DE2459190A1 - METHOD OF SUPPORTING A DEFLECTOR ON A CATHODE BEAM TUBE - Google Patents

Description

VIDEDN

95, rue d'Aguesseau

92 - BOULOGNE Dec. 3, 1974

V-PA-Oi 2

PATENT APPLICATION

Method for mounting a deflection device on a cathode ray tube

The present invention relates to a method for the presettable mounting of a deflection device, in particular a deflection and convergence unit,.

on a cathode ray tube for a television receiver using a retaining ring attached to the funnel portion of the tube.

In the manufacture of television receivers, the deflection device is part of the optimum setting the deflection and convergence unit on the neck of the picture tube, numerous individual adjustments are necessary. This slows down and makes production considerably more expensive. This applies in particular to the manufacture of color television receivers, because here a larger number and more precise settings to achieve the image sharpness and color purity are required. As is well known, it must be achieved that the basic colors red, green, blue corresponding electron beams the corresponding

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Hitting luminophores absolutely precisely in the center · This basically applies to all types of tubes.

At present, in order to achieve this goal, a certain number of successive settings must be made the static and dynamic convergence, ■ the color purity and the exact position with respect to the three dimensions when assembling the deflection device of the deflection and convergence unit on the Picture tube must be observed and carried out. The deflection device contains a solid mechanical one Frame for adjusting and holding the deflection coils on the funnel and / or neck part of the picture tube. Some of these settings influence each other so that these setting processes are mutually exclusive need to repeat frequently. The aim of these settings is the exact coincidence of the ideal deflection planes of the electron beams in the picture tube for this as well as for the deflection unit

The invention was therefore based on the object regardless of the fastening method for the deflection unit to specify a method that avoids the mentioned shortcomings and disadvantages by avoiding manual Adjustment steps during or after the final assembly of the deflection unit are more necessary.

According to the invention, this object is achieved for the preamble according to the characterizing part of the main claim.

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-Q-

- 3.

Further details can be found in the dependent claim and the description of an exemplary embodiment will.

The invention thus consists in principle in that the two ideal deflection planes of picture tube and deflection unit be brought to congruence by a to be attached to the funnel part of the picture tube, known Retaining ring initially adjusted by means of a selected deflection unit at the tube manufacturer's plant, is marked and attached. If at the television set manufacturer according to the ideal deflection planes marked deflection units and picture tubes with retaining ring are assembled by mutual Markings on the stop surfaces must be observed have been attached, then, as required, the ideal planes of deflection come into congruence and make it superfluous readjustments.

The invention can be applied to any cathode ray tube / deflector convergence unit system can be used regardless of the type of tube and deflector, and especially for in-line tubes with a slit mask, the with a deflection device with a convergence device in the same plane as the deflection unit are connected. Indeed, in this case there is the interdependence between purity and convergence lower and also the purity setting is on a horizontal one due to the slits in the mask Adjustment simplified.

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- «- 2A59190

Based on the drawings, the basic function of the method is described below, as well as an embodiment given as a simplified example.

FIG. 1 shows, in longitudinal section, a cathode ray tube with an electron beam drawn in for determination the ideal deflection plane.

Figure 2 illustrates the photographic attachment of the Luminophores in the manufacture of a color cathode ray tube.

FIG. 3 shows, in longitudinal section, a deflection device with an electron beam for specifying the ideal Deflection reference plane.

Figures 4 and 5 illustrate a possible form of embodiment in which the tube and deflection provided markings consist of stops (butees), which should come to congruence - as shown in figure.

In Figure 1, the numerals 1, 2, 3 and 4 denote the shell, the screen, the shadow mask and the electron guns, respectively a cathode ray tube. The ideal deflection plane AB of the electron beams is indicated by the dashed line Line 5 shown.

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This ideal plane 5 is the plane perpendicular to the longitudinal axis of the cathode ray tube, which passes through the center of the Beam deflection goes. In practice, this center of distraction is not a point and it can be defined as one The location of the distraction centers and optimize this location to determine the ideal plane. This optimized level can in fact already be achieved with the tube assembly will.

