Filter for CRT screen

Details Filter for CRT screen Filter for CRT screen

1987-07-16

1988-07-05

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313479, 313112, H01J 2989

Patent

active

047557168

ABSTRACT:
A filter for a CRT screen according to the invention is constituted such that a compound sheet consisting of a conductive net and a transparent resin film is molded so as to be closely attached to the CRT screen, and also to avoid the occurrence of moire fringes, the mesh of the net is selected at a suitable value such that the ratio of the pitch of the scanning lines of the CRT and the pitch of the wires of the net does not fall near simple integers or the inverse numbers thereof. The filter can shut off the electromagnetic waves, electrostatic charge, ultraviolet rays, etc. which are generated from the CRT, without spoiling the resolution of the CRT and can substantially prevent adverse influences on the human body by the CRT. No moire fringes are produced on the screen. A hard coating treatment and a glare-proofing treatment are further performed, so that an illumination lamps or the like in the room are not reflected from the filter surface. Therefore, the operators can continue their work without fatigue of the eyes and without adverse mental influence based on such fatigue. Further, when the surface of the CRT filter is cleaned or even if a point of pencil or the like accidentally touches the filter surface, no scratching is caused on the surface.

REFERENCES:
patent: 3378636 (1968-04-01), Hamilton
patent: 4253737 (1981-03-01), Thomsen et al.
patent: 4631214 (1986-12-01), Hasegawa

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