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EMI/RFI shielding assembly for cathode ray tube monitors

  • US 4,710,591 A
  • Filed: 10/06/1986
  • Issued: 12/01/1987
  • Est. Priority Date: 10/06/1986
  • Status: Expired due to Fees
First Claim
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1. A shielding assembly for suppressing electromagnetic emissions from the face of a cathode ray tube mounted in a metallic chassis comprising:

  • a filter window positioned in proximity to the face of said cathode ray tube, said filter window being comprised of a pair of contigous glass plates having metallic mesh interposed therebetween, said pair of glass plates including an inner plate situated closest to said face of said cathode ray tube and an outer plate, the corresponding dimensions of said outer plate being smaller than those of said inner plate, whereby a ledge is formed around the periphery of said window, said metallic mesh protruding from said plates as a sleeve along said ledge,a resilient member disposed on said ledge and encircling said filter window, said sleeve being wrapped upon said resilient member,a metallic bezel, clamping means disposed on said bezel for retaining said filter window therein, said resilient member being positioned adjacent the inner surface of said bezel, said clamping means including a movable member having an arcuate section at one extremity thereof, an adjacent planar section having a slot-like aperture therein for accommodating a screw, and a section orthogonal to said planar section at the opposite extremity thereof, said last mentioned section having a tail-like medial projection,said bezel having a tapped hole for receiving said screw and an oversized locating hole to accommodate said projection, said locating hole having a depth greater than the length of said projection, whereby the portion of the orthogonal section adjacent said projection abuts the inner surface of said bezel as said screw is torqued, said arcuate section contacting the surface of said inner glass plate whereby a pressure is applied normal to the glass surface, thereby compressing said resilient member against said bezel and effecting a first electrical termination.

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