Conductive screen for video display unit

• US 4,686,576 A
• Filed: 03/17/1986
• Issued: 08/11/1987
• Est. Priority Date: 03/17/1986
• Status: Expired due to Fees

• Current Assignee: Northern Technologies Limited 85 Torbay Road Markham Ontario Canada L3R 1G7
• Original Assignee: Northern Technologies, Inc. (Emerson Electric Company)
• Inventors: Hobbins, Martin E., Dickie, Robert G.
• Primary Examiner(s): COLES, EDWARD L
• Application Number:
  US06/840,393
• Time in Patent Office: 512 Days
• Field of Search: 358/247, 358/252, 358/253, 358/254, 358/245, 313/476, 174/35 MS
• US Class Current: 348/819
• CPC Class Codes: H01J 2229/8633 Meshes and patterns
• 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

Abstract

A conductive screen for a video display unit. In particular, this invention discloses an electromagnetic interference ("EMI") shielding device for a video display unit and methods for making the same. This invention relates to an EMI shielding device which an electrically conductive screen is in electrically conductive contact with the face of a cathode ray tube also eliminating the build up of static electricity therefrom. The conductive screen and faceplate of the video display unit are held in contact with the cathode ray tube by the bezel of the cathode ray tube housing.

Claims

1. In a video display unit of the type including a cathode ray tube and a housing for said cathode ray tube having a bezel with an opening for viewing the face of said cathode ray tube, the improvement comprising:

a faceplate through which the face of said cathode ray tube can be viewed;

a conductive screen between said faceplate and the face of said cathode ray tube;

a groove around the periphery of said faceplate on the outside surface thereof, said groove containing at least a portion of said screen; and

a ridge on said bezel mating with the groove in said faceplate for holding said screen and for electrically connecting said screen to said bezel.

2. The improved video display unit recited in claim 1 further comprising:

a ledge on one side of said groove adjacent the periphery of the faceplate, the ridge on said bezel gripping said screen against one side of said ridge and the bottom of said groove in said faceplate.

3. The improved video display unit recited in claim 1 further comprising:

a second ledge on the other side of said groove, said screen being glued in said groove with said ledges retaining the glue in said groove.