without covering the mesh open areas. A dull coating of antiqued silver is applied to the plated wire mesh to reduce window glare. A wire gasket extends around the panel perimeter, and a wire mesh portion projects beyond one of the panels and overlies the wire gasket to reliably ground the wire mesh when mounted to the enclosure.

Claims

1. An electromagnetically shielded viewing window for an enclosure comprising:

a pair of spaced, substantially transparent panels;

a wire mesh coextensively extending intermediate said panels, said wire mesh formed of respective crossing conductive wires;

conductive means joining said respective crossing conductive wires at each crossing and defining an open area therebetween;

said conductive means including a conductive plating material on said wire mesh sufficient to conductively join said conductive wires only at each crossing;

a wire gasket extending around the perimeter of at least one side of said panels; and

a portion of said wire mesh projecting beyond one of said panels and being in overlying conductive engagement with said wire gasket for groundably mounting to said enclosure.

2. An electromagnetically shielded viewing window according to claim 1, wherein said conductive plating material comprises nickel and copper.

3. An electromagnetically shielded viewing window according to claim 1, wherein said wire mesh comprises a mesh of woven metallic wires having diameters between about 0.0005 to 0.010 inch with about 40 to 75% open area.

4. An electromagnetically shielded viewing window according to claim 3, wherein said wire mesh comprises a mesh of stainless steel woven wire having a diameter of about 0.0023 inch, with about 100 openings per inch and an open area of about 60%.

5. An electromagnetically shielded viewing window according to claim 1, wherein said wire mesh includes a dull coating to reduce optical reflection from said wire mesh.

6. An electromagnetically shielded viewing window according to claim 1, including an elastomeric gasket extending around the perimeter of one of said panels and intermediate said panel and said projecting portion of wire mesh.

7. An electromagnetically shielded viewing window according to claim 1, including an additional, substantially transparent panel adjacent said pair of panels,

a second wire mesh coextensively extending intermediate said additional panel and said pair of panels,

said second wire mesh formed of respective crossing conductive wires, including conductive means joining said respective crossing conductive wires at each crossing and defining an open area therebetween;

and

a portion of said second wire mesh projecting beyond said one panel and being in overlying conductive engagement with said wire gasket and said first mentioned portion of said wire mesh.