JPS5843857B2 - In-line color picture tube device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-line color picture tube device comprising an in-line color picture tube and a deflection device that deflects an electron beam in horizontal and vertical directions to form a scanning raster. This is a so-called automatic concentration type color image receiving device in which three electron beams are automatically concentrated substantially on a phosphor screen,
Furthermore, it is an object of the present invention to provide a new in-line type color picture tube device in which raster distortion is reduced to a large degree and substantially no distortion correction is required.

As shown in Figure 1, the in-line color picture tube device has rectangular coordinate axes as the Z-axis, Y-axis, and Z-axis, and has long sides and short sides that are approximately parallel to the Z-axis and Y-axis, respectively. A phosphor screen consisting of phosphor strips of three colors approximately parallel to the Y axis is formed on the inner surface of the glass panel 1, and further behind a shadow mask 2 having a large number of openings as a color selection electrode. In-line electron guns 3 are locked at a predetermined gap and further behind the in-line electron guns 3 are arranged in a line along the Z-axis direction.
are arranged to form an in-line color picture tube, and on the outside of the funnel cone portion 4 of this picture tube there is a deflection yoke 5 for electromagnetically deflecting the electron beam group emitted from the electron gun in the Z-axis and Y-axis directions. It is located.

The deflection yoke 5 is usually composed of at least a pair of horizontal coils, a pair of vertical coils, and a deflection yoke core, and it is well known that the concentration characteristics of the electron beam group are almost determined by the magnetic field generated by the deflection yoke. be.

In order to facilitate understanding of the present invention, some explanation will be given below regarding the concentration characteristics of the color picture tube device and the magnetic field characteristics of the deflection yoke.

As shown in FIG. 2, when the electron beams 6B and 6R emitted from the electron gun 3 pass through a common deflection magnetic field and reach the phosphor screen 7, a concentration error occurs, and the concentration point 8 of the electron beams 5B and 5H occurs.
becomes a trajectory 9 curved toward the electron gun.

To explain in more detail, both side beams 5B, 5H
The focal point 8 and the central beam 10 do not necessarily coincide, and so-called 217 aberration usually occurs.

If this phenomenon is reproduced in the pattern of the phosphor screen L, it will become as shown in FIG.

In general, when discussing the concentration characteristics of a color picture tube device, the magnetic field design of a deflection yoke, etc., it is easier to understand, although it is qualitative, to use such a pattern of the phosphor screen -L.

In the figure, R, G, and B in the center of the screen are different from the fluorescence direction side, and the electron gun arrangement is different.
The △ mark indicates each node of the red R beam.

In order to perform accurate image reproduction in a color picture tube device, it is necessary to concentrate the three electron beams over virtually the entire surface of the phosphor screen E. Conventionally, correction circuits and the like have been used to perform moving point concentration correction. However, recently, an automatic focusing method has been developed that takes advantage of in-line electron guns and uses a special Asteig magnetic field for the deflection yoke magnetic field to virtually concentrate three electron beams onto the phosphor screen. Color picture tube devices are the mainstream.

Regarding automatic concentration, it is well known that the horizontal deflection magnetic field 11 can be made into a bottle cushion shape, and the vertical deflection magnetic field 12 can be made into a barrel shape, as shown in FIGS. 4a and 4b. Assuming that the tube axis of the color picture tube is the Z axis, the horizontal deflection direction is the Z axis, and the vertical deflection direction is the Y axis, the pincushion magnetic field 11 has a magnetic field distribution on a plane perpendicular to the tube axis as shown in FIG.
As shown in b, on the X-axis A, -A' increases as the axis moves away from the center, and at the same time, the magnetic field B-B' measured along the X-axis direction from a point away from the center by an arbitrary distance in the Y-axis direction. A similar tendency is shown, and the C-C/magnetic field measured along the Y-axis direction from a point separated by an arbitrary distance in the X-axis direction decreases with the off-axis distance, contrary to the above.

Similarly, the barrel-shaped magnetic field has completely opposite characteristics to the bottle cushion magnetic field, as shown in FIGS. 5c and 5d.

In FIG. 5, Bx and By indicate magnetic field strengths in the Z-axis and Y-axis directions, respectively.

Next, some explanation will be given regarding the deflection yoke magnetic field and automatic concentration using the pattern of three electron beams on the fluorescence m.

