Shielding device for color television screen

• US 4,974,935 A
• Filed: 06/29/1989
• Issued: 12/04/1990
• Est. Priority Date: 06/29/1989
• Status: Expired due to Fees

• Current Assignee: Chin-Fu Lee
• Original Assignee: Chin-Fu Lee
• Inventors: Lee, Chin-Fu
• Primary Examiner(s): Arnold, Bruce Y.
• Assistant Examiner(s): Gass, Rebecca D.
• Application Number:
  US07/373,130
• Time in Patent Office: 523 Days
• Field of Search: 350/276 R, 358/247
• US Class Current: 359/601
• CPC Class Codes: H04N 5/72 Modifying the appearance of television pictures by optical filters or diffusing screens

Abstract

A shielding device for use on a color television screen has an electrically conductive mesh formed by knitting of black, anti-reflection conductive filaments, the diameter of the filaments being between 20-100 micrometer and the individual mesh being between 45-230 micrometer, and has a frame supporting the conductive mesh, the angle created between the filaments direction and the frame being in the range of 10-45 degree, and the conductive mesh lays over surface of a color television screen in a very close contact.

Claims

1. A shielding device for a color television screen comprising:

an electrically conductive mesh, a rigid frame, and a ground wire;

said mesh is formed by knitting black anti-reflection conductive filaments to diameter ranges of 20-100 micrometers and mesh aperture widths from 45-230 micrometers;

and wherein said filaments are laid against said rigid frame so that directions of the filaments are at angles of 10-45 degrees to said frame.

2. The shielding device of claim 1, wherein said electrically conductive mesh is integral with the display screen of the cathode ray tube, as a result of putting said device inside a television case and behind its front frame to place the electrically conductive mesh in close attachement to said display screen.

3. The shielding device of claim 2 wherein a concave connection frame is installed inside said front frame ;

said concave connection frame being adapted in size to the rigid frame to receive a connection which is attached to said ground wire.