DE2408673A1 - ELECTRON BEAM TUBE - Google Patents

Description

81-22.224PC22.225H) February 22, 1974

HITACHI, LTD., Tokyo (Japan)

Cathode ray tube

The invention relates to the construction of a cathode ray tube and relates to a cathode ray tube with a tube envelope having a neck portion, a has funnel-shaped section and a front disk section, an electron beam generator in the neck section, a luminescent screen in the windshield section and a deflection yoke.

In general, a cathode ray tube has a tube bulb, one or more electron guns or "electron guns", a fluorescent screen and a deflection yoke around part of the neck portion and a Part of the funnel-shaped portion of the tubular piston is arranged. To the electron beam with the deflecting To be able to regulate the magnetic field precisely, it is necessary to

81 - (POS 32 "538) -MeBk

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that the central axis of the deflection yoke coincides with the central axis of the shark section of the tubular piston, and that the yoke firmly with the named parts of the tubular piston ' connected is. In particular in the case of a color picture tube equipped with several electron beam generators the exact arrangement of the deflection yoke with respect to the tubular piston is of great importance.

In the manufacture of conventional cathode ray tubes, the deflection yoke on the tube piston is bonded with adhesives or attached with some mechanical device after adjusting the relative position between the yoke and the tubular flask. The surface of the tubular piston on which the yoke is attached, however, is smooth, so that the yoke can move easily.

It is therefore the object of the invention, in order to remedy the disadvantage mentioned, to provide a cathode ray tube, on which the deflection yoke can be secured in position, so that only insignificant color and image distortions occur can.

The object is achieved in that the deflection yoke by means of an adhesive on a part of the Circumference of the neck portion and part of the circumference of the is attached from the neck portion continuing funnel-shaped portion, and that the circumference of this part of the funnel-shaped portion is provided with an annular irregular surface, the central axis of which with coincides with the axis of the cathode ray tube, whereby the deflection yoke is secured in position on the tube piston.

The invention is therefore to a cathode ray tube that on the periphery of its funnel-shaped section with a

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annular irregular surface is provided, the central axis of which with the central axis of the cathode ray tube matches, whereby a deflection yoke can be reliably fixed in place on the tube.

The invention is illustrated with reference to the drawing Embodiments explained in more detail. Show it:

Fig * I is a side view of a cathode ray tube according to one embodiment of the invention with distant deflection yoke;

2 shows a rear view of a cathode ray tube according to another embodiment of the invention:

Fig. 3 is a side view of a cathode ray tube according to a further embodiment of the invention with the deflection yoke removed;

4 shows an enlarged detail of a part according to FIG Fig. 3;

Pig «5 shows an enlarged detail of a section of a cathode ray tube according to another Embodiment of the invention.

In Fig. 1, a cathode ray tube A is shown. To part of the neck portion la and part of the In the funnel-shaped section Ib of the tube piston 1 of the cathode ray tube A, a deflection yoke 2 is arranged. The sections mentioned merge into one another or are adjacent to one another. Part of the outer surface of the funnel-shaped Section Ib of the tubular piston 1 is roughened. The roughened surface 3 has a hoop-shaped or ring-shaped one Appearance which is substantially identical to the portion of the surface of the deflection yoke 2 that is in the assembled State brought into contact with the roughened surface 3

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will. The roughened surface 3 is preferably made simultaneously with the manufacturing process of the tubular piston 1 formed, but it is also possible, the roughened surface 3 after completion of the tubular piston 1 z. B. by Sandblasting to form.

The deflection yoke 2 is attached to the tubular piston 1, which has the surface structure described, the relative position to each other can be adjusted and an adhesive such as synthetic resin (not shown) in the gap between the piston tube 1 and the deflection yoke 2 to completely close the deflection yoke 2 with the piston tube 1 associate.

In this embodiment, in which the external shape of the funnel-shaped portion Ib of the tubular piston 1 is round, the roughened surface 3 has a hoop-shaped or ring-shaped one Appearance, however, in the case of a rectangular funnel shape as shown in FIG. 2, only surface sections 3 'of the funnel-shaped section Ib be roughened.

Fig. 3 shows according to another embodiment of the Invention a cathode ray tube A, in which a deflection yoke 2 around a part of the neck portion la and a part of the funnel-shaped section Ib of the tubular piston 1 is arranged, the sections merging into one another or are adjacent to each other. The above-mentioned portion of the outer surface of the funnel-shaped portion Ib is with a number of protruding ribs 4 are provided. Fig. 4 shows on an enlarged scale a detailed view of the ribs 4, in which the ribs 4 are diagonally opposed and arranged in a circular segment on the funnel-shaped surface are so that they correspond to the corresponding area of the

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Deflection yoke 2 can be connected. The ribs 4 become formed on the tubular piston 1 simultaneously with the manufacture of the tubular piston 1.

Pig. 5 shows another embodiment of the invention, arranged in the corrugated projections 4 'instead of the protruding ribs 4 of the embodiment according to FIGS are. With this structure, the same result can be achieved.

According to one of the structures shown in FIGS the deflection yoke 2 is first attached to the tubular piston 1, then the relative positions are adjusted to each other and a (not shown) adhesive e.g. B. Polyamide resin is used in that formed between the tubular piston 1 and the deflection yoke 2 by the protruding ribs 4 or corrugated projections 4 ' Injected gap, whereby the deflection yoke 2 is reliably attached to the tubular piston 1.

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Claims (5)

_ ₆ _ 2403673 Patent claims Iy cathode ray tube with a tube that is a neck portion, a funnel-shaped portion and a front pane section, an electron beam generator in the neck section, a luminescent screen in the Front window section and a deflection yoke, characterized in that the deflection yoke (2) by means of an adhesive on part of the circumference of the neck portion (la) and part of the circumference of the funnel-shaped section (Ib) continuing from the neck section (la) is attached, and that the circumference of this part of the funnel-shaped section (Ib) is provided with an annular irregular surface whose central axis coincides with the axis of the cathode ray tube (A) matches, whereby the deflection yoke (2) is secured in position on the tubular piston (l). 2. Cathode ray tube according to claim 1, characterized in that the uneven surface has an annular shape roughened surface (3, J ') is (Fig. 1). 3. Cathode ray tube according to claim 2, characterized in that the annular roughened surface is divided into roughened surface ^{sections (3 f} ) (Fig. 2). 4. Cathode ray tube according to claim 1, characterized in that the uneven surface by a number diagonally opposite protruding ribs (4) formed on the circumference of the funnel-shaped section (Ib) is formed (Fig. 3, 4). 409836/1007 5. Cathode ray tube according to claim 1, characterized in that the uneven surface is formed by corrugated projections (4 ¹ ) formed on the circumference of the funnel-shaped section (Ib) (Fig. 5). 409836/1007