FIG. 6 shows a pattern when the horizontal and vertical magnetic fields are uniform, and the three electron beams 13B, 13G, and 11 are overconcentrated in the horizontal direction on the horizontal, vertical, and diagonal axes.

This corresponds to the trajectory of the concentration point shown in FIG. 2 above.

As can be seen from the figure, the trajectories of three electron beams simultaneously along the vertical edge 14 B y 14 G y 14 R
cross each other, resulting in a so-called "reverse loss" state.

Next, when the horizontal deflection magnetic field is made into the bottle cushion shape, as shown in FIG. As a result, the distance between the electron beam boxes 15B and 15H gradually narrows, resulting in a change in the direction of concentration.

Here, there is a central beam 15G and both side beams 15B.

Of course, the relationship with 15R is not necessarily constant due to so-called coma aberration.

On the other hand, when the vertical magnetic field is shaped into the barrel shape, it acts to give negative isotropic astigmatism to the three electron beams 16B, 16G, 16R along the vertical axis, and the distance between the electron beam spots 16B, 16R gradually increases. This will lead to a situation where there is a lack of concentration.

When the horizontal and vertical magnetic fields are simultaneously superimposed and the electron beam is deflected in the direction of the diagonal axis, the concentration characteristic at the end of the diagonal axis cannot be determined unconditionally because it varies depending on the deflection angle of the color picture tube device, the screen size, etc. Since this is not possible, we are using an arbitrarily designed deflection yoke to observe the concentration characteristics on the fluorescent part, and are attempting to optimize the magnetic field by making practical and experimental modifications.

From the above explanation, the in-line color picture tube device can concentrate at least both side beams on the phosphor screen by making the horizontal deflection magnetic field into a bottle cushion and the vertical magnetic field into a barrel shape. In addition, it is necessary to correct the coma aberration.

This coma aberration causes the magnetic field distribution on the electron gun side 17 and the phosphor screen side 18 of the deflection yoke to have opposite polarities (for example, in a horizontal magnetic field, the electron gun side is barrel-shaped and the phosphor screen side is in a bottle cushion shape), as shown in FIG. Overall, this can be corrected by making the horizontal magnetic field a bottle cushion shape and the vertical magnetic field a barrel shape, but in an actual color picture tube device, the phosphor screen side of the vertical coil needs to be shaped into an extreme bottle cushion shape. The left and right raster distortion becomes very large, for example, about 1 in a 110° tube.
This is about 5%, which is a drawback that cannot be corrected by a correction circuit made of inexpensive passive elements.

As shown in Figure 9, in the case of an in-line color picture tube device, the raster distortion has a winding shape (bottle cushion shape) for both the top and bottom as well as the left and right raster distortions.In particular, since the vertical magnetic field is barrel-shaped, the left and right raster distortion is vertical and horizontal. It is customary for the raster distortion to be sharper than the raster distortion.

Another method for correcting coma aberration is to use a so-called field controller, which increases the flexibility in setting the deflection yoke, and as a result, even with a magnetic field as described in Section 101, three beams are sufficient. It has the advantage of automatically concentrating the electron beam, and furthermore, the left and right raster distortion is approximately 8% for a 110° tube and approximately 5% for a 90° tube, which is sufficiently suppressed to a range that can be corrected by a circuit consisting of passive elements. It has advantages.

The deflection magnetic field, automatic concentration, etc. have been explained above, but in any case, it is necessary for the beam receiving tube device to have concentration characteristics that do not interfere with practical use, and the diameter of the virtual electron beam consisting of three electron beams is usually about approx. 10~16φ and black and white tube 2~3φ
As a result, it is impossible to significantly reduce raster distortion and substantially eliminate the need for a correction circuit.

That is, in the case of a black-and-white tube device, there is no concept of concentration characteristics, so for example, as shown in FIG. However, in the case of color picture tube devices, raster distortion cannot be easily reduced when considering the concentration characteristics as mentioned above, and there have been no examples of practical use to date. It would be very effective if raster distortion could be significantly reduced in a concentrated type inline color picture tube device and the need for a distortion correction circuit could be substantially eliminated.

Although the above explanation mainly concerned left and right raster distortion, in the case of an automatic concentration type inline type color picture tube device, the horizontal deflection magnetic field is essentially small because the horizontal deflection magnetic field is generally bottle cushion shaped, and 110 ° Even in tubes 2-3
It is about %.

In the figure, 21 indicates a horizontal saddle type deflection coil.