In fact, in the process of placing the luminophores on the faceplate (Fig. 2), the arrangement of a UV radiation source 11 and an optical scattering system 12, which by photo printing the Luminophores attached to the screen 13, exactly where it is determined by the mask 14. Then a rear one Objective focal point for the optical scattering system 12 is determined. The ideal deflection plane is the plane that is perpendicular stands in relation to the longitudinal axis 15 and passes through the optical focal point 16. In these circumstances you can get the ideal Mark the deflection plane very precisely and put a label on each cathode ray tube indicating its position can be defined extremely precisely in relation to the electronic optics.

Figure 3 shows schematically the longitudinal section of a deflection device B, in which an electron beam 8 is deflected according to a certain curve. Theoretically is it is known that the ideal deflection point of the electron beam is point 7, where the tangents to the electron beam converge before and after the distraction.

-B-

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To materialize this ideal center of distraction, an electronic means is used in practice,
e.g. a system of field probe research with Hall effect or, even more simply, a cathode ray tube prototype Cetalon = also comparative, normal),

In the latter case one proceeds with a cathode ray tube system with deflection / convergence unit as follows:

This deflection / convergence unit is placed on the comparison tube, which has a mark such as
mentioned above. If the setting is exact, ie if the two ideal deflection planes coincide, a marking is made on the actual deflection device
Deflection / convergence unit attached, which coincides with that of the cathode ray tube. With this assumption, the required deflection position within the unit deflection / convergence is with respect to the position of the cathode ray tube through the marking
finally marked on the deflection unit.

From what has been said above it can be seen that it is possible to make two line markings without difficulty, one on the cathode ray tube, more precisely on or on the stops 10 on the attached retaining ring 9
and the other on the deflector proper
of the deflection / convergence unit B. For example, when manufacturing the receivers, it will be sufficient to bring these two marks together in order to enable the exact setting of the deflection device B of the deflection / convergence unit without further adjustment.

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unit on the flask 1 to get. your connection (Attachment) can be done by any means will.

In an exemplary embodiment given here, there is the marking on the cathode ray tube from a set of stops 9, 1G in Figure 4 on the conical Part 1 of the tube. These stops 9, 10 are extremely precise Distance from the ideal deflection plane AB of the electron beams arranged in the cathode ray tube, as defined, for example, in the description above. The mark on the deflector 6 of the deflection / convergence unit can consist of stops intended to come into contact with those of the tube. So when the stops of the deflection device in the deflection / convergence unit with the stops of the cathode ray tube are brought together, there is certainty that the corresponding planes of deflection of the rays coincide exactly as in FIG.

In order to achieve a precise setting of the stops 9, 10 in the To get pipe or deflection control, you can use tight-fitting wheel chocks that stop on a base are glued, use or a screw adjustable stop or any other that agent producing the same effect.

The given embodiment also shows the advantage the centering of the deflector / convergence device with respect to the cannons of the tube in a perpendicular

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to allow plane standing to the longitudinal axis of the tube.

Of course, all can within the scope of the invention Variants are carried out, specifically as to the number, arrangement and shape of the markings used regards. With this in mind, one could also use a pawl system that holds the cathode ray tube and the actual deflection device of the Ablonk / convergence unit in relation to each other directly adjusts.

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Claims (2)

Patent claims : ζ 1 .J Method for presettable mounting of a deflection device, in particular a deflection and convergence unit on a cathode ray tube of a television receiver, using a retaining ring attached to the funnel part of the tube, characterized in that the method consists of the following three steps: A. The retaining ring is pre-attached to the tube using a selected pattern deflector provided on or near its perimeter with markings that are both parallel are attached to and at a certain distance from the ideal deflection plane in the axial direction, as well as the position of a rotary adjustment around the Hold the longitudinal axis of the tube. B. Any deflection unit to be installed later is made using a selected sample picture tube with a fixed and marked retaining ring also provided with corresponding markings in exact relation to the ideal deflection plane. . C. Any deflector will be used in the final Assembly with exact adjustment to the markings on the one provided with the retaining ring Picture tube attached. - 10 - 509832/0666 2. The method according to claim 1, characterized in that that the two parts to be fastened to one another according to the markings are fixed and / or movable matching stops or adjustable notches, recesses, slots and / or Own grooves. 509832/0666 Blank page