Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Patent
1983-10-03
1985-11-05
Childs, S. L.
Coating processes
Electrical product produced
Fluorescent or phosphorescent base coating
427157, 427162, 4273978, B05D 506, B05D 512
Patent
active
045513562
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is with respect to a process for forming an anti-reflecting layer on a viewing screen, which without such a layer would be the cause of trouble on viewing because of reflected rays coming from the screen.
ACCOUNT OF THE PRIOR ART
The undesired effect of light reflected by a viewing screen is something which may be experienced every day even in the home. However viewing screens, as for example in the form of CRT's, are becoming more and more important in other fields as well, as for example in offices, in industrial plant, for scientific work, in traffic systems, as for example in connection with airlines, and in closed circuit TV systems for the observation of persons and places, in which case as well troublesome reflection effects are likely. The cause of such effects is light coming from a badly designed lighting system and reflected at the viewing screen, such reflected light then making it harder to see the picture or image on the screen. This is likely to be a source of trouble for the viewer, possibly in the form of pains in the eyes and head and there is a strong feeling of generally being unwell, so that if the person in question is at work he will do very much less well.
There have certainly been enough attempts at stopping completely or in any event cutting down the reflexion of a viewing screen, as for example by "dereflecting" of "demirroring" it, and one way of doing this is by putting on a thin layer of a transparent lacquer. However, coatings produced by lacquers designed for this purpose are not resistant to chemical and mechanical cleaning materials. Again, another suggestion has been to have an uneven but regular surface on the viewing screen itself or to have a front screen (with such a surface on it) fixed in front of the viewing screen, such a fine, regular but uneven surface then dispersing the rays which would otherwise be reflected. In this case the thing reflected will no longer be made out or at any rate will not be seen clearly. Making such a uneven, regular structure on the surface of the front screen or the viewing screen itself is however a relatively complex process. A front screen may be flat so that on using it with a curved viewing screen the distance therebetween will not be the same at every point and the viewing screen image itself will be unclear. To take care of this trouble, one design of front screen has been put forward in the past that was etched on the one or two sides thereof, it having a spherical curvature in keeping with that of the viewing screen; if the front screen was only etched on one side, this side was then turned towards the viewer, see German Offenlegungsschrift specification No. 2,723,788. However such a front screen may not be used with viewing screens not having the same curvature.
In keeping with a further known suggestion the reflecting effect was to be put an end to by having a net on the screen, see German Offenlegungsschrift specification No. 2,712,321. However the net mesh size was at the most equal to the spacing between the image elements themselves. In a direction normal to the line direction this spacing was equal to the line spacing, and in the line direction the spacing was dependent on the upper frequency limit of the transmitted video signal and the size of the viewing screen. It was best for the net to have a dark color and for it to be made of elastic threads. Although being able to be used on any viewing screen, such a net readily took up dust and did not give the full desired anti-reflecting effect.
ACCOUNT OF THE INVENTION
One purpose of the present invention is that of designing a process which, while being simple and being able to be undertaken cheaply, at the same time gives a highly efficient anti-reflecting layer on a viewing screen.
In keeping with the invention, and for effecting this and further purposes: of an aqueous suspension having the property of reacting with the varnish and containing a silicate or a silicic acid screen at its outer face.
Herein the wordin
REFERENCES:
patent: 2428357 (1947-10-01), Cohen
patent: 2689804 (1954-09-01), Sadowsky
patent: 2707687 (1955-05-01), Lockwood et al.
patent: 3326715 (1967-06-01), Twells
patent: 3526530 (1970-09-01), Sams et al.
patent: 3635751 (1972-01-01), Long et al.
patent: 3940511 (1976-02-01), Deal et al.
Childs S. L.
Heiz Therese
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