DE704365C - Electron beam tubes for television - Google Patents

Description

GERMAN EMPIRE

ISSUED ON MARCH 28, 1941

REICH PATENT OFFICE

PATENT LETTERING

M 704365 CLASS 21g GROUP 13

R 93517 VW Φι g

Radio Corporation of America of New York, V. St. A. Cathode ray tube for television

Patented in the German Reich from June 4, 1935 Patent granted February 27, 1941

is used.

The invention relates to a cathode ray tube for television · with a vessel part supporting the conductive wall covering and a piston crown serving as a seal, which are fused together.

So far there have been great difficulties in getting the conductive coating on the pipe wall and to apply the luminescent layer to the piston crown. From the manufacturing point of view to off it is impractical to apply the silver clag first, as it is then difficult is, the liquid from which the phosphor is deposited on the piston crown, insert into the tube. So up to now, you have therefore first put the luminescent material on the piston crown and then the silver coating applied to the tube wall.

Up to now, the silver plating has usually been carried out in such a way that the whole KoI-ben turned slowly while holding at such an angle that when the certain Amount of Versüberungslösung was put on the tube wall, just the one Part of the piston that was to be silver-plated that was in contact with the liquid. This But Vei-drive had the disadvantage that the aqueous solutions on the end bottom of the Tube dripped and this for its intended use z. B. as a light screen base, rendered useless.

If, as known per se, the tubular flask was assembled from different dividers, could no neatly delimited inner coatings on the parts to be connected, e.g. B. on the conical tube part and the flat piston head, since clic individual parts are not suitable containers for the liquids to be used.

These disadvantages are eliminated by the present invention. According to the invention are in a cathode ray tube for television with a conductive wall covering supporting vessel part and a piston crown serving as a seal, which together are fused, the two parts where the fusion took place after bent inside the tube.

Due to the specified design of these parts, containers for the liquid to be used are obtained in a simple manner. The coating "is exactly limited to the designated area by the constriction. Therefore, the coatings can be uniformly and apply without loss of material one can. ^R> 5 thus continue to produce with much less trouble a piston crown having a uniform optical surface. .

In the tube of the present kind, the 6 » standing constriction can be used to hold an electrode.

The invention will now be described in more detail with reference to the figures.

Claims (2)

The tube according to Fig. Ι consists of the piston ι made of glass or possibly also of metal with the neck part 2 and the conical toilet 3. This part 3 and a toilet> of the neck are clad, for example, with a silver layer 6, while the bottom of the Tube is covered with fluorescent material 10. The system for generating a beam, which is not the subject of the present invention, consists of the following parts: cathode 22 with heating filament 24, control electrode 26 with disk 28 which is provided with a hole 30, anode part 32 with disks 34 (with hole 46 ) and 36. The part 32 is supported by the control electrode 26 by wires 40 and glass beads 3 S as well as a retaining ring 42 between the grid and anode. The Fig. Ι also shows the fiction, contemporary design of the tube piston, in 'which both the piston head 4 with the lining ι ο and the conical part 3 of the tube with the conductive wall lining 6 are bent at the connection point to the inside of the tube. The leucine screen base is designed as an independent part, as shown in Fig. 3, for example. The fluorine-based fuel 10 is applied to this base while it is still separated from the actual flask. With such a production, the disadvantages previously associated therewith do not occur when the phosphor is applied. If such a base according to Figs. 3 and 4 is placed in the place of the base 4 of Fig. 2, there is the further advantage that optical imperfections are avoided, which often occur in the end base when it is off with the piston blown in one piece. Furthermore, by making the base independently of the bulb, special glass parts can be used either as luminous screens or as optical lenses. If, for example, the floor according to Fig. 3 is made of high-quality glass and a special glass composition is used for the central parts of the shade, considerable savings can be made in manufacture, since then the entire calving does not have to be made from high-quality glass. If the piston is provided with transition parts, as indicated in Figs. 1, 3, 4, 5 and 6 with S and 9, these parts will expediently be given expansion coefficients which increase or decrease with respect to the coefficients of the conical part 3 and the bottom 4 are. When the tube is being completed, as can be seen from Fig. 5, the two parts 3 and 4 are fused together on a glass bench by placing the conical part 3 in one rotatable head and the base 4 in the other rotatable head this bank is being held. The edges 7 and <S of parts 3 and 4 are heated by <> ■ the flames 12, 13, 14 and 15 and fused together. Then compressed air is expediently introduced into the neck part 2 of the piston, whereby the processing of the plastic glass is facilitated. This / <results in a more uniform glass structure at the melting point and thus reduces the stress that follows the solidification and cooling of the glass. The above-mentioned constriction 5 serves to limit the contact surface of the solution from which the metal screen 6 is deposited. To form this constriction, the part 5 is heated by the flames 12, 13, 14 and 15 and, after melting, while the glass is still plastic, an appropriate tool made of coal or some other stud is pressed against the glass bulb. As a result, the piston assumes the shape shown in dotted lines in Fig. 5 and drawn in Fig. 1. This constriction is now used in the AiH guide form according to FIG. 6 to hold the auxiliary elements 50 and 52. The element 50 can be, for example, a musaik chirin or an auxiliary anode, while the element 52 can be used to carry the element 50 or for any other purpose Tube one must make sure that the flames do not wash directly the screen 10. Patentansi'uüciie:. 1. Cathode ray tube for television with a conductive wall covering supporting vessel part and a piston crown serving as a seal, which together are fused, characterized in that the two parts where the fusion took place after are bent inside the tube. 2. Cathode ray tube according to claim 1, characterized in that the through Fusion of the two parts with the edges bent towards the inside of the tube resulting constriction of the tube wall for holding an electrode, e.g. B. an auxiliary anode or a mosaic screen, serves. 1 sheet of drawings