DK144746B - DEVICE FOR COLOR REMOTE VIEW SCREWS - Google Patents

Description

144746 i

The invention relates to a deflection unit for color television picture tubes in which the electron beam generating units necessary for producing the individual color components are arranged spatially apart from each other, preferably in one line, which deflection unit produces an electromagnetic deflection field and is an external field of diffraction. two perpendicular deflection fields for the electron beams perpendicular to the tube axis are produced with two independent deflection windings.

It is known from German publication no.

2 411 084, the magnetic fields for obtaining a good convergence must have a certain course at the two end sides of the deflection unit. Furthermore, it is apparent from this printing that in the case of a color television picture tube with, for example, three in a plane adjacent to each other electron beam generating units, which lie here in the horizontal - also called x-plane (y = 0) -, it must The magnetic field deflecting in the vertical direction at the front of the deflection unit is shaped barrel-shaped and at the rear cushion-shaped.

Forming of the magnetic field in the required manner can be achieved according to the known methods by appropriate selection of winding distribution in the z-direction of the deflection coils and by constructive measures with respect to the coil core, which generally consists of a soft magnetic material.

For the magnetic field acting in the horizontal direction, similar requirements as above apply to the magnetic field acting vertically, although with the difference that for the assumed configuration of the electron beam generating unit, the magnetic field here must be formed cushion-shaped at the front of the deflection unit and barrel-shaped at the rear. .

These requirements apply regardless of whether the bending unit consists of an arrangement of saddle coils or toroid coils or a combination of both coil species.

SUMMARY OF THE INVENTION It is an object of the invention to provide a deflection unit of the kind described in the preamble which meets the aforementioned requirements, but in which contrary to the previously known deflection units it is not necessary to intervene in said winding distribution and in the contour of the soft magnetic core.

This is achieved by inserting soft magnetic elements into the magnetic field at the rear of the deflection unit separate from the coil core, the soft magnetic elements being arranged symmetrically with respect to the longitudinal axis of the deflection unit and symmetrical with respect to the corresponding principal deflection axis (x, y, respectively). horizontal, vertical axis), and that at least the elements associated with one of the principal deflection axes lie in a plane perpendicular to the longitudinal axis of the deflection unit.

As an advantage over the known precautions, both of which are in practice used simultaneously, it has been found in the unit according to the invention that the desired result is obtained only by its use. This is advantageous both from a manufacturing point of view and with respect to the adjustment of the tolerances always present during assembly.

Especially with respect to the contour of the soft magnetic core contour, it is advantageous that during the winding or mounting of the coils, the position of the winding should not be taken into account in relation to the con- gestion change made - for example in the form of a recess .

According to an advantageous further development of the invention, the soft magnetic elements are arranged movable together and / or individually.

Thanks to these peculiarities, an adjustment or correction can be made selectively for each magnetic field direction.

The best possible adaptation of the magnetic field's practical course to the theoretical on the end sides of the deflection unit is known when the soft magnetic elements associated with the horizontal deflection direction are formed as ring segments and form a circular arc of approx. 90 °, that the soft magnetic elements associated with the vertical deflection direction are formed as element pairs, each parallel to the horizontal axis, (the x-axis).

The invention will now be explained in more detail with reference to the drawing, in which:

FIG. 1 shows an embodiment of a deflection unit according to the invention; FIG. 2a) to c) show three main forms of the course of a magnetic field.

The preparation of FIG. 1 schematically shows only the details of the deflection unit required for the understanding of the invention.

In coordinate systems, the x-axis represents the horizontal and the y-axis is the vertical of a color television picture tube and the z-axis is the longitudinal axis of the deflection unit or color television.

The embodiment shows the soft magnetic core 10 with the deflection windings 11, which are made here as toroid windings. The details of the field course of such a deflection unit do not need to be discussed here, since they are sufficiently well known; reference is only made to German publication no.

The deflection unit has a trumpet-like shape, with the large diameter end side facing the screen.

On the rear end side of the deflection unit 10, 11, soft magnetic elements are formed to form the magnetic field in the manner described so that barrel-shaped and cushion-shaped patterns are formed. The soft magnetic elements 21 and 22 are only intended to affect the field course of the horizontal deflection winding, ie. for deflecting electron beams in the x-direction.

As FIG. 1 shows the elements 21 and 22 are ring segments which are arranged in an x-y plane and consist of a soft magnetic material. The ring segments each form an arc of approx. 90 ° whose center is on the x-axis.

For influencing the vertical deflection field in the desired manner, the elements 31, 32, 33 and 34 serve.

These elements also arranged in an x-y plane are arranged in pairs 31 and 33 as well as 32 and 34 as rod elements parallel to the horizontal axis, ie. the x-axis.

In practice, this embodiment of the soft magnetic elements has proved advantageous.

5 14 me

It may now occur that during the manufacture of the deflection unit and the tube or during mounting in the television apparatus deflection errors occur, which necessitate a displacement of the elements 21, 22, 31, 32, 33 and 34 to correct the previously considered ideal field course.

For this purpose, the elements can be mounted movable, as is known to one skilled in the art, and in such a way that each element can also be moved individually.

By corresponding shaping, the elements shown here separately for each deflection direction can also be structurally combined, for example by joining the rod-shaped elements 31 and 32 with the ring element 21 and the rod-shaped elements 33 and 34 with the ring element 22.

The quantitative dimensioning of the elements and their spatial location affects the sensitivity of the arrangement and in addition depends on the deflection unit's and thus also the color path of the data tube.

In Figures 2a, 2b and 2c, the basic forms mentioned in the introduction are shown in the introduction; thus, FIG. 2a shows a pillow-shaped course; FIG. 2b shows a homogeneous process, and fig.

2c shows a barrel-shaped course.