DE1288692B - Convergence device for the beam generator system of a cathode ray tube - Google Patents

Description

1 2

The invention relates to a convergence device beam generation system and the arrangement for since for the beam generation system a cathode ray borrowed convergence in a plane 3-3 of FIG. 1.
tube with three electron beams and three in one In F i g. 1 shows, for example, a direct view color equilateral triangle around the central axis of the tube television picture tube of the shadow mask type, arranged axially parallel to this and carried by insulating 5 in which the inventive device used support rods, tubular elec- tric can be. The tube 10 has a piston with troden. a neck 12, a cone 13 and an end plate;

The invention is based on the object of providing a 14 and a pinch foot 15. In the pinch foot 15, the electrode holder is fused into the pinch foot 15; he helps to train that through it at the same time the magnetic flux ίο also an orientation disk 17. On the way for the generation of the beam axes through the inner surface of the face plate 14 is a setting magnetic correction fields formed; Mosaic phosphor screen 18, the aluwerden in a conventional manner, may be mini Siert "Before the luminescent screen. ^18: befin-Zur \ achieve this object, at a convergence to a broken shadow mask 20 det, according to the invention in genzemrichtung of the type mentioned 15 tube neck 12 is located a uniform beam provided that three end to end in the form of a generating system arrangement 22, the three separate triangles arranged, as pole pieces with the converging electron beams, which run through a deflecting magnetic area 24 cooperating to the mosaic screen 18. The Ablen mounting strips with Their respective adjacent action of the beams is carried out by deflection coils 25. The ends at the corners of the triangle in each of the 20 individual beam-generating systems are, as are fastened in insulating support rods and, as shown in FIG. 3, the three in a triangle or delta arrangement Electrodes on the outside of the strip- symmetrical about the central axis d he tube 10 is arranged triangularly and each arranged on one of the mounting brackets. In Fig. 1 only two of the three systems are attached to strips between the ends of which are attached. see.

This ensures that for the generation of the 25 The three systems each contain a cathode magnetic correction field no additional, of arrangement 26, a control grid 27, a screen grid 28, of the electrode holder separated magnetic a focusing electrode 29 and an anode 30, the Components must be provided so that they are all axially aligned, at a distance Constructive of each other on three insulating support rods 32 required for the beam generator system Effort is reduced accordingly, which strengthens the pre-30, which can consist of glass, for example, has part that the beam generator system is smaller. From Fig. 3 it can be seen that the three insulating and can be made more compact, consequently the tubular rods 32 in pairs outside of the individual Neck can be narrower and the deflection yoke run according to systems. In Fig. 1 is just one of the wands can be made smaller, what a better 32 can be seen. The focusing electrodes 29 are attached to the allows controllable distraction. 35 rods 32 by the magnetic according to the invention

According to one embodiment of the device mounting strips 34, which also serve as pole shoes for According to the invention, the retaining strips each serve the lateral convergence, fastened as in clubs the corresponding electrode receiving, binding with F i g. 2 and 3 described in more detail concave inwardly curved central section and becomes. The anodes 30 are over against the rods 32 two opposing directions 40 non-magnetic strips 35 attached, the similar ge-end sections, which are each shaped with their ends in the like the strips 34 ". ' The corresponding cathode assembly insulating support rod attached voltage 26, the control electrode 27 and the screen grid are on, and the electrodes are each from the outside 28 are on the rods 32 via strip-like tabs attached to the curved central section of the relevant holding device 42.

fastening strip attached. The two 45 The filaments 48 of the cathodes can be through a End portions of the individual mounting strips held in subdivided, annular strips 50, the is attached to the insulating support rods 32 at an angle of approximately 120 degrees with respect to one another. stand. On the anodes 30 is a convergence cage 44 for

In a further development of the invention, the magnetic dynamic convergence of the electron beam arrangement contains two magnets, each attached with a pole in 50, which interacts and arranges with a magnet arrangement 46 located outside the piston near one of two corners of the strip triangle are, as well as a magnetic component that maintains the convergence of the three electron beams - Magnetftußweg between that of the third corner of the while these the fluorescent screen 18 corresponding strip triangle opposite electrode and accordingly scan the usual grid,
forms the two poles of the two magnets. 55 The lead-in ladder 16, which at the same time

The invention is now to form on the basis of an execution pin, lines are connected to the associated electrodes in more detail via connection example (not shown) in conjunction with the drawing, explained. It shows an electrically conductive layer 52 on the inner wall

Fig. 1 is a partially shown in axial section of the widening part 13 of the tubular piston Side view of a tube, parts of which are broken away 60, extends from the fluorescent screen 18 to the neck 12, where with the convergence device (according to which it makes contact with a number of spring fingers, finding); The voltage for the second anode is the layer

2 shows an enlarged perspective view 52 of a feedthrough which is only shown schematically magnetic strips supplied to hold the focuser 56; so this tension is due to the Electrodes which also act as pole pieces of the convergence 65 anodes 30, the convergence cage 44 and the Establishing the beam generating system arrangement, fluorescent screen 18.

in the case of the tube according to FIG. 1 serve; The F i g. 2 and 3 show the attachment of the

3 shows an enlarged cross section through the focusing electrodes 29 on the insulating holding

Rungsstäben 32 and the beam convergence device according to the invention. The three focusing electrodes 29 are each attached to one of the mounting strips 34, which at the same time forms a magnetic pole piece 34 for the lateral convergence and therefore from one magnetic material.