The present invention was invented in view of the above, and provides an automatic concentration type in-line type color picture tube device that greatly reduces raster distortion to virtually zero and eliminates the need for circuit correction. By using a permanent magnet as an auxiliary deflection element and superimposing the non-uniform magnetic fields, it was possible to significantly reduce the raster distortion of color picture tube devices, which was impossible with the deflection yoke itself. This invention relates to an in-line color picture tube device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an in-line color picture tube device according to the present invention will be described below with reference to the drawings.

FIG. 12 shows a deflection device adapted to an embodiment of the in-line color picture tube device of the present invention. This deflection device consists of a deflection yoke 22 and an auxiliary deflection element 23. Two pairs of permanent magnets are disposed near the ends in areas corresponding to approximately the horizontal and vertical axes of the collar receiving device.

The magnetic field of the deflection yoke produces negative isotropic astigmatism when deflecting the 30 electron beam along the horizontal axis, and positive isotropic astigmatism when deflecting it along the vertical axis, as shown in Figure 13. directional astigmatism, with the result that the electron beam is substantially overconcentrated 34 along the horizontal axis, underconcentrated 35 to a substantial point along the vertical axis, and further along the diagonal axis. is in a non-concentrated state 36, and the auxiliary deflection element 23 acts to increase the deflection sensitivity near the horizontal axis of the raster formed by the deflection yoke 22, and acts to increase the deflection sensitivity when deflected along the vertical axis. , further acting to mask positive isotropic astigmatism when the electron beam is deflected along the horizontal axis of the in-line color picture tube device;
It is arranged so that it acts to give negative isotropic astigmatism when deflected in the vertical axis direction, and at this time acts so as to substantially eliminate astigmatism along the diagonal axis, and as a result, the deflection It is arranged so as to correct the substantial deconcentration caused by the yoke magnetic field, and in this way, the raster distortion of the in-line color picture tube device is greatly reduced, and the three electron beams are concentrated on the phosphor screen. made possible.

FIG. 14 shows the magnetic field distribution of a deflection device adapted to the in-line color picture tube device of the present invention, which is combined as described above.

Similar to FIG. 4, FIG. 14 shows the magnetic field distribution in a cross section perpendicular to the tube axis Z-axis of an in-line color picture tube device. In the figure, G-σ, H-H', I-I'... A-A
', B-B'.

Corresponding to C-C'-, respectively, and a in FIG.
-d correspond to a to d in FIG. 5, respectively.

From the figure, the magnetic field that deflects the electron beam along the horizontal axis is a bottle cushion magnetic field 27 in the magnetic field G-α near the horizontal axis, and the bottle cushion magnetic field becomes stronger as it goes to the periphery 28. In the magnetic field H-H' in the region, the pincushion magnetic field is 2γ near the center axis, and the barrel magnetic field is 29 in the region corresponding to the diagonal axis, in other words, the magnetic tolerance strength distribution has an inflection point 30. , the magnetic field deflected along the vertical axis is, in the vicinity of the vertical axis J-J',
Barrel magnetic field 31 near the tube axis Z axis, bottle cushion magnetic field 32 around the vertical axis, and magnetic field in the area away from the vertical axis -
In '2', the entire barrel magnetic field 33 is formed.

In the in-line color picture tube device of the present invention equipped with the deflection device as described above, scanning raster distortion is significantly reduced to virtually zero, and three electron beams are concentrated on the phosphor screen. becomes possible.

The invention has other advantages as described below.

First, the use of, for example, a permanent magnet as the auxiliary deflection element substantially eliminates the undesired turn-end effect of saddle-shaped coils, which is commonly used in horizontal coils, etc., and as a result the magnetic field distribution of any given amount can be Can be formed.

Second, the deflection yoke itself can be sufficiently miniaturized.

Thirdly, especially in large tubes, the convergence characteristics of the color picture tube device have a negative anisotropic astigmatism in the diagonal portion, and as a result, the convergence error tends to increase. , concentration errors can be sufficiently reduced, and as a result, the concentration characteristics can be maintained at high quality.

It has the following advantages. As described above, the present invention provides an in-line color picture tube device that is equipped with a deflection yoke and a plurality of correction deflection elements as a deflection device, and substantially corrects a part of the magnetic field generated by the deflection yoke. By making the magnetic field itself a special Asteig magnetic field, the aim is to substantially reduce the scanning raster to zero and to obtain an automatically concentrating color picture tube device, and in terms of form, it is a distortion correction magnet that is applied to black and white tube devices. However, the virtual electron beam diameter formed by the three electron beams of a color picture tube is completely different from that of a black-and-white picture tube, and the other advantages mentioned above arise incidentally. Considering that, the difference in action and effect is
I think it's understandable enough.

