SU50264A1 - Cathodic vision tube - Google Patents

Description

The present invention relates to a Brown tube, designed primarily for vision and covered from the inside with an electrically conductive layer (screen), which has its purpose to remove charges from the glass walls of the balloon. This electrically conductive layer is at a high potential relative to the anode of the tube, as a result of which it is also used to concentrate the cathode beam and accelerate the movement of its electrons. In accordance with the present invention, this inner layer is obtained by coating the walls of the can (from the inside) with electrically conductive coal, such as coal used to make retorts, in suspension in liquid glass.

Such an internal coating is carried out by approximately equal parts by weight of the sprayed

coal and water glass, preferably sodium liquid glass, and the subsequent application of this mixture to the inner wall of the flask. It is extremely advisable to keep the luminous screen in a heated state during the process of applying the electrically conductive layer (since the latter has been applied earlier), which prevents water from accumulating in it, a large amount of water glass contained in ordinary varieties and evaporating during smearing.

The inner coating of electrically conductive coal, in suspension in liquid glass, proposed in the present invention has the advantage that it completely absorbs the light rays reflected from the tube walls, as a result of which the entire screen brightness observed in the Brown tube with reflective . h external coating.

here is not the case. The coal and liquid glass coating adheres extremely tightly to the glass wall, which is a great advantage for tubes with a long service life. Moreover, such a coating composition is completely inactive with respect to the cathode material. When the tube is heated, which is unavoidable when it is sealed, the coating material does not emit gases that are harmful to the cathode or the glowing screen.

For making a well smearing the mixture of coal and liquid glass, you can take, as mentioned earlier, equal parts by weight of sprayed coal and soda liquid glass. The ratio of the elements of the mixture can be varied from 1:10 to 10: 1. With a large percentage of liquid glass, the mixture becomes too liquid, which leads to a rapid drying of the outer surface of the coating, leading to its rupture when it is dried by air bubbles enclosed between the glass and the applied layer. This is not eliminated by the high water content, since in this case the mixture ceases to adhere well.

with a glass wall, as a result of which a good quality of the coating becomes impracticable.

With a strong percentage of coal, the mixture becomes too dense, which is very hard, udn. em its application. In accordance with its dual purpose — the absorption of light rays and discharge of charges — the proposed carbon coating is applied, without the use of a metal layer, directly onto the glass wall of the cylinder, on the cylindrical and conical parts of it so that the cylindrical part is not covered over its length on which are the deflecting organs and the radiating system.

The subject matter of the invention.

Claims (2)

1. Cathode tube for vision, characterized in that its conical and cylindrical parts are covered with a layer of coal in suspension in water glass. 2. Application in the manufacture of the tube according to claim 1 suspension of coal in liquid glass in equal weight ratios of both sets.