As shown in Fig. 2, the strips 34 comprise one bent middle part 86, which receives the electrode, and two end parts 88. The end parts 88 are bent so that that they diverge at an angle of about 120 degrees. These end parts are E-shaped Cutouts are provided which form a number of projections 90 which are inserted into the insulating support rods 32 can be embedded.

Like F i g. 3 shows, the three magnetic support strips are arranged in the shape of a triangle and the adjacent ends of two different strips are each adjacent to each other in the same Retaining rod 32 embedded. The three retaining strips 34, which simultaneously act as pole shoes, are oriented so that the concave side of their central sections intended to receive the electrodes 86 point outwards. On the outside of the strips are accordingly the three tubular ones Focusing electrodes 29 mounted; so they lie outside the triangle formed by the strips. Since the electrodes are outside this triangle, the strips shield the three electrodes magnetically against each other.

Outside the neck 12 of the cathode ray tube there is a magnet arrangement 92 (FIG. 3) which interacts with the three parts 34 acting as retaining strips and as pole shoes. The magnet arrangement 92 essentially contains two bar magnets 94 which, with poles of the same polarity, adjoin two of the corners 95 of the triangle formed by the strips 34. The two poles of the other polarity point radially outwards. One of the bar magnets 94 or both can be magnetized permanently and / or electromagnetically by a pair of coils 96. The bar magnets 94 and the coils 96 present in this example are held by a magnetic strip 98 which has openings through which the bar magnets 94 extend. The fastening strip 98 extends between the magnets 94 so that at least a portion of it is adjacent to the tubular electrode 29 which is on the side of the strip triangle opposite the corner 99. The fastening strip 98 preferably rests on the tube neck 12 and is fastened to it by a tension spring 100.

The magnets 94, together with the strips 34 serving as holders for the focusing electrodes 29 and as pole pieces, form magnetic circuits , as shown by the flux lines 102, 104 and 106 . The flux emanating from magnets 94 enters the ends of strips 34 via flux paths 102 . Some of the flux is directed from the upper strip to the upper focusing electrode 29 and then passes through the free space along path 104 to the attachment strip 98, through which the flux is directed back to the magnets 94. Another part of the flux is directed through the lower strips 34 near the two lower focusing electrodes 29; it then runs along the paths 106 through the free space to the support strip 98, through which it is guided back to the magnets 94. The flow is through the upper focusing electrode in the opposite direction as through the lower two focusing electrodes. The electron beam passing through the upper focusing electrode is accordingly deflected in one lateral direction, while the beams passing through the two lower focusing electrodes are deflected in the opposite lateral direction. This opposite lateral deflection allows maximum convergence sensitivity to be achieved.

If the correction of the lateral convergence has to be done in the other direction than the one in F i g. 3 causes the magnets 94 in the fastening strip 98 turned around. This changes the direction of flow and, accordingly, the direction of the lateral ones Beam deflection.

Instead of being exactly radially outside the triangular corners 95 as shown, the magnets 94 can instead also be displaced away from the corners 95 in the circumferential direction of the neck 12 in order to achieve a desired shape of the magnetic field within the tubular electrodes 29. So when it is said that the magnets 94 are located in the circumferential direction next to the corners 95, this is also intended to include arrangements in which the magnets 94 are displaced in the aforementioned manner.

The coils 96 can either be fed with direct current or with a current which is variable over time so that the lateral convergence is maintained either statically or dynamically.

Claims (4)

Patent claims: 1. Convergence device for the beam generator system with a cathode ray tube three electron beams and three in an equilateral triangle around the central axis of the tube axially parallel to this and carried by insulating support rods, tubular Electrodes, characterized in that three arranged end to end in the form of a triangle, as pole shoes with the Convergence magnet arrangement (92) cooperating magnetic retaining strips (34) with their respective adjacent ends at the corners of the triangle in each of the insulating support rods (32) are attached and that the three electrodes (29) on the outside of the strip triangle arranged and each attached to one of the mounting strips between its ends are (Fig. 2 and 3). 2. Device according to claim 1, characterized in that the retaining strips each have one the corresponding electrode receiving, concave inwardly curved central section (86) and two end portions (88) extending in opposite directions with their ends (90) are each fastened in the corresponding insulating support rod, and that the electrodes (29) each from the outside on the curved central section of the respective mounting strip are attached. 3. Device according to claim 2, characterized in that the two end sections (88) the individual mounting strips are at an angle of about 120 ° to each other. 4. Device according to one of the preceding claims, characterized in that the Magnet assembly (92) two magnets (94), each with a pole near one of two corners (95) of the strip triangle are arranged, as well as a magnetic component (98) which contains a Magnetic flux path between the one opposite the third corner (99) of the stripe triangle Electrode and the two poles of the two magnets. For this 1 sheet of drawings