Further, although the above embodiment has been explained only for a self-concentrating color tube, it goes without saying that the present invention can be similarly applied to other three-electron gun type color tubes.

Furthermore, as described above, the auxiliary deflection elements are arranged at positions corresponding to the X and Y axes of the color picture tube, but depending on the size and deflection angle of the picture tube, at least one of the auxiliary deflection elements may not be necessary. In that case, the unnecessary element may be omitted.

Furthermore, in other cases, it may be necessary for the diagonal axis, and in this case, it may be attached near the diagonal axis.

The method of arranging the permanent magnets depends on the deflection angle, front size, etc. of the color picture tube, as described above, and should be selected from various methods.

Although the above embodiment uses a permanent magnet as the auxiliary deflection element, it is clear from the spirit of the present invention that other auxiliary deflection elements having the same effect as the permanent magnet may be used.

For example, by attaching a high magnetic permeability member near the end of the deflection yoke on the phosphor screen side, the magnetic field generated by an electromagnetic field generator instead of a permanent magnet can produce the same effect as the above-mentioned permanent magnet. It is possible.

As described above, the present invention provides a completely new automatic concentrating collar tube, and its industrial value is extremely significant.

[Brief explanation of drawings]

FIG. 1 is a simplified sectional view showing a typical example of an in-line color picture tube device, FIG. 2 is a simplified explanatory diagram for explaining the electron beam concentration error in the picture tube device shown in FIG. 1, and FIG. The figures are an explanatory diagram of the pattern shape on the phosphor screen due to the concentration error shown in Fig. 2, Fig. 4 is an explanatory diagram showing the magnetic field distribution of the deflection device used in a conventional in-line color picture tube device, and Fig. 5 is a curve diagram showing the magnetic field distribution on a plane perpendicular to the tube axis of the deflection device in Figure 4, Figure 6 is an explanatory diagram showing the pattern shape when the horizontal and vertical magnetic fields are uniform, and Figure 7 is a diagram showing the pattern shape when the horizontal and vertical magnetic fields are uniform. An explanatory diagram showing the pattern shape when only the horizontal magnetic field is shaped like a bottle cushion; FIG. 8 is an explanatory diagram showing the magnetic field distribution when the magnetic field distributions on the electron gun side and the phosphor screen side of the deflection yoke are of opposite polarity;
Figure 9 is an explanatory diagram showing the raster shape when the deflection yoke of Figure 8 is used, Figure 10 is an explanatory diagram showing an example of the magnetic field distribution of the deflection yoke when a field controller is used, and Figure 11 is black and white. FIG. 12 is a plan view showing an example of a deflection device in a tube device; FIG. 12 is a plan view of a deflection device adapted to an embodiment of the in-line color picture tube device of the present invention; FIG.
The figure is an explanatory diagram showing the pattern shape on the phosphor screen only by the deflection yoke of the deflection device in Fig. 12, and Fig.
2 is an explanatory diagram showing the magnetic field distribution of the deflection device, and FIG. 15 is a curve diagram showing the magnetic field distribution on a plane perpendicular to the tube axis of the deflection device of FIG. 14. 21...Horizontal deflection coil 20°23...Auxiliary deflection element.

Claims (1)

[Claims] 1. A rectangular phosphor screen whose rectangular coordinate axes are the Z-axis, Y-axis, and Z-axis, and whose long sides and short sides are substantially parallel to the Z-axis and Y-axis, respectively, and a color image that strikes the phosphor screen. an in-line color picture tube incorporating in-line electron guns arranged in a row along the Z-axis to reproduce the above-mentioned in-line electron guns; When the electron beam is deflected along the Z axis, negative isotropic astigmatism is imparted, and when the electron beam is deflected along the Y axis, positive isotropic astigmatism is imparted, and substantially the Z a deflection yoke that brings the electron beam into an over-focusing state along the axis and an under-concentration state along the Y-axis; An in-line color type color picture tube device comprising an auxiliary deflection element that acts to give positive isotropic astigmatism in the X-axis direction and negative isotropic astigmatism in the X-axis direction.