GROUND ISOLATION DIODE FOR CRT SPARK GAP AND VIDEO GROUNDING
Original Publication Date: 1987-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Referring to the drawing Figure, the spark gap grounding of a Cathode Ray Tube (CRT) circuitry 5 display presents several design problems that affect circuitry reliability and electromagnetic emissions. To minimize electromagnetic emission interference (EM) at high video bandwidths, it is desirable to ground the exterior CRT conductive coating 6 directly to the chassis 7. This is most effectively done by using a CRT bulb which has the conductive coating sprayed up to and over the mounting hardware, usually a bonded shell or a tension band. Unfortunately, although this may reduce EMI related emissions, it provides an undesirable return path through the video circuitry and the chassis for CRT random arcing.